Torque-indicating screwdriver

Details Torque-indicating screwdriver Torque-indicating screwdriver

1990-04-03

1991-09-17

Meislin, D. S.

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

7386221, B25B 23159

Patent

active

050483811

ABSTRACT:
A torque-indicating screwdriver comprises a shaft assembly and a handle. There is also a fastener coupling which enables a fastener to be coupled to an end of the shaft assembly. The shaft assembly comprises a torsionally elastic torque transmitter which is preferably a torsion bar which couples the handle to the fastener coupling. An indicator is also provided and is coupled between the handle and the fastener coupling to provide an indication of the relative torque applied through the torsionally elastic torque transmitter to the fastener coupling by rotation of the handle. In addition, or as an alternative, the indicator may be coupled between the handle and the fastener coupling to provide an indication of the peak torque applied through the torsionally elastic torque transmitter to the fastener coupling by rotation of the handle so that the indicator remains at the peak indication until it is reset.

REFERENCES:
patent: 2394022 (1946-02-01), Storrie
patent: 2400978 (1946-05-01), Collins
patent: 2417402 (1947-03-01), Storrie
patent: 2464372 (1949-03-01), Booth
patent: 3783682 (1974-01-01), Lipari
patent: 4249435 (1981-02-01), Villeneuve et al.
patent: 4461491 (1984-07-01), Booth

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