Agricultural implement

Abstract

To provide an agricultural implement which has a simplified structure and can function even when, external force such as a side part work body is applied thereto.SOLUTION: An agricultural implement is formed of: one regulation mechanism 80; and the other regulation mechanism 90, the former is provided on a center work body 2, the latter is provided on a side part work body 3. An operation part 97 to which an operation pin 82a of the former 80 contacts, is provided on the latter 90. The latter 90 has a rotatable stopper arm 93 where the operation part is provided, and a rotation regulation part 94 provided on one end of the stopper arm, and in a developed state, a rotation permission state is formed, and in middle of rotation, a rotation inhibition state is formed. Therefore, it is possible to prevent twisting of the side part work body to the center work body. The former 80 is arranged so that a second engagement pin 82 on the side part work body in the developed state is at an axial line different from that where a first engagement pin 72 is arranged, therefore, a rotation radius D of a first reception part 73 and a rotation radius d of a third engagement pin 96 are different each other, the side part work body regulates motion of a folding fulcrum part in a direction not related to an axial direction.SELECTED DRAWING: Figure 17

Description

[Technical field]

[0001] The present invention relates to an agricultural machine comprising a side work body and a central work body, and more particularly to a device for ensuring stability in work and preventing unexpected rotation of the side work bodies when they are shifted between an unfolded state and a stowed state. [Background technology]

[0002] In this type of agricultural machinery, the shape of the device changes between the unfolded and stored states, so in order to ensure work safety and efficiency, it is necessary to ensure the stability of the side work body in the unfolded state and to avoid unexpected rotation when transitioning to the stored state.

[0003] In the past, for example, there was an agricultural work machine in which the connecting position was determined by restricting the rotation of the side work body using an abutting member that abuts against a locking member in the deployed state.

[0004] There is also an agricultural machine equipped with a mechanism for restricting the downward rotation of a soil leveling body of a side work body in a stored state.

[0005] First, consider the case where an external force is applied to the locking member and the abutment member of the side working body in the unfolded state in the former case, which causes the locking member and the abutment member to escape from the fixed state. In the former agricultural working machine, the faster the traveling speed and the longer the side working body, the greater the external force generated in the side working body, especially around the folding fulcrum. If the external force becomes larger, it becomes necessary to at least strengthen the pivot fulcrum, the locking member and the abutment member of the side working body. In this case, the weight of the agricultural working machine increases, and it is not possible to maintain the proper ground balance of the traveling body on which the agricultural working machine is attached, which is a drawback that hinders safe traveling.

[0006] In the latter case, the rotation control means for restricting the downward rotation of the leveling body may have a long rod portion or a pin-shaped portion deformed by the weight of the leveling body when in the stored state, which has the disadvantage that the normal operation of the rotation control means may be hindered. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2019-170186 A [Patent Document 2] JP 2013-220071 A Summary of the Invention [Problem to be solved by the invention]

[0008] In view of the above-mentioned background, an object of the present invention is to provide an agricultural work machine that has a simple configuration but can function properly even when a large external force is applied to the side work body and related members.

[0009] Specifically, the objective is to prevent twisting of the side working bodies relative to the central working body when in the deployed state, to ensure stable transition of the side working bodies in the intermediate state between the rotation permitted state and the rotation prevented state, and to avoid unforeseen rotation.

[0010] Another object of the present invention is to stabilize the side working body in the deployed state. [Means for solving the problem]

[0011] In order to solve the above problems, the agricultural working machine according to the present invention is an agricultural working machine comprising a central working body provided with a folding fulcrum section, and a side working body provided so as to be rotatable with respect to the central working body by the folding fulcrum section, a set of rotation restriction mechanisms for restricting the rotation of the side working body is provided on one side of the folding fulcrum section, the set of rotation restriction mechanisms being made up of one restriction mechanism and another restriction mechanism, the one restriction mechanism being provided on the central working body and the other restriction mechanism being provided on the side working body, the one restriction mechanism and the other restriction mechanism being provided with an engaging protrusion on one side and an engaging protrusion on the other side. The regulating mechanism has an engaging recess provided therein and has a detachable engaging relationship with respect to each other, an operating portion against which an operating pin provided on the one regulating mechanism abuts is provided on the other regulating mechanism, the other regulating mechanism has a rotatable stopper arm on which the operating portion is provided and a rotation regulating portion provided on one end of the stopper arm, and is characterized in that a rotation-permitted state is formed when the engaging protrusion is engaged with the engaging recess, and a rotation-prevented state is formed midway between the deployed state and the stored state when the engaging protrusion is not engaged with the engaging recess. The agricultural work machine according to claim 2 is characterized in that, in the agricultural work machine according to claim 1, another regulating mechanism is provided on the other side of the folding fulcrum portion, and the another regulating mechanism comprises a male part and a female part, the male part is provided on either the central working body or the side working body and the female part is provided on the other, the male part comprises a protrusion having another engaging pin, and the female part comprises a fixing member having an engaging hole into which the another engaging pin is detachably engaged, and a rotatable hook member provided with a locking part that covers and engages the another engaging pin. The agricultural work machine according to claim 3 is the agricultural work machine according to claim 1 or 2, characterized in that an elastic body is provided in the another regulating mechanism for biasing the stopper arm so as to rotate it in a vertical direction. In addition, the agricultural working machine described in claim 4 is characterized in that, in the agricultural working machine described in claim 1 or claim 2, when the operating part is pressed by the operating pin and the rotation restricting part is positioned above the protrusion, a rotation allowing state is formed in which the leveling body rotates up and down. In addition, the agricultural work machine according to claim 5 is characterized in that, in the agricultural work machine according to claim 1 or claim 2, when the operating part is pressed by the operating pin and the contact limit point between the rotation restricting part and the protrusion is reached, this is the end point of the rotation permitted state. In addition, the agricultural working machine described in claim 6 is characterized in that, in the agricultural working machine described in claim 1 or claim 2, when the operating part is pressed by the operating pin and the rotation regulating part is positioned below the top of the protrusion, a rotation prevention state is formed in which the leveling body cannot rotate up and down. The agricultural work machine according to claim 7 is characterized in that in the agricultural work machine according to claim 1, the first regulating mechanism and the second regulating mechanism are provided on the rear side of the cover body in the traveling direction of the machine body. The agricultural work machine according to claim 8 is the agricultural work machine according to claim 2, characterized in that the separate regulating mechanism is provided on the front side of the cover body in the traveling direction of the machine body. Effect of the Invention

[0012] For convenience, the following description will be given using the symbols used in the embodiment section. In the present invention, a set of rotation restriction mechanisms consisting of one restriction mechanism (second restriction mechanism 80) and another restriction mechanism (third restriction mechanism 90) is provided on one side of the folding support part 10, specifically on the rear side in the traveling direction, with the second restriction mechanism 80 provided on the central working body 2 and the third restriction mechanism 90 provided on the side working body 3, and the second restriction mechanism 80 and the third restriction mechanism 90 have a detachable engagement relationship with each other, with an engagement protrusion provided on one side and an engagement recess provided on the other side, and the operation mechanism provided on the one restriction mechanism The other regulating mechanism has an operating part with which the pin comes into contact, a rotatable stopper arm on which the operating part is provided, and a rotation regulating part provided at one end of the stopper arm, and a rotation permitted state is formed when the engaging protrusion is engaged with the engaging recess in the deployed state, and a rotation prevented state is formed during rotation between the deployed state and the stored state when the engaging protrusion is not engaged with the engaging recess, which has the effect of preventing twisting of the side working body relative to the central working body. In other words, since the direction in which the side working body is pushed backward is different from the direction in which the side working body rotates around the folding fulcrum axis of the folding fulcrum part (shown as arrow a in Fig. 18), a force (twist) inclined with respect to the direction of the folding fulcrum axis shown by the two-dot chain line in Fig. 17 is applied to the folding fulcrum part 10, but since the second regulating mechanism is located behind the folding fulcrum part, this twisting can be received and regulated.

