JP2019088340A - Farm working machine - Google Patents

Abstract

To provide a farm working machine that can alleviate a burden on a worker.SOLUTION: A farm working machine 1 comprises a tilling body for performing tilling work, and a soil preparation body 4 for performing soil preparation work at the rear of the tilling body. The farm working machine 1 comprises lifting assist means 8 for assisting lifting of the soil preparation body 4. The lifting assist means 8 can be selectively switched between an assist-on state and an assist-off state. The lifting assist means 8 comprises a biasing body for assisting the lifting, and at least a portion of the biasing body is located in the lifting assist means 8.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a farm work machine capable of reducing the burden on workers.

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

  This conventional agricultural work machine is provided with an airframe connected to a traveling vehicle such as a tractor, a tillage body rotatably provided on the airframe and performing a tilling operation while being rotated, and an airframe rotatably provided on the airframe. It comprises a leveling body for leveling work behind the body, and a stopper device for locking the leveling body in the highest position.

JP, 2005-218316, A

  However, in the above-described conventional agricultural work machine, when performing maintenance such as changing the claws of a tillage body or cleaning of the leveling body, for example, the worker needs to lift a relatively heavy leveling body, and takes time to lift this leveling body. There is a fear.

  This invention is made in view of such a point, and an object of this invention is to provide the farm work machine which can reduce a worker's burden.

  The agricultural work machine according to claim 1 comprises a tillage body for performing a tilling operation, a leveling body for performing leveling work behind the tillage body, and a lifting assist means for assisting lifting of the leveling body, the lifting assist The means is a farm work machine capable of being selectively switched between the assist off state and the assist on state, wherein the lifting assist means has a biasing body for lifting assist, and the biasing body of the biasing body At least a portion is accommodated in the lifting assist means.

  A farm work machine according to claim 2 is the farm work machine according to claim 1, wherein the lifting assist means has a tubular member, and at least a part of the biasing body is housed in the tubular member. It is

  A farm work machine according to a third aspect of the present invention is the farm work machine according to the second aspect, wherein the tubular member covers the entire biasing body at least in the assist-off state.

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

  A farm work machine according to claim 5 is the farm work machine according to any one of claims 1 to 4, wherein the lifting assist means is brought into the assist off state by rotation of the operation member in one direction. By turning in the direction, the assist on state is obtained.

  According to the present invention, the lifting assist means in the assist on state assists the lifting of the ground leveling body, so that the burden on the operator can be reduced.

It is a top view of a farm work machine concerning a 1st embodiment of the present invention. It is a perspective view of a farming machine same as the above. It is a perspective view at the time of the leveling body lifting up (at the time of maintenance) of the agricultural working machine same as the above. It is a side view at the time of assist off of an agricultural work machine same as the above. It is a side view at the time of assist off of an agricultural work machine same as the above. It is a side view at the time of the assist on of an agricultural work machine same as the above. It is a side view at the time of the assist on of an agricultural work machine same as the above. It is a front view of the lifting assistance means (assist-off state) of the agricultural working machine same as the above. It is a side view of the elongate body of the same upper lifting assistance means. It is a front view of the energizing body of the same lifting support means. It is a front view of the movable body of the same lifting assistance means. It is a side view of the rotation body of the same upper lifting assist means. 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. FIG. 6 is a side view of the same lifting assistance means (assist-off state). It is a front view of the same lifting assistance means (assist on state). It is a front view of the elongate body of the same upper lifting assistance means. It is a side view of the elongate body of the same upper lifting assistance means. It is a front view of the movable body of the same lifting assistance means. FIG. 7 is a side view of the movable body of the lifting assistance means of the same. It is a bottom view of the movable body of a lifting assistance means same as the above. It is a front view of the rotation body of the same upper lifting assist means. It is a side view of the rotation body of the same upper lifting assist means. It is a bottom view of the rotation body of the same upper lifting assist means. It is a side view at the time of assist off of the agricultural-work machine which concerns on the 3rd Embodiment of this invention. It is a side view at the time of assist off of an agricultural work machine same as the above. It is a side view at the time of the assist on of an agricultural work machine same as the above. It is a side view at the time of the assist on of an agricultural work machine same as the above. It is a front view of the lifting assistance means (assist-off state) of the agricultural working machine same as the above. (A) is a view on arrow a in FIG. 28; (b) is a partially enlarged portion thereof. FIG. 30 is a view on arrow b of FIG. 29. FIG. 7 is an operation diagram of the same lifting support means. Fig. 6 is an exploded front view of the lifting assistance means of the same. It is a disassembled side view of the same lifting assistance means. It is a top view of a farm work machine concerning a 4th embodiment of the present invention.

