US3680367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multispecimen fatigue cracking machine
Assignee: United States Department of the Navy
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Filing: 1971-03-24
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Granted: 1972-08-01
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Expires: 1991-03-24
Abstract
Abstract This disclosure is directed to a machine for inserting fatigue cracks in up to eight specimen at once while allowing independent observation and stress control of each specimen. Eight specimen are fixed in a circular arbor and means is provided for repetitively flexing the specimen to cause cracks to initiate and grow from the root of a notch to a desired depth.
Inventors
- 👤 Joseph M Krafft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:12
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/32; G01N2203/00; G01N2203/0014; G01N2203/0023; G01N2203/0058; G01N2203/006; G01N2203/0062; G01N2203/02; G01N2203/022; G01N2203/0222; G01N2203/026; G01N2203/0262; G01N2203/027; G01N2203/04; G01N2203/0464; G01N2203/0476
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
A multispecimen fatigue cracking device, which comprises: a specimen assembly means adapted for holding a plurality of elongated specimen, said specimen assembly includes a fulcrum centrally of the length of each of said specimen, means for securing said specimen on said specimen assembly, means for depressing and holding one end of each of said specimen in a depressed position, and means for sequentially depressing and relaxing the opposite end of each of said specimen, whereby each of said specimen are repetitively flexed thereby causing cracks to initiate and grow in each of said specimen.
Claim 2
Dependent Claim
94 words
A multispecimen fatigue cracking device, which comprises: a specimen assembly means adapted for holding a plurality of elongated specimen, said specimen assembly includes a fulcrum centrally of the length of each of said specimen, means for securing said specimen on said specimen assembly, means for depressing and holding one end of each of said specimen in a depressed position, and means for sequentially depressing and relaxing the opposite end of each of said specimen, whereby each of said specimen are repetitively flexed thereby causing cracks to initiate and grow in each of said specimen.
Claim 3
Dependent Claim
39 words
A multispecimen fatigue cracking device as claimed in claim 1; in which, said specimen assembly means is cylindrical with linear slots therein within which said specimen are held and circumferential slots for observing and holding said specimen in place.
Claim 4
Dependent Claim
44 words
A multispecimen fatigue cracking device as claimed in claim 2; in which, said means for sequentially depressing and relaxing one end of each of said specimen includes more than one depressing and relaxing element which revolves about the linear axis of said specimen assembly.
Claim 5
Dependent Claim
20 words
A multispecimen fatigue cracking device as claimed in claim 3; wherein, said depressing and relaxing means is a rotatable wheel.
Claim 6
Dependent Claim
128 words
A multispecimen fatigue cracking device as claimed in claim 4; in which, said specimen securing means includes a retaining ring on the outer end of said specimen assembly means and an idler ring on the inner end of said specimen assembly means, said means for depressing and holding said specimen in a depressed position includes threaded bolts screw threaded through said retainer ring on the outer end of said specimen assembly means, said idler ring on the inner end of said specimen having non-threaded holes therethrough on different radii thereof, a plunger secured in each of said non-threaded holes in for movement within said hole, said plunger positioned to contact the end of said specimen and for movement by said rotatable wheels for depressing and relaxing said specimen.
Claim 7
Dependent Claim
37 words
A multispecimen fatigue cracking device as claimed in claim 5; which comprises, a lock nut on said bolts which lock said bolts in place in order to secure one end of said specimen in a depressed position.
References Cited (Backward Citations)
US2404584A
Cited
US2706907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |