Water filter abstract
A water filter outer shell having an improved sleeve and top cover.
The top cover and sleeve are formed with interior and exterior conical
surfaces, the lower half of the conical surface of the outer shell
having exterior threads. The top cover is fastened by screwing interior
and exterior threads near the conical surfaces of the top cover
and outer shell to eliminate three components from the known device.
The tightness and water permeation seal are thus stronger and more
effective. The structure has lower production costs to improve market
competition.
Water filter claims
What is claimed is:
1. An improved structure for a water filter outer shell comprising:
a) an outer shell with at least one open end portion, the at least
one open end portion having: a flange extending outwardly therefrom;
a truncated conically-configured external surface diminishing in
cross-sectional dimension in a longitudinal direction toward an
open end of the at least one open end portion the conically-configured
surface having at least one O-ring groove formed therein; and external
threads located between the conically-configured surface and the
flange;
b) an O-ring located in the at least one O-ring groove; and
c) a top cover with a fluid inlet and a fluid outlet, the top cover
having: a truncated conically-configured internal surface complementary
to the truncated conically-configured external surface; and an internally
threaded portion, threadingly engaged with the external threads
of the outer shell such that the truncated conically-configured
internal surface contacts the O-ring.
2. The improved structure for a water filter outer shell of claim
1 further comprising a plurality of O-ring grooves formed in the
truncated conically-configured external surface.
3. The improved structure for a water filter outer shell of claim
1 further comprising:
a) an external end surface on the open end portion of the outer
shell;
b) an internal sealing surface on the top cover, the internal sealing
surface being located adjacent to the external end surface when
the top cover is threaded onto the outer shell; and
c) an end O-ring located between and in contact with the external
end surface and the internal sealing surface.
Water filter description
BACKGROUND OF THE INVENTION
This invention relates to an improved structure for a water filter
outer shell, specially relating to an improvement that has lower
costs of production.
The known water filter outer shell structure consists of a flange
position on the exterior wall near the tubular opening conical wall
surface with an O-ring seated against the conical surface of the
interior wall by a top cover over the upper extend of the outer
shell. There is an exterior thread formed along the outer wall of
the aforesaid top cover as well as a sleeve that has a matching
inner thread and which can be inserted on the outer shell and further
screwed onto the top cover. The inner lip at the lower edge of the
sleeve tightly secures the top cover to the outer shell as well
as produces an interior generated binding force secured outward
to the outer shell, increases the internal resistance pressure of
the outer shell. This, therefore, reduces the tubular wall thickness
of the outer shell and, furthermore, increases the water permeation
seal.
SUMMARY OF THE INVENTION
It is an object of this invention to improve the sleeve and top
cover as whole, the top cover is having inner threads and inner
conical surfaces. The top groove has a circular groove for a seated
O-ring and the lower half of the conical surface of the outer shell
has exterior threads, which mach the interior threads of the top
cover. The top cover is tightly fastened with screwing the interior
and exterior threads on the conical surface of outer shell, enabling
the removal of three components of the known structures, and increasing
the tightness and water permeation seal. The present structure has
lower costs of production making it more competitive on the market.
BRIEF DESCRIPTION OF THE DRAWINGS
In order that the invention may be fully understood, it will now
be described by way of example, with reference to the accompanying
drawings in which like reference numerals or characters represent
like parts and where in:
FIG. 1 is an exploded perspective view of a known water filter
outer shell.
FIG. 2 is an exploded perspective view partially in cross-section
of the present invention.
FIG. 3 is a partial cross-sectional view of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIG. 1 the known structure is comprised of a tube-shaped
outer shell (1), a top cover (2), and sleeve, of which the outer
shell (1) has a flange (11) formed on and protruding from the exterior
wall near the tubular opening. Along the upper extend between wall
of the tubular opening is a conical surface (12) having a larger
lower portion and smaller upper portion, and formed into the said
conical surface (12) at a suitable position is one or two circular
grooves (121) that provides for the seating of an O-ring (13). At
the upper half of the top cover (2) are the necessary input and
output water ports and extending from the lower half is an annular
wall having threads (212). The conical surface (12) of the outer
shell (11) faces the interior wall of the top cover (2) to enable
the top cover (2) to be inserted downward from the top onto the
tubular opening of the outer shell (1) which enables the mutual
contact of these elements, while also causing the O-ring (13) to
be squeezed between the aforesaid elements to form a water permeated
seal. The sleeve (3) consists of a ring shaped body that has a lip
(31) extending inward from the lower edge and interior threads (32)
formed on the interior wall of the aforesaid sleeve (3) that match
the exterior threads (212) on the top cover (2). This enables the
threaded fastening of the aforesaid sleeve (3) to the aforesaid
top cover (2). After the top cover (2) is fastened to the outer
shell (1), the sleeve (3) can be inserted upward over the outer
shell (1) and be fastened by screwing onto the top cover (2). When
the lip (31) inside the sleeve (3) contacts the flange (11) of the
outer shell (1), the continuous rotation of the sleeves (3) causes
the top cover (2) to tighten downward which causes a tighter degree
of contact between the top cover (2) and the conical surface (12)
until the lower edge of the top cover (2) is firmly engaged against
the flange (11) of the outer shell (1) to produce an optimal water
permeation seal. The present invention eliminates the need for the
sleeve (3) of the known structures. The top cover of the present
invention, in addition to having the necessary input and output
water ports and an interior conical surface (211), also has a lower
half with interior threads (213). The present invention eliminates
the exterior threads (212) on the outer wall of the cover (2). The
outer shell (1) is lower and smaller than the known devices and
has one or two circular grooves (121) on the conical surface (12)
for O-rings (13) to be inserted. Exterior threads (14) are formed
on the exterior walls of the lower half of the said conical surface
(12) that match the interior threads (213) of the top cover (2).
The top cover is secured by engagement of the interior threads (213)
of top cover (2) and the exterior threads (14) of the outer shell
(1), which causes the tubular opening that is between the top surface
of interior and exterior conical surfaces (211 12) and shell (3)
to be tightly closed with the O-rings (13 23) to form a perfect
water permeation seal. Furthermore, the structure has solidity and
strength with a simplified structure.
The foregoing description of the present invention has been directed
to a particular embodiment thereof for purposes of explanation and
illustration; however, it will be apparent to those skilled in this
art that many modifications and changes in the embodiment shown
may be made without departing from the teachings of the present
invention. Accordingly, what subject matter which applicant regards
to be his invention is set forth in the following claims. |