Torque limiting screw-tightening tool

Details Torque limiting screw-tightening tool Torque limiting screw-tightening tool

1987-11-24

1989-05-30

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

81475, 81473, B25B 23157

Patent

active

048339520

ABSTRACT:
A power-operated tool is fitted with a drive, whose driving shaft can, by means of a connecting coupling whose actuation depends on the reaction torque, be coupled with a driven shaft. The connecting coupling first interrupts transfer of the torque to the driven shaft, so that, in spite of the running drive, no torque can be transferred to the driving shaft. Immediately afterwards, the drive is disconnected. As a result of this sequence of disconnections, the motor, which continues running, can no longer have any influence on the work in progress so that the fastener being tightened does not reach the point of plastic deformation.

REFERENCES:
patent: 2724299 (1955-11-01), Amtsberg
patent: 2728252 (1955-12-01), Connell
patent: 2884103 (1959-04-01), Connell
patent: 2963134 (1960-12-01), Banner

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