JP2018191657A - Agricultural implement - Google Patents

Abstract

To provide an agricultural implement capable of reducing a load of an operator.SOLUTION: An agricultural implement 1 includes a machine body 2 connected to the rear of a tractor, a tillage body for performing a tillage work, and a soil preparation body 4 for performing a soil preparation work on the rear of the tillage body. The agricultural implement 1 also includes lift assist means 8 for assisting lift of the soil preparation body 4. In the lift assist means 8, one side is mounted on the machine body 2 side, and the other side is mounted on the soil preparation body 4 side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an agricultural machine that can reduce a burden on an operator.

  DESCRIPTION OF RELATED ART Conventionally, the agricultural working machine described in the following patent document 1, for example is known.

  This conventional farm work machine includes a machine body connected to a traveling vehicle such as a tractor, a tiller body that is rotatably provided on the machine body and performs a tilling work while rotating, and a tiller that is provided on the machine body so as to be rotatable in the vertical direction. A leveling body that performs leveling work behind the body and a stopper device that locks the leveling body at the highest position are provided.

JP 2005-218316 A

  However, in the conventional farm work machine, for example, when performing maintenance such as nail replacement of a tillage body or cleaning of a leveling body, an operator needs to lift a relatively heavy leveling body, and it takes time to lift the leveling body. There is a fear.

  This invention is made | formed in view of such a point, and it aims at providing the agricultural machine which can reduce a worker's burden.

  The agricultural machine according to claim 1 is a machine body connected to a traveling vehicle, a tiller body provided on the machine body for plowing work, a leveling body for ground leveling work behind the plowing body, and a lifting assist A lifting assist means for assisting lifting of the leveling body by using a biasing force of the biasing body, and one side of the lifting assist means is attached to the machine body side. And the other side is attached to the leveling body side.

  The agricultural machine according to claim 2 is the agricultural machine according to claim 1, wherein the lifting assist means includes a long body and a movable body movable relative to the long body.

  The agricultural machine according to claim 3 is the agricultural machine according to claim 2, wherein the lifting assist means has a rotating body rotatably provided on the leveling body, and the moving body is It moves based on the urging force of the urging body together with the rotating body.

  The agricultural machine according to claim 4 is the agricultural machine according to any one of claims 1 to 3, wherein the lifting assist means can be switched between an assist-off state and an assist-on state by operating the operation member. It is.

  The farm machine according to claim 5 is the farm machine according to any one of claims 1 to 4, wherein at least a part of the urging body is accommodated in the lifting assist means.

  The agricultural machine according to claim 6 is the agricultural machine according to any one of claims 1 to 5, wherein the biasing body is a gas spring.

  The agricultural machine according to claim 7 is the agricultural machine according to any one of claims 1 to 6, wherein one side of the lifting assist means is attached to an attachment portion provided on a frame of the machine body. .

  According to the present invention, since the lifting assist means assists the lifting of the leveling body, the burden on the operator can be reduced.

It is a top view of the agricultural working machine which concerns on the 1st Embodiment of this invention. It is a perspective view of an agricultural working machine same as the above. It is a perspective view at the time of leveling body raising of the agricultural working machine same as the above (at the time of maintenance). It is a side view at the time of assist-off of a farm working machine same as the above. It is a side view at the time of assist-off of a farm working machine same as the above. It is a side view at the time of the assist on of the agricultural working machine same as the above. It is a side view at the time of the assist on of the agricultural working machine same as the above. It is a front view of the lifting assistance means (assist off state) of the agricultural work machine same as the above. It is a side view of the elongate body of a lifting assistance means same as the above. It is a front view of the urging body of the lifting assist means. It is a front view of the moving body of a lift assistance means same as the above. It is a side view of the rotation body of a lifting assistance means same as the above. It is a front view of the lifting assistance means (assist off state) of the agricultural working machine which concerns on the 2nd Embodiment of this invention. It is a side view of a lifting assistance means (assist off state) same as the above. It is a front view of a lifting assistance means (assist-on state). It is a front view of the elongate body of a lifting assistance means same as the above. It is a side view of the elongate body of a lifting assistance means same as the above. It is a front view of the moving body of a lift assistance means same as the above. It is a side view of the moving body of a lifting assistance means same as the above. It is a bottom view of the moving body of a lifting assistance means same as the above. It is a front view of the rotation body of a lift assistance means same as the above. It is a side view of the rotation body of a lifting assistance means same as the above. It is a bottom view of the rotation body of a lifting assistance means same as the above. It is a side view at the time of assist-off of the agricultural working machine which concerns on the 3rd Embodiment of this invention. It is a side view at the time of assist-off of a farm working machine same as the above. It is a side view at the time of the assist on of the agricultural working machine same as the above. It is a side view at the time of the assist on of the agricultural working machine same as the above. It is a front view of the lifting assistance means (assist off state) of the agricultural work machine same as the above. (A) is an arrow a view of FIG. 28, (b) is the partial expansion part. It is a b arrow line view of FIG. It is an operation | movement figure of a lifting assistance means same as the above. It is a disassembled front view of a lifting assistance means same as the above. It is a decomposition | disassembly side view of a lifting assistance means same as the above. It is a top view of the agricultural machine based on the 4th Embodiment of this invention.

