JP2000188919A - Self-propelling mower, and mowing method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-propelling mower, designed to protect its cutter from an obstacle on the ground, and get over an obstacle to go forward. SOLUTION: This self-propelling mower is equipped with an impact-relaxing means 20, pivotally supported by a pin 5 to move in the vertical direction and attached to the front of a vehicle 2 having a pair of crawler 3. An attachment 10 having a cutter 13 below is fixed on the front end of the impact-relaxing means 20, and guard 30 is provided below the outer diameter D1 of the cutter 13, wherein the guard 30 is provided with at least 3 guides 31 of sled-like rod, arranged in parallel to each other in the forward direction, to allow the mower to get over an obstacle. The impact-relaxing means 20 is connected to the vehicle 2 by a lift cylinder 6, in such a way that the attachment 10 can move in the vertical direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-propelled mower and a method for mowing the same, and more particularly to a self-propelled mower for undercutting at a place having a large unevenness for cutting shrubs and weeds in a mountain forest. And its mowing method.

[0002]

2. Description of the Related Art When performing undercutting work such as shrubs and weeds in mountain forests, obstacles such as stones, rocks and cutting roots are hidden below,
The operator overlooks these and makes the cutter contact the obstacle,
There is a risk of damage. As an example of a self-propelled mower for undercutting to prevent this, Japanese Utility Model Application Laid-Open No. 61-92239 has been proposed.
There is a cutting blade protection device of a lower cutting reaper in which a hard comb-shaped body is hung in front of a supply port of the cutting blade device presented in the above publication.

As another example, FIG. 10 shows an external perspective view of a conventional self-propelled mower 100. At the front of the vehicle body 2 having a pair of right and left crawlers 3, an attachment 101 in which a cutter (not shown) is provided is attached so as to be movable up and down. A pair of sled-shaped guards 103, 103 are provided on both sides of the cutter cover 102 of the attachment 101, and the lower end of the guard 103 is positioned below the outer diameter of a cutter (not shown), and the guard 103 is grounded. To prevent contact with obstacles and protect the cutter.

[0004]

However, the above configuration has the following problems. (1) In the apparatus disclosed in Japanese Utility Model Application Laid-Open No. 61-92239, a hard comb is hung in front of the supply port of the cutting blade device, so that obstacles such as pebbles are eliminated to protect the cutting blade. However, it is impossible to get over it when it comes into contact with a root or the like, and there is a problem that the vehicle stops and the work efficiency is reduced. (2) In another example, since the sled-shaped guards are provided on both sides of the attachment, an obstacle located in the middle of the left and right guards may directly contact the cutter, and may damage the cutter. It may not be possible to get over a slightly larger obstacle.

The present invention has been made in view of the above problems, and relates to a self-propelled mower and a mowing method thereof.
In particular, it can move over obstacles in front of the attachment while protecting the cutter while protecting the cutter.Also, it can reduce the impact when it comes into contact with obstacles to prevent damage to the attachment and follow the terrain. It is an object of the present invention to provide a self-propelled mower with high work efficiency, which can move forward.

[0006]

In order to achieve the above object, a first invention of a self-propelled mower according to the present invention comprises a cutter for cutting shrubs, weeds and the like in front of a vehicle body. In a self-propelled mower having an attachment with a guard for protecting the cutter, the guard moves over the obstacle when it comes into contact with the obstacle, so that the guard is parallel in the traveling direction and between the cutter. And a guide for rolling or sliding. According to the above configuration, since the guard that protects the cutter is directed in the traveling direction and a guide that rolls or slides is provided between the cutters, an obstacle such as a cutting root is present in the middle portion in the width direction of the attachment. The guard abuts against the obstacle and can move over the obstacle by the guide, so that the protection of the cutter and the continuity of the work are ensured, and the work efficiency is improved.

A second invention relates to a self-propelled mowing machine having an attachment provided with a cutter for cutting shrubs, weeds and the like in front of a vehicle body and a guard for protecting the cutter, when the guard comes into contact with an obstacle. The shock absorber is configured to move the attachment backward by a predetermined amount with respect to the vehicle body to reduce the shock. According to the above configuration, when the guard comes into contact with the obstacle, the attachment moves rearward by a predetermined amount, so that the impact of the collision is reduced and the attachment and the cutter are prevented from being damaged.

According to a third aspect of the present invention, there is provided a self-propelled mowing machine having an attachment including a cutter for cutting shrubs and weeds in front of a vehicle body and a guard for protecting the cutter, when the guard comes into contact with an obstacle. The shock absorber is configured to move the guard backward by a predetermined amount with respect to the vehicle body to reduce the shock. According to the above configuration, when the guard comes into contact with the obstacle, the guard moves rearward by a predetermined amount, so that the impact of the collision is reduced, and the attachment and the cutter are prevented from being damaged.

According to a fourth aspect of the present invention, in the self-propelled mower according to the second or third aspect, an automatic vehicle stopping means for stopping the vehicle when the guard comes into contact with an obstacle and the attachment or the guard moves backward by a predetermined amount. Configuration. According to the above configuration, when the guard comes into contact with a large rock or the like and cannot be climbed over, the impact at the time of contact is reduced, and the vehicle stopping means stops the vehicle. Therefore, no excessive load is applied to the vehicle or the attachment, and the attachment or the cutter is prevented from being damaged.

According to a fifth aspect of the present invention, there is provided a self-propelled mower having an attachment provided with a cutter for cutting shrubs and weeds in front of a vehicle body and a guard for protecting the cutter. It has a configuration that has a copying mechanism that contacts the ground with a load smaller than the own weight of the attachment and moves along the ground. According to the above configuration, since the attachment rises with a small pushing load, the responsiveness is good, and the guard can always move while following the ground so that the cutting height can be secured according to the ground, and a good mowing operation can be performed. Can be.

According to a sixth aspect of the present invention, in the self-propelled mower according to the first aspect of the present invention, the guard comprises a disk appropriately inserted between a plurality of cutters arranged in parallel with the cutter shaft. . According to the above configuration, since the disc-shaped guard is appropriately inserted between the cutters, the guards are arranged near the cutters, and the cutters can be protected against obstacles at arbitrary positions.

According to a seventh aspect of the present invention, in the self-propelled mower according to the sixth aspect of the present invention, the disk-shaped guide is rotatably attached to the cutter shaft. According to the above configuration, since the disk serving as the guard is rotatable around the cutter axis, it is easy to get over obstacles and the workability is improved.

According to an eighth aspect of the present invention, in the self-propelled mower of the first aspect, the guard covers the cutter, is disposed in parallel in the traveling direction, and is appropriately inserted between the plurality of cutters. It is configured as a framework composed of sleigh-shaped bar guides. According to the above configuration, since the guard is a frame formed by a sled-shaped bar guide inserted between a plurality of cutters as appropriate, the guide also comes into contact with an obstacle in the middle portion in the width direction. In addition to preventing breakage of the cutter, obstacles can be easily overcome and workability is improved.

A first invention of a method for mowing a self-propelled mower is directed to a self-propelled mower having an attachment provided with a cutter for cutting shrubs and weeds in front of a vehicle body and a guard for protecting the cutter. When the guard follows the ground and comes into contact with an obstacle, the disk disposed between the cutters rolls, or the guide of the sled-shaped bar disposed between the cutters It is a method of mowing by sliding and going over this obstacle. According to the above-described method, the attachment gets over obstacles and follows the ground, so that the driving operation is extremely easy, and the mowing work can be continuously performed without stopping the vehicle, thereby improving workability.

A second invention of the first invention of the mowing method of the self-propelled mower is a mowing method in which the guard touches the ground with a lighter weight than the attachment's own weight and moves along the ground. According to the above method, the attachment rises with a small lifting load, so that the responsiveness is good, and the guard always moves while following the ground so that the cutting height can be secured according to the ground, and a good mowing operation can be performed. Can be.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a self-propelled mower according to the present invention will be described below in detail with reference to FIGS. FIG. 1 is a side view of a self-propelled mower 1 provided with a shock absorbing means 20 of the first embodiment, and FIG. 2 is a plan view. An attachment 10 is attached to a bracket 4 provided in front of the vehicle body 2 having a pair of right and left crawlers 3 and 3 by a connecting pin 5 so as to be rotatable in a vertical direction. The left and right crawlers 3, 3 are driven by a left traveling hydraulic motor 55 and a right traveling hydraulic motor 56, respectively. The attachment 10 includes a hammer knife type cutter 13 and a cutter shaft 1.
1, a cutter cover 12 surrounding a hammer knife type cutter 13 rotatably attached thereto, shock absorbing means 20 connecting the cutter cover 12 and the bracket 4, and a cutter cover 12
And a guard 30 attached to the arm. The shock absorbing means 20 and the vehicle body 2 are connected by the lift cylinder 6, and the shock absorbing means 20
Rotates about the connecting pin 5, and the attachment 10
Up and down.

