Rotary expansible chamber devices – Speed controlled – Weight rotates about axially extending axis
Patent
1986-02-18
1988-09-20
Croyle, Carlton R.
Rotary expansible chamber devices
Speed controlled
Weight rotates about axially extending axis
418270, 415503, 173163, 137 53, F01C 2112, G03D 1310
Patent
active
047721863
ABSTRACT:
An improved torque control mechanism for a rotary vane, air motor tool includes acceleration and speed responsive slidable elements positioned in grooves that lie in a plane transverse to the spin axis of the motor and which form an angle with the radii extending from the spin axis. The elements cooperate with a cam plate which operates a fluid supply valve to close off air supply to the tool whenever torque of the tool causes the speed of the motor to decrease below a threshold level. A bypass valve and passage is manually operable to initiate operation of the air motor. An auxiliary low volume, low pressure valve and passage permits an operator to provide minor adjustments of the orientation of the output shaft of the tool. For reverse operation, the speed and acceleration control is eliminated by operation of a reverse operation control mechanism.
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Carey David N.
Pyles Douglas E.
Croyle Carlton R.
Obee Jane E.
The Aro Corporation
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