JPH0698606A - Lawn mower - Google Patents

Abstract

PURPOSE:To provide a lawn mower ensuring an operator to easily get on and off despite being used properly between walking driving mode and riding one and also enabling the linkage mechanism for its driving to be compactly housed so as not to be in contact with other parts. CONSTITUTION:A riding driving section is provided above an intermediate part of the front and rear wheels on a traveling machine body equipped with a mower, a driving operative section 9a is provided at the idling end of a frame lever 9b revolvably supported around the horizontal shaft core relatively to the machine body frame, and this frame lever 9b is made with a pipe member in an inverse L-shaped manner in the front view of the machine body over the range from riding driving mode with the driving operative section 9a located at the riding driving section to walking driving mode with the driving operative section 9a located above the rear of the machine body, and the driving operative section 9a is linked to a steering operative section provided on the traveling machine body side and a speed change operative section through operative wires 20 and 21 threaded into the frame lever 9b, respectively.

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 above lawnmower, conventionally, a handle for walking and manipulating is composed of a pair of left and right handles, and is arranged at a rear part of the machine body so as to project rearward and upward, and a passenger driving seat is provided at a central part of the machine body. It was configured to be deployed to. The structure as described above, when the lawn mowing work place is flat, by operating in the riding control mode in which the worker is seated on the driver's seat located in the middle of the front and rear wheels in plan view,
When the work area is large, it reduces the work effort such as walking for a long time, and when there are many irregularities and the aircraft is unstable in the riding control mode and it is dangerous, it is possible to perform stable running work in the walking control mode. It has been taken into consideration.

[0003]

However, in the above-described conventional structure, since the walking steering handle is provided so as to project rearward from the rear end of the machine body, a walking worker holding the steering grip in a walking steering mode. There is an advantage that the legs of the robot will not come into contact with the body of the lawn mower and the workability will be excellent, but when working in the riding control mode, when there is an obstacle such as a tree or a wall in the work area, walking Care must be taken so that the steering wheel does not come into contact with the obstacle, and if working without being aware of this, there is a problem that the walking steering wheel and the obstacle collide with each other and cause damage. Also, during walking control, a pair of left and right handlebars is provided so that the left and right handlebars can be reliably gripped and operated by both hands to support and support the aircraft stably. When the handlebar is rotated forward so that it can be used, the handlebars will be located on both the left and right sides of the riding operation section, and the handlebar will be an obstacle when an operator gets on and off the riding operation section. It was easy. Furthermore,
Since the various control levers provided on the handle rod are linked to the steering operation part such as the steering clutch and the transmission of the machine body and the speed change operation part through the linking members such as the operation wire, the rod and the link. However, in the past, since the linking members were provided along the outer periphery of the handle rod, there is a high possibility that the linking member may come into contact with other objects and be damaged, and the handle rod has a walking control mode and a riding style. It was inconvenient to use the rod, the link, etc. in conjunction with the posture switching operation to control the operation, because the operation state had to be readjusted. The present invention has been made in view of the above circumstances, and can be used separately between a walking control mode and a riding control mode, while reducing the risk of the steering handle coming into contact with another object during the riding control, An object of the present invention is to provide a lawn mower that allows a person to easily get on and off the vehicle and can compactly store a control linkage mechanism without contact with other objects.

[0004]

In order to achieve the above object, a lawn mower according to the present invention is provided with a riding operation section above the middle portion of front and rear wheels of a traveling machine body equipped with a mower, and with respect to the machine body frame. The operation control section is provided on the free end side of the frame rod that is rotatably supported around the horizontal axis.
The frame rod is configured to be switchably rotatable between a riding maneuvering form in which the maneuvering operation unit is located in the riding operation unit and a walking maneuvering form in which the maneuvering operation unit is located above the rear of the machine body, and the frame rod is rotatable. Is formed of a pipe member in an inverted L shape when viewed from the front of the machine body, and the steering operation section and the steering operation section and the speed change operation section provided on the side of the traveling machine body are operated by an operation wire passed through the frame rod. The feature is that they are linked. The operation and effect of this characteristic configuration are as follows.

