Self-locking device for telescopic props

Details Self-locking device for telescopic props Self-locking device for telescopic props

1974-12-10

1976-11-16

Foss, J. Franklin

Supports

Props and braces

Adjustable length

403374, E04G 2500, E04G 2508, B66F 308

Patent

active

039919641

ABSTRACT:
A telescopic prop of the kind used for supporting formwork and scaffolding in building construction has a self-locking device which enables the prop to be locked at any desired extension without the use of the customary locking pins. The self-locking is effected through the action of a number of balls housed in an annular channel of downwardly tapering width, the balls jamming against the surface of the inner extension member of the prop, which may be a length of standard scaffolding tube.

REFERENCES:
patent: 581136 (1897-04-01), Preece
patent: 909223 (1909-01-01), Reynolds
patent: 1031637 (1912-07-01), Fischer
patent: 1270977 (1918-07-01), Schade
patent: 1390189 (1921-09-01), Bixler et al.
patent: 2838266 (1958-06-01), Rees
patent: 2851126 (1958-09-01), Ward
patent: 2872223 (1959-02-01), Shearman et al.
patent: 2991966 (1961-07-01), Varel
patent: 3604734 (1971-09-01), Friedman
patent: 3871780 (1975-03-01), Svensson

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