Multiple chamber coaxial hydraulic jack and control system there

Details Multiple chamber coaxial hydraulic jack and control system there Multiple chamber coaxial hydraulic jack and control system there

1983-09-27

1985-07-30

Garrett, Robert E.

Expansible chamber devices

Annular working member or annular linearly extending chamber...

Axially extending hollow stem on working member

92110, 92112, 91519, 91520, F15B 1122

Patent

active

045314519

ABSTRACT:
An hydraulic jack having more than two chambers is disclosed and is intended for use in a system of jacks, the displacement of which is to be synchronized. Each jack has a cylindrical center cavity in which a piston with a cylindrical cross section reciprocates, an annular cavity in which a piston with an annular cross-section reciprocates, and a rod for transmitting thrust connected to both pistons. In order to provide the jack with a minimum longitudinal dimension and with maximum rigidity, the two cavities are concentric and are separated by a stationary intermediate wall. The two pistons are connected to the rod for the transmission of thrust.

REFERENCES:
patent: 524184 (1894-08-01), Palmer
patent: 2511883 (1950-06-01), Thierry
patent: 3335642 (1967-08-01), Rosaen
patent: 3792643 (1974-02-01), Scheafer
patent: 3877349 (1975-04-01), Schindel
patent: 4380427 (1983-04-01), Hehl
patent: 4409884 (1983-10-01), Buehringer
U.S. Patent & Trademark Office Classification Definitions, Cl 91, Motors, 2/1975, pp. 91-92, (1).

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