Traversing hoists – Having boom shiftable vertically along a linear path – Fluid actuated
Patent
1984-11-20
1986-12-23
Blix, Trygve M.
Traversing hoists
Having boom shiftable vertically along a linear path
Fluid actuated
212264, 212267, 56 119, B66C 2356
Patent
active
046307419
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
THIS INVENTION relates to an extendible boom, and more particularly to a boom which may be powered for extension and retraction in application on tractors and other like work vehicles to enable operations such as spraying, mowing etc.
BACKGROUND ART
A wide variety of equipment has been developed by which sprays, mowers, etc., may be operated off transport vehicles, such as tractors and other like vehicles, in order to cover extensive areas. Sprays, etc., are commonly mounted off booms in order that tractors travelling along access routes may apply sprays to areas off the access route. Similarly mowers, slashers, etc., working off roadways, utilise booms in order to reach roadside verges and cut down unwanted vegetation. These operations require deployment of boom type structures and fixed booms are of little use. Booms are known which may be swung out of the way. Hydraulically extendible booms similar to those used in crane construction have been used. However, no ready and simple solution has yet been found in the quest for an economical and easily maintained boom, for application off tractors and other like vehicles, to enable operations such as spraying, mowing etc.
OUTLINE OF THE INVENTION
It is an object of the present invention to provide an extendible boom which lends itself to motorised operation for the carrying of work heads during operation off mobile carriers therefor. It is a further object of the present invention to provide an extendible boom which comprises a simple construction, and an efficient and reliable mode of operation. It is a still further object of the present invention to provide an extendible boom which may be presented as a light weight construction. Another object of the present invention is an extendible boom which may be retractively extended using a simply realised rack and pinion style assembly. An additional object of the present invention is a boom which is cheap to manufacture requiring low labour input to its construction. Other objects and advantages will hereinafter become apparent.
The present invention achieves its objects by provision of an extendible boom for the operation of work heads supported thereon off supporting vehicles therefor comprising a boom assembly having an elongated work head carrying arm mounted on a supporting means therefor which enables reciprocating movement of said elongated arm in a direction extending along the length thereof, and a source of motive power for application to said elongated work head carrying arm to move said arm back and forth characterised in that a rack and pinion mechanism is employed for coupling said source of motive power to said arm wherein said rack extends along the length of said arm and said pinion is connected to said source of motive power, said arm comprises a hollow channel section having a lengthwise extending slot through a wall thereof through which a plate-like supporting member of said supporting means is passed having bearing mounting means within said channel, bearing assemblies mounted to said mounting means and engaging with inner surfaces of said hollow channel section to locate and guide said channel for lengthwise movement on said bearing assemblies.
BRIEF DESCRIPTION OF DRAWINGS
In order that the invention may be more readily understood and put into practical effect, reference will now be made to the accompanying drawings which illustrate a preferred embodiment thereof and wherein:
FIG. 1 shows schematically the features of an extendible boom according to the present invention;
FIG. 2 is a section through the boom of FIG. 1;
FIG. 3 shows an extendible boom according to the present invention mounted to a tractor;
FIG. 4 illustrates a mechanism for properly tensioning the chain employed in a boom according to the present invention;
FIG. 5 illustrates a front view of a mechanism for mounting a boom according to the present invention off a tractor;
FIG. 6 is a side view of the mechanism of FIG. 5; and
FIG. 7 is a sectional view through the boom of the mech
REFERENCES:
patent: 1611326 (1926-12-01), Abbe
patent: 2823947 (1958-02-01), Delzer
patent: 2872050 (1959-02-01), Norwood
patent: 2896750 (1959-07-01), Eitel
patent: 2993605 (1961-07-01), Smith
patent: 3462925 (1969-08-01), Lanier
patent: 4266908 (1981-05-01), Leiker
Avila Stephen P.
Blix Trygve M.
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