Torquing tool control circuit

Details Torquing tool control circuit Torquing tool control circuit

1976-03-04

1978-02-21

Staab, Lawrence J.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

73 88F, 73139, B23Q 500

Patent

active

040747727

ABSTRACT:
The control circuit receives a signal from a torque measuring device provided on the tool and determines the proper shut off point for the tool. The circuit controls not only the tool shut off but also the rate of application of torque by employing a pulsing circuit. The circuit is capable of detecting the onset of yield and can accurately and repeatedly set a fastener at a desired point in the plastic region. The onset of yield is detected by differentiating torque with respect to time.

REFERENCES:
patent: 3643501 (1972-02-01), Pauley
patent: 3825912 (1974-07-01), Weise et al.
patent: 3919563 (1975-11-01), Lautier et al.
patent: 3926264 (1975-12-01), Bardwell et al.
patent: 3939920 (1976-02-01), Hardiman et al.
patent: 3962910 (1976-06-01), Spyridakis et al.
patent: 3969960 (1976-07-01), Pagano
patent: 3973434 (1976-08-01), Smith
patent: 3975954 (1976-08-01), Barnich

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