Work holders – With fluid means – Cylinder-piston means in series with additional positioning...
Patent
1988-09-20
1990-07-10
Hartman, Judy
Work holders
With fluid means
Cylinder-piston means in series with additional positioning...
269 24, 269 27, B23Q 308
Patent
active
049402161
ABSTRACT:
A vise has a stationary jaw, a movable jaw displaceable longitudinally toward and away from the stationary jaw, an outer hollow high-speed spindle threaded in a nut on the fixed jaw and formed with a radially open entrainment recess, and an inner low-speed spindle threaded in the outer spindle. A piston-and-cylinder unit on the movable jaw has primary and secondary pistons respectively engaged by the outer and inner spindles. A hand crank is rotationally fixed on the inner spindle and an entrainment pin is displaceable transversely in the inner spindle between an entrainment position engaged in the recess and rotationally coupling the inner and outer spindles to each other and a freeing position clear of the recess and permitting relative rotation of the inner and outer spindles. This entrainment pin is formed with a longitudinally directed camming surface. A switching piece displaceable on the inner spindle between a high-speed position and a low-speed position can operate a bolt displaceable along the inner spindle and engageable with the entrainment pin and with the switching piece for pressing the operating bolt into the camming surface in the low-speed position of the switching piece and thereby pulling the entrainment pin out of the recess to decouple the spindles and for freeing the operating bolt from the camming surface and coupling the spindles to each other in the high-speed position of the switching piece.
REFERENCES:
patent: 2472783 (1949-06-01), Barrice
patent: 3147002 (1964-09-01), Arnold
Dubno Herbert
Hartman Judy
Peddinghaus Carl U.
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