Supports – Stand – Plural leg
Patent
1974-10-15
1977-02-08
Hafer, Robert A.
Supports
Stand
Plural leg
2481883, F16M 1138
Patent
active
040068765
ABSTRACT:
An improved instrument support structure including a post telescoped in a column, with means for adjusting their combined length, and three legs pivoted at the bottom of a column for swinging movement from adjacent the column to extended, base defining positions. The legs are locked by extendible struts including fluid actuators with one strut interconnecting each leg with the column. Fluid from a reservoir on the column is directed to all actuators when the legs are extended, and then valving is closed to shut off fluid intercommunication and lock the legs. The valving further includes provision for permitting one of the leg actuators to be manually pumped for drawing fluid from the reservoir and forcing fluid into the other leg actuators for easy setup of the structure. The valving also includes manual control for selectively setting the different valve positions, and detent button means permits free rotation of the valve control in one direction while imparting a positive feel of the various settings and normally prevents rotation of the control in the other direction, but may be overridden by manually depressing the button. A further modification utilizes double-acting actuators and a return flow control valve to lock the legs from movement in either direction and thus allow the column to be "sandbagged".
REFERENCES:
patent: 2617257 (1952-11-01), Douglas
patent: 2831466 (1958-04-01), Stueland
patent: 3722847 (1973-03-01), O'Connor
patent: 3795378 (1974-03-01), Clarke
patent: 3850395 (1974-11-01), O'Connor
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