JPH0317605Y2 - - Google Patents

Description

[Detailed description of the invention] Conventionally, in walk-behind mobile agricultural machines such as walk-behind rice transplanters, a float that slides on the rice field is attached to the bottom of the machine so that it can rise and fall, and the height of the machine is detected by this float, and the wheels can be moved up and down using this float. It is already known that the height of the aircraft body is automatically maintained at a substantially constant level by switching the valve of the hydraulic system.

However, if a backward movement mechanism is attached to the hydraulic transmission of the known walk-behind rice transplanter, when the gear lever is put in the back in the field and the machine moves backward, the rear part of the machine lifts up due to running reaction force and at the same time the front part descends. As a result, the front part of the float is pushed up and the valve is switched to the up side, causing the aircraft to rise, creating the danger of the operator holding the handle at the rear of the aircraft being lifted up, or the aircraft tipping over. The sex was hot.

In order to eliminate this drawback, it is necessary to set the hydraulic lever to the neutral position before moving the aircraft backwards, and at this time, other levers must also be operated, making it extremely difficult to maneuver the aircraft around. It becomes complicated and if you forget to operate the hydraulic lever, an unexpected accident may occur.

The purpose of this invention is to improve the above-mentioned drawbacks.The present invention connects the hydraulic system that raises and lowers the wheels with the float that slides on the rice field through a connecting member, and adds a reverse mechanism to the traveling transmission. In the attached walk-type mobile agricultural machine, the gear shift lever of the traveling transmission device is interlocked and connected to the linking member so that when the gear shift lever enters the reverse position, the linking member at least prevents the wheels from descending. It is.

The embodiments shown in the drawings will be explained below.
A transmission case 2 and an engine 3 are attached to the front part of the body 1, and a planting part consisting of a handle 4, a seedling stand 5 that reciprocates laterally, a planting rod 6, etc. is provided at the rear part. The front parts of swing chain cases 9, 9, which support wheels 8, 8 at the rear thereof, are attached to shafts 7, 7 which protrude from the transmission case 2 to both sides so as to be tiltable up and down. An arm 10 rising from the front part of the transmission case 9 is connected to a hydraulic cylinder 12 via connecting rods 11, 11 and a seesaw mechanism 11a, and a shifter shaft protruding from the side of the transmission case 2. 13
is connected to a gear shift lever 14 at the bottom of the handle 4 by a connecting rod 14a.

In addition, the rear part of the float 15 that slides on the rice field is pivotally supported on the body 1 through a planting depth adjustment mechanism so that it can tilt up and down, and the front part is connected to the engine frame 16 through a link 17 so that it can be raised and lowered. be.

Further, the front part of the float 15 and the hydraulic valve 18 of the hydraulic system are connected by a linking mechanism, and the linking mechanism connects the front part of the float 15 with a linking rod 19 and the middle part with a pin 20 of the mission case 2. The shaft 2 of the hydraulic valve 18 is connected to the front part of the pivoted arm 21.
2, an isosceles triangular actuating plate 23 having pins a, b, and c at each corner is fixed with the front part as the apex, and the pin a at the apex of the actuating plate 23 and the arm 21 Since the rear pin d is loosely fitted into the long holes at both ends of the connecting plate 24 and tensioned by the spring 25, the float 15 is pushed up by the mud surface and the arm 21
rotates counterclockwise in FIG. 2, and as a result, the actuating plate 23 rotates clockwise, the hydraulic cylinder 12 operates to push out the wheels 8, 8.
When the float 15 descends and pushes up the aircraft 1, and conversely, when the float 15 descends relative to the aircraft 1, the actuating plate 23
rotates counterclockwise and the aircraft 1 descends.

Wheels 8, 8 by sensing operation of the float 15
The hydraulic cylinder 12 can be raised and lowered automatically during the planting work, but the hydraulic cylinder 12 can also be operated manually by operating the travel clutch lever 26 and the planting clutch lever 27 provided at the hand of the handle 4. .

That is, as shown in FIG. 5, a travel clutch lever 26, a hydraulic pressure lowering arm 29, a planting clutch lever 27, and a base of a hydraulic pressure raising arm 30 are rotatably mounted on a support shaft 28 that is integral with the handle 4. An L-shaped bar 31 that is supported and protrudes from the boss portion of the traveling clutch lever 26 comes into contact with the lower surface of the hydraulic pressure lowering arm 29, which is stopped by a stopper 32, at the cut position of the traveling clutch lever 26. In addition, the L-shaped bar 33 protruding from the boss portion of the planting clutch lever 27 comes into contact with the lower surface of the hydraulic pressure raising arm 30 that is locked by the stopper 34 at the cutting position of the planting clutch lever 27, The hydraulic pressure lowering arm 29 is connected to the pin b above the actuating plate 23 by a wire 35, and the hydraulic pressure raising arm 30 is connected to the pin c below the actuating plate 23 by a wire 36. When the machine is tilted from the cut position to the lower position, the bar 31 pushes up the hydraulic lowering arm 29 and pulls the wire 35, the actuating plate 23 rotates counterclockwise, and the machine 1 descends.
When the planting clutch lever 27 is set from the on position to the up position via the off position and the However, in the end, the body 1 can be raised and lowered by manual operation. When the travel clutch lever 26 is set to the lowered position and the planting clutch lever 27 is set to the X position, the pin c engages with the end of the elongated hole and becomes fixed.

Further, the outer stop plate 37 of the wires 35 and 36 on the handle 4 side has one end rotatably supported by a fulcrum shaft 38, and the other end is connected to the speed change lever 14 by a wire 40 with a spring 39 interposed therein. Therefore, when the gear shift lever 14 is set to the reverse position R to move the aircraft 1 backward, the wire 40
rotates the outer stop plate 37 downward, and at that time,
The rear ends of the wires 35 and 36 are hydraulic lowering arms 29
and the hydraulic lifting arm 30 is the stopper 32, 34.
Since the front ends of the wires 35 and 36 simultaneously pull the upper and lower pins b and c of the actuating plate 23, the actuating plate 23 is placed in a neutral position.

Therefore, the back gear of the transmission is engaged and the aircraft 1
When the vehicle moves backward, even if the front part of the vehicle body 1 descends due to running reaction force, the hydraulic valve 18 maintains a neutral state and the hydraulic cylinder 12 does not push the vehicle body 1 upward.

At this time, the upward force of the float 15 is
5, and in this state, if you tilt the running clutch lever 26 at hand to the lower position or operate the planting clutch lever 27 to the upper position,
The wire 35 or 36 is pulled through the hydraulic lowering arm 29 or the hydraulic raising arm 30, which stretches the spring 39 and returns the outer stop plate 37 to its original state, so that the opposite wire 36 or 3
5 is loosened, and the actuating plate 23 rotates to the lowering side or the raising side.

Next, when the gear shift lever 14 is set to the forward position _F1 or the neutral position N, the wire 40 is loosened, and the outer stop plate 37 is thereby received by the stopper 41, and the return spring attached to the front side of the wires 35, 36 is The outer stop plate 37 returns to its original state due to the tensile action of the wires 35 and 43 and is received by the stopper 41.
6 is a hydraulic lowering arm 29 or a hydraulic raising arm 30
It is activated by the operation.

Note that the configuration can be simplified if the manual operation wires 35 and 36 are also used as the neutral lock operation means for the hydraulic valve 18 as in the above-mentioned embodiment, but another operation path may be provided, and , connect the front ends of the wires 35 and 36 to a member that operates in the same way as the actuating plate 23 in the connecting member between the float 15 and the hydraulic valve 18, for example, the pin 2 of the arm 21.
The same objective as in the previous embodiment can be achieved even if the signal is connected to both sides of 0.

The present invention provides a walk-behind mobile agricultural machine in which a hydraulic system for raising and lowering wheels and a float sliding on a rice field are connected via a linking member, and a reverse mechanism is attached to a traveling transmission, as described above. The gear shift lever is interlocked with the linking member so that when the gear shift lever enters the reverse position, the link member at least prevents the wheels from descending, so that when the gear shift lever is moved to the reverse position, the hydraulic system automatically operates in conjunction with the gear shift lever. Even if the wheels are prevented from descending and the front part of the float is lowered by lifting the aircraft by moving backwards, the sensing operation of the float will not be transmitted as a raise signal to the hydraulic system, and the pilot will be lifted up. The aircraft can be moved backwards safely and smoothly without the aircraft becoming upside down.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and
Figure 1 is a side view of the walk-behind rice transplanter, Figure 2 is a side view of the operating mechanism of the hydraulic system, Figure 3 is a plan view of the lever operating section, Figure 4 is a side view of the same, Figure 5 is manual operation. FIG. 6 is a side view of the same. 1... Airframe, 8... Wheels, 12... Hydraulic cylinder, 14... Gear shift lever, 15... Float,
18... Hydraulic valve, 23... Operating plate, 26...
Traveling clutch lever, 27... Planting clutch lever, 35, 36, 40... Wire.

Claims (1)

[Scope of utility model registration request] A walking type mobile agricultural machine in which a hydraulic device for raising and lowering wheels and a float sliding on a rice field are connected via a connecting member, and a traveling transmission is provided with a reverse mechanism, in which a gear shift lever of the traveling transmission is connected to the connecting member. A hydraulic operating device for a walking type mobile agricultural machine, characterized in that the connecting member is interlocked and connected to at least prevent the wheels from lowering when the gear shift lever enters the reverse position.