JPH0767911B2 - Adjusting device for changing handle height of walking type work machine - Google Patents

Description

Description: (a) Industrial field of use The present invention relates to a handle height change adjusting device for a walk-behind work machine, which is capable of changing the perspective of a work part by utilizing rotational force of an axle. There is something.

(B) Conventional technology Conventionally, this type of walk-type working machine, for example, a cultivator, is provided with a cultivating rotary (working part) on a lower rear frame of a machine frame supported by an axle to which wheels are fixed, and a handle stand above it. A handle was connected to the shaft via a horizontal shaft so as to be vertically rotatable (for example, Japanese Utility Model Publication No. 39-13417).

(C) Problems to be solved by the invention Therefore, in this seed cultivator, the height of the operator who operates the handle before plowing work, the plowing depth, etc. are taken into consideration and the handle height is manually changed and adjusted. However, it is not carried out during the work because it is troublesome and the work efficiency is lowered because the change and adjustment is done manually.

Therefore, the ground height of the steering wheel greatly differs between the time of plowing with the working unit lowered and the time of traveling with the working unit levitated, and the operator's fatigue increases. There was a problem that the shortest horizontal distance between the gripped hand position and the axle approached, the operator approached the working part, and it was difficult to operate the steering wheel, and it was dangerous.

(D) Means for Solving the Problem Therefore, according to the present invention, a working portion is provided on a rear lower frame of a machine frame supported by an axle on which wheels are fixed, and a handle is provided on a handle pedestal above the work portion via a horizontal shaft. In a walk-type working machine that is connected and is capable of vertically rotating the machine body about the axle, a clutch mechanism is provided for performing a connection / disconnection operation between the one axle and a swing arm loosely fitted to the axle. A driven arm, which is linked to a swing arm via a connecting member, is fixed to the base of the handle, which is rotatable up and down about the axis of the horizontal axis, or to this connecting member, and the axle is switched by the connection side switching operation of the clutch mechanism. The handle is rotated up and down by using the rotational force to adjust the handle to the working portion.

(E) Action With the above configuration, when the clutch mechanism is switched to the connection side and the wheels are rotated so that the machine body moves slightly forward, the rotational force of this axle is transmitted to the swing arm via the clutch mechanism. Since the handle is changed downward and adjusted in association with the rotation of the swing arm to approach the working unit, if the ground height of the handle is kept constant, the working machine moves upward. Will be lifted to.

(F) Example Hereinafter, a case where the present invention is applied to a walk-type cultivator will be described with reference to the drawings.

As shown in FIG. 1, a walk-behind field cultivator has an engine 2 at the front of the machine frame 1, a transmission case 3 at the center, and a handle base 4 at the upper rear.
The wheels 6, 6 are fixed to the axles 5, 5 protruding from the lower side walls of the transmission case 3 to the left and right respectively, and the power of the engine 2 is appropriately decelerated in the transmission case 3. , The wheels 6, 6 are transmitted to the axles 5, 5 via the side clutch mechanism 8, 8 linked to the side clutch levers 17, 17.
Are being driven. At the rear lower part of the machine frame 1, a working part 9 including a plowing claw 10 ..., a tail wheel 11 and the like is mounted, and a handle 12 is extended upward from the handle base 4.

By the way, according to the present invention, the axle 5 and the swing arm 13 are connected by switching the connection side of the clutch mechanism 14 that connects and disconnects the one axle 5 and the swing arm 13, and the rotation of the axle 5 is changed. It is configured to be transmitted to the handle 12 via 13 or the like to adjust the perspective change of the handle 12 with respect to the working portion 9.

That is, the clutch mechanism 14 is configured by slidably fitting the pressure plate 15 and the plurality of friction plates 16 to one of the axles 5 only for sliding, and the swinging arm is capable of coming into contact with and separating from the friction plates 16.
The annular base of 13 is rotatably fitted to the axle 5, and the handle 12
The pressing plate 15 is slid to the rocking arm 13 side through a fork 18 which is operated by tilting the clutch lever 7 provided near the grip portion, and the friction plates 16 and the rocking arm 13 are pressed against the thrust bearing 19. The friction plates 16 and the swing arm 13 are clamped to be integrated by a frictional force, and the swing arm 13 is connected to the axle 5. And the clutch mechanism 14
Is housed in an auxiliary case 20 attached to the transmission case 3, and the tip end side of the swing arm 13 is projected from the notch 20a of the auxiliary case 20 so that it can swing within a certain range. ， In addition, Hawk 18 is an auxiliary case that can be operated externally
Installed on 20.

On the other hand, the handle 12 has a base 21 which is the horizontal axis 21 of the handle base 4.
It is rotatably pivoted up and down, and a driven arm 22 hangs down from its base. And this driven arm 22
Is interlockingly connected to the swing arm 13 via a linking member 23 made of a rod or a wire, and a return spring 24 is interposed between the swing arm 13 and a member behind the swing arm 13 and is constantly operated by the return spring 24. , In FIG. 1, it is biased clockwise around the axle 5. Therefore, when one axle 5 and the swing arm 13 are connected by the connection side switching operation of the clutch mechanism 14 and then the axle 5 is rotated forward (forward), the swing arm 13 rotates in the opposite counterclockwise direction. Driven member 23,
It is transmitted to the handle 12 via the driven arm 22, and the handle 12 can be forcedly rotated downward. In order to secure the lower position of the handle 12 at an appropriate position, a stopper 25 for restricting the rotation of the swing arm 13 is provided at an appropriate position (in the embodiment, the front end of the cutout portion 20a of the auxiliary case 20 is this stopper). Has become).

In addition, as shown in FIG. 3, a retaining pin 26 that can be retracted and protruded outwardly by a spring 27 is attached to the handle 12, and the retaining pin 26 is attached to the handle 12 to engage and disengage the lever (not shown). It is possible to immerse it by the gripping operation of the notch holes 28a, 28b ...
An appropriate number of holes are drilled in each of these, and a holding mechanism 29 for the handle 12 is formed of these. In the embodiment, notch holes 28a, 28b
2 are formed at the upper and lower sides, and as shown by the solid line in FIG. 1, when the holding pin 26 is engaged with the upper notch hole 28a, the handle 12 separates upward from the working portion 9, while the handle 12 moves upward. When the holding pin 26 is engaged with the lower notch hole 28a, the handle 12 comes close to the working part 9 as shown by the dotted line.

According to the above, at the time of constant landing and cultivating, the handle 12 is separated upward from the working portion 9 and the holding pin 2 is inserted into the upper notch hole 28a.
The height H ₁ of the handle 12 by engaging 6 is such that the operator's hand can easily apply force. When the machine body is rotated during forward plowing, the holding pin 26 is pulled out from the upper notch hole 28a by the gripping operation of the engaging / disengaging lever, and then the clutch lever 7 is tilted to move the forks 18. When the swing arm 13 is connected to the axle 5 via the clutch mechanism 14, the aircraft is slightly advanced in this connected state, and when the swing arm 13 is rotated together with the axle 5 to the stopper 25 position, The handle 12 rotates downwards in conjunction with the rotation of the swing arm 13 and the holding pin 26 is positioned at the lower notch hole 28.
Since it matches the position b, the handle 12 is fixed by returning the engaging / disengaging lever to its original position and engaging the holding pin 26 with the lower notch hole 28a in this matched state. At this time, if the ground height H ₂ of the handlebar 12 is kept at a height where it is easy to put force into the hand, as in the case of plowing, the working unit 9 rotates upward about the axles 5, 5. Approaching the steering wheel 12 and levitating from the ground. Then, the working unit 9 is maintained in a floating state to rotate the machine body. To this end, the interlocking between the axles 5, 5 and the handle 12 is returned by returning the clutch lever 7 to the original position and the clutch mechanism 14 is operated. It is switched to the cutting side and released by freeing the swinging arm 13 (thus, when the linking member 23 is made of a wire, only the swinging arm 13 is returned by the return spring 24. In the case of a rod, since the swing arm 13, the rod and the driven arm 22 constitute a truss, the holding pin 26 is attached to the lower notch hole 28.
When removed from b, the swing arm 13 returns to its original position by the return spring 24, and at the same time, the handle 12 also rotates upward via this rod and the driven arm 22), or either one of the left and right sides. The side clutch levers 17 and 17 can be operated to easily carry out circular work. Next, after the traveling work is completed, the handle 12 is lowered until the working portion 9 comes into contact with the ground, and the engaging / disengaging lever is grasped to pull out the holding pin 26 from the lower notch hole 28b. When the holding pin 26 is rotated upward about 21 to match the holding pin 26 with the upper notch hole 28a and the engaging lever is returned to the original position to engage the holding pin 26 with the upper notch hole 28a, the handle 12 is returned to the original position. You will be able to return and continue cultivating again.

(G) Effect of the Invention As described above, according to the present invention, since the perspective change adjustment of the handle 12 with respect to the working portion 9 can be performed by utilizing the rotation of the axle 5, this change adjustment can be easily performed without labor. Further, when the above-mentioned ground heights H ₁ and H ₂ of the handle 12 during each work are maintained at a height where the operator's hand can easily apply force, and the above-described change adjustment is performed, the working unit 9 comes into contact with the ground. It will be possible to switch between the standing state and the floating state. As in the conventional case, the ground height of the handle 12 is greatly changed and the working unit 9 is grounded each time the plowing work is switched to the traveling work. There is no need to switch between the tilling posture and the floating posture, and each work can be performed easily, and fatigue is reduced. Moreover, the horizontal minimum distance L from the axle 5 to the steering wheel 12 is L.
However, compared to the conventional type, it takes longer to travel, so the lever ratio is advantageous, and the turning operation is easier. In addition, this makes it possible to secure a sufficient distance between the handle 12 and the working unit 9 when traveling around, even in wetlands where the footing is poor, and is advantageous in terms of handling and safety. In this case, if the distance between the handle 12 and the working unit 9 is made the same as in the conventional case, the overall length of the machine can be shortened and the size can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a walk-behind cultivator embodying the present invention, FIG. 2 is a sectional view around a clutch mechanism, and FIG. 3 is a sectional view of a handle holding mechanism. (Code) 4 …… Handle base 5 …… Axle 6 …… Wheels 9 …… Working part 12 …… Handle 13 …… Swinging arm 14 …… Clutch mechanism 21 …… Horizontal shaft 22 …… Driven arm 23 …… Linking Element

Claims (1)

[Claims] 1. An axle (5) having wheels (6) (6) fixed thereto.
The working section (9) is provided on the rear lower frame of the machine frame (1) supported by (5), and the horizontal axis (2
The handlebar (12) is connected via 1), and the axle (5)
In a walk-behind work machine in which the machine body can be rotated up and down around (5), to make a disconnection operation between the one axle (5) and the swing arm (13) loosely fitted to the axle (5). The clutch handle (14) is provided, and the driven arm (22) linked to the swing arm (13) via the connecting member (23) is rotatable up and down about the axis of the horizontal axis (21). (12)
The handle (12) is pivoted up and down by using the rotational force of the axle (5) by switching the clutch mechanism (14) on the connecting side, and the working part ( 9) A handle height change adjusting device for a walk-behind work machine, which is configured to adjust the handle (12) for perspective change with respect to 9).