Expansible chamber devices – Relatively movable working members – Moving cylinders
Patent
1993-06-14
1994-08-30
Denion, Thomas E.
Expansible chamber devices
Relatively movable working members
Moving cylinders
92 78, 92 75, 92117R, 92111, 92151, 92165PR, 92166, 91216R, 91216A, 91217, F01B 1500
Patent
active
053417259
ABSTRACT:
A power cylinder (10) has two pistons (12, 20) slidably mounted within separate cylinders (14, 22) to define inner and outer chambers (16, 18; 24, 26) within each cylinder. One or more rods (28) are coupled between the pistons. The outer chambers (18, 26) are coupled together to allow pressurized hydraulic or pneumatic fluid to flow therebetween. The inner chambers (16, 24) are coupled together to allow pressurized hydraulic or pneumatic fluid to flow therebetween. The fluid flow aforesaid may be achieved by using two hollow rods (128, 130) and allowing the fluid to flow through the rods between the respective chambers. A guard (44) may surround first and second cylinders (14, 22). Bearings (46, 48) may be fixed around the opposed inner ends of cylinders (14, 22) to allow slidable displacement of the cylinders relative to guard (44). Seals (146, 148) may be fixed around the opposed inner ends of cylinders (114, 122) to provide a hydraulic chamber (158) enclosed by the guard (144) between the cylinders (114, 122). Where two rods interconnect the dual cylinders, the first piston (212) may be connected to the second cylinder (222) and the first cylinder (214) may be connected to the second piston (220).
REFERENCES:
patent: 1845797 (1932-02-01), Kearney
patent: 2483239 (1949-09-01), Sharpe
patent: 2832317 (1958-04-01), Henry
patent: 3097572 (1963-07-01), Macy
patent: 3162365 (1964-12-01), Gizeski
patent: 3187637 (1965-06-01), Edmund
patent: 3877349 (1975-04-01), Schindel
patent: 4526086 (1985-07-01), Holton et al.
patent: 5111733 (1992-05-01), Baraniak
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