Office furniture abstract
A lock arrangement is provided for office furniture units, such
as desks, credenzas and the like, that include one or more pedestals
defining at least one closable compartment in the nature of a drawer,
a cabinet, et cetera, having a mechanism to lock the compartment
closed, and a top extending the length of the unit. The lock arrangement
is particularly adapted for in-top installations, and comprises
a primary lock mounted in the top, and a channel which opens downwardly
from the lower surface of the top adjacent the forward edge thereof.
A connector device is mounted within the channel, and mechanically
interconnects the primary lock with the compartment lock mechanism,
such that manipulation of the primary lock locks and unlocks the
compartment. A removable cover assembly encloses the channel, and
preferably comprises two covers which are positioned over opposite
ends of the channel. The end covers have oppositely oriented slide
latches, whereby longitudinal divergence of the end covers detachably
fastens the same to the channel. A third cover is inserted between
the interior ends of the end covers to enclose the medial portion
of the channel and prevent convergence of the end covers from the
locked position. A lock mechanism retains the center cover in the
locked position, and is preferably connected with the primary lock,
such that shifting the primary lock also locks and unlocks the center
cover to permit only authorized access to the lock arrangement.
Office furniture claims
The embodiments of the invention in which an exclusive property
or privilege is claimed are defined as follows:
1. A lock arrangement for office furniture units such as desks,
credenzas and the like, that include one or more pedestals defining
at least one closable compartment, such as a drawer, a cabinet or
the like, with means for locking said compartment closed, and a
top extending the length of said unit, said lock arrangement comprising:
a primary lock mounted in said unit adjacent said top, and having
locked and unlocked positions;
a channel opening downwardly from a lower surface of said top;
said primary lock having a portion thereof communicated with the
interior of said channel;
means for mechanically connecting said primary lock with said compartment
locking means, whereby shifting said primary lock between the locked
and unlocked positions locks and unlocks said compartment; said
connecting means being positioned within said channel;
a removable cover assembly having a three-piece construction, comprising:
first and second covers shaped to enclose opposite ends of said
channel;
first slide latch means connected with said first and second covers;
second slide latch means connected with said channel, and mating
with said first slide latch means, whereby said first and second
covers are positioned over the opposite ends of said channel and
diverged longitudinally into a locked position, wherein said first
and second slide latch means are engaged and prevent downward removal
of said first and second covers from said channel;
a third cover shaped to enclose a medial portion of said channel;
said third cover being shaped to be vertically inserted between
and abut adjacent interior ends of said first and second covers
to prevent longitudinal convergence of said first and second covers
from the locked position; and
means for locking said third cover in place between said first
and second covers to permit only authorized access to said locking
arrangement.
2. A lock arrangement as set forth in claim 1 wherein:
said primary lock is mounted within said top to define an in-top
lock arrangement.
3. A lock arrangement as set forth in claim 2 wherein:
said primary lock is positioned adjacent to the medial portion
of said channel, whereby removal of said third cover provides direct
access to said primary lock.
4. A lock arrangement as set forth in claim 3 wherein:
said primary lock is detachably connected with said top by fasteners
which are accessible only through said channel.
5. A lock arrangement as set forth in claim 4 wherein:
said channel is sufficiently wide to permit said primary lock to
be easily removed and replaced therethrough.
6. A lock arrangement as set forth in claim 5 including:
means for connecting said primary lock with said third cover locking
means, whereby shifting said primary lock between the locked and
unlocked positions automatically locks and unlocks said third cover.
7. A lock arrangement as set forth in claim 6 wherein said third
cover locking means further includes:
third slide latch means connected with said third cover;
fourth slide latch means connected with the interior ends of said
first and second covers, whereby fore-to-aft translation of said
third cover engages said third and fourth slide latch means into
a locked position to prevent downward removal of said third cover;
and
means for selectively retaining said third cover member in the
locked position.
8. A lock arrangement as set forth in claim 7 wherein:
said primary lock comprises a key lock having a tumbler cylinder
which is rotated between the locked and unlocked positions.
9. A lock arrangement as set forth in claim 8 wherein:
said mechanical connecting means includes first and second lock
slides slidably mounted on an interior side of said first and second
covers respectively, and means for connecting said lock slides with
said tumbler cylinder, whereby rotation of said tumbler cylinder
reciprocates said lock slides.
10. A lock arrangement as set forth in claim 9 wherein:
one of said lock slides defines at least a portion of said third
cover retaining means.
11. A lock arrangement as set forth in claim 10 wherein said third
cover retaining means further includes:
a tab upstanding from a forward portion of said third cover, and
positioned to abut an interior end of said one lock slide in the
locked position to prevent fore-to-aft translation of said third
cover in the direction of third cover removal.
12. A lock arrangement as set forth in claim 11 wherein:
said lock slide connecting means comprises a link interconnecting
the interior ends of said lock slides.
13. A lock arrangement as set forth in claim 12 including:
means for detachably connecting said link with said lock slides
to facilitate removal and replacement of said primary lock.
14. A lock arrangement as set forth in claim 13 wherein said lock
slide connecting means further comprises:
a cam arm detachably attached to and rotating with said tumbler
cylinder;
an actuator arm having a first end pivotally connected with said
crank arm at a first pivot point, and a second end pivotally connected
with said link at a second pivot point, whereby rotation of said
tumbler cylinder reciprocates said lock slides.
15. A lock arrangement as set forth in claim 14 wherein:
said first and second pivot points assume an overcentered relationship
with respect to the axis of rotation of said tumbler cylinder in
the locked position, whereby external forces applied to said lock
slides in a direction to force said lock arrangement unlocked, rotatably
urge said tumbler cylinder further toward the locked position.
16. A lock arrangement as set forth in claim 15 wherein:
said compartment locking means includes an upstanding actuator
rod shaped to engage one of said lock slides at multiple positions
therealong.
17. A lock arrangement as set forth in claim 16 wherein:
said channel has a generally inverted U-shape, defined by a top,
depending parallel sidewalls, and end walls along the lower edges
of said sidewalls.
18. A lock arrangement as set forth in claim 17 wherein said first
slide latch means for said first and second covers comprises:
a plurality of hook-shaped hangers disposed along both sides of
said first and second covers; said hangers having prongs which are
mutually parallel, extend in the longitudinal direction of said
first and second covers, and have free ends oriented toward exterior
ends of said first and second covers.
19. A lock arrangement as set forth in claim 18 wherein said second
slide latch means for said first and second covers comprises:
a plurality of slots disposed in the end walls of said channel,
and positioned for closely receiving said hangers prongs therethrough.
