JP4790738B2 - Folding farm work machine - Google Patents

Description

  The present invention relates to a folding farm work machine in which an extension work machine body is provided for a work machine body connected to a rear portion of a tractor so as to be movable up and down, and the extension work machine body is foldable with respect to the work machine body.

  As this type of folding farm work machine, a rotary work machine that performs tillage, leveling, or scraping work is known. In this rotary work machine, the work machine body at the center of the work width is connected to the rear part of the tractor via a connecting device that can be raised and lowered, and the extension work machine body that extends the work width is folded on both the left and right sides of the work machine body. It is deployed as possible.

  Here, the rotary working part of the work machine body is rotated by the power from the tractor, and the extended rotary working part of the extension work machine body connects the rotary shaft end part of the rotary work part to the rotary shaft end part of the extension rotary work part. It is rotationally driven by doing. Therefore, this folding rotary work machine can perform a narrow work by using the work machine body alone with the extended work machine body on the left and right sides folded with respect to the work machine body at the center. It is also possible to work in a state in which one or both of the left and right extension work machines are horizontally deployed and the work width is extended.

  In such a rotary work machine, a leveling member for leveling the mud ground crushed by the rotary work part is pivotally supported on the work machine body and the extension work machine so as to be vertically movable at the rear lower part of the machine body. This leveling member needs to separate each leveling member in a state where the extension work machine body is folded with respect to the work machine body, and in a state where the extension work machine body is deployed horizontally with respect to the work machine body, It is necessary to connect each leveling member so that each leveling member moves up and down integrally.

  As a connecting means of the leveling member in such a folding farm work machine, a fitting convex part is provided on one of the facing side parts of each leveling member on the work machine main body side or the extension work machine side, and the other side part facing the working machine body side or extension work machine side. When the extension working machine body is horizontally deployed with respect to the work machine body by providing the fitting concave part, the fitting convex part of one leveling member is fitted to the fitting concave part of the other leveling member, and both leveling What connects a member is known (refer to patent documents 1).

JP 2000-34001 A

  According to the connecting means of the leveling member in such a folding farm work machine, the fitting recess is provided on one of the side of the work machine main body or the extension work machine body, so that the fitting exposed when working in the folded state There is a problem in that soil or the like enters the recess and closes the recess, making it impossible to smoothly connect the leveling members.

  In addition, when the leveling member on the work machine main body side and the leveling member on the extended work machine side are connected by uneven fitting, a gap is generated between the side portions of both leveling members unless the mechanical assembly accuracy is considerably increased. There was a problem that the mud ground crushed by the rotary working part flowed out from this gap and the necessary leveling function could not be achieved. Furthermore, when high assembly accuracy is required, there is a problem that the structure is complicated and the cost is increased and high productivity cannot be obtained.

  An object of the present invention is to cope with such a problem. Specifically, when a leveling member is connected in a folding farm work machine, a reliable connection is possible, and a simple structure is provided. Then, it aims at preventing mud from flowing out between the connected leveling members.

In order to achieve such an object, the claimed invention according to the present invention has the following features.

The invention according to claim 1 is connected to the rear portion of the tractor so as to be movable up and down, and has a working machine body including a rotary working unit driven by power from the tractor, and extends the working width with respect to the working machine body. It is possible to select a state in which the extension work machine body is horizontally deployed with respect to the work machine body and a state in which the extension work machine body is folded with respect to the work machine body. In the folding agricultural machine
The working machine main body and the extension work machine body include a first leveling member that is pivotally supported at the lower rear portion of the machine body so as to be movable up and down, and a second leveling member that is pivotally supported below the first leveling member. The leveling member is provided with connecting means for connecting the second leveling members in the expanded state,
The connecting means includes a first cooperating body that cooperates with the second leveling member on the extended work machine side as the second leveling member on the work machine body side rises, and a second leveling member on the work machine body side. A second cooperating body that cooperates with the second leveling member on the extension work machine body side as it descends,
The first and second cooperating bodies are each composed of a pair of projecting members projecting from opposite sides of the both second leveling members,
The tip of the one projecting member which definitive said first co body contacts the guide plate of the other of the projecting member side while the expansion, the two second leveling member becomes the same height receive a grounding resistor The one projecting member once retracted by the guide plate projects onto the contact surface of the other projecting member.

The invention according to claim 2 is the folding agricultural work machine according to claim 1, wherein the one projecting member is a member that is supported so as to project and retract toward the other facing the other, and the other is supported by the member. It has the contact surface which contact | abuts, It is characterized by the above-mentioned.

The invention according to claim 3 is the folding agricultural work machine according to claim 1 or 2, wherein the projecting member on the work machine main body side of the first cooperative body is overlapped under the projecting member on the extension work machine side. The projecting member on the work machine main body side of the second cooperative body is overlaid on the projecting member on the extension work machine body side.

The invention according to claim 4, in the folded agricultural machine according to any of claims 1 to 3, before Symbol second cooperating element is plate-like formed along the side of the second ground leveling member It consists of a protruding member.

  The operation of the invention according to each claim is as follows.

  That is, the folding farm work machine is connected to the rear part of the tractor so as to be movable up and down, and has a work machine body provided with a rotary work part that is driven by power from the tractor, and extends the work width with respect to the work machine body. It is possible to select a state in which the extension work machine body is horizontally deployed with respect to the work machine body and a state in which the extension work machine body is folded with respect to the work machine body. It is possible to perform narrow work by using the work machine body alone with the extension work machine body on the left and right sides folded with respect to the work machine body in the center part. It is also possible to work in a state where one or both are installed in an extended state and the work width is extended.

  In addition, the work machine body and the extension work machine body are provided with leveling members that are pivotally supported at the rear lower part of the machine body so as to be movable up and down, and each leveling member includes both the leveling members in a state where the work machine body and the extension work machine body are deployed. Since the connecting means for connecting the two leveling members is connected, the leveling members can be connected and moved up and down integrally during deployment, and uniform leveling can be performed within the extended work width. When the extension work machine body is folded with respect to the main body, each leveling member can be separated.

  The connecting means for connecting the leveling members pivotally supported by the work machine main body and the extension work machine body respectively works with the first cooperating body that cooperates with both leveling members as the leveling member on the work machine main body side rises. Since the ground leveling member on the machine body side is composed of a second cooperating body that cooperates with both leveling members, there is no need to provide a fitting recess in each leveling member, Therefore, the two leveling members can be reliably connected.

  Furthermore, according to the folding farm work machine of the present invention, the first cooperative body and the second cooperative body in the above-mentioned connecting means are each composed of a pair of projecting members projecting from the opposing side portions of the two leveling members, The projecting member on the work machine body side is overlaid under the projecting member on the extension work machine body side, and in the second cooperative body, the projecting member on the work machine body side is overlaid on the projecting member on the extension work machine body side.

  Therefore, when the leveling member on the work implement main body side rises in a state where the extension work implement is horizontally deployed with respect to the work implement main body, the projecting member protruding from the side of the leveling member becomes the side of the leveling member on the extension work implement side. When the leveling member on the work machine main body side is lowered, the protruding member protruding from the side of the leveling member on the work machine main body side becomes the side of the leveling member on the extension work machine side. The protruding member protruding from the portion is pushed down. As a result, the leveling member pivotally supported by the work machine main body and the leveling member pivotally supported by the extension work machine body can be integrally moved up and down during deployment.

  In addition, since the projecting member projecting from the leveling member on the work machine main body side and the projecting member projecting from the leveling member on the extension work machine side are not combined at all, when folding the extension work machine body on the work machine main body Both the leveling members can be separated without particularly performing the releasing operation. This makes it possible to simplify the apparatus.

  Furthermore, according to the folding agricultural work machine of the present invention, one of the pair of projecting members described above is a member that is supported so as to project and retract toward the other facing the other, and the other has a contact surface that contacts the member. Have. According to this, even if the extension work machine body is deployed horizontally with respect to the work machine body, the projecting member that has been held can be retracted against elasticity if necessary for maintenance or the like. The leveling member on the work machine body side and the leveling member on the extension work machine side can be made independent.

  Also, when the tip of one projecting member abuts the guide plate on the side surface of the other projecting member with the working machine main body and the extension working machine body unfolded, and the two leveling members receive ground resistance and become the same height In addition, since the one protruding member once retracted by the guide plate protrudes on the contact surface of the other protruding member, the two leveling members can be connected without particularly operating the leveling member. .

  Furthermore, according to the folding agricultural work machine of the present invention, the first or second cooperative body described above can be a plate-like protruding member formed along the side of the leveling member. According to this, at the time of deployment, since the plate-like projecting member formed along the side of the leveling member overlaps between the leveling member on the work machine body side and the leveling member on the extension work machine side, both leveling It becomes possible to close the gaps between the side portions between the members with the plate-like projecting members, and it is possible to prevent the mud from flowing out from the gaps between the two leveling members with a simple structure.

  The connecting means between the leveling members includes a first leveling member (apron) that is pivotally supported by the machine body as a leveling member and a second leveling member (level plate) that is pivotally supported below the first leveling member. In such a case, each leveling member can be provided mutually.

  Since this invention is comprised in this way, when connecting the leveling member in a folding agricultural work machine, a reliable connection is possible, and also it prevents the mud from flowing out between the leveling members connected with a simple structure. can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG.1 and FIG.2 is an external view of the rotary working machine which is a folding agricultural working machine. The rotary work machine 1 is a rotary halo that has a long work width in the left-right direction and can perform wide crushed soil or scraping work in one stroke. A connecting portion 2 connected to a three-point link hitch mechanism comprising a top link and a lower link of a tractor (not shown) is provided at a front central portion of the rotary work machine 1. It is connected by the connection part 2 so that raising / lowering is possible. In addition, power is transmitted from the PTO shaft of the tractor to the gear box 3 through transmission means such as a universal joint.

  The rotary work machine 1 includes a work machine body 4 at a central portion having a work width slightly wider than a tractor tire interval, and an extended work machine body 5L provided to extend the work width to the left and right of the work machine body 4. 5R, and has a structure that is divided into three by the work machine body 4 and the extension work machines 5L and 5R.

  The extension work machines 5L and 5R are connected to each other by a rotation support portion 6 and 6 provided on the fixed cover member 15 of the work machine body 4 so as to be rotatable by about 180 °. As shown in FIG. The folded state can be maintained by overlapping the back surface of the main body 4 and the back surfaces of the extension work machines 5L and 5R provided on the left and right. In addition, when extending the working width, one or both of the extension work machines 5L and 5R can be held horizontally with respect to the work machine body 4 so that the above-described folded state and unfolded state can be maintained. And can be selected.

  Here, the work implement body 4 has a work width wider than the tire interval of the tractor as described above, so that the wheel marks attached to the field by the tire of the tractor can be erased. In addition, the extension work machine bodies 5L and 5R are set to be less than or equal to half the length of the work machine body 4 so that both the left and right sides can be folded.

  The above-described fixed cover members 15 and 15a are provided on the upper portions of the work machine body 4 and the extension work machine bodies 5L and 5R, respectively, and then the leveling plates (first leveling members) 16 and 16a are respectively provided at the lower ends. The upper end part of is pivotally attached via a pivot shaft 16b. Further, the base ends of leveling plates (second leveling members) 17 and 17a are pivotally supported by the pivot shaft 17b at the rear ends of the leveling plates 16 and 16a.

