Scroll chuck for lathe
Patent 5141239 Issued on August 25, 1992. Estimated Expiration Date: 
July 1, 2011. 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.
July 1, 2011. 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 3704022 Power operable jaw chuck Power-driven wedge-activated chucks Jaw locking means for lathe chucks Patent #: 4640518 InventorApplicationNo. 723944 filed on 07/01/1991US Classes:279/114, Spiral cam or scroll actuated279/123, Jaws279/125WITH SAFETY FEATUREExaminersPrimary: Bishop, Steven C.Attorney, Agent or FirmForeign Patent References
International ClassB23B 031/163AbstractAn improved scroll chuck for holding a workpiece in a lathe including a jaw holder having a front side and a rear side, radially extending slots in the front side and means for attaching the holder to the lathe for turning about a central axis. Two or more jaw devices are mounted in the slots and are radially movable therein. A scroll member is rotatably mounted on the holder and has a spiral-shaped rib formed on a front surface thereof. This rib extends along recesses formed on the jaw devices whereby rotation of the scroll member causes the jaw devices to move in the radial direction. A pin member is arranged on one of the jaw devices and extends from a rearwardly facing surface of the device and into an elongate recess formed in the holder. This pin member prevents the jaw device from accidentally disengaging from the holder.Other References
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