B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
29/1, 164/120, 1
B21D 5/12 (2006.01) B26D 5/12 (2006.01) B26D 7/26 (2006.01)
Patent
CA 1259786
Abstract An apparatus for performing two successive work operations on a workpiece in an equalized force mode. The apparatus includes a base; a yoke mounted for bi-directional movement on the base and carrying a two- sided punch on its upper face; a ram member mounted within the yoke and including two bores opening in opposite faces of the ram member and slidably receiving two pistons secured to the opposite end walls of the yoke; and means for delivering pressurized fluid through the pistons to sealed pressure chambers defined at the inner ends of the pistons between the piston inner ends and the respective confronting faces of the ram to selectively move a pair of die members carried on the upper face of the ram into and out of punching coacting with the double punch carried on the yoke. A force balance system acts to initially move the ram on the yoke in response to the introduction of pressurized fluid to either sealed chamber whereafter, upon engagement of suitable stop means, the pressure fluid acts to move the yoke on the base in a complimentary direction to bring one of the punches into coaction with one of the die members whereafter the pressure fluid is routed to the other sealed chamber and a similar sequence follows to achieve the second punching operation involving the double punch and the other die member.
532921
Obrecht Robert E.
Waltonen Edward J.
Lamb Robo
Ridout & Maybee Llp
LandOfFree
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