  Here, the flat plate 17 in the work machine body 4 is supported at the center in the width direction via the flat plate control body 18, and the flat plate 17 can be freely rotated by the pivot shaft 17b. And the fixed state in which the rotation of the flat plate 17 is regulated on the lower side and the soiling of the scraped soil is carried out, and this selection is made so that the tractor operator can operate in the driving state. Yes.

  Further, leveling plate connecting means 19 are provided on both sides of the leveling plate 16 in the work machine main body 4 and the leveling plates 16a and 16a in the extension work machines 5L and 5R. Flat plate connecting means 20 is provided on both sides of the flat plates 17a and 17a in the work machine bodies 5L and 5R. Reference numerals 193 and 201 in FIG. 2 indicate projecting members in the leveling plate connecting means 19 and the leveling plate connecting means 20, respectively.

  On the left and right sides of the gear box 3, a main body frame 7 for supporting the work machine main body 4 is extended. In this working machine body 4, a transmission case 8 is suspended from one end side of the main body frame 7, and a support frame 9 is suspended from the other end side. A rotary working unit is provided between the transmission case 8 and the support frame 9. 10 is mounted on the shaft. Further, in the extension work machine bodies 5L and 5R, an extension rotary work part 13 (13A indicates an extension rotary shaft and 13B indicates a rotary claw) is provided between the shaft support parts 14 and 14. Reference numeral 11 denotes a connection part exposed on the side surface of the transmission case 8 (projection piece 11A, cylindrical body 21), and 12 denotes a connection part exposed to the outside of the shaft support part.

  FIG. 3 is an explanatory diagram for explaining the drive unit of the rotary working machine described above. The same parts as those described above are denoted by the same reference numerals. The gear box 3 protrudes from an input shaft 3A to which power from the PTO shaft of the tractor is input via a transmission means such as a universal joint. The power input to the input shaft 3A is transmitted to the gear transmission mechanisms 3B and 3C. The transmission shaft 7A, the sprocket 8A in the transmission case 8 and the chain 8B are transmitted to the rotary shaft 10A.

  The rotary shaft 10 </ b> A has a plurality of rotary claws 10 </ b> B projecting from its peripheral surface, and both ends thereof are pivotally supported by the shaft support portions 4 </ b> A and 4 </ b> A of the work machine body 4 to form the rotary work portion 10. The extended rotary shaft 13A has a plurality of rotary claws 10B projecting from its peripheral surface, and both ends thereof are pivotally supported by the shaft support portions 14 of the extension work machine bodies 5L and 5R to form the extended rotary work portion 13. Yes.

  And the connection part 11 is exposed to the outer side from the side surface of the working machine main body 4 in the both ends of 10 A of rotary shafts. Further, the connected portion 12 connected to the connecting portion 11 (projecting piece 11A, cylindrical body 21) is exposed from the side surface of the extension work machine body 5L, 5R, and is provided at one end portion of the extension rotary shaft 13A. Yes. Accordingly, when the extension work machine bodies 5L and 5R are expanded horizontally with respect to the work machine body 4, the connection part 11 at the end of the rotary shaft 10A and the connected part 12 at the end of the extension rotary shaft 13A are connected, Power is transmitted to the extended rotary shaft 13A via the rotary shaft 10A. Further, in a state where the rotary shaft 10A and the extended rotary shaft 13A are detached and the extension work machine bodies 5L and 5R are folded with respect to the work machine body 4, the rotary shaft 10A is driven alone.

  Hereinafter, the leveling plate connecting means 19 and the leveling plate connecting means 20 will be described in detail with reference to FIGS. FIG. 4 is a plan view showing a connecting portion between the leveling plates 16 and 16a and the leveling plates 17 and 17a. 5 is a partial cross-sectional view taken along line AA in FIG. 4, and FIG. 6 is a side view taken along line BB. The same parts as those in the above-mentioned drawings are denoted by the same reference numerals, and a part of the description is omitted.

  The leveling plate connecting means 19 includes a first cooperative body and a second cooperative body. The ground leveling plate connecting means 19 includes a projecting member 191 projecting from the upper side of the leveling plate 16 on the work machine main body side, and the leveling plate 16a side on the extended work machine side. A first cooperative body is formed by the projecting pins 192 projecting from the upper part of the section, and a plate-shaped projecting member 193 serving as a projecting member projecting from the lower side of the leveling plate 16 on the work machine body side, and a leveling plate 16a on the extended work machine side. A second cooperating body is formed by a plate-like projecting member 194 serving as a projecting member projecting from the lower side of the side portion.

  Similarly, the flat plate connecting means 20 is also composed of a first cooperative body and a second cooperative body, and a contact member 201A formed on the upper portion of the protruding member 201 protruding from the side portion of the flat plate 17 on the work machine main body side. The first cooperating body is formed by the projecting pin 202 projecting from the upper side of the leveling plate 17a on the extension work machine side, and is in contact with the lower part of the projecting member 201 projecting from the leveling plate 17 on the work machine body side. A second cooperative body is formed by the member 201B and a plate-like projecting member 203 that serves as a projecting member projecting from the lower side of the flat plate 17a on the extension work machine side (see FIG. 6).

  The projecting pin 192 is supported by the side portion and the support portion 192A of the leveling plate 16a on the extension work machine side, and is urged by the spring 192B toward the main body work machine side so that it can project and retract. Further, an auxiliary support pin 192C is formed on the projecting pin 192 in a bifurcated manner and is supported by a hole on the side of the leveling plate 16a. On the other hand, the projecting pin 202 in the flat plate 17a is supported by the support frame 202A and is urged by the spring 202B toward the main body work machine side so that it can project and retract.

  According to the leveling plate connecting means 19 having such a structure, the extension work machine bodies 5L and 5R are horizontally deployed with respect to the work machine body 4, and the state shown in FIGS. The projecting pin 192 projects from the side portion 16a and overlaps with the projecting member 191 projecting from the side surface of the leveling plate 16 on the main body side of the work machine, and comes into contact with the side portion of the leveling plate 16, whereby the first cooperative body functions. It becomes a state. Further, the plate-like projecting member 193 projecting below the side portion of the leveling plate 16 on the work machine main body side overlaps the plate-like projecting member 194 projecting below the side portion of the leveling plate 16a on the extension work machine side. Thus, the second cooperative body will function.

  That is, in this state, when the leveling plate 16 on the work machine main body side is raised, the protruding member 191 comes into contact with the protruding pin 192 and pushes up, so that the leveling plate 16a on the extended work machine side is raised together. When the leveling plate 16 on the work machine body side is lowered, the plate-like projecting member 193 on the work machine body side comes into contact with and pushes down the plate-like projecting member 194 on the extension work machine body side. Thus, the leveling plate 16a on the extension work machine side is moved down together. Therefore, in a state where the first and second cooperative bodies are functioning, the leveling plates 16 and 16a move up and down integrally.

  Similarly, according to the leveling plate connecting means 20, the extension work machine bodies 5L and 5R are horizontally deployed with respect to the work machine body 4, and the state shown in FIGS. 4 and 6 is obtained, and the leveling plate 17a side on the extension work machine side is obtained. The protruding pin 202 protrudes from the portion and overlaps on the abutting member 201A of the protruding member 201 protruding from the leveling plate 17 side portion on the work machine main body side, and the first cooperative body becomes functional. Further, the contact member 201B below the projecting member 201 projecting to the side of the leveling plate 17 on the work machine main body side is above the plate-shaped projecting member 203 projecting to the lower side of the leveling plate 17a on the extension work machine side. It will be in the state which overlaps with, and a 2nd cooperative body will function.

  That is, in this state, when the leveling plate 17 on the work machine body side is raised, the contact member 201A comes into contact with the protruding pin 202 and pushes up, so that the leveling plate 17a on the extension work machine side is raised together. When the leveling plate 17 on the work machine body side is lowered, the contact member 201B on the work machine body side comes into contact with the plate-like projecting member 203 on the extension work machine body side and pushes down. Thus, the leveling plate 17a on the extension work machine side is moved down together. Therefore, in a state where the first and second cooperative bodies are functioning, the leveling plates 17 and 17a move up and down integrally.

