JP6910281B2 - Walking work machine - Google Patents

Description

The present invention relates to a cultivating device capable of cultivating work while traveling between furrows, and a walking type working machine provided with means capable of scraping up cultivated soil to the left and right located behind the cultivating device.

In the walking type work machine, weeding, medium cultivation work for the purpose of improving soil air permeability, and soil cultivation work for the main purpose of preventing the occurrence of adventitious roots and crop lodging may be performed. The middle tillage work and the soil cultivation work are carried out by scraping the soil cultivated by the tillage device to the left and right.
As a walking type working machine of this type, for example, the technique described in the following [1] is already known.
[1] A soil hilling plate with the upper end side supported by the rear hitch is provided in a state of being located on the rear side of the tilling device, and the resistance rod is grounded on the rear side of the soil cultivation plate so that the soil cultivation work can be performed. Constructed (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2013-236587 (see paragraphs "0037", "FIG. 1", and "FIG. 4")

As described in [1] above, a structure in which soil cultivation work is performed using a soil cultivation plate made of a rubber plate or a synthetic resin plate is useful in that the weight of the soil cultivation device can be reduced. be.
However, in this structure, since the upper end of the hilling plate is supported by the rear hitch, the vertical length of the hilling plate tends to be longer than necessary. In other words, the vertical length of the soil-cultivating plate required for the actual soil-cultivating work is about the height of the ridges, but the upper and lower parts of the soil-cultivating plate are supported by the rear hitch at a higher position. As the directional length, a length corresponding to the distance from the lower end to the mounting position on the rear hitch is required. For this reason, the hilling plate becomes larger than the size required for the hilling work, and there is a problem that the weight increases and the amount of material used increases accordingly.
In addition, when the vertical length of the hilling plate becomes long, the moment due to the earth pressure acting on the lower end side of the hilling plate becomes large, and the posture of the hilling plate is stabilized against the relatively large external force caused by the moment. There is room for improvement in that a strong support structure is required to maintain the hilling.

The present invention aims to reduce the size and weight of the support structure of the plate-shaped member when the cultivated soil is reduced in size and weight by using a plate-shaped member capable of scraping up the cultivated soil to the left and right.

In order to achieve the above object, the walk-behind work machine according to the present invention is a walk-behind work machine provided with a drive traveling device and capable of plowing work traveling between furrows, and a control handle is connected by an operator. The main body of the aircraft to be operated, the tilling device supported at the rear part of the main body of the aircraft, and the state of being located behind the tilling device, supported by the main body of the aircraft via a support member, and in the field during the traveling of the tilling work. A traveling assisting tool that touches the ground to assist the traveling posture of the main body of the machine, and a traveling assisting tool that is provided behind the tilling device and scrapes up the soil cultivated by the tilling device into the left and right ridges while elastically deforming the soil during the tilling work. When a possible plate-shaped member is provided, the plate-shaped member is supported by the support member, has higher rigidity than the plate-shaped member, and the plate-shaped member attempts to be displaced rearward. The plate-shaped member is provided with a reinforcing member that comes into contact with the support member and regulates the rearward deformation of the plate-shaped member .

According to the present invention, since a plate-shaped member capable of elastically deforming cultivated soil and scraping it up to the left and right ridges is used, a large-scale plow-shaped soil cultivating device is not required, and a lightweight and compact plate-like shape is used. The soil can be cultivated depending on the material.
Since the plate-shaped member uses a support member for supporting the traveling assisting tool supported by the machine body as a mounting means, it does not require a dedicated mounting means for the machine body and has a mounting structure. It can be simplified.
Moreover, by using the support member for supporting the traveling assisting tool as the mounting means, the vertical dimension of the plate-shaped member for hilling can be shortened. That is, the distance from the mounting position to the support member for supporting the traveling assisting tool to the lower end of the hilling plate-shaped member is provided, not the distance from the mounting position to the machine body to the lower end of the hilling plate-shaped member. The distance can be shortened to about the vertical dimension required for hilling work.
As a result, the plate-shaped member for hilling can be miniaturized, and the external force such as the moment due to the earth pressure during the hilling work, which acts on the mounting position of the plate-shaped member, can be relatively small. It is easy to reduce the size and weight by suppressing the required strength.

In the above configuration, it is preferable that the support member is supported by the airframe body in a state where the height position can be adjusted.

According to this configuration, the height adjusting structure of the support member for supporting the traveling assisting tool can also be used as the height adjusting means of the plate-shaped member for hilling.

In the above configuration, the support member is a long member extending vertically, a stay extending in the left-right direction of the machine body is supported at an intermediate portion in the extending direction of the support member, and an upper end portion of the plate-shaped member is attached to the stay. It is preferable that it is supported.

According to this configuration, it is not necessary to set the height position of the upper end portion of the plate-shaped member to an unnecessarily high position such as the rear hitch of the machine body, and the soil cultivation work is performed at the intermediate portion in the extending direction of the support member. The appropriate height position required for the above can be selected and provided.

In the above configuration, a frame material extending along the left-right direction of the machine body is attached to the upper end portion of the plate-shaped member, and the frame material and the stay are connected by a fixing mechanism in a state of being face-to-face in the front-rear direction of the machine body. It is preferable that it is.

