JPH03133309A - Lawn mower - Google Patents

Abstract

PURPOSE:To prevent the lateral deviation of a cutting unit by crossing an axis of a connection pin connecting a side frame to the body of a lawn mower with an axis of a traction roller. CONSTITUTION:A pipe is curved in an U-shaped shape and the respective straight line portions of the pipe are kept in parallel while facing each other. A traction roller 16 is attached to the tips of the frame F prepared thus and a connecting pin 18 having a dropping portion is firmly attached to the center of the straight chain portion 17 of the frame F in such an inclined state to be lower than the straight line portion 17. The axis C1 of the pin 18 is crossed with the axis C3 of the roller 16, whereby when a cutting unit U is rotated on the axis C1 of the pin 18 in the direction of the arrow P1 in response to the inclination of the arrow T orthogonal to the troweling direction S of the mower body A, the unit U is prevented to deviate in the direction T.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lawn mower having a structure in which a cutting unit can freely follow the slope of the lawn surface to cut the lawn.

[Conventional technology]

As shown in FIGS. 9 to 11, a front roller 8 and a rear roller 9 are attached to the front and rear ends of a pair of side frames 6 that are connected at a predetermined interval, and both a cutting unit U in which a rotary blade 11 and a fixed blade 12 are mounted between rollers 8.9;
Frame F with a traction roller 16 attached to the front end
and; a vehicle body A provided with drive wheels l; and the front end of the cutting unit U is connected to the frame F so that the cutting unit U can follow the inclination along the traveling direction S toward the vehicle body. The rear end of the frame F is connected to the front end of the vehicle body A through a towing rod 24, and the rear end of the frame F is connected to the vehicle body A so that the cutting unit U can follow the inclination in the direction T perpendicular to the traveling direction S toward the vehicle body. Lawn mowers are known in which the cutting unit U is connected to the front part via a single connecting pin 18' and can cut the grass by freely following the slope of the grass surface.

However, in conventional lawn mowers, the axis C'l of the connecting pin 18' connecting the vehicle body A and the frame F is horizontal or close to this.

Therefore, when the cutting unit U rotates around the connecting pin 18' in response to the inclination along the direction T perpendicular to the traveling direction S toward the vehicle body, the cutting unit U rotates as shown in FIG. The traction roller 16 attached to the front end of the U deviates significantly in the lateral direction (direction T perpendicular to the traveling direction S of the vehicle body A), and correspondingly, the entire cutting unit U deviates greatly in the lateral direction. .

Here, the axis C°1 of the connecting pin 18° and the traction roller 1
6 and the axis C1 of the traction roller 16 is (H), and the inclination angle of the traction roller 16 is (θ), the amount of deviation of the traction roller 16 in the lateral direction is approximately (l(Xsinθ)). Become.

At a golf course, etc., a worker operating a lawn mower moves the lawn mower forward based on the side edge of the lawn to perform cutting work, so the cutting unit U is perpendicular to the traveling direction S of the vehicle body A. If there is a large deviation in the direction T, the side edges of the grass will deviate greatly from the normal position in this part, and when viewed from the whole, the side edges of the grass will partially meander, resulting in an extremely poor appearance of the cut surface.

[Problem to be solved by the invention]

The present invention provides a lawn mower having a structure in which the cutting unit can freely follow the inclination of the lawn surface and cut the lawn, in which the cutting unit is inclined along a direction perpendicular to the direction of movement of the vehicle body. This was done with the aim of aligning the side edges of the lawn and improving the appearance of the cut surface by preventing the canting unit from shifting significantly in the lateral direction.

(Means for Solving the Problems) A lawnmower according to the present invention has a front roller and a rear roller respectively attached to the front and rear ends of a pair of side frames connected at a predetermined interval, and It consists of a cutting unit in which a rotary blade and a fixed blade are installed between the rollers; a frame in which a traction roller is installed in the front end; and a vehicle body equipped with drive wheels; The front end of the cutting unit is connected to the front end of the frame via a traction rod so that it can follow the inclination along the direction, and the cutting unit ( ) can follow the inclination in the direction perpendicular to the direction of movement of the vehicle body. In order to be able to follow the slope, the rear end of the frame is connected to the front of the vehicle body via a single connecting pin, and the cutting unit can freely follow the slope of the lawn surface to cut more grass. In the lawn mower, the axial center of the connecting pin connecting the frame and the vehicle body intersects with the axial center of the traction roller attached to the front end of the frame. , or a state close to this.

