Filter device for a water filter

• US 5,914,037 A
• Filed: 11/24/1997
• Issued: 06/22/1999
• Est. Priority Date: 11/24/1997
• Status: Expired due to Fees

• Current Assignee: Chuan Da Enterprise Co., Ltd.
• Original Assignee: Chuan Da Enterprise Co., Ltd.
• Inventors: Yen, Chiu-Sen
• Primary Examiner(s): Reifsnyder, David A.
• Application Number:
  US08/977,195
• Time in Patent Office: 575 Days
• Field of Search: 210/234, 210/235, 210/435
• US Class Current: 210/234
• CPC Class Codes: B01D 35/153 Anti-leakage or anti-return valves

Abstract

A filter device for a water filter includes a coupling device and a filter cartridge. A water inlet opening and a water outlet opening are formed on the coupling device. The coupling device has an inner casing with a reversed cone shaped through hole in the center. A valve member controlled by an elastic element is configured within the coupling device. The valve member, which includes a hollow rod with through holes formed on the side wall, completely blocks the cone shaped through hole if no filter cartridge is connected. When the filter cartridge is securely fastened to the coupling device, the elastic element is compressed so as to form a water inlet path from the water inlet opening through the coupling device, the valve member and the filter cartridge. A separate water outlet path from the filter cartridge through the coupling device to the water outlet opening provides filtered water ready for drinking.

Claims

1. A filter device for a water filter comprising:

a coupling device including;

an outer casing comprising a hollow interior space and a base, said base having a hole and a plurality of grooves adjacent to the hole;

an inner casing comprising a hollow interior space, a water outlet hole and a top plate, said top plate having a reversed conical central through hole;

a valve member comprising a head part having a conical structure matching said reversed conical central through hole, a hollow rod having side-wall through holes and an annular flange, said head part and said hollow rod being fastened together from two sides of said top plate;

an elastic element being placed between said head part and said annular flange for controlling said valve member, said central through hole being completely blocked by said head part if said elastic element is not compressed;

and a cover body having a water inlet opening and a water outlet opening;

wherein said inner casing is affixed to said cover body and inserted in the hollow interior space of said outer casing so that said cover body covers said outer casing and a water outlet path is formed from said water outlet hole to said water outlet opening;

and a filter cartridge including;

a set body comprising a set plate, a water inlet tube passing through said set plate, a water outlet tube having an opening on said set plate and plurality of ribs mounted on said set plate and said water inlet tube, said water inlet tube being connected with a water inlet hose, and said ribs each having a groove;

a fixation device comprising a tubular body having a plurality of flanges formed thereon, said flanges being matched with said grooves of said base of said outer casing, and said tubular body having a central hole through which said water inlet tube is inserted for securely fixing and coupling said set body to said fixation device by said ribs;

a filter cylinder comprising filtering material;

and a base body connecting said filter cylinder;

wherein said fixation device is affixed to and covers said filter cylinder;

wherein a water outlet path is formed from said water outlet tube through the central hole of said tubular body and said water outlet hole to said water outlet opening; and

said elastic element is compressed to form a water inlet path from said water inlet opening through said side-wall through holes, said hollow rod and said water inlet tube to said water inlet hose when said fixation device is inserted into the hole of said base of said outer casing and rotated for locking the flanges of said tubular body within said outer casing.

2. The filter device according to claim 1, wherein said head part and the interior surface of said hollow rod have matched threads for being screwed and fastened tightly together.

3. The filter device according to claim 1, wherein said base body is secured within said filter cylinder by bending one end of the side wall of said filter cylinder inward.

4. The filter device according to claim 1, wherein said fixation device is affixed to said filter cylinder by bending one end of the side wall of said filter cylinder inward.