JP2010200722A - Apparatus for restoring extension leveler in folding implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To return an extension leveler to a state before rotation when the extension leveler receives an external force from a ridge, etc., and is rotated relative to an extension apron in a folding implement that is equipped with a body implement positioned behind a tractor and an extension implement foldably connected to the body implement in which the extension implement has the extension apron covering an extension rotor to be connected to a body rotor of the body implement and the extension leveler to be swingably connected to the rear of the extension apron. <P>SOLUTION: The extension leveler 11 is interlocked with shake of a body leveler 6 and shakable in a state in which the extension implement 7 is connected to the body implement 2. When the extension implement 7 is in a folded state and the extension leveler 11 receives an external force, the folding implement is rotatable relative to the extension apron 5. The folding implement is equipped with an urging member 23 that directly or indirectly urges the extension leveler 11 to a side in which the extension leveler 11 is interlocked with the body leveler 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a folding working machine having a main working machine located behind a tractor and an extending working machine that is foldably connected to the main working machine such as a plow working machine and a tilling working machine, and is swingable to the rear of the extension working machine. The present invention relates to a restoring device for returning the extension leveler to its pre-rotation state when the extension leveler connected to is rotated in response to external force in the folded state of the extension work machine.

  In a folding work machine having a main work machine connected to the rear part of the tractor and an extension work machine that is foldably connected to both sides or one side of the main work machine, the extension work machine is unfolded, that is, the extension work machine is connected to the main work machine. It is necessary to link the extension work machine to the main work machine in the connected state.

  The main work machine and the extension work machine are each composed of a rotor driven by the power from the tractor and a shield cover covering the upper side, and tilling claws projecting on the rotary shaft constituting the rotor behind the shield cover, etc. An apron for preventing the earth and sand scattered by the claws from scattering backward is rotatably connected around an axis parallel to the rotor (rotary shaft). Behind the apron, a leveler for leveling the soil in the vicinity of the farm scene is connected so as to be swingable around an axis parallel to the rotor.

  While working with the extension work machine deployed, the rotor (rotary shaft) of the extension work machine is connected to the rotor (rotary shaft) of the main work machine so that power can be transmitted from the main work machine. On the other hand, the apron behind the shield cover covering each rotor (rotary shaft) can behave independently depending on the degree of unevenness in the field. For this reason, if the apron of the extension work machine and the apron of the main work machine are independent, the leveler connected to each may not be able to level the field scene.

  For this reason, in order to effectively use the functions of each leveler, the apron (extension apron) and the leveler (extension leveler) of the extension work machine are linked to the apron (main body apron) and the leveler (main leveler) of the main work machine, respectively. Therefore, it is necessary to install linkage members for interlocking with the apron and the leveler of the main body working machine on the apron and the leveler of the extension working machine, respectively (see Patent Documents 1 and 2).

  Here, when the extension machine is in the folded state as shown in FIG. 1, if the leveler (extension leveler) of the extension machine can swing freely with respect to the apron (extension apron), When the folding work machine moves (runs) as it is, the leveler may be violated by vibration, and the apron or the leveler may be damaged, or noise may be generated. Therefore, in order to avoid the damage of the extension leveler and the extension apron, it is appropriate to restrain the extension leveler to the extension apron so that the extension leveler cannot vibrate freely due to vibration as in Patent Document 1.

  Each apron is rotatably connected to the back of the shield cover, and the leveler is swingably connected to the back of each apron, so the linkage members are installed separately for the apron and the leveler of the extension work machine, respectively Behaves together with an apron and an extended leveler. For example, as disclosed in Patent Document 1, the link member for the extension leveler has a locked portion on the main body work machine side where the main body work machine can be locked in the direction of the link, and the extended work machine side has a locked portion. Has a locking portion for transmitting the force received to the extension work machine and maintaining the state of being locked to the extension work machine in the direction of linkage.

  In Patent Document 1, the locking portion of the linkage member that penetrates the side plate of the extension leveler is inserted into a recess formed in the side plate of the extension apron, and the locking portion is recessed in the direction of positive and negative swinging that the extension leveler is about to rotate. The rotation angle of the extension leveler with respect to the extension apron is limited by engaging with. In this case, the front end of the locking part enters the concave part of the side plate and engages with the inner peripheral surface of the concave part in any rotation direction, so that the locking part is prevented from coming out and the extension leveler is free from the extension apron. Rotation is prevented.

JP 2007-185124 A (Claim 1, paragraphs 0031 to 0036, FIGS. 1 to 10) JP 2007-61033 A (Claim 2, paragraphs 0019 to 0031, FIGS. 5 to 12)

  However, as shown in FIG. 1, when the extension work machine enters the field from a hoe or the like in a folded state, the leveler of the extension work machine may collide with the upper surface of the hoe or the like depending on the height of the hoe or the like. Therefore, if the rotation of the extension leveler with respect to the extension apron is completely prevented, the extension leveler may be damaged by a collision with a bag or the like.

  The soil that makes up the fence may be hardened or the fence itself may be made of concrete. In such a case, if the extension leveler collides with the fence, the extension leveler may be damaged. It is assumed that it is impossible to lock the linking member to the leveler at the time of connection with the main body working machine.

  On the other hand, if the extension member receives the external force from the eaves or the like and the linkage member is detached from the extension apron and the extension leveler is kept in the state of being flipped up, the linkage member integrated with the extension leveler also becomes the extension apron. It is in a rotated state. In this case, since the above-described locked portion is displaced from the locking position of the main body leveler, the extension leveler of the linking member is linked to the main body leveler when the extension work machine shifts from the folded state to the connected state. No longer.

  In the present invention, when the extension work machine enters the field from the ridge while the extension work machine is in the folded state, the extension leveler is rotated when the extension leveler receives an external force from the heel or the like and rotates with respect to the extension apron. The present invention proposes a restoration device for an extension leveler in a folding machine having a function of returning to a state before rotation.

The extension leveler restoring device in the folding working machine according to claim 1 is connected to the rear part of the tractor and is located behind the main body apron that covers the main body rotor driven by the power from the tractor. A main body working machine having a main body leveler swingable around an axis parallel to the rotor, an extension apron that covers the extension rotor connectable to the main body rotor of the main body working machine, and an extension apron located behind the extension apron. Having an extension leveler swingable around a parallel axis, and having an extension working machine that can be folded with respect to the main body working machine,
When the extension work machine is connected to the main body work machine, the extension leveler swings in conjunction with the main body leveler swinging,
In the folding work machine that is rotatable with respect to the extension apron when the extension work machine is in a folded state and the extension leveler receives an external force,
The extension leveler includes a biasing member that biases the extension leveler directly or indirectly to a side where the extension leveler can be interlocked with the main body leveler.