20. A lock arrangement as set forth in claim 19 wherein:
said first and second covers have a generally U-shape, defined
by a base with a lower surface and upstanding parallel sidewalls.
21. A lock arrangement as set forth in claim 20 wherein:
said hanger prongs are positioned laterally outwardly of said cover
sidewalls, and have lower abutment surfaces disposed slightly above
the base of said first and second covers, whereby in the locked
position, the lower surfaces of said first and second covers are
substantially flush with the end walls of said channels.
22. A lock arrangement as set forth in claim 21 wherein said third
slide latch means for said third cover includes:
at least two hook-shaped hangers disposed adjacent opposite sides
of said third cover at a rearward portion thereof; said hangers
having prongs which are mutually parallel, extend in the longitudinal
direction of said third cover, and have free ends oriented toward
a forward portion of said third cover.
23. A lock arrangement as set forth in claim 22 wherein said fourth
slide latch means for said third cover includes:
mating slots in the interior ends of said first and second covers,
extending in the fore-to-aft direction, and positioned for closely
receiving said third cover members hanger prongs therethrough.
24. A lock arrangement as set forth in claim 23 wherein said third
slide latch means for said third cover further includes:
a front wall upstanding from a forward end of said third cover
member, and including free ends which extend outwardly of an adjacent
base portion of said third cover member.
25. A lock arrangement as set forth in claim 24 wherein said fourth
slide latch means for said third cover further includes:
first and second slots disposed through the base of said first
and second covers adjacent a forward one of said cover member sidewalls;
said first and second slots extending in the longitudinal direction
of said first and second covers, and being shaped to receive the
free ends of the front wall of said third cover therethrough, whereby
forward translation of said third cover locks the same onto said
first and second cover members.
26. A lock arrangement as set forth in claim 25 wherein:
said forward sidewalls of said first and second cover members include
an inverted L-shaped flange disposed adjacent said first and second
slots, in which the free ends of said third cover front wall are
captured in the locked position.
27. A lock arrangement as set forth in claim 26 wherein:
said third cover includes a recessed channel extending transversely
across the base thereof in which the interior ends of said lock
slides reciprocate.
28. A lock arrangement as set forth in claim 27 wherein:
said interior ends of said first and second covers include inwardly
facing L-shaped flanges, having horizontal legs in which said first
and second slots are disposed.
29. A lock arrangement as set forth in claim 28 wherein:
said third cover includes a rear wall upstanding from a rearward
edge of said third cover base, with slots extending through opposite
sides of said rearward edge to define opposite free ends of said
rear wall, whereby in the locked position, said rear wall free ends
are supported on said inwardly facing, L-shaped flanges.
30. A lock arrangement as set forth in claim 29 including:
at least once fastener extending through the base of said third
cover, and detachably connecting the same with one of said first
and second covers.
31. A lock arrangement as set forth in claim 30 wherein:
said primary lock fasteners are screws which can be installed and
removed only through said channel.
32. A lock arrangement as set forth in claim 31 wherein:
said channel has a width slightly larger than the length of said
primary lock to facilitate removal and replacement of said primary
lock.
33. A lock arrangement as set forth in claim 32 wherein:
said tab on said third cover extends upwardly from a side edge
of said third cover base, between the channel and the front wall
of said third cover.
34. A lock arrangement as set forth in claim 33 wherein:
said first and second cover bases include at least two pierced,
inverted L-shaped flanges, positioned mutually in-line, and facing
the forward sidewalls of said first and second covers; and
said forward sidewalls of said first and second covers include
pierced, inwardly projecting protrusions, which in conjunction with
said flanges, form guides in which said lock slides reciprocate.
35. A lock arrangement as set forth in claim 34 wherein:
said office furniture unit includes a center drawer; and including
a center drawer lock arrangement comprising:
a lock rod rotatably mounted on the lower surface of said top,
and having forward and rearward ends; said forward end being laterally
offset from the longitudinal axis of said lock rod to form a crank;
said rearward end of said rod being L-shaped, and selectively engaging
a mating portion of said center drawer to lock said center drawer
closed;
a lock rod actuator connected to and reciprocating with said lock
slides;
means for pivotally connecting the forward end of said lock rod
with said actuator, whereby shifting said primary lock between the
locked and unlocked positions engages and disengages the rearward
end of said actuator rod with said center drawer to lock and unlock
said center drawer.
36. A lock arrangement as set forth in claim 35 including:
an alternate cover for said center drawer lock arrangement, which
replaces said third cover, and includes removable fasteners which
attach said alternate cover to said top, and position said alternate
cover within the confines of said center drawer when it is closed,
whereby in the locked position, said center drawer permits only
authorized access to said locking arrangement.
37. A lock arrangement as set forth in claim 36 wherein:
said alternate cover includes a transverse channel in which said
actuator reciprocates.
38. A lock arrangement as set forth in claim 37 wherein:
said cover includes a rearwardly extending channel in which a forward
portion of said actuator rod is rotatably supported.
39. A lock arrangement as set forth in claim 38 including:
a bracket mounted on and depending from the lower surface of said
top, and rotatably supporting a rearward portion of said actuator
rod.
40. A lock arrangment as set forth in claim 1 wherein:
said primary lock is positioned adjacent to the medial portion
of said channel, whereby removal of said third cover provides direct
access to said primary lock.
41. A lock arrangement as set forth in claim 1 wherein:
said primary lock is detachably connected with said top by fasteners
which are accessible only through said channel.
42. A lock arrangement as set forth in claim 1 wherein:
said channel is sufficiently wide to permit said primary lock to
be removed and replaced from said unit through said channel.
43. A lock arrangement as set forth in claim 1 wherein:
means for connecting said primary lock with said third cover locking
means, whereby shifting said primary lock between the locked and
unlocked positions automatically locks and unlocks said third cover.
44. A lock arrangement as set forth in claim 1 wherein said third
cover locking means comprises:
third slide latch means connected with said third cover;
fourth slide latch means connected with interior ends of said first
and second covers whereby fore-to-aft translation of said third
cover engages said third and fourth slide latch means into a locked
position to prevent downward removal of said third cover; and
means for selectively retaining said third cover in the locked
position.
45. A lock arrangement as set forth in claim 1 wherein:
said primary lock comprises a key lock, having a tumbler cylinder
which is rotated between the locked and unlocked positions.
46. A lock arrangement as set forth in claim 45 wherein:
said mechanical connecting means includes at least one lock slide
slidably mounted in said channel, and means for connecting said
lock slide with said tumbler cylinder, whereby rotation of said
tumbler cylinder reciprocates said lock slide.
