US4745894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil drain valve
Assignee: Eaton Aeroquip LLC
•
Filing: 1987-09-25
•
Granted: 1988-05-24
•
Expires: 2007-09-25
Abstract
Abstract The invention pertains to an oil drain fitting for internal combustion engines which permits a quick draining of the oil. A body threaded into the conventional oil pan drain hole includes an axial passage having a tubular valve reciprocally mounted therein. The valve is open at its lower end and closed at its inner end having a head which seats against the inner end of the body. The lower end of the valve includes an abutment surface for engagement by a drain conduit fitting for axially displacing the valve inwardly to open the valve and permit flow therethrough. A cap may be mounted on the body to enclose the lower end of the valve when the fitting is not in use.
Inventors
- 👤 Robert A. Laipply
- 👤 Paul J. E. Fournier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:22
CPC Classifications
F; F01; F01M; F01M11/00; F01M11/04; F01M11/0408; F01M2011/0416; F01M2011/0425
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
200 words
An oil drain fitting for internal combustion engines comprising, in combination, an elongated tubular body having an inner end and an outer end, a passage axially extending through said body intersecting said ends, an external thread defined on said body adjacent said inner end for threading said body into an engine drain hole, valve operating attachment means defined on said body adjacent said outer end, a tubular valve axially reciprocally mounted within said passage having an open end adjacent said body outer end and a closed end adjacent said body inner end, a valve seat defined on said body adjacent said inner end, a valve head defined on said valve closed end engagable with said seat when said valve is axially positioned to a closed position, a port defined in said valve adjacent said head communicating with the interior of said valve whereby oil will flow into said valve when said valve is axially positioned to an open position when said head disengages said seat, spring means mounted on said body axially biasing said valve toward said closed position, and valve actuating means defined on said valve for axially displacing said valve from said closed position to said open position.
Claim 2
Dependent Claim
200 words
An oil drain fitting for internal combustion engines comprising, in combination, an elongated tubular body having an inner end and an outer end, a passage axially extending through said body intersecting said ends, an external thread defined on said body adjacent said inner end for threading said body into an engine drain hole, valve operating attachment means defined on said body adjacent said outer end, a tubular valve axially reciprocally mounted within said passage having an open end adjacent said body outer end and a closed end adjacent said body inner end, a valve seat defined on said body adjacent said inner end, a valve head defined on said valve closed end engagable with said seat when said valve is axially positioned to a closed position, a port defined in said valve adjacent said head communicating with the interior of said valve whereby oil will flow into said valve when said valve is axially positioned to an open position when said head disengages said seat, spring means mounted on said body axially biasing said valve toward said closed position, and valve actuating means defined on said valve for axially displacing said valve from said closed position to said open position.
Claim 3
Dependent Claim
41 words
In an oil drain fitting as in claim 1, said valve operating attachment means comprising drain conduit fitting connection means defined on said body adjacent said outer end for receiving a fitting having a probe for engaging said valve actuating means.
Claim 4
Dependent Claim
32 words
In an oil drain fitting as in claim 1, an annular seal ring mounted on valve head engagable with said valve seat, said valve seat being defined by said body inner end.
Claim 5
Dependent Claim
50 words
In an oil drain fitting as in claim 3, said valve head including a lip having a diameter greater than the diameter of said passage at its intersection with said body inner end, said seal ring being located adjacent said lip and in axial alignment with said body outer end.
Claim 6
Dependent Claim
24 words
In an oil drain fitting as in claim 1, said valve actuating means comprising an abutment defined upon said valve adjacent said open end.
Claim 7
Dependent Claim
25 words
In an oil drain fitting as in claim 1, said valve actuating means comprising a radially outwardly extending flange defined upon said valve open end.
Claim 8
Dependent Claim
23 words
In an oil drain fitting as in claim 6, said spring means comprising a compression spring interposed between said flange and said body.
Claim 9
Dependent Claim
105 words
In an oil drain fitting as in claim 6, said valve comprising a substantially cylindrical thin wall tube having a closed end closed by the tube material, said valve head being homogeneously defined on said closed end and including an annular lip of a diameter greater than that of said tube, said lip being deformable away from said tube open end to define an axially projected diameter less than that of said tube and passage whereby said valve closed end may be inserted into said body passage and said lip may be radially deformed outwardly to axially align with and overlie said body inner end.
Claim 10
Dependent Claim
45 words
In an oil drain fitting as in claim 8, an annular seal recess defined in said valve head adjacent said lip, an elastic seal within said recess, said lip retaining said seal within said recess upon being deformed to align with said body inner end.
References Cited (Backward Citations)
US28844A
Cited
US3486730A
Cited
US3727638A
Cited
US3879013A
Cited
USRE28844E
Cited
US3948481A
Cited
US4025048A
Cited
US4269237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |