Patent US3630179A successfully refreshed from Google Patents.
US3630179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metered mechanical tappet
Assignee: Johnson Products Inc
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Filing: 1970-04-20
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Granted: 1971-12-28
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Expires: 1990-04-20
Abstract
Abstract A mechanical metering tappet which controls the oil pressure in the hollow push rod for supplying oil to overhead oiling systems of internal combustion engines by restricting the flow of the oil to the push rod. In one embodiment, this is accomplished by utilizing the diametral clearance of the push rod seat within its supporting cavity as the passageway for the oil from the crankcase to the reservoir. In another embodiment, the diametral clearance of the push rod seat is utilized to permit flow of oil but a metering disc used in conjunction with a specially configurated bottom surface of the seat provides the metering function. In both embodiments, the oil inlet hole in the tappet body is positioned above the tappet support shoulder for the push rod seat.
Inventors
- 👤 Morris V Dadd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:54
CPC Classifications
F; F01; F01M; F01M9/00; F01M9/10; F01L; F01L1/00; F01L1/12; F01L1/14; F01M9/104
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
143 words
In a mechanical tappet adapted to be operatively connected to a push rod for reciprocation within a crankcase, said tappet comprising a tappet body having an upper and lower cavity portion therein, an oil inlet hole means through the wall of said body and communicating with said cavity, a push rod seat positioned in said upper cavity portion, said push rod seat having an opening for supplying oil to a hollow push rod, support means for supporting said seat within said body above said lower cavity portion, said support means being fixed with relation to said tappet body, the improvement comprising: locating said oil inlet hole means above said support means; and means defining a constant restricted passageway between said oil inlet hole and said opening in said push rod seat for metering and restricting oil flow through said push rod seat opening.
Claim 2
Dependent Claim
143 words
In a mechanical tappet adapted to be operatively connected to a push rod for reciprocation within a crankcase, said tappet comprising a tappet body having an upper and lower cavity portion therein, an oil inlet hole means through the wall of said body and communicating with said cavity, a push rod seat positioned in said upper cavity portion, said push rod seat having an opening for supplying oil to a hollow push rod, support means for supporting said seat within said body above said lower cavity portion, said support means being fixed with relation to said tappet body, the improvement comprising: locating said oil inlet hole means above said support means; and means defining a constant restricted passageway between said oil inlet hole and said opening in said push rod seat for metering and restricting oil flow through said push rod seat opening.
Claim 3
Dependent Claim
64 words
The improved tappet as defined in claim 1, wherein said lower cavity portion defines an oil reservoir, and said means defining a restricted passageway includes a predetermined diametral clearance between the exterior wall of said seat and that portion of the interior wall of said cavity in which said seat is located, said diametral clearance providing a passageway between said inlet and said reservoir.
Claim 4
Dependent Claim
43 words
The improved tappet as defined in claim 2, wherein a nonmetering passageway means is provided in conjunction with the said push rod seat and said means for supporting said push rod seat whereby oil flows therethrough into said reservoir from said diametral clearance.
Claim 5
Dependent Claim
21 words
The improved tappet as defined in claim 3, in which the nonmetering passageway means includes two nonmetering passageways positioned 180* apart.
Claim 6
Dependent Claim
48 words
The improved tappet as defined in claim 1, wherein said means defining a restricted passageway includes a disc positioned on said seat support between said seat and said seat support, and a metering slot means is provided on the surface of said seat in contact with said disc.
Claim 7
Dependent Claim
27 words
The improved tappet as defined in claim 5, and further including at least on nonmetering passageway extending inwardly from said exterior seat wall to said metering slot.
Claim 8
Dependent Claim
36 words
The improved tappet as defined in claim 5, and further including biasing means for constantly biasing said seat surface against said disc to prevent separation, such as caused by lash, of said seat from said disc.
Claim 9
Dependent Claim
28 words
The improved tappet as defined in claim 7, wherein said biasing means includes a resilient retainer, and said cavity includes means for restraining said retainer from axial movement.
Claim 10
Dependent Claim
37 words
The improved tappet as defined in claim 8, wherein said restraining means includes a groove in said cavity interior wall into which said retainer is snapped, whereby said retainer prevents separation of said seat from said disc.
References Cited (Backward Citations)
US2797673A
Cited
US2874685A
Cited
US3059627A
Cited
US3151603A
Cited
US3291107A
Cited
US3358658A
Cited
US3448730A
Cited
US3450228A
Cited
US3437080A
Cited
US3498273A
Cited
US3516393A
Cited
US3470983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |