Extensometer

Details Extensometer Extensometer

1982-08-26

1984-08-21

Martin, Jr., William D.

Measuring and testing

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

Threaded fastener stress

33147D, 33125B, 33172R, F16B 3102

Patent

active

044662912

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 the 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 the first and second members, respectively. A dial gauge (0.01 mm divisions), which co-operates with a datum block on the lower bracket, is mounted on the upper bracket. With the extensometer in position, the spring is stressed by relatively moving the first and second members to position the second abutment formation below the lower shoulder in the stud. A plunger member is moved relative to the second member to expand the spring fingers thereof outwardly. The spring is allowed to relax and pull the second abutment formation into contact with the stud shoulder. The dial gauge can be then read.

REFERENCES:
patent: 2995033 (1961-08-01), Stifano
patent: 3943819 (1976-03-01), Charron
patent: 4300397 (1981-11-01), Kempen

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