Patent US2950786A successfully refreshed from Google Patents.
Patent US3602041A successfully refreshed from Google Patents.
US3602041A
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US
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Engine wear life measurement
Assignee: United States Department of the Army
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Filing: 1969-05-28
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Granted: 1971-08-31
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Expires: 1989-05-28
Abstract
Abstract A method and apparatus for the measurement of elapsed wear life of internal combustion engines using stress life history gages, (S/N Fatigue Life Gages) and strain amplifiers is disclosed.
Inventors
- 👤 Bruce R Weinert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:09
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/16; G01B7/18; G01M; G01M15/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
64 words
In combination an internal combustion engine, at least one strain gage, said strain gage comprising a grid of conductive work-hardening material which undergoes a finite and permanent change in resistance with repeated loading, means for measuring said resistance and producing an output indicative thereof and wherein said engine has at least one cylinder having one of said strain gages mounted at the base thereof.
Claim 2
Dependent Claim
64 words
In combination an internal combustion engine, at least one strain gage, said strain gage comprising a grid of conductive work-hardening material which undergoes a finite and permanent change in resistance with repeated loading, means for measuring said resistance and producing an output indicative thereof and wherein said engine has at least one cylinder having one of said strain gages mounted at the base thereof.
Claim 3
Dependent Claim
52 words
The combination of claim 1 wherein said engine has a plurality of said cylinders, each of said cylinders has one of said strain gages mounted at the base thereof and including means for averaging the output of said strain gages to provide an overall analysis of the wear life of said engine.
Claim 4
Dependent Claim
83 words
The combination of claim 1 wherein each of said strain gages is mounted upon a strain amplifier, said strain amplifier comprising a bridge-type structure having at least two leg members connected by a crosspiece, said crosspiece having opposing longitudinal recesses therein, said strain gage is mounted between said opposing longitudinal recess at the point of maximum strain on said crosspiece and wherein said engine has at least one cylinder having one of said strain amplifiers and one of said strain gages mounted thereon.
Claim 5
Dependent Claim
62 words
The combination of claim 3 wherein said engine has a plurality of said cylinders, each of said cylinders has at least one of said strain amplifiers and one of said strain gages mounted at the base thereof and including means for averaging said output of said means for measuring resistance to provide an overall analysis of the wear life of said engine.
References Cited (Backward Citations)
US2282826A
Cited
US3272003A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |