JPH08295148A - Back running device in cultivator - Google Patents

Abstract

PURPOSE: To improve the safety of driving in a backward running condition, by making it possible to run backward only when the elevating angle of an operation handle is made small, when a back running (a retreating running) is carried out. CONSTITUTION: In a cultivator, the elevating angle of an operating handle A is made regulatable in plural stages. Only when the elevating angle of the operating handle A is made in a small value, a stopper C is released and a backward running can be carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it possible to carry out the back running only when the raising / lowering angle of the operating handle is reduced when carrying out the back running (reverse running), and it is possible to enhance the safety of steering during the back running. The present invention relates to a back traveling device for a cultivator.

[0002]

2. Description of the Related Art In a walk-behind cultivator (equipped with an engine), a clutch lever provided near a handshake portion of an operation handle located at the rear part of the cultivator is used to start the engine and move the cultivator forward. Grip, put the clutch,
When the knock provided on the clutch lever is pushed, the clutch is fixed and 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. Also, the clutch (main clutch and sub clutch) is operated to engage the clutch, and a continuous operation state is set. In this case, in order to disengage the clutch, the clutch release lever provided near the handshake portion of the operation handle is operated with a finger. When such a cultivator is driven backwards by power, the transmission mechanism of the cultivator is set to the backward traveling state, and when the clutch lever is held, the clutch is engaged and the rotors and drive wheels of the cultivator rotate in reverse. , The cultivator 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 generated when the cultivator travels backward, a sensor has been developed to detect this tilt and the engine is stopped. In addition, at present, in order to reduce the danger due to the reaction force generated when the cultivator travels backward with power, regardless of whether the current rotary cultivator is large, medium or small, the center of gravity (gravity) is extremely rearward. It is sold and used as a copy.

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,
In the case of a rotary cultivator, there was also a mechanism that could not run backward unless it was in neutral. Further, there was a serious defect that the operation in case of emergency was extremely difficult to perform.

[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 is pressed against standing trees, stone walls, banks, pillars in the house, other obstacles, etc. by the cultivator, and when it is a steep slope at the end of the cultivated land, this end falls with the cultivator in the valley and is remarkable. In some cases, they may die and many fatal accidents occur. Therefore, although the above-mentioned improvements and developments have been made, in the case of back running, as shown in FIG. 25, the driving wheels may be at low speed, and the reaction force Q is large,
Along with this, a sudden movement of the center of gravity to the front side of the cultivator is also added, and the reaction force Q raises the operating handle of the cultivator to make it 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. There is already a wonderful development that made it possible to stop by sensing with a sensor by focusing on such accidents, but the cultivator always has vibration, and the work site is uneven, In addition, there are some slopes and the work site is not flat. 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 driver performs the driving work in some cases, there is a problem that the worker may be tired and tired in one day. 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 made it possible to adjust the elevation angle of the operating handle in a cultivator in a plurality of steps, In order to carry out the back travel (reverse travel) of the cultivator by using the back travel device of the cultivator, etc., which enables the back travel by releasing the stopper only when the lifting angle of the operation handle is reduced. The structure in which the operation handle has to be set at a low position can improve the operability and the safety degree of the back running, thus solving the above problems.

[0010]

When the operating handle A has a large up-and-down angle in the cultivator, the stopper C contacts the operating handle A and the gear shift lever 20 cannot be converted to the backward travel, so that the up-and-down angle of the operating handle A is reduced. Only at this time, the stopper C is released, and the gear shift lever 20 can be converted to the backward traveling.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment (including modified examples) of the present invention.
9 to FIG. Since the main part of the cultivator has the same configuration as that shown in FIGS. 10 to 16,
This point will be described first. The engine 1 is mounted on a frame 2. The frame 2 is longer than the engine 1, and the engine 1 and other members can be placed or stored therein, and project forward in the traveling direction. The drive from the engine 1 is a pulley, a belt or a chain case 3
It is interlocked with the drive shaft 4 located below the frame 2 via a transmission mechanism such as. In the case of a small cultivator, the drive shaft 4 is provided with a cultivating part 5 provided with a plurality of cultivating blades 5a at the time of culturing, and a drive wheel 6 is detachably provided at the time of traveling on a road surface. Further, in the case of a large-sized or medium-sized cultivator (rotary cultivator shown in FIG. 20), the cultivating part 5 and the drive wheel 6 are independent of each other, and the cultivating part 5 is provided at the rear part of the drive wheel 6.

The operating handle A is a protrusion or casing 7 provided on the frame 2 where the engine 1 is mounted.
It is tilted upward and backward from the location, and it is installed so that the lifting angle can be adjusted in multiple stages. The lifting angle is fixed at a desired position according to the worker's height and work situation (see FIG. 10, etc.). ). Then, the operation handle A can be set to the most suitable position.

The operation handle A is composed of handle shaft portions 8 and 8 (see FIGS. 11 and 12). The base portions of the both handle shaft portions 8 and 8 are formed to have a narrow interval and are substantially parallel to each other when seen in a plan view, and spread toward the tip end side (handshake portion 8a) to form a substantially V-shape. 8 and 8 are fixed by a connecting rod 8b. The swinging motion of the operation handle A is configured such that the tip ends of the bases of the handle shafts 8 are pivotally supported and can be appropriately swung. Specifically, the frame 2
A vertical plane is swingably provided by a pin 10 at an end of an angle adjusting base B provided at a protrusion provided at 7 or at a casing portion.

The flat portion 11 of the angle adjusting base B is fixed to the projection or the casing portion 7 provided on the frame 2, and the bearing portion 11a at one end of the flat portion 11 is
The base ends of the handle shaft portions 8 and 8 are pivotally supported via a pin 10. An arc-shaped angle adjusting plate 12 is provided at the other end of the angle adjusting base B. Specifically, the angle adjusting plate 12 is formed with a plurality of holes H in the vertical direction (four holes, holes H ₁ , H ₂ , H ₃ , and H ₄ from the bottom). It is constructed symmetrically. The number of holes is not limited to four and may be more or less.

Numeral 13 is a positioning pin, which is provided on the handle shaft portion 8 so as to be elastically urged by the coil spring 14 at all times. Specifically, as shown in FIGS. 12 and 13, the bearing portions 8c and 8 inside the handle shaft portions 8 and 8, respectively.
Positioning pins 13 and 13 are respectively inserted in d, and the elastic force of the coil spring 14 projects toward the base side of the handle shaft 8. The coil spring 14 is provided on the positioning pin 13 and has the bearing portion 8d.
Is inserted between the stop pins 13a provided on the positioning pin 13, presses the stop pins 13a, and springs to the base side of the handle shaft 8 on the bearing 8c side.
The tips of the positioning pins 13 and 13 are configured to be engageable with the holes H of the angle adjusting plates 12 and 12, respectively. The rear side of both of the positioning pins 13 and 13 is pivotally supported on both ends of the U-shaped frame 15, and the rear side of the U-shaped frame 15 is connected to a pullable wire 16. The other end is fixed to an appropriate position of an adjusting lever 17 provided on the grip portion 8a of the handle shaft portion 8.

A tube in which the wire 16 is loosely inserted is fixed to the connecting rod 8b. As a result, by grasping the adjusting lever 17, the wire is pulled, and both positioning pins 13 and 13 are pulled through the U-shaped frame 15 against the elastic force of the coil spring 14, and the positioning is performed. By releasing the engagement of the tips of the pins 13 and 13 with the hole H of the angle adjusting plate 12 and setting the tilt angle of the operation handle A to a desired angle in a free state, and releasing the adjusting lever 17 in that state. , The tips of both positioning pins 13, 13 are repulsed by the elastic force of the coil spring 14, and the hole H of the angle adjusting plate 12
Will be engaged with.

A clutch lever 8e is provided at a handshake portion 8a of the handle shaft portion 8. When the clutch lever 8e is gripped (raised upward in FIG. 10), the drive wheel 6 or the tiller 5 is driven.
The clutch lever 8e may be provided on the front side of the handshake portion 8a or on the connecting rod 8b. To change the operation handle A to an appropriate angle according to the work situation of the worker,
For the angle adjustment base B that supports the operation handle A,
The fixed state is loosened to a free state, and the operation handle A is set and fixed at a desired angle with respect to the horizontal reference line of the main body or the casing section 7 here.

A gear shift lever 20 is provided at an appropriate position on the frame 2 or the like. The speed change lever 20 is for performing forward and reverse movements of the cultivator and conversion of speed and the like, and an operator can appropriately operate the speed change lever 20 to move forward and backward or to a desired speed. First, in the first embodiment of the present invention, as shown in FIG.
Are arranged so as to exist between both handle shaft portions 8, 8. The speed change lever 20 is of a groove sliding type and is equipped with a speed change position confirmation plate 26.

The shift position confirmation plate 26 may be arranged outside the two handle shafts 8 (see FIG. 1A), or may be arranged inside (not shown). Not limited to. The speed change lever 20 is provided with a stopper C so that the stopper C comes into contact with the handle shaft portion 8 from the inside in a range excluding the low position of the operation handle A, and the back gear R is not inserted. There is no mechanism.

The stopper C will be described later,
Briefly, the abutment portion 21 forming the stopper C can abut the handle shaft portion 8 of the operation handle A, and particularly the bearing portion 8c. The gear shift lever 20 is prevented from approaching the handle shaft portion 8 any more. That is, when the inclination angle of the handle shaft portion 8 is large, the hole H ₄ of the angle adjusting plate 12
When the positioning pins 13 are engaged with H ₃ and H ₂ , respectively, as shown in FIG. 2, the contact portion 21 of the stopper C is in contact with the handle shaft portion 8 of the operation handle A. Therefore, the shift lever 20 cannot be moved to the back gear R position. Then, only when the position of the operation handle A is at the bottom and the positioning pin 13 is engaged with the hole H ₁ , as shown in FIG. 1 (B) and FIG. Is configured to get over the operation handle A and enter the back gear R.

As a modified example of the first embodiment, as shown in FIG. 4, it does not have a gear shift position confirmation plate 26, but is outside the casing 30 of the gear shift mechanism G provided attached to the chain case 3. It is of a type in which the shift lever 24 protruding to the front is operated by the shift lever 20. The angle adjustment base B is arranged on the casing 30 of the speed change mechanism section G. The flat portion 11 of the angle adjustment base B has a relatively large operation through hole 11b.
Is formed (see FIG. 7), the shift lever 24 penetrates the operation through hole 11b, and the base 20a of the shift lever 20 is fixedly connected to the shift rod 24.

By operating the speed change lever 20, the speed change lever 24 is rotated in an appropriate direction through the base portion 20a, and forward, reverse and neutral operations can be performed by the clutch of the speed change mechanism section G (FIGS. 4 to 4). (See FIG. 6). The speed change lever 20 includes both handle shaft portions 8 and 8 of the operating handle A having the handle shaft portions 8 and 8 having the above-described substantially C-shape.
Between the angle adjusting bases 12 and 12 of the angle adjusting base B, as shown in FIGS. It is movable between.

As described above, the shift lever 24 is provided on the casing 30 of the speed change mechanism section G so as to project to the outside. As shown in FIG. 5, the transmission mechanism section G includes an input shaft 31 provided with a pulley 33 for receiving the power of the engine 1 and an output shaft 32 for receiving a rotational force from the input shaft 31.
Between the input shaft 31 and the output shaft 32, a forward transmission mechanism 34, a reverse transmission mechanism 35, and a clutch mechanism 36 capable of appropriately switching these are provided. In this embodiment, the forward transmission mechanism 34 uses a gear mechanism, and the input shaft 31 has a transmission gear 34a.
Is fixed, and the output shaft 32 is provided with a transmitted gear 34b in a freely rotatable state. Similarly, the reverse transmission mechanism 35 is a chain type transmission mechanism, the transmission sprocket 35a is fixed to the input shaft 31, and the transmission sprocket 35b is fixed to the output shaft 32.
Is provided in a freely rotatable state, and the transmission sprocket 3
A chain 35c is wound around 5a and the transmitted sprocket 35b.

Further, the output shaft 32 is separated at the portion of the transmitted gear 34b and the transmitted sprocket 35b, and both the shafts can be connected and disconnected by the clutch mechanism 36. Specifically, the output shaft 32 is separated into a forward transmission side shaft portion 32a and a reverse transmission side shaft portion 32b, and a spline 32c is formed on either one of them. In this embodiment, the spline 32c is formed on the reverse transmission side shaft portion 32b. The clutch 36a of the clutch mechanism 36 slides on the spline 32c, but the sliding operation is performed by the moving portion 36b. The moving portion 36b is movable by the shift joint portion 36c, and the shift joint portion 36c is connected to the shift rod 24 (see FIGS. 6 and 7).

By operating the gear shift lever 20 from the outside, the gear shift lever 24 is rotated by the gear shift lever 20 to move the gear shift joint portion 36c, and the clutch 36a is connected via the moving portion 36b. Make a disconnection. Specifically, when the shift lever 20 is set to the back gear R position, as shown in FIG.
The a cuts and separates the output shaft 32 into the forward transmission side shaft portion 32a and the reverse transmission side shaft portion 32b, the reverse transmission side mechanism 35 is actuated, and the traveling sprocket 37 is rotated so as to travel backward. Further, when the shift lever 20 is in the forward gear F position, the clutch 36 a causes the forward transmission side shaft portion 3 of the output shaft 32.
2a and the reverse transmission side shaft portion 32b are connected to each other, the forward transmission mechanism 34 is operated, and the traveling sprocket 37 is rotated for forward traveling.

Then, as described above, the handle shaft portion 8
9A is large and the positioning pins 13 are engaged with the holes H ₄ , H ₃ , and H ₂ of the angle adjusting plate 12, respectively, as shown in FIG. The contact portion 21 of the stopper C is in contact with the handle shaft portion 8 of the operation handle A, and the shift lever 20 cannot be moved to the back gear R position. Also in this embodiment, the abutting portion 21 of the stopper C can be brought into contact with the bearing portion 8c of the shift lever 20 in particular. At this time, the shift lever 20 can move to the neutral N position, but does not move to the back gear R position (see FIG. 9 (B)).

Then, only when the positioning pin 13 is engaged with the hole H ₁ with the position of the operating handle A at the lowermost position, as shown in FIG. Is configured to get over the operation handle A and enter the back gear R. 5 and 8B, 9
In (B), the output sprockets 37 are incorporated in the output shafts 32, respectively.
7 drives the drive shaft 4 via a transmission mechanism such as the chain case 3.

Further, in the second embodiment of the present invention, as shown in FIG. 14, the gear shift lever 20 can be operated to move forward, reverse and neutral, so that the gear can be changed by rotating the gear. As shown in FIG. 14, when the projection 25 provided on the speed change rod 24 is in the vertical direction, it is the neutral N, and when it is rotated inward or outward by about 10 degrees in the clockwise direction, it enters the forward gear F. The back gear R is configured to enter when it rotates inward or outward about 10 degrees counterclockwise. The speed change state of the speed change lever 20 will be described. The rotation direction of the speed change lever 24 is opposite to that of the speed change lever 24. In FIG.
The forward gear F enters in the downward leftward state (rotating in the counterclockwise direction by about 10 degrees or more) and the back gear in the upper leftward state (rotating in the clockwise direction by about 10 degrees or more). It goes into R.

Next, as an embodiment of the stopper C, in the type in which the shift lever 20 is rotated to the operation handle A side (clockwise in FIG. 14) to enter the back gear R position, the stopper C is used. As shown in FIG. 15 and the like, the abutting portion 2 that abuts on the base side of the handle shaft portion 8 at a corner portion of the shift lever 20 having a planar L shape.
It is composed of 1 and a connecting portion 22 continuous to this. Specifically, the stopper C is a plate piece [see FIGS. 11, 12, and 16 (A)], or a rod piece [see FIG. 16 (B)]. The contact portion 21 is integrally formed as a tip (upper side) and the connecting portion 22 is formed as a lower side.

With the contact portion 21 of the stopper C being able to contact the handle shaft portion 8 of the operating handle A, the shift lever 20 cannot move further to the handle shaft portion 8 side. (See FIG. 14A). More specifically, when the handle shaft portion 8 has a large inclination angle, the hole portions H ₄ , H of the angle adjusting plate 12 are
_{When the} positioning pin 13 is engaged with each of ₃ and H ₂ , the contact portion 21 of the stopper C is in contact with the handle shaft portion 8 of the operation handle A,
In FIG. 14 (A), it is configured so that it cannot rotate further clockwise, and thus the shift lever 20 cannot be put in the back gear R position.

However, the holes H ₄ , H of the angle adjusting plate 12
_{Even if the} positioning pin 13 is engaged with each of H ₃ and H _{2 and} the contact portion 21 of the stopper C is in contact with the handle shaft portion 8 of the operation handle A, In FIG. 14 (A), counterclockwise rotation is possible, which allows the shift lever 20 to be easily put in the forward gear F position.

The case where the raising / lowering angle of the operation handle A is large means other than the case where the raising / lowering angle is small. Specifically, as shown in FIGS. 11 and 13, the hole H ₄ of the angle adjusting plate 12 is shown. , H ₃ and H ₂ are engaged with the positioning pin 13. In this way, the raising and lowering angle can be changed in order to allow the operator to operate the cultivator at the optimum height position of the operation handle A as the most appropriate angle according to the height and the like when moving the cultivator forward. is there. On the other hand, when the raising / lowering angle of the operation handle A is reduced, specifically, the lowermost hole H of the angle adjusting plate 12 is specifically referred to.
_This is the case where the positioning pin 13 is engaged with ₁ .

At this time, in FIG. 14 (B), clockwise rotation is possible, whereby the gear shift lever 20 can be easily put in the back gear R position. In this case, even when the cultivator tilts forward due to a reaction force when the cultivator is traveling backward, it means an angle at which the worker can operate and control the operation handle A with a high safety factor, Specifically, in FIG. 10, the gradient angle of the operation handle A is reduced to the lowest position, and the handshake portion 8a of the operation handle A is in the lowest position. Although the lower position is only one place in the embodiment, it is not limited to this and may be provided at a plurality of places depending on various conditions such as the height of the worker so that a certain allowable range is possible.

Further, as shown in FIGS. 11, 14 and 16, the contact portion 21 and the connecting portion 22 of the stopper C are continuously formed via the inclined portion 23, so that the back traveling state can be achieved. When the operating handle A is raised, the handle shaft portion 8 is raised, so that FIG.
As shown in FIG. 4 (A), the inclined portion 23 smoothly rotates counterclockwise, and the contact portion 21 surely rotates counterclockwise, thereby shifting to the neutral N state. Yes [see FIG. 14 (A)].

Next, a modification of the second embodiment of the present invention will be described. As shown in FIGS. 17 and 18, the structure of the operating handle A is different, and the other components are the same as those of the second embodiment. Identical to the first type of example. The operation handle A is
A substantially U-shaped handle base frame 9a and a rod-shaped boom part 9b
And a handle portion 9c which is substantially V-shaped in plan view. That is, the structure of the angle adjusting mechanism of the operation handle A is the same as that of the second embodiment with the handle base frame 9a, and the boom part 9b is fixed to the rear part of the handle base frame 9a and the boom part 9b is fixed. A handle portion 9c is provided at the rear end. Further, the angle adjusting plate 12 provided on the angle adjusting base B is configured in only one row so as to surround the handle base frame 9a. In such a modified example of the second embodiment, the same components as those of the second embodiment are designated by the same reference numerals as those of the second embodiment, and the operation is also the same, and the description thereof will be omitted.

Next, the third embodiment of the present invention, as shown in FIGS. 19 and 20, is the operation handle A of the second embodiment.
(See FIG. 12) or the operation handle A (see FIG. 17) of the modified example of the second embodiment is used, and the speed change lever 20 moves the horizontal plane shape (including the inclined portion) to perform conversion.
Specifically, when seen in a plan view, the gear shift lever 20 is separated from the operation handle A to enter the forward gear F, and the gear shift lever 20 is moved to the operation handle A side to enter the back gear R. Neutral N (see FIG. 19). In this case as well, the shift lever 20 is provided with the stopper C, and the positioning pin 1 is set so as to have an inclination angle when the inclination angle of the operation handle A is high.
When 3 is engaged with the holes H ₂ , H ₃ , H ₄ , the abutment portion 21 of the stopper C hits the operation handle A so as not to enter the back gear R, and the positioning pin 13 is inserted into the hole. Only when engaged with the portion H ₁ , the abutting portion 21 of the stopper C rides over the operation handle A and enters the back gear R. The other constituent elements are the same as in the case of the second embodiment, and the description thereof will be omitted. The positions of the back gear R, the neutral N, and the forward gear F are displayed on the plate or the like when the gear is changed in a plane. In this case, generally, it is of a groove sliding type and is provided with a gear shift position confirmation plate 26, and the vicinity of the base of the gear shift lever 20 slides in the gear shift position confirmation groove 26. Further, in FIG. 20, a fixed-side protrusion 18 having a relatively short length is attached to the base side of the operation handle A, and the operation handle A is provided at this end via the angle adjustment base B.

FIG. 21 shows a modification of the third embodiment.
As shown in (A) to (C), the forward gear F includes a first forward gear F ₁ , a second forward gear F ₂ , and a third forward gear F _3.
Is configured as. As the tilt angle when the gradient angle of the operating handle A is high when engaging the positioning pin 13 into the hole H _2, H _3, H ₄ is
Even if the contact portion 21 of the stopper C hits the operation handle A, it can be converted into the first forward gear F ₁ , the second forward gear F ₂ , and the third forward gear F ₃ , but does not enter the back gear R. Is configured. Also in the modification of the third embodiment, the inclined portion 23 is formed between the connecting portion 22 and the contact portion 21, and the neutral state can be obtained by simply raising the operation handle A from the state of entering the back gear R. It will be configured to return to N. This is a so-called automatic return mechanism.

Further, FIGS. 22A to 22C show another modification of the third embodiment, in which the connecting portion 22 and the abutting portion 21 are bent and formed in an angle shape. It is a mechanism in which the operation handle A cannot be raised from the state of entering the back gear R, that is, so-called automatic return is impossible. In this case, after the shift gear 20 is put in the back gear R, the shift lever 20 is operated to return to the neutral N, and then the operation handle A is raised. Other configurations are the same as those of the third embodiment. Since they are the same, description thereof will be omitted.

In the fourth embodiment, as shown in FIG. 23, the stopper C is provided on the handle shaft portion 8 of the operating handle A or the handle base portion 9a. That is, the upper end of the connecting portion 22 of the stopper C is fixed to the side surface of the handle shaft portion 8 or the handle base portion 9a of the operation handle A, and the contact portion 2 is bent downward from the connecting portion 22 in an angle shape.
1 is formed and the positioning pin 13 is provided with the holes H ₂ , so that the inclination angle becomes a value when the inclination angle of the operation handle A is high.
Only when it is engaged with H ₃ and H ₄ [see FIG. 23 (B)], the speed change lever 20 comes into contact with the contact portion 21 and does not enter the back gear R position. For this reason,
When the positioning pin 13 is engaged with the hole H ₁ so that the inclination angle of the operation handle A is lowered [see FIG. 23 (C)], the gear shift lever 20 moves the contact portion 21. It is configured such that it does not come into contact with the back gear R position. The other components are the same as in the case of the second embodiment, and their explanations are omitted. Also in this case, if the inclined portion 23 is provided, a so-called automatic return configuration is possible, and other actions are the same as those in the second embodiment.

Further, as a fifth embodiment, FIG. 24 (A)
As shown in (B), a chrysanthemum seat 19 in the shape of a crown gear is provided at the end of the fixed-side protruding portion 18, and the inclination angle of the operating handle A for each circular pitch angle between the teeth of this gear. Is adjustable through a tightening screw rod.
In this case, the shift lever 20 and the stopper C are configured to move on a horizontal plane as shown in FIG. 22 to shift gears, but the invention is not limited to this, and the rotation as shown in FIG. It may be configured to shift gears. In the fifth embodiment, since the elevation angle of the operating handle A can be adjusted for each angle of the circular pitch between the teeth of the gear,
Finer adjustment is possible as the circle pitch is reduced,
In practice, it is preferable to be adjustable in several stages.

[0041]

According to the first aspect of the invention, the raising / lowering angle of the operating handle A can be adjusted in a plurality of steps in the tiller, and the stopper C is released only when the raising / lowering angle of the operating handle A is reduced. By adopting the back traveling device for the cultivator which is adapted to start traveling, firstly, the safety of the back traveling (reverse traveling) of the cultivator can be extremely enhanced, and secondly, the work at the time of back traveling. Workers' worries, etc. can be virtually eliminated, cultivating work can be done with peace of mind, and thirdly, work risks can be eliminated in advance. Furthermore, in normal operation, the lifting angle can be easily changed in multiple stages. Thus, various effects such as an increase in work efficiency can be achieved.

