Workpiece-deforming tool and die for use in a punch press
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United States of America Patent
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Nov 19, 1996
Issued Date -
N/A
app pub date -
Jan 9, 1995
filing date -
Jan 12, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A self-locking workpiece-deforming tool for use in mechanical punch presses in which the ram cannot maintain continuous pressure against the tool in a depressed position. The tool includes an elongated punch guide having an interior surface defining a chamber extending therethrough. A punch body having upper and lower segments is partially received within the chamber for reciprocable axial movement with respect to the guide between raised and depressed positions. A lower segment of the punch body carries a rotatable workpiece-deforming roller. The punch assembly includes a positioning device for sustaining the body and the roller in a depressed position without requiring the ram of the press to exert continuous downward pressure on the tool. The positioning means locks the body in the roller in the depressed position upon a momentary strike by the ram, and releases the body and roller upon subsequent momentary strike by the ram.
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