According to this configuration, the frame material extending in the left-right direction of the machine body is connected to the stay extending in the left-right direction of the machine body at the intermediate portion in the extension direction of the support member in a face-to-face state, so that the plate-shaped member is wide in the left-right direction. The external force acting on the range can be received by the support member, and it is easy to maintain the soil-cultivating posture of the plate-shaped member in a stable manner.

In the above configuration, it is preferable that the frame material is connected to the stay in a state of being face-to-face with the front surface portion of the stay from the front side.

According to this configuration, the frame material provided at the upper end of the plate-shaped member is face-to-face with the front surface of the stay provided at the support member from the front side, so that the frame material and the stay are face-to-face with each other. The fixed structure is simple and easy to construct.

In the above configuration, the frame material is a plate-shaped member, and it is preferable that a folded portion is formed at the upper end portion of the central portion of the frame material in the left-right direction of the machine body.

According to this configuration, since the folded portion is present at the upper end portion of the central portion of the frame material in the left-right direction of the machine body, the folded portion effectively acts as a reinforcing rib. Therefore, since the strength of the frame material is also increased in terms of shape, the weight of the frame material can be further reduced.

It is a left side view which shows the whole of the walking type work machine. It is a front view which shows the whole of the walking type work machine. It is a left side view which shows the hilling equipment. It is a rear view which shows the hilling equipment. It is an exploded perspective view which shows the hilling equipment. FIG. 6 is a view taken along the line VI-VI in FIG. It is a VII-VII line arrow view in FIG. It is explanatory drawing which shows the operation state of the fixing mechanism. It is a rear view which shows the rope hook part for rope hooking. It is a left side surface which shows the hilling equipment in another embodiment. It is a rear view which shows the hilling apparatus in another embodiment. It is a left side view which shows the hilling apparatus in another embodiment. It is a rear view which shows the hilling apparatus in another embodiment.

Unless otherwise specified, the front-rear direction and the left-right direction in the embodiment of the present invention are described as follows. As shown in FIGS. 1 and 2, in a walking type work machine in which the steering handle is extended toward the rear side, the traveling direction of the forward side F during work traveling opposite to the extending direction of the steering handle is "forward". , And the traveling direction of the reverse side B is "rear". The direction corresponding to the right side R is "right" and the direction corresponding to the left side L is "left" with respect to the forward posture in the front-rear direction.

[Overall configuration of walking work machine]
As shown in FIGS. 1 and 2, the main body of the walking work machine has an engine 11 as a drive source mounted on an engine frame 10 that forms a part of the body frame 1. A mission case 12 constituting the airframe frame 1 is integrally connected to the rear side of the engine frame 10 together with the engine frame 10.
The engine 11 and the mission case 12 are interlocked and connected so as to be able to transmit power via the belt transmission mechanism 13.

The mission case 12 into which the power of the engine 11 is input is formed in a bifurcated shape including a front case 12A extending forward and downward and a rear case 12B extending rearward and downward. A traveling wheel 14 as a drive traveling device is supported on the lower portion of the front case 12A via an axle 14a, and a rotary tilling device 2 (corresponding to a tilling device) is supported on the rear case 12B via a drive shaft 20. There is.

A steering handle 16 is provided on the upper portion of the mission case 12 that also serves as the airframe frame 1 via a handle mounting base 15.
In the steering handle 16, the end portion on the connecting side to the handle mounting base 15 is pivotally connected by a horizontal axis having a horizontal axis x1. The end portion on the grip portion 16a side is attached so that the vertical position can be changed around the horizontal axis x1.
The vertical position of the steering handle 16 is changed by the angle adjusting mechanism 17 provided on the handle mounting base 15. The angle adjusting mechanism 17 includes an adjusting bracket 17a erected upward from the handle mounting base 15 and a locking portion 17b located near the base of the steering handle 16. By selectively engaging and disengaging the locking pins (not shown) on the locking portion 17b side with respect to the plurality of adjusting holes (not shown) formed in the adjusting bracket 17a, the horizontal axis It is configured so that the mounting angle of the steering handle 16 around x1 can be changed.

As shown in FIG. 9, the locking portion 17b has a tubular shape that is welded and fixed to a pair of front and rear plate-shaped connecting stays 16c that are connected to the left and right rod portions 16b and 16b near the base of the steering handle 16. A portion 17c is provided. The locking pin is supported on the tubular portion 17c so as to be retractable, and the locking pin protruding from the tubular portion 17c is selectively engaged with the adjusting hole of the adjusting bracket 17a, whereby the steering handle. The mounting angle of 16 can be adjusted in multiple stages.

As shown in FIG. 9, a pair of left and right rope hooks 16d are welded and fixed over the left and right side portions of the plate-shaped connecting stay 16c that connects the vicinity of the base of the steering handle 16 and the left and right rod portions 16b and 16b. ..
The rope hook 16d is formed in a C shape in the rear view with the central side open in the left-right direction. Therefore, when the walking work machine is transported by a transport vehicle, it is easy to hang a rope on the rope hook 16d and fix it on the loading platform.

The handle mounting base 15 is rotatably mounted around the vertical axis center y1 in the vertical direction with respect to the upper portion of the mission case 12. Therefore, when the handle mounting base 15 is rotated around the vertical axis center y1 and the direction is changed by 180 degrees from the rear extending state shown in FIG. 1, for example, the grip portion 16a of the steering handle 16 moves forward. It becomes a directed forward extension state. By changing the posture to the forward extending state and fixing the steering wheel 16 in this way, it is possible to grip the steering handle 16 from the front side and operate the vehicle.
When the posture of the steering handle 16 is changed to the forward extension state and the posture of the steering handle 16 is changed so that the steering handle 16 is closer to the upper side of the engine 11 by operating the angle adjusting mechanism 17, the entire walking type work machine is in a bulky state. Can be. This makes it possible to have a compact posture that is easy to handle during storage and transportation.

The main speed change lever 18 extends diagonally rearward and upward from the upper part of the transmission case 12, and by operating the main speed change lever 18, the speed change operation and forward / reverse operation of the traveling wheel 14 and the forward / reverse operation of the rotary tillage device 2 are performed. The reverse operation can be performed.
A pair of left and right traveling wheels 14 are provided, and the width W1 in the left-right direction is set narrower than the tilling work width W2 by the tilling claw 20a of the rotary tilling device 2 as shown in FIG. It is configured to be easy to drive.

[Rotary tillage device]
The rotary tillage device 2 will be described.
As shown in FIG. 1, the rotary tillage device 2 is arranged at a rear position of the traveling wheel 14 in the front-rear direction of the machine body, and is supported by the rear case 12B of the transmission case 12 via the drive shaft 20.

The rotary tillage device 2 is equipped with a tillage claw shaft 21, a rotary cover 22, a traveling assisting tool 3, and a rear cover 23.
The tillage claw shaft 21 is a drive shaft 20 supported by the rear case 12B of the mission case 12, in which a large number of nata-shaped tillage claws 20a are planted on the shaft portions protruding from the left and right sides of the mission case 12. be. The tilling claw shaft 21 has a well-known structure in which the tilling claw 20a cultivates the soil as the drive shaft 20 rotates.
The rotary cover 22 is provided so as to cover the upper half side of the tilling claw shaft 21 and limit the scattering of the mud that is flipped up with the rotation of the tilling claw shaft 21 upward and laterally.

The rotary tillage device 2 is equipped with a tillage claw shaft 21, a rotary cover 22, a traveling assisting tool 3, and a rear cover 23.
The rotary cover 22 includes an upper cover portion and lateral side plates provided at both left and right ends of the upper cover portion. The upper cover portion is divided into three parts in the left-right direction, and the upper cover portions on both the left and right sides of the upper cover portion located at the center are the left and right axial centers z1 in the front-rear direction as shown by virtual lines in FIG. , Z1 swings around, and the position can be fixed with the vertical position on the left and right end sides changed. The lateral plate portion is configured to be swingable and openable as shown in the figure around the front-rear axial center z2 and z2 provided at both ends in the left-right direction of the upper cover portion.

The tillage claw shaft 21 is a drive shaft 20 supported by the rear case 12B of the mission case 12, in which a large number of nata-shaped tillage claws 20a are planted on the shaft portions protruding from the left and right sides of the mission case 12. be. The tilling claw shaft 21 has a well-known structure in which the tilling claw 20a cultivates the soil as the drive shaft 20 rotates.
The rotary cover 22 is provided so as to cover the upper half side of the tilling claw shaft 21 and limit the scattering of the mud that is flipped up with the rotation of the tilling claw shaft 21 upward and laterally.

The traveling assisting tool 3 is located at the central portion in the left-right direction on the rear end side of the rotary cover 22. The traveling assisting tool 3 is attached to the rear frame 19 extending rearward from the rear case 12B of the mission case 12 so as to be vertically adjustable.
That is, a tubular support cylinder 19a is provided at the rear end of the rear frame 19, and a long round pipe-shaped support member 31 is inserted through the support cylinder 19a so that the vertical position can be adjusted. There is. Then, the position of the support member 31 in the support cylinder portion 19a can be set to the fixed or unfixed state by the fixing bolt 19b provided on the support cylinder portion 19a. As a result, the vertical height position of the traveling assisting tool 3 with respect to the rear frame 19 can be adjusted.

The rear cover 23 is composed of a plurality of rubber flexible plates hung downward from the lower portion on the rear end side of the rotary cover 22 and has a role of limiting the scattering of the cultivated soil to the rear side. ..
After that, as shown in FIGS. 1 and 2, in the usage posture, the rear cover 23 is used in a state of hanging backward and covering the rear side of the tillage claw shaft 21 as shown by a thin alternate long and short dash line. In the unused posture, the entire rear cover 23 is removed from the rear end portion of the rotary cover 22, or the lower end portion is folded upward as shown by the thick alternate long and short dash line in FIG.
When the soil cultivation work is performed using the soil cultivation device 4 described later, the rear cover 23 is removed from the rear end portion of the rotary cover 22 or the lower end portion is folded upward to be in an unused posture.

[Hilling equipment]
The hilling device 4 is attached to a traveling assisting tool 3 supported at the rear end of the rear frame 19.
The traveling assist tool 3 includes an auxiliary wheel 30 that can be grounded and rolled, and a support member 31 made of a long member extending in the vertical direction. The upper end side of the support member 31 is supported by the rear frame 19, and the support member 3 is provided. Auxiliary wheels 30 are provided on the lower end side of 31.
The soil cultivating device 4 is connected to the intermediate portion in the extending direction of the support member 31 and is located on the rear side of the rotary tilling device 2 so that the soil cultivated by the rotary tilling device 2 can be scraped up to the left and right ridges during the tilling work. The plate-shaped member 40 is provided.
The soil cultivation device 4 described here is a convenient name and can be used not only for soil cultivation work but also for medium cultivation work.

