Selftightening drill chuck
Patent 4836563 Issued on June 6, 1989. Estimated Expiration Date: 
May 13, 2008. 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.
May 13, 2008. 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 1668317 Tool chuck Nonloosening drill chuck Drill chuck Locking drill chuck with protection against overtightening Lockable and self-tightening hammer-drill chuck Patent #: 4700956 InventorApplicationNo. 07/194411 filed on 05/13/1988US Classes:279/63, Threaded central cone and jaw279/134, SEPARATE CHUCK-ACTUATING POWER SOURCE279/19.3, Rotary socket279/60, Obliquely guided reciprocating jaws279/902KEYLESS TYPE SOCKETExaminersPrimary: McGlynn, Joseph H.Assistant: Bishop, Steven C. Attorney, Agent or FirmInternational ClassB23B 31/12 (20060101)Foreign Application Priority Data1987-08-14 DEAbstractA selftightening drill chuck has a chuck body having a chuck thread, a chuck sleeve, a plurality of clamp jaws which are guided slidably in the chuck sleeve inclined to the chuck axis and a locking ring on the chuck body which is rotatable between two rotational end positions and is axially slidable and is coupable in the circumferential direction with the clamping sleeve by two tooth rings. The chuck body has a conical surface extending parallel to the feed direction of the clamp jaws on which the chuck thread is located which engages with a transverse gear on each clamp jaw. A spring acts on the locking ring in a rotational direction which corresponds to the opening of the drill chuck. To limit rotation of the locking ring a stop pin fixed on the chuck body can be provided which engages in a cavity of the locking ring. | |
