Telescopic boom for portable cranes

Details Telescopic boom for portable cranes Telescopic boom for portable cranes

1977-08-24

1978-07-18

Sheridan, Robert G.

Static structures (e.g., buildings)

Mechanism operated relatively movable shaft assembly

Fluid pressure actuated

52118, 212 55, 212144, 254108, B66C 2304

Patent

active

041007077

ABSTRACT:
A telescopic boom, for portable cranes, having one or more hydraulically operated telescopic slides, and one or more mechanically operated telescopic slides. The extension or retraction of the mechanically operated telescopic slide is effected by means of a detachable retaining rod, one end of which is connected with the non-telescopic main boom by means of a bolt inserted transversely therethrough. The other free end of the retaining rod is provided with a pressure piece, for maintaining the boom in some of its positions during extension thereof, and a tensioning device, which is located 180.degree. opposite from the pressure piece, for maintaining the boom in some of its positions during retraction thereof. A plurality of slots are arranged along the mechanically operated telescopic slide transverse to the direction of operation. These slots respectively cooperate with a cam of the pressure piece or with a stop cam of a pawl during extension and retraction of the telescopic slide.

REFERENCES:
patent: 3795321 (1974-03-01), Johnston
patent: 4036372 (1977-07-01), Rao et al.

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