[0013] Furthermore, the second restricting mechanism 80 is disposed so that the second engagement pin 82 of the side working body in the unfolded state has a different axis from the first engagement pin 72 in a side view, so that the rotation radius D of the first receiving portion 73 is different from the rotation radius d of the third engagement pin 96. In other words, as shown in Figure 16, since the second restricting mechanism 80 is disposed within the rotation radius D of the first restricting mechanism 70 centered on the folding fulcrum part 10, the second restricting mechanism 80 can be positioned on the cover body, and rotation d (particularly downward rotation) about the axis of the folding fulcrum part 10 and movement of the side working body in a direction unrelated to the axial direction of the folding fulcrum part can be effectively restricted.

[0014] The third restricting mechanism 90 is composed of a rotatable stopper arm 93, a rotation restricting portion 94 provided at one end of the stopper arm, and an operating portion 97 abutting against the operating pin 82a at the other end, so that the side working body 3 can be stably moved between the rotation permitted state and the rotation prevented state. When the side working body is in the deployed state, the third restricting mechanism moves the rotation restricting portion 94 upward away from the cover body by pressing the operating portion 97 of the stopper arm against the operating pin 82a. In this position, even if the protrusion 91 provided on the first side leveling body rotates together with the first side leveling body 19a', the rotation restricting portion 94 cannot come into contact with it (FIG. 20), so the first side leveling body can rotate up and down without being restricted, and the leveling body can level the work surface.

[0015] The first restricting mechanism 70 is composed of a male part 70A and a female part 70B on the other side of the folding fulcrum part 10, specifically the front side in the traveling direction, the male part being a plate-like protrusion 71 having another engaging pin 72, the female part being a fixed member 74 having a fitting hole 73 into which the other engaging pin 72 is detachably fitted, and a rotatable hook member 75 provided with a locking part 76 that covers and engages with the other engaging pin 72, thereby stabilizing the deployed state of the side working body 3. That is, the first engaging part 71 and the first receiving part 73 prevent the side working body from moving downward, and the hook member 75 of the fixed member 74 engages with the first engaging pin 72 to prevent it from rotating upward, thereby stabilizing the deployed state. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a front view of an agricultural work machine according to the present invention in an unfolded state. [Diagram 2] FIG. 2 is a rear view of FIG. [Diagram 3] FIG. 2 is a side view of FIG. [Figure 4] FIG. 4 is a cross-sectional view of a main part of FIG. [Diagram 5] 4 is a view taken in the direction of the arrow a in FIG. 3, in which (A) shows the deployed state, and (B) shows a state in the middle of rotation between the deployed state and the stored state. [Figure 6]FIG. 2 is a front view of the agricultural work machine according to the present invention in a stored state. [Figure 7] FIG. 7 is a side view of FIG. 6. [Figure 8] FIG. 8 is an enlarged view of a main part of FIG. [Figure 9] (A) is a drawing of the first link, (B) is a drawing of the second link, and (C) is a drawing of the third link. [Figure 10] FIG. 4 is a view taken in the direction of the arrow a in FIG. [Figure 11] FIG. 4 is a view taken in the direction of the arrow b in FIG. [Figure 12] FIG. 4 is a hydraulic circuit diagram of a cylinder mechanism of a side working body. [Figure 13] 1. (A) is an enlarged plan view of the main parts of the second restriction mechanism (the second restriction mechanism is in an engaged state) and the third restriction mechanism (the third restriction mechanism is in a rotation-permitted state) on the left side of the traveling direction of FIG. 1 in the unfolded state, and (B) is a rear view of (A). [Figure 14] 1A is a plan view showing a state in the middle of rotation between the deployed state and the stored state in which the second restriction mechanism is in a disengaged state and the third restriction mechanism is in a rotation-preventing state, and FIG. [Figure 15] 13 is a diagram showing the first receiving portion and the first engagement pin coming into contact with each other and entering an engaged state. FIG. [Figure 16] 4 is a view taken along the arrow a in FIG. 3, showing the rotation direction of the first engagement portion. [Figure 17] FIG. 4 is a view taken along the arrow c in FIG. 3, illustrating the effect of the second restriction mechanism and showing a schematic diagram of a state in which the side working body is pushed from the front. [Figure 18] 13A and 13B are diagrams for explaining the effect of the second restriction mechanism, and are schematic diagrams showing a state in which the side working body rotates in the horizontal direction. [Figure 19] 13 is a diagram for explaining the effect of the second restricting mechanism, and diagrammatically shows the direction of a component force that attempts to rotate the side working body about the folding fulcrum axis when pressed by the working surface. FIG. [Figure 20] 10A and 10B are diagrams illustrating the effect of the third restriction mechanism, where FIG. 10A is an enlarged side view showing a state in which rotation is prevented by the third restriction mechanism, and FIG. 10B is an enlarged side view showing a state in which the rotation is prevented by the third restriction mechanism and the mechanism is released. [Figure 21]10A to 10C are diagrams showing the positional relationship between the rotational state of the side working body and the third regulating mechanism with respect to the effect of the third regulating mechanism, where (A) shows the deployed state, (B) shows the state midway between the deployed state and the stored state, and (C) shows the stored state. [Figure 22] 10A to 10D are diagrams showing the transition from a rotation-permitted state to a rotation-prevented state in relation to the effect of the third restriction mechanism, where (A) shows the rotation-permitted state, (B) shows the end point of the rotation-permitted state, (C) shows the rotation-prevented state, and (D) shows a further rotation-prevented state. [Diagram 23] FIG. 4 is a cross-sectional view of the side working body in the deployed state, showing the rotation-permitted state. [Figure 24] 11 is a cross-sectional view of the side working body going from the deployed state to the stored state, showing the rotation-prevented state. FIG. BEST MODE FOR CARRYING OUT THEINVENTION

[0017] Next, the agricultural machine according to the present invention will be described in more detail with reference to the drawings showing the embodiment. For convenience, parts having the same functions are given the same reference numerals and their description will be omitted.

[0018] The agricultural work machine 1 is coupled to a tractor (not shown) and is guided to move and perform agricultural work in a farm field.

[0019] 1 to 9, the agricultural work machine 1 comprises a central working body 2 and side working bodies 3 of the same configuration provided on both sides of the central working body 2. The central working body 2 has a pipe frame 21 horizontally installed in a direction perpendicular to the traveling direction, and a speed change unit 22 is provided in the center. A top mast 23 is provided at the tip of the speed change unit 22. Reference numeral 24 denotes a top pin. A driving force input shaft 25 is provided at the base end of the speed change unit 22. A cylinder 9, which will be described later, is provided on both sides of the speed change unit 22. Reference numeral 26 denotes a second pipe frame, which is horizontally installed parallel to the pipe frame 21. The pipe frame 26 has lower pins 27 provided on both sides of the speed change unit 22. Reference numeral 28 denotes a cover body.

[0020] The side working body 3 is provided rotatably relative to the central working body 2 and, as described later, is provided so as to be fixable or detachable on both sides of the central working body 2. Reference numeral 31 denotes a pipe frame of the side working body 3 provided on both sides of the pipe frame 21 of the central working body 2, and is provided on the same extension line as the longitudinal direction of the pipe frame 21.

[0021] Reference numeral 10 denotes the folding fulcrum part 10, which is provided on the front side with a first restriction mechanism 70 consisting of a male part 70A and a female part 70B that restricts the movement of the side working body 3 (Fig. 1). As shown in Figs. 3 to 6, the male part 70A consists of a first engagement part 71 protruding from the end part on the front side in the traveling direction of the cover body 28 of the central working body 2, and a first engagement pin 72 provided horizontally on the first engagement part 71. As shown in Fig. 6, the first engagement part 71 is made up of two plate-like bodies provided upright, and the first engagement pin 72 provided horizontally on the upper part is hung across it.

[0022] On the other hand, a plate-shaped fixing member 74 is fixed to the cover body 32 of the side working body 3, and a semicircular first receiving portion 73 that engages with the first engagement pin 72 is recessed at the end of the fixing member 74 on the male part 70A side. 75 is a rotatable hook member, and a locking portion 76 is provided at its tip, which has a semicircular hook hole 76a that engages with the first engagement pin 72 so as to cover it. A spring 77 that is biased toward the first receiving portion 73 is interposed between the fixing member 74 and the hook member 75, and prevents the locking portion 76 from being unintentionally released due to vibration or impact during work. The fixing member 74, hook member 75, locking portion 76, and spring 77 constitute the female part 70B.

[0023] When the side working body 3 is in the deployed state, the first engagement pin 72 engages with the first receiving portion 73, thereby preventing the side working body 3 from moving downward, and the first engagement pin 72 is engaged and locked by the locking portion 76 of the hook member 75, thereby preventing the side working body 3 from rotating upward, and the deployed state of the side working body 3 is stabilized.

[0024] A pair of rotation restriction mechanisms consisting of a second restriction mechanism 80, which is a female mechanism, and a third restriction mechanism 90, which is a male mechanism, are provided on the back side of the folding support portion 10, i.e., on the rear side in the traveling direction, to restrict the movement of the side working body 3 (FIG. 2). As shown in FIGS. 6 to 8 and 13 and subsequent figures, the second restriction mechanism 80 consists of a second engagement portion 81 protruding from the end portion on the rear side in the traveling direction of the cover body 28 of the central working body 2, and a second engagement pin 82 provided horizontally on the second engagement portion 81. The second engagement portion 81 is formed of two plate-like bodies as shown in FIG. 8, and the second engagement pin 82 provided horizontally on the upper portion is hung between them (FIG. 13). 82a is an operating pin provided by being wound around the second engagement pin 82. 83 is a second receiving portion consisting of a semicircular recess provided on the end portion of the second engagement portion 81 on the third restriction mechanism side (FIG. 13). Reference numeral 84 denotes a support member (shown in FIG. 8) that supports the second engagement portion 81, and 85 denotes a reinforcing member for the second receiving portion 83 (shown in FIG. 17). In FIG. 16, reference numeral 2a denotes a central fulcrum frame of the central working body 2, and 3a denotes a side fulcrum frame of the side working body 3.

[0025] On the back side of the folding fulcrum portion 10, a third regulating mechanism 90, which is a male mechanism, is provided adjacent to the second regulating mechanism 80 to regulate the movement of the side working body 3 (FIG. 2). That is, as shown in FIG. 8 and FIG. 13, the third regulating mechanism 90 has a triangular pyramid-shaped protrusion 91 fixed to the top of the first leveling body 19a' that is rotatable up and down at the end of the cover body 32 on the rear side in the traveling direction of the cover body 32 of the side working body 3, and a third engaging portion 92 having a third engaging pin 96 is protrudingly provided at the end of the cover body 32 on the second regulating mechanism 80 side. An elastic body 95 is interposed between the third engaging portion 92 and the stopper arm 93, which is biased so as to rotate the stopper arm 93 up and down. One end of the stopper arm 93 is a rotation regulating portion 94 that is integrally formed and protrudes toward the protrusion 91 side. Reference numeral 93a denotes a pivot point of the stopper arm 93, and 93b denotes a pivot axis of the stopper arm 93. The third engagement pin 96 is provided at an end of the third engagement portion 92 on the second restriction mechanism 80 side, and fits into the second receiving portion 83 of the second restriction mechanism 80 in the deployed state. Reference numeral 97 denotes an operation portion, which is fixed to the stopper arm 93 and rotates integrally with the stopper arm 93. The operation portion 97 presses the operation pin 82a when it comes into contact with the second engagement pin 82. The third restriction mechanism 90 is composed of the protrusion 91, the third engagement portion 92, the stopper arm 93, the rotation restriction portion 94, and the elastic body 95 described above. The second regulating mechanism 80 and the third regulating mechanism 90 provided at the left and right ends of the central working body 2 have the same configuration, that is, the left and right ends of the central working body 2 have a mirror structure.

[0026] A link mechanism 7 consisting of a first link 4, a second link 5 and a third link 6 is provided at the folding end 31a (shown in Figure 4) provided in the center of the pipe frame 21 and the pipe frame 31, as best shown in Figure 9.

[0027] The first link 4, which functions as a pivot frame, is a pivotable link member consisting of a rectangular main body 4a and an inclined portion 4b formed integrally with the main body 4a and inclined relative to the main body 4a, and is provided in pair at the front and rear of the cylinder 9 (front and rear in the direction indicated by the arrow in FIG. 1). A pivot hole 4c into which a pivot 42 (FIG. 1) is pivotally fitted is provided at the base end of the main body 4a, and a pivot hole 4d into which a pivot 64 (FIG. 1) of a third link 6 described later is fitted is provided at the other end. An oval first long hole 41 is provided in the longitudinal direction of the inclined portion 4b, i.e., toward the pivot hole 4d. A connecting pin 8 (FIG. 1) is loosely fitted in the first long hole 41, and a first position 41a is formed on the base end side (lower portion in FIG. 9) and a second position 41b is formed on the opposite side (upper portion in FIG. 9). The rotation hole 4d is a rotation hole corresponding to the rotation hole 62a of the third link 6. The length of the first elongated hole 41 in the longitudinal direction is desirably small, about twice or less the diameter of the connecting pin 8, and in this embodiment, it is 1.6 times the diameter.

[0028] The second link 5 functioning as the side fulcrum frame is made of a rotatable link member formed in a long length, with one end provided with a rotation hole 5a into which the rotation fulcrum 51 is rotatably fitted, and the other end provided with a rotation hole 5b into which the connecting pin 8 is rotatably fitted. The second links 5 are provided in pairs at the front and rear of the cylinder 9 (at the front and rear in the direction indicated by the arrow in FIG. 1).

[0029] The third link 6 is a rotatable link member, and is composed of a long connecting portion 61 and a link portion 62 provided at the tip end side of the connecting portion 61 perpendicular to the connecting portion 61. The link portion 62 is provided with a second oblong hole 63 along the longitudinal direction of the connecting portion 61. The first oblong hole 41 and the second oblong hole 63 intersect with each other. The connecting pin 8 is loosely fitted into the second oblong hole 63, and a third position 63a is formed on the connecting portion 61 side (lower part in FIG. 9) and a fourth position 63b is formed on the opposite side (upper part in FIG. 9). That is, the third position 63a is formed at a position where the rotation radius is small, and the fourth position 63b is formed at a position where the rotation radius is large, with the rotation fulcrum 64 of the third link 6 as the center. In other words, the third position 63a is formed at a position close to the rotation fulcrum 51 of the second link 5, and the fourth position 63b is formed at a position far from the rotation fulcrum 51 of the second link 5. As a result, the longitudinal directions of the first elongated hole 41 and the second elongated hole 63 are arranged to intersect.

[0030] The third link 6 also moves relative to the second long hole 63 in conjunction with the movement of the connecting pin 8 inside the first long hole 41. In other words, the connecting pin 8 moving through the first long hole 41 also moves inside the second long hole 63 at the same time, whereby the third link 6 rotates relative to the first link 4.

[0031] 10 and 11, a rotation hole 62a into which the rotation fulcrum 64 is rotatably fitted is provided in the third link 6 between the rotation fulcrum 42 of the first link 4 and the first long hole 41. Since the third link 6 rotates about the rotation fulcrum 64, the positional relationship between the rotation fulcrum 42 and the rotation fulcrum 64 does not change even if the side working body 3 rotates. The rotation fulcrum 64 is rotatably fitted into the fitting holes 4d, 62a of the first link 4 and the third link 6.

[0032] A connecting rod 11 is rotatably connected to the base end of the connecting portion 61 of the third link 6. Reference numeral 65 denotes a hole for connecting a connecting rod 9 (FIG. 9). A tip end 11a of the connecting rod 11 is connected to a hook member 75 rotatably provided at the lower end of the cover body 32 of the side working body 3 (FIG. 8). Thus, the third link 6 rotates about the rotation fulcrum 64, thereby rotating the hook member 75.

[0033] The first link 4 and the second link 5 are provided as a pair at the front and rear of the cylinder 9 in the direction of travel of the aircraft as indicated by the arrow in FIG. 1 in order to prevent an unbalanced load from occurring in the front-to-rear direction due to the projection and retraction of the cylinder 9.

[0034] In this embodiment, the third link 6 is provided on the outside of the first link 4 (outside in the forward and backward direction of the traveling direction), and the connecting rod 11 connected to the third link 6 is provided to pass between the pipe frame 31 and the cover body 32 of the side working body 3. This is to prevent the connecting rod 11 from being arranged so as to be stacked above the pipe frame 21. In other words, since the connecting rod 11 is not arranged on the outside of the agricultural working machine 1, it becomes difficult for people to touch it, unexpected deformation is prevented, and also a design effect is achieved in terms of appearance.

[0035] Reference numeral 8 denotes a connecting pin 8 of the link mechanism 7 which rotatably connects the first link 4, the second link 5, and the third link 6. That is, as best shown in Fig. 11, the connecting pin 8 is a common pin which passes through the first elongated hole 41, the second elongated hole 63, and the pivot hole 5b and rotatably connects the first link 4, the third link 6, and the second link 5.

[0036] The side working body 3 is deployed and fixed in a working state by a rotating operation to be described later, and is folded and stored in a non-working state.

[0037] Reference numeral 9 denotes a cylinder provided on the side working body 3, which rotates the side working body 3. The cylinder 9 has a fulcrum portion 9a where a cylinder fulcrum 9b is formed on the pipe frame 21 of the central working body 2. Reference numeral 9c denotes a cylinder rod provided at the tip of the cylinder 9, which moves back and forth by pressure oil sent from a pump (not shown). The cylinder rod 9c is connected to the second link 5, and its moving back and forth rotates the side working body 3 via the second link 5 and the first link 4.

[0038] Reference numeral 10 denotes a folding fulcrum portion of the link mechanism 7. That is, as shown in Fig. 11, the folding fulcrum portion 10 is configured by rotatably inserting a pin 10a through an overlapping portion between a folding end portion 21a of the pipe frame 21 of the central working body 2 provided within the first link 4 and a folding end portion 31a of the pipe frame 31 of the side working body 3 provided within the folding end portion 21a.

[0039] Reference numeral 11 denotes a connecting rod of a predetermined length connected to the third link 6, and as shown in Fig. 3, a tip end 11a is rotatably engaged with a hook member 75 provided on the cover body 32 of the side working body 3. The connecting rod 11 may be one that can be extended and retracted to a predetermined length by a screw portion.

[0040] As shown in Fig. 5, the ends of the central working body 2 and the side working bodies 3 on the connecting side are provided with a mechanism for fixing or releasing the connection. That is, the end 2b on the connecting side of the cover body 28 on the central working body 2 side is provided with a first engagement part 71 with a protruding top for smooth rotation, and a first engagement pin 72 is protruding from the tip. On the other hand, the cover body 32 on the side working body 3 side is provided with a fixing member 74 having a recessed first receiving part 73 that engages with the first engagement pin 72. The fixing member 74 is provided with a rotatable hook member 75. A hook hole 76a is formed in one end of the hook member 75, which is engaged with the first engagement part 71 when the two are connected and fixed, and is removed from the first engagement part 71 when the two are released. The tip part 11a of the connecting rod 11 is rotatably engaged with the base end of the hook member 75.

[0041] In Fig. 3, 18 denotes a tilling unit, which is made up of a rotatable rotor shaft 18a and tines 18b attached to the rotor shaft 18a. 19 denotes a ground leveling body, which is made up of a first ground leveling body 19a on the upper level and a second ground leveling body 19b on the lower level that are rotatably connected together. 20a shown in Fig. 1 etc. denotes a chain case for the central working body 2, and 20b denotes a chain case for the side working body 3.

[0042] Figure 10 is a hydraulic circuit diagram of the cylinder 9. For convenience, only the circuit of the cylinder that rotates one of the side working bodies 3 is shown. In the figure, 9d denotes a directional control valve, P is connected to the pump side of a tractor (not shown), and T is connected to the tank side of the same.

[0043] Next, the operation of each part of the agricultural work machine 1 according to the above embodiment will be described with reference to Figs. 13 to 24. In the drawings, P denotes a vertical line (Figs. 7, 17, and 18), q denotes the fulcrum axis of the folding fulcrum part (Fig. 18), D denotes the rotation radius of the first receiving part 73 of the first regulating mechanism 70 relative to the fulcrum axis q (Figs. 7, 4, and 16), d denotes the rotation radius of the second engaging part 81 of the second regulating mechanism 80 relative to the fulcrum axis q (Figs. 7, 4, and 16), and r denotes the rotation radius of the protruding part 91 relative to the rotation fulcrum of the first ground leveling body 19a' (Figs. 23 and 24).

[0044] Next, the effects of each regulation mechanism will be described with reference to FIG. 13 and subsequent figures. 13 is an enlarged view of the main parts of the second restriction mechanism 80 and the third restriction mechanism 90 as viewed from above perpendicular to the axial direction of the second engagement pin 82. At this time, the side working body 3 is in an unfolded state, the second restriction mechanism 80 is in an engaged state, and the third restriction mechanism 90 is in a rotation-permitted state. 14 is an enlarged view of the main parts of the second restriction mechanism 80 and the third restriction mechanism 90, seen from above perpendicular to the axial direction of the second engagement pin 82. At this time, the side working body 3 is in the middle of rotating, with the second restriction mechanism 80 in a disengaged state and the third restriction mechanism 90 in a rotation-preventing state. FIG. 15 shows the periphery of the first engagement portion 71 from the front in the rotation axis direction of the fixed member 74 of the first restriction mechanism 70 when the side working body is in the deployed state, and shows the first engagement pin 72 and the first receiving portion 73 in an engaged state. In this specification, the "rotation permitted state" is a state in which rotation of the first ground leveling body 19a' is permitted, and the "rotation prevented state" is a state in which rotation of the first ground leveling body 19a' is prevented.

