Screwdriver with adjustable device to limit transmitted torque

Details Screwdriver with adjustable device to limit transmitted torque Screwdriver with adjustable device to limit transmitted torque

2007-04-03

2007-04-03

Wilson, Lee D. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

C081S473000, C081S476000, C192S056620

Reexamination Certificate

active

11126087

ABSTRACT:
A screwing tool with a device to adjust transmitted torque comprises a handle to introduce a torque to the device, which is borne in the hollow of the handle and a drive shaft as an output element of the torque. On the drive shaft inside the handle, two separate couplings are assembled, having between them a compression spring exerting a spring force against the two couplings. Each coupling comprises a first and a second socket engaging each other by gearings at their opposing faces. The maximum torque at which the torque transmission will be interrupted can be adjusted by an adjustment element wherein the distance between the couplings can be changed, thereby resulting in a change of the tension of the spring exerting a load on the couplings. The teeth of the gearings slide and the sockets rotate relatively to each other and interrupt the torque-transmission if a pre-adjusted torque is exceeded.

REFERENCES:
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Joseph R. Cruse, Jr., Declaration of Prior Invention in the United States in Protest to Cited Publication, Feb. 27, 2006, 2 pages and 2 Sheets Drawings.

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