Apparatus for a cam-based jack assembly for use in...

Details Apparatus for a cam-based jack assembly for use in... Apparatus for a cam-based jack assembly for use in...

2008-11-20

2010-11-09

Noori, Max (Department: 2855)

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Specimen clamp, holder, or support

C073S760000

Reexamination Certificate

active

07827868

ABSTRACT:
A jack assembly, for use in a materials testing system, utilizes both a cam and a resilient push block. The cam, having an progressive eccentric, is situated between the push block and a jaw housing and located partially within a corresponding shallow channel in each such that both channels effectively straddle the cam. The channels accommodate axial rotation of the cam. The push block is formed of a material with an appropriate modulus of elasticity such that bending moments, particularly at ends of the push block and resulting from axial rotation of the eccentric to its top dead-center position, cause the channel in the push block to elastically deform and increasingly and sufficiently deflect against and around the eccentric, thus increasingly pinching the eccentric and securely locking the cam, push block and specimen grip in their proper positions.

REFERENCES:
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patent: 2634487 (1953-04-01), Rogers
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patent: 5202542 (1993-04-01), Ferguson
patent: 6629466 (2003-10-01), Grote et al.
patent: 2002/0166387 (2002-11-01), Grote et al.
patent: 617428 (1949-02-01), None

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