  A first embodiment of the present invention will be described with reference to FIGS. 1 to 12.

  Reference numeral 1 in the figure is a farm work machine, and this farm work machine 1 is connected to the rear of a tractor (not shown) which is, for example, a traveling vehicle, and moves along the field on the field (traveling direction) by traveling the tractor. Land preparation work (farm work) is done.

  The agricultural work machine 1 is an airframe 2 detachably connected to a three-point link portion (agricultural work machine lifting and lowering portion) at the rear of a tractor, and a tillage which is rotatably provided on the airframe 2 and rotates in a predetermined direction. A plate-like leveling body (flat plate) which is provided rotatably on the body (rotary) 3 and the machine body 2 in the vertical direction centering on a horizontal axis 5 (rotational fulcrum) It is equipped with four.

  In addition, the agricultural working machine 1 is provided with lifting assisting means 8 for assisting lifting (upward rotation) of the leveling body 4 by the manual operation of the worker at the time of 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 airframe 2 and the ground adjusting body 4 at a position on the left side which is one side of the agricultural working machine 1.

  Furthermore, the agricultural working machine 1 is provided with the contact pressure adjustment means 9 which adjusts the contact pressure with respect to the heel scene of the ground adjustment body 4 so that it may respond to a field condition. The contact pressure adjusting means 9 is, for example, one, and is provided between the airframe 2 and the ground adjusting body 4 at a position on the right side which is the other side of the agricultural working machine 1.

  The airframe 2 has a three-point connecting portion (traveling vehicle connecting portion) 11 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 on the left and right, and a lower pin 15 attached to each lower arm 14 It is composed of

  Further, the machine body 2 has a transmission case portion 17 which is a shaft holding portion for holding the input shaft 16 rotatably, and the inner end portion of the frame pipe portion 18 is attached to the left and right sides of the transmission case portion 17 There is. The input shaft 16 is connected to the PTO shaft of the tractor via a joint (not shown).

  At the outer end of the left side frame pipe portion 18, a chain case portion 19 which is a box-like cultivation body support portion is attached. At the outer end of the right frame pipe portion 18, a bracket portion 20, which is a plate-like support for a tiller, is attached. The tilling body 3 is rotatably supported by the chain case portion 19 and the bracket portion 20 which are separated from each other. A side cover plate 10 is provided on the chain case portion 19 and the bracket portion 20 so as to project rearward.

  Furthermore, the airframe 2 has an upwardly convex curved plate-like tilling cover portion 21 covering the upper portion of the tillage body 3. The ground aligning body 4 is attached to the rear end portion of the tillage cover portion 21 via the plurality of, for example, three hinges 22 so as to be vertically rotatable about an axis 5 in the left-right direction. A gauge wheel 30 is provided on the front side of the fuselage 2 for vertical position adjustment.

  The tilling body 3 has a left and right direction cultivating shaft 23 rotatably mounted between the lower portion of the chain case portion 19 and the lower portion of the bracket portion 20. That is, the left end portion which is one axial end portion of the tillage shaft 23 is rotatably supported at the lower portion of the chain case portion 19 and the right end portion which is the other axial end portion of the tillage shaft 23 is the lower portion of the bracket portion 20 Is rotatably supported.

  And the tillage shaft 23 receives power from a power transmission means (not shown) for transmitting power from the input shaft 16 side to the tillage body 3 and rotates in a predetermined direction. The power transmission means is composed of a gear in the transmission case 17, a shaft in the frame pipe 18, a chain in the chain case 19, and the like.

  Further, at a plurality of locations spaced in the axial direction of the tillage shaft 23, tillers 24 that perform tillage work while being integrated with the tillage shaft 23 and rotating in a predetermined direction are detachably attached. A blade portion 25 is formed on the front side in the rotational direction of each of the tilling claws 24.

  The ground aligning body 4 is attached to a rear end portion of the tillage cover portion 21 so as to be vertically pivotable so that the rear end side moves 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 end portions in the left-right direction of the leveling main body plate 26.

  Further, on the left side of the rear surface (surface opposite to the side facing the cultivating body 3) of the ground aligning main body plate 26, a pair of left and right projecting plates 28 which are spaced apart and opposed to each other are protruded. Similarly, on the right side of the rear surface of the leveling main body plate 26, a pair of left and right projecting plates 29 which are spaced apart and opposed to each other are protruded.