The above effect will be described in detail. Normally, when the tiller travels backward, the reaction force Q (see FIG. 10) is centered around the drive wheel 6 or the tiller portion 5 provided at the intermediate position of the tiller. Will occur. This is considerably large in the case of cultivated land, and the reaction force Q causes the front side of the cultivator to be the lower side, and the cultivator is inverted in the direction in which the operation handle A side is raised, so that the so-called cultivator can squeeze forward. Therefore, the handshake portion 8a of the operation handle A instantaneously becomes extremely high position, and the worker tries to keep grasping the handshake portion at the discretion of the operator. The condition is forced, and it becomes difficult to operate the cultivator, and it 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, when the operation handle A is lowered, that is, the operation handle A
Only when the tilt angle of the
Can be put in the back gear R, and therefore the operation handle A is always in the low position when the cultivator moves backward, and the reaction force Q is generated when the cultivator moves backward as described above. The tiller has drive wheels 6 or tiller 5.
The handshake portion 8a of the operation handle A even when it is rotated around the location
Is not so high, which can increase the safety of workers. 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 more peace of mind. In addition, it is possible to eliminate in advance the operational danger. in this way,
Since the handshake portion 8a of the operation handle A is not at a high position when traveling backward, the worker can maintain an extremely stable low state without being forced to stretch his back, and it is easy to control the tiller at all times. The greatest advantage is that the danger of the worker during back running can be prevented and the safety of the worker can be extremely enhanced.

Next, in the invention of claim 2, in claim 1, the stopper C has an abutment portion 21, and the stopper C is provided at an appropriate position of the speed change lever 20, and the abutment portion is provided. 21 is a back traveling device in a cultivator that comes into contact only when the lifting angle of the operation handle A is large, so that the structure is simple and the operation can be easily confirmed. That is, the stopper C operates together with the speed change lever 20, and the stopper C
Since the contact is made only when the up-and-down angle of the operation handle A is large, the operating state can be easily visually checked, and the operation safety can be improved.

According to a third aspect of the present invention, in the first aspect, the stopper C has an abutting portion 21, and the stopper C is fixed to the operation handle A side so that the elevation angle of the operation handle A increases. The shift lever 2 only when it is large
Since 0 is the back traveling device in the cultivator which is in contact with the contact portion 21 of the stopper C, when the speed change lever 20 is put into the back gear R, the structure of the operation handle A is not deformed at all. It can be constructed and its structure can be extremely simple.

Next, in a fourth aspect of the present invention, in the first aspect, the stopper C has an abutting portion 21, and the stopper C is provided at an appropriate position of the speed change lever 20, and the stopper C contacts the stopper C. By forming the inclined portion 23 that inclines downward from the lower part of the contact portion 21, and by forming the inclined portion 23 and the connecting portion 22 of the stopper C continuously, the back traveling device in the cultivator, When the operation handle A is moved from the small up angle to the large up angle during back running, the stopper C has an inclined portion 23 formed thereon, and the operation handle A pushes up the inclined portion 23 without substantial resistance. As a result, the speed change lever 20 moves together, and the speed change lever 20 is set to the neutral N position, so that the cultivator does not run out of control and the worker's safety is improved. Rukoto can.

Next, in claim 5, in claim 1,
The operating handle A is composed of two handle shafts 8 and 8. The operation handle A spreads in a substantially V-shape from the base side of both handle shafts 8 and 8 toward the handshake side, and Since the operating range is the back traveling device in the cultivator housed between the two handle shafts 8 and 8, the shift lever 20 moves forward and backward between the two handle shafts 8 and 8 of the operating handle A. It becomes possible to prevent the gear shift lever 20 from sticking out of both handle shaft portions 8 of the operating handle A. Therefore, when the cultivator is used, the gear shift lever 20 does not get caught on other objects, and the safety can be improved.

[Brief description of drawings]

FIG. 1A is a plan view of a main part of a first embodiment of the present invention, and FIG. 1B is a sectional view taken along line NN of FIG.

FIG. 2 is an operation diagram in which the shift lever with a stopper is in a neutral state in the first embodiment of the present invention.

FIG. 3 is an operation diagram showing a back gear state by a shift lever with a stopper in the first embodiment of the present invention.

FIG. 4 is a plan view of a cultivator equipped with a modification of the first embodiment of the present invention.

FIG. 5 is a plan view of a main part of a modification of the first embodiment of the present invention, showing a partial cross section of a transmission mechanism section.

