Telescopic boom with hydraulic actuating mechanism

Details Telescopic boom with hydraulic actuating mechanism Telescopic boom with hydraulic actuating mechanism

1976-05-03

1977-11-15

Braun, Leslie

Static structures (e.g., buildings)

Mechanism operated relatively movable shaft assembly

Fluid pressure actuated

52118, 212144, 214141, 254108, B66C 2304

Patent

active

040579425

ABSTRACT:
A telescopic boom for movable cranes with at least one hydraulically operable telescopic slide and with at least one mechanically operable telescopic slide. The pushing out movement and the retracting movement of the mechanically actuated telescopic slide is effected by means of a holding bar having a free end portion provided with a pressing or pushing member and with a pulling member offset by 180.degree. with regard to the pressing or pushing member. The other end of the holding bar is provided with a transverse bolt for engagement with a bearing on the at least one hydraulically operable slide. The mechanically operable telescopic slide is provided with cams extending transverse to its longitudinal direction of movement for cooperation with the holding bar.

REFERENCES:
patent: 2746612 (1956-05-01), Wirz
patent: 3368696 (1968-02-01), Johnston et al.
patent: 3386594 (1968-06-01), Grove
patent: 3398645 (1968-08-01), Nansel
patent: 3471034 (1969-10-01), Shinohaya
patent: 3481581 (1969-12-01), Sunseri
patent: 3620379 (1971-11-01), Fauchere
patent: 3670465 (1972-06-01), Cheze
patent: 3721054 (1973-03-01), Hornagold
patent: 3963127 (1976-06-01), Eriksson

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