JP4711979B2 - Working machine - Google Patents

Description

  The present invention relates to a working machine having a tilling function, such as a rotary tiller and a plowing harrow.

2. Description of the Related Art Conventionally, there is a rotary tiller as a working machine having a tilling function, and the rotary tiller is mounted on a rear part of a tractor via a mounting device such as a three-point link machine, and the machine frame. The cultivating unit is provided with a plurality of cultivating claws attached to a claw shaft rotatably provided around a horizontal axis in the lower part of the cultivating unit, and a cultivating cover that covers the cultivating unit.
The tillage cover includes an upper cover that covers the top of the tillage part, and a rear cover that covers the rear of the tillage part. The upper cover is fixed to the machine frame, and the upper end of the rear cover is on the rear end side of the upper cover. It is supported so as to be rotatable about the left and right axes, and the lower end side is grounded to the farm field.

Further, as a rear cover, a main part constituting most of the rear cover, a detachable cover detachably provided on the lower end side of the main part, and a detachable cover that is rotatably attached to the detachable cover. Accordingly, there is an extended leveling portion that can be changed in posture from an extended posture extended outward in the left-right direction from the side edge of the main portion to a retracted posture located on the back side of the detachable cover. .
In addition, an operation wire for changing the posture of the extended leveling portion by remote operation is provided, and the operation wire is operated by an operation lever to change the posture of the extended leveling portion, and an outer wire for guiding the inner wire. There is a rotary cultivator constituted by (see Patent Documents 1 and 2).
Japanese Patent Laid-Open No. 2005-130824 JP 2005-245325 A

In the conventional rotary tiller, the end of the outer wire on the side of the extended leveling part and the end of the inner wire on the side of the extended leveling part are attached to the side of the detachable cover. When removing, the end on the extended leveling part side of the outer wire and the end on the extended leveling part side of the inner wire must be removed from the detachable cover side, which makes it difficult to install and remove the detachable cover There is.
Then, in view of the said problem, this invention aims at providing the working machine which can simplify the attachment / detachment work of a detachable cover.

The technical means taken by the present invention in order to solve the technical problem includes a cover member whose upper end side is rotatably supported around the left and right axis on the machine frame side and whose lower end side is grounded to the field and ground. the cover member has a major portion, the main portion and the removable cover which lower end is detachably attached to the side edge of the main part by rotating optionally rotatably attached to the removable cover An extended leveling portion capable of changing the posture from an extended posture extending outward in the left-right direction to a retracted posture located on the back side of the detachable cover,
An inner wire to change the posture of the extension leveling unit is operated by the operating member the extension leveling unit and the extension leveling unit provided between the operating member for remotely operating the outer wire guide this inner wire With an operation wire composed of
The end of the outer wire closer to the operation member is attached to the outer mounting bracket provided on the machine frame side, and the end of the inner wire protruding from the end of the outer wire closer to the operation member Connected to
The attachment to the main portion of the end remote from the operating member of the outer wire Rutotomoni, the ends of the inner wire being operatively connected to the extension leveling portion protrude from the end remote from the operating member of the outer wire Can be removed from the extended leveling part .

Further, an end portion of the inner wire being operatively connected to the extension leveling unit is connected to one end of the connecting wire through a connecting means, the other end of the connecting wire is extended leveling unit in conjunction with the movement of the inner wire Is connected to the extended leveling part side so that the posture changes, and the connecting means is connected to one end of the connecting wire or one end of the inner wire connected to the extended leveling part (23) and the other to the connecting member The connected member is configured such that the connected state is maintained by applying tension to the inner wire to the connecting member, and the connected state can be released by loosening the inner wire. It is good to be.

  In addition, a locking hole is formed in the connecting member and an engaging portion is provided in the connected member, and the connected member can be removably inserted into the locking hole in a state where the inner wire is loosened. The connecting member is configured to be prevented from being detached from the connecting member by engaging the engaging portion with the edge of the locking hole in a state where the connecting member is inserted into the hole and the inner wire is stretched. It is good to do.

