Importance

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Abstract

A vise has a stationary jaw, a movable jaw, an outer hollow high-speed spindle threaded in the fixed jaw and formed with a radially open entrainment recess, and an inner low-speed spindle threaded in the outer spindle. A hand crank is rotationally fixed on an 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 spindle to an outer spindle and a freeing position clear of the recess and permitting relative rotation of the spindles. A switching piece on the inner spindle can operate a bolt to press the operating bolt into the camming surface in a low-speed position of the switching piece and thereby pull the entrainment pin out of the recess to decouple the spindles and in a high-speed position frees the operating bolt from the camming surface and couples the spindles to each other. A stop collar rotatable and axially displaceable on the outer spindle has a front face engageable directly with the movable jaw and a back face formed with a plurality of pairs of diametrally opposite notches of different depths. The switching piece is selectively engageable in the pairs of notches so that the collar limits displacement of the switching piece axially forward toward the movable jaw by distances depending on which pair of notches the switching piece is engaged in and the distances correspond to respective clamping forces.

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First Claim