Harvesters – Motorized harvester – Having motor on ground-supported carrier
Patent
1992-05-13
1993-04-20
Bagnell, David J.
Harvesters
Motorized harvester
Having motor on ground-supported carrier
56249, 172427, 280 432, A01D 3454
Patent
active
052031519
DESCRIPTION:
BRIEF SUMMARY
This invention relates to grass cutting units provided with height of cut adjustment. More particularly, the invention concerns a grass cutting unit of a type having a cutting reel rotatably mounted in a frame with the frame being supported by a ground engaging roll to give the correct height of cut.
In a typical construction, a height of cut adjuster is provided at each end of the ground roll, the adjuster including a hand wheel which is rotated about a vertical screw axis to adjust the height of cut. During this adjustment, care is of course taken to maintain parallelism between the axis of the ground roll and the cutting line of the unit. There is, however, the problem that vertical loading on the threaded hand wheel tends to cause spurious rotation and it is usually necessary to provide a locking device to ensure that the height of cut does not vary and that parallelism is maintained during cutting.
The locking device often complicates the operation of adjusting the height of cut and, to the extent that additional components are required, will increase manufacturing costs. Space will of course need to be provided for any additional components and this may interfere with the overall design of the grass cutting machine of which the unit forms part. It will be recognised, for example, that where a number of cutting units are provided on one machine, it is desirable to have cutting units closely associated fore and aft to avoid uncut areas when the machine turns, without the necessity of large overlaps between cutting units.
It is an object of this invention to provide a grass cutting unit with height of cut adjustment in which the above difficulties are reduced or overcome.
Accordingly, the present invention consists in a grass cutting comprising a frame; a cutting reel rotatably mounted in the frame to define therewith a horizontal cutting line; a ground roll and roll support means connected between the roll and the frame and serving, with the roll in ground engagement, to support the frame with the cutting line at a desired cutting height above ground, wherein the roll support means comprises first and second screw-thread inter-engaging adjustment members operatively connected with the ground roll and the frame respectively, such that relative rotation of said adjustment members about a screw-thread axis thereof serves to adjust the cutting height, characterised in that there is provided a reaction member having a surface adapted for interlocking engagement with a surface of the first adjustment member to inhibit said relative rotation of the adjustment members and in that, to permit said adjustment of the cutting height, the first adjustment member is moveable away from the reaction member against the action of at least a substantial proportion of the weight of the frame and the cutting reel.
The invention will now be described by way of example with reference to the accompanying drawings in which:
FIG. 1 is an end view of a grass cutting unit according to this invention;
FIG. 2 is a rear view showing part of the unit of FIG. 1;
FIG. 3 is a top plan view showing part of the unit of FIG. 1;
FIG. 4 is a view similar to FIG. 1 illustrating a modification; and
FIGS. 5 and 6 are a part views illustrating respective further modifications.
Referring initially to FIGS. 1, 2 and 3, the described grass cutting unit has a frame shown generally at 10 providing a bed knife assembly 12 and bearings 14 for a cutting reel 16 shown in dotted outline. The cutting reel 16 and bed knife assembly 12 define a horizontal cutting line which is maintained at the desired vertical cutting height through the ground engagement of roll 18.
The ground roll 18 is rotatably supported at its ends in respective roll supports 20, only one of which is shown in the drawings. The necessary bearings can be located either in the roll supports 20 or within the roll 18 itself. In this way, the reaction R is transferred from the roll to the roll support 20. For convenience, the description that follows will be restricted to one roll support, it
REFERENCES:
patent: 1852100 (1932-04-01), Ballou
patent: 3099124 (1963-07-01), Strasel
Bagnell David J.
Ransomes Sims & Jefferies Limited
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