F - Mech Eng,Light,Heat,Weapons – 16 – J
Patent
F - Mech Eng,Light,Heat,Weapons
16
J
138/90
F16J 10/02 (2006.01) F15B 11/024 (2006.01) F15B 15/20 (2006.01)
Patent
CA 1164770
HYDRAULIC CYLINDER EXTENDING IN THREE FORCE MODES ABSTRACT OF THE DISCLOSURE A multiple mode hydraulic piston assembly employing a regenerative hydraulic circuit which when incorporated in the piston of a hydraulic cylinder and assembled with a pressurized hydraulic source through appro- priate piping and valving, will sequentially permit, restrict, and block liquid flow through the piston and will thus extend its piston rod in multiple force modes, namely a low force rapid extension mode, a moderate force rapid extension mode, and a high force extension mode. In response to fluid pressures within the cylinder chamber the multiple mode piston assembly automatically changes operational modes. First bi-directional flow is provided between opposing chambers, then uni-directional flow is provided from the rod end to the back end chamber, and finally flow between the chambers is blocked; A modified embodiment provides a free motion mode wherein a modest external force can displace the piston in either direction. An additional embodiment provides an arrangement of the elements offset from the geometrical axis of the piston. An embodiment of the foregoing construc- tion provides a double-ended piston rod configuration. 32
394059
Conway John P.
Swabey Mitchell
LandOfFree
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