[Action of the invention]

Since the axis of the connecting pin that connects the frame and the vehicle body and the axis of the traction roller attached to the front end of the frame intersect, or are close to this, Even on grass surfaces that are sloping in a direction perpendicular to the direction of movement of the vehicle, the traction roller attached to the front end of the cutting unit does not shift in the lateral direction at all, or even if it does, it does not shift. The amount becomes extremely small, and as a result, the amount of lateral displacement of the entire cutting unit 7) also becomes extremely small.

Therefore, even on grass surfaces that are slanted in a direction perpendicular to the direction in which the vehicle is moving, the operator operating the lawnmower can use the normal flat t! ! If you move the lawn mower forward using the side edges of the grass as a reference, you can mow the grass with the side edges aligned.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples.

In Figures 1 to 3, this lawnmower has a cutting unit U for cutting grass, and a frame F connected to the front part of the vehicle body A with the cutting unit U connected to the vehicle body. Consists of.

The vehicle body A is equipped with a drum-shaped drive wheel l, and an engine 2, which is a drive source, is mounted on one end in the width direction, and a power distributor 3 is attached to the other end. A gearbox 4 is installed inside the machine 3. The power generated from the engine 2 is transmitted to the power distributor 3 via the drive shaft 5, and the power distributor 3
The power is divided into power for rotating a drive wheel 1 attached to the vehicle body A and power for rotating a rotary blade 11, which will be described later, forming a cutting unit U.

The cutting unit U is connected to the vehicle body A via the frame F.
This is the part that is attached to the front of the lawn mower and cuts the grass at a predetermined cutting height.

A pair of side frames 6 of the cutting unit U are connected together at a predetermined interval, and a front roller 8 is attached to the front end of the cutting unit U via a tool 7, and a front roller 8 is attached to the side frame 6 at a height. The rear roller 9 is attached to the rear end so that its position can be adjusted. A rotary blade 11 and a fixed blade 12 are installed between the front roller 8 and the rear roller 9. The height of the rotary blade 11 relative to the ground surface is determined by the front roller 8 and the rear roller 9, and the mowing height of the lawn is determined. The height of cut changes. The fixed blade 12 is fixedly attached below the rotary blade 11, and the grass is cut and mowed by the double blades 11 and 12.

The rotary blade 11 receives the power distributed from the power distributor 3,
It is transmitted via a gear train in the gear box 4, a universal joint 14, and a gear train in a gear box (not shown) mounted on the left side frame 6.
The drive is rotated.

Frame F curves the pipe into a U-shape, and
It has a shape in which the linear parts, which are curved into a U-shape and are substantially parallel and facing each other, are curved in the same direction while maintaining parallelism. A traction roller 16 is attached to the tip of the frame F.
is attached, and a connecting pin 18 having a stepped part in the center of the straight part 17 of the frame F is fixed perpendicular to the straight part 17 and in an inclined state so that the front end is lower than the rear end. . The axis C1 of this connecting pin 18 is located at the frame F.
The axis C7 of the traction roller 16 attached to the tip of
The cutting unit U moves along the arrow P, centering on the axis C1 of the connecting pin 18, in response to the inclination in the direction T perpendicular to the traveling direction S of the vehicle body A. This design is to prevent the cutting unit U from shifting in the lateral direction (direction T perpendicular to the traveling direction S of the vehicle body A) when the cutting unit U rotates in the direction shown in FIG.

As shown in FIGS. 1, 2, and 5, a crosspiece 19 is fixed to the front of the vehicle body A along the width direction.
A connecting pipe fixing member 21 is vertically fixed to the center of the connecting pipe fixing member 9, and a connecting pipe 22 is fixed to the upper end of the connecting pipe fixing member 21 so as to be inclined in the same direction as the connecting pin 18.

