Punch and die adapter
Patent 4594779 Issued on June 17, 1986. Estimated Expiration Date: 
November 1, 2004. 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.
November 1, 2004. 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 2735489 Staked bearing cutter Draw punch Patent #: 4403417 InventorAssigneeApplicationNo. 06/667253 filed on 11/01/1984US Classes:30/360With portion positioned in work apertureExaminersPrimary: Schran, Donald R.Attorney, Agent or FirmInternational ClassesB21D 28/34 (20060101)B26F 1/38 (20060101) AbstractThe adapter member includes a threaded male portion adapted for threadable engagement in a threaded bore of the punch and a threaded female portion of smaller diameter adapted for threadable engagement with a small diameter threaded end of the draw stud which can pass through an initial small diameter pilot hole in the workpiece. The adapter member allows the punch to accommodate a draw stud of sufficiently small diameter to fit through the pilot hole and allows punching of a larger diameter hole in light gage or non-ferrous materials without enlarging the pilot hole. This arrangement eliminated the need in the past for the additional step of enlarging the pilot hole to accept a draw stud of larger diameter that was threaded directly into the thread bore of the punch for punching larger diameter holes in both heavy and light gage material. | |
