Hydraulic device

Details Hydraulic device Hydraulic device

1988-08-01

1990-02-06

Yost, Frank T.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

81463, 81470, B23Q 500

Patent

active

048982482

ABSTRACT:
Method and apparatus for tightening rotatable fastener elements including a source of pressurized fluid, a first rotatable actuator having a rotatable output shaft operable in response to fluid flow through the first actuator, first control to allow the first actuator shaft to operate to a first fluid pressure established by the pressure of the source of pressurized fluid, switching device operable in response to the attainment of the first fluid pressure, to supply pressurized fluid to a second rotating actuator device connected to operate the output shaft through a portion of a rotation in response to the attainment of the first pressure to secure the fastener to a selected torque.

REFERENCES:
patent: 4522269 (1985-06-01), Adman et al.

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