  The lifting assist means 8 lifts the leveling body 4 by urging the leveling body 4 upward using the biasing force of the compression spring 31 which is, for example, an expandable coil-like biasing body, that is, the airframe It assists the upward rotation of the ground aligning body 4 with respect to 2.

  The lifting assist means 8 is in an assist-on state (working state) in which the compression spring 31 biases the ground support 4 upward, and in an assist-off state (non-operational) in which the compression spring 31 does not bias the ground support 4 upward. It can be selectively switched to the operation state). That is, for example, the lifting assist means 8 is in the assist off state by the attachment of the attachment / detachment pin 32 which is the attachment / detachment member, and is in the assist on state by the removal of the attachment / detachment pin 32.

  Here, the lifting assist means 8 has an elongated body (rod) 36 in the front-rear direction having a hole 35 at the middle in the longitudinal direction in which the mounting pin 32 is attached and detached. The long body 36 is provided on the machine body 2 so as to be vertically rotatable about an axis 37 in the left-right direction. That is, a mounting portion 33 is provided so as to protrude from the frame pipe portion 18 on the left side of the machine body 2, and a front end portion of the elongated body 36 is rotatably mounted to the mounting portion 33 via a shaft 37.

  The elongated body 36 is an elongated cylindrical (including a substantially cylindrical) having a longitudinal direction in the front-rear direction. A shaft hole 38 is formed at the front end of the elongated body 36, and the shaft 37 is inserted into the shaft hole 38 and the hole portion of the mounting portion 33, and the shaft 37 is long around the inserted shaft 37. The body 36 is rotatable relative to the machine 2. Further, a pin hole 39 is formed at the rear end of the elongated 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 which is a hole for pin is formed at a central portion in the front-rear direction which is a middle portion in the front-rear direction of the elongated body 36, and the mounting pin (R pin) 32 is attached to Go 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 at the upper part of the projecting plate 28 of the ground adjusting body 4.

  The pivoting body 41 has a cylindrical tubular portion 43 in which the insertion hole 42 is formed, and a left and right round shaft shaped shaft portion 44 projecting outward on both sides of the tubular portion 43. The respective shaft-like portions 44 are rotatably attached to the attachment holes 28 a of the projecting plate 28.

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

  The movable body 46 has a cylindrical main body cylindrical portion 47 which is longitudinal in the front-rear direction and has a length shorter than that of the elongated body 36. A circular annular spring receiving portion 48 is fixedly provided on the inner peripheral side of the front end portion of the main body cylindrical portion 47. On an outer peripheral side near the rear end portion of the main body cylindrical portion 47, a collar portion 49 which is a circular ring-shaped rotating body contact portion that pushes up the rotating body 41 based on the biasing force of the compression spring 31 in the assist on state is fixedly provided. ing.

  Then, on the outer peripheral side of the main body cylindrical portion 47 of the movable body 46, the rotating body 41 is disposed slidably along the outer peripheral surface of the main body cylindrical portion 47 in the front-rear direction. That is, the pivoting body 41 slides in the front-rear direction along the outer peripheral surface of the main body cylindrical portion 47 of the movable body 46 according to the vertical pivoting of the ground adjusting body 4 in the assist-off state.

  In addition, between the inner peripheral side of the main body cylindrical portion 47 of the movable body 46 and the outer peripheral side of the elongated body 36, an elastically deformable elastic for elastic lifting for urging the movable body 46 forward. The compression spring 31, which is a body, is disposed in a compressed state. The compression spring 31 has a front end 31a in contact with the spring receiving portion 48 of the movable body 46 and a rear end 31b in contact with the spring receiving pin 40 (see FIG. 8).

  The contact pressure adjusting means 9 has a plurality of holes 52 to which the pins (not shown) of the spring end 51 are attached and detached and a single stopper pin hole (not shown) to which the stopper pins 54 of the stopper device 53 are attached and detached. And a connecting rod 55.

  The connecting rod 55 is provided on the machine body 2 so as to be vertically rotatable about a shaft 56 in the left-right direction. That is, the mounting portion 33 is provided to project 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 mounted on the mounting portion 33 via the shaft 56.

  Further, on the outer peripheral side of the connecting rod 55, a first coil spring 58 and a second coil spring 59 for adjusting the ground contact pressure are respectively disposed. Further, the connecting rod 55 is inserted through a cylindrical rod inserted body (tumbler) 60 rotatably mounted on the upper portion of the projecting plate 29 of the ground adjusting body 4.

  Then, as shown in FIG. 3, for example, at the time of maintenance or the like, when the ground adjustment body 4 is lifted up to the highest position (maintenance position) by rotating it upward about the shaft 5, the stopper pin 54 of the stopper device 53 It is automatically inserted into the stopper pin hole of the connecting rod 55, and as a result, the ground adjusting body 4 is positioned and fixed at the highest position.

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

  Next, the operation and the like of the agricultural working machine 1 will be described.

  At the time of work to carry out tillage work as farming work by using the agricultural working 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 elongated body 36 Set to off state.

  Then, when the worker gets on the tractor and moves the agricultural working machine 1 in the traveling direction by traveling the tractor, the tillage body 3 performs the tillage work, and the ground leveling body 4 performs the ground leveling work behind it.

  At this time, the forward movement of the movable body 46 with respect to the long body 36 is restricted (that is, the extension of the compression spring 31 is restricted) by the detachable pin 32 by the front end portion of the movable body 46 abutting on the detachable pin 32. Therefore, the pivoting body 41 slides in the front-rear direction with respect to the movable body 46 in response to the vertical pivoting of the ground aligning 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 ground adjusting body 4 rotates in the vertical direction around the shaft 5 with respect to the body 2.

  On the other hand, at the time of maintenance such as replacement of the cultivating claw 24 or cleaning of the leveling body 4, the operator removes the detachable pin 32 from the hole 35 of the elongated body 36 to assist the lifting assist means 8 in the on state. Set to

  Then, forward movement of the movable body 46 with respect to the elongated body 36 is permitted (that is, extension of the compression spring 31 is allowed), and the elongated body 36 is moved together with the rotating body 41 in contact with the collar 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 worker lifts up the ground leveling body 4 to the maximum lifting position with light human force, the leveling body 4 is automatically locked in the maximum lifting position by the stopper device 53 (see FIG. 3).

  In this illustrated example, since the ground adjustment body 4 does not rotate upward to the highest position only by the biasing force (elastic restoring force) of the compression spring 31, it is necessary for the operator to slightly lift it to the highest position. At this time, since the compression spring 31 does not have a free length (maximum length) and biases the leveling body 4 upward, the worker lifts up the leveling body 4 by the light human power. It is possible to lift up.

  Then, according to such an agricultural work machine 1, when the lifting assist means 8 is switched to the assist on state at the time of maintenance or the like, the lifting assist means 8 in the assist on state assists the lifting of the ground body 4. The operator can easily lift the ground leveler 4 to the highest position, and the burden on the operator can be reduced.

  Moreover, the structure of the lifting assist means 8 is not only simple, but the lifting assist means 8 can be easily switched to the assist off state only by the attachment of the detachable pin 32, and the lifting by the detachment of the detachable pin 32 alone. 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 the insertion and removal (one action) of the attachment and detachment pin 32.

  Furthermore, when the lifting assist means 8 is in the assist-off state, the movement of the movable body 46 with respect to the long body 36 is restricted by the attaching / detaching pin 32, and the rotary body 41 In order to move in accordance with the movement, the lifting assist means 8 does not adversely affect the leveling operation by the leveling body 4.

  Further, when the lifting assist means 8 is in the assist on state, the movement of the movable body 46 with respect to the long body 36 is permitted, and the movable body 46 with the rotary body 41 with respect to the long body 36 is based on the biasing force of the compression spring 31. Can move appropriately, the lifting force of the leveling body 4 can be appropriately assisted using the biasing force of the compression spring 31.

  Furthermore, the compression spring 31, which is an urging body, is accommodated in the cylindrical movable body 46 when the lifting assist means 8 is in the assist-off state, and the entire (substantially the entire) compression spring 31 is covered by the movable body 46. Therefore, mud and the like can be prevented from adhering to the compression spring 31 at the time of operation.

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

  The lifting assist means 8 is an assist on state (working state) in which the gas spring 61 biases the ground leveling body 4 upward and an assist off state in which the gas spring 61 does not bias the ground leveling body 4 upward ( It can be selectively switched to the non-operating state). That is, for example, the lifting assist means 8 is in the assist off state by the attachment of the attachment / detachment pin 62 which is the attachment / detachment member, and is in the assist on state by the removal of the attachment / detachment pin 62.

