Walking type cultivator

Abstract

To easily prevent so-called "dashing" of a machine body in a walking type tending machine in which a clutch lever for operating a tilling rotary and a clutch for transmitting power to the tilling rotary is a deadman lever which is gripped together with a horizontal lever of a steering handle.SOLUTION: A handle grip part 14 in a horizontal lever 6c of a steering handle 6 is gripped by a thumb 41, and a lever grip part 13 of a main clutch lever 10 is gripped by four fingers 42. A curvature radius R2 of a four finger grip part 38 gripped by the four fingers 42 of the lever grip part 13 is larger than a curvature radius R1 of a thumb grip part 40 gripped by the thumb 41 of the handle grip part 14.SELECTED DRAWING: Figure 5

Description

Technical Field

[0005] , , ,

[0001] The present invention relates to a walking type management machine.

Background Art

[0002] As shown in Patent Document 1, there is a walking type management machine including a machine body (vehicle body frame), a steering handle (steering handle) extended rearward from the machine body, a tilling rotary (tilling shaft, tilling claws), a clutch (main clutch mechanism) capable of switching between a clutch engaged state for power transmission to the tilling rotary and a clutch disengaged state for disconnecting power transmission to the tilling rotary, and a main clutch lever (dead man clutch lever) supported by the steering handle in a swingable state with a pivot axis extending in the left - right direction of the machine body as a swing fulcrum for switching the clutch.

[0003] In this walking type management machine, the steering handle includes left - right front - rear rods (a pair of left - right connecting bars) and a lateral rod (width - direction gripping bar) connecting the rear parts of the left - right front - rear rods. The main clutch lever is a dead man lever that is operated to the clutch engaged state (clutch engagement position) by being gripped together with a handle gripping part (width - direction gripping bar) located on the lateral rod of the steering handle at a lever gripping part (width - direction bar) of the main clutch lever, and is operated to the clutch disengaged state (clutch release position) by a biasing force when the co - gripping with the handle gripping part of the lever gripping part is released.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In this type of walk-behind tiller, if there are hard patches of soil in the field, the tilling rotary may have difficulty penetrating the soil and may be positioned on the ground side due to the tilling reaction force, causing the tilling rotary to move forward, or the machine to "dash." There is a need for a mechanism that can easily prevent the machine from dashing while maintaining the clutch engaged by gripping the main clutch lever together with the sideways rod of the steering handle.

[0006] The present invention provides a walking-type tiller that maintains the clutch engaged by gripping the main clutch lever together with the lateral rod of the control handle, while also making it easier to prevent the machine from dashing. [Means for solving the problem]

[0007] The walking-type management machine according to the present invention 、 The machine comprises a machine body, a control handle extending rearward from the machine body and having left and right front-to-back rods and a lateral rod connecting the rear ends of the left and right front-to-back rods, a tilling rotary, a clutch switchable between a clutch-engaged state that transmits power to the tilling rotary and a clutch-disengaged state that disconnects power transmission to the tilling rotary, and a main clutch lever supported by the control handle in a state that allows it to swing around a pivot axis extending in the left-to-right direction of the machine body as a pivot point, and for operating the clutch, wherein the main clutch lever is operated to the clutch-engaged state when the lever grip portion of the main clutch lever is gripped together with the handle grip portion located on the lateral rod, and when the joint grip of the lever grip portion and the handle grip portion is released, the lever grip portion is moved forward from the handle grip portion by a disengaging force, thereby operating the clutch in the disengaged state, and is a deadman lever. A projection is provided between the lever grip portion and the handle grip portion, The handle grip portion is configured to be gripped by the thumb of the hand, and the lever grip portion is configured to be gripped by the four fingers other than the thumb of the hand, and of the lever grip portion, the four-finger grip portion that is gripped by the four fingers Top surfaceThe radius of curvature when viewed in the direction along the pivot axis is set to be larger than the radius of curvature when viewed in the direction along the pivot axis of the thumb grip portion of the handle grip portion that is gripped by the thumb.

