Load multiplying mechanisms
OwnerGordon L. McGlennoninventor
Life of this patent
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Abstract
A pneumatically operated press in which the moving press plunger (13) is actuated by a toggle linkage (20, 21, 22) which is itself actuated by a second toggle linkage (30, 31, 32). The end link (31) of this second linkage is actuated by a large diameter pneumatic ram (34) while the pivotal point (32) of this second toggle linkage is connected to a relatively small diameter pneumatic ram (36), or some other actuator. An automatic switch (42, 32) engages a valve to admit air to the larger ram (34) when the smaller ram (36) has moved the second toggle (30, 31) into an in-line position. The ram (36) may be replaced by a manual operating lever.
Claims11
A power operated press including a frame having a base with worktable, means to support a plunger for movement towards and away from the worktable, and means for actuating the plunger including a first toggle linkage comprising two links pivotally interconnected at an articulated joint, the links being respectively connected pivotally to the frame and the plunger, and a second toggle linkage comprising two further links pivotally interconnected at an articulated joint, one of the said further links being connected to the joint of the first toggle linkage, and including means for actuating the said toggle linkages to cause movement of said plunger and generate a potential output force thereat, including a main power-operated fluid ram acting on the second of the two links of the second toggle linkage, and a further actuator connected to the articulated joint of the said second toggle linkage.
Dependencies are inferred from the claim text.