As shown in FIGS. 3 to 6, the training wheels 30 are supported by a mounting bracket 32 provided at the lower end of the support member 31, and are pivotally supported around a rotation axis x2 along the left-right direction. Has been done.
The mounting bracket 32 is provided with a horizontal piece 32a along the left-right direction which is welded and fixed to the lower end of the support member 31 at the upper portion, and a vertical piece along the vertical direction extending downward from one lateral side of the horizontal piece 32a. It is provided with 32b and is bent in an inverted L shape when viewed in the anteroposterior direction.
Around the rotation axis x 2 which is the axis of the support shaft 34 (corresponding to the axle of the training wheels 30) supported by the training wheels 32b in a state where the vertical piece 32b is located on the left lateral side of the training wheels 30. Therefore, the training wheels 30 are rotatably mounted.

The plate-shaped member 40 is made of a plate material having a certain degree of flexibility and elastically deformable, such as rubber or a synthetic resin material.
The left and right side edges 40b and 40b of the plate-shaped member 40 are formed in an upwardly expanding shape so that the upper side is located laterally outward with respect to the lower side. The overall shape of the plate-shaped member 40 is formed in an inverted trapezoidal shape in which the length of the upper end edge 40a in the left-right direction is longer than that of the lower end edge 40c in the front-rear direction.

As shown in FIG. 5, a notch 40d extending in the vertical direction is formed in the lower portion of the central portion in the left-right direction on the lower end edge 40c side of the plate-shaped member 40. As shown in FIGS. 4 and 5, a reinforcing member 41 having a higher rigidity than the plate-shaped member 40 is mounted on the peripheral edge of the notch 40d along the notch 40d.
In the reinforcing member 41, when the plate-shaped member 40 pushed by the mud tries to be displaced to the rear side during the tilling work, the support member 31 located at the rear abuts from the rear side, and the notch portion 40d This is for limiting the amount of rearward deformation of the plate-shaped member 40 in the vicinity of the portion where the plate-shaped member 40 is provided.

That is, the reinforcing member 41 includes a rear protruding horizontal piece 41b along the vertical direction at the peripheral lateral side position of the notch portion 41d of the reinforcing member 41 itself and a rear protruding upper piece 41a along the left and right direction at the upper position of the notch portion 41d. And the rear protruding upper end piece 41c along the left-right direction at the upper end position of the reinforcing member 41.
Then, as shown in FIGS. 4 and 6, the rear protruding upper piece 41a abuts on the horizontal piece 32a of the mounting bracket 32 provided at the lower end of the support member 31, and the rear protruding horizontal piece 41b is attached to the mounting bracket 32. It is possible to abut the vertical piece 32b to suppress the displacement of the reinforcing member 41 to the rear side and limit the amount of deformation of the plate-shaped member 40 to the rear side.
The rear protruding upper end piece 41c, together with the rear protruding upper piece 41a, functions as a rib member for suppressing deformation of the reinforcing member 41 itself. As a result, when an external force is applied from the front to the rear on the left-right end side of the plate-shaped member 40, the central portion of the plate-shaped member 40 in the left-right direction and the reinforcing member 41 are laterally outward in the left-right direction. It is possible to limit the degree of bending and deformation so that it recedes toward the side.

Further, as shown in FIGS. 4 and 6, the position of the lower end portion of the reinforcing member 41 in the vertical direction coincides with or substantially coincides with the position of the part of the training wheels 30 that comes into contact with the field during the tilling work. The lower end of the plate-shaped member 40 projects downward from the lower end of the reinforcing member 41.
Therefore, when the training work is carried out with the training wheels 30 grounded, the lower end portion of the plate-shaped member 40 protruding downward from the lower end portion of the reinforcing member 41 bends to the rear side, as shown by a virtual line in FIG. It is easy to prevent the plate-shaped member 40 from further settling by touching the ground in the state of being grounded.

The left-right width of the notch 40d of the plate-shaped member 40 and the notch 41d of the reinforcing member 41 is formed to be wider than the left-right width of the training wheels 30. By attaching the training wheels 30 and the plate-shaped member 40 to the notches 40d and 41d in a state where the training wheels 30 are inserted into the portions in front of the support shaft 34 of the training wheels 30, as shown in FIGS. The plate-shaped member 40 is provided in a state of overlapping with the training wheels 30.
In this way, the position of the lower end portion of the plate-shaped member 40 in the front-rear direction of the machine body is the position in the front-rear direction of the machine body of the training wheels 30 where the lower end portion of the plate-shaped member 40 comes into contact with the field during the tilling work. It is configured to match or substantially match with.

A metal plate frame material 42 extending in the left-right direction of the machine body is attached to the upper end portion of the plate-shaped member 40 along the upper end edge 40a. The frame member 42 has a higher rigidity than the plate-shaped member 40, and acts as a reinforcing member attached to the left and right sides of the plate-shaped member 40 and to face the surface of the plate-shaped member 40. Since the frame member 42 acting as the reinforcing member is attached to the upper end portion of the plate-shaped member 40, the elastically deformable range of the plate-shaped member 40 is limited. The plate-shaped member 40 is connected to the traveling assisting tool 3 via the frame member 42 at the upper end thereof.
The traveling assisting tool 3 to which the plate-shaped member 40 is connected is inserted through the support cylinder portion 19a provided at the rear end portion of the rear frame 19, and the lower end side is extended downward. The support member 31 is provided with a stay 3A extending in the left-right direction of the machine body as a mounting portion for mounting the plate-shaped member 40.

