Title:
STOCK LIFTER FOR METAL FORMING DIES AND METHOD FOR MAKING THE SAME
Document Type and Number:
WIPO Patent Application WO2004034158
Kind Code:
A3
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 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.
Inventors:
PYPER JOEL T
PYPER JOHN K
BREEN SCOTT M
BROWN CHARLES T
PYPER JEFFREY S
PYPER JOHN K
BREEN SCOTT M
BROWN CHARLES T
PYPER JEFFREY S
Application Number:
PCT/US2003/032027
Publication Date:
September 30, 2004
Filing Date:
October 08, 2003
Export Citation:
Assignee:
PYPER TOOL & ENGINEERING INC (US)
International Classes:
B21D35/00; B21D37/08; B21D45/00; (IPC1-7): B21J11/00
Foreign References:
| US4326402A | 1982-04-27 | |||
| US4282736A | 1981-08-11 | |||
| US2314138A | 1943-03-16 | |||
| US2346297A | 1944-04-11 | |||
| US2616763A | 1952-11-04 | |||
| US3292412A | 1966-12-20 | |||
| US6134938A | 2000-10-24 | |||
| US5931074A | 1999-08-03 |
Other References:
DADCO - Two post direct lift (18 Sept. 2003)
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