Dual speed hydraulic piston assembly

Details Dual speed hydraulic piston assembly Dual speed hydraulic piston assembly

F - Mech Eng,Light,Heat,Weapons

15

B

138/62

F15B 15/17 (2006.01) F15B 11/024 (2006.01) F15B 15/20 (2006.01)

Patent

CA 1139186

DUAL SPEED HYDRAULIC PISTON ASSEMBLY Abstract of the Disclosure Liquid fluid pressure applied to a piston causes advancement thereof at a rapid rate until an external resisting load applied to the piston rod exceeds a predetermined value producing a corresponding increase in the pressure within the opposing pressure chambers to which the piston is exposed. Bi- directional flow, conducted between the opposing chambers during rapid piston movement, is automatically blocked by a differential circuit pressure operated piston valve to cause a rapid increase in the differential pressures acting on the piston, and an increase in the value of the external piston rod load with a corresponding decrease in its rate of movement in the same direction. A modified embodiment permits the piston rod to act under pressure and with a force in both the extending and retracting phases of the stroke with the same rapid extending rate until the external resisting force is encountered.

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