[0008] In this configuration, the main clutch lever is operated to engage the clutch when the lever grip portion of the main clutch lever is gripped together with the handle grip portion located on the lateral rod portion. Therefore, the clutch can be maintained in the engaged state by gripping the main clutch lever together with the lateral rod portion of the steering handle. The main clutch lever is a deadman lever that, when the grip portion of the lever and the handle grip are released, is operated to disengage the clutch by the disengaging force which moves the lever grip portion forward away from the handle grip portion. Therefore, when the lever grip portion is released from the hand that is gripping it together with the handle grip portion, the clutch disengages and the tilling rotary stops, thus preventing the machine from accelerating.

[0009] The radius of curvature of the four-finger grip portion of the lever, when viewed along the pivot axis, is set to be larger than the radius of curvature of the thumb grip portion of the handle, when an operating force is applied to the lever grip in the direction that would cause the aircraft to dash, the lever grip is more likely to come off the hand. Therefore, while the main clutch lever is held together with the horizontal rod of the control handle to maintain the clutch engaged, it is easier to prevent the aircraft from dashing.

[0010] In the present invention, Preferably, the front end portion of the lever grip portion, which is located in front of the four-finger grip portion when both the lever grip portion and the handle grip portion are gripped, tilts forward and downward when both the lever grip portion and the handle grip portion are gripped.

[0011] With this configuration, when the lever grip is held together with the handle grip, the front end is tilted downwards and forwards, so the fingertips do not grip the front end very firmly. This makes it easier for the lever grip to slip from the hand when the machine is about to dash, thus making it easier to prevent the machine from dashing.

[0012] In the present invention, Preferably, the thumb grip portion faces downward, and the four-finger grip portion faces upward when both the lever grip portion and the handle grip portion are gripped and operated.

[0013] With this configuration, when gripping the lever grip together with the handle grip, the downward angle of the thumb grip makes it easier for the thumb to rest on the handle grip, making it easier to firmly grip the handle. When the machine is about to dash, the upward angle of the four-finger grip makes it easier for the main clutch lever to slip from the hand. This makes it easy to firmly grip the handle while also making it easier to prevent the machine from dashing. [Brief explanation of the drawing]

[0014] [Figure 1] This is a side view of a walk-behind type management machine. [Figure 2] This is a plan view of a walk-behind type cultivator. [Figure 3] This is a block diagram of the power transmission system. [Figure 4] This is a rear view of the left main clutch lever, the right main clutch lever, the steering handle, and the gear shift lever. [Figure 5] This is a diagram illustrating how to grip both the lever and the handlebars together. [Modes for carrying out the invention]

[0015] Hereinafter, an embodiment of the present invention will be described based on the drawings. In the following description, regarding the body of the walking-type management machine, the direction of arrow F shown in FIGS. 1 and 2 is the "front side of the body", the direction of arrow B shown in FIGS. 1 and 2 is the "rear side of the body", the direction of arrow U shown in FIG. 1 is the "upper side of the body", the direction of arrow D shown in FIG. 1 is the "lower side of the body", the direction of arrow L shown in FIG. 2 is the "left side of the body", and the direction of arrow R shown in FIG. 2 is the "right side of the body".

[0016] 〔Overall Configuration of the Walking-Type Management Machine〕 As shown in FIGS. 1 and 2, the walking-type management machine includes a body 2 supported by a pair of left and right traveling wheels 1. A power unit 4 having an engine 3 is provided at the front of the body 2. A tilling device 5 is provided at the rear of the body 2. A steering handle 6 extends rearward from a handle support portion 6a provided at the rear of the body 2. The body 2 is composed of a transmission case 7, an engine frame 8 that extends forward from the front of the transmission case 7 to support the engine 3, and the like. A shift lever 9 extends rearward from the upper part of the transmission case 7. The shift lever 9 is located above the steering handle 6. At the rear of the steering handle 6, a main clutch lever 10, a differential lock lever 11, and an accelerator operating tool 19 for adjusting the rotational speed of the engine 3 are provided.

[0017] 〔Tilling Device〕 As shown in FIG. 1, the tilling device 5 is provided adjacent to the rear of the pair of left and right traveling wheels 1. The tilling device 5 includes a tilling rotary 15, a cover 16 for the tilling rotary 15, and a resistance bar 17.

[0018] The tilling rotary 15 includes a drive shaft 15a that is rotatably supported by the transmission case 7 in a state of penetrating the lower rear part of the transmission case 7 from left to right, and a plurality of tilling claws 15b supported by the drive shaft 15a on the left and right outer sides of the transmission case 7. The tilling claws 15b can be attached to the drive shaft 15a with their posture changed to a posture for down-cutting and a posture for up-cutting. The drive shaft 15a can be driven by switching between the forward rotation direction a shown in FIGS. 1 and 3 and the reverse rotation direction b shown in FIG. 3.

[0019] [Power Transmission Device] Figure 3 is a block diagram showing a power transmission device 20 that transmits power from an engine 3 to a tilling device 5 and drive wheels 1. In the power transmission device 20, the output of the engine 3 is input to a main clutch 21, and the output of the main clutch 21 is input to a transmission case 7, and is distributed and transmitted from the transmission case 7 to a tilling rotary 15 and the drive wheels 1. As shown in Figure 3, the transmission case 7 is provided with a rotary speed change section 22, a working clutch 23, a traveling speed change section 24, a traveling clutch 25, and a wheel differential mechanism 26.

[0020] When the main clutch 21 is switched to the clutch-engaged state, it inputs the power from the engine 3 to the transmission case 7, enabling the driving of the drive wheels 1 and the tilling rotary 15. When it is switched to the clutch-disengaged state, it cuts off the input from the engine 3 to the transmission case 7 and stops the drive wheels 1 and the tilling rotary 15. The switching operation between the clutch-engaged state and the clutch-disengaged state of the main clutch 21 is performed by a main clutch lever 10 linked to the main clutch 21 by an operating cable (not shown) or the like.

[0021] The rotary speed change section 22 is configured to be switchable between forward rotation transmission and reverse rotation transmission. When switched to forward rotation transmission, the power from the main clutch 21 is converted into forward rotation power and output. When switched to reverse rotation transmission, the power from the main clutch 21 is converted into reverse rotation power and output. The forward rotation power is the power that drives the drive shaft 15a of the tilling rotary 15 in the forward rotation direction a (see Figures 1 and 3). The reverse rotation power is the power that drives the drive shaft 15a of the tilling rotary 15 in the reverse rotation direction b (see Figure 3). The switching operation between the forward rotation transmission and the reverse rotation transmission of the rotary speed change section 22 is performed by a speed change lever 9 (see Figure 1).

[0022] When the work clutch 23 is switched to the clutch-engaged state, it transmits forward or reverse rotational power from the rotary transmission unit 22 to the drive shaft 15a, driving the tilling rotary 15 in the forward rotation direction a (see Figure 1) or the reverse rotation direction b (see Figure 3). When the clutch is switched to the disengaged state, it cuts off the power transmission from the rotary transmission unit 22 to the drive shaft 15a, stopping the tilling rotary 15. The operation of switching the work clutch 23 between the clutch-engaged and disengaged states is performed by the differential lock lever 11 (see Figure 1), which is linked to the work clutch 23 by an operating cable (not shown), etc.

[0023] In the drive transmission unit 24, power from the main clutch 21 is input, and the input power is converted into multiple forward power levels and one reverse power level and output. The drive transmission unit 24 is operated by the gear shift lever 9 (see Figure 1). The drive speed of the drive wheels 1 is changed by the gear shift lever 9, which changes the driving speed of the machine body 2.

[0024] When the drive clutch 25 is switched to the clutch-engaged state, it transmits forward or reverse power from the drive transmission unit 24 to the wheel differential mechanism 26, enabling forward or reverse drive of the drive wheels 1. When the clutch is switched to the disengaged state, it cuts off the transmission of power from the drive transmission unit 24 to the wheel differential mechanism 26, stopping the drive wheels 1.

[0025] The wheel differential mechanism 26 is configured to be switchable between differential-permitted transmission and differential-locked transmission. When the wheel differential mechanism 26 is switched to differential-permitted transmission, power from the travel clutch 25 is transmitted to the left and right pair of travel wheels 1, and this power transmission is performed while permitting differential movement between the left and right pair of travel wheels 1. When the wheel differential mechanism 26 is switched to differential-locked transmission, power from the travel clutch 25 is transmitted to the left and right pair of travel wheels 1, and this power transmission is performed while preventing differential movement between the left and right pair of travel wheels 1. The switching operation between differential-permitted transmission and differential-locked transmission of the wheel differential mechanism 26 is performed by a differential lock lever 11 (see Figure 1) which is linked to the wheel differential mechanism 26 by an operating cable (not shown) or the like.

[0026] 〔cover〕 As shown in Figure 1, the cover 16 is configured to cover the tilling rotary 15 from above. Specifically, as shown in Figures 1 and 2, the cover 16 is formed in an arc shape when viewed in the direction along the drive shaft 15a and comprises a cover body 16a located around the outer circumference of the tilling rotary 15, and left and right lateral cover portions 16b extending downward from both sides of the cover body 16a. The cover body 16a is fixed to the transmission case 7 at its front. The left and right lateral cover portions 16b are fixed to the transmission case 7 via the cover body 16a.

[0027] [Operating structure of the main clutch] As shown in Figure 2, the control handle 6 comprises left and right forward-facing rods 6b extending in the longitudinal direction of the aircraft 2, and a lateral rod 6c connecting the rear ends of the left and right forward-facing rods 6b. The lateral rod 6c extends in the left-right direction of the aircraft 2. The control handle 6 is configured as a loop-type handle.

[0028] In this embodiment, as shown in Figures 2 and 4, the main clutch lever 10 is equipped with a left main clutch lever 10L and a right main clutch lever 10R.

[0029] As shown in Figures 1 and 4, the left main clutch lever 10L and the right main clutch lever 10R each have a pivot shaft 12 provided at the base of the left main clutch lever 10L and the right main clutch lever 10R, and a lever grip portion 13 formed on the tip portion of the left main clutch lever 10L and the right main clutch lever 10R. The lever grip portion 13 is bent inward in the left-right direction of the aircraft body 2 relative to its base and extends parallel to the lateral rod portion 6c of the control handle 6. The left main clutch lever 10L and the right main clutch lever 10R are bent from their respective bases to their respective lever grip portions 13.

[0030] As shown in Figures 1 and 4, the pivot shaft 12 of the left main clutch lever 10L is connected to the left support portion 6d provided on the control handle 6. The left support portion 6d is provided on the left front-to-back rod portion 6b. The pivot shaft 12 has a pivot shaft core P that extends in the left-to-right direction of the aircraft body 2. The left main clutch lever 10L is supported on the left front-to-back rod portion 6b such that the portion on the side where the lever grip portion 13 is located can swing above the lateral rod portion 6c with the pivot shaft core P as the pivot point.

[0031] As shown in Figures 1 and 4, the pivot shaft 12 of the right main clutch lever 10R is connected to the right support portion 6d provided on the control handle 6. The right support portion 6d is provided on the right front-to-back oriented rod portion 6b. The pivot shaft 12 has a pivot shaft core P that extends in the left-to-right direction of the aircraft body 2. The right main clutch lever 10R is supported on the right front-to-back oriented rod portion 6b so that the portion on the side where the lever grip portion 13 is located can swing in the front-to-back direction above the lateral rod portion 6c with the pivot shaft core P as the pivot point. The pivot shaft core P of the left main clutch lever 10L and the pivot shaft core P of the right main clutch lever 10R are set on the same axis.

[0032] As shown in Figure 2, the base of the left main clutch lever 10L and the operating part (not shown) of the main clutch 21 are linked by a linkage mechanism 30, allowing the main clutch 21 to be switched between the clutch-engaged and clutch-disengaged states by swinging the left main clutch lever 10L. In this embodiment, the linkage mechanism 30 is composed of an operating cable 31, etc. As shown in Figures 2 and 4, the base of the left main clutch lever 10L and the base of the right main clutch lever 10R are linked together by a connecting rod 32, allowing the main clutch 21 to be switched between the clutch-engaged and clutch-disengaged states by swinging the right main clutch lever 10R. That is, when the right main clutch lever 10R is swung, the swing of the right main clutch lever 10R is transmitted to the left main clutch lever 10L via the connecting rod 32, causing the left main clutch lever 10L to swing, and the main clutch 21 is switched via the linkage mechanism 30 by the left main clutch lever 10L.

[0033] As shown in Figure 4, the connecting rod 32 passes through the aircraft body 2 in the left-right direction at a point lower than the lateral rod portion 6c of the control handle 6. The connecting rod 32 passes below the operating lever 19a of the accelerator control device 19 in the left-right direction of the aircraft body 2.

[0034] As shown in Figures 2 and 4, the horizontal rod portion 6c of the steering handle 6 is provided with a handle grip portion 14 corresponding to the lever grip portion 13 of the left main clutch lever 10L, and a handle grip portion 14 corresponding to the lever grip portion 13 of the right main clutch lever 10R.

[0035] In the case of the left main clutch lever 10L and the right main clutch lever 10R, as shown in Figure 5, when the left main clutch lever 10L and the right main clutch lever 10R are swung toward the lateral rod portion 6c of the steering handle 6, it becomes possible to grip both the lever grip portion 13 and the handle grip portion 14 together. When the lever grip portion 13 is gripped together with the handle grip portion 14, the left main clutch lever 10L and the right main clutch lever 10R enter the clutch-engaged state [on] (see Figure 1). In this embodiment, as shown in Figure 5, when the lever grip portion 13 is gripped together with the handle grip portion 14, a projection 35 provided on the back side of the lever grip portion 13 contacts the handle grip portion 14, positioning the left main clutch lever 10L and the right main clutch lever 10R in the clutch-engaged state [on]. When the left main clutch lever 10L is gripped together with the steering handle 6, the oscillation of the left main clutch lever 10L is transmitted to the main clutch 21 via the linkage mechanism 30, and the main clutch 21 is switched to the clutch-engaged state. When the right main clutch lever 10R is gripped together with the steering handle 6, the oscillation of the right main clutch lever 10R is transmitted to the main clutch 21 via the connecting rod 32, the left main clutch lever 10L, and the linkage mechanism 30, and the main clutch 21 is switched to the clutch-engaged state.

[0036] When the joint grip of the lever grip portion 13 with the handle grip portion 14 is released, the disengaging force provided in the main clutch 21 causes the lever grip portion 13 to move forward and away from the handle grip portion 14, operating the left main clutch lever 10L and the right main clutch lever 10R to the clutch disengaged state [disengaged] (see Figure 1), and the main clutch 21 is switched to the clutch disengaged state. The left main clutch lever 10L and the right main clutch lever 10R are configured as deadman levers.

[0037] In the left main clutch lever 10L and the right main clutch lever 10R, when both the lever grip portion 13 and the handle grip portion 14 are gripped, as shown in Figure 5, the handle grip portion 14 is configured to be gripped by the thumb 41 of the hand, and the lever grip portion 13 is configured to be gripped by the four fingers 42 of the hand other than the thumb.

[0038] As shown in Figure 5, the thumb grip portion 40 of the handle grip portion 14, which is gripped by the thumb 41, is formed in a curved shape with a radius of curvature R1. The four-finger grip portion 38 of the lever grip portion 13, which is gripped by the four fingers 42, is formed in a curved shape with a radius of curvature R2. The radius of curvature R2 of the four-finger grip portion 38 is set to be larger than the radius of curvature R1 of the thumb grip portion 40.

[0039] As shown in Figure 5, when both the lever grip portion 13 and the handle grip portion 14 are gripped, the front end portion 39 of the lever grip portion 13, which is located in front of the four-finger grip portion 38, is tilted downward and forward.

[0040] As shown in Figure 5, the thumb grip portion 40 is configured to face downwards. The four-finger grip portion 38 is configured to face upwards when both the lever grip portion 13 and the handle grip portion 14 are gripped.

[0041] When performing work, the main clutch 21 is kept engaged by gripping the lever grip portion 13 together with the handle grip portion 14 on either the left main clutch lever 10L or the right main clutch lever 10R, thereby driving the driving wheels 1 and the tilling rotary 15.

[0042] If there are hard patches of soil in the field, the tilling rotary 15 may have difficulty penetrating the soil and remain on the ground side. As the tilling rotary 15 is driven at a faster rotational speed than the running wheels 1, it may move and the machine 2 may dash. When the machine 2 attempts to dash, an operating force is applied that pushes the lever grip 13 away from the hand. The four-finger grip 38 has a curved shape with a radius of curvature R2 that is larger than the radius of curvature R1 of the thumb grip 40, and is also angled upwards. Furthermore, the front end portion 39 is angled downwards and forwards, making it easy for the lever grip 13 to slip from the hand. This makes it easy for the left main clutch lever 10L and the right main clutch lever 10R to switch to the clutch-disengaged state [disengaged], causing the main clutch 21 to switch to the clutch-disengaged state, stopping the running wheels 1 and the tilling rotary 15, and preventing the machine 2 from dashing.