A guard 30 is provided between the hammer knife type cutters 13 in parallel in the traveling direction and between the hammer knife type cutter 13 and a guide 31 of a sled-shaped bar, and a connecting member for connecting the guide 31. 32, and a pair of brackets 34, 34 fixed on both sides of the frame 33 are provided with bolts 35 on both sides of the cutter cover 12.
It is fastened by. At this time, it is desirable that at least three or more guides 31 are appropriately disposed between the hammer knife type cutters 13 in order to ride a slightly large stone. The bottom surface of the guide 31 projects below the outer diameter D1 of the cutter 13,
Grounds and protects the cutter 13 from obstacles. When there is an obstacle such as a stone or a cutting root on the ground, the guide 31 is shaped like a sled with a large inclination on the front side, and is appropriately disposed between the hammer knife type cutter 13. You can easily get over and move on. Moreover, since the guides 31 are arranged at predetermined intervals in the width direction so as to get over a slightly large stone or an obstacle and to protect the hammer knife type cutter 13, the guide 31 comes into contact with most obstacles, The work can be continued without stopping the vehicle, and the workability is improved.

FIG. 3 is a side sectional view of the shock absorbing means 20 of the first embodiment, and FIG. 4 is a view taken along the line AA of FIG. 3 and 4, one end of an outer cylinder 21 is attached to the bracket 4 by a connecting pin 5 so as to be rotatable in the vertical direction. The outer cylinder 21 has a rectangular cross section, and the inner cylinder 2 having a rectangular cross section having a liner 23 on the outer peripheral portion from the open end.
2 are slidably inserted. A lid 24 is fixed to the distal end of the inner cylinder 22, and a flange 25 is fixed to the proximal end of the inner cylinder 22, and is fastened to the cutter cover 12 by bolts 26. The inner cylinder 22 and the outer cylinder 21 are constantly urged in the extending direction by a spring 27 provided in the inner cylinder 22.
The relative position of the inner cylinder 22 and the inner cylinder 22 in the length direction is regulated by a rod 28 connecting the inner cylinder 22 and the outer cylinder 21. When an external force in the direction of arrow X is applied to the attachment 10 from the front, the spring 27 contracts, and the inner cylinder 22 slides and moves inside the outer cylinder 21. Its maximum stroke is L1. Guard 3
When 0 touches an obstacle in front and a large external force is applied, the attachment 10 moves backward by a predetermined amount to reduce the impact of the collision and prevent the attachment 10 from being damaged.

An automatic vehicle stopping means 80 is provided on the upper surface of the outer cylinder 21.
Are provided. A wedge 42 having a slope 43 at one end is slidably provided in a longitudinal direction in a case 41 of the collision detector 40, and a rod 44 at the other end of the wedge 42 is connected to the flange 25 of the inner cylinder 22. I have.
A limit switch 45 is attached to the upper part of the case 41, and when the wedge 42 moves, the slope 43 comes into contact with the limit switch 45 to be turned on. The movement amount is L2, and is set to a predetermined value smaller than the maximum stroke L1 of the first shock absorbing means 20.

FIG. 5 is a sectional view of the cutter shaft 11 showing the guard 30a. The cutter shaft 11 is rotatably attached to the cutter cover 12 by a bearing 14. A plurality of hammer knife type cutters 13 are attached to the cutter shaft 11 in parallel, and three or more disk type guides 36 are appropriately disposed between them. The guide 36 is rotatably attached to the cutter shaft 11 via a bearing 37, and forms a guard 30a. The outer diameter D2 of the guide 36 is set larger than the outer diameter D1 of the cutter 13, and the guide 36 is grounded to protect the cutter 13. When the guide 36 comes into contact with an obstacle, the guide 36 can rotate over the obstacle with a small resistance because the guide 36 is rotatable.
Arranged between 3 as needed to contact most obstacles,
Damage to the cutter can be prevented.

