Harvesters – Tedders
Patent
1994-10-20
1996-04-02
Suchfield, George A.
Harvesters
Tedders
56380, A01D 7810
Patent
active
055029590
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns a tedder of the type having a main frame for connection with a tractor and a carrier beam pivotally supported from the main frame for pivoting about a horizontal axis. A plurality of rake rotors are rotatably supported from the carrier beam with each rotor also being supported by a travelling wheel having a height adjustment with respect to the carrier beam which has an angle adjustment mechanism. In such a tedder the angle adjustment mechanism for pivoting the carrier beam makes it possible to change the inclination of the rake rotors with respect to the travelling direction to obtain optimum spreading of the mown grass crop. Height adjustment means for the travelling wheels make it possible to change the inclination of the rake rotors such that the desired height of the rake springs above the ground is maintained constantly in the direction of forward travel.
2. Description of the Prior Art
In the known tedders of the present type the angle adjustment and the height adjustment are effected independently of each other, e.g. by means of hydraulic cylinders as shown and described in DE-B2-26 13 027, or by means of screw spindles and cord drives as shown and described e.g. in DE-C2-25 45 712.
SUMMARY OF THE INVENTION
The object of the invention is to provide a tedder of the present type which is so adapted that adjustment of the angle of the rake rotors is automatically accompanied by a corresponding height adjustment of the travelling wheels.
This object is achieved by an angle lever pivotally mounted on the carrier beam such that the axis of rotation of the angular lever is displaced when the carrier beam is pivoted to change the angle, and is rotated because of the connection of one arm with a point fixed with respect to the main frame such that the height adjustment means is displaced to change the wheel height. This adjustment can be performed from the cab of the tractor in the operation of the tedder.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be explained more fully below with reference to the drawing, in which
FIG. 1 is a vertical, partially sectional view of an embodiment of the tedder of the invention with a divided drive shaft,
FIG. 2 is a corresponding vertical view of a second embodiment having a through-going drive shaft, and
FIG. 3 is a vertical section through an amended embodiment of a part of the tedder.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In FIG. 1, 10 is a part of a main frame which is adapted to be suspended from the three-point suspension of a tractor in a generally known, not shown manner. A hollow carrier beam 11, which has a substantially rectangular cross-section and extends perpendicularly to the travelling direction in the entire length of the tedder, is pivotally suspended from the main frame 10 by means of arms 12, which are rotatable about a shaft 13 extending between nose members 14 on the main frame. An upwardly extending, angular bracket 15 is secured on the upper side of the carrier beam 11, and a nut 16 is rotatably arranged at the outer end of the bracket. A screw spindle 17, which can be rotated from the cab of the tractor in a manner not shown, extends smoothly through a sleeve 18 which is rotatably mounted in an upstanding bracket 19 secured to the main frame 10. A lock disc 20 is secured on both sides of the sleeve 18 on the screw spindle 17, preventing axial displacement of the screw spindle which extends threadedly through the nut 16. The advantage of the mechanism described above is that the carrier beam 11 can pivot about the shaft 13 by rotation of the screw spindle 17.
A plurality of rake rotors, only one of which is shown in the drawing, are rotatably suspended from the carrier beam. The rake rotor, which is generally designated by 21, has a hub disc 22 mounting, e.g. by means of screws or rivets 23, a plurality of arms 24 which carry rake means 25. The hub disc 22 is secured on a hollow shaft 26 which is rotatably mounted by means of ball bearings 27 and 28 on
REFERENCES:
patent: 3546867 (1970-12-01), Hauser-Lienhard
patent: 3640056 (1972-02-01), Maier et al.
patent: 3948028 (1976-04-01), Reber
patent: 4149364 (1979-04-01), Aron
patent: 4926619 (1990-05-01), Ungruh et al.
patent: 5111636 (1992-05-01), Quirin
Kverneland Taarup AS
Suchfield George A.
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