Retainer for punch and die sets

Cutting – Tool or tool with support – Joint or connection

Patent

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Details

279 97, B26F 114

Patent

active

040967760

ABSTRACT:
A retainer arrangement is disclosed for securing punches, dies or similar machine tool elements within a bore in a tool holder body, the retainer providing for secure and accurately repeatable orientation of the punch or other element within the bore. The retainer comprises a conically tapered pin retainer having a threaded shank portion adapted to be received into a threaded portion of a retainer seat extending into the holder body transversely to the holder bore and having a conically tapered portion partially intersecting the same. The leading end of the tapered pin retainer is tapered to mate with the tapering portion of the retainer seat and with a complementary conical tapered groove formed in the punch shank, to securely retain the punch or other machine element within the holder body, and also to precisely and repeatably orient the same with respect to the holder body bore in receiving the same. The geometry of the mating retainer pin, groove and tapering portion of the retainer seat is such as to insure seating of the pin in the groove to provide firm engagement with the machine tool element. Also disclosed is the alternate provision of opposed pairs of the tapered pin retainers for heavy duty applications or a single retainer for light duty applications. In one embodiment, the axis of the retainer is inclined from the normal to the tool axis to facilitate removal thereof. The punch shank is disclosed as being formed with a series of ratchet cuts formed along the longitudinal length thereof to facilitate removal of the punch by means of a screw driver or similar tool, while the tool holder backing plates are formed with recesses for easy removal from the press arm members.

REFERENCES:
patent: 688860 (1901-12-01), Kay et al.
patent: 939933 (1909-11-01), Trautner
patent: 2378806 (1954-06-01), Stellin
patent: 2801859 (1957-08-01), Kopczynski

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