JP3017478U - Back traveling device in cultivator - Google Patents

Abstract

(57) [Summary] [Purpose] When performing back travel (reverse travel), only when the vertical angle of the operating handle is reduced, the back travel is possible, and the safety of the maneuver during back travel is improved. [Structure] The raising / lowering angle of the operating handle A of the cultivator can be adjusted in multiple stages. Only when the lifting angle of the operating handle A is reduced, the stopper C is released to allow the vehicle to run backward.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention makes it possible to carry out back travel only when the vertical angle of the operating handle is reduced when carrying out back travel (reverse travel), and it is possible to increase the safety of maneuvering during back travel. Regarding the device.

[0002]

[Prior art]

 In a walk-behind cultivator (equipped with an engine), in order to start the engine and move the cultivator forward, the clutch lever provided near the handshake of the operation handle located at the rear of the cultivator is used to operate the clutch. Turn on and push the knock on the clutch lever to lock the clutch and put the tiller in continuous operation. To disengage the clutch, extend the finger to the knock while grasping the clutch lever and operate the knock to unlock the clutch lever, and release the clutch lever to automatically disengage the clutch. In addition, the clutch (main clutch and sub clutch) is operated to engage the clutch, and a continuous operation state is set. In this case, to disengage the clutch, operate the clutch release lever provided near the handshake part of the operating handle with your finger. When driving such a tiller back with power, the transmission mechanism of the tiller is set to the backward travel state, and when the clutch lever is squeezed, the clutch is engaged, and the rotors and drive wheels of the tiller rotate in reverse. , The cultivator runs backwards.

[0003] During this work, if a danger occurs due to the back travel of the tiller, the clutch is released when the clutch lever is released. At the same time, turn off the engine at a position near the handshake part of the operating handle of the tiller, a switch for turning the engine on and off, and at a position appropriately located on the operating handle. There are buttons for it.

Further, when the cultivator is in a back-running state with power, and when a dangerous state is reached, the hand (fingers) is extended or the person who is driving the cultivator comes into contact with the body of the engine. The power is cut 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 operating handle of the cultivator, and the lever handle acts on the back device, and the cultivator begins to run backwards and the speed gradually decreases. There are also such things. The danger was not dealt with in the operating 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 to stop the engine. 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 backward. It is marketed and used as part.

Further, there is 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 one that prevents the danger of back running by providing a shift restricting part for back running on the operation part of the shift clutch. Also, in the case of a rotary cultivator, there was a mechanism in which it could not run backward unless it was neutral. Furthermore, there was a serious flaw that made the operation extremely difficult to perform in an emergency.

[0007]

[Problems to be solved by the device]

 When retreating due to the power of the tiller, the tiller blade may be rotating immediately in front of the operator.If the operator slips or falls, the operator should shred the body with the tiller blade or the like. It was damaged by the cultivator and pressed against standing trees, stone walls, banks, pillars in the house, and other obstacles by the cultivator. In addition, steep slopes at the end of the cultivated land, and when working at this end, cultivated in the valley. It may fall with the aircraft, and in extreme cases, it 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 low in speed, and the reaction force Q is large. A sudden movement of the center of gravity is added to the front side of the machine, and the reaction force Q lifts the operating handle of the tiller to make it vertical. When the worker is physically unstable and feels 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 are constant. There is already a wonderful development that made it possible to stop by detecting with a sensor by focusing on such an accident, but the cultivator always has no vibration and the work site is uneven. The work site is not flat, as some areas are sloped. It is a work in such a place, and it is essential to say that there is a great risk that the sensor will not function when it is essential.

[0008] Further, in order to reduce the danger due to the reaction force Q generated when the tiller travels backwards by power, the one having the center of gravity extremely rearward is dangerous when traveling backwards normally. However, it is dangerous if there are ridges or obstacles at the rear of the car while traveling backwards.In addition, the center of gravity is usually extremely rearward. Since the operator carries out the driving work by lifting it up, there is a problem that the worker is tired and 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 back running as soon as possible.

[0009]

[Means for Solving the Problems]

 Therefore, the inventor, after diligently researching to solve the above-mentioned problems, found that the invention made it possible to adjust the raising and lowering angle of the operating handle in the cultivator in multiple stages, and to reduce the raising and lowering angle of the operating handle. Only by using the back traveling device of the cultivator that allows the driver to enter the back traveling mode by releasing the stopper, in order to carry out the back traveling (reverse traveling) of the cultivating device, set the operation handle to the low position. This is a structure that must be avoided, and the operability and safety of back running can be improved, and the above problems are solved.

[0010]

In the cultivator, when the raising / lowering angle of the operating handle A is large, the stopper C comes into contact with the operating handle A, the gear shift lever 20 cannot be converted to the backward traveling, and the raising / lowering angle of the operating handle A is reduced. Only when this is done, the stopper C is released, and the speed change lever 20 can be converted to reverse running.

[0011]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. A first embodiment (including modifications) of the present invention will be described with reference to FIGS. The main part of the cultivator has the same configuration as that shown in FIGS. 10 to 16, and 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 mounted or housed on the frame 2 and protrudes forward in the traveling direction. The drive from the engine 1 is interlocked with a drive shaft 4 located below the frame 2 via a transmission mechanism such as a pulley, a belt or a chain case 3. In the case of a small cultivator, the drive shaft 4 is provided with a cultivating part 5 having a plurality of cultivating blades 5a at the time of cultivating, and a drive wheel 6 detachably attached at the time of traveling on a road surface. Furthermore, in the case of a large 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. ing.

The operation handle A is tilted upward and rearward from a protrusion provided on the frame 2 where the engine 1 is mounted or from seven casing portions, and is provided so that the elevation angle can be adjusted in multiple steps. It is provided so that it can be fixed at any desired position according to the worker's height and work conditions (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 in parallel with each other with a narrow space when viewed in a plan view, and spread toward the tip end side (handshake portion 8a) to form a substantially H-shape. The parts 8 and 8 are fixed by a connecting rod 8b. The swinging motion of the operating 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, a vertical plane is swingably provided by a pin 10 at an end of an angle adjusting base B provided at a protrusion provided on the frame 2 or at a casing portion at seven locations.

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 handle shaft portion is attached to the bearing portion 11 a at one end of the flat portion 11. The base ends of 8, 8 are pivotally supported via pins 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 provided with a plurality of holes H in the vertical direction (four 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.

Reference numeral 13 is a positioning pin, which is provided on the handle shaft portion 8 so as to be constantly repulsed by the coil spring 14. Specifically, as shown in FIGS. 12 and 13, the positioning pins 133 and 13 are inserted into the bearings 8c and 8d inside the handle shafts 8 and 8, respectively, and the elastic force of the coil spring 14 is increased. Is configured to project to the base side of the handle shaft 8. The coil spring 14 is inserted between the bearing portion 8d and the stop pin 13a provided on the positioning pin 13 on the positioning pin 13, presses the stop pin 13a, and the handle on the bearing portion 8c side. It is designed to spring toward the base side of the shaft portion 8. The respective tip ends of both positioning pins 13 and 13 are configured to be engageable with the holes H of the angle adjusting plates 12 and 12. The rear side of each 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. Release the engagement of the tips of the positioning pins 13 and 13 with the hole H of the angle adjusting plate 12 to set the tilt angle of the operation handle A to a desired angle in a free state, and then release the adjusting lever 17 in that state. Then, the elastic force of the coil spring 14 causes the tips of the positioning pins 13, 13 to engage with the holes H of the angle adjusting plate 12.

A clutch lever 8e is provided at the handshake portion 8a of the handle shaft portion 8. When the clutch lever 8e is grasped (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. In order to change the angle of the operation handle A to an appropriate angle according to the work situation of the operator, the fixed state is loosened to the free state with respect to the angle adjustment base B supporting the operation handle A, and the operation is performed here. The handle A is set and fixed at a desired angle with respect to the horizontal reference line of the main body or the casing portion 7.

A gear shift lever 20 is provided at an appropriate location such as the frame 2. 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. 1, the speed change lever 20 is arranged so as to be present between the handle shaft portions 8 and 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 space between the handle shaft portions 8 (see FIG. 1A), or may be arranged inside (not shown). Not limited to this. 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 It is a mechanism that does not enter.

The stopper C will be described later, but in brief, the contact portion 21 forming the stopper C can be brought into contact with the handle shaft portion 8 of the operation handle A, and particularly can be brought into contact with the bearing portion 8c. It was done. Further, the shift lever 20 is prevented from approaching the handle shaft portion 8 any more. That is, when the steering shaft 8 has a large inclination angle 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. As shown, 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 put in the back gear R position. Then, only when the positioning pin 13 is engaged with the hole H ₁ with the position of the operation handle A at the lowermost position, 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 modification of the first embodiment, as shown in FIG. 4, the casing of the speed change mechanism unit G provided to the chain case 3 instead of having the speed change position confirmation plate 26 is provided. It is of a type in which a shift lever 24 projecting outside from 30 is operated by a shift lever 20. The angle adjusting base B is arranged on the casing 30 of the speed change mechanism section G. A relatively large operation through hole 11b is formed in the flat portion 11 of the angle adjusting base B (see FIG. 7), and the speed change lever 24 penetrates through the operation through hole 11b. The base portion 20a of the shift lever 20 is fixedly connected to the rod 24.

