US3636932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tappet with means for relieving entrained air
Assignee: Stanadyne LLC
•
Filing: 1970-05-18
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Granted: 1972-01-25
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Expires: 1990-05-18
Abstract
Abstract A hydraulic tappet is formed by a barrel having a closed end and a plunger reciprocal within the barrel. The plunger has an oil chamber and a cap is seated on one end of the plunger to close the oil chamber. Passage means are provided at the seat of the cap upon the plunger for the relief of air within the plunger chamber.
Inventors
- 👤 William B Hamilton
- 👤 Kenneth W Lesher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:42
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/20; F01L1/22; F01L1/24; F01L1/245
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
133 words
In a hydraulic tappet, a barrel closed at one end and open at the other end, and oil passage in the barrel, a plunger reciprocal within the barrel, a chamber between the barrel closed end and the plunger, spring means within the chamber biasing the plunger toward the barrel open end, a chamber within the plunger, an oil passage in the plunger connecting the plunger chamber and the barrel oil passage to permit oil to flow from outside the barrel into the plunger chamber, a seat at the end of the plunger spaced from the barrel chamber, said plunger oil passage being spaced from said plunger seat, a cap positioned on said plunger seat, and at least one passage located at the plunger seat for the relief of air within the plunger chamber.
Claim 2
Dependent Claim
133 words
In a hydraulic tappet, a barrel closed at one end and open at the other end, and oil passage in the barrel, a plunger reciprocal within the barrel, a chamber between the barrel closed end and the plunger, spring means within the chamber biasing the plunger toward the barrel open end, a chamber within the plunger, an oil passage in the plunger connecting the plunger chamber and the barrel oil passage to permit oil to flow from outside the barrel into the plunger chamber, a seat at the end of the plunger spaced from the barrel chamber, said plunger oil passage being spaced from said plunger seat, a cap positioned on said plunger seat, and at least one passage located at the plunger seat for the relief of air within the plunger chamber.
Claim 3
Dependent Claim
17 words
The structure of claim 1 further characterized by a plurality of passages formed in the plunger seat.
Claim 4
Dependent Claim
19 words
The structure of claim 2 further characterized in that said passages are formed by notches in the plunger seat.
Claim 5
Dependent Claim
20 words
The structure of claim 1 further characterized by a plurality of passages located in the cap adjacent the plunger seat.
Claim 6
Dependent Claim
29 words
The structure of claim 4 further characterized in that said passages are formed by a plurality of notches in that portion of the cap positioned on the plunger seat.
Claim 7
Dependent Claim
28 words
The structure of claim 5 further characterized in that said cap includes a flange overlying and positioned upon the plunger seat, said notches being formed in the flange.
References Cited (Backward Citations)
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Cited
US2267535A
Cited
US2689555A
Cited
US2874685A
Cited
US2873730A
Cited
US2956557A
Cited
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Cited
US3448730A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |