JPH051760A - Walk-type moving agricultural machinery - Google Patents

Abstract

PURPOSE:To change the machine speed freely under the condition that a grip part of a handle is held by providing a speed control part, which can be turned around of a horizontal shaft, in a grip part of a handle. CONSTITUTION:When an operation handle 30 is pushed down so as to turn a walk-type lawn mower 1, a front side of a mower deck 4 is floated for turning around of a grounding point of rear wheels, and a glass housing bag side is pushed down. A grip part 33 is therefore turned counterclockwise. Then, an inner wire 43 is pulled to the rear side to switch a HST-system transmission 23 to a low speed side, and this condition is maintained, while a machine body is turned around of a grounding point of the rear wheels 18. After turning the machine body, the grip part 33 is turned to a high speed forward side again, while the machine body is made to go forward to continue the lawn mowing work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a walking type mobile agricultural machine,
For example, the present invention relates to a speed adjusting mechanism of a walk-behind mobile agricultural machine such as a snow blower, a lawn mower, or a tiller.

[0002]

2. Description of the Related Art In recent years, HST has been applied to walking type mobile agricultural machines.
Some conventional mobile agricultural machines, such as lawn mowers, change the traveling clutch lever and the angle of the trunnion shaft of the HST transmission in the vicinity of the steering wheel. The speed adjusting lever is provided together with the speed adjusting lever, and in particular, the speed adjusting lever has a friction plate attached to the rotation base of the lever so that the lever can be fixed at an arbitrary angle. In addition, instead of such a fixing method using a friction plate, there is also a method in which a lever is locked by being locked in a stepped guide groove.

[0003]

By the way, in such a conventional device, when the speed is adjusted and changed or the clutch is operated, the handle is grasped by one hand and the clutch lever and the speed are grasped by the other hand. It is necessary to grasp the adjustment lever to operate the clutch and control the vehicle speed, and it is troublesome to frequently adjust the speed with one hand during the work, and the number of operation levers increases and the manufacturing cost increases. There was a problem.

[0004]

The present invention has been proposed in view of the above problems, and the following technical means have been taken. That is, the engine 6, the HST transmission 23 and the rule
A walking type mobile agricultural machine equipped with
The grip part 33 of the handle 30 is provided with a speed adjusting part which is rotatable about a horizontal axis and is a walking type mobile agricultural machine.

[0005]

Embodiments of the present invention will now be described based on the embodiments shown in the drawings. First, the structure will be explained as follows.
Is a walk-behind lawn mower. A mower deck 4 accommodating a single cutting blade 2 and a cutting blade 2 drive shaft 3 is provided with a vertical type engine 6 mounted at the center of the upper part thereof. The rotational power is transmitted to the input shaft 10 of the transmission case 9 via the universal joint 8 and the power is transmitted to the rear wheels 18, 18 described later.

The mower deck 4 has a substantially circular shape when viewed from above, and the upper surface of the outer periphery is gradually raised so that the grass discharge passage 1 is formed on the outer periphery on the right side.
1 at the rear end of this discharge passage 11
The two are detachably connected to each other to accommodate the grass cut in the mower deck 4. The transmission case 9 is shown in FIG.
As shown by cutting out the rear part of the mower deck 4,
In the rear space 15 of the mower deck 4, movement and adjustment can be performed over a predetermined range in the vertical direction. Transmission case
Drive propulsion shaft 17 supported laterally from the bottom of the space 9
Rear wheels 18, 18 are attached to both ends of the rear wheel 1.
Forced driving force is transmitted to 8 and 18 to move the aircraft forward. The heights of the rear wheels 18 and 18 are changed and adjusted by cutting height adjusting levers 20 and 20, and the cutting height adjusting levers 20 and 20 are provided in a guide groove (not shown) formed in the mower deck 4 in the middle thereof.
Lock and secure the cable section.

Reference numeral 22 denotes a swing arm attached to the outer surface of the transmission case 9 and is an HST provided in the transmission case 9.
It is fixed to the outer end of the trunnion shaft 24 of the variable speed transmission 23. The trunnion shaft 24 is normally urged by a spring or the like so as to be in a neutral state where the traveling of the aircraft is stopped,
The swing arm 22 is rotated by operating a traveling speed adjusting member, which will be described later, to move the machine body forward.

1 and 2, reference numerals 25 and 25 are front wheels, 26 is a fuel tank, 27 is a hood, and 30 is a steering wheel. The steering handle 30 is the more deck 4
Base portion 30a attached to the rear end portion and base portion 3
The operation part 30b is divided into two parts, that is, the operation part 30b which is polymerized and fixed to the rear part of 0a, and the operation part 30b is formed in a loop shape as a whole.
The rear end is bent upward so that the side surface has a substantially L-shape.

Reference numerals 32 and 32 denote a base portion 30a and an operating portion 30.
It is a tightening knob for connecting with b. Next, in FIG.
The relationship between the HST transmission 23 and the steering wheel 30 will be described based on the exploded perspective view of FIG. As shown in FIG. 3, the operating portion 30b is further divided into right and left portions, and a grip portion 33 made of a foaming material is interposed between them.

The grip portion 33 includes two holding plates 3
5, 35, material part 36, and right and left holding plates 35, 35
It consists of a guide pipe 37, etc. installed between
The part that protrudes from the end surface of
The grip portion 33 is configured to be inserted into the hollow portions 30c, 30c of the zero operating portion 30b so that the grip portion 33 can rotate about the horizontal axis.

The plate 4 is bent in an L-shape at the inner end of the left side pipe of the operating portion 30b and has a notch recess 39.
0 is fixedly provided, and the rear end of the outer wire 42 is fixed to the plate 40 in order to rotate the trunnion shaft 24 of the HST transmission 23. The inner wire 43 inserted through the outer wire 42 has its tip attached to a pin 45 protruding from the left holding plate 35, and a hair pin 46 for retaining is inserted to insert the inner wire 43. Fix it. Reference numeral 48 is a return spring, which is configured to always return the HST transmission 23 to the neutral state.

The operation of the lawnmower 1 having the above-described structure when performing lawn mowing work will be described. First, the engine 6 is rotated to transmit power to the cutting blade drive shaft 3. The operator grips the grip portion 33 and rotates the grip portion 33 in the clockwise direction in FIG. 2 to rotate the trunnion shaft 24 to the forward high speed side to advance the machine body. FIG. 5 shows the working state. Then, the steering wheel 30 is used to turn the aircraft.
6 is pushed down, the front side of the mower deck 4 is lifted up around the ground contact points of the rear wheels 18, 18 as shown in FIG. 6, and the grass back 12 side is pushed down, so that the grip portion 33 moves counterclockwise. It is rotated.

Then, the inner wire 43 is pulled to the rear side, and the HST transmission 23 is switched to the low speed side. While maintaining this state, the body is turned around the ground contact portion of the rear wheels 18, 18. .. After turning the aircraft,
The grip portion 33 is again rotated forward to the high speed side to move forward to continue the lawn mowing work. In this way, the operator can adjust the forward speed without releasing the grip portion 33 at all, so that the operation at the time of work is easy.

Moreover, at the time of turning, since the control of the vehicle speed can be performed at the same time by simply following the conventional operation method of pushing down the grip portion 33 of the steering handle 30, even an inexperienced person can smoothly perform the turning operation. It has characteristics. In particular, the steering handle 30 described in this embodiment
Since the guide pipe 37 is embedded in the grip portion 33 and the left and right pipes are inserted and held in the pipe 37, even a divided steering wheel can secure sufficient strength, which hinders traveling. Never come.

Further, since the operating portion 30b has no seam and the grip portion is made of a foam material, it is not easily affected by vibration and the like, and has a good feel. 7 and 8 illustrate the mounting structure of the two-divided steering handlebar 30 with an improved heavy weight portion. To briefly describe the structure and the manufacturing method thereof, 50 is a pin having a threaded portion, and 51 is a nut insert type knob.
Reference numeral 52 denotes a recess formed when the hole 54 through which the pin 50 is inserted is formed by a press punching process. The knob 51 is formed so that the tip of the knob 51 is closely attached to the arcuate curved surface 55 of the recess 52 formed during this processing. Is rounded and the knob 51 is tightened to integrate the base portion 30a and the operating portion 30b.

With such a close contact structure, the tightening portion of the handle pipe is less likely to loosen, and the flat portion is formed by crushing the round pipe as in the conventional case.
Vibration and looseness are less than those of flat parts tightened with bolts.

[0017]

As described above, according to the present invention, the engine 6 and the H
A walking type mobile agricultural machine including an ST type transmission device 23 and a loop type handle 30. A grip 33 of the handle 30 has a speed adjusting unit rotatable about a horizontal axis. Since it is a walking type mobile agricultural machine characterized by that, it becomes possible to arbitrarily change the vehicle speed while grasping the grip portion 33 of the handle 30 with both hands, and it becomes possible to respond swiftly during the work, and at the same time as the conventional speed. Since the adjusting lever is not required, the structure is simple and the structure can be inexpensively constructed.

[Brief description of drawings]

FIG. 1 is a plan view of a walk-behind lawnmower.

FIG. 2 is a side view of a walk-behind lawnmower.

FIG. 3 is an exploded perspective view of a steering handle.

FIG. 4 is an exploded perspective view of a steering handle.

FIG. 5 is an operation diagram illustrating a state during lawnmower work.

FIG. 6 is an operation diagram illustrating a state of a turning operation.

FIG. 7 is a plan sectional view of a handle portion.

8 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Pedestrian lawn mower 4 Mower deck 6 Engine 9 Transmission case 23 HST type transmission 30 Control handle

Claims (1)

Claims: 1. An engine 6, an HST transmission 23, and a ruler.
A walking type mobile agricultural machine equipped with
The walking type mobile agricultural machine, wherein the grip portion 33 of the handle 30 includes a speed adjusting portion that is rotatable about a horizontal axis.