The stay 3A is a fixed stay 35 welded and fixed to the support member 31 at an intermediate portion in the extending direction of the support member 31 extending downward, and an intermediate portion detachably attached to the fixed stay 35. The stay 36 and the stay 36 are provided.
The fixed stay 35 and the intermediate stay 36 are connected and fixed by inserting a connecting bolt 36a fixed to the intermediate stay 36 side into a connecting hole 35a provided on the fixed stay 35 side and tightening with bolts and nuts.
The frame member 42 of the plate-shaped member 40 is connected to the stay 3A by a fixing mechanism 5 described later in a state of being face-to-face with each other in the front-rear direction of the machine body.

[Fixing mechanism]
The fixing mechanism 5 includes a first locking portion 50 provided on the stay 3A having a function as a mounting portion supported on the machine body side, and a second locking portion 51 provided on the frame member 42 of the plate-shaped member 40. , Is equipped.
The first locking portion 50 is formed so as to penetrate the intermediate stay 36, which is detachably connected to the fixed stay 35, in the stay 3A in the thickness direction of the plate-shaped member 40. Dharma hole 52 (corresponding to a hole). The second locking portion 51 is a headed pin 53 (corresponding to a protruding member) that protrudes along the thickness direction of the plate-shaped member 40 so as to be able to engage and disengage from the Dharma hole 52.

The first locking portion 50 and the second locking portion 51 are engaged and disengaged as follows.
As shown in FIGS. 7 and 8, the head portion 53a of the headed pin 53 is inserted into the large diameter hole portion 52a of the Dharma hole 52 in a state where the frame material 42 is face-to-face with the front portion of the intermediate stay 36 from the front side. (See FIG. 8 (a)).
From this state, as shown in FIG. 8B, the frame material 42 is slid to the right lateral direction in the drawing, and the shaft portion 53b of the headed pin 53 is positioned in the small diameter hole portion 52b of the Dharma hole 52. Let me. The state in which the shaft portion 53b of the headed pin 53 is positioned at the innermost portion in the small diameter hole portion 52b is the state in which the plate-shaped member 40 is positioned at the position used for tillage work. At this use position, relative movement in the front-rear direction of the machine body is restricted in a state where the headed pin 53 of the second locking portion 51 is engaged with the Dharma hole 52 of the first locking portion 50.
On the contrary, when the frame material 42 is slid to the left lateral direction in the drawing to position the head portion 53a of the headed pin 53 in the large diameter hole portion 52a of the Dharma hole 52, the headed pin 53 is moved to the Dharma hole 52. Can be extracted from.

The fixing mechanism 5 second locks the Dharma hole 52, which is the first locking portion 50, with respect to the small diameter hole portion 52b so that the Dharma hole 52 and the headed pin 53 are locked at the used position. A guide mechanism 5A for guiding the shaft portion 53b of the headed pin 53, which is a portion 51, and a lock mechanism 5B for holding the plate-shaped member 40 at the used position are provided.

[Guide mechanism]
The guide mechanism 5A is composed of the shape of the Dharma hole 52 itself and the shaft portion 53b of the headed pin 53.
That is, of the Dharma holes 52, the large-diameter hole portion 52a allows the head portion 53a of the headed pin 53 to be inserted, and the shaft portion 53b located in the large-diameter hole portion 52a is shifted to the small-diameter hole portion 52b side. I will give you guidance. Then, the small-diameter hole portion 52b itself guides the shaft portion 53b until it reaches the innermost portion of the small-diameter hole portion 52b.

More specifically, the headed pin 53 includes a head portion 53a projecting outward in the radial direction with respect to the shaft portion 53b. The head portion 53a has a smaller diameter than the large-diameter hole portion 52a of the Dharma hole 52 and a larger diameter than the small-diameter hole portion 52b, and the shaft portion 53b has a diameter that allows entry into the small-diameter hole portion 52b. There is. The head portion 53a is provided at a position separated from the base end portion of the shaft portion 53b by a predetermined distance. The predetermined distance from the base end portion of the shaft portion 53b to the head portion 53a is a distance corresponding to the thickness of the peripheral portion of the intermediate stay 36, which is the mounting portion forming the Dharma hole 52, in the outer peripheral portion of the Dharma hole 52. Is.

The Dharma hole 52 has a hole diameter along the length direction of the intermediate stay 36, which is the hole diameter of the large-diameter hole portion 52a plus the same-direction length of the long-hole-shaped small-diameter hole portion 52b. The maximum diameter of the Dharma holes 52 along the width direction of the intermediate stay 36 is the same as the hole diameter of the large-diameter hole portion 52a. That is, the Dharma hole 52 is formed so that the hole diameter along the length direction of the intermediate stay 36 is larger than the hole diameter along the width direction of the intermediate stay 36.
The Dharma hole 52 formed in this way is provided along the major axis direction in the length direction of the intermediate stay 36 along the left-right direction of the machine body, and is a linear small-diameter hole portion 52b at a lateral position of the large-diameter hole portion 52a. Is provided. In the linear elongated hole formed by the small diameter hole portion 52b, there is a position to be used for positioning the shaft portion 53b at one end portion thereof, and the shaft portion 53b and the head portion 53a of the headed pin 53 can be inserted into the other end portion. There is a large-diameter hole portion 52a as an engagement portion.

