Inventors:
Joel T. Pyper - Grand Rapids MI, US
John K. Pyper - Grand Rapids MI, US
Scott M. Breen - Grand Rapids MI, US
Charles T. Brown - Grand Rapids MI, US
Jeffery S. Pyper - Grand Rapids MI, US
Assignee:
Pyper Tool & Engineering, Inc. - Grand Rapids MI
International Classification:
B21D 43/05
Abstract:
A self-contained stock lifter is particularly adapted for use in multiple station, progressive metal forming dies and the like, and includes a base plate with two vertical through holes adjacent opposite sides, and a vertical spring unit aperture located between the through holes. The stock lifter also includes a lifter bar having two vertical through holes in vertical registry with the base plate through holes. Two rigid guide shafts are mounted in the base plate through holes to permit the lifter bar to reciprocate in a manner which selectively lifts stock in the die to permit longitudinal shifting of the stock along the multiple die stations. A spring unit has a base retained in the spring unit aperture, and a reciprocating rod biased outwardly, with a free end abutting a central portion of the lifter bar to shift the lifter bar to an extended position, thereby defining a fully self-contained unit that can be readily mounted in and removed from the die to reduce manufacturing and repair costs.
