Traversing hoists – With means to project load engager beyond end of boom
Reexamination Certificate
1998-03-20
2001-02-13
Brahan, Thomas J. (Department: 3652)
Traversing hoists
With means to project load engager beyond end of boom
C212S347000, C212S300000
Reexamination Certificate
active
06186346
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the nose of a boom; and more particularly, a multi-position low profile boom nose.
2. Description of Related Art
The nose of a boom, multi-section or otherwise, is typically a welded steel structure that houses and provides support for one or more sheaves mounted to a shaft, and is used to redirect a lifting or load line around the point end of the boom to the load. Boom nose sheaves may be mounted to one single shaft at one location, but often there is an upper sheave assembly and a lower sheave assembly. The upper or primary sheave directs the load or lifting line around the end of the boom to a lower or secondary sheave assembly (i.e., lower boom nose sheave, auxiliary boom nose sheave, boom extension sheave). The secondary sheave assembly is necessary to accommodate multiple parts of line required when loads, which are greater than the allowable limit for one or two parts of line, are lifted. If no loads will be lifted that exceed the allowable limit for two parts of line, then one sheave location is sufficient.
When multiple parts of line are required, a hookblock is used to lift the load. A hookblock is a lifting device consisting of one or more sheaves enclosed in a steel housing with a hook at the bottom used for grabbing the load. For two parts of line, the wire rope must pass over the lower sheave on the boom nose, continue down around the hookblock sheave, and then return back again to the boom nose where it is attached to a dead end lug. For three or more parts of line, an appropriate number of lower boom nose sheaves and hookblock sheaves are required, and the load line is reeved back and forth between the two until the number of parts of line is obtained.
When lifting loads using multiple parts of line at high boom angles, the return lines from the hookblock to the lower boom nose sheaves must clear the bottom of the boom sections. This requires that the boom nose extend below the bottom of the boom to accommodate the necessary location of the lower boom nose sheaves. Thus, the overall height of the boom nose becomes greater than desirable as it reduces the height a load may be lifted.
A compact boom nose is an important feature when lifting loads in confined areas where accessibility is limited. However, it is also desirable that the maximum lifting capability not be compromised.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a multi-position boom nose which overcomes the problems and disadvantages discussed above.
A further object of the present invention is to provide a compact boom nose.
A still further object of the present invention is to provide a multi-position low profile boom nose having a primary and secondary sheave set with the secondary sheave set being stowable.
Another object of the present invention is to provide a boom nose which is compact and maximizes lifting capabilities.
Also an object of the present invention is to provide a multi-position boom nose having primary and secondary sheave sets with the secondary sheave set being positionable such that both the primary and second sheave sets can each support a load bearing member.
These and other objectives are provided by a multiposition boom nose, comprising: a support structure disposed at one end of a boom and supporting at least a first sheave set, said first sheave set including at least one sheave; a pivot arm having a first and second end, said first end pivotally connected to said support structure, said second end supporting a second sheave set, said second sheave set including at least one sheave, said pivot arm having at least a first working position and a stowed position, said pivot arm extending towards said boom in said stowed position.
These and other objectives are further provided by a multi-position boom nose, comprising: a support structure disposed at one end of a boom and supporting at least a first sheave set, said first sheave set including at least one sheave; a first load bearing means for bearing a load; a second load bearing means for bearing a load; a pivot arm having a first and second end, said first end pivotally connected to said support structure, said second end supporting a second sheave set, said second sheave set including at least one sheave, said pivot arm having at least a first working position and a second working position, said first load bearing means being supported by said first sheave set and said second load bearing means being supported by said second sheave set when said pivot arm is in said second working position.
Other objects, features, and characteristics of the present invention; methods, operation, and functions of the related elements of the structure; combination of parts; and economies of manufacture will become apparent from the following detailed description of the preferred embodiments and accompanying drawings, all of which form a part of this specification, wherein like reference numerals designate corresponding parts in the various figures.
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Lift Equipment, “Shuttlelift debuts new carrydeck crane”, Apr.-May 1998, p. 51.
Birch & Stewart Kolasch & Birch, LLP
Brahan Thomas J.
Grove U.S. L.L.C.
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