Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1981-09-08
1983-06-21
Spar, Robert J.
Material or article handling
Vertically swinging load support
Shovel or fork type
74471XY, 180333, G05G 1300
Patent
active
043891519
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to twin control lever arrangements for the control of three functions in such a manner that either control lever can be used to control a particular one of the three functions. In particular, though not exclusively, the invention is directed to a twin control lever arrangement for controlling three hydraulic valves.
Several twin control lever arrangements of the above type have previously been proposed but none of these has been of a simple, economic and reliable construction.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a twin lever control arrangement which overcomes the above shortcomings.
Thus according to the present invention there is provided a twin control lever arrangement for the control of three functions comprising a first control lever mounted on a first mounting means for pivoting about first and second perpendicular axes to operate first and second functions respectively, a second control lever mounted on a second mounting means for pivoting about a third axis aligned with said first axis and a fourth axis parallel to said second axis, pivoting of said second lever about said third axis operating said third function, and a link member extending generally perpendicularly to the two control levers to operatively connect said levers by way of pivotal connections at both ends of the link member, whereby the two levers pivot together about said second and fourth axis to allow either lever to operate said second function but said first lever can pivot about said first axis to operate said first function without causing sufficient movement of said second lever about said third axis to operate said third function and said second lever can pivot about said third axis to operate said third function without causing sufficient movement of said first lever about said first axis to operate said first function.
Such a twin control lever arrangement is particularly suitable for the control of three hydraulic valves which operate a four-in-one bucket fitted to a front end loader on an industrial tractor. In such an application pivoting of the first control lever about the first axis could be arranged to control a first valve which controls the raising and lowering of loader support beams, pivoting of the first or second lever about the second or fourth axis could be arranged to control a second valve which controls the rolling-back and emptying of the bucket, and pivoting of the second lever about the third axis could be arranged to control a third valve which controls the opening and closing of the four-in-one bucket. Thus either lever could be used to control the rolling-back and emptying of the bucket.
A particularly convenient arrangement is provided if the two levers are close enough together to be spanned by one hand.
Such control lever may comprise a lower portion mounted on a main universal joint and an upper handle portion supported by the lower portion, and in which the link member extends between the handle portions of the control levers. Alternatively the link member may extend between the lower portions of the control levers.
The link member may be adjustable in length to facilitate installation and fine adjustment of the twin lever arrangement.
The first control lever may be mounted on a stand and the second control lever mounted on an arm supported from said stand.
The levers can be connected with the three functions by any appropriate means, for example rods or cables.
Two examples of twin control lever arrangements embodying the present invention, for the control of three spool valves on a loader of an industrial tractor, will now be described, by way of example only, with reference to the accompanying drawings in which:
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a general view of a twin control lever arrangement embodying the present invention;
FIG. 2 is an exploded isometric view of the twin control lever arrangement of FIG. 1;
FIG. 3 is a diagrammatic representation of the twin lever control arrangement;
FIG. 4 di
REFERENCES:
patent: 2818746 (1958-01-01), Hart
patent: 3319817 (1967-05-01), Juhl et al.
patent: 3893346 (1975-07-01), Paul
patent: 4054083 (1977-10-01), Utter
patent: 4098286 (1978-07-01), Prime
patent: 4140144 (1979-02-01), Dowd et al.
Massey-Ferguson Services N.V.
Siemens Terrance L.
Spar Robert J.
Thompson John C.
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