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US 5,092,410 AGranted
Adjustable pressure dual piston impulse clutch
AssigneeChicago Pneumatic Tool Company
InventorsWilliam K. Wallace, Knut C. Schoeps
Life of this patent
Estimating the term…
Abstract
A hydraulic torque impulse generator uses a dual piston arrangement to provide impacts to a rotative anvil and automatic shut-off and control apparatus for limiting the pressure without reversing the direction of the driving clutch cage, a pressure venting arrangement permitting one impact per revolution.
Claims10
A hydraulic torque impulse generator comprising, a rotatable anvil having a working implement connection means, and a rear portion,
- a drive member coaxially rotatable with said anvil and comprising a hydraulic fluid chamber in which said rear anvil portion is received, and an impulse clutch arranged between said drive member and said rear anvil portion,
- characterized in that said impulse clutch comprises two radially extending cylinder bores located in said rear anvil portion in a substantially coaxial disposition to each other, two radially acting piston elements sealingly guided in said cylinder bores and defining between them a single pressure chamber, and said drive member being provided with cam means for urging repeatedly and simultaneously, at relative rotation between said drive member and said anvil, said piston elements towards each other against a rapidly increasing fluid pressure in said pressure chamber, thereby accomplishing a transfer of torque impulses from said drive member to said anvil.
An anvil capable of rotative motion, to which a fastening device may be connected for tightening fasteners,
- a rotataive driving unit for providing pneumatic driving power,
- an impulse clutch, including a radially moving piston, operatively connected between the said anvil and driving unit whereby the driving unit driving power is imparted to the anvil,
- characterized in that the piston impulse clutch is cammed (31) and vented (34) so as to provide one impact on the anvil (20) by the piston for each complete revolution of the driving unit.
Dependencies are inferred from the claim text.