Extensometer

Details Extensometer Extensometer

G - Physics

01

B

73/89

G01B 5/30 (2006.01) G01L 1/04 (2006.01)

Patent

CA 1175678

ABSTRACT An extensometer, for use in determining extensions or creep in studs or bolts for example, has a first tubular member in which slides a tube assembly carrying a second collet-like member. First and second abutment formations on said first and second members, respectively, engage internal shoulders in a stud. Upper and lower brackets which are restrained against separation, by a spring, beyond a datum position, are fixed relatively to said first and second members, respectively. A dial gauge (0.01 mm divisions), which co-operates with a datum block on said lower bracket, is mounted on said upper bracket. With the extensometer in position, the spring is stressed by relatively moving said first and second members to position said second abutment formation below the lower shoulder in the stud. A plunger member is moved relative to said second member to expand the spring fingers thereof outwardly. The spring is allowed to relax and pull said second abutment formation into contact with the shoulder. The dial gauge can be then read. In a modification, said first member can be a collet-like member also. - 20 -

409966

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