Spreader bar for strip mine rigging apparatus

Details Spreader bar for strip mine rigging apparatus Spreader bar for strip mine rigging apparatus

1992-10-16

1994-09-06

Taylor, Dennis L.

Excavating

Cable-operated

Boom-type

37399, 37396, E02F 346

Patent

active

053436415

ABSTRACT:
A spreader bar assembly has a middle spreader bar having a nose-shaped link at opposite ends to which is pivoted pivotal end pieces which comprise about half of the structural weight. The pivotal end pieces have a rounded tip portion which is pivotally connected to the nose-shaped link by pin members which are secured by keepers. The pivotal end pieces have upper and lower transverse openings for pins in order to connect the chains of a hoist which also connect an excavator bucket. Greatly increased life before failure results from the three-piece construction.

REFERENCES:
patent: 3541710 (1970-11-01), Sankey et al.
patent: 3597865 (1971-08-01), Rumfelt
patent: 4329794 (1982-05-01), Rogers
patent: 4689904 (1987-09-01), Briscoe
patent: 4791738 (1988-12-01), Briscoe
patent: 4944102 (1990-07-01), Behlendorf et al.

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