[Lock mechanism]
The lock mechanism 5B includes a first lock member 54 attached to the frame member 42 of the plate-shaped member 40, and a second lock member 55 provided on the intermediate stay 36 of the stay 3A.
The first lock member 54 is an L-shaped plate member that is pivotally connected to the frame member 42 using a support shaft 54a and is provided so as to be able to change its posture by rotating around the axis of the support shaft 54a. , A contact surface 54b is provided on one side.
The second lock member 55 is also used by the intermediate stay 36, and includes a contact surface 55a formed by an end portion of the intermediate stay 36 in the length direction on the side where the first lock member 54 exists. There is.

In this lock mechanism 5B, as shown in FIG. 8A, the first lock member 54 is placed in an unlocked posture in which the contact surface 54b is separated from the contact surface 55a of the second lock member 55, and the intermediate stay is set. A headed pin 53 is inserted through the Dharma hole 52 of 36.
From this state, as shown in FIG. 8B, the first lock member 54 is rotated counterclockwise in the drawing, and the contact surface 54b of the first lock member 54 comes into contact with the second lock member 55. When operated in the locked state in contact with the surface 55a, the shaft portion 53b of the headed pin 53 located in the Dharma hole 52 of the intermediate stay 36 is switched to the state where the shaft portion 53b of the headed pin 53 is moved to the innermost used position of the small diameter hole portion 52b. Be done.
That is, the first locking member 54 acts on the second locking member 55 in the same direction as the guide mechanism 5A, so that the Dharma hole 52 as the first locking portion 50 and the second locking portion It is in a locked state that holds the locking of the headed pin 53 as the 51.

[Soil gathering member]
As shown in FIGS. 4, 5 and 7, the plate-shaped member 40 projects from the left and right sides of the plate-shaped member 40 to the left and right sides corresponding to the upper parts of the left and right sides of the plate-shaped member 40. Left and right soil gathering members 6 that can assist in scraping are provided.
The earth gathering member 6 is made of an elastically deformable material such as a relatively hard rubber or a synthetic resin material having a hardness equal to or higher than that of the plate-shaped member 40.

The earth gathering member 6 is formed in a flat plate shape, and in a state of facing the plate-shaped member 40, the plate-shaped member 40 is provided via a fastener 60 provided over the plate-shaped member 40 and the frame member 42 facing the plate-shaped member 40. Is supported by.
The fastener 60 includes an elongated support hole 61, a connecting bolt 62 as a shaft member that can be inserted into the support hole 61, and a bag nut 63 that is screwed into the threaded portion of the connecting bolt 62.
The connecting bolt 62 has an axial center in a direction intersecting the surface of the plate-shaped member 40 over the vicinity of both left and right side portions of the plate-shaped member 40 and near both ends of the frame member 42 in the left-right direction facing the plate-shaped member 40. It is provided so that it can be tightened in the thickness direction of the plate-shaped member 40.
The threaded portion of the connecting bolt 62 is directed from the front side to the rear side, and a bag nut 63 having a large grip is screwed into this threaded portion from the rear side, and the connecting bolt 62 is tightened by rotating the bag nut 63. It is configured so that it can be switched between and in a relaxed state.

By loosening the connecting bolt 62, the soil gathering member 6 provided in this way is rotatably supported around the axis of the connecting bolt 62, and changes the posture with respect to the plate-shaped member 40 around the axis of the connecting bolt 62. be able to. Then, by tightening the connecting bolt 62, the posture changed by the rotation operation can be maintained.
Further, since the support hole 61 has a long hole shape, the soil gathering member 6 can be slid and moved by the length of the support hole 61.

As a result, as shown by virtual lines in FIGS. 4 and 7, the soil gathering member 6 is in a state of protruding laterally outward from both left and right ends of the plate-shaped member 40, or in a state of protruding upward. The protruding state with respect to the shape member 40 can be changed. At this time, as shown in FIGS. 4 and 7, the soil gathering member 6 is sandwiched between the plate-shaped member 40 and the frame member 42. Therefore, it is easier to maintain the holding posture of the soil gathering member 6 by the plate-shaped member 40 in a stronger state than when it is simply attached to one side of the plate-shaped member 40 or the frame member 42 without using such a holding structure. ..

Further, as shown by solid lines in FIGS. 4 and 7, the state of the soil gathering member 6 can be changed to a retired state in which the soil gathering member 6 does not project laterally outward from both left and right ends of the plate-shaped member 40. In this retired state, since the earth gathering member 6 is positioned and sandwiched between the plate-shaped member 40 and the frame member 42, an external force due to earth pressure or the like from the front-back direction or the up-down direction is directly applied to the earth gathering member 6. There is no risk of acting as a target. Further, if the state is changed to such a retired state, the soil cultivation device 4 can be easily stored compactly when not in use.

As described above, the soil gathering member 6 is not limited to the case where the soil gathering member 6 is in a retracted state in which the plate-shaped member 40 does not project laterally outward from the left and right ends of the plate-shaped member 40. Even when the soil gathering member 6 is stored in a slightly protruding state, it is advantageous in terms of strength if the soil gathering member 6 is positioned and sandwiched between the plate-shaped member 40 and the frame member 42.
That is, when the soil gathering member 6 is positioned and sandwiched between the plate-shaped member 40 and the frame material 42, even if an external force in the front-rear direction due to earth pressure or the like acts on the protruding portion of the soil gathering member 6, the soil gathering member 6 is held. It is easy to suppress the change in posture of the member 6 as much as possible at the sandwiched portion between the plate-shaped member 40 and the frame material 42, and to firmly maintain the state of attachment to the plate-shaped member 40 and the frame material 42.

[1 of another embodiment]
In the embodiment, as the traveling assist tool 3, a structure having a support member 31 supported by the rear frame 19 and training wheels 30 provided on the lower end side of the support member 31 has been exemplified, but this is not necessarily the case. It is not limited to the structure.
For example, as shown in FIGS. 10 and 11, the traveling assist tool 3 includes a sled-shaped ground contact body 30A and a long support member 31 supported at the rear end of the rear frame 19. May be good. The sled-shaped ground contact body 30A has a ground contact surface that is wider in the left-right direction than the support member 31.
Even in this structure, the plate so that the position of the lower end portion of the plate-shaped member 40 in the front-rear direction of the machine body coincides with or substantially matches the position of the portion of the ground contact body 30A that touches the field in the front-rear direction of the machine body. The shape member 40 and the reinforcing member 41 are provided with notches 40d and 41d on the lower end side of the support member 31 and into which the wedge-shaped grounding body 30A enters.
For other configurations, the same configurations as those in the above-described embodiment may be adopted.

[2 of another embodiment]
In the embodiment, as the traveling assist tool 3, a structure having a support member 31 supported by the rear frame 19 and training wheels 30 provided on the lower end side of the support member 31 has been exemplified, but this is not necessarily the case. It is not limited to the structure.
For example, as shown in FIGS. 12 and 13, as the traveling assist tool 3, a resistance portion 30B that touches the field at a plurality of locations in the left-right direction of the machine body and a round pipe-shaped support connected to the upper side of the resistance portion 30B. A resistance rod provided with the member 31 may be used.
In this case, the resistance portion 30B provided on the lower end side of the resistance rod is bifurcated as shown in FIG. 13, and the lower end portion of the branched resistance portion 30B is bent toward the rear of the machine body.
Further, also in this structure, the position of the lower end portion of the plate-shaped member 40 in the front-rear direction of the machine body coincides with or substantially coincides with the position of the portion of the resistance portion 30B that touches the field in the front-rear direction of the machine body. The plate-shaped member 40 and the reinforcing member 41 are provided with notches 40d and 41d into which the bifurcated resistance portion 30B enters.
The resistance portion 30B is not limited to the structure branched in a bifurcated shape as described above, and may have a structure in which the lower end side is branched into three or more bifurcations and includes a plurality of resistance portions 30B. Further, the structure is not limited to a structure in which the lower end side is branched to include a plurality of resistance portions 30B, and a structure in which a plurality of resistance rods having a single resistance portion 30B are provided may be provided. good.
Furthermore, the resistance portion 30B is not necessarily provided at the central portion in the left-right direction, and may be provided at a plurality of locations deviated from the central portion in the left-right direction.
For other configurations, the same configurations as those in the above-described embodiment may be adopted.

[3 of another embodiment]
In the embodiment, when the frame material 42 and the stay 3A are connected, the structure in which the frame material 42 is face-to-face with the front surface portion of the stay 3A from the front side is illustrated, but the structure is not necessarily limited to this structure.
For example, the frame material 42 may have a structure in which the frame material 42 is face-to-face with the rear surface portion of the stay 3A from the rear side.
Further, the structure of the connecting portion between the frame material 42 and the stay 3A is not limited to a structure in which the flat surfaces are simply fixed in a face-to-face state, and for example, an L-shaped cross section or a face-to-face structure with a channel-shaped cross section is adopted. You may.
For other configurations, the same configurations as those in the above-described embodiment may be adopted.

[4 of another embodiment]
In the embodiment, a structure in which a pair of left and right traveling wheels 14 is adopted as the driving traveling device is illustrated, but the structure is not necessarily limited to this structure.
For example, the traveling wheel 14 may be a one-wheel type that employs a single traveling wheel 14. In short, it suffices to use a drive traveling device configured to be narrower than the tillage width of the rotary tillage device 2.
For other configurations, the same configurations as those in the above-described embodiment may be adopted.

[5 of another embodiment]
In the embodiment, a structure in which a driven traveling wheel 14 is adopted as the driving traveling device has been exemplified, but the structure is not necessarily limited to this structure.
For example, the drive traveling device may be composed of crawlers as well as wheels. Further, the rotary tillage device 2 is used as a drive travel device by utilizing the drive rotation of the tillage claw 20a in the rotary tillage device 2 as the propulsive force of the main body of the machine body, not limited to the structure provided with a dedicated drive travel device. It may have a structure that is also used.
For other configurations, the same configurations as those in the above-described embodiment may be adopted.

[6 of another embodiment]
In the embodiment, the auxiliary wheel 30 has a structure composed of one wheel, but the structure is not necessarily limited to this structure.
For example, the structure is not limited to one wheel, and may be a structure composed of two or more wheels. Further, the training wheels 30 are not limited to those provided at the central portion in the left-right direction, and may be provided at a plurality of locations deviated from the central portion in the left-right direction.
For other configurations, the same configurations as those in the above-described embodiment may be adopted.