[0005]

Operation: In other words, when walking and manipulating from the rear side of the aircraft,
By setting the steering handle to the walking steering position, the steering operation part is located above the rear of the aircraft, so the legs of the pedestrian do not come into contact with the traveling aircraft during operation and do not hinder walking. It is excellent, and when adopting the riding control form, turning the steering handle to the riding operation position causes the steering handle to enter in front of the rear end of the aircraft frame, so the aircraft was made to turn. In such a case, it is possible to prevent the steering handle from being damaged by coming into contact with an obstacle such as a tree or a wall. Moreover, since the steering wheel is formed in an inverted L shape when viewed from the front of the machine, even in the riding control mode, one side of the driver's seat is in an open state, which facilitates getting on and off. Furthermore, since the frame rod of the steering handle is made of a pipe member, and the steering operation unit of the handle and the traveling machine body are linked to the steering operation unit and the gear shift operation unit through the operation wire through the frame rod, By bending the operation wire, it becomes difficult to change the operation state of the operation system even when the posture is changed due to the switching between the walking control mode and the riding control mode of the handle bar, and the operation wire should not come into contact with other objects. Will be protected by the frame rod.

[0006]

Therefore, when working on uneven terrain with many irregularities, it is possible to work in a stable manner in a walking control mode, and when working on a relatively flat and wide range, use the riding control mode. In the riding control mode, there is no risk of the control handle coming into contact with other objects, and the control handle does not interfere with the getting on and off of the operator while being able to perform work easily without the burden of walking. It is easy to get on and off, and the operation wire for steering and shifting is protected by the frame rod of the steering wheel, and it is possible to reduce the number of parts without the need to fasten the operation wire to the steering wheel. And,
Adjustment of the operation system due to the change in the attitude of the steering wheel has become unnecessary by using the operation wire.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. A lawnmower is shown in FIGS. 1 to 3. In this lawnmower, an engine 2 having a vertically oriented output shaft 2a is mounted on the rear portion of a machine body frame 1 arranged along the longitudinal direction of the machine body, and a pair of left and right drive rear wheels 3, 3 are provided below the engine 2.
3, a pair of left and right caster wheel type front wheels 4 and 4 are disposed below the front end of the body frame 1, and the mower 5 can be vertically adjusted on the lower abdomen of the body between the front and rear wheels 3 and 4. It is attached to. Further, at the front side portion of the engine 2, a passenger driving seat 7 is supported by a supporting member 6 standing upright from the body frame 1, and a passenger driving portion A is provided. The foot pedal 17 for shifting operation, which is projected above the driving step 8, is provided so as to be able to be depressed forward and backward so as to allow a wide front view in the seated state of the driver's seat. Further, a steering handle 9 is extended from the rear portion of the machine body frame 1 toward the upper rear side of the machine body to form a walking control section B capable of performing walking control from the rear side of the machine body.

As shown in FIG. 5, the output shaft 2 of the engine 2
The power is transmitted from a to the pair of left and right hydrostatic continuously variable transmissions H, H via the transmission belt 10, and
A transmission system is configured to supply power from the other transmission belt 11 to the mower 5 via the vertically extending relay shaft 12. Each of the rear wheels 3, 3 is configured to be driven by a hydrostatic continuously variable transmission H, H separately for each of the left and right wheels.
Is configured to be capable of traveling and maneuvering in each of the passenger driving unit A and the walking control unit B. That is, as shown in FIG.
Each of the continuously variable transmissions H, H has a gear shift operation shaft 13, 13 integrally rotatably attached to the gear shift arms 14, 14 as a steering operation unit and a gear shift operation shaft 13, 13 rotatably fitted on the gear shift operation shafts 13, 13. The operation arms 15 and 15 as the gear shifting operation section are linked by springs 16 and 16 so as to be capable of following operation, and each of the operation arms 15 and 15 is operated by the gear shift operating lever 18 provided in the steering operation section 9a of the steering handle 9. They are linked to work together. The operation arms 15 and 15 are configured to integrally rotate via the rod 37 in the speed increasing operation direction from the neutral position of the continuously variable transmissions H and H to the forward side by the operation of the speed change operation lever 18. With the rotation, the spring 1
The speed change arms 14 and 14 follow the rotations via 6 and 16, and the left and right rear wheels 3 and 3 are moved forward at an approximately same speed. Then, the speed change arms 14, 14 are operated by the grip operation of the left and right grip operation levers 19, 19 provided on the steering operation section 9a of the steering handle 9, respectively.
When the grip operation lever 19 is operated when the vehicle is traveling straight ahead in the forward direction by the operation of the gear shift operation lever 18, it is linked so as to be separately rotated in the direction from the neutral position of H to the deceleration side. The gearshift arm 14 on the operated side is operated to the deceleration side against the spring force, and the turning traveling in which the traveling direction is changed becomes possible. Also, when the grip operation levers 19 and 19 are operated with a large grip from the neutral stop state,
It is configured to be operated in a backward traveling state. The gear shift operation lever 18 is structured such that it can hold its position at an arbitrary operation position by interposing a friction holding mechanism by a disc spring 36, which will be described later, during the linkage.

