Earth working – Mast type hitch
Patent
1996-07-03
1997-08-19
Melius, Terry Lee
Earth working
Mast type hitch
172272, 414703, 2804162, B66F 1100, A01B 5900
Patent
active
056578253
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a coupling device at a tractor, provided with a three-points fastening for tools, with an upper top beam, with a first substantially horizontally displaceable fastening link, and two lower traction beams, with second and third substantially vertically displaceable fastening links, and a power output in the form of a substantially horizontally rotating shaft, directed in the longitudinal direction of the tractor, comprising, a first coupling frame, fastened hinged at said first and third fastening links, and a second coupling frame, provided with at least an upper (25) and two lower fastening links for hinged fastening of a tool, the first coupling frame being provided with a first coupling element in longitudinally and directionally variable rotation connection with said rotating shaft of the tractor, the second coupling frame being provided with a second coupling element being able to be connected to rotation connection with the first coupling element, to transfer the effect of said rotating shaft to the tool, the coupling frames being provided with cooperating upper and lower fastening elements.
BACKGROUND OF THE INVENTION
Several coupling devices for tractors are known. A compilation of such, utilized or just suggested is given in the Swedish Patent Application SE- 8104211-1, published as laid open publication No. 434 000 on 1984 Jul. 2nd. In this publication coupling devices of all conceivable types are described, also of the art mentioned introductorily. There is also a list of the demands for such coupling devices. Among those demands may be mentioned:
Among the described couplings some are very complicated and expensive, and furthermore they do not meet said two demands.
SUMMARY AND OBJECTS OF THE INVENTION
Thus the object of the invention is to provide a coupling device of the type mentioned introductorily, which is simple and relatively inexpensive in construction and manufacture, and which admits simple and safe coupling of tools to the tractor, and that can be easily adjusted according to needs.
According the invention such a coupling device is characterized primarily in that the upper fastening element of the first coupling frame consists of two fastening hooks, turned from the tractor, provided at a distance from each other symmetrically from the vertical symmetric axis of the coupling frame, converging upwards towards each other, and that the second coupling frame comprises an upper beam element, in each end limited by downwardly directed limiting elements, the fastening hooks and the beam element being formed and provided in such a way, that the fastening hooks can be brought, from below, to vertically and horizontally correct coupling with the horizontal coupling frame, also when the first and second coupling frames are somewhat mutually twisted in a plane perpendicular to the longitudinal direction of the tractor.
Advantageously the fastening hooks are formed with their limiting surfaces turned to the tractor, seen from above tilting towards the tractor.
In one suitable embodiment of the invention, the first coupling frame is formed substantially rectangular, which is advantageously also the case with the second coupling frame. Said beam element is, in one preferred embodiment, formed with a circular cylindrical outer limiting surface. The limiting element of the beam element suitable forms walls in the second coupling frame.
The fastening hooks may be formed in different ways, under the provision, that they admit said desired function in one advantageous embodiment the outer limiting surfaces of the fastening hooks, seen laterally, are convex, preferably generated by radii in a vertical plane substantially equal to the distance between said limiting elements. Of course a certain play is needed, in order that the fastening hooks and the beam element resp their limiting surfaces shall not get in binding connection.
In one further suitable embodiment of the coupling device according to the invention, the lower cooperating fasteni
REFERENCES:
patent: 3151883 (1964-10-01), Stuart
patent: 3231294 (1966-01-01), Horney
patent: 3306630 (1967-02-01), Weiste
patent: 3427046 (1969-02-01), Sommer et al.
patent: 3871463 (1975-03-01), Geisthoff
patent: 4477101 (1984-10-01), Nilsson et al.
patent: 4850789 (1989-07-01), Zimmerman
patent: 5026247 (1991-06-01), Zimmerman
patent: 5193623 (1993-03-01), Burette
Northern Lawn and Garden Catalog, p. 6--no date.
Melius Terry Lee
Pezzuto Robert
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