JP4275040B2 - Rotary - Google Patents

Description

  The present invention relates to a rotary for plowing a field.

Conventionally, there is a rotary as a working machine for plowing a field and leveling, and the rotary is mounted on a rear part of a tractor through a three-point link mechanism and the like so as to be movable up and down, and in a horizontal direction at a lower part of the machine frame. A rotary tiller part in which a number of tilling claws are attached to a claw shaft provided so as to be rotatable around the axis of the shaft, and a rotary cover that covers the rotary tiller part.
The rotary cover includes an upper cover that covers the top of the rotary plow and a rear cover that covers the rear of the rotary plow, and a leveling unit that grounds the ground while being grounded to the field is provided on the lower end side of the rear cover.

Further, the leveling portion provided on the lower end side of the rear cover includes a main leveling portion having a width corresponding to the left and right width of the main portion on the upper side of the rear cover, and an extended leveling provided rotatably on the left and right sides of the main leveling portion. And the extended leveling part rotates to extend in the left-right direction from the main leveling part and to the non-use position located above the main leveling part. There is a rotary which can change its posture and is configured such that the extended leveling portion is remotely operated by an operation lever provided on the upper side of the machine casing. (See Patent Documents 1 to 3).
This rotary has a tension coil spring that extends between the extended leveling part and the main leveling part. In the extended position, the tension coil spring rotates the extended leveling part from the non-use position to the extended position. In the non-use posture, it is provided so that the urging force is switched so as to urge the extended leveling portion in the direction of rotating from the extended posture to the non-use posture. Can be held in an extended posture and a non-use posture.
JP-A-5-207801 Japanese Utility Model Publication No. 62-19125 Japanese Utility Model Publication No. 60-18001

In the conventional rotary, the extended leveling portion is configured to be held in the extended posture and the non-use posture by switching the biasing force of the tension coil spring. Since it is pushed up by the pressing force from the soil and rotates, there is a possibility that it will become a non-use posture, so the extended leveling part is always urged in the direction to rotate from the non-use posture to the extended posture Then, even if the extended leveling part is pushed up by the pressing force from the soil during plowing and rotates, it is considered to be configured to return to the original extended posture.
However, if the extended leveling portion is always biased in the direction of rotating from the non-use posture to the extended posture, the biasing force that biases the extended leveling portion as the extended leveling portion is changed from the extended posture to the non-use posture. Therefore, there is a problem that the operating force of the operating member gradually increases when the extended leveling portion is operated to the non-use posture by swinging the operating lever.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary that reduces the operating force of an operating member that operates an extended leveling portion.

  The technical means taken by the present invention to solve the technical problem includes a leveling portion for leveling the field on the lower end side of the rear cover covering the rear of the rotary tillage portion, and the leveling portion includes the main leveling portion, It is supported by the main leveling part so as to be freely rotatable, and by rotating, the posture can be freely changed between an extended attitude extending outward from the main leveling part in the left-right direction and a non-use attitude positioned above the main leveling part. And an extended leveling portion biased in a direction to rotate from a non-use posture to an extended posture, and an operation member for changing the posture of the extended leveling portion, and substantially the entire operation range of the operation member Assist means for assisting the operation of the operation member so that the operation force is substantially uniform is provided.

  In addition, another technical means includes a leveling unit for leveling the field on the lower end side of the rear cover that covers the rear of the rotary tillage unit, and the leveling unit is rotatably supported by the main leveling unit and the main leveling unit. By rotating, the posture can be freely changed between an extended posture extending outward in the left-right direction from the main leveling portion and a non-use posture positioned above the main leveling portion, and the posture can be changed from the non-use posture to the extended posture. An extended leveling portion biased in the moving direction, and an operation member operated from the non-operation position to the operation position so as to change the posture of the extended leveling portion from the extended posture to the non-use posture. An assist spring is provided to urge the operation member in a direction to operate from the non-operation position to the operation position in order to reduce the operation force of the member, and the urging force acting on the operation member by the assist spring does not operate the operation member. Control from position to operating position Characterized in that it is configured to be gradually large as it.

In addition, another technical means includes a leveling unit for leveling the field on the lower end side of the rear cover that covers the rear of the rotary tillage unit, and the leveling unit is rotatably supported by the main leveling unit and the main leveling unit. By rotating, the posture can be freely changed between an extended posture extending outward in the left-right direction from the main leveling portion and a non-use posture positioned above the main leveling portion, and the posture can be changed from the non-use posture to the extended posture. An extended leveling portion biased in the moving direction, and an operation member for changing the posture of the extended leveling portion from the extended posture to the non-use posture by swinging from the non-operation position to the operation position. An assist spring is provided in which one end side is hooked to the operation member and the other end side is hooked to the machine frame side of the rotary so as to bias the member in a swinging direction from the non-operation position to the operation position. is the operating position from the non-operation position of the operating member It acts biasing force against the operating member in the entire operating range that, and, by swinging to the operating position of the operating member from the non-operation position, the biasing force acting on the operating member by the assist spring gradually as will be large, and wherein the benzalkonium away from the swing fulcrum of the operating member.

  In addition, another technical means includes a leveling unit for leveling the field on the lower end side of the rear cover that covers the rear of the rotary tillage unit, and the leveling unit is rotatably supported by the main leveling unit and the main leveling unit. By rotating, the posture can be freely changed between an extended posture extending outward in the left-right direction from the main leveling portion and a non-use posture positioned above the main leveling portion, and the posture can be changed from the non-use posture to the extended posture. An extended leveling portion biased in the moving direction, and an operation member for changing the posture of the extended leveling portion from the extended posture to the non-use posture by swinging from the non-operation position to the operation position. Provided with an assist spring having one end hooked to the operating member and the other end hooked to the rotary machine frame side so as to urge the member in a swinging direction from the non-operating position to the operating position. Spring force of the assist spring when it is in the operating position P1, the spring force of the assist spring when the operating member is located at the operating position is P2, and the distance between the axis of the assist spring when the operating member is located at the operating position and the swing fulcrum of the operating member is A, When the distance between the axis of the assist spring and the swing fulcrum of the operating member when the operating member is in the non-operating position is B, A × P2> B × P1.

  Further, the assist spring is preferably located in the vicinity of the swing fulcrum of the operation member when the operation member is located at the non-operation position.

  According to the present invention, it is possible to reduce the operating force of the operating member when operating the extended leveling portion from the extended posture to the non-use posture.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 2, reference numeral 1 denotes a rotary 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 1 has a support arm 3 projecting from the center gear case 2 to the left and right, and fixes the upper portion of the transmission case 4 to the outer end of the one support arm 3 in the left-right direction. The machine frame 5 is mainly configured in a gate shape with the upper part of the side frame fixed to the outer end side.

A top mast 6 is fixed to the gear case 2 of the machine frame 5 so as to project upward, and the top mast 6 is formed in a forked shape in the front and rear. A top of the front mast 6 a has a three-point link mechanism. The upper attachment part 7 attached to the upper part of the connection frame connected with the rear end side of the top link or 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 mounting bracket 8 attached to the lower end of the connecting frame connected to the rear end side of the lower link of the three-point link mechanism or the rear end side of the three-point link mechanism. It has been.

Further, a lower part of the machine frame 5 is provided with a claw shaft 9 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 9. A rotary tiller 11 having a tillage claw 10 is provided.
The gear case 2 of the machine frame 5 is provided with a PIC shaft 12 to which power is transmitted from the PTO shaft of the tractor via the drive shaft. The power transmitted to the PIC shaft 12 is transmitted to the power transmission in the gear case 2. It is configured to be transmitted to the claw shaft 9 through the mechanism, the transmission shaft in the support arm 3 and the power transmission mechanism in the transmission case 4, and the claw shaft 9 is driven to rotate in the direction of arrow F, for example. Yes.

The rotary 1 is provided with a rotary cover 13 that covers the rotary tiller 11. The rotary cover 13 includes an upper cover 14 that covers the top of the rotary tiller 11 and a rear cover that covers the rear of the rotary tiller 11. 15 and a side cover 16 that covers both the left and right sides of the rear portion of the rotary tiller 11.
The upper cover 14 is attached and fixed to the transmission case 4 and the side frame at the ends in the left-right direction.
The rear cover 15 is pivotally supported on the rear end side (machine frame 5 side) of the upper cover 14 so as to be rotatable about the axis of a support shaft 17 having a horizontal axis, and can swing up and down. The main cover 18 is supported on the upper side, and the sub cover 19 is detachably attached to the lower end side of the main cover 18.

The side cover 16 is attached to the transmission case 4 or the side frame.
Further, the machine frame 5 is provided with a support frame 21 to which the left and right gauge wheels 20 are attached. The support frame 21 is pivotally supported at the front end side on the machine frame 5 side, and can swing up and down. The left and right gauge wheels 20 are provided on the rear end side of the support frame 21, and the height between the support frame 21 and the top mast 6 can be expanded and contracted to adjust the vertical swing position of the support frame 21. A height adjusting device 22 is provided.
Further, in the rotary 1, a pair of left and right lowering devices 23 that urge the lower end side of the rear cover 15 downward (in the grounding direction) are provided across the machine frame 5 and the rear cover 15.

As shown in FIGS. 2 and 3, at the lower rear side of the main cover 18, a mounting portion 24 fixed to the reinforcing member 26 provided on the rear surface of the main cover 18 from the upper part to the lower part by welding or the like. Are provided in a pair on the left and right.
The sub cover 19 includes a pair of left and right attached portions 29 that are detachably attached to the left and right attachment portions 24 of the main cover 18, and a leveling portion 30 that is detachably attached to the left and right attached portions 29. The leveling portion 30 includes a main leveling portion 31 that substantially corresponds to the left and right width of the main cover 18, and extended leveling portions 32 disposed on both the left and right sides of the main leveling portion 31.