  According to the present invention, when attaching / detaching the detachable cover from the main part, it is only necessary to attach / detach the extended leveling part side of the inner wire of the operation wire, and the attaching / detaching work of the detachable cover can be simplified.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 6, reference numeral 1 denotes a rotary cultivator exemplified as a working machine that is mounted on the rear part of the tractor so as to be movable up and down via a three-point link mechanism or the like.
The rotary cultivator 1 has support arms 3 projecting from the center gear case on the left and right sides, fixing the upper part of the transmission case 4 to the left and right outer ends of one support arm 3, and the left and right sides of the other support arm 3. The upper part of the side frame is fixed to the outer end side in the direction, and the machine casing 5 is mainly configured in a gate shape.

A top mast 6 is fixed to the gear case of the machine frame 5 so as to protrude upward, and an upper connection bracket 7 is provided on the top mast 6 so as to protrude forward and upward. An upper mounting pin 8 that is attached to the rear end side of the top link of the point link mechanism or is engaged with a hook portion provided on the upper part of a connecting frame that is connected to the rear end side of the three-point link mechanism is provided.
Each of the left and right support arms 3 of the machine frame 5 is provided with a lower connection bracket 9, and the lower end of the lower connection bracket 9 has a rear end of the lower link of the three-point link mechanism or a rear of the three-point link mechanism. A lower mounting pin 10 is provided to be attached to the lower part of the connecting frame connected to the end side.

A lower part of the machine casing 5 has a claw shaft 11 that is supported between the lower part of the transmission case 4 and the side frame so as to be rotatable about a lateral axis, and a number of attachments attached to the claw shaft 11. A cultivating section 13 including a cultivating claw 12 is provided.
The gear case of the machine frame 5 is provided with a PIC shaft 14 to which power is transmitted from the PTO shaft of the tractor via the drive shaft. The power transmitted to the PIC shaft 14 is a power transmission mechanism in the gear case. It is transmitted to the claw shaft 11 through the transmission shaft in the support arm 3 and the power transmission mechanism in the transmission case 4, and the claw shaft 11 is configured to be driven to rotate in the direction indicated by the arrow A, for example.

The rotary cultivator 1 is provided with a cultivating cover 15 that covers the cultivating section 13. The cultivating cover 15 includes an upper cover 16 that covers the upper portion of the cultivating section 13 and a rear cover that covers the rear of the cultivating section 13. 17 (cover member) and a side cover 18 that covers both the left and right sides of the rear portion of the tillage portion 13 are provided.
The upper cover 16 is attached and fixed to the transmission case 4 and the side frame at the ends in the left-right direction.
The rear cover 17 is pivotally supported on the rear end side (the machine frame 5 side) of the upper cover 16 so as to be rotatable about the axis of a pivot 19 having a horizontal axis, and can swing up and down. The lower end side touches the field and levels the field.

Reinforcing members 20 are provided on the left and right sides of the rear surface of the rear cover 17 from the upper side to the lower side of the rear cover 17.
The side cover 18 is fixedly attached to the transmission case 4 or the side frame.
The rotary cultivator 1 is provided with a retracting device that urges the lower end side of the rear cover 17 downward (in the grounding direction), and a support frame for attaching a gauge wheel, a soil cultivator, a vertical stand, and the like. Etc. are provided.
In the present embodiment, as shown in FIG. 4, the rear cover 17 constitutes a major part of the rear cover 17 and is a main part 21 that is a part that receives mainly the soil released from the tilling part 13. A pair of left and right closing covers 22 (detachable covers) that close the notches 49 formed on the left and right ends of the lower end side of the main portion 21 and on the outer side in the left and right direction of the reinforcing member 20, and the left and right closing covers It is mainly composed of an extended leveling portion 23 provided on the cover 22.

As shown in FIG. 7, the main portion 21 of the rear cover 17, the lower end side of the closing cover 22, and the extended leveling portion 23 are formed in a groove shape whose rear side is open toward the rear (front side). It is a curved shape that is convex toward the side).
The main part 21 of the rear cover 17 and the front face of the lower end side of the closing cover 22 and the front face of the extended leveling part 23 are grounded so as to level the soil cultivated by the tilling part 13.
In the present embodiment, the main leveling portion 24 corresponding to the left and right width of the main portion 21 of the rear cover 17 is configured from the ground portion on the lower end side of the main portion 21 and the ground portion on the lower end side of the closing cover 22. The leveling part 24 and the extended leveling part 23 constitute a leveling part 25 of the rear cover 17.

