JP6798682B2 - Work machine - Google Patents

Description

The present invention relates to a working machine. In particular, the present invention relates to a rotary work machine which is attached to the rear part of a traveling machine and advances as the traveling machine moves forward while rotating a tilling rotor to plow a field.

Such a rotary work machine has a frame connected to the traveling machine body and an apron provided behind the frame and capable of descending and flipping up around a rotation fulcrum fixed to the frame. When scraping off the soil adhering to the front part of the apron (the side facing the tiller rotor) or the tiller rotor, or when replacing the tiller claws provided on the tiller rotor, keep the apron in a flipped state. However, the apron has a certain weight, and the work of flipping up the apron is a heavy labor for the worker.

Under these circumstances, a working machine of Patent Document 1 capable of assisting in flipping up an apron is disclosed. In particular, the working machine described in Patent Document 1 has a configuration in which the tensile gas spring extends when the apron is flipped up.

Japanese Unexamined Patent Publication No. 2010-63367

However, it is not desirable that the assist configuration including the gas spring and the like expands as the state shifts from the state before the jump to the state after the jump.

The present invention is to avoid expanding the configuration for assisting the apron to be flipped up as the work machine having the assist configuration for assisting the apron flipping up shifts from the state before the apron is flipped up to the state after the apron is flipped up. The purpose is to provide a working machine that can be used.

The working machine according to the embodiment of the present invention is attached to the rear part of the traveling machine body, and is mounted on the rear part of the traveling machine body in the working machine which advances along with the forward traveling of the traveling machine body to cultivate the field while rotating the tiller rotor. A frame to be connected, an apron provided at the rear part of the frame, supported by a descent and a flip-up rotation with respect to the frame, and leveling the field, and a first fulcrum provided on the frame and an apron provided on the apron. As the distance between the first fulcrum and the second fulcrum becomes longer, the compression force is increased to the first length, and as the distance between the first fulcrum and the second fulcrum becomes shorter, the first length becomes longer than the first length. Provided is a working machine provided with a compressive force member that exerts a force in the direction of flipping up the apron while reducing the compressive force while contracting to a short second length.

According to the working machine of the present invention, in a working machine having an assist configuration for assisting the apron flipping up, the configuration for assisting the apron flipping up is expanded as the state before the apron flipping up shifts to the state after the apron flipping up. Is avoided.

It is a rear view of the working machine which concerns on 1st Embodiment of this invention. (A) is a side view of the apron of the working machine before flipping up. (B) is a cross-sectional view of the periphery of the first fulcrum inserted into one end of the compressive force member as viewed from above. (C) is a cross-sectional view of the periphery of the second fulcrum as viewed from above. It is a side view of the work machine with the apron flipped up. (A) is a cross-sectional view of a permissible regulation mechanism when the compressive force member is stretched, and is a cross-sectional view showing a state in which a pin in the permissible regulation mechanism is inserted into the second hole and the first hole. (B) is an enlarged side view of the cam portion. It is sectional drawing of the allowable regulation mechanism when a compressive force member contracts, and is also the sectional view which shows the state which the pin in the allowable regulation mechanism is removed from the 2nd hole and 1st hole. It is a side view of the working machine at the time of tilling. It is a side view before flipping up the apron of the work machine which concerns on 2nd Embodiment. It is a side view of the work machine with the apron flipped up. It is sectional drawing which shows the state which the pin in the permissive regulation mechanism is inserted into the 1st hole and the 2nd hole. It is sectional drawing which shows the state which the pin in the permissive regulation mechanism was removed from a 1st hole and a 2nd hole. It is a side view of the working machine at the time of tilling.