The extended leveling portion 32 is freely changeable in posture (openable and closable) from an extended posture protruding outward in the left-right direction from the main leveling portion 31 and a non-use posture positioned on the upper side of the main leveling portion 31 from this extended posture. And it is always urged | biased in the direction (opening direction) rotated from a non-use attitude | position to an extended attitude | position.
Further, the extended leveling portion 32 is extended and not used by swinging an operation lever (operation member) 34 supported so as to be swingable by a support bracket 33 attached to the rear portion 6b of the top mast 6. The operation lever 34 can be gripped from the driver seat side of the tractor by raising the rotary 1, so that the extended leveling portion 32 can be remotely controlled from the driver seat of the tractor. It can be operated.

The leveling portion 30 is formed in a groove shape whose upper surface is open upward, and the groove portion on the upper surface side of the main leveling portion 31 is filled with a hollow resin product. The float 55 is configured such that mud or the like is not clogged by the float 55 on the upper surface side of the main leveling portion 31.
As shown in FIGS. 9 to 11, fixed brackets 36 are provided on the left and right ends of the main leveling portion 31, and the left and right extended leveling portions 32 have axial centers orthogonal to the fixed bracket 36 in the left-right direction. An oscillating bracket 38 supported rotatably through a support shaft 37 is provided, and an extended leveling portion 32 is supported by the main leveling portion 31 so as to be rotatable around the support shaft 37. As the leveling portion 32 rotates around the support shaft 37, the extended leveling portion 32 can be freely changed between an extended posture and a non-use posture.

The fixing bracket 36 extends upward from the front and rear end edges of the mounting wall 41 and a mounting wall 41 fixed by bolts 40 on a pair of front and rear mounting stays 39 provided on the upper surface side of the main leveling portion 31. And a pair of support walls 42 provided in a front-rear facing manner.
The swing bracket 38 is provided in a pair of front and rear with respect to each extended leveling portion 32, a fixed portion 43 fixed to the upper surface side of the extended leveling portion 32, and extends upward from the fixed portion 43 and in the left-right direction. And an arm portion 44 extending toward the side.

The inner side in the left-right direction of the arm portion 44 of the front swing bracket 38 is positioned on the front side of the front support wall 42 of the fixed bracket 36, and the inner side in the left-right direction of the arm portion 44 of the rear swing bracket 38 is fixed. Since the support shaft 37 is located behind the support wall 42 on the rear side of the bracket 36 and passes through the arm portion 44 of the front and rear swing brackets 38 and the front and rear support walls 42 of the fixed bracket 36. The swing bracket 38 is supported by the fixed bracket 36 so as to be rotatable around the support shaft 37.
A washer 45 is sandwiched between the swing bracket 38 and the support wall 42 of the fixed bracket 36 to reduce the frictional resistance between the swing bracket 38 and the fixed bracket 36.

A rotating member 46 made of a plate material is disposed on the inner side in the opposite direction of the support wall 42 on the front side of the fixed bracket 36. The rotating member 46 is externally fitted to the support shaft 37 so as to be rotatable around the axis. The front end side of the cylindrical shaft 47 is fixed, and the cylindrical member 47 supports the rotating member 46 so as to be rotatable around the axis of the support shaft 37 and prevents the rotating member 46 from falling down. .
A guide cylinder 48 is provided between the rotating member 46 and the rear support wall 42 so as to cover the rear side of the support shaft 37 and the cylinder shaft 47. A disc-shaped rear support wall 49 is provided so as to close the opening on the end side, and a disc-shaped front support wall 50 is inserted and fixed on the front side of the guide tube 48.

An insertion hole 51 is formed at the center of the front and rear support walls 49, 50, and the support shaft 37 is inserted into the insertion hole 51, so that the guide cylinder 48 is rotatable about the axis of the support shaft 37. It is supported.
The front support wall 50 is in contact with the cylindrical shaft 47, and the rear support wall 49 is in contact with the support wall 42 on the rear side of the fixed bracket 36, thereby rotating between the support walls 42 of the fixed bracket 36. The member 46 and the guide cylinder 48 are positioned.
The guide cylinder 48 is fitted with a biasing member 52 made of a torsion coil spring or the like. One end of the torsion coil spring 52 is connected to a spring hook 53 provided on the support wall 42 on the front side of the fixed bracket 36. The other end side of the torsion coil spring 52 is hooked on the arm portion 44 of the rear swing bracket 38, and the extension leveling portion 32 is always extended from the non-use posture by the urging force of the torsion coil spring 52. It is biased in the direction of turning to the posture.

As a result, even if the extended leveling portion 32 is pressed by the external force (reaction force) from the ground and rotated to the non-use posture side in the extended posture, the external force does not act and returns to the original extended posture. The extended leveling portion 32 is configured not to be in a non-use posture.
Further, in the extended posture, the extended leveling portion 32 rotates in the direction of rotating from the non-use posture to the extended posture by contacting the inner end side in the left-right direction with the outer end side in the left-right direction of the main leveling portion 31. It is comprised so that operation | movement may be controlled.
A mounting pin 54 is provided below the rotating member 46 so as to protrude rearward from the front side. One end of the operation wire 55, specifically, a Bowden wire ( Alternatively, one end side of the inner wire 56 of the push-pull wire 55 is connected via a connecting member 57 so as to be relatively rotatable about the axis of the mounting pin 54.

One end side of the outer wire 58 of the operation wire 55 is attached to the outer receiving portion 59 provided on the support wall 42 on the front side of the fixed bracket 36 via the attachment mechanism 60 so that the position thereof can be adjusted in the length direction.
In addition, a wire guide 80 that is formed in a substantially arc shape centering on the support shaft 37 and guides the inner wire 56 is provided on the upper portion of the rotating member 46.
In addition, the lower end portion of the rotating member 46 is provided with a pushing portion 62 that contacts the contact member 61 provided in the extended leveling portion 32 when the extended leveling portion 32 is in the extended posture. .

In the above configuration, when the extended leveling portion 32 is in the extended posture, the inner wire 56 is wound around the outer peripheral side of the wire guide 80, and when the other end side of the inner wire 56 is pulled from this state. Since one end side of the inner wire 56 is connected to the rotating member 46, the rotating member 46 rotates around the axis of the support shaft 37 in a direction in which the extended leveling portion 32 rotates from the extended posture to the non-use posture. Move.
When the rotating member 46 is rotated, the pushing portion 62 presses the contact member 61 of the extended leveling portion 32, whereby the extended leveling portion 32 rotates from the extended posture to the non-use posture (extended leveling portion). 32 is closed).

Further, when the tensile force applied to the extended leveling portion 32 by the inner wire 56 is released from the non-use posture, the extended leveling portion 32 is rotated to the original extended posture by the biasing force of the biasing member 52.
Note that even if the extended leveling portion 32 is rotated in a direction to rotate from the extended posture to the non-use posture due to an external force from the ground, only the extended leveling portion 32 rotates and the rotating member 46 does not rotate. .
Further, the rear cover 15 is not provided with the sub-cover 19, the rear cover 15 is composed only of the main cover 18, and notches are formed on both the left and right sides of the lower end side of the main cover 18, and the notches are closed. In addition, when the main cover 18 has a closing cover that is removed when a double earthenware or the like is attached to the rotary, the extended leveling portion 32 is provided on the closing cover.

Further, when the rear cover 15 is composed only of the main cover 18 and the closing cover is not provided (the notch portion is not provided), the extended leveling portion 32 is a side portion of the main leveling portion 31 below the main cover 18. It is attached to the pivotable.
As shown in FIGS. 1 and 4 to 8, a pair of left and right operating levers 34 for operating the extended leveling section 32 and a support bracket 33 for supporting the operating lever 34 are provided corresponding to the left and right extended leveling sections 32. The top mast 6 is disposed on both the left and right sides of the rear portion 6b of the top mast 6 so as to sandwich the rear portion 6b.

The top mast 6 is configured by connecting a pair of left and right plate members 63 with a connecting member 64, and the support bracket 33 is a mounting wall 65 disposed on the outer side in the left and right direction of the top mast 6 and spaced in the left and right direction. And a guide plate portion 66 extending inward in the left-right direction from the rear side edge portion of the mounting wall 65.
The upper and lower portions of the front side of the mounting wall 65 of each of the left and right support brackets 33 are arranged between the mounting wall 65 and the mounting wall 65 and the plate material 63 constituting the top mast 6 facing the mounting wall 65. 69 and a plate material 63 constituting the top mast 6, and a bolt 67 is inserted from the laterally outward side, and a nut 68 is screwed to the tip side of the bolt 67 to tighten the nut 68. The plate material 63 constituting the top mast 6 is attached to the plate material 63 at intervals in the left-right direction.

An insertion portion 70 provided on the base end side of the operation lever 34 is externally fitted to the collar 69 of the lower mounting portion of the support bracket 33 so as to be rotatable about the axis of the bolt 67 and the collar 69. As a result, the operation lever 34 is supported by the support bracket 33 so as to be swingable up and down around the horizontal axis, and the bolt 67 or the collar 69 serves as a support shaft for supporting the operation lever 34. The axis of the bolt 67 and the collar 69 serves as the swing fulcrum Z of the operation lever 34.
Further, rubber bushes 71 fitted to the collar 69 are provided on both the left and right sides of the base end side of the operation lever 34. The rubber bushes 71 are provided on the operation lever 34, the mounting wall 65 of the support bracket 33, and the top mast 6. Is located between the base plate 63 of the operation lever 34, and only the elastic deformation of the rubber bush 71 or the elastic deformation of the rubber bush 71 is provided. Further, the grip 72 side of the operation lever 34 can be elastically swung left and right by the bending of the operation lever 34 and the like.