  The extension leveler of the extension work machine has a locked portion where the leveler of the main work machine (main body leveler) can be locked in the direction of linkage when the extension work machine is connected (deployed) to the main work machine. A link member for an extension leveler having a locking part for transmitting the force received by the locking part to the extension work machine is attached to the extension leveler. In the connected (deployed) state of the extension work machine to the main work machine, the linkage member is linked to the main work machine and the extension work machine, so that the extension leveler is interlocked with the swing of the main work machine leveler (main body leveler). Swings.

  Specifically, the extension leveler and the main body leveler are locked to or engaged with at least one of the swinging directions of the locked portion of the linkage member, so that the force from the main body leveler is applied to the locked portion of the linkage member. Is transmitted to the extension leveler, and the extension leveler swings in conjunction with the swinging of the main body leveler. If the main body leveler is locked in any (positive or negative) swing direction to the locked portion, the extension leveler swings in conjunction with the positive / negative swing of the main body leveler.

  In addition, in the state where the extension work machine is connected to the main body work machine, the force received from the main body leveler can be removed from the state where the locking portion of the linkage member is locked to the extension apron as described below. While transmitting to the extension leveler through the linkage member, the extension leveler can swing with respect to the extension apron, and the swinging amount (angle) of the extension leveler linked to the main body leveler is limited.

  The state in which the main body leveler is locked to the locked portion of the linkage member is maintained when the extension work machine is in the unfolded state (when the folding work machine is in the working state), and the extension work machine is shifted to the folded state. Sometimes the linking member is detached from the main body leveler to release the locked state of the main body leveler to the locked portion.

  The linkage member is installed on the extension leveler so that it can always swing with the extension leveler with respect to the extension apron regardless of the connection state (deployed state) and the folded state of the extension work machine, that is, the rotation shaft of the extension leveler. It can be rotated around an axis parallel to the axis. For example, the locking portion of the linkage member is locked or engaged with the extension apron in any swinging direction, so that the rotation of the extension leveler with respect to the extension apron in that direction is prevented.

  Since the linkage member swings (rotates) with the extension leveler with respect to the extension apron, it is directly supported by the extension leveler, but indirectly with the extension leveler around the connecting shaft parallel to the axis of the extension rotor. It is supported by an extended apron so that it can rotate. The extension leveler is locked to the extension apron while the locking part of the linking member is locked to the extension leveler when the extension work machine is folded, so that the connecting shaft to the extension apron is centered as shown in FIG. Maintain the suspended state due to its own weight. In a state where the extension leveler is suspended from the connecting shaft, the extension leveler rotates within a range that can swing around the connecting shaft with respect to the extension apron.

  When the extension leveler 11 receives an external force in the direction of flipping up (the direction in which the lower surface side of the extension leveler overlaps the lower surface side of the extension apron) as shown by the two-dot chain line from the state shown by the solid line in FIG. Alternatively, by rotating around the connecting shaft in the direction against the restoring force of the urging member, the action of an impact due to receiving an external force while stopped is avoided.

  When working with the folding work machine advanced while the extension work machine is in the folded state, if you try to lower the folding work machine to the normal work position (level) in an attempt to start work from the edge, folding work Since the machine descends abruptly by several hundreds of millimeters, the extension leveler of the extension work machine connected to the rear of the tractor as described above may collide with the upper surface of the ridge or the slope.

  Here, in the present invention, when the extension work machine is in the folded state, the extension leveler can be rotated with respect to the extension apron by receiving an external force, so that the extension leveler can freely move with respect to the extension apron by the action of the external force. It can swing and escape from the bag. For this reason, the extension leveler does not receive a shocking force from the heel or the like, the occurrence of damage due to the external force is avoided, and the situation where the linkage with the main body leveler becomes impossible due to the damage is also avoided. .

  When the locking portion of the linking member is engaged with the extension apron in a state in which the locking portion of the linking member is prevented from being pulled out from the recess as described in Patent Document 1, at least one of the locking portion and the recess is bent by an external force. The extension leveler cannot swing unless it is deformed (plastically deformed) or broken, and the locking portion cannot be detached from the recess of the extension apron. On the other hand, in the present invention, the extension leveler can rotate with respect to the extension apron by receiving an external force, so that the locking portion does not break and the extension leveler and the extension apron are damaged. There is no occurrence.

  Here, if the extension leveler rotates with respect to the extension apron and maintains the state of being flipped up, the linkage member integrated with the extension leveler is also in the state of rotation with respect to the extension apron and is locked. Since the portion is displaced from the locking position of the main body leveler, the connecting member of the extension leveler is not linked to the main body leveler when the extension working machine shifts from the folded state to the connected state.

  On the other hand, in the present invention, since the extension leveler is provided with a biasing member that biases the extension leveler directly or indirectly to the side where the extension leveler can be interlocked with the main body leveler, the effect of external force is eliminated at the same time. The extension leveler can be returned to the state before the rotation of the extension leveler, that is, to the position where the locked portion of the linkage member matches the locking position of the main body leveler, so that the extension working machine is unfolded from the folded state. It is possible to shift to a state where the main body leveler is locked to the locked portion, and to return the extension leveler to a state where it can be interlocked with the main body leveler.

  The state in which the extension leveler can be interlocked with the main body leveler refers to a state in which the extension leveler can swing in conjunction with the swinging of the main body leveler when the extension work machine shifts from the folded state to the deployed state. The “side that can be interlocked” refers to the direction in which the extension leveler can be interlocked with the main body leveler. That is, the urging member urges the extension leveler directly or indirectly to a position where the extension leveler is interlocked with the main body leveler. Specifically, the urging member is extended only by a deployment operation of the extension work machine until the main body leveler of the main work machine is locked or engageable with the locked portion of the linkage member of the extension leveler. To return.

  Therefore, the urging member forcibly returns the extension leveler to the suspended state even when the extension leveler cannot return to the suspended state by its own weight around the connecting shaft after receiving the external force from the eaves or the like.

  The urging member retains a restoring force by elastically deforming at least when the extension leveler receives an external force. By this restoring force, the extension leveler that is rotated with respect to the extension apron by receiving the external force is restored to the state before the rotation. Therefore, the reaction force by energizing the extension leveler is received from the extension leveler. In this relation, in order to effectively apply the restoring force of the urging member to the extension leveler, it is desirable that the urging member is installed in the extension apron. However, the urging member is directly or indirectly connected to the extension apron. Since the restoring force acts on the extension leveler across the extension leveler, it may be installed on the extension leveler.

  “The biasing member directly biases the extension leveler” means that one end of the biasing member is directly connected to, for example, any part of the extension leveler, and the biasing member directly biases the extension leveler. Say. Any part of the extension leveler refers to, for example, the side plate of the extension leveler or the above-described linkage member integrated with the side plate. “The biasing member indirectly biases the extension leveler” means that, for example, an interlocking member described later is interposed between the biasing member and the extension leveler, and the restoring force of the biasing member is extended through the interlocking member. Say to act on.

