JP2005130824A - Farm working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary tiller that does not take an unuse posture even when an arm-extendible leveling part is thrust up by the pushing power from the soil. <P>SOLUTION: This farm working machine is equipped with the leveling part 14b for leveling farm fields and an arm-extending leveling part 27 that extends from the leveling part 14b outward in both left and right directions in which the extending leveling part 27 is made freely convertible from the extended posture where the extending leveling part 27 extends from the leveling part 14b toward both left and right sides to the unuse posture at the position of the upper side of the leveling part 14b. In this case, an energizing means 34 is attached so that the means 34 may always energizes the arm-extending leveling part 27 in the direction from the unuse posture to the extending posture and a cable 39 for remote controlling the arm-extending leveling part 27 for converting from the extended posture to the unuse posture and a cable holder 52 for regulating the movement of a cable 39 to hold the arm-extending leveling part 27 at its folded position are provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a working machine having a leveling function such as a rotary tiller.

Conventionally, there is a rotary cultivator as a working machine having a leveling function, and the rotary cultivator is mounted on a rear part of a tractor through a three-point link mechanism so as to be movable up and down, and in a horizontal direction at a lower part of the machine frame. The rotary tiller part which attaches many tilling claws to the nail | claw axis | shaft provided rotatably around the shaft center of this, and the tillage cover which covers this rotary tillage part are provided.
The said tilling cover is provided with the main cover which covers the upper part of a rotary tilling part, and the rear part cover which covers the back of a rotary tilling part, The leveling part which levels a farm field is provided in the lower end side of a rear cover.

The tillage cover includes an extended leveling portion that protrudes outward in the left-right direction from the leveling portion of the rear cover, and the extended leveling portion is superimposed above the leveling portion from an extended posture that protrudes outward in the left-right direction from the leveling portion. Some of the rotary cultivators of this type have a tension coil spring that extends between the extended leveling part and the leveling part. In the extended posture, the tension coil spring urges the extended leveling portion in a direction to rotate from the non-use posture side to the extended posture side, and in the non-use posture, the extension leveling portion is moved from the extended posture side. It is provided so that the urging force can be switched so as to urge in the direction of turning to the non-use posture side, and thereby the extended leveling part can be held in the extended posture and the non-use posture. That (see Patent Document 1).
JP-A-5-207801 Japanese Utility Model Publication No. 62-19125 Japanese Utility Model Publication No. 60-18001

In the conventional rotary cultivator, the extended leveling portion is configured to be held in the extended posture and the non-use posture by switching the urging force of the tension coil spring. There is a risk that the leveling part will be pushed up by the pressing force from the soil and turn into a non-use posture.
Then, in view of the said problem, this invention aims at providing the working machine which does not become a non-use posture even if an extended leveling part pushes up by the pressing force from soil and rotates.

The technical means taken by the present invention to achieve the above object includes a leveling part for leveling a field and an extension leveling part extending outward in the left-right direction from the leveling part. In the working machine that is rotatable so that the posture can be changed from an extended posture extending outward in the left-right direction from the portion to a non-use posture located on the upper side of the leveling unit,
An urging means for constantly urging the extended leveling portion in a direction to rotate from the non-use posture to the extended posture; a cable for remotely operating the extended leveling portion to change the posture from the extended posture to the non-use posture; And holding means for restricting the movement of the cable and holding the extended leveling portion in the folded position.

  Further, the pushing member provided on one end side of the cable is brought into contact with the cable engaging portion provided on the extended leveling portion side, and the other end side of the cable is pulled to rotate the extended leveling portion to the non-use posture. The push member and the cable engaging portion are configured so as to be separated from each other so that they are separated when the extended leveling portion is rotated to the non-use posture side by an external force from the ground surface side. It is good. Further, a leveling portion is provided on the lower end side of the rear cover that covers the rear of the rotary tillage portion. It is preferable that the extended leveling part is supported by the closing cover.

In addition, it is preferable to provide a cable guide for guiding the cable so that the extended leveling portion is reversed around the rotation center so that the extended leveling portion is superposed on the upper side of the leveling portion from the extended posture.
In addition, a rotation member that is rotatable around the rotation center of the extended leveling portion is provided, and one end side of the cable is connected to the rotation member and contacts a cable engaging portion provided on the extended leveling portion side. By including a pushing member and a cable guide for guiding the cable around the turning center of the extended leveling portion, by pulling the cable and turning the turning member to press the cable engaging portion by the pushing member, The extended leveling portion may be configured to rotate from the extended posture to the non-use posture.

