Stock lifter for metal forming dies and method for making...

B - Operations – Transporting – 21 – J

Patent

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B21J 11/00 (2006.01) B21D 35/00 (2006.01) B21D 37/08 (2006.01) B21D 45/00 (2006.01)

Patent

CA 2501893

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.

L'invention concerne un dispositif de levage autonome s'utilisant en particulier dans des matrices de formage progressif de métaux à postes multiples et analogue, et qui comprend une plaque de base comportant deux trous traversants verticaux adjacents à des côtés opposés, et une ouverture d'unité ressort vertical se situant entre lesdits trous. Le dispositif de levage comprend une barre de levage comportant deux trous traversants verticaux alignés sur les trous traversants de la plaque de base. Deux arbres de guidage rigides sont montés dans les trous traversants de la plaque de base pour imprimer à la barre de levage un mouvement de va-et-vient afin de lever sélectivement les matériaux dans la matrice et de les déplacer dans le sens longitudinal, le long des multiples postes de la matrice. Une unité ressort comporte une base retenue dans l'ouverture de l'unité ressort, et une tige sollicitée vers l'extérieur qui est animée d'un mouvement de va-et-vient. Une extrémité libre touchant une partie centrale de la barre de levage permet de déplacer ladite barre dans une position déployée.

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