  “The elastic member deforms at least when receiving an external force” means that the extension leveler may be elastically deformed even in a normal state where no external force is applied. Since the restoring force of the member always acts in the return direction on the extension leveler (Claim 2), the extension leveler is suspended from the connecting shaft and stabilized in a state where it can be interlocked with the main body leveler unless it receives external force. . As a result, it is possible to improve the stability of the extension leveler during normal times, and to prevent the extension leveler from running out of control when the folding machine is running, that is, disorderly behavior.

  The biasing member can be set so that the restoring force acts on the extension leveler only when the extension leveler rotates relative to the extension apron by setting the extension leveler in a normal state where the extension leveler can be linked to the main body leveler. Regardless of the rotation of the extension leveler, the restoring force can always be applied to the extension leveler.

  A state in which the restoring force of the urging member always acts on the extension leveler is a normal state in which the extension leveler can be interlocked with the main body leveler, and the urging member can apply the restoring force in advance. For example, when the urging member is a coil spring, the restoring force is applied in advance by applying a tensile force or a compressive force from the natural length state, and in the case of a torsion spring, a torsional moment (torque) is applied. It is held by force members.

  As described above, if the biasing member is straddled between the extension leveler and the extension apron, it can take the reaction force from the extension apron and give the extension leveler a restoring force, so the biasing member is directly connected to the extension leveler. Sometimes connected indirectly. However, in order to effectively apply the restoring force of the urging member to the extension leveler, i.e., to enlarge the restoring force and transmit it to the extension leveler, an indirect member is interposed between the urging member and the extension leveler. It is often advantageous to rotate or turn (swing) this member.

  Therefore, if the extended apron supports (for example, pivotally supports) an interlocking member that rotates in conjunction with the swing of the extension leveler, and the urging member is connected to the interlocking member (Claim 3), the restoration is performed. Since the force can be expanded and transmitted to the extension leveler, it is possible to reduce the ability or scale of the biasing member to perform the necessary function of returning the rotated extension leveler. is there. In this case, since the restoring force of the urging member is amplified by the rotation of the interlocking member and transmitted to the extension leveler, it is possible to effectively return the extension leveler with a small restoring force.

  Further, as described above, the extension leveler is provided with a linkage member that swings the extension leveler in conjunction with the swing of the main body leveler when the extension work machine is connected to the main body working machine. In order to rotate around an axis parallel to the rotation axis of the extension leveler, if the interlocking member supported by the extension apron is engaged with this linking member (Claim 4), the extension work machine in the folded state (extension work) When the machine is folded with respect to the main body working machine), the rotation of the interlocking member is easily transmitted to the extension leveler.

  For example, if the interlocking member is directly connected to the extension leveler, it is necessary to lock or engage the interlocking member with the extension leveler in order to transmit the rotation of the interlocking member to the extension leveler. Since it is reasonable to rotate integrally and be formed in a rod shape, it is easy to obtain an engaged state by engaging the interlocking member with the linkage member instead of the extension leveler. The linkage member rotates with the extension leveler around the axis parallel to the extension rotor (the connecting axis that connects the extension leveler to the extension apron), so that the linkage member rotates around the axis parallel to this axis. Since it is freely supported by the extension leveler, it is reasonable to form it in a round bar shape or the like.

  In this case, it is necessary to add a special part for engaging the interlocking member with the extension leveler when the interlocking member coupled to the biasing member and interlocking with the biasing member is engaged with the interlocking member of the extension leveler. Therefore, it is possible to reduce the number of parts, reduce the weight of the extension leveler, and reduce the cost.

  By providing an urging member that urges the extension leveler directly or indirectly to the side where the extension leveler can be interlocked with the main body leveler, the action of external force is eliminated and at the same time the extension leveler is The extension leveler can be returned to the state, that is, the position where the locked portion of the linking member matches the locking position of the main body leveler. As a result, simply by unfolding the extension work machine from the folded state, the main body leveler can be shifted to a state where the main body leveler is locked to the locked portion of the linkage member, and the extension leveler can be returned to a state where it can be interlocked with the main body leveler. .

  In addition, when the extension work machine is in the folded state, the extension leveler can rotate with respect to the extension apron by receiving an external force, so that the extension leveler can freely swing with respect to the extension apron by the action of the external force. The extension leveler will not receive shocking force from the heel, etc., and damage due to external force will be avoided, and it will be impossible to link with the main body leveler due to the damage. Things are also avoided.

It is the side view which showed the example of a structure of the relationship between the extension apron and the extension leveler in a folding work machine when an extension work machine is in a folding state, and a restoring device (biasing member and interlocking member). It is the top view which showed the relationship between the apron and leveler of both work machines when the extension work machine shown in FIG. 1 exists in a main body work machine and a connection state (expanded state). FIG. 2 is a partially enlarged view of FIG. 1 showing a normal state and a rotating state of an urging member and an interlocking member. It is the side view which showed the example of a structure of the other decompression | restoration apparatus when an extension work machine exists in a folding state. FIG. 5 is a plan view showing a relationship between an apron and a leveler of both work machines when the extension work machine shown in FIG. 4 is in a connected state (deployed state) with the main body work machine. FIG. 5 is a partially enlarged view of FIG. 4 illustrating a normal state and a rotating state of the urging member and the interlocking member. It is the side view which showed the example of a structure of the other decompression | restoration apparatus when an extension work machine exists in a folding state. FIG. 8 is a plan view showing a relationship between an apron and a leveler of both work machines when the extension work machine shown in FIG. 7 is in a connected state (deployed state) with the main body work machine. FIG. 8 is a partially enlarged view of FIG. 7 showing a normal state and a rotating state of the urging member and the interlocking member. It is the elevation view which showed the back side of the folding working machine when the extension working machine is in the unfolded state. (A) is the perspective view which showed the connection part of the extension leveler and main body leveler at the time of forming a recessed part in the side plate of a main body leveler, (b) is the extension leveler and main body leveler at the time of forming a convex part on the side plate of a main body leveler. It is the perspective view which showed these connection parts. FIG. 2 is a partially enlarged view of FIG. 1 illustrating an example in which an urging member is installed between an extension apron and an extension leveler and a restoring force from the urging member is directly transmitted to the extension leveler.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 shows a main body working machine 2 having a main body apron 5 and a main body leveler 6 connected to the rear portion of the tractor 40 as shown in FIG. 1 shows a side view of a folding working machine (hereinafter, working machine) 1 provided with an extension working machine 7 having 11. FIG. 1 also shows that the extension leveler 11 is kept suspended from the extension apron 10 by its own weight when the extension work machine 7 is in the folded state.

  The main body working machine 2 is disposed at the rear part of the tractor 40, and a main body shield cover 4 that covers the main body rotor 3 that is driven by receiving power from the tractor 40, a main body apron 5 connected to the rear thereof, and a rear of the main body apron 5. It has a main body leveler 6 that is positioned and swingable about an axis parallel to the main body rotor 3. The extension work machine 7 is located behind the extension shield cover 9 that covers the extension rotor 8 that can be connected to the main body rotor 3 of the main work machine 2, the extension apron 10 connected to the rear thereof, and the extension apron 10. 8 has an extension leveler 11 that can swing around an axis parallel to 8, and is supported so as to be foldable with respect to the main body working machine 2.

