Jib adapter for an electrically insulated high voltage wire holder
The present invention is drawn to a solid core electrically insulating jib assembly comprised of a solid core electrically insulating material such as nylon which is retrofittable to replace the existing heavy duty non-insulating jib for direct lift of high-tension wires.
1. Field of the Invention
The present invention is generally drawn to high tension electrical wire supports and more particularly to electrically insulted jib assemblies.
2. Description of the Prior Art
Jib assemblies are well known and are typically described in U.S. Pat. Nos. 5,337,854; 4,466,506 and 4,838,381 and the reader is referred thereto for a fuller understanding of such as well as how they are mounted to booms of truck vehicles used for such work.
As best seen in
The jib assembly 10 is used to assist, in the handling of materials by a person carded in a bucket carrier 16, which is secured to the end of boom 12 by connection to rotatable shaft 18. The bucket carrier 16 moves rotationally with shaft 18 when shaft 18 rotates relative to the end of boom 12.
The bucket carrier 16 may be pivotally mounted to one end of shaft 18 by a conventional bucket rotation drive system (not shown), so that bucket carrier 16 is freely rotatable about an axis perpendicular to shaft 18.
The jib assembly 10 comprises a jib 20 slidably extending through a jib housing 22 made from two quadrant plates 24 and 26 extending respectively from each side of housing 22 and which are rotatably mounted on shaft 18 approximate one side of boom 12. The rotary movement of the jib with its housing is powered by jib motor through a chain speed reducer.
The longitudinal movement of jib 20 relative to jib housing 22 is effected manually according to the embodiment illustrated in the figures and can be locked at any position by any of a number of well known conventional means such as, for example, holes and pins in the jib housing. Alternatively, jib extension may be hydraulically powered. If powered, a hydraulic cylinder can be mounted on the winch housing in a conventional manner. Existing jibs are intended for lifting heavy loads up to the bucket operator or lifting loads such as electrical transformers.
Since the existing jib housings are made from either metal or hollow fiberglass, they do not provide sufficient electrical insulation for handling high-tension high voltage electrical wires whichn ar made from stranded aluminum wires. In fact there is a warning label on such hollow fiberglass jibs warning against their use on such exposed electrical wires. When such use is required, a heavy electrical insulator 24 is placed over the wire 26 prior to lifting it with a metal hook 28 located at the end of a wire 30 extending from a pulley 32 on the end of the jib as is best shown in
Since the only certifiable electrical insulator material for a jib is a solid core electrical insulator which will prevent high voltage electrical conduction across an air gap as is found in hollow fiberglass jibs, an electrically acceptable jib assembly was needed to replace existing jib assemblies when doing high-tension electrical wire work so the wires could be directly handled by the jib.
SUMMARY OF THE INVENTIONThe present invention solves the problems associated with prior art jib assemblies and others by providing a solid core electrically insulating jib which is assembly retrofitted to replace the existing heavy duty jibs used mainly for heavy lifting which will be suitable for direct lift of high-tension wires. The insulating jib may be easily replaced with the normal lifting jib when the wiring job is completed.
The insulating jib is comprised of a solid core electrically insulating material such as nylon. While it could be made in the same rectangular shape as the hollow core jib, a solid circular jib allows for material cost savings and uses rectangular electrically insulating material adaptors for mounting the insulating jib to the existing jib mnounting holders on the boom.
In view of the foregoing it will be seen that one aspect of the present invention is to provide an electrically approved jib replacement for existing lifting jibs.
Another aspect is to provide a jib assembly suitable for directly handling high-tension electrical wires.
Yet another aspect is to provide an adapter for mounting a circular solid insulator jib to an existing rectangular jib mount.
These and other aspects of the present invention will be more fully understood after a review of the following description of the preferred embodiment when considered with the accompanying figures.
BRIEF DESCRIPTION OF THE DRAWINGSIn the drawings wherein:
Referring now to the drawings generally and to
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For mounting the jib 34 to be hydraulically actuated to move with respect to the boom, a pair of adapters 48, 50 are needed. They are located at two areas of on the jib 34 as best seen in
The actual mounting to the boom is best seen in
As best seen in
It will be understood that certain obvious modifications and additions have been deleted herein for the sake of conciseness and readability but are fully intended to fall within the scope of the following claims
Claims
1. An electrically insulating jib assembly for lifting high-tension wires comprising:
- a rectangular lifting jib holder of non insulating material having a rectangular inner core;
- a rectangular adapter insert of insulating material having a central opening therein; and
- an electrically insulated jib conforming to said central opening to allow it to move inside said adapter.
2. An electrically insulating jib assembly as set forth in claim 1 wherein said central opening is circular and said insulated jib is also circular to slide within said central opening.
3. An electrically insulating jib assembly as set forth in claim 2 wherein said adaptor and said jib is made from nylon material.
4. An electrically insulating jib assembly as set forth in claim 3 including end caps on each end of said adaptor larger than the jib holder opening for retaining said adaptor inside said jib holder.
5. An electrically insulating jib assembly as set forth in claim 4 wherein said end caps have a central opening for allowing said jib to pass terethrough.
6. An electrically insulating jib assembly as set forth in claim 5 wherein said adaptor has a series of holes therein for allowing a pin to extend into the central opening thereof.
7. An electrically insulating jib assembly as set forth in claim 6 wherein said jib has a series of holes alignable with one of said holes in said adaptor for retaining said jib in said adaptor.
Type: Application
Filed: Dec 6, 2005
Publication Date: Jun 7, 2007
Inventor: William Krejci (Mentor, OH)
Application Number: 11/295,375
International Classification: E04G 1/00 (20060101);