Next, the hydraulic device of the self-propelled mower 1 will be described. FIG. 6 is a hydraulic circuit diagram. The engine 50 drives a variable displacement hydraulic pump 51 for left running and a hydraulic pump 52 for right running. At the same time, the charging hydraulic pump 53 and the working machine hydraulic pump 54 are driven. The left traveling hydraulic pump 51 constitutes a closed circuit with the left traveling hydraulic motor 55, and the right traveling hydraulic pump 52 constitutes a closed circuit with the right traveling hydraulic motor 56. Hereinafter, a hydraulic device for a working machine will be described. A copying mechanism 70 is provided between the lift cylinder 6 for raising and lowering the attachment 10 and the hydraulic pump 54 for the work implement, for moving the guard 30 of the attachment 10 forward while grounding while following the ground. That is, the lift cylinder 6 and the working machine hydraulic pump 54 are connected via the electromagnetic directional switching valve 60. The directional control valve 60 has a neutral (N) position, an up (A) position, and a down (B) position.
1 and 61 are held in the neutral position. Neutral (N)
In the position, the discharge circuit 58 of the working machine hydraulic pump 54 and the oil tank 57 are connected by the tank circuit 59, and the up side circuit 62 connected to the bottom side of the lift cylinder 6 and the down side connected to the head side of the lift cylinder 6. Circuit 63
Are blocked together. Between the raising circuit 62 and the lower circuit 63, a circuit relief valve 64 for limiting the hydraulic pressure when the attachment 10 is raised and lowered is interposed. The relief pressure P1 of the circuit relief valve 64 is, for example, 140 kg / c.
a m ^2. A flow control valve 71 for adjusting the descent speed of the attachment 10 and an electromagnetic poppet valve 74 for holding the attachment 10 are provided on the raising circuit 62. The flow control valve 71 includes a one-way valve 72 that opens toward the lift cylinder 6 and a variable throttle 73 that is disposed in parallel with the one-way valve 72.
It is composed of The holding electromagnetic poppet valve 74 has a C position having a one-way valve 75 that opens toward the lift cylinder 6 and a D position communicating a circuit, and is normally held at the C position by a spring 76. A relief safety valve 66 is provided on a first branch circuit 65 that branches off from the up-side circuit 62 and connects to the tank circuit 59. The relief pressure P2 of the relief safety valve 66 is, for example, 210 kg / cm ² .
In addition, a floating electromagnetic poppet valve 77 and a relief valve 68 are interposed on a second branch circuit 67 that branches off from the up-side circuit 62 and connects to the tank circuit 59. The relief pressure P3 of the relief valve 68 is set to, for example, 60 kg / cm ² . The floating electromagnetic poppet valve 77 has an E position provided with a two-way check valve 78 and an F position communicating a circuit, and is normally held at the E position by a spring 79.

Next, the operation of the hydraulic device for the working machine will be described. When the attachment 10 is raised, the direction switching valve 60 is raised to the (A) position. The hydraulic oil of the working machine hydraulic pump 54 is lifted from the discharge circuit 58 through the direction switching valve 60, the one-way valve 75 of the holding electromagnetic poppet valve 74 and the one-way valve 72 of the flow control valve 71, and lifted from the up-side circuit 62. It is supplied to the bottom side of the cylinder 6, and the lower circuit 63 of the lift cylinder 6 is connected to the tank circuit 59 via the direction switching valve 60. Accordingly, the lift cylinder 6 extends to raise the attachment 10. The maximum pressure of the circuit at this time is the relief pressure P of the circuit relief valve 64.
It is one.

When stopping after raising the attachment 10, the directional control valve 60 is set to the neutral (N) position.
Lifting circuit 62 and lowering circuit 6 of lift cylinder 6
3 is closed, and the attachment 10 is in a holding state.
The pressure oil in the raising circuit 62 on the bottom side of the lift cylinder 6 is prevented from leaking by the one-way valve 75 of the holding electromagnetic poppet valve 74, so that the attachment 10 does not drop during running or the like. Vibration during traveling or attachment 1
If the lift cylinder 6 is stopped while ascending and descending 0,
High pressure may be generated on the bottom side of the lift cylinder 6. The maximum pressure at that time is the relief pressure P2 of the relief safety valve 66.