By operating the shift lever 20, the shift lever 24 is rotated in an appropriate direction through the base portion 20a, and forward, reverse, neutral and other operations can be performed by the clutch of the shift mechanism G (FIG. 4). Through FIG. 6). The speed change lever 20 is arranged so as to be operable between both handle shaft portions 8 and 8 of the operating handle A having the handle shaft portions 8 and 8 having the above-mentioned substantially C-shape, and more specifically, As shown in FIGS. 6 and 7, the shift lever 20 is movable between the angle adjusting plates 12, 12 of the angle adjusting base B on the base 20a side.

As described above, the transmission rod 24 is provided on the casing 30 of the transmission mechanism G so as to project to the outside. As shown in FIG. 5, the speed change mechanism section G is composed of 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 rotating force from the input shaft 31. Between the input shaft 31 and the output shaft 32, there are provided a forward transmission mechanism 34, a reverse transmission mechanism 35, and a clutch mechanism 36 capable of appropriately switching these. In this embodiment, the forward transmission mechanism 34 uses a gear mechanism, and the transmission gear 34a is fixed to the input shaft 31, and the transmission gear 34b is freely rotatable on the output shaft 32. Are provided in each. 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 freely rotatable on the output shaft 32. A chain 35c is wound around the transmission sprocket 35a 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 shafts are structured so that they 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, and 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 speed change rod 24 (see FIGS. 6 and 7).

Then, by operating the shift lever 20 from the outside, the shift lever 24 is rotated by the shift lever 20 to move the shift joint portion 36c, and the clutch 36a is moved via the moving portion 36b. To connect and disconnect. Specifically, when the speed change lever 20 is set to the back gear R position, the clutch 36a causes the output shaft 32 to move to the forward transmission side shaft portion 32a and the reverse transmission side shaft portion 32b, as shown in FIG. 8B. After cutting and separating, the reverse transmission mechanism 35 is activated 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 36a connects the forward transmission side shaft portion 32a and the reverse transmission side shaft portion 32b of the output shaft 32 to operate the forward transmission mechanism 34 to drive the traveling sprocket. Rotate 37 to move forward.

Then, as described above, when the inclination angle of the handle shaft portion 8 is large, the positioning pin 13 is engaged with each of the hole portions H ₄ , H ₃ , and H ₂ of the angle adjusting plate 12. 9A, the contact portion 21 of the stopper C is in contact with the handle shaft portion 8 of the operation handle A, and the gear shift lever 20 is put in the back gear R position. It is a structure that cannot be done. Also in this embodiment, the contact portion 21 of the stopper C can be brought into contact with the bearing portion 8c of the speed change 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 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. Reference numeral 1 is configured to ride over the operation handle A and enter the back gear R. In FIGS. 5, 8B, and 9B, a traveling sprocket 37 is incorporated in each output shaft 32, and the traveling sprocket 37 is connected to the drive shaft via a transmission mechanism such as the chain case 3. 4 is driven.

In addition, in the second embodiment of the present invention, as shown in FIG. 14, the gear shift lever 20 can be used to perform forward, reverse and neutral operations, but 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 neutral N, and when it is rotated inward or outward by about 10 degrees clockwise, it enters the forward gear F, The back gear R is configured so that it rotates in the counterclockwise direction about 10 degrees inward and outward. 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 20. In FIG. 14, the horizontal state is the neutral N and the lower left direction. If it is (rotation in the counterclockwise direction by about 10 degrees or more) enters the forward gear F, and if it is in the upper left direction (rotation in the clockwise direction by about 10 degrees or more) enters the back gear R. It is a thing.

Next, as an example of the stopper C, in the type in which the gear shift lever 20 is rotated to the operation handle A side (clockwise rotation in FIG. 14) to enter the back gear R position, the stopper C is As shown in FIG. 15 and the like, an abutting portion 21 abutting against the base side of the handle shaft portion 8 and a connecting portion 22 continuous to the abutting portion 21 are provided at corner portions of the shift lever 20 having a planar L shape. It consists of and. Specifically, the stopper C is a plate piece [see FIGS. 11, 12, and 16 (A)], or a bar 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.

In the state where the contact portion 21 of the stopper C is capable of contacting the handle shaft portion 8 of the operation handle A, the gear shift lever 20 is prevented from moving toward the handle shaft portion 8 further. [See FIG. 14 (A)]. More specifically, when the handle shaft 8 has a large inclination angle, the hole H of the angle adjusting plate 12 is_Four , H ₃ , H₂ When the positioning pin 13 is engaged with each of these, the contact portion 21 of the stopper C is in contact with the handle shaft portion 8 of the operation handle A, as shown in FIG. Further, it is configured so that it cannot rotate any further in the clockwise direction, so that the shift lever 20 cannot be put in the back gear R position.

However, in the case where the positioning pin 13 is engaged with each of the holes H ₄ , H ₃ , and H ₂ of the angle adjusting plate 12, the abutting portion 21 of the stopper C is operated by the operation handle A. 14 (A), it is possible to rotate the gearshift lever 20 in the forward gear F position easily even if it is in contact with the handle shaft portion 8 of FIG. It is configured to be able to.

Further, the case where the raising / lowering angle of the operation handle A is large means the case where the raising / lowering angle is small. Specifically, as shown in FIGS. 11 and 13, the hole H of the angle adjusting plate 12 is used. _This is the case where the positioning pin 13 is engaged with each of ₄ , H ₃ , and H ₂ . In this way, the raising and lowering angle can be changed so that when the worker moves the cultivator forward, it is operated at the optimum height position of the operation handle A as the most appropriate angle according to the height and the like. is there. On the other hand, when the raising / lowering angle of the operation handle A is reduced, specifically, the positioning pin 13 is engaged with the lowermost hole H ₁ of the angle adjusting plate 12.

At this time, in FIG. 14 (B), clockwise rotation is possible, which allows the shift lever 20 to be easily put in the back gear R position. In this case, when the cultivator is traveling backwards, even if the cultivator leans forward due to the reaction force, it means the angle at which the operator can control the operation handle A with a high safety factor. Specifically, in FIG. 10, the inclination 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 position in the embodiment, the lower position is not limited to this and may be set at a plurality of positions 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. In this state, when the operating handle A is raised, the handle shaft portion 8 is raised so that the inclined portion 23 smoothly moves counterclockwise as shown in FIGS. 14 (B) to 14 (A). As a result, the contact portion 21 is surely rotated counterclockwise so that the gear can be shifted to the neutral N state [see FIG. 14 (A)].

Next, a modified example of the second embodiment of the present invention will be described. As shown in FIGS. 17 and 18, the structure of the operation handle A is different, and other components are the same as those of the second embodiment. Identical to the first type of example. The operation handle A includes a substantially U-shaped handle base frame 9a, a rod-shaped boom portion 9b, and a substantially V-shaped handle portion 9c 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. A handle portion 9c is provided at the rear end of 9b. Moreover, 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 the 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, in the third embodiment of the present invention, as shown in FIGS. 19 and 20, the operation handle A of the second embodiment (see FIG. 12) or the operation handle of the modification of the second embodiment. A (see FIG. 17) is used, and the shift lever 20 moves in a horizontal plane (including an inclined portion) for conversion. Specifically, in 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 is set in the middle (see Fig. 19). In this case as well, the shift lever 20 is provided with the stopper C, and the positioning pin 13 is provided with the holes H ₂ , H ₃ , and H so that the inclination angle of the operation handle A is high. ₄ is engaged with the stopper C, the abutting portion 21 of the stopper C hits the operation handle A so as not to enter the back gear R, and only when the positioning pin 13 is engaged with the hole H _1. The abutting portion 21 of the stopper C is configured so as to ride over the operation handle A and enter the back gear R. The other components are the same as in the case of the second embodiment, and the explanations are 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, it is generally a groove sliding type, which 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 protruding portion 18 having a relatively short length is attached to the base side of the operating handle A, and an operating handle A is provided at this end via the angle adjusting base B.

As a modified example of the third embodiment, as shown in FIGS. 21 (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 ₂ . This is the case when configured as the forward gear F ₃ . When the positioning pin 13 is engaged with the holes H ₂ , H ₃ , H _{4 so} that the inclination angle of the operation handle A is high, the contact portion 21 of the stopper C is Can be converted into the first forward gear F ₁ , the second forward gear F ₂ , and the third forward gear F ₃ even if it hits the operating handle A, but is configured not to enter the back gear R. . 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 operation handle A is simply raised from the state of entering the back gear R. It will be configured to return to neutral N. This is a so-called automatic return mechanism.

Further, FIGS. 22A to 22C are still another modification of the third embodiment, in which the connecting portion 22 and the contact portion 21 are bent and formed in an angle shape, It is a mechanism in which the operation handle A cannot be lifted from the state in which the back gear R is entered, that is, so-called automatic return is not possible. In this case, after the gear is put into the back gear R, the speed change lever 20 is operated to return to the neutral N, and then the operation handle A is moved up. Other configurations are the same as those of the third embodiment. Since the configuration is the same, the explanation is omitted.

In the fourth embodiment, as shown in FIG. 23, the stopper C is provided on the handle shaft portion 8 or the handle base portion 9a of the operation handle A. 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 21 is formed after bending downward from the connecting portion 22 in an angle shape. , Only when the positioning pin 13 is engaged with the holes H ₂ , H ₃ , H ₄ so that the inclination angle of the operation handle A is high [see FIG. 23 (B)] The lever 20 is in contact with the contact portion 21 so as not to enter the back gear R position. Therefore, when the positioning pin 13 is engaged with the hole H ₁ so that the inclination angle of the operation handle A is reduced [see FIG. 23 (C)], the gear shift lever 20 is moved to the above-mentioned position. The structure is such that the back gear R position is entered without contacting the contact portion 21. 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 functions are the same as those in the second embodiment.

Further, as a fifth embodiment, as shown in FIGS. 24 (A) and 24 (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 this gear is provided. The inclination angle of the operating handle A is provided so as to be adjustable via a tightening screw rod for each circular pitch angle between the teeth. In this case, the speed change lever 20 and the stopper C are configured to move on a horizontal plane as shown in FIG. 22 to change the speed, 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 ascending / descending angle of the operating handle A can be adjusted for each angle of the circular pitch between the gear teeth, the finer adjustment can be made as the circular pitch is reduced. In practice, it is preferable to be adjustable in several stages.

[0041]

[Effect of device]

 According to the first aspect of the present invention, the raising / lowering angle of the operating handle A can be adjusted in a plurality of steps in the cultivator, and only when the raising / lowering angle of the operating handle A is decreased, the back travel can be performed by releasing the stopper C. By adopting the back traveling device for the tiller as described above, firstly, the safety level of the back traveling (reverse traveling) of the tiller can be extremely enhanced, and secondly, the worker's concern during the backward traveling, etc. Can be almost eliminated, and the cultivating work can be done with peace of mind. Thirdly, the danger of work can be eliminated in advance. Furthermore, in normal operation, the lifting angle can be easily changed to multiple stages, There are various effects such as an increase in efficiency.

To describe the above effect in detail, when the cultivator travels back, normally, the reaction force Q (see FIG. 10) is centered around the drive wheel 6 or the cultivator part 5 provided at the middle position of the cultivator. ) 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 an extremely high position, and the worker tries to continue grasping the handshake portion according to the judgment of the moment, so the worker raises both hands high just This forces the user to stretch his back, which makes it difficult to operate the cultivator and causes him to fall behind the cultivator, which is extremely dangerous.

Thus, the elimination of danger in advance is realized by the present invention. That is, the speed change lever 20 can be put into the back gear R only when the operation handle A is lowered, that is, when the tilt angle of the operation handle A is reduced, and therefore the cultivator moves backward. When the operation handle A is always in the low position, the reaction force Q is generated when the cultivator travels backward as described above, and even if the cultivator rotates around the drive wheel 6 or the cultivator portion 5, The handshake portion 8a of the operation handle A does not have to be at a high position, and the safety of the worker can be improved. As a result, it is possible to substantially eliminate the anxiety or the like of the worker's accident when the cultivator is traveling backwards, and it is possible to perform the cultivating work more safely. In addition, it is possible to eliminate in advance the operational risks. As described above, 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 the cultivator can be operated. It has the greatest merit that it is easy to control all the time, it can prevent the danger of the worker when traveling backwards, and the safety of the worker can be greatly enhanced.

