Device for varying a stroke

Details Device for varying a stroke Device for varying a stroke

Filed on

1988-02-17

Date issued

1989-08-22

Examiner

Garrett, Robert E.

Patent Class

Power plants

SubClass

Pressure fluid source and motor

SubSubClass

Pulsator

Other Related Categories

60592, 92 38, 92 60, 92 83, 92 86, 92142, 277 73, 277 74, 277212FB, 2391022, 2395338, F15B 1500

Type

Patent

Status

active

Patent number

048584398

Description

ABSTRACT:
A stroke variable device comprising a large diameter cylinder and a small diameter cylinder which are interconnected to each other. A large diameter piston and a small diameter piston are slidably inserted into the large diameter cylinder and the small diameter cylinder, respectively, and a cylinder chamber is formed between the inner end of the large diameter piston and the inner end of the small diameter piston. A first seal member is arranged to surround the projecting outer end of the large diameter piston, and a second seal member is arranged to surround the projecting outer end of the small diameter piston. One end of the first seal member is fixed to the projecting outer end of the large diameter piston, and the other end thereof is fixed to the housing of the device to form a first hermetically sealed chamber therein. In addition, one end of the second seal member is fixed to the projecting outer end of the small diameter piston, and the other end thereof is fixed to the housing of the device to form a second hermetically sealed chamber therein. The cylinder chamber and both hermetically sealed chambers are filled with oil.

REFERENCES:
patent: 1805802 (1931-05-01), Browne
patent: 3234739 (1966-02-01), Pierce, Jr.
patent: 3423937 (1969-01-01), Wagstaffe
patent: 3751988 (1973-08-01), Reese, Sr.
patent: 3877226 (1975-04-01), Blum
patent: 4463663 (1984-08-01), Hanson, Jr. et al.

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