| 摘要 |
A multi jaw rotary chuck for lathes and the like comprising a body having front and rear portions and including a bore, a plurality of spaced jaw guides in the front portion of the body, a plurality of movable master jaw supports for the jaws of the chuck, the jaw guides each having one of the master supports slideably guided thereby, a plurality of actuator plates in the body each mounted in spaced radial planes intersecting and parallel to the axis of the bore and each actuator plate having first, second and third apexes, the first apex of the plate having a hole and including a first dowel pin mounted in the hole and extending outwardly on either side thereof transverse to the plane of the respective plate, the second apex of each plate having a hole and including a second dowel pin mounted in the hole and extending outwardly on either side thereof transverse to the plane of its respective plate and generally parallel to the first dowel pin, pivot means on each of the actuator plates journalled in the body and positioned between its respective first and second dowel pins, a movable arcuate counterweight for each of the actuators operably connected to the first dowel pin and supported on the rear portion of the body, the second dowel pins each operably connected to one of the master jaw supports, a movable draw plug extending into the central bore and including actuator plate engaging means, the third apex of each of the actuator plates operably connected to the actuator plate engaging means, whereby upon moving of the draw plug rearwardly relative to the body, the actuator plates pivot about the pivot means and simultaneously shift the master jaw supports and counterweights to maintain positive grip on work when the body is rotated.
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