[0045] <Effect of the second regulation mechanism 80> First, the effect of the second restriction mechanism 80 is to prevent the side working body 3 from being twisted relative to the central working body 2. This will be described in detail with reference to FIG. In Fig. 18, as the side working body 3 advances, it is pushed in the direction indicated by the arrow m behind the direction of travel. The side working body 3 can be considered a free end member supported by the folding fulcrum section 10, the first regulating mechanism 70, and the second regulating mechanism 80, which are the connection points, with respect to the central working body 2, as fulcrums, so that the side working body 3 is in a state where it is pushed around a vertical line P, which is an axis perpendicular to the work surface. Since the vertical line P is an axis perpendicular to the direction of travel (indicated by the arrow U in Fig. 18), the free end-like side working body 3 is in a state where it is pushed around the vertical line P. In other words, the side working body 3 supported by the folding fulcrum portion 10, the first regulating mechanism 70, and the second regulating mechanism 80 as the pivot fulcrum portion is pushed rearward in the traveling direction (shown as arrow F in Figure 18) as described above, so that in a plan view, the central working body 2 and the side working body 3 tend to move relative to each other in a direction away from each other near the first regulating mechanism 70, and in a direction toward each other near the axis q of the folding fulcrum portion 10 and the second regulating mechanism 80. In other words, the direction in which the side working body 3 tries to rotate horizontally around the vertical line P due to the direction m of pushing the side working body 3 backward (shown as arrow b in FIG. 18) is different from the direction of rotation of the side working body 3 which rotates around the folding fulcrum axis q of the folding fulcrum unit 10 distributed from the direction m of pushing the side working body 3 backward (shown as arrow a in FIG. 18), so a force inclined with respect to the direction of the folding fulcrum axis q shown by the two-dot chain line in FIG. 17 is applied to the folding fulcrum unit 10 (this is called "twist" in this specification). In FIG. 18, the arrow a indicates the direction in which the side working body 3 rotates upward on the fulcrum axis of the folding fulcrum unit 10. The arrow b indicates the direction in which the side working body 3 rotates horizontally due to the working surface. The arrow U indicates the upward direction relative to the traveling direction, the arrow F indicates the forward direction, and the arrow R indicates the rightward direction. The position of the vertical line P is on the side of the support member, between the first regulating mechanism 70 and the second regulating mechanism 80, but this position may differ from that shown in the figure depending on the position and direction in which the side working body 3 is pushed.

[0046] The first engagement portion 71 can be disposed at the front end of the cover bodies 28, 32, which is the location that is the furthest away from the folding fulcrum portion 10 of the side working body 3 when the first engagement portion 71 is positioned on the central cover body 28 and the side cover body 32 in a side view. Therefore, when the side working body 3 is about to rotate around the axis of the folding fulcrum portion 10, the pressing force applied between the first engagement portion 71 and the first receiving portion 73 and the stress applied when the first engagement portion 71 is fixed to the fixing member 74 are not excessively large. In other words, there is no need to make the first engagement portion 71, the first receiving portion 73, and the fixing member 74 excessively strong. In addition, since the first engagement portion 71 is positioned on the cover bodies 28, 32, it is also possible to prevent mud splashes that may occur from below from directly hitting the first engagement portion 71.

[0047] When the side working body 3 receives a load toward the rear side during agricultural work in the unfolded state, for example, due to being pressed against a work surface or coming into contact with an obstacle, the side working body 3 will tend to twist toward the rear side relative to the central working body 2 regardless of the axial direction of the folding fulcrum part 10. In other words, the rear end part of the side working body 3 will tend to approach the rear end part of the central working body 2 even closer. In this case, since the second regulating mechanism 80 is located behind the folding fulcrum part 10, it can receive and regulate this twisting. Specifically, the second receiving part 83 of the central working body 2 comes into contact with the third engagement pin 96 provided on the side working body 3, thereby receiving and regulating the twisting.

[0048] In FIG. 19, the side working body 3 is in an unfolded state. Since the second regulating mechanism 80 is disposed at the rear of the cover body 32, it is possible to effectively regulate the movement of the side working body 3 in a direction unrelated to the axial direction of the folding fulcrum portion 10, for example, in a direction in which the side working body 3 rotates around a vertical line P with respect to the work surface, which is an axis near the center of the front and rear of the cover bodies 28, 32. For example, when the side working body 3 receives resistance from mud working from the front to the rear as the machine advances, the free end-shaped side working body 3 tries to rotate horizontally toward the rear around the vertical line P. At this time, the second receiving portion 83 of the second regulating mechanism 80, which is located rearward of the vertical line P, abuts against the third engaging pin 96 of the third regulating mechanism 90, thereby regulating the horizontal rotation of the side working body 3. In other words, the second regulating mechanism 80 and the third regulating mechanism 90 can prevent the side working body 3 from rotating in a horizontal direction, which is a direction inclined with respect to the folding fulcrum axis q of the folding fulcrum portion 10. As a result, no force C2 is applied to the folding fulcrum portion 10 to rotate it in a direction inclined relative to the folding fulcrum axis q, and no force C1 is applied to rotate it about the folding fulcrum axis q, so no "twisting" force is applied to the folding fulcrum portion 10 (Fig. 19). In Fig. 19, arrow C1 indicates the direction of the component force that rotates the folding fulcrum portion 10 around its axis as a result of the working surface pushing the side working body 3 backward, C2 indicates the direction in which the working surface pushes the side working body 3, and C3 indicates the direction of the resulting force (twist) applied to the folding fulcrum portion 10. The working surface of the side working body 3 is pushed backward, but due to the distribution of forces described above, a downward force C3 acts on the folding fulcrum portion 10. In this specification, this is called "twisting."

[0049] The second regulating mechanism 80 can also prevent the side working body 3 from pivoting downward about the folding fulcrum portion 10, and by cooperating with the first regulating mechanism 70, can prevent the side working body 3 from pivoting slightly upward about the folding fulcrum portion 10 (Figure 19).

[0050] As shown in Fig. 16, the second engagement pin of the side working body 3 in the unfolded state is disposed so as to have a different axis from the first engagement pin 72 in a side view, so that the rotation radius D of the first receiving portion 73 is different from the rotation radius d of the third engagement pin 96. In other words, as shown in Fig. 16, the second restriction mechanism 80 is disposed within the rotation radius D of the first restriction mechanism 70 centered on the folding fulcrum part 10, so that the second restriction mechanism 80 can be positioned on the cover body 32, and rotation around the axis of the folding fulcrum part 10 (particularly downward rotation) and movement of the side working body 3 in a direction unrelated to the axial direction of the folding fulcrum part 10 can be effectively restricted. Note that in Fig. 16, the arrow T indicates the rotation direction of the side working body 3.

[0051] That is, since the third engagement pin 96 and the second receiving portion 83 are simply in contact with each other in the unfolded state, the downward rotation of the side working body 3 about the folding fulcrum portion 10 can be restricted. In this case, if the side working body 3 is to be stopped only by the abutment between the third engagement pin 96 and the second receiving portion 83, which are disposed within the rotation radius of the first restricting mechanism 70 about the folding fulcrum portion 10, it is necessary to strengthen the member strength. However, in this embodiment, the side working body 3 can be restricted from rotating downward about the folding fulcrum portion 10 of the side working body 3 together with the first restricting mechanism 70, so that the force due to the twisting can be distributed and received by the first restricting mechanism 70 and the second restricting mechanism 80. Therefore, both the first restricting mechanism 70 and the second restricting mechanism 80 can be constructed without being excessively strong.