As shown in FIG. 5, the grip operating levers 19 and 19 are linked to the respective shift arms 14 and 14 via the operating wires 20 and 20, and the shift operating lever 18 is also operated via the operating wire 21. Are linked to the respective operation arms 15, 15. These operation wires 20 and 21 are provided through a frame rod 9b formed of a pipe member of the control handle 9.

The steering handle 9 extends between a walking steering position in which the steering operation portion 9a is located rearward of the rear end 1a of the body frame 1 and a retracted position in which the steering operation portion 9a is located in front of the rear end 1a of the body frame 1. It is supported on the machine body frame 1 so as to be rotatable and fixed. That is, the steering operation section 9a is provided on the free end side of the steering handle 9, and the steering operation section 9a is located in the riding operation section A.
The a is constructed so as to be rotatable and switchable to a walking control mode in which it is located at the upper rear of the machine body, and the frame rod 9b of the control handle 9 is formed in an inverted L shape when viewed from the front of the machine body. The operation portion 9a is configured to be rotatable relative to the frame rod 9b about the horizontal axis and adjustable and fixed.

On the lower side of the rear end of the machine body frame 1,
In the riding control mode, a fall prevention tool 23 that prevents the aircraft from tilting at a predetermined angle or more when traveling on an inclined ground to prevent it from falling is supported by the aircraft frame 1 so as to be rotatable around the horizontal axis X2. It has been deployed. The fall prevention tool 23 is interlocked with an operation posture that projects downward toward the rear of the machine body and a storage posture that retracts toward the front inside of the machine body as the frame rod 9b of the steering handle 9 rotates around the horizontal axis X1. It is linked to rotate. That is, as shown in FIGS.
The fall prevention tool 23 is substantially J-shaped when viewed from the front, and a portion projecting downward from the machine body frame 1 is formed in a loop shape, and one side is extended upward from a pivoting pivotal support portion of the frame rod 9b with respect to the machine body frame 1. The upper end portion of the extended support arm portion 23a is slidably engaged with the guide rail 24 fixedly arranged along the frame rod 9b, and is fixed in position at both end portions of the guide rail 24. I am doing it. That is, as shown in FIG. 4, the upper end boss portion 25 of the support arm portion 23 a is fitted into and engaged with the guide rail 24 formed in a U-shaped cross section, and the engaging grooves 26 formed on both left and right sides of the guide rail 24. The stepped shaft member 27 is slidably fitted over the boss portion 25, and the engagement groove 2
The upper and lower end portions 26a of 6 are formed to have a large diameter, and the intermediate portion 26b thereof is formed.
Is formed so that the large diameter portion of the shaft member 27 is fitted and held by the spring 28 at the upper and lower ends 26a of the engagement groove 26, and the operation knob 29 of the shaft member 27 is held by the spring 28.
It is constructed so that it can be operated manually against. Therefore, when the frame rod 9b is in the walking control form, the operation knob 2
9 engages with the upper end portion 26a of the engaging groove 26 to hold the frame rod 9b with respect to the machine body, and when the frame rod 9b is in the riding control mode, the operating knob 29 causes the lower end portion of the engaging groove 26 to move. 26a, the frame rod 9b is held with respect to the machine body, and when the posture of the frame rod 9b is changed, the frame rod 9b is rotated while the operation knob 29 is artificially pulled. When it is dynamically operated, the operation knob 29 is automatically engaged with the end portion 26b of the engagement groove 26 when it takes a predetermined posture, and the frame rod 9b is held in the posture.