  As shown in FIG. 1, the main body work machine 2 as the main body of the work machine 1 includes a top mast 12 connected to a three-point link hitch mechanism including a top link and a lower link at the rear of the tractor 40, and a lower link connection part 13. The tractor 40 is mounted on the rear portion of the tractor 40 through the three-point link hitch mechanism so as to be movable up and down.

  A gear box 14 connected to the PTO shaft of the tractor 40 via a universal joint, a transmission shaft, and the like is disposed at the lower end portion of the top mast 12, and as shown in FIG. A transmission frame 15 and a support frame 16 are installed in the direction. The power from the PTO shaft is transmitted to the input shaft of the gear box 14, and the power received by the input shaft is transmitted to the transmission shaft that is inserted through the transmission frame 15.

  A chain transmission case 17 is fixed to the tip of the transmission frame 15 so as to hang down, and an end cover 18 facing the chain transmission case 17 is fixed to the tip of the support frame 15. A rotary shaft 3a of the main body rotor 3 is installed between the chain transmission case 17 and the end cover 18 so as to be rotatable about the axis. A chain is stretched between the chain transmission case 17 and the rotary shaft 3a, and the power of the transmission shaft is transmitted to the rotary shaft 3a through the chain.

  As shown in FIG. 10, the main body shield cover 4 is joined to the chain transmission case 17 and the end cover 18 at end plates 4a and 4a at both ends thereof, and is transmitted at a connecting member 4b protruding from the upper surface (outer peripheral surface). It is supported by both frames 15 and 16 by being joined to lower brackets 15a and 16a protruding below the frame 15 and the support frame 16.

  As shown in FIG. 1, a claw 3b such as a tilling claw protrudes from the outer periphery of the rotary shaft 3a at an appropriate interval in the circumferential direction, and the main body rotor 3 is constituted by the rotary shaft 3a and the claw 3b. The claws 3b are arranged at an interval that does not interfere with each other in the axial direction of the rotary shaft 3a. The claws 3b and 3b adjacent to each other in the axial direction of the rotary shaft 3a are arranged at an angle with respect to the center of the shaft, for example, and the tip of the claw 3b has a rotation locus indicated by a two-dot chain line in FIG. Draw.

  As shown in FIG. 1, the extension work machine 7 has an extension rotor 8 that rotates simultaneously with the main body rotor 3 when deployed, an extension shield cover 9 that covers the extension rotor 8, and end plates 9 a that are located on both sides of the extension shield cover 9 in the width direction. The end plate 9a is connected to the end plate 4a of the main body working machine 2 so that the end plate 9a can be unfolded and folded. For example, the extension work machine 7 is connected to the main work machine 2 so as to be rotatable around an axis inclined in the vertical direction with respect to the traveling direction.

  The extension rotor 8 of the extension work machine 7 receives power from the main body rotor 3 when the rotary shaft 8a is connected to the rotary shaft 3a of the main body rotor 3 of the main work machine 2 via a clutch during deployment. The extension rotor 8 includes a rotary shaft 8a connected to the rotary shaft 3a and a claw 8b protruding from the outer periphery thereof. In FIG. 1, the claw 8 b is indicated by a two-dot chain line as a rotation locus drawn by the tip portion.

  As shown in FIGS. 1 and 10, the extension work machine 7 is protruded at a position closer to the rear on the upper side of the end plate 4 a in the main work machine 2, with a bracket 9 b provided on the upper side of the end plate 9 a. By being connected to the bracket 4c by a pin 9c or a bolt as a rotation shaft, the bracket 4c is connected in a state where it can be expanded and retracted. The rotation axis composed of the pins 9c and the like is on the plane and faces the direction parallel to the traveling direction of the tractor 40, and the extension working machine 7 is placed on the rear side in the running direction of the main working machine 2 when the extension working machine 7 is folded. Is inclined to the front side (the tractor 40 side) with respect to the horizontal plane.

  As shown in FIG. 10, the extension work machine 7 is switched between the unfolded state and the retracted state by a switching cylinder 19 installed between the main body work machine 2 and the extension work machine 7. It is restrained by a restraint (locking) device that holds the state. In the drawing, the end of the switching cylinder 19 on the main body work machine 2 side is connected to the transmission frame 15 and the support frame 16, but the switching cylinder 19 is installed between the main body shield cover 4 and the extension shield cover 9. Sometimes.

  As shown in FIG. 2 which is a partially enlarged view of FIG. 10, the extension leveler 11 is linked to the swinging of the main body leveler 6 when the extension work machine 7 is connected to the main body working machine 2. An extension leveler linking member (hereinafter referred to as linking member) 20 that is rocked is installed.

  The linking member 20 has a locked portion 21 to which the extension leveler 11 and the main body leveler 6 are locked when the extension work machine 7 is connected to the main body work machine 2, and extends with the extension leveler 11 when the extension work machine 7 is folded. It has the latching | locking part 22 latched to the apron 10. FIG. When the extension leveler 11 receives an external force in any swinging direction when the extension work machine 7 is folded, the linkage member 20 rotates together with the extension leveler 11 in the direction in which the external force acts.

  Since the linking member 20 has a function of interlocking the extension leveler 11 with the swinging of the main body leveler 6, the linking member 20 is always swung or rotated with respect to the extension apron 10 simultaneously (integrally) with the extension leveler 11. The stop portion 21 and the locking portion 22 are always engaged with the extension leveler 11 in any swinging direction. As shown in FIG. 2, when the extension work machine 7 is connected to the main body work machine 2, the locked portion 21 of the linkage member 20 is locked to the side plate 6 a of the main body leveler 6 in at least one of the swing directions, or Engagement (hereinafter referred to as locking).

  A side plate (side plate 6a of the main body leveler 6) that closes the respective end portions of the main body apron 5 and the main body leveler 6 in the width direction is integrated. Side plates 10a and 11a for closing the ends of the main bodies are integrated with the ends in the width direction. As shown in FIGS. 2, 11-(a), (b), when the extension work machine 7 is connected to the main body work machine 2, the locked portion 21 of the linkage member 20 is at least on the side plate 6 a of the main body leveler 6. It is locked or engaged (hereinafter referred to as locking) in the swing direction.

  As shown in FIG. 11- (a), the locked portion 21 of the linking member 20 has an inner peripheral surface of a recess 6b formed on the surface of the side plate 6a of the main body leveler 6 on the side of the extension work machine 7, or FIG. As shown in (b), the surface of one side (upper or lower) of the convex portion 6c is locked or the like, and the concave portion 6b or the convex portion 6c is locked to the locked portion 21 to thereby The extension leveler 11 swings in conjunction with the swing. The recess 6b of the side plate 6a is formed, for example, by projecting a plate on the surface on the extension work machine 7 side to form a relative projection, or as shown in FIG. 11- (a). It is formed by forming a groove in.