  A first embodiment of the present invention will be described with reference to FIGS.

  In the figure, reference numeral 1 denotes an agricultural machine. The agricultural machine 1 is connected to a rear portion of a tractor (not shown) that is a traveling vehicle, for example, and is cultivated while moving forward (in the traveling direction) on the field by the traveling of the tractor. It performs leveling work (agricultural work).

  The agricultural machine 1 includes a machine body 2 that is detachably connected to a three-point link part (agricultural machine lifting part) at the rear of the tractor, and a tiller that is rotatably provided on the machine body 2 and rotates in a predetermined direction. A plate-shaped leveling body (level plate) that is provided on the body (rotary) 3 and the body 2 so as to be pivotable in the vertical direction about a horizontal axis (rotation fulcrum) 5 and that performs leveling work behind the tillage body 3 4 is provided.

  Moreover, the farm work machine 1 is provided with lifting assist means 8 that assists the lifting (upward rotation) of the leveling body 4 by the operator's human power during maintenance of the tillage body 3, the leveling body 4, and the like. The lifting assist means 8 is, for example, one, and is provided between the machine body 2 and the leveling body 4 at the left position, which is one side of the farm work machine 1.

  Further, the farm work machine 1 is provided with a ground pressure adjusting means 9 for adjusting the ground pressure with respect to the farm scene of the leveling body 4 so as to correspond to the farm field state. The ground pressure adjusting means 9 is, for example, one, and is provided between the machine body 2 and the leveling body 4 at the right position, which is the other side of the farm work machine 1.

  The airframe 2 has a three-point connecting portion (traveling vehicle connecting portion) 11 that is detachably connected to a three-point link portion at the rear of the tractor. The three-point connecting portion 11 includes one top mast 12, a top pin 13 attached to the top mast 12, two lower arms 14 in a pair of left and right, and a lower pin 15 attached to each lower arm 14. It is composed of.

  The airframe 2 also has a mission case portion 17 that is a shaft holding portion that rotatably holds the input shaft 16, and inner end portions of the frame pipe portion 18 are attached to the left and right sides of the mission case portion 17. Yes. The input shaft 16 is connected to the PTO shaft of the tractor via a joint (not shown).

  A chain case portion 19 that is a box-shaped tiller support portion is attached to the outer end portion of the left frame pipe portion 18. A bracket portion 20 that is a plate-shaped tillage body support portion is attached to the outer end portion of the right frame pipe portion 18. The tiller 3 is rotatably supported by the chain case portion 19 and the bracket portion 20 that are opposed to each other. Note that a side cover plate 10 projects rearward from the chain case portion 19 and the bracket portion 20.

  Further, the machine body 2 has an upwardly convex curved plate-shaped tilling cover portion 21 that covers the upper portion of the tilling body 3. The ground leveling body 4 is attached to the rear end portion of the tillage cover portion 21 via a plurality of, for example, three hinges 22 so as to be pivotable in the vertical direction about the horizontal axis 5. A gauge wheel 30 is provided on the front side of the machine body 2 to adjust the vertical position.

  The tillage body 3 has a tilling shaft 23 in the left-right direction that is rotatably mounted between the lower part of the chain case part 19 and the lower part of the bracket part 20. That is, the left end, which is one axial end of the tilling shaft 23, is rotatably supported by the lower portion of the chain case portion 19, and the right end, which is the other axial end of the tilling shaft 23, is the lower portion of the bracket portion 20. It is supported so that it can rotate.

  The tillage shaft 23 receives power from a power transmission means (not shown) that transmits power from the input shaft 16 side to the tiller 3 and rotates in a predetermined direction. The power transmission means includes a gear in the mission case portion 17, a shaft in the frame pipe portion 18, a chain in the chain case portion 19, and the like.

  Further, at a plurality of positions spaced apart in the axial direction of the tilling shaft 23, a tilling claw 24 for performing a tilling operation while rotating in a predetermined direction integrally with the tilling shaft 23 is detachably attached. A blade portion 25 is formed on the front side of each tilling claw 24 in the rotation direction.

  The leveling body 4 has a substantially rectangular plate-shaped leveling structure that is attached to the rear end portion of the tillage cover portion 21 so as to be rotatable in the vertical direction so that the rear end side can be moved up and down about the shaft 5 on the front end side. A main body plate 26 is provided. Leveling side plates 27 are fixed to both ends of the leveling main body plate 26 in the left-right direction.

  A pair of left and right projecting plates 28 are provided on the left side of the back surface of the leveling main body plate 26 (the surface opposite to the side facing the tilled body 3). Similarly, on the right side of the back surface of the leveling main body plate 26, a pair of left and right projecting plates 29 projecting from each other are provided.

  The lifting assist means 8 lifts the leveling body 4 by urging the leveling body 4 upward by using the urging force of the compression spring 31 that is, for example, a coiled urging body that can expand and contract, that is, the machine body. 2 assists the upward rotation of the leveling body 4 with respect to 2.

  The lifting assist means 8 includes an assist-on state (operation state) in which the compression spring 31 urges the leveling body 4 upward, and an assist-off state (non-operation state) in which the compression spring 31 does not urge the leveling body 4 upward. (Operation state) can be selectively switched. That is, for example, the lifting assist means 8 enters an assist-off state when the detachable pin 32 that is the detachable member is attached, and enters an assist-on state when the detachable pin 32 is removed.

  Here, the lifting assist means 8 has a longitudinally long longitudinal body (rod) 36 having a hole 35 to / from which the detachable pin 32 is attached / detached in the middle part in the longitudinal direction. The elongate body 36 is provided in the machine body 2 so as to be pivotable in the vertical direction about a horizontal axis 37. In other words, a mounting portion 33 protrudes from the left frame pipe portion 18 of the machine body 2, and the front end portion of the long body 36 is rotatably attached to the mounting portion 33 via the shaft 37.

  The elongate body 36 has an elongated cylindrical shape (including a substantially cylindrical shape) having a longitudinal direction in the front-rear direction. A shaft hole 38 is formed at the front end of the long body 36, and a shaft 37 is inserted into the shaft hole 38 and the hole of the mounting portion 33. The body 36 is rotatable with respect to the body 2. A pin hole 39 is formed at the rear end of the long body 36, and a spring receiving pin (R pin) 40, which is a spring receiving member, is detachably attached to the pin hole 39. . Further, a hole 35 as a hole for a pin is formed at the center in the front-rear direction, which is an intermediate part in the front-rear direction of the long body 36, and an attachment / detachment pin (R pin) 32 is attached to and removed from this hole 35 (insertion) To come out).

  Further, the lifting assist means 8 has a cylindrical rotating body (tumbler) 41 having an insertion hole 42. The rotating body 41 is rotatably provided on the upper portion of the protruding plate 28 of the leveling body 4.

  The rotating body 41 includes a cylindrical tubular portion 43 in which an insertion hole portion 42 is formed, and a left and right round shaft-shaped shaft portion 44 projecting outward on both sides of the tubular portion 43. Each shaft-like portion 44 is rotatably attached to the attachment hole 28a of the protruding plate 28.

  Further, the lifting assist means 8 is a cylindrical moving body (spring case) 46 that is inserted through the insertion hole 42 of the rotating body 41 and is movable (eg, slidable) with respect to the long body 36 and covers the compression spring 31. have. The moving body 46 is disposed on the outer peripheral side of the long body 36 so as to be slidable in the front-rear direction along the outer peripheral surface of the long body 36.

  The moving body 46 includes a main body cylinder portion 47 having a longitudinal shape that is shorter than the long body 36 and having a longitudinal shape and a cylindrical shape. On the inner peripheral side of the front end portion of the main body cylindrical portion 47, a circular annular spring receiving portion 48 is fixed. On the outer peripheral side in the vicinity of the rear end portion of the main body cylinder portion 47, a collar portion 49 that is a circular annular rotating body abutting portion that pushes up the rotating body 41 based on the biasing force of the compression spring 31 in the assist-on state is fixed. ing.

  A rotating body 41 is arranged on the outer peripheral side of the main body cylinder portion 47 of the movable body 46 so as to be slidable in the front-rear direction along the outer peripheral surface of the main body cylinder portion 47. That is, the rotating body 41 slides in the front-rear direction along the outer peripheral surface of the main body cylinder portion 47 of the moving body 46 according to the vertical rotation of the leveling body 4 in the assist-off state.

  Further, between the inner peripheral side of the main body cylindrical portion 47 of the moving body 46 and the outer peripheral side of the long body 36, elastically deformable elasticity for lifting assistance that biases the moving body 46 toward the front side. A compression spring 31 as a body is disposed in a compressed state. The compression spring 31 has a front end portion 31a in contact with the spring receiving portion 48 of the moving body 46 and a rear end portion 31b in contact with the spring receiving pin 40 (see FIG. 8).

  The ground pressure adjusting means 9 includes a plurality of holes 52 to which pins (not shown) of the spring end 51 are attached and detached, and one stopper pin hole (not shown) to which the stopper pins 54 of the stopper device 53 are attached and detached. A connecting rod 55 having

  The connecting rod 55 is provided in the machine body 2 so as to be pivotable in the vertical direction about a horizontal axis 56. In other words, the mounting portion 33 protrudes from the frame pipe portion 18 on the right side of the machine body 2, and the front end portion of the connecting rod 55 is rotatably attached to the mounting portion 33 via the shaft 56.

  Further, a first coil spring 58 and a second coil spring 59 for adjusting the ground pressure are provided on the outer peripheral side of the connecting rod 55, respectively. Further, the connecting rod 55 is inserted into a cylindrical rod insertion body (tumbler) 60 that is rotatably attached to the upper portion of the protruding plate 29 of the leveling body 4.

  As shown in FIG. 3, when the leveling body 4 is lifted up to the highest position (maintenance position) by rotating the leveling body 4 about the shaft 5 during maintenance, for example, the stopper pin 54 of the stopper device 53 is moved. It is automatically inserted into the stopper pin hole of the connecting rod 55, and as a result, the leveling body 4 is positioned and fixed at the highest position.

  In this way, the leveling body 4 is automatically locked at the highest position by the stopper device 53 which is a locking means. When the leveling body 4 is lowered, the lever of the stopper device 53 is operated to insert the stopper pin 54 from the stopper pin hole.