FIG. 6 is a perspective view of an essential part of a modified example of the first embodiment of the present invention.

FIG. 7 is a perspective view of an essential part of a modified example of the first embodiment of the present invention.

FIG. 8A is an operation diagram showing a back gear state by a shift lever with a stopper in a modified example of the first embodiment of the present invention. FIG. 8B is a partial cross-sectional view of the transmission mechanism portion in the operation state of FIG. Plan view

FIG. 9 (A) is an operation diagram in which the shift lever with a stopper is in a neutral state in the modification of the first embodiment of the present invention. Plan view

FIG. 10 is a side view of a tiller equipped with a second embodiment of the present invention.

FIG. 11 is a perspective view of essential parts of a second embodiment of the present invention.

FIG. 12 is a plan view of an essential part of a second embodiment of the present invention.

13 is a sectional view taken along the line P-P in FIG.

FIG. 14 (A) is an operation diagram in which the gear shift lever with a stopper is in a neutral state in the second embodiment of the present invention, and (B) is an action diagram in which a gear shift lever with a stopper is in a back gear state in the second embodiment of the present invention.

FIG. 15 is a perspective view of an angle adjustment base portion of the second embodiment of the present invention.

FIG. 16A is a perspective view of a shift lever with a stopper included in the second embodiment of the present invention. FIG. 16B is a perspective view of a main portion of the shift lever with a stopper included in the second embodiment of the present invention.

FIG. 17A is a plan view of a main part of a modified example of the second embodiment of the present invention, and FIG. 17B is a sectional view of the handle base frame portion of FIG. 17A.

FIG. 18 is a side view of FIG.

FIG. 19 is a plan view of the essential portions of the third embodiment of the present invention.

FIG. 20 is a side view of a tiller equipped with a third embodiment of the present invention.

FIG. 21 (A) is an operation diagram in a state in which the modification of the third embodiment of the present invention does not enter the back gear, and FIG. 21 (B) does not enter the back gear of the modification of the third embodiment of the present invention, but the forward gear (C) is an operation diagram of a modified example of the third embodiment of the present invention when it is in a back gear

22A is a perspective view of a main part of another modification of the third embodiment of the present invention, FIG. 22B is an operation diagram in a state where the gear does not enter the back gear of FIG. 22A, and FIG. Action diagram

FIG. 23 (A) is a perspective view of a main part of the fourth embodiment of the present invention. (B) is an operation diagram in a state where it does not enter the back gear in (A). FIG. 23 (C) is an action diagram in a state in which it enters the back gear.

FIG. 24A is a plan view of an essential part of a fifth embodiment of the present invention, and FIG. 24B is a perspective view of an essential part of a boom part.

FIG. 25 is a side view showing the operating state of the prior art.

[Explanation of symbols]

 A ... Operation handle 8 ... Handle shaft part 8a ... Handshake part C ... Stopper 20 ... Gear shift lever 21 ... Abutment part 22 ... Connection part 23 ... Inclined part

Claims (5)

[Claims] 1. A cultivator is capable of adjusting a raising / lowering angle of an operating handle in a plurality of stages, and only when the raising / lowering angle of the operating handle is reduced, a backward movement is performed by releasing a stopper. Back traveling device for cultivator. 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 speed change lever, and the abutment portion is provided when a vertical angle of the operation handle is large. A back traveling device in a cultivator, which is abutted only on the back cultivator. 3. The stopper according to claim 1, wherein the stopper has an abutment portion, and the stopper is fixed to the operation handle side, and the shift lever is brought into contact with the stopper only when a vertical angle of the operation handle is large. A back traveling device for a cultivator, which is characterized by being brought into contact with a contact portion. 4. The inclined portion according to claim 1, wherein the stopper has an abutting portion, and the stopper is provided at an appropriate position of the gear shift lever and inclines downward from a position below the abutting portion of the stopper. The back traveling device in a cultivator, wherein the inclined portion and the connecting portion of the stopper are continuously formed. 5. The shift handle according to claim 1, wherein the operating handle is composed of two handle shaft portions, and the handle handle portions extend from the base portion side toward the handshake portion side in a substantially V-shape. A back traveling device for a cultivator, characterized in that the operating range of the lever is set within the space between both handle shafts.