  The urging means is constituted by a torsion coil spring, and the torsion coil spring is preferably fitted onto a support shaft that is the center of rotation of the extended leveling portion.

According to the present invention, since the extended leveling portion is provided with the biasing means that constantly biases the extended leveling portion in the direction of rotating from the non-use posture to the extended posture, the extended leveling portion is pushed up by the pressing force from the soil and rotated. Even if it does not become a non-use posture.
In addition, the working machine includes a cable that is remotely operated to change the posture from the extended posture to the non-use posture, and a holding unit that restricts the movement of the cable and holds the extended leveling portion in the folded position. However, for example, if it is attached to the rear of the tractor, the operator can change the posture of the extended leveling unit by remote control between the extended posture and the non-use posture while riding on the driver's seat of the tractor. .

Further, the pushing member provided on one end side of the cable is brought into contact with the cable engaging portion provided on the extended leveling portion side, and the other end side of the cable is pulled to rotate the extended leveling portion to the non-use posture. The push member and the cable engaging portion are configured so as to be separated from each other so that they are separated when the extended leveling portion rotates to the non-use posture side by an external force from the ground surface side. Thus, even if the extended leveling portion is pressed and rotated by an external force from the ground side, the cable is not pushed and pulled, and damage to the cable can be prevented.
Further, a leveling portion is provided on the lower end side of the rear cover that covers the rear of the rotary tillage portion, and a notch portion is formed on the side portion on the lower end side of the rear cover and a closing cover that closes the notch portion is provided. It is provided detachably, and by supporting the extended leveling portion on this closing cover, the extended leveling portion can be removed together when removing the closing cover, which is convenient.

Further, by providing the cable guide for guiding the cable, the posture can be changed to the non-use posture reversed around the rotation center so that the extended leveling portion is superimposed on the upper side of the leveling portion from the extended posture.
In addition, a rotation member that is rotatable around the rotation center of the extended leveling portion is provided, and one end side of the cable is connected to the rotation member and contacts a cable engaging portion provided on the extended leveling portion side. By including a pushing member and a cable guide for guiding the cable around the turning center of the extended leveling portion, by pulling the cable and turning the turning member to press the cable engaging portion by the pushing member, By configuring the extended leveling part to rotate from the extended position to the non-use position, it is possible to prevent the cable from being damaged, and the extended leveling part is superimposed on the upper side of the leveling part from the extended position. The posture can be changed to a non-use posture reversed around the rotation center.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 2, 1 is a rotary tiller (working machine) that is mounted on the rear part of the tractor via a three-point link mechanism so as to be movable up and down.
The rotary cultivator 1 has support arms 2 protruding left and right from a central gear case, and fixes the upper part of the transmission case 3 to the left and right outer ends of one support arm 2, while A machine frame 4 is mainly configured in a gate shape with the upper part of the side frame fixed to the outer end side in the direction.

A top mast 5 is fixed to the gear case of the machine frame 4 so as to protrude upward. A top link mounting bracket 6 is provided on the top mast 5, and the rear end side of the top link is located on the front end side of the top link mounting bracket 6. Connected.
Further, a lower link mounting bracket 7 is fixed to each of the left and right support arms 2 of the machine frame 4, and a rear end side of the lower link is connected to a front end side of the lower link mounting bracket 7 via a connecting pin.
Further, at the lower part of the machine casing 4, there are a claw shaft 8 that is supported between the lower part of the transmission case 3 and the side frame so as to be rotatable around the axis in the left-right direction, and a number of attachments attached to the claw shaft 8. A rotary tiller 10 having a tillage claw 9 is provided.

The power input from the PTO shaft of the tractor to the gear case via the PIC shaft 11 is transmitted to the claw shaft 8 through the power transmission mechanism in the gear case, the transmission shaft in the support arm 2, and the power transmission mechanism in the transmission case 3. When transmitted, the claw shaft 8 is configured to be rotationally driven in the direction of arrow A, for example.
Further, a tilling cover 12 that covers the rotary tilling unit 10 is supported on the machine frame 4.
The tillage cover 12 includes a main cover 13 that covers the upper side of the rotary tiller 10, a rear cover 14 that covers the rear side of the rotary tiller 10, and a pair of front and rear sides that covers both the left and right sides of the upper portion of the rotary tiller 10. Covers 15F and 15R are provided.

The rear cover 14 is supported at its upper end on the rear end side of the main cover 13 via a support shaft 16 so as to be rotatable about a horizontal axis.
Further, a lowering rod 17 is provided across the rear upper surface side of the main cover 13 and the upper and lower middle portion of the rear side of the rear cover 14, and by a coil spring for lowering that is fitted onto the lowering rod 17, The rear cover 14 is configured to be biased toward the rotary tillage unit 10 side.
The rear cover 14 has a main part 14a that covers the rear of the rotary tiller 10, and a leveling part 14b that is located on the lower end side of the rear cover 14 and that contacts the farm and levels the farm.

  As shown in FIG. 3, in this embodiment, the left and right sides on the lower end side of the rear cover 14 are cut from the left and right sides on the lower end side of the main portion 14a to the left and right end sides of the leveling portion 14b. An open cutout 18 is provided on the outer side and the lower side in the left and right direction, and a detachable closing cover 19 for closing the cutout 18 is provided. In this embodiment, a rear cover is provided. 14 is composed of a main body side having a notch 18 and a closing cover 19, which is a part of the lower end side left and right outer end side of the main portion 14 a of the rear cover 14 and a leveling portion. It constitutes a part of the left and right outer end side of 14b.

The closing cover 19 is removed when attaching a double earthenware etc. to the rotary tiller 1.
Further, the closing cover 19 may be integrally formed with the main body side of the rear cover 14.
An insertion member 20 made of a pipe material or the like is provided in the left-right direction on the back side of the lower end portion of each of the left and right closing covers 19, and the inner side in the left-right direction of the insertion member 20 is formed with a small diameter and is connected to the insertion portion 20 a. And protrudes inward in the left-right direction from the closing cover 19.
On the other hand, as shown in FIG. 9 (a), the lower end side of the leveling portion 14b on the main body side of the rear cover 14 is folded back in an arc shape and the end portion is overlapped and fixed on the back side. Inserted members 22 made of a cylindrical member into which the insertion portion 20 a of the insertion member 20 of the closing cover 19 is inserted are inserted and fixed on the left and right sides of the closure cover 19.

Further, as shown in FIGS. 3 and 9B, a bracket 23 is fixed to the upper rear portion of the closing cover 19, and a lever 24 is attached to the bracket 23 so as to be rotatable around a horizontal axis. The lever 24 is provided with a hooking member 26 made of a spring material that is hooked on a hook member 25 provided on the main body side of the rear cover 14.
In the case of the above configuration, the insertion portion 20a is inserted into the insertion member 22, and then the hook member 26 is hooked on the hook member 25 with the lever 24 raised, and then the lever 24 is tilted to close it. A cover 19 is detachably attached to the main body side of the rear cover 14.

As shown in FIGS. 1 to 7, on both the left and right sides of the lower end side of the rear cover 14, extended leveling portions 27 that protrude outward from the leveling portion 14 b in the left-right direction and level the field together with the leveling portion 14 b are provided. Yes.
As shown in FIG. 6 (a), the extended leveling portion 27 extends from the leveling portion 14b to the outer side in the left-right direction, and from this extended posture to the upper side of the leveling portion 14b as shown in FIG. 6 (b). The posture can be changed (openable and closable) to a non-use posture positioned so as to be superimposed on each other.
In the present embodiment, an extended leveling portion 27 is attached to the closing cover 19, and the extended leveling portion 27 is removed together with the closing cover 19 from the main body side of the rear cover 14.

A pair of upper and lower fixed brackets 28 fixed to the closing cover 19 are provided on the lower back surface of the closing cover 19, and a swinging bracket 29 is fixed to the back side of the extended leveling portion 27. The support bracket 30 is rotatably supported by the fixed bracket 28. By rotating the swing bracket 29 around the support shaft 30, the extended leveling portion 27 is rotated about 180 ° around the support shaft 30. Inverted, the extended leveling portion 27 can be changed in posture between an extended posture and a non-use posture.
The swing bracket 29 is fixed to the back surface of the extended leveling portion 27, and extends from the upper and lower ends of the fixed wall 29b to the rear side, and then extends to the inner side in the left-right direction. A pair of upper and lower arm portions 29a, and the inner side in the left-right direction on the rear side of the pair of arm portions 29a is disposed on the inner side in the opposite direction of the pair of fixing brackets 28, respectively. The swing bracket 29 is rotatably supported by the fixed bracket 28 by the support shaft 30 penetrating the arm portion 29a, so that the extended leveling portion 27 can be rotated about the support shaft 30 and the posture can be changed. It is said that.