When the attachment 10 is lowered, the direction switching valve 60 is set to the lowered (B) position and the holding electromagnetic poppet valve 74 is set to the D position. The pressure oil of the working machine hydraulic pump 54 is supplied from the discharge circuit 62 via the direction switching valve 60 to the head side of the lift cylinder 6 through the lower circuit 63, and the oil in the lift circuit 6 of the lift cylinder 6 is supplied to the flow control valve The directional control valve 60 passes through the variable throttle 73
Is connected to the tank circuit 59 via the. Therefore, the lift cylinder 6 is shortened, and the attachment 10 is lowered. At this time, the descending speed of the attachment 10 can be adjusted by adjusting the aperture of the variable aperture 73. The maximum oil pressure during this time is the relief pressure P1 of the circuit relief valve 64.

At the time of mowing, the attachment 10 is lowered and the guard 30 is grounded.
At the same time, the holding electromagnetic poppet valve 74 is returned to the C position, and the floating electromagnetic poppet valve 77 is switched to the F position. Alternatively, the direction switching valve 60 is switched to the (A) position, and at the same time, the holding electromagnetic poppet valve 74 is returned to the C position, and the floating electromagnetic poppet valve 77 is switched to the F position, thereby lowering the attachment 10 by its own weight, and 30 is grounded. The lowering circuit 63 is connected to the tank circuit 59 via the direction switching valve 60. The discharge circuit 58 of the working machine hydraulic pump 54 is connected to the raising circuit 62 and to the second branch circuit 67. Therefore, the working machine hydraulic pump 5
The discharge oil pressure of No. 4 is the relief pressure P2 of the relief valve 68. The above-described relief pressure P2 of the relief valve 68 is set to a pressure that holds approximately 2/3 of the total weight of the attachment 10, and therefore, the guard 3 of the attachment 10
0 is pressed against the ground with a force of about 1/3 of the total weight of the attachment 10. Therefore, the attachment 10
It rises with a small force and the response is good. In particular, since the discharge circuit 58 of the working machine hydraulic pump 54 is connected to the lifting-side circuit 62, the attachment 1
Since 0 rises immediately with a small force, obstacles can be easily overcome. Therefore, the guard 30 moves while touching the ground in accordance with the terrain, and the mowing work can be performed at a height according to the ground, so that an efficient mowing operation can be performed.

Next, a method of mowing the self-propelled mower 1 of the present invention will be described. When moving to the mowing point, the operator raises the lift cylinder 6 by raising the direction switching valve 60 to the (A) position, and raises the attachment 10.
After the attachment 10 reaches the predetermined position, the directional control valve 60 is set to the neutral (N) position to keep the lift cylinder 6 in the holding state, and move to the predetermined position. After arriving at the mowing expected place, the operator lowers the directional control valve 60 to the (B) position,
The attachment 10 is lowered with the holding electromagnetic poppet valve 74 at the D position. Alternatively, similarly to the above, the direction switching valve 60 is raised to the (A) position, and the holding electromagnetic poppet valve 74 is set.
To the C position, and set the floating electromagnetic poppet valve 77 to F
In this position, the attachment 10 is lowered by its own weight, and is brought into contact with the guard 30. After the guard 30 is grounded, the direction switching valve 60 is raised to the (A) position, the holding electromagnetic poppet valve 74 is at the C position, and the floating electromagnetic poppet valve 7 is
7 is set to the F position to bring the attachment 10 into a floating state. Next, the cutter shaft 11 is rotated to move forward.
The attachment 10 advances while touching the ground following the terrain as described above, and moves forward over obstacles.

