JPH05284834A - Lawn mower - Google Patents

Abstract

PURPOSE:To provide a lawn mower capable of switching from walking-steering to riding-steering, so excellent in workability as to be free from a fear about contact of the foot with the machine body in the case of the walking steering and so improved in safety as to be free from a fear about injury caused by contact of the steering handle with a foreign object in the case of riding-steering. CONSTITUTION:A driver's seat (A) is set above the intermediate part between the front and rear wheels 3 and 4 of the running car body equipped with a mower 5. A steering handle 9 for walking steering from the back side of the machine body is attached to the rear end part of the machine frame 1. The steering handle 9 is designed so that the control grip 9a may be freely turned from the walking-steering position behind the rear end part of the machine frame 1 to the position of a housing existing on the forward side of the rear end part of the machine frame 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lawnmower, and more particularly to a lawnmower capable of adopting both a riding control mode and a walking control mode.

[0002]

2. Description of the Related Art In the lawn mowers described above, conventionally, there has been a structure in which a walking and steering handle is arranged at a rear portion of a machine body in a fixed position so as to project rearward and upward.

[0003]

With the above-described structure, when the lawn mowing work site is in a flat state, the aircraft can be operated in the riding type control mode which is seated on the driver's seat located between the front and rear wheels. In addition, it reduces the work effort of walking for a long time when the work area is large, and when there is a lot of unevenness and the aircraft is unstable in the riding control mode and it is dangerous, it is possible to work safely in the walking control mode. It has been taken into consideration. However, in the above conventional structure,
Since the walking control handle is provided so as to project rearward from the rear end of the machine body, in the walking control mode,
Since the control grip is located at a position rearward and upward from the rear end of the traveling body, there is an advantage that the foot is less likely to come into contact with the body during walking and workability is excellent, but in such a state When working in the riding control mode, if there are obstacles such as standing trees or walls at the work location, the walking control handle that protrudes far behind may come into contact with and damage these obstacles, and there is room for improvement. was there. The present invention aims to eliminate the above-mentioned problems.

[0004]

A feature of the present invention is that a boarding operation section is provided above an intermediate portion of front and rear wheels of a traveling vehicle equipped with a mower, and walking control is performed from a rear side of the vehicle body at a rear end portion of the vehicle body frame. And a stowage position in which the grip operation portion is located rearward of the rear end of the body frame and the frontward of the rear end of the body frame. The point is that it can be freely rotated.

[0005]

[Operation] When the vehicle is maneuvered from the rear side of the aircraft, by setting the steering handle to the walking maneuvering position, the feet do not come into contact with the traveling aircraft to hinder walking while maneuvering, resulting in excellent workability. When the riding control mode is adopted, the control handle is rotated to the retracted position to enter the front side of the rear end of the body frame. It is possible to prevent damage to the steering handle due to contact with an obstacle such as a wall. Further, if a fall-prevention ground guide portion that projects rearward from the rear end of the machine body frame at the storage position is provided below the rotation axis of the steering handle, When traveling on a sloping ground in the riding control mode, if there is a risk of the vehicle body falling over toward the rear, the ground contact guide unit can prevent the vehicle from tipping over in advance, and in the walking operating mode, The ground contact guide portion will enter the inside of the aircraft as the steering handle is rotated, and will not interfere with walking control.

[0006]

Therefore, it is possible to use the riding control mode and the walking control mode properly, and there is little possibility that the foot touches the body during the walking control, and the workability is excellent while the riding control is performed. In the form, it is possible to make the steering handle less likely to be damaged by contact with an obstacle,
We were able to improve safety. Moreover, if the turning structure of the steering handle is effectively used to provide the grounding guide portion, the steering safety in the riding maneuvering mode can be achieved without lowering workability and significantly complicating the structure. Can be further increased.

[0007]

Embodiments will be described below with reference to the drawings. Figure 1
Shows a lawnmower. This lawnmower has a vertically oriented output shaft 2 at a rear portion of a machine body frame 1 arranged in a longitudinal direction of the machine body.
The engine 2 equipped with a
A pair of left and right drive rear wheels 3 and 3 are provided on the lower side of the vehicle, and a pair of left and right caster wheel type front wheels 4 and 4 are provided on the lower side of the front end of the machine body frame 1, and the front and rear wheels 3 and 4 are intermediate. The mower 5 is attached to the lower abdomen of the machine body so that the vertical position can be adjusted.
In addition, a boarding driver's seat 7 is supported by a supporting member 6 standing upright from the body frame 1 at a location on the front side of the engine 2, and a boarding driver's seat A is provided. Only step 8 is provided so as to improve the forward field of view when the driver is seated. Further, a walking control handle 9 is extended from the rear portion of the vehicle body frame 1 toward the upper rear side of the vehicle body to configure a walking control section B capable of performing walking control from the rear side of the vehicle body.

