Return assembly for a swivable sheave
AssigneeDresser Industries, Inc.
InventorJeremy F. Elliot
Life of this patent
Estimating the term…
Abstract
In a machine having a boom, a sheave swivably mounted on the boom and a line reeved over and around the sheave, an assembly for returning the sheave to a predetermined position relative to the boom upon the sheave being rotatably displaced about its swivel axis by forces applied by the line, consisting of a righting arm operatively connected to the sheave for rotatable movement therewith about the swivel axis and means operatively engageable with the righting arm for rotatably biasing the righting arm and correspondingly the sheave about the swivel axis toward the predetermined position.
Claims11
In a machine having a boom, a sheave rotatably mounted on said boom, means for swivably mounting said sheave on said boom for pivotal motion about a swivel axis and a line reeved over and around said sheave, an assembly for returning said sheave to a predetermined position relative to said boom upon said sheave being pivotally displaced about its swivel axis by forces applied by said line, comprising:
- a righting arm,
- connecting rod means operatively connecting said sheave to said righting arm for transmitting said pivotal motion of said sheave about said swivel axis to said righting arm and
- means operatively engageable with said righting arm for pivotally biasing said righting arm and correspondingly said sheave about said swivel axis toward said predetermined position.
Dependencies are inferred from the claim text.