Next, the vehicle automatic stopping means 80 of the self-propelled mower 1 will be described. FIG. 7 is a block diagram of the vehicle automatic stopping means 80. The control device 81 is connected to the collision detector 40 described with reference to FIG. 82, a left servo motor 83 and a right servo motor 84 for controlling the swash plate angles of the variable displacement hydraulic pumps 51 and 52 for right and left travel.
Connected to

The operation will be described below. As described above for the collision detector 40, when the guard 30 of the attachment 10 comes into contact with an obstacle and the attachment 10 retreats by a predetermined amount (L2) with respect to the vehicle body 2, the limit switch 45
Becomes ON. The control device 81 receives this signal, outputs a signal to the travel stop indicator light 82 and turns it on to notify the operator that the attachment 10 has hit an obstacle that cannot be climbed over. At the same time, a control signal is output to the left servo motor 83 and the right servo motor 84, the swash plate angles of the left and right traveling hydraulic pumps 51 and 52 are set to 0, the discharge amount of the hydraulic pumps is set to 0, and the traveling of the vehicle is stopped. The operator confirms that the travel stop indicator lamp 82 is lit, and takes a predetermined action.
This prevents an unreasonable external force from being applied to the attachment 10, so that there is no possibility of breakage.

FIG. 8 is a side view of the attachment 10a provided with the shock absorbing means 20a of the second embodiment. The other end of the arm 15 having one end fixed to the cutter cover 12 of the attachment 10 a is rotatably attached to a bracket 4 fixed to the vehicle body 2 by a connecting pin 5. The arm 15 and the vehicle body 2 are connected by the lift cylinder 6,
The attachment 10 moves up and down by the expansion and contraction of the lift cylinder 6. A guard 30 is provided below the cutter cover 12, and the guard 30 is attached to both side surfaces of the cutter cover 12 via a pair of impact mitigation means 20a of the second embodiment. In addition, a collision detector 40 is attached to an upper portion of the shock absorbing means 20a on one side surface of the cutter cover 12.

FIG. 9 is a detailed sectional view of the shock absorbing means 20a and the collision detector 40. A case 90 is fixed to a side surface of the cutter cover 12 of the attachment 10.
The brackets 34 fixed on the front and rear sides of the frame 32 of the guard 30 are connected via pins 93 and 93 by a rod 91 having a flange 92 at a substantially central portion. The rod 91 including the flange 92 is connected to a case 90. Is slidably housed in the housing. A spring 94 is provided between one end surface of the flange 92 and one inner surface of the case 90, and constantly biases the guard 30 forward. Above the case 90 on the side surface of the cutter cover 12, the collision detector 40 described with reference to FIG.
The rod 44 of the wedge 42 is connected to the front of the guard 30.

Next, the operation of the shock absorbing means 20a will be described. As described above, the guard 30 is supported by the case 90 via the rod 91, and is urged forward by the spring 94. When the gart 30 comes into contact with an obstacle in front, the guard 30 compresses the spring 94 and moves rearward with respect to the cutter cover 12 to reduce the impact of the collision. Guard 3
The maximum stroke of 0 is L1. At the same time collision detector 4
The 0 wedge 42 moves backward, and when the movement amount reaches a predetermined value L2, the limit switch 45 is turned ON,
As described above, the vehicle automatic stopping means 80 operates to stop the vehicle, thereby preventing the attachment 10 from being damaged. In the above embodiment, a limit switch is used, but a stroke sensor is provided in a cylinder or an impact buffer,
You may make it detect by a stroke.

[Brief description of the drawings]

FIG. 1 is a side view of a self-propelled mower according to the present invention.

FIG. 2 is a plan view of the self-propelled mower of the present invention.

FIG. 3 is a side sectional view of the shock absorbing means of the first embodiment.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a front sectional view of a cutter shaft.

FIG. 6 is a hydraulic circuit diagram of the self-propelled mower of the present invention.

FIG. 7 is a block diagram of a vehicle automatic stopping means of the self-propelled mower according to the present invention.

FIG. 8 is a side view of an attachment having a shock absorbing unit according to a second embodiment.

FIG. 9 is a side cross-sectional view of the shock absorbing means of the second embodiment.

