Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specimen clamp – holder – or support
Reexamination Certificate
2005-03-08
2005-03-08
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specimen clamp, holder, or support
C073S760000, C073S168000
Reexamination Certificate
active
06862940
ABSTRACT:
A portable electro-hydraulic test bed apparatus with analog control station and methodology for performing hands-on materials and components testing. A portable test bench is provided having a hydraulic pump and a reservoir of hydraulic oil. The pressurized hydraulic fluid flows through a pressure relief valve, filter, and ball valve to a servo control valve. The servo control valve controls the action of the hydraulic ram. Any return hydraulic fluid flows through check valve, filter, and heat exchanger back to the reservoir. The servo control valve with the hydraulic ram may be moved to the location where the test is to occur. Whenever the hydraulic ram is moved to a different location displacement interlock is also required. The hydraulic ram is anchored at one end and the test is performed on the test item with the other end of the ram. A displacement sensor is included to determine how much the test item is being displaced. In addition, a load cell is included to determine the load that is exerted on the test item. A portable analog control station is provided.
REFERENCES:
patent: 3151478 (1964-10-01), Heldenbrand
patent: 3577768 (1971-05-01), Aprill et al.
patent: 4480462 (1984-11-01), Miller
patent: 5079707 (1992-01-01), Bird et al.
patent: 5115407 (1992-05-01), Bird et al.
patent: 5198980 (1993-03-01), Patrick
patent: 6349601 (2002-02-01), Losee
Ellington Alandra
Evans Michelle
Gunn & Lee , P.C.
Lefkowitz Edward
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