Hereinafter, examples of the working machine of the present invention will be described with reference to the drawings. However, the working machine of the present invention can be implemented in many different modes, and is not construed as being limited to the contents of the examples shown below. In the drawings referred to in the present embodiment, the same parts or parts having the same functions are designated by the same reference numerals, and the repeated description thereof will be omitted. Further, for convenience of explanation, the terms front (front side) or rear (rear side) will be used, but the front (front side) indicates the direction of the traveling machine 300 for pulling the work machine 100 with respect to the work machine 100, and the rear (front side). The rear side) indicates the direction of the working machine 100 with respect to the traveling machine body 300.

(Working machine)
FIG. 1 is a rear view of the working machine 100 according to the first embodiment of the present invention. FIG. 2A is a side view of the apron 20 of the working machine 100 before being flipped up. FIG. 2B is a cross-sectional view of the periphery of the first fulcrum 31 inserted into the one end 37 of the compressive force member 30 as viewed from above. FIG. 2C is a cross-sectional view of the periphery of the second fulcrum 32 as viewed from above. As shown in FIG. 1, the working machine 100 according to the present embodiment includes a frame 10 (including a main frame 110 and a shield cover 120), a tiller rotor 102 (see FIG. 2A), an apron 20 and the like. ..

The main frame 110 of the frame 10 of the work machine 100 is attached (connected) to the rear portion of the traveling machine body 300 such as a tractor. The main frame 110 has a cylindrical shape and has a power transmission shaft inside. A gearbox 125 is attached to the main frame 110.

The rotational power from the traveling machine body 300 such as the tractor traveling forward is the PIC shaft 106 (power intake connection shaft) of the working machine 100 (see FIG. 2A), a gear (not shown) in the gearbox 125, and the main frame 110. This rotational power is transmitted to a shaft (not shown) on the left side, and this rotational power is turned to the left in the traveling direction of the working machine 100, and the rotary shaft 104 of the tiller rotor 102 (FIG. 2) is provided by the chain transmission mechanism in the chain case 105. Power is transmitted to (see (A)). Then, the working machine 100 advances along with the forward traveling of the traveling machine 300 while rotating the tilling rotor 102 to cultivate the field.

As shown in FIG. 2A, the tiller rotor 102 is a rotor that has a rotary shaft 104 and a large number of tiller claws 11 provided on the rotary shaft 104 to till the field. As shown in FIG. 1, a large number of tillage claws 11 are bent to the right or left in the traveling direction, and the area (width) in which each tillage claw 11 digs up soil is between the tillage claw 11 and the adjacent tillage claw 11. There is overlap. The tiller rotor 102 rotates so as to scoop up the soil from the front to the rear in the traveling direction. As a result, soil adheres to the inside of the apron 20.

As shown in FIG. 2A, the apron 20 is provided with respect to the rear portion of the shield cover 120 of the frame 10, and can be lowered and flipped up around the rotation fulcrum 22 fixed to the shield cover 120. It is supported by and used to level the field. The center of gravity of the apron 20 is behind the rotation fulcrum 22. Therefore, the apron 20 tends to descend due to its own weight.

A ground leveling plate 21 made of stainless steel or the like is welded to the tip of the apron 20. The ground leveling plate 21 is configured to draw a loop from the inside to the outside of the apron 20. The ground preparation plate 21 flattens the field dug up by the tiller rotor 102. Since soil may adhere to the inside of the apron 20, the inside of the apron 20 may be covered with a rubber sheet (not shown). Further, the inside of the shield cover 120 may also be covered with a rubber sheet (not shown).

Movable extension ground leveling plates 132 are provided at both ends of the ground leveling plate 21 (see FIG. 1). By opening the extension ground leveling plate 132, it becomes possible to level the ground together with the ground leveling plate 21 in a wide range.