Next, according to a second 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. Since the contact portion 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, 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 only comes into contact with the operation handle A when the up-and-down angle of the operation handle A is large. The 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, and the lifting angle of the operation handle A is increased. When the shift lever 20 is put in the back gear R, the shift lever 20 is brought into contact with the abutting portion 21 of the stopper C so that the shift lever 20 is in the back traveling device. The structure of A can be formed without any deformation, and the structure can be made extremely simple.

Next, according to a fourth aspect of the 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. A back traveling device in a cultivator in which an inclined portion 23 that inclines downward from a lower portion of the contact portion 21 is formed, and the inclined portion 23 and the connecting portion 22 of the stopper C are continuously formed. As a result, when the operating handle A is moved from the small up angle to the large up angle during back running, the inclined portion 23 is formed in the stopper C, and the operation handle A is formed so that the inclined portion 23 is substantially the same. By pushing up without resistance, the shifting lever 20 moves together, and by setting the shifting lever 20 to the neutral N position, the cultivator does not run out of control and the worker's safety is maintained. You can improve your sex.

Next, in claim 5, according to claim 1, the operation handle A is composed of two handle shaft portions 8 and 8, and the handlebar portion is closer to the handshake portion side than the base portion side of both handle shaft portions 8 and 8. The gear shift lever 20 is widened in a generally C-shape toward the front side, and the operation range of the speed change lever 20 is a back traveling device in a cultivator housed between the handle shaft portions 8 and 8. Operations such as forward and backward movements can be performed between the two handle shaft portions 8 and 8 of A, whereby the gear shift lever 20 does not particularly extend beyond the both handle shaft portions 8 and 8 of the operation 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 of the first embodiment of the present invention in a back gear state by a shift lever with a stopper.

FIG. 4 is a plan view of a tiller 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. 8 (A) 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. Plan view

9 (A) is an operation diagram in which the shift lever with a stopper is in a neutral state in a modified example of the first embodiment of the present invention. FIG. 9 (B) is a partial cross-sectional view of the transmission mechanism portion in the operation state of (A). 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 an essential part 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 shift lever with a stopper is in a neutral state in the second embodiment of the present invention. FIG. 14 (B) is an operation diagram in which a shift gear 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 adjusting base portion according to a second embodiment of the present invention.

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

FIG. 17 (A) is a plan view of an essential part of a modified example of the second embodiment of the present invention (B) is a sectional view of the handle base frame portion of (A).

FIG. 18 is a side view of FIG.

FIG. 19 is a plan view of an essential part of a 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 of a modified example of the third embodiment of the present invention in a state where it does not enter the back gear, and FIG. 21 (B) does not enter the back gear of the modified example of the third embodiment of the present invention, but a forward gear (C) is the operation diagram of the modification of the third embodiment of the present invention when it is in the 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 it 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 operation diagram in a state in which it is in the back gear.

FIG. 24 (A) is a plan view of an essential part of a fifth embodiment of the present invention. (B) 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)

[Scope of utility model registration request] 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. A cultivator is capable of adjusting a raising / lowering angle of an operating handle in a plurality of steps, and only when the raising / lowering angle of the operating handle is decreased, the stopper is released so that the vehicle can be back-traveled, and the stopper abuts. And a stopper provided at an appropriate position of the shift lever, and the abutting portion abuts only when the operating handle has a large up-and-down angle. apparatus. 3. A cultivator is capable of adjusting the raising / lowering angle of the operating handle in a plurality of steps, and only when the raising / lowering angle of the operating handle is decreased, the stopper is released so as to start back running, and the stopper abuts. In the tiller, the stopper is fixed to the operation handle side, and the shift lever is brought into contact with the contact portion of the stopper only when the up-and-down angle of the operation handle is large. Back traveling device. 4. A cultivator is capable of adjusting a raising / lowering angle of an operating handle in a plurality of steps, and only when the raising / lowering angle of the operating handle is reduced, the stopper is released to start back running, and the stopper abuts. And the stopper is provided at an appropriate position of the shift lever to form an inclined portion that inclines downward from a position below the contact portion of the stopper, and the inclined portion and the connecting portion of the stopper are formed. A back traveling device for a tiller, which is characterized by being formed continuously. 5. A cultivator is capable of adjusting the raising / lowering angle of the operating handle in a plurality of steps, and only when the raising / lowering angle of the operating handle is decreased, the stopper is released to start the backward traveling, and the operating handle is It is composed of a handle shaft portion of a book, and spreads out in a substantially V shape from the base side of both handle shaft portions toward the handshake portion side, and the operation range of the shift lever is set between both handle shaft portions. Back traveling device in a tiller characterized by