[0052] It is also possible to restrict a force that tends to rotate the side working body 3 horizontally backward in a direction unrelated to the axial direction of the folding fulcrum part 10. Therefore, the movement of the side working body 3 that tends to rotate horizontally backward about the vertical line P can be received by the second restriction mechanism 80 located behind the vertical line P, particularly by the abutment of its second receiving portion 83 with the third engagement pin 96. Therefore, it is possible to effectively restrict the rotation around the axis of the folding fulcrum part 10, particularly downward, and the movement of the side working body 3 in a direction unrelated to the axial direction of the folding fulcrum part 10, and no force is generated in the folding fulcrum part 10 in a direction different from the rotation direction.

[0053] The side working body 3 in the unfolded state is connected to the central working body 2 by three connection points or pressure points. That is, it is connected by the folding fulcrum part 10, the first regulating mechanism 70, and the second regulating mechanism 80. Therefore, when connecting the central working body 2 and the side working body 3, the two-point connection between the folding fulcrum part 10 and the first regulating mechanism 70 is more effective than the single connection point only at the folding fulcrum part 10, and the three-point connection between the folding fulcrum part 10, the first regulating mechanism 70, and the second regulating mechanism 80 is more effective than the two-point connection between the folding fulcrum part 10 and the first regulating mechanism 70. In other words, in this case, the force acting on each part can be supported with reduced force, so there is no need to make the strength of the folding fulcrum part 10 and the surrounding members constituting the folding fulcrum part 10 excessively strong. This is why the second regulating mechanism 80 allows the side working body 3 to withstand loads in directions other than the axial direction of the folding fulcrum part 10.

[0054] Since the second regulating mechanism 80 and the first regulating mechanism 70 are located on the cover bodies 28, 32, it is possible to suppress the adhesion of mud that would otherwise be scattered during agricultural work, and to prevent the rotation of the side working body 3 from being improperly regulated, i.e., to prevent the side working body 3 from being unrestricted in the original regulating position and from being unable to form a normal deployed state. To elaborate on this point, foreign matter may fly upward from the tilling section 18 or the mud being tilled. For example, if the first regulating mechanism 70 and the second regulating mechanism 80 are located below the cover bodies 28, 32, there is a high possibility that the scattered foreign matter will adhere to the contact surfaces, i.e., between the engaging parts and the receiving parts, and if this state occurs, there is a possibility that the regulating position will change. In other words, when the side working body 3 is to be put into the deployed state as viewed from the front, the side working body 3 will not be horizontal, and it will not be possible to regulate it in the horizontal position that is the originally intended position.

[0055] <Effects of the third regulatory mechanism> The effect of the third restricting mechanism 90 is that the side working body 3 can transition stably in the intermediate state between the rotation permitted state and the rotation prevented state. The third restricting mechanism 90 prevents the first leveling body 19a of the side working body 3 from freely rotating and sagging when transitioning to the stored state. The first leveling body 19a' of the side working body 3 can be fixed integrally with the side working body 3, so unexpected rotation is prevented even if it is moved in the stored state. The effect of the third regulating mechanism 90 will be described in detail with reference to Fig. 20. When the side working body 3 is in the unfolded state, the operation part 97 of the stopper arm 93 of the third regulating mechanism 90 is pressed by the operation pin 82a, so that the rotation regulating part 94 moves upward away from the cover bodies 28, 32. In this position, even if the protrusion 91 provided on the first side leveling body 19a' rotates together with the first side leveling body 19a', the rotation regulating part 94 cannot come into contact with it. In other words, the third regulating mechanism 90 forms a rotation-permitted state. Therefore, when the side working body 3 is in the unfolded state, the first side leveling body 19a' can rotate up and down without being restricted, and the leveling body can level the work surface.

[0056] FIG. 20(A) shows the side working body 3 in the middle of rotating, and the operating part 97 starts / finishes contact with the operating pin 82a. At this time, the third restriction mechanism 90 forms a rotation prevention state. In this case, the operating part 97 contacts the operating pin 82a and is simultaneously pushed by the operating pin 82a to start rotating. At this time, the rotation fulcrum 93a (shown in FIG. 20) of the stopper arm 93 is located between the rotation prevention part 94 and the operating part 97. The operating part 97 is a rod-shaped member, and its tip is located below the operating pin 82a in the process of moving from the stored state to the deployed state. During the transition to the completely deployed state, when viewed from the operating part 97 as a reference, the operating pin 82a moves so as to ride up above the operating part 97. As a result, the operating part 97 is pressed by the operating pin 82a (FIG. 20(B)), the rotation prevention state by the third restriction mechanism 90 is released, and the rotation prevention part 94 can be moved up and down.

[0057] When the side working body 3 starts to rotate so as to transition from the unfolded state to the stored state, the operating unit 97 located on the side working body 3 moves relatively away from the operating pin 82a. That is, the operating unit 97 is located on the side of the side working body 3 and rotates by the folding fulcrum part 10. The operating pin 82a is fixedly disposed on the side of the central working body 2. For this reason, as shown in Figures 21(A) to (C), when the side working body 3 rotates about the folding fulcrum part 10 as a fulcrum to store or unfold it, the operating unit 97 rotates relatively to the operating pin 82a.

[0058] When the pressure from the operating pin 82a is released and the operating part 97 is biased by the elastic body, the operating part 97 transitions from the rotation permitted state to the rotation prevented state. As the side working body 3 transitions to the stored state, it is turned upside down (FIG. 23).

[0059] This point, i.e., the transition from the rotation permitted state to the rotation prevented state, will be explained with reference to Figure 22. Figure 22(A) shows the rotation permitted state. In this case, the side working body 3 is in an unfolded state, and the stopper arm 93 and the operation pin 82a are close to each other. In other words, the operation part 97 is pushed downward by the operation pin 82a, and the rotation restricting part 94 has rotated upward. At this time, since the rotation restricting part 94 is located above the protruding part 91, there is no interference even if the protruding part 91 moves due to the rotation of the first leveling body 19a', and the first leveling body 19a can freely rotate up and down. Fig. 22(B) shows the end point of the rotation permitted state. In this case, when the side working body 3 starts to rotate from the unfolded state to the stored state, the stopper arm 93 and the operating pin 82a move slightly away from the state shown in Fig. 22(A). However, the rotation restricting part 94 is biased downward by the elastic body 95, so the operating part 97 is biased upward. Therefore, the operating part 97 and the operating pin 82a maintain a contact state. At this time, the rotation restricting part 94 is at the limit point located above the protruding part 91, and is at the limit position where the first leveling body 19a' of the side working body 3, which rotates around the folding fulcrum, can rotate up and down. Fig. 22(C) shows the rotation-blocked state. In this case, the stopper arm 93 and the operation pin 82a are further apart from the state shown in Fig. 22(B). The rotation-blocking portion 94 is biased by the elastic body 95 so as to move downwardly below the protrusion 91, so that the rotation-blocking portion 94 moves downwardly from the top of the protrusion 91, that is, to a position where they overlap when viewed from behind. In other words, the rotation-blocked state is formed. At the same time, the operation portion 97 is also biased upwardly, so that the operation portion 97 and the operation pin 82a maintain a contact state. This position is the final point where the operation portion 97 and the operation pin 82a can come into contact with each other. Fig. 22(D) shows a further rotation-blocked state. The stopper arm 93 and the operating pin 82a are further apart from the state shown in Fig. 22(C). Because the rotation-blocking portion 94 is lowered all the way downward by the elastic body 95, the stopper arm 93 is in the same state as shown in Fig. 22(C) relative to the first side leveling body 19a', maintaining its positional relationship and maintaining the rotation-blocked state. The operating portion 97 is also in the same state as shown in Fig. 22(C) relative to the side working body 3, with no change. Therefore, the distance between the stopper arm 93 and the operating pin 82a is further increased, and the contact between the operating portion 97 and the operating pin 82a is released.