As shown in FIG. 2B, the first fulcrum 31 is fixed to the pedestal 111 and the first tubular member 40. Further, as shown in FIG. 2C, the second fulcrum 32 is arranged on the outside of the second tubular member 50 and has a moving portion 55 that can move relative to the second tubular member 50. It is integrated and movable. Further, as shown in FIG. 2B, the first fulcrum 31 and the one end portion 37 are arranged at the same position. Since one end 37 of the compressive force member 30 does not move forward of the first fulcrum 31 in the traveling direction L, there is no need to worry that the one end portion 37 of the compressive force member 30 comes into contact with the traveling machine body 300. Further, the configuration of the permissible regulation mechanism 141 can be shortened as compared with the case where the first fulcrum and one end are arranged at different positions.

(Allowable regulation mechanism)
FIG. 3 is a side view of the working machine showing a state in which the apron 20 is flipped up. In the present embodiment, in addition to the above configuration, with respect to the flip-up of the apron 20, the permissible regulation mechanism 141 (FIG. 2 (FIG. 2)) is a combination of a permissible mechanism that allows assist movement and a regulation mechanism that regulates assist movement. A)) is provided. The permissible regulation mechanism 141 allows and regulates the second tubular member 50 to slide along the first tubular member 40.

(Allows assist operation) (See Fig. 3)
The permissible regulation mechanism 141 allows the second tubular member 50 to slide along the first tubular member 40 in allowing the apron 20 to flip up. By doing so, a force that changes the compressive force member 30 so as to contract can be applied to the first fulcrum 31 arranged on the pedestal 111 provided on the main frame 110 and the pedestal 134 provided on the apron 20. The distance between the second fulcrum 32 to be arranged can be shortened. As a result, the apron 20 connected to the second fulcrum 32 is powered in the direction of flipping up.

(Regulate assist operation) (See Fig. 6)
Further, the permissible regulation mechanism 141 regulates the second tubular member 50 from sliding along the first tubular member 40 in regulating the assisting operation of flipping up the apron 20. By doing so, the compression force member 30 is restricted from contracting, and as a result, the flip-up assist operation of the apron 20 is restricted.

The permissible regulation mechanism 141 includes first holes 41a and 41f of the first tubular member 40 (inner tubular member), second holes 51 of the second tubular member 50 (outer tubular member), and a second tubular member. It has a pin 61 and the like of a lock mechanism 60 attached to 50. The permissible regulation mechanism 141 may include a portion of the lock mechanism 60 other than the pin 61 described above. Of the compressive force member 30, the first tubular member 40, and the second tubular member 50 that operate by the permissible regulation mechanism 141, the compressive force member 30 will be described first, and then the first tubular member 40. The second tubular member 50 will be described.

(Structure of compressive force member)
FIG. 4A is a cross-sectional view when the compressive force member 30 is extended, and FIG. 5 is a cross-sectional view when the compressive force member 30 is contracted. In the present embodiment, the compressive force member 30 is stretched beyond the free length by receiving a load and tries to return to the free length (for example, a retractable gas spring model number GZ-15 to GZ of ACE Co., Ltd.). -40 was used). The compressive force member 30 is extended to the first length N1 as the distance between the first fulcrum 31 and the second fulcrum 32 increases (see FIGS. 2 (A) and 4 (A)). As the distance between the first fulcrum 31 and the second fulcrum 32 decreases, the compressive force increases and shrinks to the second length N2, which is shorter than the first length N1 (see FIGS. 3 and 4B). A force is applied in the direction of flipping up the apron 20 while decreasing.

The first length N1 and the second length N2 are values that change due to deterioration over time. That is, the first length N1 and the second length N2 of the compressive force member 30 may weaken and become longer as the number of times the permissible regulation mechanism 141 is used.

The compressive force member 30 is sold in a free length at the stage of the sales channel, and remains in a free length when the apron 20 is flipped up and assembled to the working machine 100. Then, when the apron 20 is lowered, the compressive force member 30 is extended from the free length to the first length N1 (see FIG. 4 (A)).

Further, when the apron 20 shifts from the lowered state to the raised state by being flipped up, the compressive force member 30 contracts to the second length N2 (at this time, contracts toward the free length) (see FIG. 5). As described above, the compressive force member 30 may be a member that has a compressive force that is extended from the free length to a dimension longer than the free length. Hereinafter, an example of the compressive force member 30 will be described, but the configuration of the compressive force member 30 may not be limited to the configuration. Next, the first tubular member 40 and the second tubular member 50 will be described.

(Structure of combination of first tubular member and second tubular member)
FIG. 4A is a cross-sectional view showing a state in which the pin 61 of the permissible regulation mechanism 141 is inserted into the second hole 51 and the first hole 41f. FIG. 4B is an enlarged side view of the rotating portion 66. FIG. 5 is a cross-sectional view showing a state in which the pin 61 in the permissible regulation mechanism 141 is removed from the second hole 51 and the first hole 41f when the compressive force member 30 contracts.

As shown in FIG. 4A, the permissible regulation mechanism 141 fixes the position of the second tubular member 50 with respect to the first tubular member 40 so that the compressive force member 30 does not contract forward. It is configured in. While the regulation of the permissible regulation mechanism 141 is not functioning, the first tubular member 40 and the second tubular member 50 can move on the same axis. Further, as shown in FIG. 5, in the permissible regulation mechanism 141, when the compressive force member 30 contracts forward, the second tubular member 50 moves relatively forward with respect to the first tubular member 40. It is configured as follows.

The first tubular member 40 formed in a tubular shape is formed with first holes 41a and 41f as a part of the permissible regulation mechanism 141. The second tubular member 50 formed in a tubular shape is formed with a second hole 51 as a part of the permissible regulation mechanism 141. The first tubular member 40 is inserted into the second tubular member 50. A resin-made tubular collar (resin collar) (not shown) is provided between the two to prevent the generation of abnormal noise due to sliding between the first tubular member 40 and the second tubular member 50. There is.

Here, the explanation returns to FIG. The first tubular member 40 is arranged outside the compressive force member 30, and one end portion 37 of the compressive force member 30 is connected to the first tubular member 40. Here, the first fulcrum 31 is inserted into the hole 111a of the pedestal 111 and the hole 40a of the first tubular member 40. Then, one end 37 of the compressive force member 30 is fixed to the first tubular member 40.

The second tubular member 50 is arranged outside the first tubular member 40, and the other end 38 of the compressive force member 30 is connected to the second tubular member 50. Here, the pin 36 is inserted into the hole 50a of the second tubular member 50 and the elongated hole 40X of the first tubular member 40. Then, the other end 38 of the compressive force member 30 is fixed to the second tubular member 50.

Here, the first fulcrum 31 is provided on the front side portion of the first tubular member 40. The second fulcrum 32 is provided on the moving portion 55 on the outer peripheral surface of the second tubular member 50. In the state of FIG. 4A, the compressive force member 30 is in a state of being pulled while being urged in the direction of contraction. Therefore, in the tension state as shown in FIG. 4A, the other end 38 tends to move in the direction approaching the cylinder 251 (direction toward the front side).

When the pin 61 is removed from the first hole 41 and the second hole 51 and the apron 20 is lifted, the compressive force member 30 contracts. Then, the pin 36 attached to the other end 38 of the compressive force member 30 moves forward along the elongated hole 40X. Since the pin 36 is connected to the second tubular member 50, the second tubular member 50 moves to the front side, and the flange 59 fixed to the second tubular member 50 also moves to the front side. Along with the flange 59, the moving portion 55 and the second fulcrum 32 move to the front side. As the second fulcrum 32 (see FIG. 2C) moves to the front side, the apron 20 is rotated by applying an assist force in the direction of flipping up. The second fulcrum 32 is fixed to the moving portion 55.

Further, the first fulcrum 31 is provided at the connection portion between the front side portion of the first tubular member 40 and the pedestal 111 of the main frame 110, and one end portion 37 of the compressive force member 30 does not move to the front side of the first fulcrum member 31. It is composed.

(Structure of lock mechanism)
Here, the locking mechanism 60 will be described with reference to FIGS. 4A and 5. The permissible regulation mechanism 141 has a lock mechanism 60. The lock mechanism 60 is fixed to the second tubular member 50. The force in the direction of shortening the distance between the first fulcrum 31 and the second fulcrum 32 is not applied. As a result, the assist of the apron 20 of the permissible regulation mechanism 141 can be regulated at the time of tilling. Since the lock mechanism 60 is arranged on the rear side of the second tubular member 50, the user can touch the rotating portion 66 without reaching for the rotating portion when the apron 20 is flipped up. 66 can be operated.

In the present embodiment, the lock mechanism 60 includes a pin 61, a spring 62, a support portion 67, and a rotating portion 66. The pin 61 is a member that can be inserted into the second hole 51 and the first hole 41 (the first hole 41a and the first hole 41f). A pin 61 is inserted into the spring 62.

The support portion 67 supports the pin 61 so as to be movable in the axial direction. The support portion 67 is formed here in a housing. Further, inside the support portion 67, a guide member 53 for guiding the pin 61 to move in the axial direction is provided. The rotating portion 66 is rotatably supported around a predetermined rotating center 61X provided on the pin 61, and has a cam portion 66a. When the cam portion 66a of the rotating portion 66 rotates while abutting on the support portion 67, the position of the rotation center 61X moves in the axial direction of the pin 61, and the pin 61 moves in the axial direction.

The pin 61 as a part of the permissible regulation mechanism 141 is a member that can be inserted and removed from the second tubular member 50. The pin 61 locks (relatively fixes) the second tubular member 50 to the first tubular member 40 by being inserted into the second hole 51 and the first hole 41 in a superposed state. .. On the contrary, when the pin 61 is removed from the second hole 51 and the first hole 41, the second tubular member 50 becomes relatively movable with respect to the first tubular member 40.

The lock mechanism 60 can be locked when the apron 20 is placed at the uppermost position S1 (see FIG. 3) or the lowest position S2 (see FIG. 2).

As shown in FIG. 4B, the rotating portion 66 has a cam portion 66a. The cam portion 66a has a first protruding portion 66a1 having a turning radius r1 having a large turning radius from the rotation center 61X and a second protruding portion 66a having a turning radius r2 having a small turning radius from the turning center 61X. It has 66a2 and.

When the rotating portion 66 rotates in the first direction J1, the cam portion 66a moves from the first contact position M1 where the first protruding portion 66a1 of the cam portion 66a abuts on the support portion 67 to the second cam portion 66a. The protruding portion 66a2 rotates to the second contact position M2 in contact with the support portion 67. Along with this, the pin 61 descends with respect to the support portion 67 and is inserted into the second hole 51 and the first hole 41, and the position of the second tubular member 50 with respect to the first tubular member 40 is fixed.

On the contrary, when the rotating portion 66 rotates in the second direction J2, the cam portion 66a moves from the second contact position M2 where the second protruding portion 66a2 of the cam portion 66a abuts on the support portion 67 to the cam portion 66a. The first protruding portion 66a1 of the above rotates to the first contact position M1 in contact with the support portion 67. Along with this, the pin 61 rises with respect to the support portion 67 and comes off from the second hole 51 and the first hole 41, and the position of the second tubular member 50 with respect to the first tubular member 40 is released from being fixed. ..

At the time of tilling, the pin 61 is inserted into the superposed second hole 51 and the first hole 41. Then, the compressive force member 30 does not shrink, and the movement of the second tubular member 50 to the front side with respect to the first tubular member 40 is restricted. As a result, the apron flip-up assist function is not exhibited.

On the contrary, the pin 61 is removed from the superposed second hole 51 and the first hole 41. Then, the compressive force member 30 can be contracted, and the second tubular member 50 can move forward with respect to the first tubular member 40. As a result, the apron flip-up assist function is exhibited.

(Allowable assist operation)
Hereinafter, the operation of the working machine 100 will be described. First, the operation of flipping up the apron 20 will be described with reference to FIGS. 2 to 5. When the rotating portion 66 is operated from the standing state shown in FIG. 2A to the lying state shown in FIG. 3, the pin 61 is raised and the pin 61 is removed from the first hole 41f and the second hole 51. Will be done. Then, the compressive force member 30 contracts, and the other end 38 of the compressive force member 30, the second tubular member 50, and the apron 20 can be integrally moved forward in the traveling direction L.

If the apron 20 is to be flipped up in such a state, the other end 38 of the compressive force member 30 contracts to the front side in the traveling direction L, and the second tubular member 50 moves forward, so that the apron 20 bounces. Due to the raising operation, the assisting force of the compressive force member 30 is exerted, and the apron 20 is easily flipped up.

Then, although not shown, the user rotates the rotating portion 66 in the first direction J1 with the apron flipped up, and inserts and fixes the pin 61 into the superposed second hole 51 and the first hole 41a. .. That is, the lock mechanism 60 serves as a safety device for preventing the apron 20 from falling.

(Regulation of assist operation)
FIG. 6 is a cross-sectional view of the working machine 100 at the time of tilling. With reference to FIG. 6 and FIG. 3 described above, the operation of the permissible regulation mechanism 141 during tillage will be described below. First, as shown in FIG. 2, the working machine 100 travels with the apron 20 located at the lowest position S2. When the rotating portion 66 is rotated in the upright state, the pin 61 is in a state of being inserted into the first hole 41f and the second hole 51. The second tubular member 50 is arranged relatively rearward with respect to the first tubular member 40. Then, the apron 20 is maintained in a lowered state.

Then, when the work machine 100 travels in the traveling direction L in this state, when the ground preparation plate 21 comes into contact with the field and the apron 20 is flipped up, the moving portion 55 also refers to the second tubular member 50. It operates relatively in the traveling direction L, and there is room for the ground preparation plate 21 to rise. However, since the compressive force member 30 is not compressed at this time, the apron 20 does not jump up too much. That is, the apron 20 jumps up only by the reaction received from the field.

(Second Embodiment)
FIG. 7 is a cross-sectional view showing a state in which the apron 20 is lowered in the working machine 200 according to the second embodiment. FIG. 8 is a cross-sectional view of the working machine 200 in a state where the apron 20 is flipped up. The second embodiment is different in that the compressive force member 130 is used instead of the compressive force member 30 of the first embodiment. The compressive force member 130 is a tension spring that is stretched beyond its free length by receiving a load and tries to return to its free length. The compressive force member 130 includes a spring portion 130A having a compressive force by being pulled, a hook portion formed on the rear end side of the spring portion 130A (this portion is referred to as the other end portion 38), and a front end of the spring portion 130A. It has a hook portion (this portion is referred to as one end portion 37) formed on the side.

FIG. 9 is a cross-sectional view showing a state in which the pin 61 of the permissible regulation mechanism 241 is inserted into the first hole 41f and the second hole 51. FIG. 10 is a cross-sectional view showing a state in which the pin 61 of the permissible regulation mechanism 241 is removed from the first hole 41f and the second hole 51. The pin 36 is hooked on the other end 38, and the first fulcrum 31 is hooked on the one end 37.
In the state of FIG. 9, when the user rotates the rotating portion 66 in the second direction J2, the pin 61 is removed from the first hole 41f and the second hole 51.

Then, the second tubular member 50 can move in the traveling direction L relative to the first tubular member 40. Since a force trying to return to the free length acts on the compressive force member 130, the other end 38 of the compressive force member 130 also moves in the traveling direction L, and the pin 36 also moves in the traveling direction L. Since the pin 36 is connected to the second tubular member 50, the second tubular member 50 also moves in the traveling direction L. Then, in the lock mechanism 60, the pin 61 has the second hole 51 approaching the first hole 41a.

