Hydraulic control valve arrangement for operating tables and the

Details Hydraulic control valve arrangement for operating tables and the Hydraulic control valve arrangement for operating tables and the

1975-03-25

1976-08-31

Smith, Al Lawrence

Work holders

Miscellaneous

A61G 1300

Patent

active

039776646

ABSTRACT:
A hydraulic control valve arrangement for operating tables or the like, in which the table has both table top function control valves and associated hydraulic movement actuation cylinders and an elevate function valve and associated hydraulic elevation cylinder, and in which the elevate function control valve is operated by a separate control lever and is in overriding control of fluid supply pressure to the separate control lever-actuated table top function control valves, whereby either the elevate cylinder or a table top function actuation cylinder may be individually operated at one time, but not both the elevate cylinder and a table top function control cylinder, and whereby it is not necessary to switch a single control lever back and forth between elevate position and a selected table top function control position in order to selectively alternately effect elevation adjustment and a given selected table top function adjustment of the table top for desired table top positioning. A pilot-operated cylinder lock valve and pressure-compensated valve arrangement is provided in flow control to and from each hydraulic cylinder or cylinders actuating arrangement to prevent external load-induced movement of the cylinders and associate table top section or sections and to smooth out flow and table top movement when abrupt supply and/or external load-induced hydraulic pressure variations occur.

REFERENCES:
patent: 3206188 (1965-09-01), Douglass et al.
patent: 3845946 (1974-11-01), Warden et al.
patent: 3868103 (1975-02-01), Pageot et al.
patent: 3896704 (1975-07-01), Barud et al.

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