  Next, the operation and the like of the farm work machine 1 will be described.

  At the time of the farming work that is the farm work using the farm machine 1 connected to the tractor, the worker assists the lifting assist means 8 by attaching the detachable pin 32 to the hole 35 of the long body 36. Set it to the off state.

  Then, when the worker rides on the tractor and moves the agricultural machine 1 in the traveling direction by traveling of the tractor, the tiller 3 performs the tilling work, and the leveling body 4 performs the leveling work behind it.

  At this time, the front end portion of the moving body 46 abuts on the detachable pin 32 so that the forward movement of the moving body 46 with respect to the long body 36 is restricted by the detachable pin 32 (that is, the extension of the compression spring 31 is restricted). Therefore, the rotating body 41 slides in the front-rear direction relative to the moving body 46 according to the vertical rotation of the leveling body 4 (see FIG. 5).

  That is, when the rotating body 41 slides in the front-rear direction along the outer peripheral surface of the moving body 46, the leveling body 4 rotates up and down around the shaft 5 with respect to the machine body 2.

  On the other hand, for example, during maintenance such as replacement of the tilling claws 24 or cleaning of the leveling body 4, the operator removes the detachable pin 32 from the hole 35 of the long body 36, thereby turning the lifting assist means 8 into the assist-on state. Set to.

  Then, the forward movement of the moving body 46 with respect to the long body 36 is allowed (that is, the extension of the compression spring 31 is allowed), and the moving body 46 is moved to the long body 36 together with the rotating body 41 in contact with the flange portion 49. On the other hand, it moves forward based on the biasing force of the compression spring 31, and as a result, the leveling body 4 rotates upward based on the biasing force of the compression spring 31 (see FIG. 7).

  Then, when the operator lifts the leveling body 4 to the highest position by light human power, the leveling body 4 is automatically locked to the highest position by the stopper device 53 (see FIG. 3).

  In the example shown in the figure, since the leveling body 4 does not rotate upward to the highest position only by the urging force (elastic restoring force) of the compression spring 31, it is necessary for the operator to lift up to the highest position by human power. At this time, since the compression spring 31 does not have a free length (maximum length) and biases the leveling body 4 upward, the operator can raise the leveling body 4 to the highest position with light human power. It is possible to lift up to.

  And according to such a farming machine 1, when the lifting assist means 8 is switched to the assist-on state during maintenance or the like, the lifting assist means 8 in the assist-on state assists the lifting of the leveling body 4, The operator can easily lift the leveling body 4 to the highest position, and the burden on the operator can be reduced.

  Further, not only the configuration of the lifting assist means 8 is simple, but the lifting assist means 8 can be easily switched to the assist-off state only by attaching the detachable pin 32, and the lifting assist means 8 can be lifted only by removing the detachable pin 32. The assist means 8 can be easily switched to the assist-on state. That is, the on / off of the lifting assist means 8 can be easily switched only by inserting / removing the detachable pin 32 (one action).

  Further, when the lifting assist means 8 is in the assist-off state, the movement of the moving body 46 with respect to the long body 36 is restricted by the attaching / detaching pin 32, and the rotating body 41 is connected to the leveling body 4 with respect to the restricted moving body 46. Since it moves according to the movement, the lifting assist means 8 does not adversely affect the leveling work by the leveling body 4.

  Further, when the lifting assist means 8 is in the assist-on state, the moving body 46 is allowed to move with respect to the long body 36, and the moving body 46 together with the rotating body 41 is based on the biasing force of the compression spring 31. Therefore, it is possible to appropriately assist the lifting of the leveling body 4 using the biasing force of the compression spring 31.

  Further, the compression spring 31 as an urging body is accommodated in the cylindrical moving body 46 when the lifting assist means 8 is in the assist-off state, and the whole (substantially the entire) compression spring 31 is covered by the moving body 46. Therefore, mud or the like can be prevented from adhering to the compression spring 31 during work.

  Note that the lifting assist means 8 of the agricultural working machine 1 uses the biasing force of the gas spring 61, which is a stretchable biasing body, as in the second embodiment shown in FIGS. 13 to 23, for example. By lifting the body 4 upward, the lifting of the leveling body 4 may be assisted.

  The lifting assist means 8 includes an assist-on state (operation state) in which the gas spring 61 biases the leveling body 4 upward, and an assist-off state in which the gas spring 61 does not bias the leveling body 4 upward ( It is possible to selectively switch to the non-operating state. That is, for example, the lifting assist means 8 is in the assist-off state when the detachable pin 62 that is the detachable member is attached, and is in the assist-on state when the detachable pin 62 is removed.

  Further, the lifting assist means 8 has a longitudinally long body 66 having a hole 65 to / from which the detachable pin 62 is attached / detached in the middle in the longitudinal direction. Like the long body 36, the long body 66 is provided on the machine body 2 so as to be pivotable in the vertical direction about a left-right axis 37. In other words, a mounting portion 33 protrudes from the left frame pipe portion 18 of the machine body 2, and the front end portion of the long body 66 is rotatably attached to the mounting portion 33 via the shaft 37.

  The long body 66 fixes a pair of plate-like members 63 facing each other, a plurality of, for example, two color members 64 on the front and rear end sides, and the two plate-like members 63 via these color members 64. It is comprised with the volt | bolt 69 and the nut 70 which are fixing tools.