  According to the rotary working machine 1 of such an embodiment, as shown in FIG. 1, the usage mode in which the left and right extension working machines 5L and 5R are horizontally deployed with respect to the working machine body 4 to work with a wide working width, As shown in FIG. 2, the left and right extension work machines 5L and 5R are folded with respect to the work machine body 4, and the working mode is such that only the work machine body 4 is used. It is possible to select each usage pattern of the usage pattern in which the working width of only one of the left and right sides is widened while one of the airframes 5L and 5R is folded. Further, when traveling on the road or being stored in the warehouse, the working machine body 4 is lifted up to the non-working position, and the left and right extension work machines 5L and 5R are folded with respect to the working machine body 4 in this state. It can also be.

  When the extension work machine bodies 5L and 5R are folded from the work machine main body 4 to the horizontal unfolded state, the projecting pins 192 are in a projecting state, and the state shown in FIG. And the 2nd cooperation body functions and the leveling boards 16 and 16a will be in the state integrated.

  On the other hand, since the flat plate 17a on the extension work machine side hangs down by its own weight and is in the lowermost state, the flat plate 17, 17a is in the lowermost state until the flat plate 17, 17a receives the grounding resistance in the unfolded state. Thus, the leveling plate 17a on the extended work machine side is positioned below the leveling plate 17 on the working machine body side. In this state, when the leveling plates 17 and 17a are grounded to the work surface of the farm field, the leveling plate 17a on the extension work machine side rises, and the protruding pin 202 that comes into contact with the guide plate 201C on the side surface of the protruding member 201 becomes the guide plate. When the flat plates 17 and 17a are temporarily retracted by the action of 201C and have the same height due to the grounding resistance, the contact member 201B of the protruding member 201 contacts the plate-shaped protruding member 203, and on the contact member 201A The protruding pin 202 protrudes.

  Thereby, the first and second cooperating bodies can be made to function without particularly operating the leveling plate 17, and both leveling plates 17, 17a can be connected. Even in such an unfolded state, the projecting pins 192 and 202 can project and retract, so that the leveling plates 16 and 16a and the leveling plate 17 can be retracted by retracting them toward the extension work machine against the elasticity. 17a can be independent of each other.

  Further, when the extension work machine bodies 5L and 5R are folded on the upper part of the work machine body 4, the tip of the projecting pin 192 is opened, so that the projecting pin 192 is slid by the action of the spring 192B and the auxiliary support pin 192C is not shown. The leveling plate 16a can be fixed by being supported by the support portion of the fixed cover member 15a on the extended work machine side.

  According to such an embodiment, the leveling plate connecting means 19 or the leveling plate connecting means 20 is provided with the leveling plates 16 and 16a or the leveling plates 17 and 17a as the leveling plate 16 or the leveling plate 17 on the work machine body side rises. And a second cooperating body that cooperates both the leveling plates 16 and 16a or the leveling plates 17 and 17a with the lowering of the leveling plate 16 or the leveling plate 17 on the work machine main body side. Therefore, it is not necessary to provide a fitting recess in each leveling plate 16, 16a or leveling plate 17, 17a. Since the fitting recess does not get clogged with soil during the operation, the two leveling plates 16 and 16a or the leveling plates 17 and 17a can be reliably connected.

  Further, the leveling plate 16 on the work machine main body side, the projecting member 191 projecting from the leveling plate 17, the plate-like projecting member 193, the projecting member 201, the leveling plate 16 a on the extension work machine side, and the projecting pin 192 projecting from the leveling plate 17 a Since the plate-like projecting member 194, the projecting pin 202, and the plate-like projecting member 203 are not coupled at all, when the extension work machines 5L and 5R are folded with respect to the work machine body 4, there is no particular release operation. Both the leveling plates 16, 16a or the leveling plates 17, 17a can be separated. This makes it possible to simplify the apparatus.