A rotating member 31 is disposed on the inner side in the opposite direction of one arm portion 29a (lower arm portion 29a) of the swing bracket 29, and the support shaft 30 is inserted into the rotating member 31. Yes.
One end side of a cylindrical member 32 fitted to the support shaft 30 is fixed to the rotating member 31, and the other end side of the cylindrical member 32 is an inner side in the opposite direction of the other arm portion 29a (upper arm portion 29a). A support wall 33 is provided in the vicinity of the cylindrical member 32 and through which the support shaft 30 penetrates, thereby positioning the rotating member 31 and rotating the rotating member 31 and the cylinder. A member 32 is supported on the support shaft 30 so as to be rotatable about the axis.

  The cylindrical member 32 (support shaft 30) is fitted with a biasing means 34 made of a torsion coil spring or the like, and one end side of the torsion coil spring 34 is a spring engaging hole 35 provided in the upper arm portion 29a. The other end side of the torsion coil spring 34 is hooked on a spring hook portion 36 provided on the lower fixing bracket 28, and the extended leveling portion is urged by the urging force of the torsion coil spring 34. 27 is constantly urged in a direction (opening direction) to rotate the extended leveling portion 27 from the non-use posture to the extended posture, and thereby the extended leveling portion 27 is caused by an external force (reaction force) from the ground side. Even if it presses and rotates, this extended leveling part 27 is comprised so that it may not become a non-use posture.

The rotating member 31 is provided with a pushing member 37 that contacts the inner side in the left-right direction of the arm portion 29a of the swing bracket 29 when the extended leveling portion 27 is in the extended posture.
The pushing member 37 is composed of a pin or the like, passes through the turning member 31 so as to protrude upward and downward, and is fixed to the turning member 31. One end side of the inner cable 39 of the Bowden cable 38 (pull cable) is connected to the portion through a connecting member 42 so as to be relatively rotatable around the axis of the pressing member 37, and the lower side protrusion of the pressing member 37 is projected. The portion is in contact with the inner side in the left-right direction on the lower side of the arm portion 29 a of the swing bracket 29.

In addition, the lower fixing bracket 28 is provided with an outer attachment portion 41 for attaching one end side of the outer cable 40 of the Bowden cable 38, and the outer cable 40 is attached to the outer attachment portion 41 via an attachment mechanism 43. It is attached so that its vertical position can be adjusted.
A cable guide 44 is formed on the upper surface of the rotating member 31 (the surface on the opposite side of the arm portion 29 a) so as to have a substantially arc shape centered on the support shaft 30 and guide the inner cable 39. It has been.

In the above configuration, when the extended leveling portion 27 is in the extended posture, the inner cable 39 is wound around the cable guide 44 of the cable guide 44, and the inner cable 39 is pulled from this state. Then, while the pushing member 37 connected to one end of the inner cable 39 presses the swing bracket 29, the turning member 31 turns around the support shaft 30 and rotates the swing bracket 29 around the support shaft 30. The extended leveling part 27 is rotated to a non-use posture (the extended leveling part 27 is closed).
A portion of the swing bracket 29 where the pushing member 37 contacts is a cable engaging portion 45 with which one end of the inner cable 39 is engaged.

  By the way, when the swing bracket 29 is linearly pulled by the inner cable 39 and the extended leveling portion 27 is rotated to the non-use posture, the swing bracket 29 (extension leveling portion 27) is inverted by 180 °. However, in the present embodiment, the rotation member 31 including the arcuate cable guide 44 centered on the support shaft 30 (the rotation center of the swing bracket 29 and the extended leveling portion 27) is provided. By providing, when the inner cable 39 is pulled to rotate the swing bracket 29 (extension leveling portion 27), the inner cable 39 is not pulled linearly but is an arc centered on the support shaft 30. The pulling direction of the pusher member 37 is changed by being pulled so as to move on the line, and thereby the extended leveling portion 27 is reversed by approximately 180 °. Can do it.

Further, when the extension ground leveling portion 27 is not used, when the tension force of the inner cable 39 is released, the extended leveling portion 27 is changed to the extended posture by the biasing force of the biasing means.
The cable guide 44 is not limited to the one having the above-described configuration, and may be guided by one or a plurality of pins.
Further, in the extended posture, the left and right inner ends of the extended leveling portion 27 abut on the left and right outer ends of the leveling portion 14b, thereby rotating the extended leveling portion 27 from the non-use posture to the extended posture. The rotating operation is restricted, and in the extended posture, the rotating member 31 comes into contact with a stopper 41 fixedly provided on the closing cover 19, so The rotation operation in the direction of rotating from the use posture to the extended posture is restricted.

