Keyless chuck
Patent 4848779 Issued on July 18, 1989. Estimated Expiration Date: 
April 2, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 2, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2406444 2683041 3350108 3506277 3545776 3599999 3712633 Drill chuck Nonloosening drill chuck Keyless self-tightening chuck InventorsAssigneeApplicationNo. 07/033328 filed on 04/02/1987US Classes:279/60, Obliquely guided reciprocating jaws279/65, Reciprocating jaw advancing sleeve279/902KEYLESS TYPE SOCKETExaminersPrimary: Bishop, Steven C.Attorney, Agent or FirmInternational ClassB23B 31/12 (20060101)AbstractA 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.Other References
| |