[0060] As it shifts to the stored state, the side working body 3 is turned upside down (Fig. 7, Fig. 21(c)). At this time, the ground leveling body 19' of the side working body 3 tries to rotate in the direction of gravity, but the stopper arm 93 in the rotation prevention state has the protruding part 91 in contact with the rotation restriction part 94, so the rotation of the ground leveling body 19' is prevented (Fig. 24). Therefore, even if the side working body 3 is turned upside down, the positional relationship between the ground leveling body 19' and the side working body 3 is maintained, and the ground leveling body 19' does not become rotatable, so the ground leveling body 19' does not move unexpectedly during travel.

[0061] Conversely, when the side working body 3 starts to rotate so as to move from the stored state to the deployed state, the operating part 97 moves relatively to the operating pin 82a so as to gradually approach the operating pin 82a. As the deployed state is formed, the operating part 97 starts to be pressed by the operating pin 82a, and the stopper arm 93 moves from the rotation-preventing state to the rotation-permitting state. When the side working body 3 is in the rotation-permitting state and forms the deployed state, the rotation restricting part 94 moves out of the range of the rotation radius r (shown in Figs. 23 and 24) of the protruding part 91, so that the rotation of the ground leveling body 19' is permitted. Therefore, the ground leveling body 19' becomes rotatable, and the work surface can be leveled (Figs. 21 to 22). That is, when the side working body 3 is further rotated in the storage direction from Fig. 22(D), it becomes the state shown in Fig. 21(B). When the side working body 3 is further rotated in the storage direction, the side working body 3 rotating about the folding fulcrum 10 eventually turns over and is positioned above the central working body 2 (FIG. 21(C)). At this time, the side working body 3 is in the stored state, and the ground leveling body 19' tries to rotate by its own weight, but the rotation is prevented by the rotation restricting part 94. Therefore, it does not hang down from the cover body 32.

[0062] Figures 21(B) and 22(D) show the side working body 3 in the middle of being rotated in the deployment direction from Figure 21(A). At this time, the leveling body 19' of the side working body 3 is in a rotation-prevented state by the rotation restricting part 94.

[0063] 22(C), when the side working body 3 is further rotated toward the unfolding side, the operating part 97 and the operating pin 82a start to come into contact with each other. Since the rotation restricting part 94 overlaps with the protruding part 91 in a rear view, the rotation is prevented.

[0064] As shown in Fig. 22(D), when the side working body 3 further rotates toward the unfolded state, the operating pin 82a and the operating part 97 move relatively toward each other. As a result, the operating pin 82a presses the operating part 97, causing the rotation restricting part 94 of the stopper arm 93 to rotate in a direction that lifts it upward (Fig. 22(A)). While the side working body 3 rotates, the operating part 97 and the operating pin 82a maintain contact with each other, and when the rotation restricting part 94 is positioned above the protruding part 91, the state switches from the rotation-blocked state to the rotation-permitted state, and the first side leveling body 19a' becomes freely rotatable up and down.

[0065] 22(A), when the side working body 3 is in the unfolded state, the stopper arm 93 and the operating pin 82a come even closer to each other, and the rotation restricting part 94 is positioned further above the protruding part 91. The rotation permitted state is maintained, and even if the protruding part 91 moves due to the rotation of the first leveling body 19a', there is no interference, and the first side leveling body 19a' can freely rotate up and down.

[0066] Fig. 23 shows the rotation permitted state, that is, the case where the side working body 3 forms the deployed state. In Fig. 23, the two-dot chain line indicates the state where the ground leveling body 19' is lowered downward, and the ground leveling body 19' can rotate from the solid line to the two-dot chain line position. As shown by the two-dot chain line, the protruding part 91 and the rotation restricting part 94 of the side first ground leveling body 19a' move to a position outside the range of the rotation radius r of the protruding part 91, so the protruding part 91 does not prevent the rotation of the side first ground leveling body 19a'. Therefore, the first ground leveling body 19a' can freely rotate up and down.

[0067] 24 shows a state in which the rotation restricting portion 94 is positioned within the rotation radius r of the protruding portion 91. In this state, even if the protruding portion 91 tries to rotate together with the side first leveling body 19a', the rotation restricting portion 94 is positioned in the rotation direction of the protruding portion 91, so the movement of the first leveling body 19a is restricted.

[0068] Since the third regulating mechanism 90 is disposed adjacent to the second regulating mechanism 80 so as to be attached to it, it is possible to use a member for supporting the stopper arm 93 as a member of the second regulating mechanism 80. Therefore, it is possible to reduce the number of members constituting the third regulating mechanism 90 and the second regulating mechanism 80, thereby reducing the weight of the agricultural work machine 1 itself, and the ground contact balance of the traveling body to which the agricultural work machine 1 is attached is not deteriorated.

[0069] <Effects of the first regulatory mechanism> The effect of the first restricting mechanism 70 is to stabilize the deployed state of the side working body 3. That is, the first engaging portion 71 and the first receiving portion 73 prevent the side working body 3 from moving downward, and the hook member 75 of the fixing member 74 engages with the first engaging pin 72 to prevent upward rotation, thereby stabilizing the deployed state.

[0070] In the case of the above embodiment, the rotation axis of hook member 75 is provided parallel to the axial direction of folding fulcrum portion 10. Therefore, the rotational movement of third link 6, which rotates on an axis parallel to the axial direction of folding fulcrum portion 10, can be transmitted only by connecting rod 11, and can be transmitted to hook member 75 with a simple configuration without a complex configuration.

[0071] Furthermore, by providing the first engagement pin 72 in parallel with the axial direction of the folding fulcrum 10, it is possible to minimize fluctuations in the positional relationship between the fixing member 74 and the first engagement pin 72 when the side working body 3 is connected and fixed during unfolding work, and it is possible to prevent the side working body 3 from attempting to rotate slightly upward around the folding fulcrum 10. This makes it possible to stably maintain the unfolded state of the side working body 3.

[0072] The first receiving portion 73 prevents the side working body 3 from rotating downward around the folding fulcrum portion 10. In this embodiment, the abutting state of the first receiving portion 73 and the first engagement pin 72 corresponds to the unfolded state of the side working body 3. Note that in the unfolded state, adjusting the angle of the side working body 3 relative to the central working body 2 can be achieved by adjusting the abutting position, and in this embodiment, this is achieved by adjusting the position of the first engagement portion 71 protruding from the central working body 2.

[0073] The first engagement portion 71 is disposed above the cover bodies 28, 32 at a position furthest away in the direction of the rotation radius D (shown in FIG. 7) of the side working body 3 that rotates around the folding fulcrum portion 10. Therefore, the fixing member 74 and the first engagement pin 72 can be installed on the cover bodies 28, 32 without excessively increasing the member strength. In other words, the dimensional relationship of the first engagement portion 71 with respect to the cover bodies 28, 32 is not excessively large, and the appearance can be neat.

