System for alignment of jib to crane
OwnerZach Minor, Kyle Gerberinventors
Life of this patent
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Abstract
A system for aligning a jib for attachment to a crane boom head, the boom head comprising a plurality of attachment points and a jib framework with a plurality of secondary attachment points. The jib framework includes a first and second side and a plurality of attachment points for securing the first and second sides of the jib framework to the boom head attachment points. The system also includes first and second shells with a plurality of axle mounted sheaves as well as a first rope a second rope. The system includes a drive assembly for independently adjusting the location of the secondary attachment points of the jib framework for alignment with the primary attachment points of the boom head.
Claims23
A system for attachment of a jib to a crane, the system comprising:
- a boom head, the boom head disposed at a distal end of the crane and comprising a plurality of primary attachment points;
- a jib framework, the jib framework comprising a first and second side and a plurality of secondary attachment points, the secondary attachment points operable for securing the first and second sides of the jib framework to the primary attachment points of the boom head;
- a first and second set of sheaves with each set of sheaves disposed respectively within a first and second shell with the first and second shells replicated on the first and second sides of the jib framework;
- at least one rope reeved through the first and second set of sheaves on each side of the jib framework to increase the mechanical advantage available to the system on both sides, each of the ropes comprising a first end and a second end, the first ends of each rope anchored to the jib framework;
- a drive assembly for rotating a drive shaft extending between the first and second sides of the jib framework, the drive shaft comprising a first and second end;
- and
- first and second opposed rotatable tensioning members, the rotatable tensioning members coaxial with the axis of rotation of the drive shaft, disposed outwardly from the drive assembly and each comprising a first and second end, the first end of each rotatable tensioning member rotatably mounted to the jib framework, the second end of each rotatable tensioning member comprising a drive member to facilitate engagement with the rotary motion of the drive shaft;
- and
- first and second slip collars independently operable to selectively transfer rotational motion from the drive shaft to the respective drive member for rotation of the rotatable tensioning member to which the second end of the rope is attached for purposes of adjusting the tension in the rope and repositioning the secondary attachment points of the jib framework.
A system for aligning a jib for attachment to a crane, the system comprising:
- a boom head of the crane, the boom head comprising a plurality of primary attachment points;
- a jib framework, the jib framework comprising a first and second side and a plurality of secondary attachment points for securing the first and second sides of the jib framework to the boom head primary attachment points;
- first and second shells with a plurality of axle mounted sheaves disposed therein, the shells and axle mounted sheaves disposed on both the first and second sides of the jib framework;
- a first rope with a first end and a second end, the first rope reeved through the first shell and axle mounted sheaves with the first end anchored to the jib framework and the second end anchored to a first rotatable tensioning member;
- a second rope with a first end and a second end, the second rope reeved through the second shell and axle mounted sheaves with the first end anchored to the jib framework and the second end anchored to a second rotatable tensioning member;
- and
- a drive assembly for independently adjusting tension applied to the first and second reeved ropes through rotation of the rotatable tensioning members thereby repositioning the secondary attachment points of the jib framework for alignment with the primary attachment points of the boom head.
Dependencies are inferred from the claim text.