Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1988-05-23
1989-08-22
Spar, Robert J.
Material or article handling
Vertically swinging load support
Shovel or fork type
4146955, 74105, 74108, E02F 338
Patent
active
048591386
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION OF THE INVENTION
This invention relates to a boom for a vehicle and more particularly to a boom for carrying a working implement to enable operations to be carried out such as for examples only, excavation or loading.
According to a first aspect of the invention we provide a boom for a vehicle, the boom comprising first and second parts, the first part carrying a working implement and the second part being mounted on a body of the vehicle, the first and second parts being connected together for relative pivotal movement about a generally horizontal axis, a fluid operated actuating means acting between the first and second boom parts to effect the relative pivotal movement at least in one sense of rotation, characterised in that the fluid operated actuating means comprises two relatively movable members which operate in tension, one member being pivotally secured to one of the boom parts and the other member being connected via a flexible linkage to the other boom part.
Thus the two boom parts can be relatively pivoted to include a smaller angle between them than would be possible with a rigid linkage with the actuating means operating tension.
For example, the first boom part may comprise a dipper arm of an excavating vehicle which carries a bucket at its end outermost from the vehicle body. The included angle between the dipper and the second boom part can be reduced compared with rigid arrangements, to facilitate operation of the bucket over a larger working range.
The invention is particularly applicable where the boom is long i.e. more than seven metres long. Previously it has been necessary to use a cable and winch arrangement to cause the pivotal movement between the two boom parts, where it is required to permit the boom parts to pivot relative to one another to obtain an included angle of less than about 40.degree. and either a cable arrangement is required to move the boom parts outwardly from such an included angle, or to use a fluid operated actuated means operating in compression.
An arrangement which uses a cable arrangement to effect movement of one boom part relative to the other in both senses of rotation is shown and described in EP specification No. 0077684 of Priestman.
A ram between two such boom parts to effect movement of the boom parts in one sense of rotation only, but which does not operate in tension, but rather in compression, is shown and described in our previous Application No. GB 2168320. A winch and cable arrangement is used to effect relative movement in the other sense of rotation.
The flexible linkage arrangement of the boom may comprise one rigid element pivotally connected at or adjacent one end to the respective member of the fluid operated power means, and the rigid element may be pivotally connected at or adjacent its other end to the other boom part.
Alternatively, the flexible linkage may comprise two or more rigid elements which are pivotally interconnected to each other, one of the elements being pivotally connected at or adjacent one end to the respective member of the fluid operated actuating means and the other, or one of the other rigid elements may be pivotally connected at or adjacent one end to the other boom part.
Where two rigid elements are provided, preferably one is longer than the other.
In each case, the flexible linkage may be connected at or adjacent one end to a mounting point of the other boom part and at or adjacent the other end to one of the relatively movable members of the actuating means, and the other of the relatively movable members of the actuating means may be pivotally mounted to a mounting point of the second boom part. Preferably the actuating means is positioned exteriorly of the boom parts, the mounting points being spaced outwardly of the adjacent regions of the boom parts.
The rigid element or elements may be pivotable relative to the other boom part around the pivot axis between the two boom parts at least as the actuating means permits the two boom parts to relatively pivot to reduce the included angle between th
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patent: 2841998 (1958-07-01), Troche
patent: 3259259 (1966-07-01), Metailler
patent: 3380604 (1968-04-01), Leese
patent: 3904051 (1975-09-01), Tsuchiya
patent: 3952890 (1976-04-01), Armstrong
Brocklebank Norman
Cooper Alan
Baker Robert C.
Hienz William M.
J.C. Bamford Excavators Limited
Spar Robert J.
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