Tool holder-spindle connection
Patent 5322304 Issued on June 21, 1994. Estimated Expiration Date: 
April 15, 2013. 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 15, 2013. 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 ReferencesMultiple-part holding arrangement, in particular for concentrically rotating tools Tool holder Tool coupling Mounting device having a conical shank Shank for a tool Patent #: 5201621 InventorAssigneeApplicationNo. 046957 filed on 04/15/1993US Classes:279/103, Drill type409/234With cutter holderExaminersPrimary: Bishop, Steven C.Attorney, Agent or FirmForeign Patent References
International ClassB23B 031/117AbstractA tool holder assembly for connecting a tool to a spindle. The tool holder assembly defines a conical envelope for seating in a conical seat defined by the spindle and an annular clamping surface in surrounding relation to the conical envelope for seating against an annular clamping surface defined by the spindle. The conical envelope is resilient so as to allow simultaneous seating of the conical envelope in the conical seat of the spindle and seating of the clamping surface on the clamping seat of the spindle irrespective of the tolerances between the conical seat and the clamping seat. Several embodiments are disclosed for providing the resiliency to the conical envelope.Other References
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