[0074] As described above, according to this embodiment, the first regulating mechanism 70, the second regulating mechanism 80, and the third regulating mechanism 90 make it possible to simplify the structure for regulating the movement of the side working body 3 while effectively ensuring strength.

[0075] Specifically, the second regulating mechanism 80 allows the side working body 3 to receive the force from the working surface together with the first regulating mechanism 70 and the folding fulcrum 10, and thus the force can be dispersed and received. This allows the side working body 3 to work in a more stable position relative to the central working body 2, that is, in a position in which it is held integrally in the unfolded state. When the position of the side working body 3 is in a state in which it cannot withstand the force received from the working surface, for example, when the side working body 3 is deformed or the positional relationship cannot be maintained integrally with the central working body 2 and the positional relationship is disturbed, this prevents the ground leveling body 19' of the side working body 3 from being unable to rotate appropriately, resulting in an inability to level the ground.

[0076] Furthermore, the third restricting mechanism 90 allows the first side leveling body 19a' to be fixed integrally with the side working body 3 even when the side working body 3 is moved in the stored state. In this case, it is possible to avoid unexpected rotation of the leveling body 19', and therefore it is possible to prevent the first side leveling body 19a' from colliding with other members and being damaged. In other words, it is possible to improve the durability of the first side leveling body 19a'. Furthermore, since the first side leveling body 19a' is not rotated in the stored state, it will not move even if a worker or the like inadvertently comes into contact with it, which improves reliability in terms of safety as well.

[0077] The present invention is not limited to the above embodiment. For example, the hook member 75 of the first restriction mechanism 70 is formed in a triangular shape in the illustrated example, but the shape of the hook member 75 is not important as long as a hook hole 76a is formed at the tip. In addition, the protruding portion of the third restriction mechanism 90 is not limited to a triangular pyramid shape, and may be, for example, a quadrangular pyramid shape or a columnar shape of any cross-sectional shape.

[0078] The operating portion 97 may be provided so as to be able to come into pressure contact with the operating pin 82a.

[0079] The engagement relationship between the second restriction mechanism 80 and the third restriction mechanism 90 may be opposite to that in the illustrated example. That is, the third engagement pin 96 may be provided in the second restriction mechanism 80, and the second receiving portion 83 with which the third engagement pin 96 engages may be provided in the third restriction mechanism 90.

[0080] The contact relationship between the operation portion 97 and the operation pin 82a may be opposite to that in the above embodiment, in that the operation pin 82a slides on the lower surface of the operation portion 97. [Industrial Applicability]

[0081] The present invention can be used for plowing and tilling work in paddy fields. [Explanation of symbols]

[0082] 1 Agricultural machinery 2 Central work unit 2a Central support frame 2b Connection side end 21 Pipe Frame 21a Folding end 22 Gear shifting section 23 Topmast 24 Top Pin 25 Input shaft 26 Second pipe frame 27 Lower Pin 28 Cover body 3 Side work body 3a Side support frame 31 Pipe Frame 31a Folding end 32 Cover body 4 First link 4a Main body 4b Slope 4c Rotation hole 4d rotation hole 41 1st long hole 41a 1st position 41b 2nd position 42 Pivot Point 5. Second Link 5a Rotation hole 5b Rotation hole 51 Pivot point 6. Third Link 61 Connecting part 62 Link section 62a Rotation hole 63 2nd long hole 63a 3rd position 63b 4th position 64 Pivot Point 65 Connection hole 7 Link mechanism 8 Connecting pin 9 Cylinders 9a Fulcrum part 9b Cylinder fulcrum 9c Cylinder rod 9d Directional control valve 10 Folding fulcrum 10a pin 11 Connecting rod 11a Tip 18 Cultivation Department 18a Rotor shaft 18b Claws 19 Land leveling structure 19a First Leveling Body 19b Second Leveling Body 19´ Land leveling structure 19a´ 1st leveling body 19b´ 2nd leveling body 20a chain case 20b chain case 70 First Regulatory Mechanism 70A male part 70B Female part 71 First engagement part 72 First engagement pin 73 First Receiving Section 74 Fixing member 75 Hook member 76 Rock Club 76a Hook hole 77 Spring 80 Second Regulatory Mechanism 81 Second engagement portion 82 Second engagement pin 82a Operation pin 83 Second Receiving Section 84 Support member 85 Reinforcement member 90 Third Regulatory Mechanism 91 Protrusion 92 Third engagement part 93 Stopper arm 93a Stopper arm rotation fulcrum 93b Stopper arm rotation shaft 94 Rotation control part 95 Elastic Body 96 Third engagement pin 97 Control section P plumb line q Folding fulcrum axis D Turning radius of first receiving part d Rotation radius of the second engagement part r Radius of rotation of protrusion

Claims

1. A farm machine including a central working body provided with a folding fulcrum portion, and a side working body provided so as to be rotatable relative to the central working body by the folding fulcrum portion, a pair of rotation restriction mechanisms for restricting rotation of the side working body are provided on one side of the folding fulcrum portion; the set of rotation restriction mechanisms includes one restriction mechanism and another restriction mechanism, the one restriction mechanism being provided on the central working body and the other restriction mechanism being provided on the side working body, the one restriction mechanism and the other restriction mechanism have an engaging protrusion on one side and an engaging recess on the other side, and have a detachable engaging relationship with each other; an operating portion that is abutted by an operating pin provided on the one restriction mechanism is provided on the other restriction mechanism; the other restriction mechanism includes a rotatable stopper arm on which the operation portion is provided and a rotation restriction portion provided at one end of the stopper arm, When the engaging protrusion is in a deployed state where it is engaged with the engaging recess, a rotation permitted state is formed, The agricultural machine is characterized in that a rotation-preventing state is formed during rotation between the deployed state and the stored state, in which the engaging projection is not engaged with the engaging recess.

2. In the agricultural work machine according to claim 1, another regulating mechanism is provided on the other side of the folding fulcrum portion, the another regulating mechanism being composed of a male part and a female part, the male part being provided on one of the central working body or the side working body, and the female part being provided on the other, said male part being a protrusion having another engagement pin, and said female part being a fixing member having an engagement hole into which said other engagement pin can be detachably fitted, and a rotatable hook member provided with a locking part that covers and engages with said other engagement pin.

3. 3. An agricultural work machine according to claim 1, wherein the other regulating mechanism is provided with an elastic body for biasing the stopper arm so as to rotate it vertically.

4. 3. The agricultural work machine according to claim 1, wherein when the operating portion is pressed by the operating pin and the rotation restricting portion is positioned above the protrusion, a rotation permitted state is formed in which the ground leveling body rotates up and down.

5. 3. An agricultural work machine according to claim 1, wherein the rotation permitted state ends when the operating portion is pressed by the operating pin to a contact limit point between the rotation restricting portion and the protruding portion.

6. 3. An agricultural working machine according to claim 1 or 2, characterized in that when the operating part is pressed by the operating pin and the rotation regulating part is positioned below the top of the protrusion, a rotation prevention state is formed in which the leveling body cannot rotate up and down.

7. 2. The agricultural machine according to claim 1, wherein the first regulating mechanism and the second regulating mechanism are provided on a rear side of the cover body in the traveling direction of the machine body.

8. 3. An agricultural machine according to claim 2, wherein the separate regulating mechanism is provided on the front side of the cover body in the traveling direction of the machine body.

Images