Power is transmitted from the output shaft 2a of the engine 2 to the left and right hydrostatic continuously variable transmissions H, H via the transmission belt 10, and from another transmission belt 11 via the vertically extending relay shaft 12. The transmission system is configured to supply power to the mower 5. Each of the rear wheels 3 and 3 is configured to be driven by a hydrostatic continuously variable transmission H, H on each of the left and right sides, and each continuously variable transmission H, H is connected to the boarding operation unit A.
Further, each of the walking control section B is configured to be capable of traveling control. That is, as shown in FIG. 3, the transmission arms 14, 14 integrally rotatably attached to the transmission operating shafts 13, 13 of the continuously variable transmissions H, H and the transmission operating shafts 13, 13 are rotatable relative to each other. The externally fitted operation arms 15 and 15 are linked by springs 16 and 16 so as to be capable of following operation, and the operation arms 15 and 15 are connected to the shift pedal 1 in the boarding operation section A.
7 and the gear shift operation lever 18 provided on the walking control section B are linked so that they can be operated. The operation arms 15 and 15 are configured to rotate in the speed increasing operation direction from the neutral position of the continuously variable transmission H to the forward side by operating either the speed change pedal 17 or the speed change operation lever 18.
Along with the rotation, the speed change arms 14, 14 follow the rotations via the springs 16, 16 and the left and right rear wheels 3, 3 are moved forward and at substantially the same speed. And each shift arm 1
Reference numerals 4 and 14 denote the grip operation portion 9 of the control handle 9.
By a grip operation of one of the left and right grip operation levers 19 and 19 or the grip operation levers 20 and 20 disposed in the boarding operation section A, the continuously variable transmission H moves in the direction from the neutral position toward the deceleration side. It is linked so that it can be rotated,
For example, when the vehicle is traveling straight ahead in the forward direction by operating the shift operation lever 18, when one of the grip operation levers is operated, the operated shift arm 14 is operated toward the deceleration side against the spring force. It becomes possible to turn. or,
When the grip operation levers 19, 19 are operated with a large grip from the neutral stop state, the reverse operation state is set. The gear shift operation lever 18 is constructed so that it can hold its position at an arbitrary operation position by interposing a friction holding portion by a disc spring in the middle of linkage. The grip operation levers 19 and 19 for walking and manipulating are linked via a link link 21 and a relay rotation member 22 which is rotatably supported around a horizontal axis, and the shift operation lever 18 is similarly linked link 23. Also, they are linked through the relay rotation member 24. Similarly, the walking control side operation tool 25 of the belt tension clutch C for the mower 5 is also linked via the link link 26 and the relay rotation member 27. The relay link members 22, 24, 27 are arranged so as to rotate about the same horizontal axis X. The steering handle 9 has a walking steering position in which the grip operating portion 9a is located rearward of the rear end 1a of the body frame 1, and a retracted position in which the grip operating portion 9a is located in front of the rear end 1a of the body frame 1. It is constructed so as to be freely rotatable. That is, the control handle 9 is pivotally connected to the rear end of the machine body frame 1 so as to be rotatable about the horizontal axis, and at each of the two positions described above, it is attached to the bracket 29 that is erected from the machine body frame 1 by the fixing pin 28. It is configured to be fixed in position. The rotation axis of the steering handle 9 is configured to be located on the same axis as the same rotation axis X of each of the relay linking members 22, 24, 27, and it is not necessary to reconnect the operation linking mechanism when changing the control mode. It is configured so that

In addition, a steering rod 30 in the boarding operation section A is continuously provided from the middle of the steering handle 9 toward the front. That is, the control rod 30 is pivotally connected to the middle portion of the control handle 9, and the control rod 30 is pivotally supported by the support link 31 between the middle portion of the control rod 30 and the front side of the body frame 1. 30, the steering handlebar 9, the support link 31, and the body frame 1 constitute a parallel four-link mechanism, and the boarding control rod 30 is provided on both left and right sides of the driver's seat 7 in accordance with a change in the steering form of the steering handlebar 9. The boarding operation position located on the side and the walking control position retracting rearward are interlocked with each other (see FIG. 2).

Further, the steering handle 9 is integrally extended below the rotation fulcrum X, and the left and right steering handles 9 are connected in a loop to form a fall-prevention grounding guide portion 32. As shown in FIG. 4, the grounding guide portion 32 is formed in a loop shape, and when the steering handle 9 is set to the walking steering position, the grounding guiding portion 32 enters the inside of the body, and the foot comes into contact with the operator during walking control, which is an obstacle. When the steering handle 9 is switched to the boarding steering position without protruding, the vehicle frame 1 projects rearward and downward from the rear end, and when traveling on an uneven terrain or when the front wheel 4 rides on a protrusion during rough terrain traveling. When the vehicle body is about to fall backward, the ground contact guide portion 32 comes first and acts to prevent the vehicle body from falling over.

[Other Embodiments] The grounding guide portion 32 may be provided with a grounding idler wheel as shown in FIG. 5, instead of being formed in a loop shape.

It should be noted that reference numerals are added to the claims for facilitating the comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

[Fig. 1] Overall side view of a lawnmower during walking control

[Fig. 2] Side view of the entire lawn mower during boarding operation

FIG. 3 is a plan view showing a walking transmission system.

FIG. 4 is a rear view of the grounding guide portion.

FIG. 5 is a rear view of the grounding guide portion of another embodiment.

[Explanation of symbols]

 1 Airframe Frame 3, 4 Wheels 5 Mower 9 Steering Handle 9a Grip Operating Section 30 Steering Rod 32 Grounding Guide Section A Boarding Operation Section

Claims (3)

[Claims] 1. A boarding operation section (A) is provided above an intermediate portion of front and rear wheels (3) and (4) of a traveling vehicle equipped with a mower (5), and a vehicle body is provided at a rear end of the vehicle body frame (1). A steering handle (9) for walking and manipulating from the rear side is attached, and the steering handle (9) has a grip operating portion (9a) located rearward of the rear end of the body frame (1). Position and fuselage frame (1)
A lawn mower that is configured to be rotatable around a retracted position where it enters the front side of the rear end. 2. A fall prevention grounding guide portion (32) projecting rearward of a rear end of the machine body frame (1) at the storage position below a pivot axis of the steering handle (9). The lawn mower according to claim 1, wherein the mower is extended. 3. The lawn mower according to claim 1, wherein a steering rod (30) in the boarding operation section (A) is connected to the steering handle (9).