Curane boom pivot structure

Details Curane boom pivot structure Curane boom pivot structure

1980-08-13

1982-07-06

Sheridan, Robert G.

Traversing hoists

Having means facilitating assembly or disassembly

Of traversing hoist from support

B66C 2326

Patent

active

043378676

ABSTRACT:
The pivot shaft for the boom of a large mobile construction crane is located near the upper side of the boom base section and its opposite ends are journaled in heavy bearings mounted on vertical side supports rising from a boom turntable. To lock the boom to the boom pivot shaft for unison rotation in the pivot shaft bearings, a single locking pin is received through registering openings in the pivot shaft and a surrounding hub or pillow block fixed to the boom structure within the confines of an internal box support. A screw-threaded extension on the locking pin engages a nut on the exterior of the boom base section, the nut being floatingly constrained by fixed guide tracks which prevent nut rotation with the threaded locking pin while allowing limited lateral and angular adjustment of the locking pin. A cross axis tethered removable retainer pin carried by the nut prevents backing out of the locking pin from its locking position and can only be inserted in the nut when the locking pin is fully in the locking position. The threaded locking pin overcomes a problem of inaccessibility of the interior end of the locking pin within the internal box support.

REFERENCES:
patent: 3139198 (1964-06-01), Penney et al.
patent: 3812979 (1974-05-01), Leihgeber

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