As shown in FIGS. 3 and 4, the extended leveling portion 23 includes an extended posture B extending outward in the left-right direction from the main leveling portion 24 (side edge of the main portion 21), and the main leveling portion 24. The main leveling portion 24 is rotatably supported by the main leveling portion 24 so that the posture can be changed to the retracted posture C located on the back side (the anti-grounding side) (in this embodiment, the extended leveling portion 23 is attached to the closing cover 22. It is attached and extends outward in the left-right direction from the lower side of the closing cover 22 to be in the extended posture B).
In the extended posture B, the left and right inner end sides of the extended leveling portion 23 are in contact with the left and right outer ends of the lower portion of the closing cover 22, and in the retracted posture C, the extended leveling portion 23 is superimposed on the closing cover 22. Is located.

Each of the left and right extension leveling portions 23 is linked to an operation lever (operation member) 26 supported by the top mast 6 so as to be swingable about a left and right axis via an operation wire 27 and the like. The left and right extension leveling portions 23 can be changed to the extended posture B and the retracted posture C simultaneously by swinging the operation lever 26.
The operation lever 26 can be gripped from the driver seat side of the tractor by raising the rotary tiller 1, whereby the extended leveling portion 23 can be remotely operated from the driver seat of the tractor.

The operation wire 27 is composed of a Bowden wire, a push-pull wire or the like, and is mainly composed of an inner wire 28 and an outer wire 29 that guides the inner wire 28, and one end 57 side of the inner wire 28 is connected via a connecting wire 51. The extended leveling portion 23 is linked and linked to the extended leveling portion 23 side (a member for changing the posture of the extended leveling portion 23) so that the posture of the extended leveling portion 23 changes in conjunction with the movement of the inner wire 28.
The other end side of the inner wire 28 is connected to the operation lever 26 side, and one end side of the outer wire 29 is connected to the lower end side (main portion 21 side) of the reinforcing member 20 on the rear surface of the rear cover 17. The other end side of the outer wire 29 is attached to and supported by an outer mounting bracket 31 provided on the top mast 6 so as to be rotatable about the left and right axis, and the inner wire 28 is operated by the operation lever 26. Thus, the extended leveling unit 23 can be changed in posture.

In the present embodiment, when the operating lever 26 is located at the retracting operation position D indicated by a solid line in FIG. 6, the extended leveling portion 23 is in the retracting position C, and the operating lever 26 is moved from the retracting operation position D. By swinging to the extended operation position E indicated by the phantom line in FIG. 6, the extended leveling portion 23 is operated to change the posture from the retracted posture C to the extended posture B, and the operation lever 26 is retracted from the extended operation position E. When returned to the operation position D, the extended leveling portion 23 is configured to be changed in posture from the extended posture B to the retracted posture C.
The operation lever 26 is in contact with the outer mounting bracket 31 to restrict movement in the swinging direction from the extended operation position E to the retreat operation position D, and the extended leveling portion 23 is held in the retreat posture C. When the operating lever 26 is hooked on the stopper 32 provided on the top mast 6 at the extended operation position E, the movement in the swinging direction from the extended operation position E to the retracting operation position D is restricted, and the extended leveling is performed. The portion 23 is configured to be held in the extended posture B.

Next, the mounting structure of the extended leveling portion 23 will be described in detail.
As shown in FIGS. 1 to 5, a fixing bracket 36 is fixed to the outer side of the back surface of the closing cover 22 in the left-right direction.
The fixing bracket 36 is formed by bending a plate material, and has a bottom wall 36a fixed to the back side of the closing cover 22 and a pair of support walls 36b extending rearward from the upper and lower edges of the bottom wall 36a. The pair of support walls 36b are arranged opposite to each other while their plate surfaces are along the left-right direction.

The fixed bracket 36 is provided with a rotating support shaft 37 having an axis center in a direction orthogonal to the plate surface of the support wall 36 b over the upper and lower support walls 36 b, and the swing bracket 38 is provided via the rotation support shaft 37. The fixed bracket 36 is supported so as to be rotatable about the axis of the rotation support shaft 37.
By fixing the extended leveling portion 23 to the swing bracket 38, the extended leveling portion 23 is supported by the closing cover 22 (main leveling portion 24) so as to be rotatable about the axis of the rotation support shaft 37. By rotating the extended leveling portion 23 around the axis of the support shaft 37, the extended leveling portion 23 can be changed in posture between an extended posture B and a retracted posture C.