  Further, the lifting assist means 8 has an elongated body 66 in the front-rear direction having a hole 65 at the middle in the longitudinal direction in which the mounting and demounting pin 62 is attached and detached. As in the case of the elongated body 36, the elongated body 66 is provided on the machine body 2 so as to be vertically pivotable about an axis 37 in the left-right direction. That is, a mounting portion 33 is provided so as to protrude from the frame pipe portion 18 on the left side of the machine body 2, and a front end portion of the elongated body 66 is rotatably mounted to the mounting portion 33 via a shaft 37.

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

  A shaft hole 68 is formed at the front end of the elongated body 66, and the shaft 37 is inserted into the shaft hole 68 and the hole portion of the mounting portion 33. The shaft 37 is long around the inserted shaft 37. The body 66 is rotatable with respect to the airframe 2. Further, a hole 65 which is a pin hole is formed at a central portion in the front-rear direction which is a middle portion in the front-rear direction of the elongated member 66, and the detachable pin 62 is attached to or detached from (inserted out) It is supposed to be.

  Further, the lifting assist means 8 has a cylindrical rotating body (tumbler) 71 having an insertion hole portion 72. Like the rotating body 41, the rotating body 71 is rotatably provided on the upper portion of the projecting plate 28 of the ground adjusting body 4. The rotary body 71 has a rectangular cylindrical tubular portion 73 in which the insertion hole portion 72 is formed, and a left and right circular shaft shaped projecting outward on both sides of the cylindrical portion 73. The shaft-shaped portions 74 are rotatably attached to the mounting holes 28 a of the projecting plate 28.

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

  The movable body 76 has a main body plate portion 77 which is opposed to each other in a front-rear direction longitudinal shape whose length is shorter than that of the elongated body 66. The front end portions of both main body plate portions 77 are connected and fixed by a connecting plate portion 78 which is a pin abutting portion that abuts on the detachable pin 62, and a mounting hole 79 is formed in the central portion of the connecting plate portion 78 There is. Further, at the rear end of both main body plate portions 77, a projecting plate portion 80 which is a plate-like pivoting body abutting portion which pushes up the pivoting body 71 based on the biasing force of the gas spring 61 in the assist on state is provided. ing.

  Then, on the outer side of the main body plate portion 77 of the movable body 76, the rotating body 71 is disposed slidably along the outer surface of the main body plate portion 77. That is, the pivoting body 71 slides in the front-rear direction along the outer surface of the main body plate portion 77 of the movable body 76 according to the vertical pivoting of the leveling body 4 in the assist-off state.

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

  In addition, a gas spring 61 for lifting assistance, which urges the moving body 76 forward, is disposed between the plate-like members 63 of the elongated body 66 in a compressed state. The gas spring 61 is composed of a main body 82 in which high pressure gas such as nitrogen gas is sealed, and a rod 83 that enters and exits the main body 82. The base end of the main body 82 is attached to the collar member 64 on the rear end side of the elongated body 66, and the tip of the rod 83 is attached to the attachment hole 79 of the connecting plate 78 of the movable body 76. It is attached via pin 84. The other configuration of the agricultural working machine 1 according to the second embodiment is the same as that of the first embodiment.

  And at the time of work which carries out a tillage work using the agricultural working machine 1 according to the second embodiment, the worker attaches the detachable pin 62 to the hole portion 65 of the elongated body 66, thereby providing a lifting assist means. Set 8 to the assist off state.

  After that, when the worker gets on the tractor and moves the agricultural working machine 1 in the traveling direction by traveling the tractor, the tillage body 3 performs the tillage work, and the ground leveling body 4 performs the ground leveling work behind it.

  At this time, the front end portion of the connection plate portion 78 of the movable body 76 abuts on the detachable pin 62, whereby the forward movement of the movable body 76 with respect to the long body 66 is restricted by the detachable pin 62 (that is, the extension of the gas spring 61 is Since it is regulated, the pivoting body 71 slides in the front-rear direction with respect to the movable body 76 in accordance with the vertical rotation of the ground aligning body 4 (see FIG. 13). That is, when the rotating body 71 slides in the front-rear direction along the outer peripheral surface of the rectangular tubular portion 81, the ground adjusting body 4 rotates in the vertical direction with respect to the body 2 about the shaft 5.