A mounting hole 73 is formed in the middle portion of the operation lever 34 in the length direction, and a mounting bracket 74 provided on the other end side of the inner wire 56 is inserted into the mounting hole 73, thereby The other end side is detachably attached to the operation lever 34.
Therefore, when the extended leveling portion 32 is in the extended posture, the operation lever 34 is pulled by the inner wire 56 to a position where the operation lever 34 swings downward. From this position, the grip 72 of the operation lever 34 is gripped and the operation lever 34 is moved. By pulling up (pivoting upward), the extended leveling portion 32 is pulled by the inner wire 56 and rotated to the non-use posture against the biasing member 52 (the extended leveling portion 32 is operated remotely). )

As shown in FIG. 5, guide grooves 75 formed in the operation direction of the operation lever 34 are formed in the guide plate portions 66 of the left and right support brackets 33, and the operation lever 34 is inserted through the guide grooves 75. The operation lever 34 can swing up and down within a predetermined range along the guide groove 75.
A locking groove 76 that locks the operation lever 34 at a predetermined position is formed in the guide groove 75 in a continuous manner on the inner side in the left and right direction of the upper and lower portions of the guide groove 75.
The guide plate portion 66 is provided with upper and lower restricting portions 77 for restricting the movement of the operation lever 34 from the upper and lower engaging grooves 76 to the guide grooves 75 corresponding to the upper and lower engaging grooves 76. .

When the operation lever 34 is in the upper locking groove 76, as indicated by a virtual line Y in FIG. 5, the operation lever 34 is in contact with the lower end side of the upper locking groove 76, and below the operation lever 34. The movement is restricted and the extended leveling portion 32 is held in a non-use posture.
In this state, the upper restricting portion 77 restricts the movement of the upper portion of the operation lever 34 in the left-right direction.
The position where the operation lever 34 is locked in the upper locking groove 76 is an operation position (non-use posture operation position) Y where the extended leveling portion 32 is operated to the non-use posture.

When the extended leveling portion 32 is changed from the non-use posture to the extended posture, the operation lever 34 is lifted to the upper side from the upper restriction portion 77 from the state of being locked in the upper locking groove 76, and then the operation lever 34 is moved. The operation lever 34 is allowed to move downward by tilting it inward in the left-right direction against the elastic force of the rubber bush 71 and the like, so that the operation lever 34 is allowed to move downward. By swinging, the extended leveling portion 32 can be set to the extended posture.
When the extended leveling portion 32 is changed from the extended posture to the non-use posture, the reverse operation is performed.
A spring hooking hole 78 is provided in the middle in the length direction of each of the left and right operation levers 34 and on the front side of the guide plate portion 66, and on the front end side of the mounting wall 65 of the left and right support bracket 33 and the swing fulcrum Z of the operation lever 34. On the upper side, a spring hooking portion 79 made of a pin or the like is provided so as to project inward in the left-right direction from the mounting wall 65.

Further, the rotary 1 is provided with assist means (assist spring) 81 including a spring or the like for assisting the operation of the operation lever 34.
The assist spring 81 is composed of a tension coil spring and is positioned above the swing fulcrum Z of the operation lever 34. One end of the assist spring 81 is hooked on the spring hooking hole 78 of the operation lever 34, and the other end is supported by the support bracket. 33, and is urged by the assist spring 81 in the direction in which the operation lever 34 swings upward (the direction in which the operation lever 34 swings to the operation position Y). .

Note that the urging force of the urging member 52 that rotates the extended leveling portion 32 to the extended posture is larger than the urging force that swings the operation lever 34 by the assist spring 81.
Further, when the extended leveling portion 32 is in the extended posture and the operation lever 34 is in the guide groove 75, the operation lever 34 has the upper end side of the restriction portion 77 as shown by the phantom line D in FIG. 5. In this state, after the operating lever 34 is pushed down below the lower restricting portion 77, the upper portion of the operating lever 34 is moved in the left-right direction to lower the lower locking groove 76. Then, the operating lever 34 is released by the biasing force acting on the operating lever 34 by the assist spring 81 as shown by a solid line in FIG. The operating lever 34 contacts and is positioned (locked) on the upper end side.

Therefore, at the position where the operation lever 34 is locked in the lower locking groove 76, the urging force by the assist spring 81 does not act on the extended leveling portion 32.
The position where the operation lever 34 is locked in the lower locking groove 76 or the position indicated by the phantom line D is a non-operation position (extended posture operation position) X in which the extended leveling portion 32 is in the extended posture. ing.
When the operation lever 34 is pushed down from the state in which the extended leveling portion 32 is in the extended posture, the inner wire 56 is bent and the downward movement of the operation lever 34 is allowed.
As shown in FIG. 1, the assist spring 81 is close to the swing fulcrum Z of the operation lever 34 when the operation lever 34 is in the non-operation position X, and is operated by the spring force P <b> 1 of the assist spring 81. 5 is small (when the operating lever 34 is at the position indicated by the phantom line D in FIG. 5, the biasing force by the assist spring 81 is small), and the operating lever 34 is swung from the non-operating position X to the operating position Y. As the assist spring 81 gradually moves away from the swing fulcrum Z, the spring force of the assist spring 81 gradually decreases, but the biasing force acting on the operation lever 34 by the spring force of the assist spring 81 gradually increases. It is configured to be large.