47. A lock arrangement as set forth in claim 46 wherein:
said lock slide defines a portion of said third cover retaining
means, whereby reciprocation of said lock slide automatically locks
and unlocks said third cover.
48. A lock arrangement as set forth in claim 47 wherein said third
cover retaining means further includes:
a tab upstanding from a forward portion of said third cover, and
positioned to abut a mating portion of said lock slide in the locked
position to prevent fore-to-aft translation of said third cover
member in the direction of third cover removal.
49. A lock arrangement as set forth in claim 1 wherein:
said top is hollow, and includes an upper, rigid support sheet
which is reverse bent along a forward edge thereof to define a front
edge of said top.
50. A lock arrangement as set forth in claim 49 wherein:
said channel is defined between first and second generally U-shaped
channels, which are positioned adjacent the front edge of said top,
spaced laterally apart, extend mutually parallel, and are attached
to a lower surface of said support sheet, thereby reinforcing said
top.
51. A lock arrangement as set forth in claim 1 wherein:
said channel has a generally inverted U-shape, defined by a top,
depending parallel sidewalls, and end walls along the lower edges
of said sidewalls.
52. A lock arrangement as set forth in claim 51 wherein said first
slide latch means for said first and second covers comprises:
a plurality of hook-shaped hangers disposed along both sides of
said first and second covers; said hangers having prongs which are
mutually parallel, extend in the longitudinal direction of said
first and second covers, and have free ends oriented toward exterior
ends of said first and second covers.
53. A lock arrangement as set forth in claim 52 wherein said second
slide latch means for said first and second covers comprises:
a plurality of slots disposed in the end walls of said channel,
and positioned for closely receiving said hanger prongs therethrough.
54. A lock arrangement as set forth in claim 1 wherein:
said first and second covers have a generally U-shape, which is
defined by a base with a lower surface, and upstanding parallel
sidewalls.
55. A lock arrangement as set forth in claim 1 wherein said third
cover locking means includes:
at least two hook-shaped hangers disposed adjacent opposite sides
of said third cover at a rearward portion thereof; said hangers
having prongs which are mutually parallel, extend in the longitudinal
direction of said third cover, and have free ends oriented toward
a forward portion of said third cover.
56. A lock arrangement as set forth in claim 55 wherein said third
cover locking means further includes:
mating slots in interior ends of said first and second covers,
which extend in a fore-to-aft direction, and are positioned for
closely receiving said third cover hanger prongs therethrough.
57. A lock arrangement as set forth in claim 1 wherein:
said office furniture unit includes a center drawer; and including
a center drawer lock arrangement comprising:
a lock rod rotatably mounted on the lower surface of said top,
and having forward and rearward ends; said forward end being laterally
offset from the longitudinal axis of said lock rod to form a crank;
said rearward end of said rod being L-shaped, and selectively engaging
a mating portion of said center drawer to lock said center drawer
closed;
a lock rod actuator connected to and reciprocating with said mechanical
connecting means;
means for pivotally connecting the forward end of said lock rod
with said actuator, whereby shifting said primary lock between the
locked and unlocked positions engages and disengages the rearward
end of said actuator rod with said center drawer to lock and unlock
said center drawer.
58. A lock arrangement as set forth in claim 57 including:
an alternate cover for said center drawer lock arrangement, which
replaces said third cover and includes removable fasteners which
attach said alternate cover to said top, and position said alternate
cover within the confines of said center drawer when it is closed,
whereby in the locked position, said center drawer permits only
authorized access to said locking arrangement.
59. A lock arrangement as set forth in claim 58 wherein:
said alternate cover includes a transverse channel in which said
actuator reciprocates.
60. A lock arrangement as set forth in claim 58 wherein:
said cover includes a rearwardly extending channel in which a forward
portion of said actuator rod is rotatably supported.
61. A lock arrangement as set forth in claim 58 including:
a bracket mounted on and depending from the lower surface of said
top, and rotatably supporting a rearward portion of said actuator
rod.
62. A lock arrangement for office furniture units such as desks,
credenzas and the like, that include at least one closable compartment
therein, such as a drawer, a cabinet, or the like, with means for
locking said compartment closed, and a top extending the length
of said unit, said lock arrangement comprising:
a removable primary lock positioned within said top to define an
in-top lock arrangement, and having locked and unlocked positions;
a channel opening downwardly from a lower surface of said top;
said channel being shaped to permit said primary lock to be removed
and replaced from said unit through said channel;
means for detachably connecting said primary lock with said top
by fasteners which are accessible only through said channel;
means for mechanically connecting said primary lock with said compartment
locking means, whereby shifting said primary lock between the locked
and unlocked positions locks and unlocks said compartment; said
connecting means being positioned within said channel;
a removable cover shaped to enclose said channel and prevent unauthorized
access thereto;
means for selectively locking said cover over said channel in a
closed position; said cover locking means being positioned wholly
within said channel for security;
means for operably connecting said cover locking means with said
primary lock, whereby shifting said primary lock between the locked
and unlocked positions automatically locks and unlocks said cover,
thereby permitting only authorized access to said locking arrangement
and said removable primary lock.
63. A lock arrangement as set forth in claim 62 wherein:
said primary lock comprises a key lock, having a tumbler cylinder
rotatable between open and closed positions.
64. A lock arrangement as set forth in claim 63 wherein:
said mechanical connecting means includes at least one lock slide
slidably mounted in said channel, and means for connecting said
lock slide with said tumbler cylinder, whereby rotation of said
tumbler cylinder reciprocates said lock slide.
65. A lock arrangement as set forth in claim 64 wherein said lock
slide connecting means further comprises:
a cam arm detachably attached to and rotating with said tumbler
cylinder;
an actuator arm having a first end pivotally connected with said
crank arm at a first pivot point, and a second end pivotally connected
with said lock slide at a second pivot point, whereby rotation of
said tumbler cylinder reciprocates said lock slide.
66. A lock arrangement as set forth in claim 65 wherein:
said first and second pivot points assume an over-centered relationship
with respect to the axis of rotation of said tumbler cylinder in
the locked position, whereby external forces applied to said lock
slide in a direction to force said lock arrangement unlocked, rotably
urge said tumbler cylinder further toward the locked position.
67. A lock arrangement as set forth in claim 62 wherein:
said channel includes opposite ends, with first and second channel
portions defined therebetween.
68. A lock arrangement as set forth in claim 67 wherein said removable
cover has a multiple-piece construction comprising:
a first cover shaped to enclose the first portion of said channel;
first slide latch means connected with said first cover;
second slide latch means connected with the first portion of said
channel, and mating with said first slide latch means, whereby said
first cover is positioned over the first portion of said channel
and translated longitudinally toward one of the channel ends into
a locked position, wherein said first and second slide latch means
are engaged and prevent downward removal of said first cover from
said channel;
a second cover shaped to enclose the second portion of said channel;
said second cover being shaped to be vertically inserted between
and abut an interior end of said first cover and the other end of
said channel to prevent longitudinal translation of said first cover
from the locked position; and wherein
said cover locking means selectively retains said second cover
between said first cover and the other end of said channel.
69. A lock arrangement as set forth in claim 68 wherein:
said second cover is positioned adjacent to said primary lock,
whereby removal of said second cover provides direct access to said
primary lock.
70. A lock arrangement as set forth in claim 69 wherein said second
cover locking means further includes:
third slide latch means connected with said second cover member;
fourth slide latch means connected with the second portion of said
channel, and mating with said third slide latch means, whereby fore-to-aft
translation of said second cover engages the third and fourth slide
latch means into a locked position, and prevents downward removal
of said second cover; and
means for selectively retaining said second cover in the locked
position.
71. A lock arrangement as set forth in claim 70 wherein:
said mechanical connecting means includes at least one lock slide
slidably mounted in said channel, and means for connecting said
lock slide with said tumbler cylinder, whereby rotation of said
tumbler cylinder reciprocates said lock slide.
72. A lock arrangement as set forth in claim 71 wherein:
said second cover member includes a stop on an interior side thereon
shaped for mating engagement with a mating portion of said lock
slide, whereby shifting said primary lock into the locked position
engaged said lock slide with said stop to retain said second cover
member in the locked position.
73. A lock arrangement as set forth in claim 72 wherein:
said first slide latch means comprises a plurality of hook-shaped
hangers disposed along both sides of said first cover; said hangers
having prongs which are mutually parallel, extend in the longitudinal
direction of said first cover, and have free ends oriented toward
the one end of said channel; and
said second slide latch means comprises a plurality of slots disposed
in end walls of said channel, and positioned for closely receiving
said hanger prongs therethrough.
74. A lock arrangement as set forth in claim 73 wherein:
said third slide latch means includes at least two hook-shaped
hangers disposed adjacent opposite sides of said second cover at
a rearward portion thereof; said hangers having prongs which are
mutually parallel, extend in the longitudinal direction of said
second cover, and have free ends oriented toward a forward portion
of said second cover; and
said fourth slide latch means includes mating slots in interior
ends of said first cover and said other channel end, extending in
the fore-to-aft direction, and positioned for closely receiving
said second cover hanger prongs therethrough.
75. A lock arrangement for office furniture units such as desks,
credenzas, and the like, that include at least one closable compartment,
such as a drawer, a cabinet or the like, with means for locking
said compartment closed, and a top extending the length of said
unit, said lock arrangement comprising:
a primary lock mounted in said unit adjacent said top, and having
locked and unlocked positions;
a channel opening downwardly from a lower surface of said top,
with opposite ends thereof defined by end walls; said primary lock
having a portion thereof communicated with the interior of said
channel;
means for mechanically connecting said primary lock with said compartment
locking means, whereby shifting said primary lock between the locked
and unlocked positions locks and unlocks sid compartment; said connecting
means being positioned within said channel;
a removable cover assembly having at least a two-piece construction,
comprising:
a first cover shaped to enclose one end of said channel;
first slide latch means connected with said first cover;
second slide latch means connected with said channel, and mating
with said first slide latch means, whereby said first cover is positioned
over the one end of said channel and translated longitudinally into
a locked position, wherein said first and second slide latch means
are engaged and prevent downward removal of said first cover from
said channel;
a second cover shaped to enclose the other end of said channel;
said second cover being shaped to be vertically inserted between
and abut the interior end of said first cover and the adjacent end
wall of said channel to prevent longitudinal translation of said
first cover from the locked position; and
means for locking said second cover in place between said first
cover and the adjacent end wall of said channel to permit only authorized
access to said locking arrangement.
Office furniture description
CROSS REFERENCE TO RELATED APPLICATIONS
The present application is related to my copending, U.S. patent
application Ser. No. 362452 filed, Mar. 26 1982 entitled OVER-CENTERED
LOCK ARRANGEMENT FOR OFFICE FURNITURE UNITS, which is hereby incorporated
by reference.
BACKGROUND OF THE INVENTION
The present invention relates to office furniture units, such as
desks, credenzas and the like, in particular to an improved lock
arrangement therefor.
Lock arrangements for desks, credenzas and other similar office
furniture units and/or work stations are generally known in the
art. Some lock arrangements, of the type disclosed in U.S. Pat.
No. 3123417 are mounted in the center drawer of the furniture
unit. Locks have also been mounted in the front of the unit, directly
below the top, as disclosed in U.S. Pat. No. 3521937. Concealed
lock arrangements, such as those disclosed in U.S. Pat. Nos. 3385642;
4057307 and 3360318 are mounted within the top of the unit to
provide a compact, low-profile structure, and are referred to herein
as "in-top" locks.
Heretofore, in-top locks, and other similar lock arrangements for
office furniture units have been rather difficult to access, such
as for repairing or replacing worn or broken parts. For example,
in my prior in-top lock arrangement, as disclosed in U.S. Pat. No.
4057307 a one-piece cover encloses the primary lock and link
members. Removable fasteners secure the cover to the bottom surface
of the top. The fasteners are positioned directly above the pedestals,
to prevent tampering. However, in the event that the work station
does not call for two pedestals underneath the top, at least some
of the cover fasteners are exposed. Further, to access the lock
area, the top of the desk or credenza must be removed from the pedestals,
and disassembled. This is a rather difficult, time consuming task,
which requires a relatively skilled mechanic, and involves somewhat
heavy lifting.
In large office furniture systems, it is quite beneficial to provide
lock arrangements which can be easily removed and replaced. This
feature not only facilitates repair and maintenance of the furniture
units, but is particularly important in "rekeying" to
maintaining proper office security. Changing personnel and duties,
as well as office reorganization, demand that the furniture locks
be changed rather frequently, particularly in those areas of the
office system in which confidential and/or sensitive materials are
kept. The practice of changing individual lock tumblers and mating
keys is very complicated and costly, and requires the services of
a skilled locksmith.
Prior lock arrangements have also been somewhat susceptible to
tampering and/or surreptitious entry. In those lock systems which
operate with a fore-to-aft locking motion, considerble leverage
can be applied to the lock by a screwdriver, or other similar tool,
in an attempt to gain entry to the furniture unit. Although lock
systems which operate with a side-to-side locking motion are generally
considered to be more secure, prying forces which are applied to
the lock assembly often result in substantial damage to the lock.
SUMMARY OF THE INVENTION
One aspect of the present invention is an improved, removable cover
assembly, which is particularly adapted for in-top locks, and other
similar lock arrangements. The cover assembly comprises two covers
positioned over opposite ends of a lock channel, with oppositely
oriented slide latches, whereby longitudinal divergence of the end
covers detachably fastens the same to the channel. A third cover
is inserted between the interior ends of the end covers to enclose
a medial portion of the channel, and prevent convergence of the
end covers toward the unlocked position. An internally mounted lock
mechanism retains the center cover in place in the locked position,
and is selectively unlocked to permit only authorized access to
the lock arrangement. Preferably, the primary lock is detachably
mounted to the top by fasteners which are accessible only through
the channel, and the center cover is disposed directly below the
center lock, whereby the primary lock can be easily removed and
replaced by relatively unskilled personnel to change the lock for
either repair or security reasons.
Another aspect of the present invention is a lock arrangement having
a channel access opening, and mating cover to remove and replace
the primary lock. A cover lock attaches the cover to the channel
to prvent surreptitious entry, and is operably connected with the
primary lock, such that shifting the primary lock also locks and
unlocks the cover to permit only authorized access to the lock arrangement.
In those embodiments in which the lock comprises a key lock, only
those persons having a key can accesss the lock arrangement.
Yet another aspect of the present invention is a center drawer
adapter, having an actuator arm attached to the primary lock, so
that shifting the primary lock between the locked and unlocked positions
also locks and unlocks the center drawer.
The principal objects of the present invention are to provide a
lock arrangement having a removable cover assembly which provides
easy access to the internally mounted parts of the lock assembly.
The cover assembly is particularly designed for in-top locks, and
other similar lock arrangements, and preferably comprises a three-piece
assembly, having a center cover disposed directly below the primary
lock to access the same without detaching the pedestals. The primary
lock is detachably mounted in the top, so that it can be easily
removed and replaced by even relatively unskilled personnel when
required for repair and/or security purposes. The primary lock is
operably connected with the pedestal locks and the cover lock, such
that manipulation of the primary lock automatically locks and unlocks
both the compartments and the center cover. The locking cover arrangement
greatly alleviates the hazard of surreptitious entry, yet provides
easy access to authorized personnel. The lock arrangement has a
very compact, lightweight construction which is quite durable. The
top has a very sturdy construction, provides ample room to house
an in-top lock arrangment, and requires less material to manufacture.
The lock arrangement is efficient in use, economical to manufacture,
capable of a long operating life, and particularly well adapted
for the proposed use.
These and other features, advantages and objects of the present
invention will be further understood and appreciated by those skilled
in the art by reference to the following written specification,
claims and appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front elevational view of an office furniture unit
having a lock arrangement mounted therein embodying the present
invention.
FIG. 2 is a fragmentary, perspective view of a pedestal for the
office furniture unit.
FIG. 3 is an exploded, perspective view of another pedestal for
the office furniture unit.
FIG. 4 is an exploded, perspective view of the lock arrangement.
FIG. 5 is a fragmentary, horizontal cross-sectional view of the
top of the office furniture unit, particularly showing the lock
arrangement, with a center cover removed, and portions of the lock
broken away.
FIG. 6 is a fragmentary, vertical cross-sectional view of the lock
arrangement.
FIG. 7 is a fragmentary, perspective view of the lock arrangement,
taken from a lower side thereof, and showing the center cover in
a disassembled condition.
FIG. 8 is a fragmentary, horizontal cross-sectional view of the
lock arrangement, with the center cover shown installed.
FIG. 8A is a fragmentary, vertical cross-sectional view of the
lock arrangement, taken along the line VIIIA-VIIIA of FIG. 8.
FIG. 9 is a fragmentary, perspective view of the lock arrangement,
with a lock slide link member detached therefrom.
FIG. 10 is a fragmentary, perspective view of the lock arrangement,
with the lock slide link shown attached to the primary lock.
FIG. 11 is a fragmentary, vertical cross-sectional view of the
lock arrangement, with the primary lock shown removed from the top.
FIG. 12 is a perspective view of a center drawer lock embodiment
of the present lock arrangement.
FIG. 13 is a vertical cross-sectional view of the center drawer
lock arrangement.
FIG. 14 is a fragmentary, bottom plan view of the center drawer
lock arrangement.
FIG. 15 is an exploded perspective view of an actuator rod portion
of the center drawer lock arrangement.
FIG. 16 is a fragmentary, perspective view of the actuator rod
for the center drawer lock arrangement, shown in a position to accommodate
deep work surfaces.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
For purposes of description herein, the terms "upper,"
"lower," "right," "left," "rear,"
"front," "vertical," "horizontal,"
and derivatives thereof shall relate to the invention as oriented
in FIGS. 1 4 and 5. However, it is to be understood that the invention
may assume various alternative orientations, except where expressly
specified to the contrary.
The reference numeral 1 (FIG. 1) generally designates a lock arrangement
for office furniture units 2 such as desks, credenzas and the like,
that include one or more pedestals 3 defining at least one closable
compartment 4 in the nature of a drawer, a cabinet et cetera, having
a lock mechanism 5 and a top 6 extending the length of unit 2.
Lock arrangement 1 comprises a primary lock 7 mounted in top 6
and a channel 8 (FIG. 6), which opens downwardly from the lower
surface of top 6 adjacent the forward edge 9 thereof. A connector
device 10 is mounted in channel 8 and mechanically interconnects
primary lock 7 with compartment lock 5 such that manipulation of
primary lock 7 locks and unlocks the compartment 4. A removable
cover assembly 11 (FIG. 11) encloses channel 8 and preferably comprises
first and second covers 12 and 13 which are positioned over opposite
ends of channel 8. The end covers 12 and 13 have oppositely oriented
slide latches 14 whereby longitudinal divergence of end covers
12 and 13 detachably fastens the same to channel 8. A third cover
15 is inserted between the interior ends of covers 12 and 13 to
enclose the center portion of channel 8 and prevent convergence
of end covers 12 and 13 toward the unlocked position. An internally
mounted lock mechanism 16 retains center cover 15 in the locked
position, and is preferably connected with primary lock 7 such
that shifting primary lock 7 also locks and unlocks center cover
15 to permit only authorized access to the lock arrangement.
Lock arrangement 1 is particularly adapted for use in conjunction
with in-top lock assemblies, as illustrated and described herein.
However, it is to be understood that lock arrangement 1 can be used
in other similar applications, including the below-top installation
disclosed in U.S. Pat. No. 3521937.