[0043] As shown in Figures 2 and 4, a space S is provided between the end 13a of the left main clutch lever 10L on the side facing the aircraft body, i.e., the end on which the lever grip portion 13 is located, and the end 13b of the right main clutch lever 10R on the side facing the aircraft body, i.e., the end on which the lever grip portion 13 is located. The left main clutch lever 10L and the right main clutch lever 10R are separated in the left-right direction of the aircraft body 2 by the space S. As shown in Figure 2, in a plan view, the gear shift lever 9 is positioned in front of the space S. The gear shift lever 9 can be operated from behind the control handle 6 in a manner that is less likely to be obstructed by the left main clutch lever 10L and the right main clutch lever 10R.

[0044] In this embodiment, the main clutch lever 10 is equipped with a left main clutch lever 10L and a right main clutch lever 10R. As the main clutch lever 10, it is possible to use a single loop-type clutch lever that extends across the left and right front-to-back rod portions 6b of the steering handle 6. In the following description, the left main clutch lever 10L and the right main clutch lever 10R will be referred to as the main clutch lever 10.

[0045] In the main clutch lever 10, as shown in Figure 5, the four-finger grip portion 38 is made of resin. Natural rubber, synthetic rubber, and other materials can be used as the resin.

[0046] The front end portion 39 of the lever grip portion 13 is integrally molded with the four-finger grip portion 38 and is made of resin.

[0047] As shown in Figures 4 and 5, the main clutch lever 10 is equipped with a base portion 36 supported by a front-to-back rod portion 6b so as to be able to swing around a pivot axis P. In this embodiment, the base portion 36 is made of a metal such as aluminum alloy or iron. The rigidity of the main clutch lever 10 is increased by the base portion 36. The base portion 36 is not limited to metal; it can be made of a suitable material such as plastic.

[0048] The four-finger grip portion 38 is detachably attached to the base portion 36. The main clutch lever 10 can be repaired by replacing the four-finger grip portion 38 without replacing the base portion 36. The detachable attachment of the four-finger grip portion 38 to the base portion 36 is achieved by providing the four-finger grip portion 38 with a projection 35 that protrudes from the back of the four-finger grip portion 38 toward the base portion 36, as shown in Figures 4 and 5. A mounting hole 37 is provided through the base portion 36, and the projection 35 is fitted into the mounting hole 37. In this embodiment, the projection 35 is integrally molded with the four-finger grip portion 38 and is made of resin. The projection 35 may also be made of metal or the like as a separate component from the four-finger grip portion 38, and attached to the four-finger grip portion 38 by embedding the base of the projection 35 in the four-finger grip portion 38.

[0049] As shown in Figure 4, the base portion 36 is provided with a first portion 36a and a second portion 36b. The first portion 36a is supported by a support portion 6d on the front-rear oriented rod portion 6b so as to be able to swing around the pivot axis P. The second portion 36b extends from the free end portion of the first portion 36a inward in the lateral direction of the aircraft body 2, parallel to the lateral rod portion 6c of the control handle 6.

[0050] As shown in Figures 4 and 5, the four-finger grip portion 38 is attached to the second portion 36b. In this embodiment, the four-finger grip portion 38 is provided with an extension portion 38a that extends to the first portion 36a, and the four-finger grip portion 38 is positioned from the second portion 36b to a part of the first portion 36a and is attached to both the first portion 36a and the second portion 36b. The four-finger grip portion 38 is attached to the first portion 36a and the second portion 36b by providing projections 35 at both ends and in the middle of the four-finger grip portion 38 that fit into mounting holes 37 of the base portion 36. In this embodiment, projections 35 are provided at three locations on the four-finger grip portion 38, but projections 35 may be provided at only two locations, one at one end and the other end of the four-finger grip portion 38, or at four or more locations.

[0051] In this embodiment, the four-finger grip portion 38 is arranged from the second portion 36b to a part of the first portion 36a, but it is not limited to this. For example, the four-finger grip portion 38 may be arranged only in the second portion 36b. In addition, a configuration may be adopted in which the four-finger grip portion 38 is arranged from the second portion 36b to a part of the first portion 36a of the base portion 36, or in which the four-finger grip portion 38 is arranged over the entirety of the second portion 36b to the first portion 36a, that is, over the entire base portion 36.

[0052] When the four-finger grip portion 38 is attached to the base portion 36, the projection 35 protrudes from the back side of the base portion 36. When the main clutch lever 10 is gripped together with the steering handle 6, the projection 35 contacts the steering handle grip portion 14, creating a gap between the lever grip portion 13 and the steering handle grip portion 14. This gap prevents the operator's hand from being pinched during gripping. Furthermore, since the projection 35 is elastically deformable, it can suppress the noise of contact with the steering handle 6. In addition, when performing work, it is necessary to maintain the grip on the main clutch lever 10, and the elasticity of the projection 35 can suppress the transmission of vibrations caused by the work to the operator.

[0053] [Another embodiment] (1) In the above embodiment, the main clutch lever 10 is provided with a base portion 36 and a resin four-finger grip portion 38 is attached to the base portion 36, so that the main clutch lever 10 is configured such that the four-finger grip portion 38 of the main clutch lever 10 is made of resin. However, the embodiment is not limited to this, and the main clutch lever 10 may be configured such that the base portion 36 is not provided and the entire main clutch lever 10 is made of resin, so that the four-finger grip portion 38 of the main clutch lever 10 is made of resin.

[0054] (2) In the above-described embodiment, an example was shown in which the main clutch lever 10 is provided with a left main clutch lever 10L and a right main clutch lever 10R. However, it is also possible to provide only one loop-type main clutch lever 10 that spans the front-to-back oriented rod portion 6b on the left side and the front-to-back oriented rod portion 6b on the right side of the steering handle 6. In the case of a loop-type main clutch lever 10, it is provided with a base portion having left and right first portions that are pivotably attached to the left and right front-to-back oriented rod portions 6b on the left and right sides of the steering handle 6 around a pivot axis P, and a second portion that spans the free ends of the left and right first portions, with a resin four-finger grip portion 38 attached only to the second portion, or a resin four-finger grip portion 38 that spans the second portion and the left and right first portions.

[0055] (3) In the above-described embodiment, an example was shown in which the vehicle is equipped with a traveling wheel 1 and a main clutch 21 that transmits power to the traveling wheel 1 and the tilling rotary 15. However, the tilling rotary 15 may be mounted on the axle instead of the traveling wheel 1, and the main latch lever that operates the clutch that transmits power to the tilling rotary 15 may be configured as a deadman lever.

[0056] (4) In the above-described embodiment, the left main clutch lever 10L of the left main clutch lever 10L and the right main clutch lever 10R is linked to the main clutch 21 by the linkage mechanism 30, and the left main clutch lever 10L and the right main clutch lever 10R are connected by a connecting rod 32. However, the right main clutch lever 10R of the left main clutch lever 10L and the right main clutch lever 10R may be linked to the main clutch 21 by the linkage mechanism, and the left main clutch lever 10L and the right main clutch lever 10R may be connected by a connecting rod 32.

[0057] (5) In the above-described embodiment, an example was shown in which a connecting rod 32 is provided to connect the left main clutch lever 10L and the right main clutch lever 10R. However, the connecting rod 32 may not be provided, and the left main clutch lever 10L and the right main clutch lever 10R may be individually linked to the main clutch 21.

[0058] (6) In the above-described embodiment, an example was shown in which the gear shift lever 9 is located in front of the space S. However, the embodiment is not limited to this, and other operating devices may be located in front of the space S.

[0059] (7) In the embodiment described above, an example was shown in which the front end portion 39 is inclined forward and downward, but it may also be in a state in which it is bent at a right angle to the four-finger grip portion 38.

[0060] (8) In the above-described embodiment, an example was shown in which the lever grip portion 13 is plate-shaped, but it is not limited to this. For example, it may be formed by flattening a pipe-shaped member to create an elliptical or rectangular cross-section. Also, in the above-described embodiment, an example was shown in which the steering handle 6 has a circular cross-section, but it is not limited to this, and the cross-section may be elliptical or other shapes other than circular.

[0061] (9) In the embodiments described above, the lever grip portion 13 of the left main clutch lever 10L and the right main clutch lever 10R was shown to be composed of a base portion 36 and a resin four-finger grip portion 38, but it is not limited to this. The lever grip portion 13 may be composed only of a resin member having a resin four-finger grip portion 38, or it may be a base portion 36 and a resin member surrounding the base portion 36 with the resin four-finger grip portion 38, so that the base portion 36 is surrounded by the resin member around its entire circumference and becomes a core member.

[0062] (10) In the above-described embodiment, the left main clutch lever 10L and the right main clutch lever 10R are shown to have a base portion 36 and a resin four-finger grip portion 38 attached to the front side of the base portion 36. However, the base portion 36 may also be provided with a resin portion on the back side in addition to the front side.

[0063] (11) In the embodiment described above, an example was shown in which a space S is provided between the end 13a of the left main clutch lever 10L on the side of the machine body and the end 13b of the right main clutch lever 10R on the side of the machine body. However, the invention is not limited to this, and the left main clutch lever 10L and the right main clutch lever 10R may be connected rather than separated.

[0064] (12) In the embodiment described above, as shown in Figure 4, an example is shown in which protrusions 35 are formed on both ends and the middle part of the four-finger grip portion 38. By attaching the four-finger grip portion 38 to the base portion 36 at these three locations, the attachment state can be stabilized. The location and number of protrusions 35 can be changed in various ways, but this is not limited to this example. [Industrial applicability]

[0065] The present invention can be applied to a walk-behind tiller equipped with a steering handle extending rearward from the machine body, a tilling rotary, and a clutch for transmitting power to the tilling rotary. [Explanation of Symbols]

[0066] 2 units 6. Control Steering Wheel 6b Front and rear oriented rod 6c Horizontal rod 10 Main clutch lever 10L Left main clutch lever 10R Right main clutch lever 13 Lever grip 14 Handle grip 15 Rotary tiller 21 Main clutch (clutch) 35 Protrusion 38. Four-finger grip section 39 Front end part 40 Thumb grip 41 Thumb 42 Four fingers P Pivot axis R1 radius of curvature R2 radius of curvature

Claims

1. The aircraft and, A control handle extending rearward from the aircraft body, comprising left and right forward-facing rods and a lateral rod connecting the rear ends of the left and right forward-facing rods, Rotary tiller and A clutch that can be switched between a clutch-engaged state that transmits power to the tilling rotary and a clutch-disengaged state that disconnects power transmission to the tilling rotary, The aircraft is equipped with a main clutch lever for switching the clutch, which is supported by the control handle in a state that allows it to swing around a pivot axis extending in the left-right direction of the aircraft as the pivot point, The main clutch lever is a deadman lever that operates in a clutch-engaged state when the lever grip portion of the main clutch lever is gripped together with the handle grip portion located on the lateral rod portion, and when the joint grip of the lever grip portion and the handle grip portion is released, the lever grip portion is moved forward from the handle grip portion by the cutting force, thereby operating in a clutch-disengaged state. A projection is provided between the lever grip portion and the handle grip portion, The handle grip is configured to be held by the thumb of the hand, The lever grip portion is configured to be gripped by the four fingers of the hand, excluding the thumb. A walk-behind cultivator in which the radius of curvature of the upper surface of the four-finger grip portion, which is gripped by the four fingers, when viewed in the direction along the pivot axis, is set to be greater than the radius of curvature of the thumb grip portion, which is gripped by the thumb, when viewed in the direction along the pivot axis.

2. The walking type cultivator according to claim 1, wherein the front end portion of the lever grip portion, which is located in front of the four-finger grip portion when both the lever grip portion and the handle grip portion are gripped, is tilted forward and downward when both the lever grip portion and the handle grip portion are gripped.

3. The aforementioned thumb grip portion is facing downwards, The walking-type cultivator according to claim 1, wherein the four-finger grip portion is raised when both the lever grip portion and the handle grip portion are gripped.

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