Brakes – Internal-resistance motion retarder – Having a thrust member with a variable volume chamber
Patent
1989-09-18
1991-01-01
Graham, Matthew C.
Brakes
Internal-resistance motion retarder
Having a thrust member with a variable volume chamber
92167, 188276, 18832217, F16F 920
Patent
active
049811991
ABSTRACT:
A double-rod hydraulic cylinder for an exerciser including a casing, a piston assembly and a universal joint. The piston assembly includes a piston head and two piston rods. Two bearings are respectively fixed to an inner wall of each closed end of the casing. A disk-type spring washer, a washer, an oil seal and a disk-like fixing gasket are arranged respectively in series from each bearing to said piston head. Each of the bearings, the disk-like fixing gaskets, the disk-type spring washers, the washers and the oil seals have a central hole in alignment for the piston rods to pass through. The washers, the oil seals and the gaskets are axially slidable a short distance within the casing. The two disk-like fixing gaskets and the piston head together define a first chamber and a second chamber. Each disk-type spring washer is compressed when the piston assembly axially moves in either direction. The hydraulic cylinder further includes an oil pipe. Respective ends of the oil pipe are communicated to the first chamber and the second chamber adjacent to each disk-like fixing gasket. A valve is provided between the two ends of the oil pipe and the speed of the piston head is controlled by operating a knob provided on the valve.
REFERENCES:
patent: 2196436 (1940-04-01), Briggs
patent: 2537424 (1951-01-01), Rossman
patent: 2553912 (1951-05-01), Gervais
patent: 2771968 (1956-11-01), Mercier
patent: 3446318 (1969-05-01), Duckett
patent: 3547451 (1970-09-01), Long, Jr.
patent: 3972396 (1976-08-01), Bochnack
patent: 4836094 (1989-06-01), Meijer et al.
Dah Ken Industrial Co., Ltd.
Graham Matthew C.
Keaty Thomas S.
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