A connecting pin 18 that is tilted and fixed to the straight part 17 of the frame F is inserted into a connecting pipe 22 that is tilted and fixed to the front part of the vehicle body A, and is prevented from coming out by a retaining pin 23. It is.

Further, the front end portions of traction bars 24 are pivotally attached to the front end portion of the frame F, and moreover, to both ends thereof, and the front roller mounting tool 7 is attached to the rear end portion of each traction bar 24. 25, thereby connecting the cutting unit U to the frame F (see FIG. 3).

Therefore, as shown in FIG.
It rotates in the direction of the arrow P with respect to the frame F, and rotates in the direction of the arrow P with respect to the frame F around the virtual axis C2 connecting the centers of the left and right joint balls 25.

It will rotate in the direction of. Therefore, the cutting unit U has a structure that rotates independently in two planes, so that it is possible to cut the grass by following almost any slope of the grass surface.

1 to 3, side frames 26 are also attached to both sides of the vehicle body A, and the spacing between the side frames 26 is approximately equal to the spacing between the side frames 6 of the cutting unit U. Each side frame 6.26 is provided with an arm 27 and a lifting lobe connection, as shown in cross-section in FIGS. 6 and 7. That is, the bolt pin 2 having a different diameter portion
9 protrudes outward from the inside of the side frame 6.26, a nut 30 is screwed into the threaded part 29a of this bolt pin 29 to fix it to the side frame 6.26, and the pin part 29b is provided at both ends of the arm 27. The arm 27 and the lifting row 128 are
Both ends of are connected. Note that the arm 27 and the lifting row 128 are
The connecting body 31 cannot be pulled out from the bolt pin 29.

An arm 27 connects the side frame 6 of the cutting unit U at approximately the center in the front-rear direction and at the upper end thereof to the front end of the side frame 26 to the vehicle body. This arm 27 has rigidity and is substantially horizontal when both side frames 6.26 are connected.

Further, the hole 27a of the arm 27 at the connecting portion with the side frame 6 of the cutting unit U has an elongated shape. This is because during the mowing operation, it is necessary to rotate the cutting unit U in the direction of the arrow Pg around the virtual axis C2 in response to the slope of the grass surface along the direction S toward the vehicle body. This is a design in which the hole 27a of the arm 27 is made into an elongated hole shape so that the above-mentioned movement of the canting unit U is not restricted.

Further, the rear end and lower end portion of the side frame 6 of the cutting unit U and the side frame 26 connected to the vehicle body are connected by a flexible lifting row 128. In this way, since the cutting unit U and the vehicle body A are connected at the part of the side frame 6 that constitutes the cutting unit U, the width of the two connecting parts is approximately equal to the width of the cutting unit U. It becomes the widest. As shown in FIG. 2, during the reaping operation, the lifting row 12 has a predetermined slack.

When mowing the lawn, please refer to Figures 1 and 2.
As shown in the figure, the lifting row 128 is slack and the arm 27 and side frame 26 are loosened as described above.
Since the hole 27a at the connecting part with the hole 27a is elongated,
Arrow P centered on the virtual axis Ct of the cutting unit U! Therefore, as mentioned above, the cutting unit U can rotate independently in two different planes to cut almost any slope of the grass surface. You can mow the lawn according to your needs.

Here, since the axis C1 of the connecting pin 18 that connects the frame F and the vehicle body A intersects the axis C3 of the traction roller 16 attached to the tip of the frame F, As shown by the two-dot chain line in Fig. 8, on the grass surface that is being swept along the direction T perpendicular to the traveling direction S of the vehicle body A, force and traction attached to the front end of the ting unit U are applied. Even if the roller 16 is tilted in accordance with the inclined surface, it will not shift at all in the lateral direction, and as a result, the amount of lateral shift of the entire force handling unit (U) will be extremely small.

Therefore, even on a lawn surface that is sloping in the direction T perpendicular to the direction S toward the lawn mower, the operator operating the lawn mower can operate the lawn mower in the same way as on a normal flat lawn surface. By moving the lawnmower forward based on the side edges, you can mow the lawn by moving the side edges over the edge.

