Device enabling the immobilizing of a piston in its cylinder

Details Device enabling the immobilizing of a piston in its cylinder Device enabling the immobilizing of a piston in its cylinder

1976-08-02

1978-02-14

Schwadron, Martin P.

Expansible chamber devices

With releasable stop or latch means to prevent movement of...

Means includes element interfitting between working member...

91 44, 92 865, 188 67, 188300, F15B 1526

Patent

active

040732177

ABSTRACT:
A hydraulically or pneumatically controlled device for locking a piston in he bore of its cylinder at any point of its stroke, comprises, mounted on the piston, fluid-tight seals, a series of wedges, and annular jacks incorporated in the piston. The wedges are arranged to move in translation parallel to the axis of the cylinder under the effect of the annular jacks so as to absorb the increase in the radial plays between the piston and the bore of the cylinder on its pressurization. This peripheral extension which is produced between the bottom of the cylinder on its intake side and the fluid-tight end seal of the piston spaced furthest from it, is followed, after the release of the lateral walls of the cylinder, by a retraction of the lateral walls of the cylinder acting on the outer surface of the wedges. The latter exert a grip on the piston thus effecting positive locking by binding of the cylinder and of the piston. The device is useful for stamping presses for immobilizing the plate, or plastics injection presses, as well as jacks for coupling devices between a barge and a tug.

REFERENCES:
patent: 2815736 (1957-12-01), Wright
patent: 2971496 (1961-02-01), Geyer
patent: 3096075 (1963-07-01), Brown
patent: 3150570 (1964-09-01), Johnson
patent: 3150571 (1964-09-01), Frassetto
patent: 3420144 (1969-01-01), Berry
patent: 3470793 (1969-10-01), Hanchen
patent: 3597016 (1971-08-01), Gachot
patent: 3995534 (1976-12-01), Rastetter

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