Metal deforming – With means to drive tool – Including pneumatic- or fluid-actuated tool support
Patent
1987-03-05
1988-04-12
Jones, David
Metal deforming
With means to drive tool
Including pneumatic- or fluid-actuated tool support
72344, 267119, 267122, 267130, 100259, B21D 2402
Patent
active
047366150
ABSTRACT:
The present invention relates to a pneumatic press counterbalance which holds selected parts of a press in the same relative engagement during the return stroke of a ram as during the power stroke of that ram. The counterbalance includes a base plate adapted for connection to a first part of a press. An elongated cylindrical base tube having an open end is mounted on the base plate and has a center axis substantially perpendicular to the base plate. A resilient unconfined tubular bellows for holding air has a pair of opposed ends. The bellows has an elongated tubular resilient sleeve connecting the open ends and formed integral therewith. One of the open ends of the bellows is sealingly connected to the base tube. A first portion of the tubular sleeve surrounds a portion of the base tube. A second portion of the tubular sleeve is connected to the first portion by a fold in the sleeve and has a part surrounding the first portion. A movable plate is connected to the other end of the bellows. The movable plate is connected to a second part of the press movable relative to the first part of the press.
REFERENCES:
patent: 2878012 (1959-03-01), Crites
patent: 3295846 (1967-01-01), Robertson
patent: 3488045 (1970-01-01), Balunas, Jr. et al.
patent: 3511491 (1970-05-01), Kraft
patent: 3667707 (1972-06-01), Mui
patent: 3989232 (1976-11-01), Steinbach et al.
patent: 4597475 (1986-07-01), Lassig et al.
patent: 4657229 (1987-04-01), Thurow
Bozich George J.
Kotynski Robert J.
Smedberg Kenneth L.
Jones David
Smedberg Kenneth L.
Zummer Anthony S.
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