Further, as shown in FIGS. 5 to 7, an intermediate linkage structure for linking the foot pedal 17 and the operation arm 15 is provided in the body. That is, the first arm 31 and the foot pedal 1 which are loosely fitted to the pin 30 provided upright on the machine body
7 is linked with a link rod 32, and the second arm 33, which is loosely fitted to the pin 30, is L-shaped in plan view.
The second arm 3 is configured to be pushed in the abutting state by the locking piece 31a of No. 1 and to be pulled.
A second linkage rod 34 is provided so as to interlock the third arm portion 33A and one of the operation arms 15.
A third arm 35 is further loosely fitted to the pin 30, and the second arm 33 is locked by the locking piece 35 a of the third arm 35.
The other arm portion 33B is configured to be rotatable counterclockwise in FIG. Also, the third
An end of an operation wire 21 of the gear shift operation lever 18 is connected to the arm 35. The operation wire 21 is configured to rotate the third arm 35 counterclockwise in FIG. A disc spring 36 for frictionally holding the third arm 35 against the pin 30 is interposed between the head portion at the end of the pin 30 and the third arm 35. In the figure, 38
Is a return spring for urging the second arm 33, the first arm 31, and thus the foot pedal 17 to return to the neutral operation position, and 39 is a stopper for regulating the positions of the second arm 33 and the third arm 35 at the neutral operation position. Is. With the above-described configuration, when the foot pedal 17 is stepped on by the accelerating crocodile in the riding control mode, the first arm 31 moves to the position shown in FIG.
Is rotated counterclockwise in the
The arm 33 is also interlockedly rotated to operate the operation arms 15 and 15 according to the depression amount of the foot pedal 17 to shift the continuously variable transmissions H and H. If you want to run at any speed without operating the foot pedal 17,
The shift operation lever 18 is operated. Although not described in detail, a mechanism for forcibly returning the shift operation lever 18 to the neutral position is also separately provided.

As described above, since the frame rod 9b of the steering handle 9 is formed in an inverted L shape when viewed from the front, even if the riding steering mode is set, one side of the driver's seat 7 is in an open state, An operator can easily get on and off. In addition, the frame rod 9b of the steering handle 9 is formed of a pipe member,
Since the operation wires 20 and 21 are passed through the inside, the operation wires 20 and 21 are protected by the frame rod 9b, and the operation wires 20 and 21 do not have to be fastened along the frame rod 9b.

In the embodiment of the present invention, the speed change arm 14 is used.
Although the steering operation unit and the operation arm 15 are used as the gear shifting operation unit, the steering operation unit may be a member that operates a steering clutch, a steering brake, or the like, and the gear shifting operation unit may be used. The member is not particularly limited as long as it is a member that is interlocked by a gear shift operation. The drive structure of the lawn mower is not limited to the above embodiment, and for example, a structure in which only one transmission is provided instead of a pair may be used.

It should be noted that reference numerals are given in the claims for convenience of 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 is an overall side view showing a lawn mower in a walking control mode.

FIG. 2 is an overall side view showing a lawn mower in a riding control mode.

FIG. 3 is an overall plan view showing a lawn mower.

FIG. 4 is a sectional view showing an unlocked state (a) and a locked state (b) of the structure for fixedly locking the frame rod.

FIG. 5 is a cross-sectional plan view showing a continuously variable transmission, a manipulating operation part, and a structure for linking them.

FIG. 6 is an exploded perspective view showing a relay arm structure that links a foot pedal and the like to a continuously variable transmission.

FIG. 7 is a partially cutaway side view showing a relay arm structure that links a foot pedal and the like to a continuously variable transmission.

[Explanation of symbols]

 1 Airframe Frame 3 Rear Wheel 4 Front Wheel 5 Mower 9a Steering Operation Section 9b Frame Rod 20, 21 Operation Wire A Passenger Driving Section

Claims (1)

[Claims] 1. A riding operation section (A) is provided above an intermediate portion between front and rear wheels (4), (3) of a traveling vehicle equipped with a mower (5), and a horizontal axis core is provided with respect to the vehicle frame (1). A riding operation mode in which a steering operation section (9a) is provided on the free end side of a frame rod (9b) rotatably supported around the steering operation section (9a) located in the riding operation section (A); The manipulating operation part (9a) is configured to be freely rotatable by switching the frame rod (9b) depending on the walking maneuvering form located above the rear of the fuselage.
b) is formed of a pipe member in an inverted L shape in a front view of the machine body, and the steering operation section (9a), the steering operation section and the speed change operation section provided on the side of the traveling machine body are connected to the frame rod ( 9b)
A lawn mower linked by operation wires (20) and (21) passed through the inside.