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US 5,343,641 AGranted
Spreader bar for strip mine rigging apparatus
OwnerGeorge Gregoryinventor
Life of this patent
Estimating the term…
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.
Claims8
A spreader bar assembly for an excavating bucket, comprising:
- (a) a structural member which serves to separate the lifting chains of an excavating bucket, said structural member having opposite ends;
- (b) a pair of pivotal end pieces adapted to pivotally attach to the opposite ends of said structural member;
- and
- (c) connection means on the pivotal end pieces for connecting to the lifting chains of a hoist and to an excavating bucket for lifting the excavating bucket and controlling its position wherein the opposite ends of the structural member and the pivotal end pieces have a cooperating stop member which limits the pivotal motion of the pivotal end pieces with respect to the ends of the structural member.
1 more element
Dependencies are inferred from the claim text.