The illustrated furniture unit 2 (FIG. 1) comprises a desk, having
side panels 22 which support top 6 and a rear panel 23. As best
illustrated in FIGS. 6 and 11 top 6 has a hollow construction,
comprising a formed, rigid shell 24 constructed of steel or other
similar materials, which is bent rearwardly in a U-shaped fashion
along the forward edge 9 of top 6. A cover layer 25 such as vinyl,
formica, or the like, overlies shell 24 and is adhered thereto
to provide an aestheticallypleasing appearance and a suitable writing
surface. A generally U-shaped reinforcing rib or channel 26 extends
along the forward side of the interior of top 6 and includes upper
flanges 27 which are oriented rearwardly, and are fixedly attached
to the lower surface of shell 24. A trim strip 28 is attached to
the base portion 29 of reinforcing channel 26 by fasteners 30 and
covers the free edge of cover layer 25. The upstanding legs 31 of
reinforcing channel 26 are mutually parallel, and include mating
apertures 36 and 37 (FIG. 11) therethrough in which primary lock
7 is closely received. A second, U-shaped reinforcing rib or channel
32 is fixedly attached to the lower surface of shell 24 at a location
spaced rearwardly of reinforcing channel 26 and is disposed generally
parallel therewith. Reinforcing channel 32 includes oppositely oriented
flanges 33 attached to the lower surface of shell 24 a base 34
and opposite sidewalls 35. The base 29 of reinforcing channel 26
is positioned substantially co-planar with the base 34 of reinforcing
channel 32. In this example, the interior sidewalls of channels
26 and 32 in conjunction with that portion of shell 24 disposed
therebetween, define the downwardly opening channel 8 in which in-top
lock arrangement 1 is disposed. The forward edge 9 of top 6 includes
an aperture 38 aligned with channel apertures 36 and 37 in which
primary lock 7 is received and protrudes through the front of desk
2. Reinforcing channels 26 and 32 not only form lock channel 8
but they also add rigidity and strength to the hollow top construction
6. The reinforced top 6 is lightweight, and requires less material
than prior units of comparable strength.
Pedestals 3 (FIG. 1) are suspended from the lower side of top 6
at selected positions therealong. In this example, furniture unit
2 includes a single pedestal 3 mounted on the right-hand side of
desk 2. However, it is to be understood that furniture unit 2 may
include more than one pedestal, and that each pedestal 3 is suspended
from top 6 at various positions.
In the illustrated examples, pedestal 3 comprises a drawer unit,
having first and second drawers 40 and 41 slidably mounted in an
open-top housing 42. Compartment lock mechanisms 5 are manipulated
by lateral or side-to-side motion, and in the example shown in FIG.
3 comprises a rear mounted pivotal latch 43 that engages the rear
portions of drawers 40 and 41 and locks the same closed. A link
44 connects rear latch 43 with an actuator rod 45 which is mounted
in a forward bracket 46 and projects upwardly from the upper surface
of housing 42 to engage connecter 10.
In the example illustrated in FIG. 2 pedestal 3 has a front pivotal
latch 50 that selectively engages the forward portion of drawers
40 and 41 and locks the same closed. An upstanding actuator arm
51 is mounted in bracket 52 and is connected with front latch 50
by a link 53 and adjustable clip 54.
Primary lock 7 (FIG. 4) preferably comprises a key lock, having
a stationary barrel or housing 60 with a tumbler plug or cylinder
61 mounted therein for rotation between locked and unlocked positions.
Key lock housing 60 includes an apertured flange 62 at the rearward
end thereof to facilitate mounting the lock in top 6 and a collar
63 at the forward end of housing 60 to center the lock in reinforcing
rib aperture 36. A drive shaft 64 extends from the rear of housing
60 is connected with tumbler cylinder 61 and rotates therewith.
Except as noted herein, key lock 7 has an otherwise conventional
construction, and includes a plurality of tumblers (not shown) mounted
in cylinder 61 and means for positively stopping rotation of cylinder
61 at the locked and unlocked positions. The illustrated tumbler
cylinder 61 rotates 90.degree. between the locked and unlocked positions.
A key 65 (FIGS. 5 and 6) manipulates the lock tumblers (not shown)
to permit rotation of cylinder 61.
In the illustrated arrangement, key lock 7 is concealed within
the thickness of top 6 to provide a truly in-top lock construction.
Key lock 7 is preferably detachably mounted in top 6 by inserting
the forward portion of the lock through the aligned, mating apertures
37-38 in reinforcing channel 26 and forward edge 9 as illustrated
in FIG. 11. Detachable fasteners 66 (FIGS. 5 and 6), in the nature
of sheet metal screws, or the like, extend through the apertures
in the collar 63 of lock housing 60 and are closely received in
mating apertures in the rearward sidewall 31 of front reinforcing
channel 26. The overall length of key lock 7 is slightly less than
the width of channel 8 such that the key lock can be easily installed
and removed from the interior of top 6.
With reference to FIG. 4 the various parts of cover assembly 11
are interconnected so as to enclose the open side of channel 8 to
prevent unauthorized access to locking arrangement 1. Left and right-hand
end covers 12 and 13 respectively, have a substantially identical
construction, except that the various parts are oriented for left
and right-hand sides of the assembly. End covers 12 and 13 have
a generally U-shaped transverse cross-sectional shape, including
base 70 and upstanding sidewalls 71 and 72. Slide latches 14 are
mounted on opposite sides of cover members 12 and 13 and in this
example comprise a plurality of hook-shaped hangers, having aligned
prongs 73 disposed in a mutually parallel relationship, extending
in the longitudinal direction of cover member 13 and having free
ends 74 oriented toward the exterior ends of the cover members 12
and 13. A plurality of elongate, rectangular slots 75 (FIG. 5) are
positioned in the bases 29 and 34 of the forward and rearward reinforcing
channels 26 and 32 and closely receive hanger prongs 73 therethrough.
In this example, prongs 73 are pierced through the sidewalls 71
and 72 of cover members 12 and 13 and include an outwardly extending
arm 76 with prongs 73 upstanding therefrom. The prongs 73 have lower
abutment surfaces 77 which engage the upper surfaces of channel
bases 29 and 34 whereby in the mutually diverged, locked position,
the lower surfaces of covers 12 and 13 and channels 26 and 32 are
substantially co-planar or flush.
Connector mechanism 10 (FIG. 4), interconnects primary lock 7 with
the actuator arm of pedestal 3 and comprises a pair of lock slides
81 and 82 which are slidably mounted on the upper sides of covers
12 and 13 and reciprocate side-to-side as key lock 7 is rotated.
