Patent US3683876A successfully refreshed from Google Patents.
US3683876A
Expired / Lapsed
US
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Sintered metal tappet
Assignee: Precision Engine Products Corp
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Filing: 1970-06-08
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Granted: 1972-08-15
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Expires: 1990-06-08
Abstract
Abstract A hydraulic tappet in which the barrel is formed of powdered metal, sintered and compacted to a density permitting fluid from within the barrel to pass to the barrel exterior to provide lubrication therefor. The cam face of the tappet barrel may be a sintered component infiltrated with a hardening agent, or it may be formed by a cast iron disc suitably attached to the barrel. The cam face may also be a separate sintered metal disc, again suitably attached to the tappet barrel.
Inventors
- 👤 Kenneth W Lesher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:00
CPC Classifications
F; F01; F01M; F01M9/00; F01M9/10; F01M9/104; F01L; F01L1/00; F01L1/20; F01L1/22; F01L1/24; F01L1/245; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49298; Y10T29/49304
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
16 words
The structure of claim 1 further characterized in that the sleeve is formed of sintered metal.
Claim 2
Dependent Claim
24 words
The structure of claim 1 further characterized in that the density of the sleeve is in the area of 6.8 grams per cubic centimeter.
Claim 3
Dependent Claim
23 words
The structure of claim 1 further characterized in that said barrel end portion is formed of sintered metal infiltrated with a hardening agent.
Claim 4
Dependent Claim
26 words
The structure of claim 4 further characterized in that said barrel end portion is infiltrated with a silicon boron material, preferentially positioned adjacent the cam face.
Claim 5
Dependent Claim
26 words
The structure of claim 5 further characterized in that said silicon boron material constitutes approximately 10 percent of the weight of all material in the barrel.
Claim 6
Dependent Claim
25 words
The structure of claim 1 further characterized in that said barrel end portion is formed by a separate cast iron disc attached to the sleeve.
Claim 7
Dependent Claim
30 words
The structure of claim 7 further characterized in that said cast iron disc includes a major portion of iron and relatively minor portions of carbon, silicon, chromium, nickel and molybdenum.
Claim 8
Dependent Claim
34 words
The structure of claim 8 further characterized in that said cast iron disc includes approximately 92.2 percent iron, 3.5 percent carbon, 2.20 percent silicon, 1.10 percent chromium, 0.50 percent nickel and 0.50 percent molybdenum.
Claim 9
Dependent Claim
16 words
The structure of claim 7 further characterized in that said disc is brazed onto said sleeve.
Claim 10
Dependent Claim
17 words
The structure of claim 7 further characterized in that said disc is adhesively secured to said sleeve.
Claim 11
Dependent Claim
26 words
The structure of claim 1 further characterized in that said barrel end portion is formed by a separate disc of sintered metal, attached to the sleeve.
Claim 12
Dependent Claim
30 words
The structure of claim 12 further characterized in that said sintered metal disc includes a major portion of iron and minor portions of carbon, manganese, silicon, chromium, molybdenum and nickel.
Claim 13
Dependent Claim
34 words
The structure of claim 13 further characterized in that said sintered metal disc includes approximately 0.80 percent manganese, 3.0 percent carbon, 2.50 percent silicon, 1.0 percent chromium, 0.50 percent molybdenum and 0.50 percent nickel.
Claim 14
Dependent Claim
28 words
The structure of claim 14 further characterized in that the density of the sintered metal disc, after compaction, is in the area of 5.4 grams per cubic centimeter.
References Cited (Backward Citations)
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Cited
US2939442A
Cited
US2963011A
Cited
US3301240A
Cited
US3502057A
Cited
US3495577A
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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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |