B - Operations – Transporting – 30 – B
Patent
B - Operations, Transporting
30
B
121/68, 138/80.1
B30B 1/32 (2006.01) F15B 3/00 (2006.01) F15B 11/042 (2006.01) F15B 11/044 (2006.01) F15B 13/00 (2006.01)
Patent
CA 1065229
ABSTRACT OF THE DISCLOSURE She present invention relates to a control device for the speed control of pneumatic or hydraulic power pistons and machine elements driven by such power pistons, wherein the control of the power piston speed is effected over at least part of the path of movement of said machine element by fluid pressure, said control device comprising a first hydraulic or pneumatic circuit containing a transducer coupled to the machine element or power piston so as to convert its motion into flow of fluid in said first circuit, a second hydraulic or pneumatic circuit containing a throttling arrangement adapted to throttle fluid flowing in a third hydraulic or pneumatic circuit, said fluid in said third circuit driving said power piston, the fluid flow in said second circuit varying the degree of throttling produced by said throttling arrangement, and a pressure and volume converter having a variable transmission ratio coupling said first and second circuits, whereby said transducer controls said throttling arrangement under the modifying action of said pressure and volume converter.
279868
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