JPH0595703A - Work machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a working machine in which the steering handle can be commonly used and the structure can be simplified in each of the riding control mode and the walking control mode in a state where the steering operation is easy. [Composition] A driver's seat 8 is provided in the upper middle part between the front wheel 5 and the rear wheel 4, and a pair of left and right steering handles 17 are provided. Operating grips 17a are located on both left and right front sides of the driver's seat 8. And the operation grip portion 17a is configured to be swingable by switching to a walking and steering posture in which the operation grip portion 17a projects to the rear of the machine body. In the above, an attitude holding mechanism 33 is provided which can hold the position of the operating grip portion 17a in a predetermined attitude.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine such as a lawn mower.

[0002]

2. Description of the Related Art Conventionally, in the above working machine, a walking type steering handle and a riding type steering handle are provided even in a working machine which can be operated in either walking control or riding control.
Each had its own steering wheel.

[0003]

However, according to the above-mentioned structure, since the control handle is separately provided for each control section, there are disadvantages that the number of members is increased, the structure is complicated, and the cost is increased. there were. The present invention aims to eliminate the above-mentioned problems.

[0004]

A characteristic configuration of the present invention is that a driver's seat is provided in the upper middle portion between a front wheel and a rear wheel, and a pair of left and right steering handles are provided, and their operation grips are on the front left and right sides of the driver's seat. And the operating grip is configured to be swingable by switching between a walking steering posture in which the operating grip portion projects rearward of the machine body, and the operating grip portion is provided to the handle base so that the posture can be freely changed. In both of the above-mentioned maneuvering postures, a posture holding mechanism capable of holding the position of the operation grip portion in a predetermined posture is provided.

[0005]

[Operation] By changing the posture of the steering handle to the riding posture, the driver can perform the steering operation while sitting on the driver's seat. At this time, the posture of the grip operating portion of the steering handle is changed with respect to the handle base. The posture can be changed to be easy to operate.
In addition, the steering handle can be changed to the walking control posture and the grip operation section can be changed to a posture in which it is easy to operate, so that the walking control can be easily performed.

[0006]

As a result, it is possible to use the steering handle in common in both the riding control mode and the walking control mode, and it is not necessary to separately provide a steering handle for each of the walking control section and the riding control section. , The structure was simplified. Moreover, even if the posture of the grip handle changes along with the change in the posture of the steering handle, the posture with respect to the handle base can be changed. It does not cause a decrease.
Further, in the riding control mode, since the walking control handle does not project toward the rear of the machine body, there is an advantage that there is less risk of contact with an external object during work traveling and the traveling safety is high.

[0007]

Embodiments will be described below with reference to the drawings. Figure 1
Shows a lawnmower, which is an example of a working machine. In this lawnmower, a pair of left and right machine frames 1, 1 are arranged in front of and behind the machine body, and an engine mounting frame 2 is erected over each of the machine frames 1, 1 at the rear portion of the machine body. The engine 3 is mounted and supported on the top. The left and right rear wheels 4 and 4 are provided below the engine 3, the left and right front wheels 5 and 5 are provided at the front end of the body frame 1, and the mower 6 is provided between the front wheel 5 and the rear wheel 4 on the lower abdomen of the body. It is installed. A pair of hydrostatic continuously variable transmissions H and H are arranged in parallel below the engine 3, and the left and right rear wheels 4 and 4 are separately driven by the continuously variable transmissions H and H, respectively. The left and right front wheels 5 and 5 are idler wheels that are freely rotatable around a vertical axis and are caster type. Front-supporting gate-shaped support frame 7 erected from the left and right body frames 1, 1 so as to pass above the engine 3.
The driver's seat 8 is placed and supported on the upper side, and the driver's seat 8 is arranged in the space above the engine 3. A driver section step 9 is provided above the mower 6 on the front side of the driver's seat 8.

The mower 6 is a front and rear L-shaped rocking member 1.
0 and 10 are suspended and supported through the long holes, and the rocking members 10 and 10 are linked to the height adjusting lever 12 through the connecting rod 11. That is, the height adjustment lever 12
Is pivotally supported on the machine body frame 1 so as to be swingable around a horizontal axis X1 and selectively pinned over a plurality of adjustment holes 13 provided at the base end and a pin engaging portion 14 on the machine body frame 1 side. The height of the mower 6 can be adjusted by inserting and engaging 15 with the mower 6.

As shown in FIG. 3, in the height adjusting structure of the mower 6, the operating cylinder portion 40 is fixed to one rocking member 10, and a plurality of locking grooves 41 integrally formed in the machine body frame 1 are used for selecting. Flexible lock pin 42 and operation knob 43 at the tip of the tube 40
And the lock pin 42 are linked through a link mechanism 44, and the lock pin 42 is disengaged and swung by the operation of the operation knob 43, and then the lock pin 42 is selectively engaged with any one of the locking grooves 41. But it's okay.