  Further, in the above-described configuration, it is possible to perform the reversing operation of the extended leveling portion 27 even if one end side of the inner cable 39 is connected (directly connected) to the swing bracket 29, but the one end side of the inner cable 39 is swung. When connected to the bracket 29, the inner cable 39 is pushed and pulled when the extended leveling portion 27 is pressed and rotated by an external force (reaction force) from the soil during tillage. However, in this embodiment, one end of the inner cable 39 is not connected to the swing bracket 29 (on the side of the extended leveling portion 27), and the push-motion is separated from the swing bracket 29. The inner cable 39 is connected to the member 37 (not connected to the extended leveling portion 27 side such as the swing bracket 29), and one end side of the inner cable 39 is connected to the swing bracket. 7 (as shown in FIG. 7), even if the extended leveling portion 27 is pressed and rotated by an external force (reaction force) from the ground as shown in FIG. The inner cable 39 is not pushed and pulled, and the inner cable 39 can be prevented from being damaged.

As shown in FIGS. 2 and 10 to 14, the top mast 5 is provided with a pair of left and right operation levers 47 for remotely operating the extended leveling portion 27 corresponding to the left and right extended leveling portions 27.
The top mast 5 is composed of a pair of left and right component members 5a made of a plate material, and the operation lever 47 is disposed on the inner side in the opposing direction (in the left and right direction inner side) of each component member 5a of the top mast 5. .
A pivot 48 having a left and right axial center is provided between the left and right components 5 a in the middle in the vertical direction of the top mast 5, and the lower front part of each operation lever 47 is connected to the pivot 48. The operation lever 47 is supported so as to be rotatable around the axis and immovable in the axial direction, and each operation lever 47 is flexible so as to bend in the left-right direction. Can be swung.

A cable connecting portion 49 for connecting the inner cable 39 of the Bowden cable 38 located on the same left and right sides is provided on the upper side on the lower side rear portion of the left and right operation levers 47, and a contact portion 50 is provided on the lower side. Yes.
In addition, a cable stay 51 located below each operation lever 47 is fixed to each constituent member 5a of the top mast 5 so as to protrude rearward, and on the rear end side of the cable stay 51 on the same left and right sides. The outer cable 40 of the positioned Bowden cable 38 is attached via a mounting mechanism 43 so that the position in the length direction can be adjusted.

Then, by swinging (causing) the operation lever 47 from the position indicated by the solid line in FIG. 2 to the position indicated by the phantom line, the inner cable 39 is pulled and the extended leveling portion 27 is changed from the extended posture to the non-use posture. The posture is changed.
Further, the contact portion 50 of the operation lever 47 is in contact with the upper surface side of the cable stay 51 when the extended leveling portion 27 is in the extended posture, so that the rotation of the operation lever 47 is restricted. ing.
Further, on the back side of each component member 5a of the top mast 5, a lock member 52 (which locks the left and right operation levers 47 at positions where the extended leveling portion 27 is operated in a non-use posture, indicated by phantom lines in FIG. Holding means) is provided.

The lock member 52 includes a fixed plate portion 52a that is fixed to the back side of the constituent member 5a of the top mast 5, and a lock piece 52b that extends rearward from the lower portion on the inner end side in the left-right direction of the fixed plate portion 52a. Have
When the extended leveling portion 27 is in a non-use posture, as shown in FIG. 12 by a solid line and as shown in FIG. 14, the operation lever 47 is moved to the lower side in the left-right direction inner end side of the fixed plate portion 52a (near the lock piece 52b base side). ), The downward swing of the operation lever 47 can be restricted.

Further, in this state, by positioning the operation lever 47 on the outer side in the left-right direction of the lock piece 52b, the operation of the operation lever 47 inward in the left-right direction is restricted by the lock piece 52b. 47 is prevented from coming off from the lock member 52.
Since the operation lever 47 is positioned inside the constituent member 5a constituting the top mast 5, the constituent member 5a also restricts the swinging of the operation lever 47 outward in the left-right direction.
Further, from the locked state of the operating lever 47, as indicated by the phantom line B in FIGS. 11 and 12, the operating lever 47 is slightly swung forward and the operating lever 47 is moved forward from the laterally outer side of the lock piece 52b. The operation lever 47 is disengaged from the lock member 52, and the operation lever 47 can be swung downward by bending the operation lever 47 so that the operation lever 47 is swung inward in the left-right direction. .

In addition, when locking the operation lever 47 in the position which operated the extended leveling part 27 to the non-use attitude | position, the said reverse operation is performed.
The operation lever 47 can be operated from the driver seat of the tractor by raising the rotary tiller 1, and the extended leveling can be remotely operated from the driver seat of the tractor.
The present invention is not limited to the above embodiment, and various design changes can be made.
Further, in the present embodiment, the side drive type rotary tiller is exemplified as the working machine, but a center drive type rotary tiller or other working machines may be used.

It is the figure which looked at the attachment part of the extension leveling part from the lower side. It is a side view of a rotary tiller. It is the figure which looked at the side part lower part of the tillage cover from the back side. It is a back surface enlarged view of the attachment part of an extension leveling part. It is a side view of the attachment part of an extended leveling part. It is a figure which shows the attitude | position change state of an extended leveling part, (a) shows an extended attitude | position, (b) shows a non-use attitude | position. It is a figure which shows the state which the extension leveling part rotated with the external force from the ground. It is a figure which shows a rotation member, a cylindrical member, a pushing member, and a cable guide. It is a side view of the lower part of a rear cover, and a closure cover. It is a simplified rear view of a rotary tiller. It is a side view of an operation lever attachment part. It is a side view of the lock part of an operation lever. It is a back surface schematic block diagram of the operation mechanism of an extended leveling part. It is the figure which looked at the lock part of the operation lever from the back side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rotary tilling part 14 Rear cover 14b Leveling part 18 Notch part 19 Closure cover 27 Extension leveling part 31 Rotating member 34 Energizing means 37 Pushing member 39 Inner cable 44 Cable guide 45 Cable engaging part 52 Locking member (holding means) )

Claims (6)

A leveling part (14b) for leveling the field and an extended leveling part (27) extending outward in the left-right direction from the leveling part (14b) are provided. The extended leveling part (27) is provided from the leveling part (14b). In the working machine that is rotatable so that the posture can be changed from an extended posture extending outward in the left-right direction to a non-use posture positioned above the leveling portion (14b),
The urging means (34) for constantly urging the extended leveling part (27) in the direction of rotating from the non-use posture to the extended posture, and the posture change of the extended leveling part (27) from the extended posture to the non-use posture. And a holding means (52) for restricting movement of the cable (39) and holding the extended leveling portion (27) in the folded position. Work machine.   The pushing member (37) provided on one end of the cable (39) is brought into contact with the cable engaging portion (45) provided on the extended leveling portion (27) side, and the other end of the cable (39) is pulled. The extended leveling part (27) is configured to rotate to a non-use posture, and the pushing member (37) and the cable engaging part (45) are configured so that the extended leveling part (27) is connected to the grounding surface side. The working machine according to claim 1, wherein the working machine is separable so as to be separated when rotating to a non-use posture side by an external force.   A leveling portion (14b) is provided on the lower end side of the rear cover (14) covering the rear of the rotary tillage portion (10), and a notch portion (18) is formed on the side portion on the lower end side of the rear cover (14). And a closing cover (19) for closing the notch (18) is detachably provided, and the extended leveling part (27) is supported by the closing cover (19). The working machine according to 1 or 2.   A cable guide that guides the cable (39) so that the extended leveling part (27) is reversed from the extended position to the upper side of the leveling part (14b) so that the extended leveling part (27) is turned to the non-use position. The work machine according to any one of claims 1 to 3, wherein (44) is provided.   A rotation member (31) that is rotatable around the rotation center of the extended leveling portion (27) is provided. One end side of the cable (39) is connected to the rotation member (31) and the extended leveling portion (27 ) And a cable guide (44) for guiding the cable (39) around the rotation center of the extended leveling portion (27). And pulling the cable (39) to rotate the rotating member (31) and pressing the cable engaging portion (45) by the pushing member (37), thereby moving the extended leveling portion (27) from the extended posture. The working machine according to claim 1, wherein the working machine is configured to rotate to a non-use posture.   The biasing means (34) is constituted by a torsion coil spring, and the torsion coil spring is fitted into a support shaft (30) which is a rotation center of the extended leveling portion (27). Crab working machine.

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