FIG. 11 is a side view of the working machine 200 at the time of tilling. Even if the apron 20 is arranged at the lowest position S2 in the state of FIG. 7, when the working machine 200 travels in the field, the ground leveling plate 21 comes into contact with the field and is flipped up. At this time, the moving portion 55 can move in the traveling direction L relative to the second tubular member 50. Therefore, there is room for the apron 20 to rise.

According to the configuration of the first embodiment or the second embodiment described above, in the work machines 100 and 200 having an assist configuration for assisting the flip-up of the apron 20, the state before the apron is flipped up is changed to the state after the apron is flipped up. It is avoided that the assist configuration is expanded accordingly.

The above-mentioned allowable regulation mechanisms 141 and 241 have a configuration having a plurality of (here, one) compressive force members 30 and 130, but the present invention is not limited to this configuration, and one compressive force member 30 and 130 is included. Alternatively, the configuration may have two or more.

10: Frame, 11: Tillage claw, 20: Apron, 21: Ground plate, 22: Rotating fulcrum, 30: Compressive force member, 31: 1st fulcrum, 32: 2nd fulcrum, 36: Pin, 37: One end , 38: other end, 40: first tubular member, 40X: elongated hole, 41: first hole, 41a: first hole, 41f: first hole, 50: second tubular member, 51: second Hole, 53: Guide member, 55: Moving part, 56: Inner frame, 59: Flange, 60: Lock mechanism, 61: Pin, 61X: Rotating center, 62: Spring, 66: Rotating part, 66a: Cam part , 66a1: 1st protruding part, 66a2: 2nd protruding part, 67: support part, 100: working machine, 102: tiller rotor, 104: rotating shaft, 105: chain case, 106: PIC shaft, 110: main Frame, 111: pedestal, 120: shield cover, 125: gearbox, 130: compressive force member, 130A: spring part, 132: extension ground plate, 134: pedestal, 141: allowable regulation mechanism, 200: working machine, 241: Allowable regulation mechanism, 251: Cylinder, 252: Piston rod, 300: Traveling machine, J1: 1st direction, J2: 2nd direction, L: Travel direction, M1: 1st contact position, M2: 2nd contact position , R1: turning radius, r2: turning radius, S1: top position, S2: bottom position

Claims (4)

Is attached to the rear of the vehicle body, in proceeding with the forward travel of the previous Symbol traveling vehicle body work machine for tilling the field,
A frame connected to the rear part of the traveling machine and
An apron provided at the rear of the frame, which is rotatably supported by lowering and flipping up with respect to the frame, and leveling the field.
The increased compression force in accordance with the distance increases between the second fulcrum provided in the first supporting point and the apron is provided in the frame, the distance between the second fulcrum and the first fulcrum a compression member applying a force in the direction of compression force splashed the apron diminishing in accordance with the shorter,
A first tubular member arranged outside the compressive force member and to which one end of the compressive force member is connected.
A second tubular member that is slidably arranged along the first tubular member and is connected to the other end of the compressive force member on the outside of the first tubular member.
A lock mechanism for fixing the second tubular member relative to the first tubular member,
A working machine equipped with. The lock mechanism has a pin that can be inserted and removed from the second tubular member.
When the first hole formed in the first tubular member and the second hole formed in the second tubular member are in an overlapping position, the pin is inserted into the first hole and the second hole. By doing so, the second tubular member is relatively fixed to the first tubular member.
The working machine according to claim 1 , wherein the pin is removed from the first hole and the second hole so that the second tubular member can move relative to the first tubular member. .. The working machine according to claim 1 or 2 , wherein the compressive force member is a plurality. The working machine according to any one of claims 1 to 3 , wherein the compressive force member is a tension gas spring or a tension spring that is extended beyond the free length by receiving a load and tries to return to the free length. ..

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