B - Operations – Transporting – 66 – C
Patent
B - Operations, Transporting
66
C
212/28.4
B66C 23/04 (2006.01) B66C 23/70 (2006.01)
Patent
CA 1058571
ABSTRACT OF THE DISCLOSURE Adjustable side shoe assemblies are provided on respective side walls of adjacent movable boom sections of a crane boom assembly to maintain alignment between the sections. A boss provided on each side wall at the upper end of a movable boom section of a crane boom assembly has a tapped hole passing through the section. A threadable member, preferably composed of a phenolic or other abradable material can be inserted into the threaded opening provided in the side wall of the boom section, the member being threadably rotated into the opening to engage the side wall of the next adjacent boom section. Respective aligned openings provided in the side walls of the boss and the threadable member receive a retaining member, such as a cotter pin, to hold the threadable member in place on the boom section. The openings in the threadable member may be placed at spaced intervals to permit inward adjustment of the threadable member to compensate for the wear of such member under repeated extension and retraction of the- boom assembly. A similar arrangement is provided at the opposite end of the next inner boom section, with the boss projecting inwardly and the threadable member being threaded outwardly to engage the next outer boom section to hold pairs of adjacent sections in aligned relationship at the lower ends of the sections.
290855
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