Method and arrangement for positioning accurately the pistons of

Details Method and arrangement for positioning accurately the pistons of Method and arrangement for positioning accurately the pistons of

1990-03-02

1992-06-30

Look, Edward K.

Motors: expansible chamber type

Position maintaining type

91433, F15B 1316

Patent

active

051253224

ABSTRACT:
A method and an arrangement for positioning accurately the piston of a load-carrying pressure-fluid piston-cylinder device, in which the fluid is a compressible gas and the cylinder device is double-acting. A variable operating pressure (P1) acts on one side of the piston, and an applied pressure (P2) of constant value acts on the other side of the piston. The pressures (P1,P2) can be relieved alternately by evacuation, for movement of the piston in the cylinder device. A pressure regulator is provided which functions to detect the load acting on the cylinder device from an external load (F) and which includes a pressure chamber having a movable wall supporting the cylinder device, and in which the operating pressure (Pi) is applied via a valve, the opening and closing movements of which are determined by movements of the movable wall.

REFERENCES:
patent: 3894476 (1975-07-01), Cobb
patent: 4664019 (1987-05-01), Lipinski et al.
patent: 4664020 (1987-05-01), Kaiser
patent: 4754692 (1988-07-01), Yoshida
patent: 4771674 (1988-09-01), Hugdahl et al.

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