The left and right-hand lock slides, 81 and 82 respectively have
a generally U-shaped transverse cross-sectional configuration, comprising
a base 83 with upstanding sidewalls 84 and 85. The channel bases
83 include a series of aligned apertures or perforations 86 (FIG.
5) therethrough in which the pedestal actuator rod 45 or 51 is captured,
as described in greater detail hereinafter. The interior ends 87
(FIG. 4) of lock slides 81 and 82 include integrally formed, upstanding
tabs 88 with horizontal slots 89 through the upper ends of the
tabs. Tabs 88 are formed by laterally slicing the channel, and forming
the tab upwardly, such that a narrower channel portion 90 is formed
between tab 88 and the rearward sidewall 85.
In the illustrated structure, pierced, inverted L-shaped flanges
95 (FIGS. 4 and 5) project upwardly from the base 70 of end covers
12 and 13 and are aligned in a parallel relationship with the forward
sidewall 71 of end covers 12 and 13. Pierced protuberances 96 are
formed in the forward sidewalls 71 of end covers 12 and 13 and
extend laterally outwardly toward flanges 95. The distance between
the vertical leg 97 of flange 95 and the interior surface of forward
sidewall 84 is slightly greater than the width of lock slides 81
and 82 to closely receive the same therebetween. The distance between
the base 70 of end covers 12 and 13 and the horizontal leg 98 of
flange 95 as well as the outwardly protruding portion 99 (FIG.
6) of protuberance 96 is substantially equal to the height of associated
lock slide sidewalls 84 and 85 whereby flanges 95 and protuberance
96 form guides on cover members 12 and 13 in which lock slides 81
and 82 reciprocate.
An actuator assembly 103 (FIG. 4) interconnects lock slides 81
and 82 with the drive shaft portion 64 of key lock 7. Actuator assembly
103 comprises a link 104 having laterally offset, L-shaped tabs
105 at opposite ends thereof, which are shaped to be closely received
through the slots 89 in lock slide tabs 88. A crank arm 106 is detachably
connected with key lock shaft 64 by a fastener 107 and includes
a non-circularly shaped window through which a mating portion of
key lock shaft 64 is received, such that crank arm 106 rotates with
tumbler cylinder 61. A lock washer 108 is positioned over fastener
107 and securely retains crank arm 106 on lock drive shaft 64. Crank
arm 106 includes a laterally extending bracket arm 109 to which
one end of a coil spring 110 is attached. The opposite end of spring
110 is anchored to left-hand cover 12 to resiliently urge the actuator
assembly 103 into a normally locked position. An actuator arm 111
has one end pivotally connected with crank arm 106 at pivot point
112 and the opposite end is pivotally connected with a medial portion
of link 104 at pivot point 113 whereby rotation of tumbler cylinder
61 reciprocates both lock slides 81 and 82.
The illustrated actuator assembly 103 is particularly adapted for
over-centered lock embodiments, and is described in detail in my
co-pending U.S. patent application entitled OVER-CENTERED LOCK ARRANGEMENT
FOR OFFICE FURNITURE UNITS, which has already been referenced hereinabove.
Actuator assembly 103 is configured such that in the locked position,
pivot points 112 and 113 are oriented in an over-centered relationship
with respect to the axis of rotation of tumbler cylinder 61 whereby
external forces applied to lock slides 81 and 82 in a direction
to unlock pedestal 3 rotatably urge tumbler cylinder 61 further
toward the locked position to prevent damage to the lock tumblers,
and facilitate insertion and withdrawal of key 65.
Center cover 15 encloses the remaining, medial portion of channel
8 and is detachably connected with the left and right-hand end
covers 12 and 13 to provide ready access to primary lock 7. The
width of channel 8 at least at that position which center cover
15 encloses, is sufficient to remove key lock 7 by translating the
lock rearwardly and downwardly, as described in detail hereinafter.
With reference to FIG. 4 center cover 15 includes a base 119 having
an end wall 120 upstanding from the rear edge thereof. Slots 121
extend through the opposite sides of the lower edge of rear wall
121 and define wing-shaped free ends 118 for purposes to be described
in greater detail below. A pair of hook-shaped hangers 122 are connected
with the side edges of cover base 120 and include forwardly extending
prongs 123. The forward portion 124 of base 120 is slightly narrower
than the rearward base portion, and includes a recess or channel
125 extending laterally thereacross. A front wall 126 extends upwardly
along the front edge of base 120 and includes outwardly extending
free ends 127 in the nature of wings for purposes to be described
below. A stop or tab 128 protrudes upwardly from the forward portion
124 of base 120 along the side edge thereof, and has a rearward
edge disposed adjacent to channel 125.
As best illustrated in FIG. 5 the interior ends of covers 12 and
13 include upstanding, inverted L-shaped flanges 133 having elongate,
rectangularly shaped slots 134 and circular fastener apertures
135 disposed adjacent the forward, interior corner of the upper
leg of flanges 133. At the forward side of the base portion 70 of
end covers 12 and 13 elongate slots 136 extend through the end
edges, and are oriented generally parallel with the longitudinal
axis of the end covers. Slots 136 are aligned with each other, and
are shaped to receive the free ends 127 of center cover front wall
126 therethrough. Inverted L-shaped flanges 137 extend rearwardly
from the forward sidewalls 71 of covers 12 and 13 and are positioned
over at least a portion of slots 136. The horizontal legs 138 of
flanges 137 are disposed at an elevation which is substantially
commensurate with the height of center cover front wall 126 such
that the free ends 127 of front wall 126 are captured between flange
legs 138 and the bases 70 of end covers 12 and 13.
As best illustrated in FIGS. 7 8 and 8A, center cover 15 is attached
to end covers 12 and 13 in the following manner. Center cover 15
is positioned directly below the opening formed between the interior
ends of end covers 12 and 13 as shown in FIG. 7. The front wall
126 of cover 15 is disposed directly in line with slots 136 and
the rear wall 128 of cover 15 is positioned in alignment with the
gap formed between the rear edge of flanges 133 and the forward
sidewall 35 of reinforcing channel 32. In this position, hook-shaped
hangers 122 are disposed directly below, and in alignment with mating
slots 134. With key lock 7 in the unlocked position, cover 15 is
then translated upwardly, such that the forward and rearward walls
126 and 120 of cover 15 as well as hanger 122 are received through
their mating apertures in the interior ends of end covers 12 and
13. Cover 15 is then translated forwardly, such that hangers 122
engage flanges 133 the free ends 118 of rear wall 121 engage flanges
133 and the free ends 127 of front wall 126 are captured between
the bases 70 of end covers 12 and 13 and the horizontal legs 138
of flanges 137.