  A shaft hole 68 is formed at the front end of the long body 66, and a shaft 37 is inserted into the shaft hole 68 and the hole of the mounting portion 33. The body 66 is rotatable with respect to the body 2. In addition, a hole 65 which is a pin hole is formed in the center in the front-rear direction, which is an intermediate part in the front-rear direction of the long body 66, and the detachable pin 62 is attached to and detached from (inserted into and out from) the hole 65. It is like that.

  The lifting assist means 8 has a cylindrical rotating body (tumbler) 71 having an insertion hole 72. Similar to the rotating body 41, the rotating body 71 is rotatably provided on the upper portion of the protruding plate 28 of the leveling body 4. The rotating body 71 includes a rectangular cylindrical tubular portion 73 in which an insertion hole portion 72 is formed, and a left and right round shaft-like shape projecting outward on both sides of the tubular portion 73. Each of the shaft-like portions 74 is rotatably attached to the attachment hole portion 28a of the protruding plate 28.

  Further, the lifting assist means 8 includes a moving body 76 that is inserted into the insertion hole 72 of the rotating body 71 and is movable (eg, slidable) with respect to the long body 66. Similar to the moving body 46, the moving body 76 is arranged outside the long body 66 so as to be slidable in the front-rear direction along the outer surface of the long body 66.

  The moving body 76 has main body plate portions 77 that are shorter than the long body 66 and have a longitudinal shape in the front-rear direction that are spaced apart from each other. The front end portions of both body plate portions 77 are connected and fixed by a connecting plate portion 78 that is a pin contact portion that contacts the detachable pin 62, and a mounting hole 79 is formed in the central portion of the connecting plate portion 78. Yes. In addition, a protruding plate portion 80 that is a plate-like rotating body abutting portion that pushes up the rotating body 71 based on the biasing force of the gas spring 61 in the assist-on state protrudes from the rear end portions of both the body plate portions 77. ing.

  A rotating body 71 is slidably disposed along the outer surface of the main body plate portion 77 outside the main body plate portion 77 of the moving body 76. That is, the rotating body 71 slides in the front-rear direction along the outer surface of the main body plate portion 77 of the moving body 76 according to the vertical rotation of the leveling body 4 in the assist-off state.

  In this assist-off state, the gas spring 61 is accommodated in a cylindrical portion 81 composed of both main body plate portions 77 of the moving body 76 and both plate-like members 63 of the long body 66. The whole (substantially the whole) is covered with the cylindrical portion 81. That is, the gas spring 61 is covered by the long body 66 and the moving body 76 when the lifting assist means 8 is in the assist-off state (see FIGS. 13 and 14).

  Further, between the plate-like members 63 of the long body 66, a lifting assist gas spring 61 that urges the moving body 76 forward is disposed in a compressed state. The gas spring 61 includes a main body portion 82 in which a high-pressure gas such as nitrogen gas is sealed, and a rod portion 83 that enters and exits the main body portion 82. The base end portion of the main body portion 82 is attached to the collar member 64 on the rear end side of the long body 66, and the tip end portion of the rod portion 83 is attached to the attachment hole portion 79 of the connecting plate portion 78 of the moving body 76. It is attached via a pin 84. In addition, the other structure of the agricultural working machine 1 which concerns on this 2nd Embodiment is the same as the said 1st Embodiment.

  And at the time of the work which cultivates tillage using the agricultural working machine 1 which concerns on this 2nd Embodiment, an operator attaches the attachment / detachment pin 62 to the hole 65 of the elongate body 66, and a lifting assistance means 8 is set to the assist-off state.

  Thereafter, when the worker gets on the tractor and moves the agricultural machine 1 in the traveling direction by traveling of the tractor, the tiller 3 performs the tilling work, and the leveling body 4 performs the leveling work behind it.

  At this time, the front end portion of the connecting plate portion 78 of the moving body 76 abuts on the detachable pin 62 so that the forward movement of the moving body 76 relative to the long body 66 is restricted by the detachable pin 62 (that is, the extension of the gas spring 61 is suppressed) Therefore, the rotating body 71 slides in the front-rear direction relative to the moving body 76 according to the vertical rotation of the leveling body 4 (see FIG. 13). That is, the leveling body 4 is pivoted up and down about the shaft 5 with respect to the machine body 2 by the sliding movement of the pivoting body 71 in the front-rear direction along the outer peripheral surface of the rectangular tubular portion 81.

  On the other hand, for example, at the time of maintenance such as replacement of the tilling claws 24 or cleaning of the leveling body 4, the operator removes the detachable pin 62 from the hole 65 of the long body 66 to turn the lifting assist means 8 into the assist-on state. Set to.

  Then, the forward movement of the moving body 76 with respect to the long body 66 is allowed (that is, the extension of the gas spring 61 is allowed), and the moving body 76 together with the rotating body 71 in contact with the protruding plate portion 80 The ground leveling body 4 is moved upward based on the urging force of the gas spring 61 as a result of moving forward based on the urging force of the gas spring 61 (see FIG. 15).

