Bolt stretch measurement device

Details Bolt stretch measurement device Bolt stretch measurement device

1982-04-30

1984-06-19

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Machine

73761, 81470, B25B 2902, F16B 3102

Patent

active

044547900

ABSTRACT:
An apparatus for measuring mechanical strain in a bolt, stud or other tensile member includes a measuring rod which is held in a fixed position with respect to a selected point in an axial bore in the tensile member being measured. A bolt extension tube extends into the axial bore to provide a wrench support function and is held in a fixed position with respect to a second point on the tensile member. Straining the tensile member results in a relative displacement between the rod and the tube which is proportional to tensile member elongation. Means are provided for setting a preselected strain, measuring strain, displaying strain and providing a control signal to control straining of the tensile member.

REFERENCES:
patent: 3722332 (1973-03-01), Jones
patent: 3759090 (1973-09-01), McFaul et al.
patent: 3837694 (1974-09-01), Frisch et al.
patent: 3877326 (1975-04-01), Kock et al.
patent: 3943819 (1979-03-01), Charron
patent: 3969810 (1976-07-01), Pagano
patent: 3969960 (1976-07-01), Pagano
patent: 4062227 (1977-12-01), Heyman
patent: 4185505 (1980-01-01), Exner et al.

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