  Furthermore, at the time of deployment, the plate-like projecting members 193 and 194 formed along the side portions of the leveling plates 16 and 16a are overlapped between the leveling plate 16 on the working machine main body side and the leveling plate 16a on the extension work machine side. Therefore, the gap between the side portions between the two leveling plates 16 and 16a is blocked by the plate-like projecting members 193 and 194, and mud is prevented from flowing out from the gap between the two leveling plates 16 and 16a. it can.

It is an external view (at the time of expansion | deployment) of the rotary working machine which is a folding agricultural work machine of this invention. It is an external view (at the time of folding) of the rotary working machine which is a folding agricultural work machine of this invention. It is explanatory drawing explaining the drive part of the rotary working machine which is a folding agricultural work machine of this invention. It is a top view which shows the leveling member which concerns on embodiment of this invention, and the connection part of a leveling plate. FIG. 5 is a partial sectional view taken along line AA in FIG. 4. It is a BB side view in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotary work machine 2 Connection part 3 Gear box 4 Work machine main body 4A Shaft support part 5L, 5R Extension work machine body 6 Rotation support part 7 Main body frame 8 Transmission case 9 Support frame 10 Rotary work part 13 Extension rotary work part 15, 15a Fixed cover Members 16, 16a Leveling plate (first leveling member)
17, 17a Flat plate (second leveling member)
18 Leveling plate control body 19 Leveling plate connecting means 191 Protruding member (first cooperative body)
192 Protruding pin (first cooperative body)
193,194 Plate-like projecting member (second cooperative body)
20 Flat plate connecting means 201 Protruding member 201A Contact member (first cooperative body), 201B Contact member (second cooperative body)
201C Guide plate 202 Protruding pin (first cooperating body)
203 Plate-like protruding member (second cooperative body)

Claims (4)

A work machine main body having a rotary working unit that is connected to the rear part of the tractor so as to be movable up and down and is driven by power from the tractor, and an extended work machine body that is arranged to extend the work width with respect to the work machine main body In the folding agricultural work machine that can select a state in which the extension work machine body is horizontally deployed with respect to the work machine body, and a state in which the extension work machine body is folded with respect to the work machine body,
The working machine main body and the extension work machine body include a first leveling member that is pivotally supported at the lower rear portion of the machine body so as to be movable up and down, and a second leveling member that is pivotally supported below the first leveling member. The leveling member is provided with connecting means for connecting the second leveling members in the expanded state,
The connecting means includes a first cooperating body that cooperates with the second leveling member on the extended work machine side as the second leveling member on the work machine body side rises, and a second leveling member on the work machine body side. A second cooperating body that cooperates with the second leveling member on the extension work machine body side as it descends,
The first and second cooperating bodies are each composed of a pair of projecting members projecting from opposite sides of the both second leveling members,
The tip of the one projecting member which definitive said first co body contacts the guide plate of the other of the projecting member side while the expansion, the two second leveling member becomes the same height receive a grounding resistor The folding agricultural working machine is characterized in that the one projecting member once retracted by the guide plate projects on the contact surface of the other projecting member. 2. The one projecting member according to claim 1, wherein the one projecting member is a member that is supported so as to project and retract toward the opposite side, and the other has a contact surface that contacts the member. Folding agricultural machine as described. The projecting member on the work machine main body side of the first cooperative body is stacked under the projecting member on the extension work machine body side, and the projecting member on the work machine main body side of the second cooperative body is above the projecting member on the extension work machine body side. The folding agricultural machine according to claim 1 , wherein the folding agricultural machine is overlaid on the farm. Before Stories second co body, folding agricultural machine according to any of claims 1 to 3, characterized in that a plate-like protrusion member formed along the side of the second ground leveling member.

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