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

  Then, forward movement of the movable body 76 with respect to the elongated body 66 is permitted (that is, extension of the gas spring 61 is allowed), and the elongated body 66 is moved together with the rotating body 71 in which the movable body 76 is in contact with the projecting plate portion 80. On the other hand, it moves forward based on the biasing force of the gas spring 61, and as a result, the leveling body 4 rotates upward based on the biasing force of the gas spring 61 (see FIG. 15).

  Then, when the worker lifts up the leveling body 4 to the maximum lifting position with light manual force, the leveling body 4 is automatically locked in the maximum lifting position by the stopper device 53. Also in this example, the leveling body 4 does not turn upward to the highest position only by the biasing force of the gas spring 61, so it is necessary for the operator to slightly lift it to the highest position manually. Since the spring 61 does not have a free length (maximum length) and biases the leveling body 4 upward, the worker may lift the leveling body 4 to the highest position by light human power. It is possible.

  As described above, also with the agricultural work machine 1 according to the second embodiment, the same operation and effect as those of the first embodiment can be achieved.

  Further, the lifting assist means 8 of the agricultural working machine 1 is, for example, as in the third embodiment shown in FIG. 24 to FIG. 33, ground adjustment using the biasing force of the gas spring 91 which is a telescopic biasing member. The body 4 may be urged upward to assist lifting of the leveling body 4.

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

  That is, for example, the lifting assist means 8 is brought into the assist off state (locked state) by pivoting (for example, downward pivoting) of the operating lever 90 in one direction, and another direction opposite to the one direction of the operating lever 90 The assist on state (lock release state) is established by turning (for example, upward turning).

  Here, the lifting assist means 8 has a longitudinal body (inner pipe) 93 formed in an elongated cylindrical shape in the front-rear direction.

  The elongated body 93 is provided on the machine body 2 so as to be vertically rotatable about a shaft 37 in the left-right direction. That is, a mounting portion 33 is provided so as to protrude from the frame pipe portion 18 on the left side of the machine body 2, and a front end portion of the elongated body 93 is rotatably mounted to the mounting portion 33 via a shaft 37.

  The elongated body 93 is, for example, formed of only one round pipe, and a shaft hole 94 is formed at the front end of the elongated body 93. The shaft hole 94 and the hole of the mounting portion 33 are formed. The shaft 37 is inserted into the portion, and the elongated body 93 is vertically rotatable with respect to the machine body 2 about the inserted shaft 37. Further, at the middle portion in the front-rear direction of the elongated body 93, an elongated hole-shaped guiding elongated hole portion 95 along the longitudinal direction of the elongated body 93 is formed. Furthermore, a pin hole 96 is formed at the rear end of the elongated body 93.

  The gas spring 91 is accommodated and disposed in the elongated body 93. As a result, the gas spring 91 is always covered and protected by the elongated body 93 as a whole. The gas spring 91 is composed of a main body portion 98 in which high pressure gas such as nitrogen gas is sealed, and a rod portion 99 which moves in and out of the main body portion 98.

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

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

  The pivoting body 106 has an octagonal tubular portion 107 formed with the insertion hole portion 105, and a left and right circular shaft shaped in the form of a horizontal shaft projecting outward on both the left and right sides of the tubular portion 107. The respective shaft-like portions 108 are rotatably attached to the attachment holes 28 a of the projecting plate 28. The rotating body 106 is rotatable with respect to the ground aligning body 4 about the shaft-like portion 108 in the left-right direction.

  Further, the lifting assist means 8 has a moving body (outer pipe) 111 which is inserted into the insertion hole portion 105 of the rotating body 106 and is movable (e.g., slidable) with respect to the long body 93. The movable body 111 is slidably provided on the outer side (outer periphery side) of the elongated body 93 along the outer peripheral surface of the elongated body 93 in the front-rear direction (longitudinal direction of the elongated body). It is done.

  The movable body 111 has a cylindrical portion 112 in the front-rear direction, in which a rotating body 106 is disposed slidably on the outer peripheral side, and a pin hole is formed at the front end of the cylindrical portion 112. 113 are formed. Then, the rod portion of the gas spring 91 is formed by the mounting pin 115 and the retaining pin 116 inserted in the pin hole portion 113, the pin hole portion 114 of the rod portion 99, and the guiding long hole portion 95 of the elongated body 93. Reference numeral 99 is attached to the moving body 111. Therefore, the moving body 111 slides along the outer peripheral surface of the elongated body 93 according to 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 by the guiding long hole 95 of the long body 93.

  In addition, on the outer peripheral surface of the middle portion in the front-rear direction of the cylindrical portion 112, a circular annular rotary member contact portion that pushes up the rotary member 106 based on the biasing force of the gas spring 91 when the lifting assist means 8 is in the assist on state. A certain collar portion 118 is fixed in a projecting manner. Further, at the rear end side of the cylindrical portion 112, the restriction plate mounting portion 120 and the lever mounting portion 121 are fixed. The restriction plate mounting portion 120 is configured of a substantially L-shaped L-shaped plate 123 in which a screw hole portion 122 is formed. The lever attachment portion 121 is configured by a pair of opposing plates 124 that are separated and opposed to each other.

  Then, the control plate mounting portion 120 of the movable body 111 is attached with a lever control plate 125, which is a control portion that restricts more than necessary rotation of the operation lever 90 by contact with the operation lever 90, with mounting screws 126. It is done. A mounting hole portion 127 and a control long hole portion 128 are formed in the lever control plate 125.

  In addition, a substantially L-shaped control lever 90, which an operator holds and manually operates, is rotatably attached to the lever attachment portion 121 of the movable body 111 at the off position (lower position) and the on position (upper position). It is done.

  That is, the control lever 90 is inserted into the mounting hole 124a of the opposing plate 124 of the lever mounting portion 121, the snap ring 130 for retaining is attached to the inserted control lever 90, and the control lever 90 is the lever regulation plate It is inserted into the restriction long hole portion 128 of 125. Thus, the operation lever 90 is rotatable between the off position and the on position with respect to the movable body 111 about the center line X in the front-rear direction (including the front-rear direction) (see FIG. 30).

  The control lever 90 has a lever main body 131 consisting of a round bar bent in an L-shape, and a screw hole 132 is formed in the middle of the lever main body 131. A pin 133, which 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 plate 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, is detachably attached to the lever regulation plate 125 by the attachment means 137. It is attached. The mounting means 137 is composed of, for example, a bolt 138, a nut 139 and a spacer 140, and a gap portion 135 exists between the lever restricting plate 125 and the plate spring 136.

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

  For this reason, when the operation lever 90 is rotated, the collar 134 moves along an imaginary arc centered on the center line X, and at this time, the contact portion 134a of the collar 134 presses the leaf spring 136 and bends and bends. It slides smoothly along the leaf spring 136 while being deformed.

  Then, when the control lever 90 is positioned at the off position or the on position, the leaf spring 136 is restored to the original flat shape by elastic restoring force, and the control lever 90 is moved to its desired position (off position and on Is positioned and held at any position).

  Further, as apparent from FIG. 30, when the operation lever 90 is at 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 the rear end surface As a result, the movement with respect to the elongated body 93 of the moving body 111 is restricted. However, when the control lever 90 is pivoted upward from the off position to the on position, the contact portion 90 a of the control lever 90 is separated from the rear end face 93 a of the elongated body 93, and the movement of the movable body 111 by the control lever 90 Regulation is lifted.

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

  Then, at the time of work to carry out tillage work using the agricultural working machine 1 according to the third embodiment, the operator operates the operation lever 90 to position the lifting assist means 8 by positioning it at the off position. Set to the assist off state.

  After that, when the worker gets on the tractor and moves the agricultural working machine 1 in the traveling direction by traveling the tractor, the tillage body 3 performs the tillage work, and the ground leveling body 4 performs the ground leveling work behind it.

  At this time, the contact portion 90a of the operation lever 90 abuts on the rear end surface 93a of the elongated body 93, whereby the forward movement of the movable body 111 with respect to the elongated body 93 is restricted by the operation lever 90 (ie, the gas spring 91 Since the elongation is restricted, the pivoting body 106 slides in the front-rear direction with respect to the movable body 111 in accordance with the vertical rotation of the ground aligning 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 ground adjusting body 4 rotates in the vertical direction about the shaft 5 with respect to the machine body 2.

  On the other hand, at the time of maintenance such as replacement of the tilling claw 24 or cleaning of the leveling body 4, for example, the operator operates the operation lever 90 to position it in the on position, so that the contact portion 90a is located behind the long body 93. The lifting assist means 8 is set in the assist on state away from the end face 93a.