  When the operator lifts the leveling body 4 to the highest position with a light human power, the leveling body 4 is automatically locked to the highest position by the stopper device 53. Also in this example, since the leveling body 4 does not rotate upward to the highest position only by the urging force of the gas spring 61, it is necessary for the operator to lift it up to the highest position by human power. The spring 61 does not have a free length (maximum length) and urges the leveling body 4 upward, so that the operator can lift the leveling body 4 to the highest position by light human power. Is possible.

  Thus, the farm work machine 1 according to the second embodiment can achieve the same operational effects as those of the first embodiment.

  Further, the lifting assist means 8 of the agricultural working machine 1 uses the urging force of the gas spring 91, which is an extendable urging body, as in the third embodiment shown in FIGS. 24 to 33, for example. By lifting the body 4 upward, the lifting of the leveling body 4 may be assisted.

  The lifting assist means 8 includes an assist-on state in which the gas spring 91 urges the ground leveling body 4 upward by the operation of the operation lever 90 as an operation member (for example, rotation for changing the position) and the gas spring. 91 can selectively switch to an assist-off state in which the leveling body 4 is not biased upward.

  That is, for example, the lifting assist means 8 is in the assist-off state (locked state) by turning the operation lever 90 in one direction (for example, turning downward), and the other direction that is opposite to the one direction of the operation lever 90. The assist-on state (unlocked state) is brought about by turning to (for example, turning upward).

  Here, the lifting assist means 8 has a longitudinally long body (inner pipe) 93 formed in a long and narrow cylindrical shape.

  The elongate body 93 is provided in the machine body 2 so as to be rotatable in the vertical direction around a horizontal axis 37. In other words, a mounting portion 33 protrudes from the frame pipe portion 18 on the left side of the machine body 2, and the front end portion of the long body 93 is rotatably attached to the mounting portion 33 via the shaft 37.

  The long body 93 is composed of, for example, a single round pipe. A shaft hole 94 is formed at the front end of the long body 93, and the shaft hole 94 and the hole of the mounting portion 33 are formed. A shaft 37 is inserted into the portion, and the elongated body 93 is rotatable in the vertical direction with respect to the machine body 2 around the inserted shaft 37. Further, a long slot-shaped guide slot 95 along the longitudinal direction of the elongated body 93 is formed in the middle part of the elongated body 93 in the front-rear direction. Further, a pin hole 96 is formed at the rear end of the long body 93.

  A gas spring 91 is accommodated in the long body 93. As a result, the gas spring 91 is always covered and protected by the long body 93 as a whole. The gas spring 91 includes a main body 98 in which a high-pressure gas such as nitrogen gas is sealed, and a rod 99 that enters and exits the main body 98.

  A pin hole 100 is formed at the base end portion of the main body 98 of the gas spring 91. The pin hole 100 and the mounting pin 101 inserted into the pin hole 96 of the elongated body 93 are removed. The main body 98 of the gas spring 91 is attached to the long body 93 by the stop pin 102.

  Further, the lifting assist means 8 has a short cylindrical (for example, octagonal cylindrical) rotating body (tumbler) 106 having an insertion hole 105. The rotating body 106 is rotatably provided at an upper protruding portion in the upper part of the protruding plate 28 of the leveling body 4.

  The rotating body 106 includes an octagonal cylindrical portion 107 in which an insertion hole portion 105 is formed, and a left and right round shaft-shaped shaft projecting outward on the left and right sides of the cylindrical portion 107. The shafts 108 are rotatably attached to the mounting holes 28a of the protruding plate 28. The rotating body 106 is rotatable with respect to the leveling body 4 around a shaft portion 108 in the left-right direction.

  Further, the lifting assist means 8 includes a moving body (outer pipe) 111 that is inserted into the insertion hole portion 105 of the rotating body 106 and is movable (eg, slidable) with respect to the elongated body 93. The movable body 111 is slidably movable in the front-rear direction (longitudinal direction of the long body) along the outer peripheral surface of the long body 93 on the outside (outer peripheral side) of the long body 93, that is, slidable. Has been.

  The movable body 111 has a cylindrical portion 112 that is long and cylindrical in the front-rear direction in which the rotating body 106 is slidably disposed on the outer peripheral side. A pin hole is formed at the front end of the tubular portion 112. 113 is formed. Then, the rod portion of the gas spring 91 is constituted by the pin hole portion 113, the pin hole portion 114 of the rod portion 99, and the mounting pin 115 and the retaining pin 116 inserted into the guide elongated hole portion 95 of the elongated body 93. 99 is attached to the moving body 111. Therefore, the moving body 111 slides along the outer peripheral surface of the long body 93 in accordance with the expansion and contraction of the gas spring 91 that biases the moving body 111 upward (see FIG. 31). At this time, the mounting pin 115 is guided in the guide long hole portion 95 of the elongated body 93.

  Further, on the outer peripheral surface of the intermediate portion in the front-rear direction of the cylindrical portion 112 is a circular annular rotating body abutting portion that pushes up the rotating body 106 based on the urging force of the gas spring 91 when the lifting assist means 8 is in the assist-on state. A certain flange 118 is fixed in a protruding shape. Further, a restricting plate mounting portion 120 and a lever mounting portion 121 are fixedly provided on the rear end side of the cylindrical portion 112. The restricting plate mounting portion 120 is configured by a substantially L-shaped plate 123 having a screw hole 122 formed therein. The lever mounting portion 121 is configured by a pair of opposing plates 124 that are opposed to each other.

  A lever restricting plate 125, which is a restricting portion for restricting the operation lever 90 from rotating more than necessary by contact with the operation lever 90, is attached to the restricting plate attaching portion 120 of the moving body 111 with an attachment screw 126. It has been. An attachment hole 127 and a restriction long hole 128 are formed in the lever restriction plate 125.

  In addition, a substantially L-shaped operation lever 90 that is manually held and operated by an operator is attached to the lever mounting portion 121 of the movable body 111 so as to be rotatable to an off position (down position) and an on position (up position). It has been.

  That is, the operating lever 90 is inserted into the mounting hole 124a of the opposing plate 124 of the lever mounting portion 121, the retaining ring 130 is attached to the inserted operating lever 90, and the operating lever 90 is the lever regulating plate. It is inserted through 125 restriction long hole portions 128. Thus, the operation lever 90 can be rotated between the off position and the on position about the center line X in the front-rear direction (including the substantially front-rear direction) with respect to the moving body 111 (see FIG. 30).

  The operation lever 90 has a lever main body 131 made of a round bar bent in an L shape, and a screw hole 132 is formed in an intermediate portion of the lever main body 131. A pin 133 that is a male screw is screwed into the screw hole 132, and a cylindrical resin collar 134 is attached to the pin.

  On the other hand, a leaf spring 136, which is an elastically deformable plate-like elastic member for positioning the operation lever 90 at either the off position or the on position, can be attached to and detached from the lever regulating plate 125 by the attaching means 137. It is attached. The attachment means 137 is constituted by, for example, a bolt 138, a nut 139, and a spacer 140, and a gap portion 135 exists between the lever regulating plate 125 and the leaf spring 136.

  The plate spring 136 has, for example, a rectangular flat plate shape before being elastically deformed, and an attachment hole portion 136a into which the bolt 138 is inserted is formed on one end side of the plate spring 136. Further, a contact portion 134a that is a part of the outer peripheral surface of the collar 134 of the operation lever 90 is in contact with a surface of the leaf spring 136 that is located on the side opposite to the lever regulating plate 125 side.

  For this reason, when the operation lever 90 is rotated, the collar 134 moves along a virtual arc centered on the center line X. At this time, the contact portion 134a of the collar 134 presses the leaf spring 136 to bend elastically. It is smoothly slid along the leaf spring 136 while being deformed.

  When the operation lever 90 is located at the off position or the on position, the leaf spring 136 returns to the original flat plate shape by the elastic restoring force, and the restored leaf spring 136 causes the operation lever 90 to move to its desired position (off position and on position). Positioning is held at any position).

  As is clear from FIG. 30, when the operation lever 90 is in the off position, the contact portion 90a, which is a part of the operation lever 90, faces the rear end surface 93a of the elongated body 93 and this rear end surface As a result, the movement of the moving body 111 with respect to the long body 93 is restricted. However, when the operating lever 90 is turned upward from the off position to the on position, the contact portion 90a of the operating lever 90 is separated from the rear end surface 93a of the long body 93, and the moving body 111 is moved by the operating lever 90. Regulations are lifted.

  The other configuration of the agricultural machine 1 according to the third embodiment shown in FIGS. 24 to 33 is the same as that of the first embodiment.

  And at the time of the work which cultivates tilling work using the agricultural working machine 1 which concerns on this 3rd Embodiment, an operator operates the operation lever 90 and positions it in an OFF position, The lift assist means 8 is made. Set the assist off state.

  Thereafter, when the worker gets on the tractor and moves the agricultural machine 1 in the traveling direction by traveling of the tractor, the tiller 3 performs the tilling work, and the leveling body 4 performs the leveling work behind it.

  At this time, the contact portion 90a of the operating lever 90 contacts the rear end surface 93a of the long body 93, so that the forward movement of the moving body 111 with respect to the long body 93 is restricted by this operating lever 90 (that is, the gas spring 91 Since the elongation is regulated, the rotating body 106 slides in the front-rear direction relative to the moving body 111 in accordance with the vertical rotation of the leveling body 4 (see FIG. 25). That is, when the rotating body 106 slides in the front-rear direction along the outer peripheral surface of the cylindrical portion 112 of the moving body 111, the leveling body 4 rotates up and down around the axis 5 with respect to the machine body 2.

  On the other hand, at the time of maintenance such as replacement of the tilling claws 24 and cleaning of the leveling body 4, the operator operates the operation lever 90 to be positioned at the on position, thereby bringing the contact portion 90 a into the rear of the long body 93. The lift assist means 8 is set to the assist-on state apart from the end face 93a.

  Then, the forward movement of the moving body 111 with respect to the long body 93 is allowed (that is, the extension of the gas spring 91 is allowed), and the moving body 111 is moved to the long body 93 together with the rotating body 106 that is in contact with the flange 118. On the other hand, it moves forward based on the urging force of the gas spring 91, and as a result, the leveling body 4 rotates upward based on the urging force of the gas spring 91 (see FIG. 27).