The urging force acting on the operation lever 34 by the spring force of the assist spring 81 is a moment around the swing fulcrum Z by the spring force, and the spring force of the assist spring 81 and the assist spring 81 from the swing fulcrum Z. This is the product of the length of the perpendicular line down to the line of action of the spring force (the distance between the axis R of the assist spring 81 and the swing fulcrum Z of the operating lever 34).
Therefore, the spring force P2 of the assist spring 81 when the operation lever 34 is located at the operation position Y, the axis R of the assist spring 81 when the operation lever 34 is located at the operation position Y, and the swing fulcrum Z of the operation lever 34 The product (A × P2) of the distance A to the spring force P1 of the assist spring 81 when the operation lever 34 is located at the non-operation position X and the assist when the operation lever 34 is located at the non-operation position X. It is larger than the product (B × P1) of the distance B between the axis R of the spring 81 and the swing fulcrum Z of the operation lever 34.

As a result, the urging force of the urging member 52 that urges the extended leveling portion 32 gradually increases as the extended leveling portion 32 rotates from the extended posture to the non-use posture. Since the applied urging force gradually increases, the operation force of the operation lever 34 is reduced.
The amount of urging force that urges the operation lever 34 in the direction of swinging from the non-operation position X to the operation position Y increases as the operation lever 34 swings from the non-operation position X to the operation position Y. By responding to the increase in the urging force of the urging member 52 that urges the extended leveling portion 32 as the portion 32 rotates from the extended posture to the non-use posture, substantially over the entire operation range of the operation lever 34. It is preferable that the operation force of the operation lever 34 is substantially uniform, but the operation force of the operation lever 34 may gradually increase over substantially the entire operation range of the operation lever 34. It is only necessary that the operation force of the operation lever 34 is reduced as compared with the case where the assist spring 81 is not provided.

On the lower end side of the guide plate portion 66 of each of the left and right support brackets 33, a holder attaching portion 84 for detachably attaching a wire holder 83 that locks the other end side of the outer wire 58 of the operation wire 55 is provided. .
The wire holder 83 includes a holder main body 85 and a pair of left and right wire attachment members 86.
The holder main body 85 is formed in a bar shape that is long in the left-right direction, and attached portions 87 that are respectively attached to and supported by the holder attaching portions 84 of the left and right support brackets 33 are provided on the left and right sides of the holder main body 85. A groove portion 88 is formed along the longitudinal direction in the middle portion in the longitudinal direction.

The wire attaching member 86 passes through the side portion of the holder body 85 in the left-right direction so as to reach the groove portion 88 from the outer side surface in the left-right direction, and is supported by the side portion of the holder body 85 so as to be rotatable about the axis in the left-right direction. The shaft portion 89 and the other end side of the outer wire 58 have an attachment portion 90 that is attached and fixed so that its position can be adjusted in the axial direction (length direction).
The shaft portion 89 is prevented from being detached from the holder main body 85 by inserting a pin 91 into the shaft portion 89 in the groove portion 88.
The attached portion 87 is formed in a shape formed by cutting (cut out) a cylindrical member having a horizontal axis in a pair of planes parallel to the axial direction and parallel to each other. The side 92 has a straight shape and the short side 93 has an arc shape. The distance S between the long sides 92 is smaller than the distance T between the short sides 93.

Further, the holder main body 85 is positioned in the left-right direction by interposing between the attached portions 87 between the left and right holder attaching portions 84.
The holder attaching portion 84 has a circular support hole 94 that supports the attached portion 87 of the wire holder 83, and an insertion portion 95 that inserts and removes the attached portion 87 with respect to the support hole 94.
The width U of the insertion portion 95 is formed to be larger than the distance S between the long sides 92 and smaller than the distance T between the short sides 93, and the distance T between the diameter V of the support hole 94 and the short sides 93. Are substantially the same (V> T).

In this wire holder 83, the attached portion 87 is inserted into the support hole 94 from the insertion portion 95 of the holder attaching portion 84 and attached to the holder attaching portion 84. At this time, as shown in FIG. By aligning the long side 92 with the direction along the insertion direction W, the attached portion 87 can be inserted into the support hole 94 from the insertion portion 95, and the holder body 85 is inserted after the attached portion 87 is inserted into the support hole 94. By rotating around the left and right axis, the attached portion 87 is prevented from coming off from the support hole 94, and the wire holder 83 can be easily attached and detached.
The attachment / detachment of the wire holder 83 is preferably performed in a state where the operation lever 34 is locked in the lower locking groove 76, that is, in a state where no tension is applied to the operation wire 55 inner wire 56.

Further, when the sub cover 19 of the rear cover 15 is removed from the main cover 18, the other end side of the inner wire 56 is removed from the operation lever 34 and the wire holder 83 is removed, so that the sub cover 19 can be easily removed (attached). .
The rotary 1 having the above-described configuration is mounted on the rear portion of the tractor through a three-point link mechanism so as to be movable up and down, and by raising the rotary 1, the operation lever 34 can be gripped from the driver seat side of the tractor. The extension leveling section 32 can be operated to change the posture from the driver's seat side.

Further, as a tractor, there is a tractor having a cabin mounted on a vehicle body. When the rotary 1 is mounted on the tractor with a cabin, when the rotary 1 is raised, the operation lever 34 hits the rear glass of the cabin and breaks the rear glass. There is a case to let you.
In other words, the rear glass of the cabin is supported by the hinge so as to be pivotable about the left and right axis, and is swingable up and down, so that it can be opened and closed. In this case, the operation lever 34 is designed so that it does not touch. However, if the rear glass can be held in the middle (half-opened state) between the closed position and the open position, If the rotary 1 is raised while being held in the middle, the operation lever 34 may hit the rear glass of the cabin.

Therefore, when the rotary 1 is raised, as shown in FIGS. 12 and 13, when the operation lever 34 hits the rear glass or the like, the operation lever 34 is raised when the rotary 1 is raised as shown in FIGS. When an external force is applied to the operation lever 34 by hitting the rear glass or the like, the operation lever 34 is preferably broken in the middle so that the rear glass is not damaged.
As shown in FIGS. 12 and 13, the operation lever 34 includes a base side portion 34 a and a grip side portion 34 b, and the base side portion 34 a and the grip side portion 34 b are arranged in the left-right direction via a support shaft 96. Are pivotally connected to each other around the shaft center, and when an external force is applied to the grip side portion 34b from the front side, the grip side portion 34b is rotated to the rear side around the support shaft 96. ing.

A lower end side of the base side portion 34a is pivotably supported, and a mounting hole 73 of the inner wire 56 and a spring hooking hole 78 of the assist spring 81 are formed in the base side portion 34a.
An open groove 97 is formed on the lower side of the grip side portion 34b on the front side and the lower side. The upper end side 100 of the base side portion 34a is inserted into the groove 97, and the upper end side of the base side portion 34a. 100 and the groove forming portion of the grip side portion 34 b are pivotally connected by the support shaft 96.

Further, the grip side portion 34b has at least a groove forming portion 98 formed of an elastic member made of resin or the like. A stopper 99 is provided on the upper part of the back side of the groove forming portion 98 of the grip side portion 34b. As shown in (a), in a state where the grip side portion 34b and the upper end side 100 of the base portion 34a are linear, the stopper portion 99 is in surface contact with the back surface 100a of the upper end side 100 of the base portion 34a. Thus, the grip side portion 34b is prevented from turning forward so that the operation lever 34 does not bend in the direction of operation from the non-operation position X to the operation position Y.

Further, a protrusion 101 bulging inward in the left-right direction is formed on the upper front side of the inner surface of the groove 97, and the grip side portion 34b and the upper end side 100 of the base side portion 34a are linear. In this state, the protrusion 101 contacts the upper end edge 100b of the base side portion 34a, so that the rearward rotation of the grip side portion 34b is restricted. In order to change the position from the position indicated by the phantom line D to the position indicated by the solid line, the operation lever 34 is not broken when the operation lever 34 is pushed down.
Further, when a large external force is applied to the grip side portion 34b from the front side, the protrusion 101 is pressed against the upper end edge 100b of the base side portion 34a, and the left and right side walls 98a of the groove forming portion 98 are elastically expanded. The side portion 34b is allowed to rotate rearward, and as shown in FIG. 13B, the upper portion of the operation lever 34 is configured to be folded into a square shape.

Further, when the lower surface 99a of the stopper 99 comes into contact with the back surface 100a of the upper end side 100 of the base side portion 34a, the rearward rotation of the grip side portion 34b is restricted, and the protruding portion 101 becomes the base side portion 34a. By engaging with the back surface 100a, the operation lever 34 is held in a folded state.
If the grip 72 is gripped from this state and the operation lever 34 is pulled upward, the upper side of the operation lever 34 is in the original linear state by the reverse operation.
In addition, when an external force is applied to the grip side portion 34b from the front side, the connecting portion between the base side portion 34a and the grip side portion 34b of the operation lever 34 may be damaged.

  In the present embodiment, the side drive type rotary 1 is illustrated as the rotary 1, but a center drive type rotary 1 or the like may be adopted. Also,

It is a side view of the principal part of this invention. It is a side view of a rotary. It is a top view of a rotary cover lower part. It is a side view of the attachment part of an operation lever. It is the figure which looked at the attachment part of the operation lever from the back side. It is sectional drawing which looked at the attachment part of the operation lever from the back side. It is sectional drawing of a wire holder. It is a side view which shows attachment of a wire holder. It is a back surface sectional view of the attachment part of an extension leveling part. It is side surface sectional drawing of the attachment part of an extended leveling part. It is a plane sectional view of the attachment part of an extension leveling part. It is a side view which shows the modification of an operation lever. (A), (b) is sectional drawing of the E section of FIG. 12, (c) is GG arrow sectional drawing of (a).

Explanation of symbols

5 Machine frame 11 Rotary tilling part 15 Rear cover 30 Leveling part 31 Main leveling part 32 Extension leveling part 34 Operation lever (operation member)
81 Assist spring (assist means)
A Distance between the axis of the assist spring when the operation member is in the non-operation position and the swing support point of the operation member B B. Support axis of the assist spring and the swing support of the operation member when the operation member is in the non-operation position Distance P1 The spring force of the assist spring when the operating member is in the non-operating position P2 The spring force of the assist spring when the operating member is in the non-operating position X Non-operating position Y Operating position Z Swing fulcrum

Claims (5)

  A leveling part (30) for leveling the field is provided on the lower end side of the rear cover (15) covering the rear of the rotary tillage part (11). The leveling part (30) includes a main leveling part (31) and the main leveling part ( 31) is supported in a freely rotatable manner by rotating to an extended posture extending outward in the left-right direction from the main leveling portion (31) and a non-use posture positioned above the main leveling portion (31). And an extended leveling portion (32) biased in a direction to rotate from a non-use posture to an extended posture, and an operation member for changing the posture of the extended leveling portion (32) (32) 34) and assist means (81) for assisting the operation of the operation member (34) so that the operation force is substantially uniform over substantially the entire operation range of the operation member (34). Rotary to do. A leveling part (30) for leveling the field is provided on the lower end side of the rear cover (15) covering the rear of the rotary tillage part (11). The leveling part (30) includes a main leveling part (31) and the main leveling part ( 31) is supported in a freely rotatable manner by rotating to an extended posture extending outward in the left-right direction from the main leveling portion (31) and a non-use posture positioned above the main leveling portion (31). And an extended leveling portion (32) biased in a direction to rotate from a non-use posture to an extended posture, and the extended leveling portion (32) is changed from an extended posture to a non-use posture. An operation member (34) operated from the non-operation position (X) to the operation position (Y) so as to be changed is provided, and the operation member (34) is not operated to reduce the operation force of the operation member (34). a for biasing in the direction of operation position from (X) to the operating position (Y) Sutobane (81) is provided, and gradually large as it operated in the operation position biasing force operating member which acts on the operating member (34) by the assist spring (81) and (34) from the non-operation position (X) (Y) It is comprised so that it may become. Rotary characterized by the above-mentioned. A leveling part (30) for leveling the field is provided on the lower end side of the rear cover (15) covering the rear of the rotary tillage part (11). The leveling part (30) includes a main leveling part (31) and the main leveling part ( 31) is supported in a freely rotatable manner by rotating to an extended posture extending outward in the left-right direction from the main leveling portion (31) and a non-use posture positioned above the main leveling portion (31). An extended leveling portion (32) biased in a direction to change the posture and rotate from a non-use posture to an extended posture, and swings from the non-operation position (X) to the operation position (Y). Is provided with an operation member (34) for changing the position of the extended leveling part (32) from the extended position to the non-use position, and the operation member (34) is swung from the non-operation position (X) to the operation position (Y). One end is hooked to the operating member (34) so as to urge in the moving direction, and the other end The rotary machine casing (5) provided the assist spring (81) which is hooked to the side, the assist spring (81), the operation reaches the operating position from the non-operation position of the operating member (34) (X) (Y) A biasing force is applied to the operation member (34) in the entire range, and the operation member (34) is swung from the non-operation position (X) to the operation position (Y), thereby the assist spring. as the biasing force acting on the operating member (34) by (81) is gradually large, rotary, wherein the benzalkonium away from the swing fulcrum of the operating member (34) (Z).
A leveling part (30) for leveling the field is provided on the lower end side of the rear cover (15) covering the rear of the rotary tillage part (11). The leveling part (30) includes a main leveling part (31) and the main leveling part ( 31) is supported in a freely rotatable manner by rotating to an extended posture extending outward in the left-right direction from the main leveling portion (31) and a non-use posture positioned above the main leveling portion (31). An extended leveling portion (32) biased in a direction to change the posture and rotate from a non-use posture to an extended posture, and swings from the non-operation position (X) to the operation position (Y). Is provided with an operation member (34) for changing the position of the extended leveling part (32) from the extended position to the non-use position, and the operation member (34) is swung from the non-operation position (X) to the operation position (Y). One end is hooked to the operating member (34) so as to urge in the moving direction, and the other end Is provided on the machine frame (5) side of the rotary, and the spring force of the assist spring (81) when the operation member (34) is in the non-operation position (X) is P1, The spring force of the assist spring (81) when the operation member (34) is located at the operation position (Y) is P2, and the assist spring (81) when the operation member (34) is located at the operation position (Y). The distance between the axis (R) and the swing fulcrum (Z) of the operating member (34) is A, and the axis (R) of the assist spring (81) when the operating member (34) is in the non-operating position (X). ) And the swinging fulcrum (Z) of the operating member (34), where B is A × P2> B × P1.   The assist spring (81) is positioned in the vicinity of the swing fulcrum (Z) of the operating member (34) when the operating member (34) is positioned at the non-operating position (X). The rotary according to 4.

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