[7 of another embodiment]
In the embodiment, the plate-shaped member 40 of the hilling device 4 is exemplified by a single member having an integral structure as a whole, but the structure is not necessarily limited to this.
For example, the plate-shaped member 40 is composed of a plurality of divided plate materials divided at one place or a plurality of places in the left-right direction, and the upper ends of the plurality of divided plate materials are connected to each other by a frame material 42. , One plate-shaped member 40 may be formed.
For other configurations, the same configurations as those in the above-described embodiment may be adopted.

[8 of another embodiment]
In the embodiment, a structure in which the reinforcing member 41 in a state along the cutout portion 40d of the plate-shaped member 40 and the frame member 42 for reinforcing the upper end portion of the plate-shaped member 40 are made of separate members is exemplified. However, the structure is not necessarily limited to this, and both may be composed of an integral member.
In this case, the rear protruding upper end piece 41c along the left-right direction at the upper end position of the reinforcing member 41 corresponds to the folded-back portion formed at the upper end portion of the center portion of the frame material 42 in the left-right direction. The rear projecting upper end piece 41c, together with the rear projecting upper piece 41a, functions as a rib member for suppressing deformation in the central portion of the reinforcing member 41 and the frame member 42 itself.
For other configurations, the same configurations as those in the above-described embodiment may be adopted.

[9 of another embodiment]
In the embodiment, a structure in which the stay 3A for attaching the plate-shaped member 40 to the support member 31 is composed of separate members of the fixed stay 35 and the intermediate stay 36 has been illustrated, but the structure is not necessarily limited to this structure. do not have.
For example, the intermediate stay 36 may be integrally configured with the fixed stay 35. Further, an appropriate structure can be adopted for the shape of the fixed stay 35 and the intermediate stay 36, a specific connecting structure, and the like.
For other configurations, the same configurations as those in the above-described embodiment may be adopted.

[10 of another embodiment]
In the embodiment, a structure in which the plate-shaped member 40 is provided so as to be located in front of the support shaft 34, which is the axle of the training wheels 30, has been exemplified, but the structure is not necessarily limited to this structure. ..
For example, the plate-shaped member 40 may have a structure provided so as to be located on the rear side of the support shaft 34.
For other configurations, the same configurations as those in the above-described embodiment may be adopted.

[11 of another embodiment]
In the embodiment, the intermediate stay 36 on the stay 3A side is provided with the first locking portion 50 by the Dharma hole 52, and the frame material 42 on the plate-shaped member 40 side is provided with the second locking portion 51 by the headed pin 53. Although the above-mentioned structure is illustrated, the structure is not necessarily limited to this structure.
For example, the side on which the first locking portion 50 is provided and the side on which the second locking portion 51 is provided may be reversed.
For other configurations, the same configurations as those in the above-described embodiment may be adopted.

[12 of another embodiment]
In the embodiment, the earth gathering member 6 has a structure in which the connecting bolt 62 is inserted into the elongated support hole 61 so as to be slidable and rotatable, but the structure is not necessarily limited to this structure. It's not something.
For example, a round hole is formed in the soil gathering member 6 and a connecting bolt 62 is inserted through the round hole to allow rotation only, or a plurality of elongated support holes 61 are formed in the soil gathering member 6. Therefore, an appropriate structure can be adopted, such as making it possible to fix it with a plurality of connecting bolts 62 so that it can be slidably moved.
For other configurations, the same configurations as those in the above-described embodiment may be adopted.

The present invention can be applied to various walk-behind work machines that perform medium cultivation work and soil cultivation work.

2 Tillage device 3 Traveling aid 3A Stay 4 Soil cultivation device 5 Fixing mechanism 14 Drive traveling device 16 Steering handle 30 Training wheels 31 Supporting member
40 Plate-shaped member 41 Reinforcing member 41c Folded part 42 Frame material

Claims (6)

It is a walking type work machine equipped with a drive traveling device and capable of tilling work in the furrows.
The main body of the aircraft, which is connected to the steering wheel and operated by the operator,
A tilling device supported at the rear of the main body of the machine,
A traveling assisting tool that is supported by the machine body via a support member while being located behind the tilling device and touches the field during the tilling work to assist the running posture of the machine body.
A plate-shaped member provided behind the tilling device and capable of scraping up the soil cultivated by the tilling device into the left and right ridges while elastically deforming the soil during the tilling work is provided.
The plate-shaped member is supported by the support member and is supported by the support member .
The reinforcing member, which has higher rigidity than the plate-shaped member and which abuts on the support member when the plate-shaped member tries to displace backward, regulates the rearward deformation of the plate-shaped member. A walking type work machine provided on a plate-shaped member. The walking type work machine according to claim 1, wherein the support member is supported on the main body of the machine body in a state where the height position can be adjusted. The support member is a long member extending vertically and vertically.
A stay extending in the left-right direction of the machine body is supported at the intermediate portion in the extending direction of the support member.
The walking-type working machine according to claim 1 or 2, wherein the upper end portion of the plate-shaped member is supported on the stay. A frame material extending in the left-right direction of the machine body is attached to the upper end of the plate-shaped member.
The walking type working machine according to claim 3, wherein the frame material and the stay are connected by a fixing mechanism in a state where the frame material and the stay are face-to-face in the front-rear direction of the machine body. The walking-type working machine according to claim 4, wherein the frame material is connected to the stay in a state where the frame material is face-to-face with the front surface portion of the stay from the front side. The frame material is a plate-shaped member and
The walking type working machine according to claim 4 or 5, wherein a folded portion is formed at an upper end portion of a central portion of the frame material in the left-right direction of the machine body.

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