  When the operator lifts the leveling body 4 to the highest position with a light human power, the leveling body 4 is automatically locked to the highest position by the stopper device 53. Also in this example, since the leveling body 4 does not rotate upward to the highest position only by the urging force of the gas spring 91, it is necessary for the operator to lift up to the highest position by human power. The spring 91 does not have a free length (maximum length) and urges the leveling body 4 upward, so that the operator can lift the leveling body 4 to the highest position with light human power. Is possible.

  Thus, the farm work machine 1 according to the third embodiment can achieve the same effects as the first and second embodiments.

  That is, for example, when the lifting assist means 8 is switched to the assist-on state by operating the operation lever 90 during maintenance or the like, the lifting assist means 8 in the assist-on state assists the lifting of the leveling body 4. The leveling body 4 can be easily lifted to the highest position, and the burden on the operator can be reduced.

  Further, the lifting assist means 8 can be easily switched on / off only by a one-action operation of the operation lever 90, that is, for example, only by turning.

  Further, when the lifting assist means 8 is in the assist-off state with the operation lever 90 positioned at the off position, the movement of the moving body 111 with respect to the long body 93 is restricted by the operation lever 90, and the moving body 111 in which this movement is restricted. On the other hand, since the rotating body 106 moves according to the movement of the leveling body 4, the lifting assist means 8 does not adversely affect the leveling work by the leveling body 4.

  Further, when the lifting assist means 8 is in the assist-on state where the operation lever 90 is in the on position, the movable body 111 is allowed to move relative to the long body 93, and the movable body 111 that is allowed to move is the long body 93. On the other hand, since it moves together with the rotating body 106 based on the urging force of the gas spring 91, it is possible to appropriately assist the lifting of the leveling body 4 using the urging force of the gas spring 91.

  Further, the gas spring 91, which is an urging body, is accommodated in the long body 93 and is entirely covered with the long body 93, so that mud or the like adheres to the gas spring 91 during work. Can be prevented, and can be prevented from being damaged by foreign matter or the like.

  Further, since the lifting assist means 8 has a leaf spring 136 for positioning the operation lever 90, the operation lever 90 can be appropriately positioned and held at either the off position or the on position. Rotation can be prevented.

  The operation lever (operation member) 90 is not limited to the one provided so as to be rotatable on the movable body 111 so that the abutting portion 90a is in contact with or separated from the rear end surface 93a of the long body 93. For example, a thing movable with respect to a mobile body, a thing removable with respect to a mobile body, etc. may be sufficient.

  In any of the above-described embodiments, the configuration in which one lifting assist unit 8 and one ground pressure adjusting unit 9 are provided has been described. However, the configuration is not limited to this configuration, and the number thereof is arbitrary.

  For example, as shown in FIG. 34, a configuration in which two (plural) lifting assist means 8 and ground pressure adjusting means 9 are provided may be employed. Further, for example, a configuration including one lifting assist means 8 and two left and right contact pressure adjusting means 9 may be used.

  Moreover, the position which arrange | positions the lifting assistance means 8 is also arbitrary, For example, the structure etc. which arrange | positioned the lifting assistance means 8 in the position of the center side of the horizontal direction of the agricultural machine 1 may be sufficient.

  Further, for example, the leveling body 4 may be rotated upward to the highest position only by the urging force of the urging body (compression spring 31, gas springs 61, 91, etc.) of the lifting assist means 8.

  Further, the farm work machine 1 is not limited to one, and may be, for example, a three-folded foldable farm work machine. For example, from the first leveling board (level plate) and the second leveling board (rake) A halo or the like including a leveling body may be used.

  Although several embodiments of the present invention and modifications thereof have been described, the above-described embodiments and modifications can be appropriately combined without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Farming machine 3 Tillage body 4 Leveling body 8 Lifting assistance means
31 Compression spring as a biasing body
32, 62 Removable pin as a removable member
35, 65 hole
36, 66, 93 Long body
41, 71, 106 Rotating body
42, 72, 105 Insertion hole
46, 76, 111 mobile
61, 91 Gas spring as a biasing body
90 Operation lever as an operation member
136 Leaf spring, an elastic member

Claims (7)

A fuselage connected to the traveling vehicle;
A plowing body that is provided on this machine and performs plowing work;
A leveling body that performs leveling work behind this tillage body,
A lifting assist means for assisting lifting of the leveling body using a biasing force for lifting assist, and using the biasing force of the biasing body;
One of the lifting assist means is attached to the machine body side, and the other side is attached to the leveling body side. Agricultural working machine. The agricultural work machine according to claim 1, wherein the lifting assist means includes a long body and a movable body movable relative to the long body. The lifting assist means has a rotating body rotatably provided on the leveling body,
The agricultural working machine according to claim 2, wherein the moving body moves with respect to the long body based on the urging force of the urging body together with the rotating body. The farm work machine according to any one of claims 1 to 3, wherein the lifting assist means is switchable between an assist-off state and an assist-on state by operating the operation member. The agricultural working machine according to any one of claims 1 to 4, wherein at least a part of the urging body is stored in the lifting assist means. The agricultural working machine according to any one of claims 1 to 5, wherein the biasing body is a gas spring. The agricultural working machine according to any one of claims 1 to 6, wherein one side of the lifting assist means is attached to an attachment portion provided on a frame of the machine body.

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