US3797303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biaxial compression-testing machine
Assignee: Bpifrance Financement SA
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Filing: 1972-11-28
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Granted: 1974-03-19
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Expires: 1992-11-28
Abstract
Abstract The machine comprises two compression assemblies, each of which is called upon to apply a monoaxial compression load to the test piece in a direction horizontal and perpendicular to the load applied by the other assembly and coplanar therewith; each assembly includes a jack, the body of which is integral with the frame, and a piston applying pressure to a vertical plate adapted to apply a load to one surface of the test piece; an opposing vertical plate, coaxial with the first plate, is connected to the frame for applying to the opposite parallel surface of the test piece a load of modulus equal to the load applied by the first plate and in opposite direction thereto. The machine is characterized in that each compression assembly is carried, independently of the other assembly, on guide means having little friction and making it possible for the assembly to move freely in a horizontal direction, parallel with the direction of application of the load by the assembly; the guide means associated with the other assembly similarly making it possible for the latter to move in a direction parallel with the direction of application of the load by the other assembly and at right angles to the direction of movement of the first assembly.
Inventors
- 👤 J Moulis
- 👤 A Bascoul
- 👤 J Bourdes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:13
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/08; G01N2203/00; G01N2203/02; G01N2203/025; G01N2203/0254
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
243 words
A biaxial compression-testing machine which makes it possible to subject a test piece in the form of a right-angled parallelepiped to a biaxial field of compression stresses, said machine comprising two compression assemblies, each of which is called upon to apply a monoaxial compression load to the test piece in a direction horizontal and perpendicular to the load applied by the other assembly and coplanar therewith, each of said assemblies comprising a jack having a body integral with a frame and a piston to apply pressure to a vertical plate adapted to apply a load to one surface of the test piece; an opposing vertical plate coaxial with said first plate and connected to said frame for applying to the opposite parallel surface of the test piece a load of modulus equal to the load applied by said first plate and in the opposite direction thereto, said test machine being characterized in that each compression assembly is carried, independently of the other assembly, on guide means having little friction, said guide means making it possible for the assembly to move freely in a horizontal direction, parallel with the direction of application of the load by said assembly, the guide means associated with the other assembly similarly making it possible for the latter to move in a direction parallel with the direction of application of the load by said other assembly, and at right angles to the direction of movement of said first assembly.
Claim 2
Dependent Claim
243 words
A biaxial compression-testing machine which makes it possible to subject a test piece in the form of a right-angled parallelepiped to a biaxial field of compression stresses, said machine comprising two compression assemblies, each of which is called upon to apply a monoaxial compression load to the test piece in a direction horizontal and perpendicular to the load applied by the other assembly and coplanar therewith, each of said assemblies comprising a jack having a body integral with a frame and a piston to apply pressure to a vertical plate adapted to apply a load to one surface of the test piece; an opposing vertical plate coaxial with said first plate and connected to said frame for applying to the opposite parallel surface of the test piece a load of modulus equal to the load applied by said first plate and in the opposite direction thereto, said test machine being characterized in that each compression assembly is carried, independently of the other assembly, on guide means having little friction, said guide means making it possible for the assembly to move freely in a horizontal direction, parallel with the direction of application of the load by said assembly, the guide means associated with the other assembly similarly making it possible for the latter to move in a direction parallel with the direction of application of the load by said other assembly, and at right angles to the direction of movement of said first assembly.
Claim 3
Dependent Claim
47 words
A testing machine according to claim 1, characterized in that said guide means associated with each assembly consist of horizontal rails, the axes of which are parallel with the loading direction of the assembly, the frame of said assembly being supported on said rails by rolling means.
Claim 4
Dependent Claim
38 words
A testing machine according to claim 2, characterized in that the said rails are located on three ball-joints arranged in the form of a triangle and each mounted on height adjusting means supported on a substantially horizontal base.
Claim 5
Dependent Claim
114 words
A testing machine according to claim 1, wherein the frame of each compression assembly consists of rigid horizontal columns arranged in parallel with the loading direction of said assembly and jointing together two rigid plates located in the vicinity of each end of said columns, the jack body being attached to one of said plates and the opposing plate to the other, said machine being characterized in that each plate is carried on said columns on low-friction sliding means enabling it to move freely in a direction parallel with said columns thereby acting as guides therefor, the end of the jack piston being adapted to apply pressure to the central area of said plate.
Claim 6
Dependent Claim
40 words
A testing machine according to claim 4, characterized in that the plate in each assembly is connected to said columns by means of variable-length arms, said arms being equipped with means for adjusting the length thereof for centering said plate.
Claim 7
Dependent Claim
51 words
A testing machine according to claim 4, characterized in that a load sensor, attached to the plate in each assembly, is interposed between said plate and the end of the jack piston, said sensor serving to transFer to the plate the forces exerted by the piston and to measure said forces.
Claim 8
Dependent Claim
71 words
A testing machine according to claim 1, designed for testing concrete test pieces, said machine being characterized in that the elements of one of the compression assemblies are of dimensions enabling it to apply a maximal predetermined load to the test piece, while the elements of the other assembly are of dimensions enabling it to apply a maximal load of the order of half of that applied by the first assembly.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |