Wrench with controlled tightening

Details Wrench with controlled tightening Wrench with controlled tightening

2006-05-02

2006-05-02

Wilson, Lee D. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

C081S429000, C073S862230

Reexamination Certificate

active

07036407

ABSTRACT:
The invention provides an electronic wrench which includes means for measuring the instantaneous applied torque and means for measuring the instantaneous angle of rotation during tightening. The physical parameters of the screw connection for tightening and a setpoint value for the tightening are initially entered into the wrench via a keypad. During the tightening operation, the processor means calculate the instantaneous traction force on the screw fastener as a function of the measured instantaneous values of torque and angle and as a function of the recorded characteristics of the screw fastener.

REFERENCES:
patent: 4333220 (1982-06-01), Aspers
patent: 4375121 (1983-03-01), Sigmund
patent: 4858312 (1989-08-01), Van Naarden
patent: 5154242 (1992-10-01), Soshin et al.
patent: 6167788 (2001-01-01), Schonberger et al.
patent: 6276243 (2001-08-01), Jenkins
patent: 33 27 964 (1985-02-01), None
patent: 44 04 419 (1995-08-01), None
patent: 1 022 097 (2000-07-01), None
patent: 2 780 785 (2000-01-01), None
patent: WO 98 22263 (1998-05-01), None
patent: WO 00 64639 (2000-11-01), None

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