  When a plate is projected on one side of the side plate 6a, when the plate projects above and below the portion corresponding to the recess 6b, the portion sandwiched between the upper and lower plates becomes the recess 6b, and the main body leveler 6 is positive or negative. Lock to the locked portion 21 in the (up and down) direction. As shown in FIG. 11- (b), when the plate protrudes only on one side of the portion corresponding to the concave portion 6b, the plate becomes the convex portion 6c, so that the upper surface or the lower surface of the convex portion 6c is engaged. The stopper 21 is locked upward or downward. When the extension leveler 11 is interlocked with the swing of the main body leveler 6 in the positive / negative (up and down) direction, the concave portion 6b is formed at the tip portion position of the locked portion 21, or the convex portion is above and below the tip portion position. 6c is formed.

  However, when the main body leveler 6 is restrained, for example, by the downward rotation and the downward rotation of the main body leveler 6 is restricted, the extension leveler 11 is moved to the upward rotation (swing) of the main body leveler 6. Since it only needs to be interlocked, as shown in FIG. 11- (b), it is only necessary to project a plate to be the convex portion 6c only below the locked portion 21 (the tip portion).

  As shown in FIGS. 2 and 10, the linking member 20 is installed on the upper surface of the extension leveler 11 when the extension work machine 7 is in the unfolded state, and is supported at one place or a plurality of places. The linking member 20 has a locked portion 21 on the main body leveler 6 side, and when the extension work machine 7 shifts from the folded state to the unfolded state by rotation around the bracket 4c and the pin 9c passing through the bracket 9b. The to-be-latched part 21 protrudes toward the main body leveler 6 side and engages with the above-described concave part 6b or convex part 6c.

  The extension leveler 11 is suspended from the connecting portion (the connecting shaft 10b) with the extension apron 10 as shown in FIGS. 1, 4, and 7, and the external force is lost while avoiding the external force from the flange 50 or the like. In the drawing, as shown by a two-dot chain line, it is set so that it can be rotated in the direction of jumping up due to a collision with the rod 50 and the like but is not rotated in the reverse direction. However, since the extension leveler 11 can be linked to the main body leveler 6 of the main body work machine 2 when the extension work machine 7 is connected to the main body work machine 2 if the state suspended from the connection portion can be maintained. It is not always necessary to be in a non-rotating state on the opposite side of the jumping direction.

  In FIG. 11 showing the details of the relationship between the extension leveler 11 and the extension apron 10, the extension leveler 11 does not rotate so that its upper surface overlaps the upper surface of the extension apron 10, but the lower surface of the extension leveler 11 is extended to the extension apron 10. It rotates by receiving an external force in a direction that overlaps the lower surface of. Accordingly, the linkage member 20 that rotates integrally with the extension leveler 11 relative to the extension apron 10 does not rotate upward in FIG. 11 but rotates downward.

  The extension work machine 7 is connected to the main work machine 2 by rotating around the pin 9c described above, and the connected state is released, so that the linking member 20 is extended in parallel to a plane perpendicular to the axis of the pin 9c. The apron 10 (the side plate 10a) and the extension leveler 11 (the side plate 11a) are supported by the extension leveler 11 so as to be movable in and out in a direction parallel to the connecting shaft 10b.

  Further, since the linkage member 20 is rotatable with the extension leveler 11 with respect to the extension apron 10, it is supported by the extension leveler 11 so as to be rotatable around an axis parallel to the connecting shaft 10b. The shaft portion 20a, which is the main body of, is formed in a round bar shape or a square bar shape. Accordingly, a part of the shaft portion 20a on the main body leveler 6 side is used as the locking portion 22, and a locked portion 21 parallel to the shaft portion 20a is formed by projecting from the surface of the shaft portion 20a. 7, the interlocking member 20 is in the shape of a hand so that the locking portion 22 is disengaged from the side plate 10 a of the extension apron 10 while the locked portion 21 is engaged with the side plate 6 a of the main body leveler 6. The shape is

  The shaft portion 20 a of the linkage member 20 is supported on the opposite side of the locking portion 22 so as to be movable in the axial direction of the extension leveler 11, that is, to be able to appear and retract. A support material 11c having an insertion hole through which the shaft portion 20a is inserted in the axial direction protrudes from the upper surface of the extension leveler 11, and the shaft portion 20a is supported by the support material 11c so as to be movable in the axial direction. As shown in FIG. 11, the locked portion 21 of the linking member 20 is inserted through the insertion hole 11 b formed in the side plate 11 a of the extension leveler 11 and locked to the concave portion 6 b or the convex portion 6 c of the main body leveler 6. Therefore, if the support member 11c is supported at one end of the shaft portion 20a, the linking member 20 is supported at two points. Therefore, it is not always necessary to support the end portion of the shaft portion 20a on the main body leveler 6 side. Absent.

  The linking member 20 is installed on the upper surface of the extension leveler 11 with the locked portion 21 and the locking portion 22 penetrating the side plate 10a through the insertion hole of the support member 11c at the end of the shaft portion 20a. A flange 20b is formed near the locking portion 22 of the shaft portion 20a. When the linkage member 2 is installed, a biasing member 20c such as a coil spring is compressed between the flange 20b and the support member 11c. The linking member 20 is urged toward the side plate 11a by the urging member 20c.

  When the extension work machine 7 is in the unfolded state, the tip of the locking portion 22 is engaged when the tip of the locked portion 21 is engaged with the concave portion 6b or the convex portion 6c while contacting the side plate 6a of the main body leveler 6. Is in a position separated from the side plate 10a of the extension apron 10. At this time, when the linking member 20 receives a reaction force from the side plate 6a toward the support member 11c, the main body leveler 6 and the locked portion 21 are securely engaged with each other, and the extended apron 10 (the recessed portion 10c) The extension leveler 11 released from the engagement is interlocked with the main body leveler 6 and can swing.

  Further, when the extension work machine 7 tries to shift from the folded state to the unfolded state, the locked portion 21 of the linkage member 20 is placed on the inner peripheral surface of the concave portion 6b of the side plate 6a of the main body leveler 6 or the surface of the convex portion 6c. By making contact (contact), the linking member 20 is once pushed to the support material 11c side and pulled. Thereafter, the linking member 20 protrudes toward the side plate 6a side of the main body leveler 6 by the restoring force of the urging member 20c, and the tip contacts the inner peripheral surface of the concave portion 6b or the surface of the convex portion 6c of the side plate 6a. Part) is engaged with the recess 6b or the protrusion 6c.

