Means for storing and connecting jib for telescopic boom of mobi

Details Means for storing and connecting jib for telescopic boom of mobi Means for storing and connecting jib for telescopic boom of mobi

1974-12-20

1976-03-23

Spar, Robert J.

Traversing hoists

With haul-in line

212 59R, B66C 2362

Patent

active

039453332

ABSTRACT:
A mobile crane has a multisection telescopic boom and an optionally useable lattice jib storable alongside the boom with the base end of the jib adjacent the point end of the boom. One side of the boom base section is provided with a pair of longitudinally spaced apart jib storage support assemblies to facilitate storing and installing the jib. The point end of the boom fly section and the base end of the jib are provided with cooperating disconnectable hinge members for attaching the jib to the boom so that the jib can be swung horizontally between stored and installed positions. The point end of the boom fly section and the base end of the jib are provided with connection means, including a cylindrical rod on the boom fly section and cooperating journal bearings on the jib, for securing the jib to the boom in either axial aligned position or in downwardly tilted position, and adjustable strut means is detachably connected between the boom and the jib to limit the extent to which the jib can tilt downwardly. The jib is provided with a self-storing and self-erecting jib mast which is pivotally mounted on the upper side of the jib and cooperates with guy lines to support the jib during set-up and operation of the crane. Releasable locking means are provided on the boom fly section and the next adjacent boom section to prevent the extended boom sections from accidentally telescoping under the weight of the jib in the event of a hydraulic system failure.

REFERENCES:
patent: 3572517 (1971-03-01), Liebherr et al.
patent: 3698569 (1972-10-01), Lamer et al.
patent: 3831771 (1974-08-01), Wiencek

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