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

  Then, when the worker lifts up the leveling body 4 to the maximum lifting position with light manual force, the leveling body 4 is automatically locked in the maximum lifting position by the stopper device 53. Also in this example, since the ground adjustment body 4 does not rotate upward to the highest position only by the biasing force of the gas spring 91, it is necessary for the operator to slightly lift it to the highest position manually. Since the spring 91 does not have a free length (maximum length) and biases the leveling body 4 upward, the worker can lift the leveling body 4 to the highest position by light human power It is possible.

  As described above, also with the agricultural work machine 1 according to the third embodiment, the same operation and effect as those of the first and second embodiments can be achieved.

  That is, for example, when the lifting assist means 8 is switched to the assist on state by the operation of the operation lever 90 at the time of maintenance etc., the lifting assist means 8 in the assist on state assists the lifting of the ground body 4. The leveling object 4 can be easily lifted to the highest position, and the burden on the operator can be reduced.

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

  Furthermore, in the assist-off state of the lifting assist means 8 in which the operation lever 90 is at the off position, the movement of the movable body 111 relative to the long body 93 is restricted by the operation lever 90, and the movement 111 is restricted. On the other hand, since the rotating body 106 moves according to the movement of the ground leveling body 4, the lifting assist means 8 does not adversely affect the leveling operation by the ground leveling body 4.

  In addition, in the assist on state of the lifting assist means 8 in which the operation lever 90 is positioned at the on position, the movement of the movable body 111 relative to the long body 93 is permitted, and the movable body 111 for which the movement is permitted is the long body 93 On the other hand, since it moves based on the biasing force of the gas spring 91 together with the rotating body 106, the lifting force of the leveling body 4 can be appropriately assisted utilizing the biasing force of the gas spring 91.

  Furthermore, since the gas spring 91 which is an urging body is housed and arranged in the long body 93 and the whole is always covered by the long body 93, mud etc. adhere to the gas spring 91 at the time of operation. Can be prevented, and damage due to foreign matter etc. can be prevented.

  Further, since the lifting assist means 8 has the plate spring 136 for positioning the operation lever 90, the operation lever 90 can be properly positioned and held at either the off position or the on position, and the operation lever 90 is not careless Rotation can be prevented.

  The operation lever (operation member) 90 is not limited to one provided rotatably on the movable body 111 such that the contact portion 90a is in contact with and separated from the rear end face 93a of the elongated body 93. For example, it may be movable with respect to the mobile body, or removable with respect to the mobile body.

  Further, in any of the above embodiments, the configuration in which one lifting assist means 8 and one contact pressure adjusting means 9 are provided has been described, but the present invention is not limited to this configuration, and the number thereof is arbitrary.

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

  Further, the position at which the lifting assist means 8 is disposed is also optional. For example, the lifting assist means 8 may be disposed at a position on the center side in the left-right direction of the agricultural working machine 1 or the like.

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

  In addition, the agricultural work machine 1 is not limited to one, and may be, for example, a foldable agricultural work machine divided into three, and, for example, from the first ground leveling board (flat plate) and the second ground leveling board (lake) etc. It may be a harrow or the like provided with a ground leveling body.

  Although some embodiments and modifications of the present invention have been described, it is also possible to appropriately combine the embodiments and modifications without departing from the scope of the present invention.

1 Farm work machine 3 Cultivation body 4 Leveling body 8 Lifting assistance means
31 Compression spring which is a biasing body
32, 62 A detachable pin which is a detachable member
35, 65 holes
36, 66, 93
41, 71, 106 Rotating body
42, 72, 105 insertion holes
46, 76, 111 Mobile
61, 91 Gas spring which is a biasing body
90 Operation lever which is the operation member
136 Leaf spring which is an elastic member

Claims (5)

The tillage body which performs tillage work,
A leveling body to be leveled at the rear of this tillage,
A lifting assist means for assisting the lifting of the leveling body;
The lifting assist means is a farm work machine capable of selectively switching between an assist off state and an assist on state,
The lifting assist means has a biasing body for lifting assist,
At least a part of the biasing body is accommodated in the lifting assist means. The lifting assist means has a tubular member,
The agricultural work machine according to claim 1, wherein at least a part of the biasing body is housed in the tubular member. The agricultural work machine according to claim 2, wherein the tubular member covers the entire biasing body at least in the assist-off state. The agricultural work machine according to any one of claims 1 to 3, wherein the lifting assist means is selectively switchable between the assist off state and the assist on state by the operation of the operation member. The lifting assist means is brought into the assist off state by turning the operating member in one direction, and is brought into the assist on state by turning in the other direction of the operation member. Farm work machine of one statement.

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