  The locked portion 21 of the linking member 20 penetrates the side plate 11a of the extension leveler 11 and reaches the side plate 6a of the main body leveler 6 at least when the extension work machine 7 is deployed. Since the 11a is penetrated, the locked portion 21 is always locked to the side plate 11a (extension leveler 11) in any direction.

  As will be described later, when the extension work machine 7 is folded, the locking portion 22 of the linkage member 20 also passes through the side plate 11a of the extension leveler 11 and is locked to the locking portion 24a of the interlocking member 24. The locking part 22 of the linking member 20 is locked to the locking part 24a of the interlocking member 24 when the extension leveler 11 is rotated in the direction of flip-up, thereby rotating the interlocking member 24 around the connecting shaft 10b.

  In addition, since the front-end | tip part of the latching | locking part 22 is supported by the side plate 11a in the state which can be protruded / projected from the side plate 11a to the main body leveler 6 side, As shown in FIGS. 2 and 6, in the drawings, the side plate 11a is connected to the side of the linking member 20 so that the side plate 11a can reliably support the locking portion 22 even if the front end portion of 22 is immersed in the side plate 11a. A hollow guide member 11d through which the locking portion 22 can be inserted is fixed to the surface. Since the locking portion 22 is always inserted through the guide member 11d fixed to the side plate 11a, the locking portion 22 is always locked to the side plate 11a (extension leveler 11) both vertically.

  In the drawing, the extension leveler 11 can be rotated in the direction of jumping up from the state of FIG. 1 but is not rotated in the reverse direction, so that the locking portion 22 of the linkage member 20 is attached to the side plate 10 a of the extension apron 10. The extension leveler 11 is not locked in the rotatable direction, but is locked in the non-rotatable direction.

  The front end of the locking portion 22 is locked to the side plate 10a of the extension apron 10 at a position slightly protruding from the side plate 11a to the main body leveler 6 side. The side plate 10a is formed with a locked portion 10c to which the locking portion 22 of the linkage member 20 is locked or engaged. In the state shown in FIG. 11, a certain amount of space (play) is secured between the case where the surface of the locking portion 22 is in contact with the locked portion 10c and the locking portion 22 and the locked portion 10c. There is a case.

  Therefore, when the extension leveler 11 tries to rotate upward from the state shown in FIG. 11, the locking portion 22 is locked to the locked portion 10c of the side plate 10a. When the leveler 11 tries to rotate downward, the linkage member 20 rotates together with the extension leveler 11 and the interlocking member 24, and the locking portion 22 is detached from the locked portion 10c of the side plate 10a.

  The side plate 11a of the extension leveler 11 is connected to the side plate 10a of the extension apron 10 by a connecting shaft 10b in a state of overlapping. Although the positional relationship between the side plates 11a and 10a is not particularly limited, in the drawing, in order to avoid interference between the side plate 11a and the main body leveler 6 including the side plate 6a, the side plate 11a of the extension leveler 11 is disposed on the main body leveler 6 side. The side plate 10a of the extended apron 10 is arranged, and bolts and pins that serve as the connecting shaft 10b are inserted through a range where the side plates 11a and 10a overlap.

  As shown in FIG. 11, the locking portion 22 of the linking member 20 passes through the guide member 11d projecting from the extension leveler 11, which is the installation position of the linking member 20, to the side plate 11a and the insertion hole of the side plate 11a continuous therewith. Then, the extended apron 10 is locked to the locked portion 10c formed on the side plate 11a side of the side plate 10a.

  The extension leveler 11 or its side plate 11a is urged directly or indirectly to the side where the extension leveler 11 can be interlocked with the main body leveler 6 as shown by a two-dot chain line in FIG. The urging member 23 constituting the restoring device 28 is installed to return the extended leveler 11 rotated by receiving external force to the suspended state indicated by the solid line. The state in which the extension leveler 11 can be interlocked with the main body leveler 6 is a state in which the extension leveler 11 is linked to the main body leveler 6 when the extension work machine 7 is connected to the main body work machine 2, so that the state is reached. The biasing member 23 always biases the extension leveler 11.

  Accordingly, in the drawing, an interlocking member 24 for effectively transmitting the restoring force from the urging member 23 to the extension leveler 11 is arranged on the side plate 10a of the side plate 10a of the extension apron 10, and the side plate 10a. Are supported (axially supported) so as to be rotatable (rotatable) around the connecting shaft 10b. In the case of FIG. 1, the restoring device 28 includes an urging member 23 and an interlocking member 24. Arranging the interlocking member 24 so as to overlap the surface of the side plate 10a on the main body leveler 6 side facilitates the arrangement without causing interference with other parts even when rotating around the connecting shaft 10b, and biasing It is because it is easy to receive the restoring force from the member 23, and to transmit to the side plate 10a (linking member 20) easily.

  As shown in FIG. 3, which is a partially enlarged view of FIG. 1, the interlocking member 24 is interposed between the biasing member 23 and the extension leveler 11, and the biasing member 23 is connected to the interlocking member 24. As shown in FIG. 12, when the restoring force from the urging member 23 is directly transmitted to the extension leveler 11, the side plate 11 a, or the linking member 20, the interlocking member 24 is not necessary.

  In FIG. 12, a coil spring as an urging member 23 is installed between a locked portion 21 of a link member 20 for an extended leveler and a locked portion 31 of a link member 30 for an extended apron 10 described later. When connected to. In this case, the urging member 23 is normally in a state of receiving a tensile force in the axial direction, and always pulls the locked portion 21 penetrating the side plate 11a of the extension leveler 11 toward the extension apron 10 (linking member 30). Then, the extension leveler 11 is urged in a direction to return to the suspended state.

  When the interlocking member 24 is pivotally supported in a state where it overlaps the surface of the side plate 10a, the interval is maintained so that the frictional force does not act between the side plate 10a and the interlocking member 24, or the frictional force is applied between the two. A low friction material such as a sheet of tetrafluoroethylene resin (PTFE) is interposed for reduction.

  As shown in the figure, when the interlocking member 24 is pivotally supported on the side plate 10a, the interlocking member 24 is locked or connected to the extension leveler 11 or the side plate 11a, for example, so that the biasing member 23 through the interlocking member 24 However, in the drawing, since the force from the interlocking member 24 is easily transmitted to the side plate 11a, the interlocking member 24 is connected to the locking portion 22 of the interlocking member 20. Is locked or engaged.

  In this case, the interlocking member 24 is given the role of returning the extended leveler 11 that has been flipped up by the rotation of the interlocking member 24 around the connecting shaft 10b to the suspended state indicated by the solid line, as indicated by the two-dot chain line in FIG. The interlocking member 24 is engaged with the extension leveler 11, the side plate 11 a, or the linkage member 20 so that the restoring force of the biasing member 23 acts in a direction to return the extension leveler 11.

