Air wrench

Details Air wrench Air wrench

1987-11-12

1989-07-11

Yost, Frank T.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

81467, B23Q 500

Patent

active

048462853

ABSTRACT:
An air wrench, with a compressed air motor, a wrench head and a gearing for transferring the power of the motor to the head, as well as a control mechanism, which comprises at least one adjustable pressure reducer for limiting the torque and which permits the wrench to be switched on and off manually by opening and closing a main air valve in the compressed air line to the motor of the wrench. The control mechanism has a triggering device which, as the pressure in the compressed air line to the motor of the wrench rises from the dynamic pressure while the compressed air motor is running to the static pressure while the motor is braked or obstructed as a result of having reached a particular torque, for example, when tightening a bolt, stops the supply of compressed air to the motor of the wrench,

REFERENCES:
patent: 2130111 (1938-09-01), Whitney et al.
patent: 3827506 (1974-08-01), Himmelstein et al.
patent: 4006784 (1977-02-01), Dudek
patent: 4244434 (1981-01-01), Wilson

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