The swing bracket 38 is formed by bending a plate material, and has a pair of upper and lower arm portions 38 a located on the opposite side of each support wall 36 b of the fixed bracket 36, and the upper and lower arm portions 38 a support the fixed bracket 36. The wall 36b is bent so as to extend outward in the left-right direction and then to the extended leveling portion 23.
Further, the swing bracket 38 has a fixed wall 38b that is fixed to the inner side in the left-right direction on the back surface of the extended leveling portion 23 and that connects the upper and lower arm portions 38a.
Between the arm portions 38a of the swing bracket 38, there is provided a rotation shaft 39 that is externally fitted around the rotation support shaft 37 so as to be rotatable about the axis. A pressing member 40 made of a plate material having a plate surface perpendicular to the axis of the rotation shaft 39 is fixed to the intermediate portion.

The pressing member 40 has a pressing portion 40 a that comes into contact with the fixed wall 38 b of the swing bracket 38, and the pressing member 40 is operated to rotate around the axis of the rotation support shaft 37. As a result, the extended leveling portion 23 is pressed via the swing bracket 38 and the extended leveling portion 23 is changed from the extended posture B to the retracted posture C.
Further, on the one side (upper side) in the rotational axis direction of the pushing member 40, a retreat operation for biasing the pushing member 40 so as to turn the extended leveling portion 23 from the extended posture B to the retracted posture C side. A spring (retraction operation biasing means) 41 is arranged.

The retraction operation spring 41 is formed of a torsion coil spring and is fitted on the rotation shaft 39, and one end is hooked on the pushing member 40 and the other end is hooked on the support wall 36 b of the fixed bracket 36.
As shown in FIGS. 1 to 5 and FIG. 8, the end 57 of the inner wire 28 on the extended leveling portion 23 side is detachably connected to one end 56 side of the connecting wire 51 via the connecting means 44. The other end side is interlocked and connected to the pushing member 40 so that the extended leveling portion 23 changes its posture in conjunction with the movement of the inner wire 28.
Specifically, a connecting tool 42 is connected to the other end of the connecting wire 51, and a pin insertion hole 50 is formed through the connecting tool 42 on the opposite side of the connecting wire 51 from the connecting wire 51. A pin 46 projects from the lower surface of the pusher member 40 in parallel with the axis of the rotary shaft 39, and the pin 46 rotates around the axis with respect to the pin insertion hole 50 of the connector 42. The other end side of the connecting wire 51 is pivotally connected to the pushing member 40 by being relatively inserted through the connecting member 51.

Further, by preventing the pin 46 from being removed from the pin insertion hole 50 by a retaining member (not shown) such as a beta pin, the connecting member 42 is prevented from coming off from the pin 46.
The connecting means 44 includes a connecting member 54 provided at one end of the connecting wire 51 and a connected member 55 provided at an end 57 of the inner wire 28 on the extended leveling portion 23 side.
One end 56 of the connecting wire 51 is connected to one end side portion 54a of the connecting member 54 in the inner wire length direction D (hereinafter simply referred to as the wire length direction).

Further, the connecting member 54 is formed in a stepped shape at the intermediate portion in the wire length direction D so that the thickness of the other end portion 54b in the wire length direction D is thinner than the thickness of the one end portion 54a. In addition, a locking hole 58 is formed in the other end side portion 54b of the connecting member 54 so as to penetrate in the thickness direction E.
One end side portion 55a of the to-be-connected member 55 in the wire length direction D is in contact with one side surface of the one end side portion 54a of the connecting member 54 in the thickness direction E. The intermediate portion 55 c is inserted so as to pass through the locking hole 58 of the connecting member 55, and the other end side portion 55 b in the wire length direction D of the connected member 55 is other than the thickness direction E of the connecting member 54. The side surface is arranged on the side and extends in a direction opposite to the extending direction from the intermediate portion 55c of the one end side portion 55a.

In addition, an end portion 57 of the inner wire 28 on the extended leveling portion 23 side is connected to the other end side portion 55b of the coupled member 55.
Further, the one end side portion 55a and the other end side portion 55b of the connected member 55 are separated from each other in the wire length direction D, and the intermediate portion 55c is inclined with respect to the one end side portion 55a and the other end side portion 55b. The intermediate portion 55c is inserted into the locking hole 58 so as to intersect the axial direction of the locking hole 58.
In the connecting means 44 having the above-described configuration, the connected member 55 is inserted into the locking hole 58 of the connecting member 54 and the inner wire 28 and the connecting wire 51 are tensioned (the inner wire 28 and the connecting wire). In the state where 51 is tensioned in the length direction D), the connecting side of the intermediate portion 55c of the connected member 55 with the other end portion 55b is in contact with the edge of the locking hole 58 and the connected member The one end side portion 55a of 55 is in contact with one side surface in the thickness direction E of the one end side portion 54a of the connecting member 54, so that the connecting member 55 is prevented from being pulled out from the locking hole 58. The connected state of 44 is maintained.

The contact portion 59 of the intermediate portion 55c of the connected member 55 with the edge portion of the locking hole 58 engages with the edge portion of the locking hole 58 in a state where the inner wire 28 is stretched. The engaging portion prevents the 55 from being detached from the connecting member 54.
Further, when the inner wire 28 is loose, as shown in FIG. 9, the connected member 55 is disposed at the other end portion 55b while the other end portion 55b of the connected member 55 is moved to the connecting wire 51 side. By moving to the side, the connected member 55 can be removed from the locking hole 58 of the connecting member 54, and the connecting means 44 can be easily connected / released without using a tool. It is configured as follows.

The connecting member 54 may be connected to the end 57 of the inner wire 28 on the extended leveling portion 23 side, and the connected member 55 may be connected to the one end 56 side of the connecting wire 51.
In other words, in other words, the configuration of the inner wire 28 on the extended leveling portion 23 side is pivotally connected to the pushing member 40 by the end of the inner wire 28 on the extended leveling portion 23 side via the coupling tool 42 and the pin 46. The extended leveling portion 23 side of the inner wire 28 is divided at a midway between the end of the inner wire 28 on the extended leveling portion 28 side and the end of the outer wire 29 on the extended leveling portion 23 side. It can be said that a connecting member 54 is provided on one of the divided portions of the wire 28 and a connected member 55 detachably connected to the connecting member 54 is provided on the other.

The pushing member 40 is rotated by the retracting operation spring 41 when the extended leveling portion 23 is in the retracted posture C, and is rotated by the inner wire 28 when the extended leveling portion 23 is in the extended posture B. It is configured to be operated.
Further, a wire guide 43 for guiding the inner wire 28 is provided on the other side surface (lower side surface) of the pushing member 40 in the rotational axis direction, and most of the wire guide 43 except for both end portions is pivotally supported. It is formed in an arc shape centered on the axis of the shaft 37.
As shown in FIGS. 1 and 3, in the state where the extended leveling portion 23 is in the extended posture B, the wire guide 43 is positioned on the inner side in the left-right direction of the rotation support shaft 37, and one end of the inner wire 28. The side passes between the wire guide 43 and the main leveling portion 24 and is connected to the pushing member 40 between the turning support shaft 37 (the turning fulcrum of the pushing member 40) and the main leveling portion 24. In this state, when the operating lever 26 is swung from the extended operation position E to the retracting operation position D, the pushing member 40 is rotated around the axis of the rotation support shaft 37 by the urging force of the retracting operation spring 41. Accordingly, when the swing bracket 38 is pressed by the pressing portion 40a, the extended leveling portion 23 is changed to the retracted posture C (the extended leveling portion 23 is moved via the swing bracket 38). Appeared to the retracted posture C by being pushed by the pushing member 40 To change operation).

At this time, the inner wire 28 moves around the rotation support shaft 37 while being wound around the wire guide 43 as the pushing member 40 rotates.
In the present embodiment, in the extended posture B, the restraining spring 45 serving as an extended leveling portion restraining biasing means for biasing the extended leveling portion 23 in the direction of pressing the extended leveling portion 23 against the farm field is It is provided over.
The holding spring 45 is formed of a tension coil spring, and one end side is hooked on the spring hooking portion 47 of the pushing member 40, and the other end side is hooked on a spring hooking member 48 fixed to the extended leveling portion 23.

One end side of the holding spring 45 is hooked between the pressing portion 40a and the rotation support shaft 37, and the extended leveling portion 23 is moved to the pushing member 40 side (the fixed wall 38b of the swing bracket 38 is pushed). The extended leveling portion 23 is biased so as to be pressed against the pressing portion 40a of the member 40.
When the extended leveling section 23 is changed from the retracted position C to the extended position B, the operation lever 26 is swung from the retracted operation position D to the extended operation position E, and the inner wire 28 is pulled. As a result, the pushing member 40 turns in the direction in which the extended leveling portion 23 turns to the extended posture B. At this time, the extended leveling portion 23 is urged by the restraining spring 45 so as to be pressed against the pushing member 40 side. Therefore, the extended leveling portion 23 follows the pushing member 40 and rotates to the extended posture B.

When the extended leveling portion 23 is in the extended posture B and the extended leveling portion 23 is pushed up by an excessive load from the soil, the fixed wall 38b of the swing bracket 38 is separated from the pressing portion 40a and restrained. The extended leveling portion 23 rotates against the biasing force of the spring 45.
The notches 49 formed on the left and right sides of the lower end side of the main portion 21 of the rear cover 17 are for avoiding interference with the piece cultivator when the piece cultivator is attached to the rotary tiller 1 and are closed. The cover 22 is removed when the single cultivator is attached to the rotary tiller 1.
As shown in FIG. 7, the lower end side of the main portion 21 of the rear cover 17 is formed in a cylindrical shape that is folded in a curved shape and has a horizontal axis, and the rear lower end side of the closing cover 22 has a horizontal direction. An insertion member 33 made of a pipe, rod or the like having an axial center is fixed, and this insertion member 33 protrudes inward in the left-right direction from the closing cover 22, and the protruding portion is a cylindrical portion at the lower end of the main portion 21. 34 is removably inserted.

Further, at least the upper side of the closing cover 22 is detachably attached to the main portion 21 by attachment means (not shown).
Therefore, the attachment by the attachment means for attaching the upper side of the closure cover 22 to the main portion 21 is released, and then the insertion member 33 of the closure cover 22 is removed from the cylindrical portion 34 at the lower end of the main portion 21 to thereby close the closure cover 22. Can be removed from the main portion 21.
When removing the closing cover 22, the extended leveling portion 23 side of the operation wire 27 must be removed from the closing cover 22 side. However, in this embodiment, the end portion of the outer wire 29 on the extended leveling portion 23 side is Since it is attached to the outer receptacle 30 provided in the main portion 21 and only the inner wire 28 is connected to the closed cover 22 side on the extended leveling portion 23 side of the operation wire 27, it is attached when the closed cover 22 is removed or attached. In this case, it is not necessary to attach and detach the end portion of the outer wire 29 on the extended leveling portion 23 side, and only the extended leveling portion 23 side of the inner wire 28 may be removed from the closing cover 22 side or attached to the closing cover 22 side. Thus, it is possible to simplify the removal work and the installation work of the closing cover.

In the present embodiment, in order to remove or attach the extended leveling portion 23 side of the inner wire 28 from the closing cover 22 side, the operating lever 26 is moved to the retracting operation position D to retract the extended leveling portion 23. In this state, the extended leveling portion 23 is manually rotated to the extended posture B side without operating the operation lever 26.
Then, since the inner wire 28 is loosened, the connection between the connecting member 54 of the connecting means 44 and the connected member 55 can be released or the connecting member 54 and the connected member 55 can be connected as described above.

In the present embodiment, a connecting tool 42 that is pivotally connected to the pin 46 of the pushing member 40 is connected to the end 57 of the inner wire 28 on the extended leveling portion 23 side, so that the extended leveling portion of the inner wire 28 is connected. The end portion 57 side on the 23 side is directly pivotally connected to the pushing member 40, and the connecting tool 42 is removed from the pin 46 when the extended leveling portion 23 side of the inner wire 28 is removed from the closing cover 22 side. Good.
As shown in FIG. 10, in the conventional mounting structure of the extended leveling portion 23, the extended leveling portion 23 is always biased in the direction of rotating to the extended posture B by the biasing force of the torsion coil spring 52, and the inner wire One end side of the inner wire 28 is pivotally connected to a wire guide 53 that is rotatable about a rotation support shaft 37 that rotatably supports the extended leveling portion 23, and one end side of the inner wire 28 is pivotally supported. When the inner wire 28 is pulled when the pin 46 is in contact with the swing bracket 38 and the extended leveling portion 23 is in the extended posture B, the pin 46 pivotally supports one end side of the inner wire 28. The swing bracket 38 is pressed, and the extended leveling portion 23 is configured to rotate around the rotation support shaft 37 from the extended posture B to the retracted posture C against the urging force of the torsion coil spring 52. Adjustment As the portion 23 is rotated from the extended posture B to the retracted posture C, the urging force of the torsion coil spring 52 that biases the extended leveling portion 23 gradually increases, and the extended leveling portion 23 is changed to the extended posture B and the retracted posture C. The operating force for switching (in this case, the operating force for changing the posture of the extended leveling section 23 from the extended posture B to the retracted posture C) is large.

  On the other hand, in the present embodiment, the extension leveling unit 23 is rotated from the extended posture B to the retracted posture C side by the urging force of the retracting operation spring 41 and presses the extended leveling unit 23 against the field. Since this is performed by the urging force of the restraining spring 45, the urging force for rotating the extended leveling portion 23 to the retracted posture C is necessary even if the urging force that presses the extended leveling portion 23 against the field is sufficiently large. Since the urging force can be minimized, an operating force for switching the extended leveling portion 23 between the extended posture B and the retracted posture C (in this case, when changing the posture of the extended leveling portion 23 from the retracted posture C to the extended posture B) ) Can be reduced.

  Further, in the conventional one shown in FIG. 10, the extended leveling portion 23 is operated to change the posture from the extended posture B to the retracted posture C by pulling the inner wire 28. One end side of 28 is pivotally connected to the wire guide 53 between the rotation support shaft 37 and the extended leveling portion 23 with the extended leveling portion 23 in the retracted posture C, and the operating force of the inner wire 28 is released. As a result, the extended leveling portion 23 is rotated to the extended posture B around the rotation support shaft 37 by the urging force of the torsion coil spring 52, while the inner wire 28 is wound around the wire guide 53 while the pushing member 40 is moved. It is comprised so that it may move around the rotation spindle 37 with rotation.

In this conventional structure, in order to avoid interference with the extended leveling portion 23, the operation wire 27 is arranged linearly in the vicinity of the mounting portion of the extended leveling portion 23 as shown in FIG. The operation wire 27 must be bent in the vicinity of the outer receptacle 30 that fixes one end of the outer wire 29, and the inner wire with respect to the outer wire 29 at the curved portion of the operation wire 27. There is a problem that the sliding resistance of 28 increases, which increases the operating force.
On the other hand, in the present embodiment, when the extended leveling portion 23 is in the retracted posture C, the extended leveling portion 23 is operated to change the posture from the retracted posture C to the extended posture B by pulling the inner wire 28. One end side of the inner wire 28 is connected to the pushing member 40 between the rotation support shaft 37 and the main leveling portion 24 with the extended leveling portion 23 in the extended posture B, and the inner wire By releasing the operating force of 28, the extended leveling portion 23 is rotated to the retracted posture C by the urging force of the retracting operation spring 41, while the inner wire 28 is wound around the wire guide 53 while the pushing member 40 It is comprised so that it may move around the rotation spindle 37 with rotation.

With this configuration, in the present embodiment, as shown in FIG. 3, the operation wire 27 can be arranged in a straight line in the vicinity of the mounting portion of the extended leveling portion 23. An increase in operating force due to the bending of the wire 27 can be prevented.
In the prior art, members similar to those of the present embodiment are denoted by the same reference numerals, and description thereof is omitted.
Note that the present invention has a structure for attaching the extended leveling portion 23 of the rotary tiller having the conventional structure shown in FIG. 10 (the extended leveling portion 23 is urged to rotate to the extended posture B side, and the inner wire 28 It may be adopted for a posture changing operation to the retracted posture C).

When the present invention is applied to the mounting structure of the extended leveling portion 23 having the conventional structure, the extended leveling portion 23 is rotated to the retracted posture C side from the state where the extended leveling portion 23 is in the extended posture B. Thus, the inner wire 28 is loosened, and the extended leveling portion 23 side of the inner wire 28 can be removed from the closed cover side.
Moreover, although the side drive type rotary cultivator 1 has been exemplified as the rotary cultivator 1, the center drive type rotary cultivator 1 or the like may be adopted, and the working machine to which the present invention is adopted is a scraper. It may be hello.

  Further, as a form of the rear cover 17, a leveling cover (detachable cover) formed to have a left and right width substantially corresponding to the left and right width of the main portion 21 is detachably attached to the lower end side of the main portion 21. It may be of a type in which the extended leveling portion 23 is attached to both sides so that the posture can be freely changed.

It is sectional drawing which looked at the attachment part of the extended leveling part in an extended attitude | position from the lower side. It is sectional drawing which looked at the attachment part of the extended leveling part in a retracted attitude from the lower side. It is the figure which looked at the left side of the lower end side of a rear cover from the lower side. It is a rear view of the left side of a rear cover. It is a rear view of the attachment part of an extended leveling part. It is a side view of a rotary tiller. It is a disassembled side view of the main part of a rear cover, a closing cover, and an extended leveling part. It is a figure which shows the connection part by the side of the extended leveling part of an inner wire, Comprising: (a) is the figure which looked at the connection means in a connection state from the lower side, (b) looked at the connection means in a connection state from the back side. It is sectional drawing. It is sectional drawing which shows releasing operation | movement of the connection means of an inner wire. It is the schematic which shows the attachment structure of the conventional extended leveling part.

Explanation of symbols

5 Machine frame 17 Rear cover (cover member)
21 Main parts 22 Closure cover (detachable cover)
23 Extension leveling part 26 Operation lever (operation member)
27 operation wire 28 inner wire 29 outer wire 44 connecting means 51 connecting wire 54 connecting member 55 connected member 56 one end of the connecting wire 57 end of the inner wire on the side of the extended leveling portion 58 locking hole 59 engaging portion B extending posture C Retreat posture

Claims (3)

With the upper end side of the cover member (17) which lower end is leveled with the ground in the field while being rotatably supported in the left and right axis on the machine frame (5) side, the cover member (17), major portion ( 21), a detachable cover (22) detachably provided on the lower end side of the main portion (21), and a main portion ( 21) an extended leveling section (21) whose posture can be changed from an extended posture (B) extending outward in the left-right direction from the side edge of 21) to a retracted posture (C) located on the back side of the removable cover (22). 23)
Extended leveling unit (23) position is operated are provided by the operating member (26) between the extended leveling unit (23) and the extension operation member leveling unit (23) for remotely operating (26) An operation wire (27) composed of an inner wire (28) to be changed and an outer wire (29) for guiding the inner wire (28) ;
The end of the outer wire (29) closer to the operation member (26) is attached to the outer mounting bracket (31) provided on the machine frame (5) side, and the operation member (26 of the outer wire (29) is attached. ) The end of the inner wire (28) protruding from the end near the end to the operating member (26),
Projecting from said operating member attached to the main portion of the end portion farther from (26) (21) Rutotomoni, the outer wire operating member (26) from the far side of the end portion (29) of the outer wire (29) An end portion (57) of the inner wire (28) linked to the extended leveling portion (23) can be removed from the extended leveling portion (23) . The end portion (57) of the inner wire (28) linked to the extended leveling portion (23) is connected to one end (51) side of the connecting wire (51) via the connecting means (44). The other end of (51) is interlocked and connected to the extended leveling part (23) side so that the posture of the extended leveling part (23) changes its position in conjunction with the movement of the inner wire (28), and the connecting means (44) is connected. One end (56) of the wire (51) or one end (57) of the inner wire (28) linked to the extended leveling portion (23) and one of the connecting members (54) provided on the other. The connecting member (55) is configured so that the connected member (55) is maintained in a connected state by applying tension to the inner wire (28) with respect to the connecting member (54) and loosens the inner wire (28). The connected state is Working machine according to claim 1, characterized in that it is configured for.   A locking hole (58) is formed in the connecting member (54) and an engaging portion (59) is provided in the connected member (55), and the connected member (55) is loosened with the inner wire (28). The locking hole can be inserted into the locking hole (58) in a detachable manner, the connected member (55) is inserted into the locking hole (58), and the inner wire (28) is stretched. The engagement portion (59) is engaged with the edge portion of the (58) to prevent the connected member (55) from being detached from the connection member (54). 2. The working machine according to 2.

Images