  In the drawing, the interlocking member 24 is locked to the locking portion 22 of the linking member 20 in the return direction of the extension leveler 11, so that it corresponds to the locking portion 22 of the interlocking member 24 as shown in FIG. A locking portion 24a for returning the locking portion 22 to the original position (hanging position) is formed at the position. In FIG. 1, the interlocking member 24 has a shape having portions that can be locked to the locking portion 22 at both side positions of the locking portion 22, but the interlocking member 24 moves the locking portion 22 to the return of the extension leveler 11. Since it is only necessary to have the locking portion 24a that can be locked in the direction, a portion that can be locked to the locking portion 22 is not required in the reverse direction of the return direction.

  As the urging member 23, a torsion spring shown in FIGS. 1 to 3, a coil spring shown in FIGS. 4 to 9 or the like is mainly used. In the case of a torsion spring, the urging member 23 is used in a state where a torsional moment is applied in any direction around the axis in principle. In the case of a coil spring, it is used in a state where a compressive force is applied in the axial direction as shown in FIGS. 4 to 6, and in a state where a tensile force is applied as shown in FIGS. May be. In any case, the restoring force of the urging member 23 acts on the side plate 11a (extension leveler 11) in such a direction that the side plate 11a (linking member 20) is always returned to the suspended state by the rotation of the interlocking member 24 around the connecting shaft 10b. .

  1 to 3 show a combination example with the interlocking member 24 when the urging member 23 is a torsion spring, that is, a configuration example of the restoring device 28 as described above.

  As shown in FIG. 2, the extension apron 10 oscillates by linking the extension apron 10 with the swing of the main body apron 5 when the extension work machine 7 is connected to the main body work machine 2. An extension apron linking member (hereinafter referred to as linking member) 30 to be moved is installed. As shown in FIGS. 2, 5, and 8, the linking member 30 is used to connect or support any portion such as one end or an intermediate portion of the urging member 23, or as shown in FIGS. 4 to 9. It is used to support the connecting member 25 interposed between the biasing member 23 and the interlocking member 24.

  The form of the linkage member 30 and the relationship between it and the side plate 10a of the extension apron 10 are the same as the relationship between the linkage member 20 and the side plate 11a of the extension leveler 11, and the linkage member 30 is locked by the side plate 5a of the main body apron 5. Or a locked portion 31 to be engaged and a locking portion 32 to be locked or engaged with the side plate 10a of the extension apron 10. The locked portion 31 penetrates the side plate 10a of the extended apron 10 and contacts the side plate 5a of the main body apron 5, and the locking portion 32 is locked to the side plate 10a.

  In the case of FIGS. 1 to 3, one end of the urging member 23 is locked in a restoring direction to any part of the extended apron 10 or the extended shield cover 9, and the other end is restored to the connecting portion 24 b of the interlocking member 24. Lock in the direction. In FIG. 1 to FIG. 3, in order to support the shaft of the urging member 23 on the extended apron 10, the urging member 23 is attached to the locked portion 31 (shaft portion 30 a) of the linkage member 30 installed on the extended apron 10. The shaft is wound. Similar to the linking member 20, the linking member 30 is supported by the extended apron 10 at the shaft portion 30 a.

  In this case, the end of the urging member 23 on the side of the interlocking member 24 is in the direction in which the extension leveler 11 is returned from the state in which the extension leveler 11 is flipped up to the state in which it is suspended from the connecting shaft 10b of the extension apron 10. It locks or engages with the 24 connecting portions 24b.

  The interlocking member 24 is pivotally supported by the connecting shaft 10b like the extension leveler 11, and the extension portion 11 is returned to the suspended state when the locking portion 24a is locked to the extension leveler 11 or the linking member 20. The interlocking member 24 rotates around the connecting shaft 10b together with the extension leveler 11 at least in the returning direction of the extension leveler 11. At this time, since the interlocking member 24 tends to rotate around the connecting shaft 10b in a direction in which the connecting portion 24b approaches the main body side of the extended apron 10, the interlocking member 24 contacts the main body of the extended apron 10 at the upper end portion. To maintain the stop state.

  When the extension leveler 11 is in the state of being lifted as indicated by a two-dot chain line from the suspended state indicated by the solid line in FIGS. The direction in which the interlocking member 24 is separated from the extension apron 10 against the restoring force of the urging member 23 around the connecting shaft 10b when the portion 22 pushes the locking portion 24a of the interlocking member 24 in the upward direction. Rotate to. Due to the rotation of the interlocking member 24, the connecting portion 24 b rotates the end of the urging member 23 in the direction opposite to the restoration, and applies a restoring force to the urging member 23.

  The state in which the extension leveler 11 is flipped up is maintained as long as any part of the extension leveler 11 is in contact with the flange 50 or the like. When the contact with the hook 50 or the like is released, the restoring force of the urging member 23 tries to return the connecting portion 24b of the interlocking member 24 to the state before the jumping up (the suspended state of the extension leveler 11). Rotates to the return side. Along with this, the locking portion 24a of the interlocking member 24 rotates the locking portion 22 of the linkage member 20 around the connecting shaft 10b and pushes it toward the return side, and at the same time, the extension leveler 11 returns to the suspended state.

  In the case of the example shown in FIGS. 4 to 6 in which the biasing member 23 is in a normal state, that is, in the state where the axial level compression force is borne when the extension leveler 11 is in the suspended state, one end of the biasing member 23 is the extension apron. 10 or any part of the extended shield cover 9 is connected in a state of pressing in the restoring direction, and the other end is directly or indirectly pressed in a restoring direction to the connecting portion 24b of the interlocking member 24. Connected.

  When the urging member 23 bears an axial force, the urging member 23 is set so that the restoring force of the urging member 23 acts in a direction in which the interlocking member 24 is brought into contact with the main body of the extension apron 10. If it can be installed between the interlocking member 24 and the extended apron 10 or the extended shield cover 9, the other end of the urging member 23 is directly connected to the connecting portion 24b. However, for that purpose, it is necessary to orient the axis of the biasing member 23 in a direction close to the direction orthogonal to the main body of the extension apron 10, and it is difficult to secure a connecting place at one end of the biasing member 23. 4 and later, the connecting member 25 is interposed between the connecting portion 24 b of the interlocking member 24 and one end of the biasing member 23.

  4 to 6, the restoring device 28 is pivotally supported by the urging member 23 and the side plate 10a of the extension apron 10 by the connecting shaft 10b. In addition to the interlocking member 24 that rotates in the direction and receives the restoring force of the urging member 23 to return the extension leveler 11, the connecting member 25, and the connecting member 25 and the other end of the urging member 23 are connected in FIG. 5. The rotating member 26 and the shaft member 27 shown in FIG.

  For example, as shown in FIG. 5, one end of the urging member 23 is connected to an end of the extension apron 10 near the extension shield cover 9, and the other end is rotatably connected (axially supported) to the rotating member 26. The rotating member 26 is fixedly connected to one end of a shaft member 27 held by the shaft portion 30 a of the linkage member 30 and the side plate 10 a, and around the center of the shaft member 27 in a state integrated with the shaft member 27. Rotate. One end of the connecting member 25 is fixedly connected to the other end of the shaft member 27 protruding from the side plate 10a toward the main body apron 5, and the connecting member 25 is integrated with the shaft member 27 around the center of the shaft member 27. Rotate to.