FIG. 10 is an external perspective view of a conventional self-propelled mower.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Self-propelled mower, 2 ... Body, 4 ... Bracket, 5 ... Connection pin, 6 ... Lift cylinder, 10a ... Attachment, 11 ... Cutter shaft, 12 ... Cutter cover, 13 ...
Cutter, 14, 37 ... bearing, 15 ... arm, 20, 20
a: Impact relaxation means, 21: outer cylinder, 22: inner cylinder, 27, 9
4 Spring, 28, 91 Rod, 30, 30a Guard, 31, 36 Guide, 40 Collision detector, 41, 9
0 ... case, 42 ... wedge, 45 ... limit switch,
54 ... Hydraulic pump for working machine, 60 ... Direction switching valve, 68 ...
Relief valve, 70: copying mechanism, 71: flow control valve, 73
... variable throttle, 74 ... holding electromagnetic poppet valve, 77 ... floating electromagnetic poppet valve, 80 ... vehicle automatic stop means, 81 ... control device.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Haruo Hiruma 2-142-1, Sakuragaoka, Higashiyamato-shi, Tokyo F-term in Komatsu Zenoa Co., Ltd. (Reference) 2B076 AA01 DA15 EA01 EB05 EC21 ED01 ED22 2B083 AA01 BA11 BA15 GA01 HA06 HA33 HA34 HA53 HA60 2B085 AA05 AC12 BA12 BC10 BE11 BE13

Claims (10)

[Claims] A self-propelled mowing machine having an attachment (10) provided with a cutter (13) for cutting shrubs, weeds and the like in front of a vehicle body (2) and a guard for protecting the cutter (13), The guides (31, 36) which are parallel in the direction of travel and which roll or slide between the cutters (13), because the guards (30, 30a) advance over obstacles when they come into contact with obstacles A self-propelled mowing machine characterized by having: 2. A self-propelled mower having an attachment (10) provided with a cutter (13) for cutting shrubs and weeds in front of a vehicle body (2), and a guard for protecting the cutter (13). When the guard (30, 30a) comes into contact with an obstacle, the shock absorbing means (20) for moving the attachment (10) to the rear of the vehicle body (2) by a predetermined amount to reduce the impact is provided. Self-propelled mower. 3. A self-propelled mowing machine having an attachment (10) provided with a cutter (13) for cutting shrubs, weeds and the like in front of a vehicle body (2) and a guard for protecting the cutter (13). When the guard (30) hits an obstacle, the guard (30) is
(2) A self-propelled mowing machine characterized by having a shock absorbing means (20a) for moving a predetermined amount backward with respect to (2) to mitigate the impact. 4. A self-propelled mowing machine according to claim 2, wherein the guard (30) comes into contact with an obstacle and the attachment (1).
0) or a self-propelled mowing machine having automatic vehicle stopping means (80) for stopping the vehicle when the guard (30) moves backward by a predetermined amount. 5. A self-propelled mower having an attachment (10) provided with a cutter (13) for cutting shrubs and weeds in front of a vehicle body (2) and a guard for protecting the cutter (13). Self-propelled mowing, characterized in that the attachment (10) is lowered by its own weight, and the guard (30) has a copying mechanism (70) that contacts the ground with a load smaller than the own weight of the attachment (10) and moves along the ground. Machine. 6. The self-propelled mower according to claim 1, wherein the guard (30a) is appropriately inserted between a plurality of cutters (13) arranged in parallel with the cutter shaft (11). A self-propelled mower characterized by being made of a disc. 7. The self-propelled mowing machine according to claim 6, wherein the guide (36) made of a disc is rotatably attached to the cutter shaft (11). Machine. 8. The self-propelled mower according to claim 1, wherein the guard (30) covers the cutter (13), is arranged in parallel in the traveling direction, and has a plurality of cutters (13). A frame (3) consisting of a sled bar guide (31) inserted as appropriate
3) A self-propelled mowing machine characterized in that: 9. A mowing machine of a self-propelled mowing machine having an attachment (10) provided with a cutter (13) for cutting shrubs, weeds and the like in front of a vehicle body (2) and a guard for protecting the cutter (13). In the method, when the guards (30, 30a) follow the ground, and when they come into contact with an obstacle, the disk disposed between the cutters rolls or is disposed between the cutters. A mowing method for a self-propelled mowing machine, wherein a sled-shaped bar guide slides over the obstacle. 10. A mowing method for a self-propelled mower according to claim 9, wherein the guards (30, 30a) contact the ground with a weight lighter than the weight of the attachment (10), and follow the ground. Characteristic mowing method of self-propelled mower.