Furthermore, in the above embodiment, the axis C5 of the connecting pin 18 connecting the frame F and the vehicle body A intersects with the axis C1 of the traction roller 16 attached to the tip of the frame F. However, even if the axis C1 of the connecting pin 18 and the axis C1 of the pulling roller 16 do not necessarily intersect, as long as they are close to each other, the cutting unit U can be moved in the lateral direction. Since the amount of deviation is almost non-existent or extremely small, substantially the same effects as described above can be achieved. In addition, in the figure, 34 indicates a handle attached to the vehicle body A.

〔Effect of the invention〕

The present invention is a lawn mower that is composed of a cutting unit, a frame, and a vehicle body, and is configured such that the cutting unit can freely follow the slope of the lawn surface to mow the lawn. The axis of the connecting pin and the axis of the traction roller attached to the tip of the frame intersect, or are close to this, so the Even on sloping grass surfaces, the traction roller attached to the front end of the cutting unit does not shift laterally at all, or even if it does shift, the amount of shift is extremely small.As a result, the cutting unit The overall amount of deviation in the lateral direction is also extremely small.

For this reason, even on grass surfaces that are sloping in a direction perpendicular to the direction of movement of the vehicle, the operator of the lawnmower must use the side edge of the lawn as a reference point in exactly the same way as on a normal flat lawn surface. By moving the lawn mower forward, you can mow the grass with the side edges aligned, which results in a better appearance of the cut surface.

[Brief explanation of the drawing]

1 to 8 are diagrams for explaining the present invention, in which FIG. 1 is a perspective view of a lawn mower according to the present invention, and FIG.
The figure is a right side view, FIG. 3 is a schematic plan view of the cutting unit U and body A of the lawn mower, and FIG. 4 is a side frame 6 of the cutting unit U and the side frame 26 of the body A. FIG. 5 is a plan view of the part where the frame F and the vehicle body A are connected by the lifting row 128.
6 and 7 are enlarged sectional views of the connecting portions of the side frame 6, the arm 27, and the lifting rope 28, respectively, and FIG. , is a schematic front view of the lawn mower for explaining that the cutting unit U does not shift laterally on an inclined surface along the direction T orthogonal to the traveling direction S of the vehicle body A. FIG. 9 to 11 are diagrams for explaining a conventional lawn mower, in which FIG. 9 is a right side view thereof, and the first θ diagram is
FIG. 11 is an enlarged cross-sectional view of the connecting pin 18' that connects the frame F and the vehicle body A, and shows that the cutting unit U is placed horizontally on an inclined plane along the direction T perpendicular to the traveling direction S of the vehicle body A. FIG. 2 is a schematic front view of a conventional lawn mower for explaining the large deviation in the direction. The explanations of the symbols of the main parts constituting the present invention are as follows. A: Vehicle body C1: Axis center of connecting pin C1 Axis center of two-chapter roller F: Frame S: Traveling direction of the vehicle body T: Direction perpendicular to the traveling direction of the vehicle body U: Cassoting unit 1%lK Driving wheel: Cutting unit: 11110-f; Rotating blade: Traction roller: Traction rod

Claims (1)

[Claims] A front roller and a rear roller are respectively attached to the front and rear ends of a pair of side frames that are connected at a predetermined interval, and a rotating blade and a fixed blade are installed between the two rollers. a cutting unit mounted on the vehicle; a frame having a traction roller mounted on the front end thereof; and a vehicle body equipped with driving wheels; The front end of the cutting unit is connected to the front end of the frame via a traction rod, and the rear end of the frame is connected to the front end of the frame so that the cutting unit can follow an inclination in a direction perpendicular to the traveling direction of the vehicle body. is connected to the front of the vehicle body via a single connecting pin, and the cutting unit can freely follow the slope of the lawn surface to mow the lawn, and the frame and The axial center of the connecting pin connecting to the vehicle body and the axial center of the traction roller attached to the front end of the frame intersect, or are in a state close to this. lawn mower.