Mechanical property testing machine

Details Mechanical property testing machine Mechanical property testing machine

1989-04-04

1990-03-20

Myracle, Jerry W.

Measuring and testing

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

Specimen clamp, holder, or support

73833, G01N 304

Patent

active

049090852

ABSTRACT:
In accordance with the present invention an improved alignment assembly is provided wherein when a threaded fastener is the test specimen, the fastener is gripped by a collet made of two longitudinally split, threaded, and tapered pieces held together with a spring. As a load is applied to the specimen, the two collet pieces are locked together by the tapers, assuring thread alignment. The split collar also preferably has different threads per inch at each end of the collet pieces to adapt to different threads of different specimens. Split collars of different geometry are used to test thin, non-threaded specimens. In a preferred embodiment, a reversible washer in which a first face is used to hold the fastener in place and in alignment in a first test, is also used to test the elongation of the fastener in a separate test, through the use of a second tapered face.

REFERENCES:
patent: 1122289 (1914-12-01), Loveland

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