Tool driving or impacting – Automatic control of power operated means – Drive means responsive to torque or speed condition
Patent
1991-09-06
1993-06-08
Yost, Frank T.
Tool driving or impacting
Automatic control of power operated means
Drive means responsive to torque or speed condition
173 93, 91 59, B25B 2314
Patent
active
052170799
ABSTRACT:
A hydro-impulse screwing device comprises a rotary drive motor, a power source for the motor, a drive shaft, a pulsating hydraulic drive connecting the motor to the shaft and a power cut-off for the motor. The load at which the power cut-off functions is adjustable. The tool has a borehole extending through the length of the shaft, a conduit for conducting hydraulic fluid from the drive to the borehole, a valve in the borehole movable from a closed position to an open position in response to hydraulic pressure corresponding to a predetermined load to allow hydraulic pressure from the drive to actuate the power cut-off, a biassing element in the borehole for biassing the valve toward a closed position against the hydraulic pressure, wherein the force of the biassing element is adjusted at the end of the drive shaft to change the load at which the power cut-off operates.
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Anders Heinz-Gerhard
Kettner Konrad K.
Mattheiss Eugen
Cooper Industries Inc.
Rose David A.
Smith Scott A.
Thiele Alan R.
Yost Frank T.
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