US3879013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check-type drain valve
Assignee: Caterpillar Inc
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Filing: 1972-10-27
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Granted: 1975-04-22
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Expires: 1992-10-27
Abstract
Abstract A check-type drain valve assembly for a hydraulic fluid storage tank having a plug equipped drain port at the bottom thereof. A spring-retaining cage member extends through an aperture in the storage tank to the interior thereof. An externally mounted adapted member firmly clamps the cage member in position and also acts as a threaded retainer for a drain plug or for the threaded coupling of a drain tube. A spring loaded fluted check valve is mounted within said cage member and is spring biased into abutting engagement with the drain plug or tube coupling when the drain plug or coupling is inserted in the adapter member. The check valve positively closes off the drain port when the drain plug is removed. The spring loaded check valve is adapted to open and allow the flow of hydraulic fluid from the tank only when a drain tube or other fitting is sealingly inserted into the drain port.
Inventors
- 👤 Jr Thomas J Hajek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:05
CPC Classifications
F; F16; F16K; F16K21/00; F01; F01M; F01M11/00; F01M11/04; F01M11/0408; F16K15/00; F16K15/18; F01M2011/0416; F01M2011/0425; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7937
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
258 words
A combination drain assembly for controlling the flow of fluid from a storage tank comprising; adapter means having passage means therein for communicating fluid from said storage tank to the exterior thereof, check valve means movably mounted within said passage means for selectively opening and closing said passage means to respectively permit and prevent fluid flow from said storage tank to said passage means, biasing means for constantly urging said check valve means toward a passage means closing position, cage means for retaining said biasing means in position, closure plug means selectively insertable in said passage means for closing off said passage and for directly engaging and urging said check valve means toward a position in which it does not block the flow of fluid from said storage tank to said passage means, said cage means including a unitary stepped member having a first portion for engaging said check valve means and having a second portion for engaging said adapter means, said check valve means including a valve body having a stem portion and a fluted portion, said portions being interconnected by an enlarged seating portion, said enlarged seating portion comprising an annular flange disc having first and second substantially flat surfaces thereupon and wherein said first surface is adapted to coact with said stepped member to limit movement of said valve body in a first predetermined direction and wherein said second surface is adapted to sealingly engage said adapter means to close off said passage means upon removal of said closure plug means from said passage means.
Claim 2
Dependent Claim
258 words
A combination drain assembly for controlling the flow of fluid from a storage tank comprising; adapter means having passage means therein for communicating fluid from said storage tank to the exterior thereof, check valve means movably mounted within said passage means for selectively opening and closing said passage means to respectively permit and prevent fluid flow from said storage tank to said passage means, biasing means for constantly urging said check valve means toward a passage means closing position, cage means for retaining said biasing means in position, closure plug means selectively insertable in said passage means for closing off said passage and for directly engaging and urging said check valve means toward a position in which it does not block the flow of fluid from said storage tank to said passage means, said cage means including a unitary stepped member having a first portion for engaging said check valve means and having a second portion for engaging said adapter means, said check valve means including a valve body having a stem portion and a fluted portion, said portions being interconnected by an enlarged seating portion, said enlarged seating portion comprising an annular flange disc having first and second substantially flat surfaces thereupon and wherein said first surface is adapted to coact with said stepped member to limit movement of said valve body in a first predetermined direction and wherein said second surface is adapted to sealingly engage said adapter means to close off said passage means upon removal of said closure plug means from said passage means.
Claim 3
Dependent Claim
258 words
A combination drain assembly for controlling the flow of fluid from a storage tank comprising; adapter means having passage means therein for communicating fluid from said storage tank to the exterior thereof, check valve means movably mounted within said passage means for selectively opening and closing said passage means to respectively permit and prevent fluid flow from said storage tank to said passage means, biasing means for constantly urging said check valve means toward a passage means closing position, cage means for retaining said biasing means in position, closure plug means selectively insertable in said passage means for closing off said passage and for directly engaging and urging said check valve means toward a position in which it does not block the flow of fluid from said storage tank to said passage means, said cage means including a unitary stepped member having a first portion for engaging said check valve means and having a second portion for engaging said adapter means, said check valve means including a valve body having a stem portion and a fluted portion, said portions being interconnected by an enlarged seating portion, said enlarged seating portion comprising an annular flange disc having first and second substantially flat surfaces thereupon and wherein said first surface is adapted to coact with said stepped member to limit movement of said valve body in a first predetermined direction and wherein said second surface is adapted to sealingly engage said adapter means to close off said passage means upon removal of said closure plug means from said passage means.
Claim 4
Dependent Claim
258 words
A combination drain assembly for controlling the flow of fluid from a storage tank comprising; adapter means having passage means therein for communicating fluid from said storage tank to the exterior thereof, check valve means movably mounted within said passage means for selectively opening and closing said passage means to respectively permit and prevent fluid flow from said storage tank to said passage means, biasing means for constantly urging said check valve means toward a passage means closing position, cage means for retaining said biasing means in position, closure plug means selectively insertable in said passage means for closing off said passage and for directly engaging and urging said check valve means toward a position in which it does not block the flow of fluid from said storage tank to said passage means, said cage means including a unitary stepped member having a first portion for engaging said check valve means and having a second portion for engaging said adapter means, said check valve means including a valve body having a stem portion and a fluted portion, said portions being interconnected by an enlarged seating portion, said enlarged seating portion comprising an annular flange disc having first and second substantially flat surfaces thereupon and wherein said first surface is adapted to coact with said stepped member to limit movement of said valve body in a first predetermined direction and wherein said second surface is adapted to sealingly engage said adapter means to close off said passage means upon removal of said closure plug means from said passage means.
Claim 5
Dependent Claim
31 words
The invention of claim 1 wherein said biasing means is a coil spring surroundingly mounted upon said stem portion and engaging both said first substantially flat surface and said stepped member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |