B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
29/19, 77/28
B23B 31/12 (2006.01)
Patent
CA 1281538
KEYLESS CHUCK AND METHOD THEREFOR ABSTRACT OF THE DISCLOSURE A keyless chuck includes a jaw housing with jaws that are advanced in respective guideways to grip a tool bit and retracted to loosen the grip on the tool bit. A jaw thrust member is coupled to the jaws and to a threaded spindle and is forced forwardly or rearwardly to advance or retract the jaws. The threaded chuck spindle engages the jaw thrust member through a small-area contact patch to limit the operating friction and thus provide a chuck which can be readily hand-tightened and which self-tightens in response to torque transmitted through the chuck. A lock mechanism is provided to selectively lock a chuck adjusting sleeve relative to the jaw housing to allow uni-directional movement of the chuck adjusting sleeve relative to the jaw housing or selective bi-directional locking of the chuck adjusting sleeve relative to the jaw housing. The lock mechanism includes a lock plate coupled to a chuck adjusting sleeve and includes a set of teeth on an axial face for engagement with complementary teeth on an axial face of the chuck adjusting nut. The lock plate is normally spring-biased into engagement with the chuck adjusting nut and can be disengaged from the chuck adjusting nut to temporarily disable the locking mechanism. The keyless chuck is assembled in such a way that the run-out of the finished chuck is minimal.
547876
Coleman Charles W.
Wheeler Dale K.
Black & Decker Inc.
Gowling Lafleur Henderson Llp
LandOfFree
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