US3874478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crankcase drain valve with attachment for disposable oil bags
Assignee: Individual
•
Filing: 1974-03-20
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Granted: 1975-04-01
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Expires: 1994-03-20
Abstract
Abstract A crankcase drain valve adaptable for replacing the standard oil drain plug commonly used for draining used oil from the crankcases of most internal combustion engines comprising a threaded plug portion and an integral hexagon-shaped valve body portion having a drain hole extending axially through both portions. The drain valve is provided with a tapered bore extending laterally through the drain hole which is adapted to receive a tapered removable valve core. A retaining spring holds the core in place and prevents leakage of oil from the crankcase until a disposable oil bag is mounted on the drain valve to catch the used oil from the crankcase when the tapered valve core in the valve body is removed.
Inventors
- 👤 Jr Cornelius Mantell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:53
CPC Classifications
F; F01; F01M; F01M11/00; F01M11/04; F01M11/0408
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
371 words
A drain plug assembly for use on an automotive crankcase comprising in combination: a plug threadedly receivable in a threaded opening in the bottom of a crankcase and provided with a drain bore extending axially therethrough, said plug being provided with a polygonal shaped outer surface along a first part of its length for engagement by a tool for threading it into the threaded opening of the crankcase and a cylindrically shaped portion along a second part of its length, said first part of said plug being provided with a valve bore extending laterally through said drain plug and intersecting said drain bore, a valve core for removably positioning longitudinally thereof into said valve bore with an interference fit to seal said drain bore, spring means for detachably clamping around at least a part of the outer periphery of said first part of said plug for holding said valve core in said valve bore, a groove formed in the outer surface of said second part of said plug for receiving the neck of a drain bag therein, the large diameter end of said valve core being provided with a necked-down portion, said spring means comprising a flat, resilient spring bent into a polygonal shape conforming to the polygonal shape of said first part of said plug for interference fit therewith, said spring being provided with an aperture of a size large enough to fit over the necked-down end of said valve core but smaller than the large diameter end of said valve core, whereby when the aperture of said spring receives the necked-down end of said valve core and said spring is clamped around said polygonal surface of said plug, said valve core is firmly held in place in said valve bore, and an oil impervious, resilient bag having a neck portion for fitting within said groove for attachment thereto upon removal of said spring from around said plug, said bag being provided with an aperture in its neck portion for fitting over the necked-down portion of said valve core in an interference fit, said valve core being suspended by said bag within its interior when said valve core is removed from said valve bore for draining oil from the crankcase.
Claim 2
Dependent Claim
371 words
A drain plug assembly for use on an automotive crankcase comprising in combination: a plug threadedly receivable in a threaded opening in the bottom of a crankcase and provided with a drain bore extending axially therethrough, said plug being provided with a polygonal shaped outer surface along a first part of its length for engagement by a tool for threading it into the threaded opening of the crankcase and a cylindrically shaped portion along a second part of its length, said first part of said plug being provided with a valve bore extending laterally through said drain plug and intersecting said drain bore, a valve core for removably positioning longitudinally thereof into said valve bore with an interference fit to seal said drain bore, spring means for detachably clamping around at least a part of the outer periphery of said first part of said plug for holding said valve core in said valve bore, a groove formed in the outer surface of said second part of said plug for receiving the neck of a drain bag therein, the large diameter end of said valve core being provided with a necked-down portion, said spring means comprising a flat, resilient spring bent into a polygonal shape conforming to the polygonal shape of said first part of said plug for interference fit therewith, said spring being provided with an aperture of a size large enough to fit over the necked-down end of said valve core but smaller than the large diameter end of said valve core, whereby when the aperture of said spring receives the necked-down end of said valve core and said spring is clamped around said polygonal surface of said plug, said valve core is firmly held in place in said valve bore, and an oil impervious, resilient bag having a neck portion for fitting within said groove for attachment thereto upon removal of said spring from around said plug, said bag being provided with an aperture in its neck portion for fitting over the necked-down portion of said valve core in an interference fit, said valve core being suspended by said bag within its interior when said valve core is removed from said valve bore for draining oil from the crankcase.
Claim 3
Dependent Claim
22 words
The drain plug assembly set forth in claim 1 wherein: said bag is provided with a vent hole in its neck portion.
Claim 4
Dependent Claim
18 words
The drain plug assembly set forth in claim 1 wherein: said bag is formed of a plastic material.
Claim 5
Dependent Claim
35 words
The drain plug assembly set forth in claim 1 in further combination with: a twist wire for twisting around the neck of said bag within said groove for firmly attaching said bag to said plug.
Claim 6
Dependent Claim
54 words
The drain plug assembly set forth in claim 4 wherein: the open end of said neck portion of said bag is provided with an edge rolled over on itself to keep from being pulled from under said twist wire when said twist wire is twisted around the neck of said bag within said groove.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |