JPH07329593A - Reverse travel device in cultivator - Google Patents

Abstract

PURPOSE:To improve the safety of reverse travel by providing a control handle elevatingly in a cultivator, and enabling reverse travel by the release of a stopper only when the control handle is lowered, thereby forming such structure that the control handle has to be in the low position. CONSTITUTION:When a speed change lever 9 is moved in the separating direction from a control handle A, a forward gear F is put in, and when the speed change lever 9 is moved onto the A-side, a reverse gear R is put in. At the forward time, the control handle A is set in the range of a high position Hp in relation to a frame 2 so as to obtain the best working state. The speed change lever 9 can be shifted into the forward gear F position but in this state cannot be shifted into the reverse gear R position. At the time of putting in the reverse gear R, the control handle A is set into a low position Lp in relation to the frame 2. The contact of a stopper P with the control handle A is thereby released, and the speed change lever 9 can be moved onto the control handle A side and shifted into the reverse gear R position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a structure in which a back gear cannot be inserted unless the operating handle is set to a low position when the vehicle is traveling backwards, thereby ensuring safe operability during traveling backwards. The present invention relates to a back traveling device for a cultivator.

[0002]

2. Description of the Related Art In a cultivator (equipped with an engine), in order to start the engine and move the cultivator forward, the clutch lever provided on the handshake portion of the operation handle located at the rear of the cultivator is used to engage the clutch. Put in and push the knock provided on the clutch lever, the clutch is fixed,
The tiller is in continuous operation. To disengage the clutch, hold the clutch lever and extend your finger to the knock, and if you operate the knock, the clutch lever is released from the fixed state, and the clutch is released naturally when the clutch lever is released. When such a cultivator is driven to travel backward (backward), the transmission mechanism of the cultivator is set to the reverse travel state and the clutch lever is gripped, the clutch is engaged, and the rotors and drive wheels of the cultivator are Because it rotates in reverse,
The tiller runs backwards.

During this operation, if the clutch lever is released when a danger occurs due to the back travel of the tiller, the clutch is disengaged. Also, with it,
A switch for turning the engine power on (ON) and off (OFF) near the handshake part of the operation handle of the cultivator,
Buttons for turning off the engine are provided at appropriate positions on the operation handle.

In addition, while the tiller is running backwards by power,
When a dangerous state is reached, when the hand (fingers) is extended or the body of a person who is driving a cultivator is touched, the power of the engine is turned off and the engine is stopped. In addition, a lever handle of the back device is provided in a part other than the handshake part of the operation handle of the cultivator, and the lever handle acts on the back device, so that the cultivator starts traveling backward and the speed gradually decreases. There are also things. The danger was dealt with in the operation handle of the tiller.

Further, since the body of the cultivator tilts forward due to the reaction force Q generated when the cultivator travels backward, a sensor has been developed to detect this tilt and the engine is stopped. . And now,
In order to reduce the danger due to the reaction force Q that occurs when the cultivator travels back with power, regardless of whether the current rotary cultivator is large, medium or small, the center of gravity (gravity) should be extremely rearward. It is marketed and used.

There is also a cultivator in which a main clutch is interlocked (disengaged) when a hand clutch provided near the handle grip is engaged (disengaged). In addition, there is a shift clutch which has a gear shift restricting portion for back running to prevent danger of back running. Also,
Furthermore, there is a serious defect that makes it extremely difficult for workers to perform operations in an emergency.

[0007]

When retreating by the power of the tiller, the tiller blade may be rotating immediately before the operator, and if the operator slips or falls over. , Damaging the body with a plowing blade etc.,
It may be pressed against standing trees, stone walls, banks, other obstacles, etc. by a cultivator, and when it is a steep slope at the end of the cultivated land, the valley bottom, etc., it may fall with the cultivator in the valley and may die if it is remarkable. The number of fatal accidents is high. Therefore, although the above-described improvements and developments have been made, in the case of back running, as shown in FIG. 31, the driving wheels may be low in speed, and the reaction force Q is large. , The operation handle of the cultivator is lifted and becomes vertical. When the operator feels physically unstable and dangerous, he / she desperately tries to lower the operation handle and grasps the handshake part. For this reason, it is actually difficult to disengage the clutch and turn off the engine switch, and even today, accidents continue. By emphasizing such accidents, let the sensor detect
Although there is already a wonderful development that stopped it, the cultivator is not flat because there is always vibration, the work site is uneven, and there are also slopes. It is work in such a place, and it is necessary to say that there is a great risk that the sensor will not function when it is essential.

Further, in the case where the center of gravity is extremely rearward in order to reduce the danger due to the reaction force Q generated when the tiller travels backward with power, there is normally no danger when traveling backward. However, it is dangerous if there are ridges, obstacles, etc. at the rear of the vehicle when traveling backward, and usually the center of gravity is extremely rearward, so make sure to lift the operation handle when returning. Since the forward work is performed by the operator, there is a problem that the worker may be tired in one day depending on the case. For this reason, the agricultural industry is demanding a vehicle that has a high degree of safety in backward traveling as soon as possible.

[0009]

Therefore, as a result of earnest studies to solve the above problems, the inventor provided the invention with an operation handle which can be raised and lowered in a cultivator and lowered the operation handle. The back handle of the cultivator allows the vehicle to enter the back drive mode only when the stopper is released, so that the back handle (backward drive) of the cultivator is set to the low position. This is a structure that must be done, and the operability and the safety degree of the back running can be improved, and the above problems are solved.

[0010]

First, as shown in FIG. 2 (a), the speed change lever 9 of the cultivator is moved in a direction away from the operation handle A to enter the forward gear F, and is moved to the operation handle A side to move the back gear. The gear R enters and the middle thereof is neutral N. Then, when the cultivator moves forward, the operation handle A is adjusted so that the working condition of the worker becomes the best.
Is set to a range of high position Hp with respect to frame 2 (see FIG. 3). At this time, the shift lever 9 can be placed in the forward gear F position. However, the operating handle A
Is in the high position Hp, the contact portion 10 of the stopper B comes into contact with the operation handle A even if the shift lever 9 is moved to the back gear R position, the shift lever 9 becomes immovable, and the back gear R does not move. It cannot be placed in the position (see FIG. 2 (b) and FIGS. 4 and 5).

Next, when the speed change lever 9 of the cultivator is put into the back gear R, the operation handle A is set to the low position Lp with respect to the frame 2 (see FIG. 6). Then, with respect to the operation handle A set to the low position Lp, the shift lever 9
Since the stopper B does not come into contact with the operation handle A, the shift lever 9 can be moved to the operation handle A side, and the shift lever 9 can be put in the back gear R position [Fig. 2 (c)]. And FIGS. 7 and 8). That is, when the cultivator is traveling backwards, the operation handle A
Must be set to the low position Lp, and therefore, when the vehicle is running backwards, the operating grip of the operating handle A is not in a high position, so that the worker does not have to stretch his back and maintains a very stable low state. Therefore, the cultivator can be easily controlled at all times, the danger of the worker during back traveling can be prevented, and the safety of the worker can be secured.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the present invention, an engine 1 is mounted on a frame 2 as a cultivator as shown in FIGS. 1 and 2 (a). , The frame 2 is longer than the engine 1,
Other members are also configured such that they can be placed or stored, and project forward in the traveling direction. The drive from the engine 1 is interlocked with a drive shaft 5 located below the frame 2 via a transmission mechanism such as a pulley, a belt or a chain case. In the case of a small cultivator, the drive shaft 5 is provided with a drive wheel 6 when traveling on a road surface, and a cultivating portion (not shown) provided with a plurality of cultivating blades is detachably provided when cultivating. Furthermore, in the case of a large- or medium-sized cultivator (rotary cultivator), the drive wheel 6 and the cultivator section are independent of each other,
There is also an embodiment in which a tiller is provided at the rear of the drive wheel 6.

The operation handle A swings vertically upward and downward from the two frames where the engine 1 is mounted, and is provided so as to be freely fixed at a desired position according to the working conditions of the worker. (See Figure 1, etc.). Then, the operation handle A can be set at the most suitable position. The operation handle A is composed of a boom portion 7 and a handle portion 8, and the swinging operation of the operation handle A described above is performed by the root portion of the boom portion 7. Specifically, the boom portion 7 has a hollow tubular shape, and is formed in a substantially “V” shape when viewed from the side, and is freely swingable in the vertical direction and fixed by tightening through a bearing base 3 provided on the frame 2. Has the structure (see FIG. 1).

A handle portion 8 is mounted from the tip of the boom portion 7, and the handle portion 8 has two handle rods 8a, 8a extending in an "8" shape as shown in FIG. A clutch lever 8b and a grip portion 8c are provided at the tips of the handle rods 8a, 8a. When the clutch lever 8b is grasped [raised upward in FIG. 1 (a)], the drive wheel 6 or the tiller is driven. Further, although the operating handle A is configured with the boom portion 7 and the handle portion 8 as separate materials, the boom portion 7 and the handle portion 8 are not shown as yet another embodiment.
There are also embodiments in which and are integrally formed.

In order to change the angle of the operating handle A to an appropriate angle according to the working conditions of the worker, the bearing base 3 supporting the operating handle A is loosened from the fixed state to the free state. Put the operating handle A into the bearing base 3
The angle is set to a desired angle and fixed.
For fixing the operation handle A to the bearing base 3, a lock photograph or the like provided with a screw for tightening is used. There is also an example in which the bearing base 3 is formed relatively high as shown in FIG.

Further, as another embodiment of the angle adjusting means according to the working condition of the operating handle A, as shown in FIG. 16, an arc-shaped angle adjusting plate 14 is provided between the operating handle A and the frame 2. The angle adjusting plate 14 is provided.
As shown in FIGS. 17A and 18, angle adjusting holes 14a, 14a, ... Are formed in a circular arc direction at predetermined intervals. Further, the positioning pin 15 is urged toward the angle adjusting plate 14 by an elastic body 16 such as a coil spring so as to extend and contract toward the operation handle A side.
The tip of 5 is the angle adjusting hole 14a of the angle adjusting plate 14,
It has a structure to be inserted into 14a, ....

Further, the positioning pin 15 has a wire 17
When the wire 17 is pulled, the tip of the positioning pin 15 is pulled from the angle adjusting holes 14a, 14a ,. The operation handle A can be swung up and down as it comes out. Then, in that state, the operation handle A is set to a desired angle, and the wire 1
When the elastic body 16 is loosened, the positioning pin 15 urged by the elastic body 16 causes the elastic body 16 to adjust the angle adjusting holes 14a, 14a, ...
Then, the operation handle A can be fixed at a desired angle (see FIG. 19). The positioning pin 15 is shown in FIG.
As shown in the phantom line portion of (a), there is an embodiment provided above the operation handle A.

Further, there is an embodiment in which the confirmation projection 18 is provided on the side surface of the angle adjusting plate 14. FIG. 17
17B is a cross-sectional view taken along the line XX in FIG.
As shown in FIG. 17 (b), the confirmation projection 18 is housed in a storage portion 14 b formed in the angle adjusting plate 14, and the elastic body 19 elastically causes the spherical head of the confirmation projection 18 to elastically move. It has a protruding structure. As described above, the confirmation projection 18 is always elastically projected to the outside of the angle adjusting plate body 14, and the confirmation projection 18 is set in the vicinity of the normally used angle of the operation handle A, whereby the confirmation projection 18 is formed. The feeling of elastic contact between the body 18 and the operating handle A can be transmitted to the operator, and the operating handle A can be easily set to the normally used position.

The frame 2 is provided with a speed change lever 9, which is used to move the tiller forward and backward and to change speed and the like. An operator appropriately operates the speed change lever 9. Then, the vehicle can be moved forward, backward, or at a desired speed. Further, in the present invention, the shift lever 9
There are two types of forward, reverse and neutral operation by
One of them is, as shown in FIG. 2A, moving (rotating) the shift lever 9 to the side of the operation handle A to enter the back gear R to travel backward and separate the shift lever 9 from the operation handle A. The forward gear F is moved to move into the forward gear F, and the intermediate position thereof is set to the neutral N.

On the other hand, contrary to the above, the forward gear F is entered by moving the speed change lever 9 to the side of the operating handle A, and the back gear R is moved by separating the speed change lever 9 from the operating handle A. It goes into, and the middle is made into the neutral N. This is shown in the embodiment of Figures 13-15. As shown in FIG. 10, the gear shift lever 9 is provided with a stopper B. When the stopper B is at the high position Hp of the operation handle A, the gear shift lever 9 enters the back gear R by the action of the stopper B. Instead, the shift lever 9 enters the back gear R only when the operating handle A is in the low position Lp. The positions of the back gear R, the neutral N, and the forward gear F of the speed change lever 9 are indicated by the letters R, N, and F in each figure, and the state thereof is specifically shown.

Further, when the gear shift lever 9 is moved (rotated), the base of the gear shift lever 9 does not move its position (see FIGS. 2, 11, 14, 14, etc.) and the gear shift lever 9 Groove sliding type (Fig. 2
9, refer to FIG. 30 and the like). The groove sliding type is specifically provided with a gear shift position confirmation plate 20, and the vicinity of the base of the gear shift lever 9 slides in the gear shift position confirmation groove 20a of the gear shift position confirmation plate 20.

Next, as an example of the stopper B, a type in which the shift lever 9 is moved to the operation handle A side to enter the back gear R position will be described. The stopper B is shown in FIGS. c) and FIG. 10 etc., the contact portion 10 that has a substantially L-shaped cross section and that contacts the boom portion 7 is formed in a substantially vertical shape, and the stopper B
In the state where the contact portion 10 of FIG. 2 is capable of contacting the boom portion 7 of the operation handle A, the gear shift lever 9 cannot move further to the boom portion 7 side (FIGS. 3 and 5).
reference). As a result, as long as the contact portion 10 of the stopper B is in contact with the operation handle A, the speed change lever 9
Cannot move to the side of the operating handle A, so
The shift lever 9 cannot be carelessly put in the back gear R position.

As shown in FIGS. 5 and 10, the stopper B is composed of the abutting portion 10 and the connecting portion 11, and more specifically, the abutting portion 10 with respect to the horizontal connecting portion 11.
Are formed vertically, and FIGS.
As shown in (a), (b), etc., the abutting portion 10 has the connecting portion 1
There is also an example in which it is formed in a hanging shape from 1. Further, one end of the connecting portion 11 is fixed to an appropriate position of the speed change lever 9, and only when the operation handle A is set to the high position Hp, as shown in FIGS.
The abutting portion 10 comes into contact with an appropriate portion of the boom portion 7 of the operation handle A. Further, when the operation handle A is set to the low position Lp, as shown in FIGS. 6 to 8, the contact portion 10 of the stopper B does not contact the boom portion 7, that is, the speed change lever 9 enters the back gear R. Is something that can be done.

The state in which the operating handle A is in the high position Hp means that the operating handle A is set in the high position Hp at the position of the operating handle A at the most suitable angle when the operator normally moves the cultivator forward. The setting range of is relatively wide (see the phantom line in FIG. 1). Further, the state in which the operation handle A is in the low position Lp means that even when the cultivator tilts forward due to the reaction force Q (see FIG. 31) when the cultivator is traveling backwards, the operation handle is operated by the operator. It means the angle at which A can be safely operated and controlled. Specifically,
As shown by the solid line portion in FIG. 1, it is preferable that the grip portion 8c of the operation handle A is at the lowest position. However, the low position Lp state is not necessarily limited to a specific position as described above, and a certain allowable range may exist depending on various conditions such as the height of the worker. The low position Lp state and the high position Hp state of the operating handle A described above are described in the drawings by describing the letters Hp and Lp on the operating handle A, specifically, the high position Hp and low position Lp states. Is shown.

Next, another embodiment of the stopper B is adapted to a type in which the back gear R is inserted by moving the speed change lever 9 in a direction away from the operation handle A. As shown in FIGS. 13 to 15, a bulging bent portion 12 is formed between the connecting portion 11 and the contact portion 10 so as to expand outward. The bulging bent portion 12 surrounds the boom portion 7 of the operation handle A, and the boom portion 7 can be loosely inserted inside. Specifically, the bulging bent portion 12 is inverted L upward from the end of the connecting portion 11.
It may be formed as a V-shaped bulging bent portion, or may be formed in an arc shape. Then, when the speed change lever 9 is put in the back gear R position, the speed change lever 9 is operated so as to be separated from the operation handle A. At this time, the bulging bent portion 12 of the operation handle A in the low position Lp state is operated. As the boom portion 7 is surrounded, the shift lever 9
Can be put in the back gear R [see FIGS. 15 (a) to 15 (c)]. Further, the stopper B is often formed of a metal strip plate as shown in FIG.

In the type in which the speed change lever 9 comes close to the operation handle A side to enter the back gear R position, the speed change lever 9 moves away from the operation handle A side to the back gear R.
In any of the types in which the operation handle A is in the high position Hp, the contact portion 10 of the stopper B contacts the boom portion 7 and the back gear R does not enter, and when the operation handle A is in the low position Lp. The back gear R enters without contacting the contact portion 10 of the stopper B with the boom portion 7. In addition, in FIGS.
6 shows an operating state of the embodiment type shown by 6, and the stopper B is formed by bending a metal rod material appropriately. In the stopper B shown in FIG. 20, a bent portion 13 is formed between the connecting portion 11 and the abutting portion 10, and the operation handle A is housed in the bent portion 13, so that the shift lever 9 can be moved. it can.

The stopper B is attached to the operation handle A.
There is also an example in which it is provided on the boom section 7 of
As shown in FIGS. 23 and 24, the contact portion 10 is the boom portion 7
When the boom portion 7 is at the high position Hp, the gear shift lever 9 is provided on the side surface of the contact portion 10 or below the contact portion 10.
The structure is such that it abuts against and does not enter the position of the back gear R.

Next, as shown in FIG. 21, the stopper B has a downward sloped bent portion 10 below the contact portion 10.
a is formed, and as shown in FIGS. 22A and 22B, when the operating handle A moves from the low position Lp to the high position Hp, the operating handle A comes into contact with the inclined bent portion 10a. In some cases, the speed change lever 9 can be automatically set to the neutral position. That is, by shifting the operating handle A from the low position Lp to the high position Hp, the gear shift lever 9 enters the neutral N position and safety is ensured.

Further, the inclined bent portion 10a is shown in FIG.
It can also be formed on the stopper B of the type shown in FIG. 15, and specifically, as shown in the phantom lines in FIGS. 15 (a) and 15 (b), between the contact portion 10 and the bulging bent portion 12. Has been formed. Further, as shown in FIGS. 29 and 30, a stopper B having an inclined bent portion 10a is provided on the side of the operation handle A so that the operation handle A moves from the low position Lp to the high position H.
There is also an example in which the groove sliding type shift lever 9 is moved from the position of the back gear R to the position of the neutral N when moving to p. At this time, it is possible to confirm the shift state of the shift lever 9 using the shift position confirmation plate 20.

Further, FIGS. 26 to 28 show an embodiment in which a part of the operating handle A is also used as the stopper B, and the stopper B is not provided as a separate material on the operating handle A, but a shift lever. When the operation handle A is in the high position Hp, the contact points 9 are in contact with each other, and when the operation handle A is in the low position Lp, the contact points 9 are in contact with each other, as shown in FIG. 28 (b). Instead, the shift lever 9 can enter the back gear R position. In FIG. 28C, the operation handle A has a substantially elliptical cross-sectional shape.

[0031]

According to the first aspect of the present invention, the cultivator is provided with the operating handle A which can be lifted and lowered, and the stopper B is released to start the backward traveling only when the operating handle A is lowered. By using the back traveling device in the first, firstly, the back traveling (reverse traveling) of the cultivator can be handled in an extremely safe state, and secondly, the worker's concern during the back traveling is concerned. There are various effects such as almost eliminating, cultivating work with peace of mind, and thirdly eliminating work risks in advance.

The above effect will be described in detail. Normally, when the cultivator travels backward, a reaction force Q (see FIG. 31) is generated around the drive wheel 6 provided at the intermediate position of the cultivator. Become. This is considerably large in the case of cultivated land, and the front side of the cultivator is lowered by this reaction force Q, the cultivator is inverted in the direction in which the operation handle A side is raised, and the so-called cultivator is in a state of being put forward. Therefore, the grip of the operation handle A is instantaneously set to an extremely high position, and the worker tries to keep gripping the grip according to his / her judgment. The operation of the cultivator becomes difficult, and the cultivator is likely to be hit by a backward cultivator, which is extremely dangerous.

Thus, the elimination of danger in advance is realized by the present invention. That is, the speed change lever 9 can be put into the back gear R only when the operation handle A is lowered, and therefore, when the cultivator moves backward, the operation handle A is always in the low position Lp, and as described above. Even when the cultivator rotates backward around the drive wheel 6 due to the reaction force Q generated when the cultivator travels backward, the grip of the operation handle A does not become so high that the worker's safety is improved. You can secure enough. As a result, it is possible to substantially eliminate the anxiety or the like of the worker's accident when the cultivator is traveling backward, and the cultivating work can be performed with peace of mind. Further, it goes without saying that the work-related danger can be eliminated in advance.

Next, in claim 2, the stopper B has an abutting portion 10, the stopper B is provided at an appropriate position of the speed change lever 9, and the abutting portion 10 is
By using the back traveling device in the cultivator that is in contact with only the operation handle A in the high position Hp state, the structure can be simplified and the operation can be easily confirmed. That is, since the stopper B operates together with the gear shift lever 9 and the stopper B is in contact with the operation handle A at the high position Hp, the operating state can be easily visually checked, and the operation can be safely performed. .

Next, in claim 3, the stopper B is provided at an appropriate position of the speed change lever 9, and a bulging bent portion 12 is formed on the stopper B, and the bulging bent portion 12 is formed.
Only the operation handle A in the low position Lp is allowed to enter, and the upper end of the bulging bent portion 12 has an abutting portion 10
And the corresponding contact portion 10 is a back traveling device in a cultivator that is in contact with only the operation handle A in the high position Hp state, so that when the shift lever 9 is put into the back gear R, the operation thereof is performed. It is suitable for a type of moving away from the operation handle A, and the structure thereof can be made extremely simple.

Next, in claim 4, the stopper B is formed on the side of the operating handle A, and the speed change lever 9 is in contact with only the stopper B of the operating handle A in the high position Hp state. By using the back traveling device in the above, it is possible to prevent the operation of putting the speed change lever 9 into the back gear R at the high position Hp of the operation handle A, and similarly, the structure thereof can be extremely simple. In addition, the operation handle A can secure a larger mounting area for the stopper B than the shift lever 9, and
There is an advantage that can be easily attached.

Next, according to a fifth aspect, the stopper B is a back traveling device in a cultivator which is formed with an inclined bent portion 10a which is inclined downward from a lower portion of the contact portion 10. While the steering wheel A is traveling backward, the operation steering wheel A at the low position Lp is mistakenly moved to the high position H
Even when moving to p, operational safety can be ensured. That is, while the vehicle is traveling backward, the operation handle A is set to the low position Lp.
Even if the stopper B is accidentally moved to the high position Hp from above, the stopper B has an inclined bent portion 10a formed therein, and the operation handle A pushes up the inclined bent portion 10a without causing substantial resistance. Move and shift lever 9
Is set to the position of neutral N,
The cultivator can ensure the safety of workers without runaway.

Next, according to a sixth aspect of the invention, in the cultivator in which the operating handle A is provided so as to be able to move up and down, and only the operating handle A in the high position Hp state is brought into contact with the speed change lever 9 to make the back operation impossible. The structure of the back traveling device can be extremely simplified. That is, an appropriate portion of the operating handle A is also used as the stopper B, and the gear shift lever 9 is brought into contact with the operating handle A in the high position Hp. An extremely simple structure can be obtained without providing the stopper B as a material.

[Brief description of drawings]

FIG. 1 is a side view of a tiller equipped with the present invention.

FIG. 2 (a) is a plan view of a cultivator equipped with the present invention. (B) and (c) are schematic cross-sectional views of the essential parts showing the operating state of the present invention.

FIG. 3 is a side view of an essential part showing a state in which an operation handle is set to a high position.

FIG. 4 is a plan view of an essential part showing a state where the operation handle is set to a high position.

5 is a sectional view taken along the line TH-TH in FIG.

FIG. 6 is a side view of an essential part showing a state where the operation handle is set to a low position.

FIG. 7 is a plan view of an essential part showing a state where the operation handle is set to a low position.

8 is a sectional view taken along the line TL-TL in FIG.

9 (a) and 9 (b) are schematic cross-sectional views showing a state in which the stopper is released when the operating handle is lowered from the high position to the low position and the shift lever can be put in the position of the back gear R. Figure

FIG. 10 is a perspective view of an essential part of the present invention.

FIG. 11 is a perspective view of a shift lever, a stopper, and a main portion of an operation handle.

FIG. 12 (a) is a side view of the present invention equipped with a stopper of another embodiment, and FIG. 12 (b) is a sectional view of an essential part including the operating state of FIG. 4 (a).

FIG. 13 is a side view of a cultivator having a stopper according to another embodiment different from FIG.

14 is a perspective view of the present invention including the stopper shown in FIG.

15 (a) and 15 (b) show that the stopper is released when the operating handle is lowered from the high position to the low position in the present invention shown in FIG. 13, and the shift lever is put in the position of the back gear R. Cross-sectional schematic diagram showing the state where

FIG. 16 is a side view of a cultivator having an operation handle lifting mechanism different from that of FIG.

17 (a) is a perspective view of a main part showing an elevating mechanism of an operation handle, and FIG. 17 (b) is a cross-sectional view taken along the line XX in FIG. 17 (a).

FIG. 18 is a cross-sectional view of essential parts showing a lifting mechanism for an operating handle.

FIG. 19 is an enlarged sectional view of an essential part showing the lifting mechanism of the operation handle.

20 (a) and (b) show that the stopper is released when the operating handle is lowered from the high position to the low position in the present invention shown in FIG. 16, and the shift lever is put in the position of the back gear R. Cross-sectional schematic diagram showing the state where

FIG. 21 is a perspective view of an essential part of the present invention including a stopper of another embodiment.

22 (a) and (b) are schematic sectional views showing the operating state of the present invention in FIG.

FIG. 23 is a perspective view of an embodiment in which a stopper is provided on the operation handle side.

FIG. 24 is a cross-sectional view of the essential parts of an embodiment in which a stopper is provided on the operation handle side.

FIG. 25 is a side view of an essential part showing another embodiment of the operation handle and the bearing base.

FIG. 26 is a side view of an embodiment in which the operation handle also serves as a stopper.

FIG. 27 is a plan view of an embodiment in which the operation handle also serves as a stopper.

28 (a) and 28 (b) are schematic sectional views showing an operating state of an embodiment in which the operating handle also serves as a stopper. FIG. 28 (c) is a schematic sectional view of an embodiment in which the operating handle has a substantially oval cross section. Figure

FIG. 29 is a perspective view of a main portion of a shift lever and an operation handle provided with a shift position confirmation plate.

FIG. 30 is a conceptual diagram showing a state in which a shift lever having a shift position confirmation plate shifts from a back gear to a neutral state by a stopper.

FIG. 31 is a side view showing a conventional technique.

[Explanation of symbols]

 A ... Operation handle B ... Stopper 9 ... Shift lever 10 ... Abutment part 10a ... Inclined bent part 12 ... Swelled bent part Hp ... High position Lp ... Low position

Claims (6)

[Claims] 1. A back traveling device for a cultivator, wherein an operating handle is provided so as to be able to move up and down in the cultivator, and only when the operating handle is lowered, a backward travel is performed by releasing a stopper. . 2. The stopper according to claim 1, wherein the stopper has an abutment portion, and the stopper is provided at an appropriate position of the gear shift lever, and the abutment portion only contacts the operation handle in a high position. A back traveling device in a cultivator characterized by being in contact with each other. 3. The stopper according to claim 1, wherein the stopper is provided at an appropriate position of the shift lever, and a bulging bent portion is formed on the stopper, and the bulging bent portion has only an operation handle in a low position. A back traveling device for a cultivator, which is capable of entering and has an abutting portion formed at an upper end of the bulging bent portion, and the abutting portion abuts only an operating handle in a high position. 4. The back travel device for a cultivator according to claim 1, wherein the stopper is formed on the side of the operation handle, and the shift lever is in contact with only the stopper of the operation handle in a high position. . 5. The back travel device for a cultivator according to claim 2, wherein the stopper is formed with an inclined bent portion that is inclined downward from a position below the contact portion. 6. A back traveling device for a cultivator, wherein an operation handle is provided so as to be able to move up and down in the cultivator, and a gear shift lever only comes into contact with the operation handle in a high position so that the back operation cannot be performed.