Rock bolt load sensor

Details Rock bolt load sensor Rock bolt load sensor

1993-10-13

1995-02-28

Williams, Hezron E.

Measuring and testing

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

Threaded fastener stress

411 14, F16B 3102

Patent

active

053926544

ABSTRACT:
A rock bolt load sensor assembly for use to determine the load on a nut screwed onto a bolt embedded in a rock face, the assembly comprising a plurality of spring washers arranged to be mounted on the bolt between the nut and a roof plate, and a sensor comprising an induction coil adapted to be, in use, placed around the washers, the sensor including an indicator coupled to the induction coil whereby in use, the spring washers define an air space which varies in dependence on the load on the bolt and the induction coil provides an electrical indication of variation of the air space and the indicator provides an indication of variation of the load on the bolt.

REFERENCES:
patent: Re30183 (1980-01-01), Popenoe
patent: 3624713 (1971-11-01), Goldberg

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