Method and apparatus for automatically controlling pressure...

Details Method and apparatus for automatically controlling pressure... Method and apparatus for automatically controlling pressure...

B - Operations, Transporting

66

F

214/13

B66F 9/20 (2006.01)

Patent

CA 1316871

METHOD AND APPARATUS FOR AUTOMATICALLY CONTROLLING PRESSURE IN FLUID-ACTUATED SYSTEMS Abstract of the Disclosure The invention provides a method and apparatus for controlling the level of clamping pressure applied by a clamp (14) to a load (16). A pump (20), whose output is controlled by a normally open valve (34), establishes an initial level of clamping pressure. Through the use of a number of controllable fluid discharge means (50, 52, 54), this pressure is automatically increased in increments depending upon the resistance of the load to the clamping pressure exerted. In apreferred embodiment, the controllable fluid discharge means include discharge cylinders (58, 70, 90) that contain predetermined volumes of fluid dischargeable by free-floating pistons (62, 82, 92) residing therein. The outputs of the discharge cylinders are controlled by pressure-responsive valves (72, 92) to produce the desired relationship between clamp pressure and load rigidity.

572844

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