Metal deforming – With means to drive tool – Including link-actuated tool support
Patent
1975-10-29
1977-09-06
Larson, Lowell A.
Metal deforming
With means to drive tool
Including link-actuated tool support
72389, 7245303, B21D 706
Patent
active
040459950
ABSTRACT:
A fluid-mechanical drive for a press brake incudes two lever members, pivotally connected between their opposite ends to two corresponding end frame members of the press brake. A pair of hydraulic cylinders pivotally connect one end of each lever member to the upper blade at spaced positions,. The opposite end of each lever member is mechanically connected to the upper blade so that upon simultaneous extension of the two fluid cylinders, a direct downward force is applied to the upper blade at two spaced positions along the blade by such cylinders and a downward reaction force is applied through the lever members and mechanical means to the upper blade at two other spaced positions along the blade to drive such blade downwardly through its working stroke into coaction with a lower blade. In one embodiment, the mechanical means are link members, each pivoted at one end to the upper blade and at the other end to a lever member. In another embodiment, the mechanical means is an eccentric formed as the opposite end of each lever member, with the eccentric being offset from the pivot axis of the lever member and operating within a recess of an upper extension of the upper blade.
REFERENCES:
patent: 542190 (1895-07-01), Guild
patent: 738787 (1903-09-01), Fogarty
patent: 2738748 (1956-03-01), Hecht
patent: 2890649 (1959-06-01), Hodges
patent: 3587286 (1971-06-01), Fritsch
Crosby Gene P.
Larson Lowell A.
Steel Structures, Inc.
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