JPH0454751Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a rotary mower that is attached to the underbelly, front, or rear of a tractor to cut weeds, grass, etc.

[Prior art and its problems] Conventionally, this type of rotary mower has a cutting blade fixed to the lower part of a vertical shaft that is pivotally supported in a mower deck, and a tunnel-shaped grass discharge passage that projects upward on the front side of the mower deck. The grass and grass cut by the cutting blade inside the mower deck are discharged outside the mower deck.

However, such conventional devices cannot freely change and adjust the volume of the grass discharge passage, so the processing capacity for discharging grass cannot keep up when the grass is tall or the grass is dense. There was a problem that the grass could not be discharged smoothly.

In such cases, the speed of the tractor must be reduced to carry out the work, which has the disadvantage of poor efficiency.

[Means for solving the problem] This invention was proposed in view of the above-mentioned problems, and the following technical measures were taken.

That is, a plurality of vertical shafts 6 are mounted on a box-shaped mower deck 4 whose lower surface is open at appropriate distances in the left and right directions, and cutting blades 1 are fixed to the lower portions of these vertical shafts 6. The mower deck 4 is configured so that the upper surface and the side wall surface cover the rotating part, and a grass discharge passage 5 is formed in the front part of the mower deck 4 for discharging the grass cut inside the mower deck 4 to the outside of the mower deck 4. In the rotary mower, the grass discharge passage 5 is constituted by the front wall part 3 and the rear wall part 22 of the mower deck 4, and a cover 23 having an inverted U-shaped cross section, and the cover 23 is configured to be movable and adjustable in the vertical direction. This rotary mower is characterized in that the cross-sectional area on the discharge side of the grass discharge passage 5 can be changed and adjusted.

[Example] Hereinafter, an example of this invention will be described based on the drawings. This embodiment will be explained by taking as an example a mid-mount type rotary mower that is attached to the lower abdomen of a tractor (not shown).

Three vertical shafts 6 are attached to the moadetsuki 4 whose lower surface is open.
is pivotally supported at appropriate intervals in the left and right horizontal directions, and the cutting blade 1 is fixed to the lower part of this vertical shaft 6.

More specifically, blade parts 7 are provided at both ends of the straight-edged blade body, a boss part 8 having a shaft hole is provided at the center in the longitudinal direction, and the lower end of the vertical shaft 6 is fitted and fixed to this boss part 8. . Reference numeral 16 denotes a blower blade provided at the end of the cutting blade 1.

Reference numeral 10 denotes a gear case, and an input shaft 9 is rotatably supported in the gear case 10 so as to face forward.

A pulley 11 is attached to the lower vertical shaft 6 of the gear case 10.
is attached, and an endless belt 15 is wound between this pulley 11, other pulleys 12 and 13 fixed to the vertical shaft 6, and a tension pulley 14. The vertical shaft 6 is configured to rotate clockwise in FIG. 1 when the input shaft 9 is rotationally driven by obtaining rotational power from the PTO shaft on the tractor side.

The mower deck 4 is supported by the roller through a suitable link mechanism so as to be able to rise and fall freely, and its lower edge is folded inward to form a protrusion 18, and the upper front side of the mower deck 4 has an upper surface 2.
A tunnel-shaped grass discharge passage 5 which is one step higher is formed. The grass discharge passage 5 is constructed so that the height of the protrusion becomes higher toward the discharge side, and in this embodiment, the grass discharge passage 5 is connected to the front wall portion
, a rear wall portion 22 , and a cover 23 having an inverted U-shaped cross section. The cover 23 is curved into a gentle mountain shape when viewed from above, and its width in the front-rear direction is wider at the right terminal end than at the transfer starting end 21. When attaching the cover 23, as shown in FIG. 2, the front and rear side walls 23a and 23b of the cover 23 are overlapped with the front wall 3 and rear wall 222 of the mower deck 4, and fasteners made of bolts and nuts are attached. It is configured to be fixed by 25.

Long holes 24 in the vertical direction are bored in the front wall 3 of the mower deck 4 at appropriate intervals in the left-right direction.The bolts of the fasteners 25 are inserted into the long holes 24, and the cover 23 is fixed in the vertical direction. The movement can be adjusted accordingly. Reference numeral 26 shown in FIG. 3 is a plate that closes the elongated hole 24. In the figure, reference numeral 17 is a grass discharge port formed at the end of the grass discharge passage 5, and 20 is a roller attached to the mower deck 4.

In the above example, if you drive each rotating part and move the tractor forward while mowing the grass and lawn,
The grass and grass cut by the three cutting blades passes through the grass discharge passage 5 of the moadetsuki 4 and is discharged from the right discharge port 1.
Spit out from 7.

At this time, when the grass is long or the grass is dense, the grass may tend to accumulate in the grass discharge passage 5. In such a case, the fastener 25
is loosened and the cover 23 is pulled up within the range of the elongated hole 24 to enlarge the cross-sectional area of the grass discharge passage 5. On the other hand, if the cross-sectional area of the grass discharge passage 5 is too large compared to the amount of grass to be discharged, and the grass is not discharged from the discharge passage 5 to the outside of the mower deck 4 but is moved around inside the mower deck 4, it is necessary to remove the cover. Adjust to lower 23.

As mentioned above, in this example, plant height,
Since the cross-sectional area of the grass discharge passage 5 can be easily expanded or reduced by simply moving the cover 23 up and down according to the density, etc., the conventional operation of changing the working speed of the tractor is no longer necessary, increasing efficiency. Can work well.

[Effects of the invention] Since this invention is constructed as described above, the cross-sectional area of the grass discharge passage 5 can be easily adjusted according to the increase or decrease of the grass or grass cut in the mower 4, and the grass height, grass density, etc. This allows the mowing work to be carried out efficiently without being affected by this.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; FIG. 1 is a perspective view, FIG. 2 is a side sectional view of a portion thereof, and FIG. 3 is an enlarged side sectional view. Explanation of symbols: 1...Cutter blade, 3...Front wall, 4...
...Moadetsuki, 5... Grass discharge passage, 6... Vertical axis,
7...Blade part, 22...Rear wall part, 23...Cover.

Claims (1)

[Scope of utility model registration request] A plurality of vertical shafts 6 are mounted on a box-shaped mower deck 4 with an open bottom surface at appropriate distances in the left and right directions, cutting blades 1 are fixed to the lower portions of these vertical shafts 6, and the mower deck is mounted. The rotary mower is configured such that the rotating part is covered by the upper surface and side wall surface of the mower deck 4, and a grass discharge passage 5 is formed in the front part of the mower deck 4 for discharging the grass cut inside the mower deck 4 to the outside of the mower deck 4. In this, the grass discharge passage 5 is constituted by the front wall part 3 and the rear wall part 22 of the mower deck 4, and a cover 23 having an inverted U-shaped cross section, and the cover 23 is configured to be movable and adjustable in the vertical direction. A rotary mower characterized in that the cross-sectional area on the discharge side of the discharge passage 5 can be changed and adjusted.