In this locked position, cover member 15 prevents convergence of
end covers 12 and 13 such that they cannot be converged and removed
without first removing center cover 15. Fasteners 141 (FIGS. 7 and
8) are inserted through side slots 142 in center cover 15 and engage
apertures 135 in flanges 133 to positively retain the center cover
in position when the lock assembly is shifted between the locked
and unlocked positions. When key lock 7 is rotated into the locked
position shown in FIG. 8 the interior end 87 of the left-hand lock
slide 81 extends into the channel 125 of center cover 15 behind
stop tab 128. Hence, when key lock 7 is in the locked position,
even if cover fasteners 141 are removed, center cover 15 cannot
be removed, since abutment between tab 128 and interior end 87 of
the left-hand lock slide 81 prevents rearward translation of the
center cover. When key lock 7 is rotated to the unlocked position,
the interior end 87 of left-hand lock slide 81 is retracted back
into the left-hand end cover 12 to permit tab 128 to slide rearwardly
past the forward edge of the same.
To change key lock 7 key 65 is inserted into the lock, and tumbler
cylinder 61 is rotated to the unlocked position. Cover screws 141
are then removed, and center cover 15 is pushed rearwardly until
hangers 122 and the free ends of cover walls 120 and 126 are vertically
aligned with their mating apertures. Cover 15 is then pulled downwardly
out of engagement with the top 6. Actuator spring 110 is removed,
and fastener 107 is detached so that crank arm 106 can be slid rearwardly
off of lock shaft 64. Actuator assembly 103 is then rotated upwardly,
in the direction of the arrow shown in FIG. 10 and link tabs 105
are withdrawn from the mating slots 89 in the interior ends of lock
slides 81 and 82. Next, lock fasteners 66 are removed and lock 7
is pulled rearwardly out through channel 8. Lock 7 is replaced by
simply reversing the above-described sequence of steps.
A center drawer adapter 145 is illustrated in FIGS. 12-16 and
provides a mechanism to lock a center drawer 146 which is slidably
suspended from the lower surface of top 6 by brackets 147. Center
drawer 146 has a generally conventional construction, and includes
a forward well 148 and a rearward lock channel 149. A lock rod
150 is rotatably supported on the lower surface of top 6 and has
a forward end 151 which is laterally offset from the longitudinal
axis of rod 150 to form a crank. The rearward end 152 of lock rod
150 is L-shaped, and selectively engages lock channel 149 to retain
center drawer 146 closed. A lock rod actuator 153 is connected with
lock slides 81 and 82 and pivots lock rod 150. The ends of actuator
153 include inverted L-shaped ends 154 which extend through the
interior windows 155 in the bases 70 of cover members 12 and 13
which are formed in piercing flanges 95. The right-hand end of actuator
153 is received in a mating slot 156 (FIGS. 9 and 10) in the interior
end of right-hand lock slide 82. The left-hand end of actuator 153
is attached to the interior end of the left-hand lock slide 81 by
a fastener 157 received in a mating aperture 158 such that actuator
153 reciprocates with lock slides 81 and 82. Actuator 153 includes
a centrally positioned, depending bracket 159 having a vertically
elongated aperture in which the forward end 151 of lock rod 150
is pivotally received, such that reciprocaton of actuator 153 rotates
lock rod 150 between locked and unlocked positions. A rear, U-shaped
bracket 160 is attached to the lower surface of top 6 by fasteners
165 and rotatably supports the rearward end of lock rod 150.
Center drawer adapter assembly 145 includes a special cover 161
to replace previously described center cover 15. Cover 145 encloses
the open area between the interior ends of cover members 12 and
13 as well as windows 155. Cover 145 includes a laterally extending
recess or channel 162 in which actuator 153 reciprocates, and a
rearwardly extending, U-shaped trough 163 in which the forward end
of lock rod 150 is rotatably supported. Cover 161 is attached to
the interior ends of end covers 12 and 13 by fasteners 164. Since
cover 161 is disposed within the confines of center drawer 146 in
the locked position, only authorized personnel are permitted access
to the lock arrangement 1.
As best illustrated in FIGS. 15 and 16 the rearward portion of
lock rod 150 includes a plurality of spaced apart, downwardly protruding
ears 170 which are shaped for close reception in a slot 171 through
rear bracket 160. For relatively shallow work surfaces, bracket
160 is positioned so that an appropriate one of the lock rod ears
170 is received through slot 171. For relatively deep work surfaces,
the rearward end 152 of lock rod 150 extends through bracket slot
171.
Center drawer 146 is installed in the following manner. Center
cover 15 is removed from furniture unit 2 in the manner described
above. Drawer brackets 147 are attached to the lower surface of
top 6 at the desired location. The lateral position of center drawer
brackets 146 under top 6 can be varied as desired, so long as the
access opening which cover 161 encloses remains within the interior
of center drawer 146. Actuator 153 is attached to lock slides 81
and 82 and the forward end 151 of lock rod 150 is positioned in
bracket 159. Rear bracket 160 is then installed, and cover 161 is
attached to end covers 12 and 13 by fasteners 164. Center drawer
146 is then inserted between support brackets 147.
To assemble a pedestal 3 to furniture unit 2 pedestal 3 is positioned
under top 6 at one of several preselected locations. Pedestal 3
is raised upwardly toward the lower surface of top 6 and actuator
rod 45 or 51 is inserted through a vertically aligned one of the
windows 155 in end covers 12 or 13 and thence through a mating
perforation 86 in the associated one of the lock slides 81 or 82.
Fasteners (not shown) attach pedestal 3 to the lower side of top
6 in a suspended fashion. Reciprocation of lock slides 81 and 82
laterally shifts actuator 153 which rotates rod 150 to lock and
unlock compartment 4.
Lock arrangement 1 provides a very compact, economical construction,
which is very strong, durable, and particularly adapted for in-top
lock arrangements. The three-piece cover assembly permits easy access
to the primary lock 7 such that even unskilled personnel can remove
and replace the same, yet has sufficient security to prevent surreptitious
entry. An internally mounted lock arrangement retains the center
cover 15 in position, and is preferably operably connected with
the primary lock 7 such that shifting the primary lock between
the locked and unlocked positions automatically locks and unlocks
the cover 15 whereby only personnel having a key to lock 7 can
gain access to the lock arrangement. The center drawer adapter 145
easily and quickly converts the lock arrangement 1 for use in center
drawer constructions.
In the foregoing description it will be readily appreciated by
those skilled in the art that modifications may be made to the invention
without departing from the concepts disclosed herein. Such modifications
are to be considered as included in the following claims, unless
these claims by their language expressly state otherwise. |