Earth working – With drive means for tool or cleaner – Tool drive details
Patent
1987-01-30
1989-06-13
Johnson, Richard J.
Earth working
With drive means for tool or cleaner
Tool drive details
56 119, 172677, 172 47, 172324, 180 534, A01B 5904
Patent
active
048383589
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a coupling device for connecting a wheeled agricultural implement with hydraulically driven working means to a tractor provided with mechanical power take-off.
BACKGROUND OF THE INVENTION
For the connection of such wheeled agricultural implements, inter alia cutters, exact cutters and the like, to a tractor, coupling devices are required which, on one hand, ensure a stable towing connection and, on the other hand, provide a transfer of motive power from the power take-off of the tractor to the driven working means of the implement in such a manner that the losses of transfer become as small as possible and the maneuvering ability in the field as optimal as possible so that the implement may follow the ground and the crop, thereby running through the field as efficiently and quickly as possible.
In most of the prior coupling systems either the centrally mounted towing hitch of the tractor or a towing bar between the lifting linkage is used for directly coupling the drawbar of the implement through which the towing force is transferred to the implement. The driving power is simultaneously transferred from the power take-off of the tractor by means of a primary, releasable power transfer shaft to a secondary power transfer shaft journalled in connection with the drawbar and connected with the working means of the implement through a universal joint. The primary, releasable power transfer shaft provided with two universal joints and an intermediate telescopic part is a critical point of the coupling-up. To obtain the optimum degree of efficiency and correct geometry of rotation of the shaft the coupling point between the towing device of the tractor and the drawbar must be located approximately halfway between the power take-off of the tractor and the secondary power intake of the power transfer shaft which generally includes a connecting shaft. Since a large angle of swing is at the same time desired when turning in the field, the primary power transfer shaft has to be comparatively long which gives rise to vibrations and thus to increasing wear and tear and even damage. If the coupling point is moved from the center of the power transfer shaft, the power transfer shaft may, for the same angle of swing, be shorter. In return, however, the maximum angular motion within the universal joints increases, whereby also wear and tear and the risk of damage increases. This problem may partly be eliminated by use of a so-called wide-angle universal joint, but this solution is still insufficient if it is desired to manoeuvre at large angles of swing.
With a view to improve the maneuvering ability and to simultaneously reduce wear and tear in the power transfer a coupling device is known from Danish patent application No. 4283/80, according to which the towing force as well as the motive power is transferred from the tractor to the implement through a supporting unit for a mechanical transmission consisting of at least two parts mutually pivotal about a vertically extending axis. The one part of said supporting unit operates as a releasable pull connection with the tractor lifting linkage and as a journal for the input shaft of the transmission, respectively, said shaft being releasably connected to the power take-off of the tractor by means of a propeller shaft. The other part of the supporting unit operates as a permanent pull connection with the drawbar of the implement and as a direct or indirect journal bearing for the output shaft of the transmission, respectively, firmly connected with a mechanical transmission journalled within or along the drawbar and being in the form of a driving shaft or a belt drive transferring the motive power to the working means of the implement.
The prior coupling device allows for working at large angles of swing between the tractor and the drawbar of the implement without the risk of overloading the primary power transfer shaft. On the other hand, the solution is more complicated and somewhat more expensive than the conventional sol
REFERENCES:
patent: 1496999 (1924-06-01), Ray
patent: 1661737 (1928-03-01), Raimer
patent: 2171761 (1939-09-01), Paradise
patent: 2569507 (1951-10-01), von Schlegell
patent: 3665685 (1972-05-01), Allard
patent: 3715872 (1973-02-01), Thompson
patent: 4366877 (1983-01-01), Vissers
patent: 4584826 (1986-04-01), Bettencourt
JF-Fabriken - J. Freudendahl A/S
Johnson Richard J.
LandOfFree
Coupling device for connecting a wheeled field implement to a tr does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Coupling device for connecting a wheeled field implement to a tr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coupling device for connecting a wheeled field implement to a tr will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1269934