A fall prevention member 16 is connected across the rear ends of the left and right body frames 1 to prevent the body from falling backward during riding. Also, this fall prevention member 1
6 is detachably provided. During maintenance work such as replacement of the cutting blade of the mower 6, as shown in FIG. 4, the fall prevention member 16 is connected to the end of the mower 6 and also serves as a support member. It is designed to be possible. At this time, the mower 6 and the overturn preventing member 16 are fixed by a pin to prevent rotation.

While the power is transmitted from the vertical output shaft 3a of the engine 3 to the mower 6 through the transmission belt 19, the other transmission belt 20 is applied to the respective input shafts 21 and 21 of the continuously variable transmissions H and H. The transmission system is configured to transmit power. Each of the continuously variable transmissions H, H is configured such that the transmissions H, H are shifted from the neutral state to the forward side by the same amount by operating the speed setting lever 22 and are arranged on the steering wheel 17. The grip operation lever 23,
A gear shift operation system is configured so that the forward speed set by the speed setting lever 22 can be changed to the reverse side by operating 23. More specifically, as shown in FIG. 2, the speed change operation shafts 24, 24 of the continuously variable transmissions H, H
The gear shift operation arms 25, 25 attached to the gripping operation levers 23, 23 are interlockingly connected to each other via operation wires 26. Further, the operation arms 27 and 27 that are relatively rotatable about the same axis as the rotation axis of the speed change operation arms 25 and 25 are pivotally supported, and the operation arms 27 and 27 and the speed change operation arms 25 and 25, respectively.
25 are interlockingly linked with each other via a tension spring 28, and the gear shift operation arms 25, 2 are operated in accordance with the operation of the operation arms 27, 27.
5 is configured to be actuated following. The operation arms 27, 27 are interlockingly connected via a connecting rod 29 so as to be integrally operable, and are also interlockingly connected to the speed setting lever 22 via an operating wire 30. The operating arms 27, 27 have their swinging ranges regulated so that they are swung in an operating region in which the gear shift operating arms 25, 25 are operated to change from the neutral position to the forward side. The mechanism 31 is configured to be able to hold the position at any operation position. Further, the grip operation levers 23, 23 are operated by grasping the pull operation springs 2 for the follow-up operation.
The operation range is set so that the shift operation arms 25, 25 can be operated to the forward deceleration side and further to the reverse side against the spring force of 8.

Therefore, it is possible to set the maximum straight traveling speed to the forward side by the speed setting lever 22 and to decelerate and reverse the respective speeds of the left and right rear wheels 4 and 4 by the left and right grip operation levers 23 and 23, respectively. In this way, the turning operation is possible, and the small turning turn traveling with the middle position of the left and right rear wheels 4, 4 as the turning center can also be performed to reduce the uncut residue when turning.

The pair of left and right steering handles 17, 1
Reference numeral 7 is swingably attached to the machine body frame 1 around the horizontal axis X2 at the base end thereof, and its operation grip portion 17a is provided.
Is configured to be freely switchable between a riding maneuvering position located on the front left and right sides of the driver's seat 8 and a walking maneuvering position in which the operation grip portion 17a projects rearward of the machine body. Further, the operation grip portion 17a is provided so that the posture thereof can be freely changed with respect to the handle base portion 17b, and a posture holding mechanism that can hold the position of the operation grip portion 17a in a predetermined posture in both of the steering postures is provided. That is, the operation grip 17a is pivotally connected to the handle base 17b so as to be relatively swingable, and the posture fixing handle stay is provided between the operation grip 17a and the frame member 32 that is extended from the body frame 1. 33 (an example of a posture holding mechanism) is pivotally connected, and
A lock mechanism R for fixing the position of the steering handle 17 is provided in both the steering postures. Therefore, the operation grip 17a is held at a predetermined position by the handle stay 33 with respect to the fixed steering handle 17. According to this structure, the steering handle 17 can be used in both the walking steering mode and the riding steering mode, and the structure can be simplified.

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 configuration of the accompanying drawings by the entry.

[Brief description of drawings]

[Figure 1] Overall side view of the lawn mower

FIG. 2 is a plan view of the driving part.

FIG. 3 is a side view of a mower lifting mechanism having another configuration.

[Fig. 4] Side view during maintenance work

[Explanation of symbols]

 4 Rear Wheel 5 Front Wheel 8 Driver's Seat 17 Steering Handle 17a Operation Grip 17b Handle Base 33 Posture Holding Mechanism

Claims (1)

[Claims] 1. A driver's seat (8) is provided in an upper middle portion between a front wheel (5) and a rear wheel (4), and a pair of left and right steering handles (1) is provided.
7) is a riding maneuvering posture in which the operating grips (17a) are located on both front left and right sides of the driver's seat (8),
The operation grip portion (17a) is configured to be swingable by switching to a walking and maneuvering posture protruding toward the rear of the machine body, and the operation grip portion (17a) is provided to the handle base portion (17b) so that the posture can be changed. A working machine provided with a posture holding mechanism (33) capable of holding the position of the operation grip portion (17a) in a predetermined posture in both of the steering postures.