Chuck with jaws having curved engagement surfaces
Patent 5464231 Issued on November 7, 1995. Estimated Expiration Date: 
June 20, 2014. 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.
June 20, 2014. 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 1621805 2757008 3494627 3595593 3603605 Chuck jaw and spindle alignment attachment Drill chuck for use in percussion drilling Scroll chuck for lathe Patent #: 5141239 InventorApplicationNo. 262229 filed on 06/20/1994US Classes:279/123, Jaws269/268Angular and/or curved jaw faceExaminersPrimary: Bishop, Steven C.Attorney, Agent or FirmForeign Patent References
International ClassB23B 031/16AbstractA chuck for holding a workpiece in a machine such as a lathe including a jaw holder having a front side facing in the direction of the workpiece and radially extending slots in this front side. There is a mechanism for attaching the holder to the machine for turning about a central axis. Several jaw devices are detachably mounted in these slots and are radially movable therein. Each jaw device has an inner workpiece engaging surface that forms a profile when it is viewed from the front of the jaw device in the direction of the central axis. This profile comprises a central concave arc and two similar convex curves located at opposite ends of the concave arc. In a preferred version, the chuck is a scroll chuck having a scroll member rotatably mounted in the holder. The workpiece engaging surfaces can be serrated to increase gripping ability.Other References
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