  As shown in FIG. 6, an insertion hole is formed at the other end of the connecting member 25 so that the connecting portion 24 b of the interlocking member 24 can be moved in the length direction of the connecting member 25. The insertion hole through which the connecting portion 24b is inserted is formed in a long hole shape in the length direction of the connecting member 25 so that the connecting portion 24b can move in the length direction of the connecting member 25 as the connecting member 25 rotates. Yes.

  As shown in FIGS. 4 and 6, when the extension leveler 11 is suspended from the connecting shaft 10 b and is lifted up to the state indicated by the two-dot chain line by receiving external force from the flange 50 or the like, the extension leveler 11 penetrates the extension leveler 11. When the engaging portion 22 of the connecting member 20 presses the engaging portion 24a of the interlocking member 24 in the direction of lifting, the interlocking member 24 rotates around the connecting shaft 10b in a direction separating from the extension apron 10.

  As the interlocking member 24 rotates, the connecting shaft 24b moves along the elongated insertion hole of the connecting member 25, thereby rotating the connecting member 25 about (center) of the shaft member 27, and at the same time, the shaft member. The rotating member 26 integrated with the rotating member 27 rotates around the shaft member 27, and the urging member 23 contracts in the axial direction to retain a restoring force.

  When the external force acting on the extension leveler 11 disappears, the contracting biasing member 23 rotates to rotate the rotating member 26 around the shaft member 27 and simultaneously rotates the connecting member 25 around the shaft member 27. Let Since the connecting portion 24b of the interlocking member 24 inserted through the insertion hole by the rotation of the connecting member 25 tends to move to the extended apron 10 side, the interlocking member 24 rotates and contacts until the main body of the extended apron 10 contacts. And the extension leveler 11 returns to the suspended state.

  The biasing member 23 shown in FIGS. 7 to 9 is different only in that the biasing member 23 bearing the axial compressive force shown in FIGS. 4 to 6 is in a state bearing the axial tensile force. Therefore, the configuration of the restoration device 28 shown in FIGS. 7 to 9 is the same as that of the restoration device 28 shown in FIGS.

  7 to 9, the urging member 23 is always placed in a state of bearing an axial tensile force. Therefore, one end of the urging member 23 is connected to the extension leveler 11 side of the extension apron 10 as shown in FIG. . The other end of the urging member 23 is rotatably connected to a rotating member 26 that is fixedly connected to one end of the shaft member 27 as in the case of FIGS. One end of the connecting member 25 is fixedly connected to the other end of the shaft member 27 protruding from the side plate 10a toward the main body apron 5 side, and the rotating member 26 and the connecting member 25 are integrated with the shaft member 27. It rotates around the center of the shaft member 27.

  Similar to FIGS. 4 to 6, the other end of the connecting member 25 is formed with an elongated insertion hole through which the connecting portion 24 b of the interlocking member 24 is movably inserted, and the connecting portion 24 b is inserted into this insertion hole.

  7 to 9 also, when the extension leveler 11 is suspended from the connecting shaft 10b and is bounced up to the state indicated by the two-dot chain line by receiving external force from the flange 50 or the like, the extension leveler 11 penetrates the extension leveler 11. When the engaging portion 22 of the connecting member 20 presses the engaging portion 24a of the interlocking member 24 in the direction of lifting, the interlocking member 24 rotates around the connecting shaft 10b in a direction separating from the extension apron 10.

  As the interlocking member 24 rotates, the connecting shaft 24b moves along the elongated insertion hole of the connecting member 25, thereby rotating the connecting member 25 about (center) of the shaft member 27, and at the same time, the shaft member. The rotating member 26 integrated with the rotary member 27 rotates around the shaft member 27, and the urging member 23 extends in the axial direction to retain a restoring force.

  When the external force acting on the extension leveler 11 ceases, the extending biasing member 23 rotates to rotate the rotating member 26 around the shaft member 27 and simultaneously rotates the connecting member 25 around the shaft member 27. Let Since the connecting portion 24b of the interlocking member 24 inserted through the insertion hole by the rotation of the connecting member 25 tends to move to the extended apron 10 side, the interlocking member 24 rotates and contacts until the main body of the extended apron 10 contacts. And the extension leveler 11 returns to the suspended state.

1 ... folding machine,
2 ... Main body working machine,
3 ... Main body rotor, 3a ... Rotary shaft, 3b ... Nail,
4 ... Body shield cover, 4a ... End plate, 4b ... Connecting material, 4c ... Bracket,
5 …… Main body apron, 5a …… Side plate,
6 ... body leveler, 6a ... side plate, 6b ... concave, 6c ... convex,
7: Extension work machine,
8 ... Extension rotor, 8a ... Rotary shaft, 8b ... Claw,
9: Extension shield cover, 9a: End plate, 9b: Bracket, 9c: Pin,
10 ... Extension apron, 10a ... Side plate, 10b ... Connecting shaft, 10c ... Locked part,
11 ... Extension leveler, 11a ... Side plate, 11b ... Insertion hole, 11c ... Support material, 11d ... Guide member,
12 …… Top mast, 13 …… Lower link joint,
14 …… Gearbox,
15 ... Transmission frame, 15a ... Lower bracket,
16: Support frame, 16a: Lower bracket,
17 …… Chain transmission case, 18 …… End cover, 19 …… Cylinder for switching,
20 ... Linking member for extension leveler, 20a ... Shaft, 20b ... Flange, 20c ... Biasing member,
21 …… Locked part, 22 …… Locking part,
23 …… Biasing member, 24 …… Interlocking member, 24a …… Locking portion, 24b …… Connecting portion,
25 …… Connecting member, 26 …… Rotating member, 27 …… Shaft member,
28 …… Restoration device,
30 …… Linking member for extension apron, 30a …… Shaft,
31: Locked portion, 32: Locking portion,
40 …… Tractor,
50 …… 畦.

Claims (4)

A main body working machine having a main body apron which is connected to the rear part of the tractor and covers the main body rotor driven by power from the tractor, and a main body leveler which is positioned behind the main body apron and can swing around an axis parallel to the main body rotor. An extension apron that covers the extension rotor connectable to the main body rotor of the main body working machine, and an extension leveler that is positioned behind the extension apron and is swingable about an axis parallel to the extension rotor. With an extension work machine that can be folded with respect to the machine,
When the extension work machine is connected to the main body work machine, the extension leveler swings in conjunction with the main body leveler swinging,
In the folding work machine that is rotatable with respect to the extension apron when the extension work machine is in a folded state and the extension leveler receives an external force,
A device for restoring an extension leveler in a folding working machine, comprising a biasing member that biases the extension leveler directly or indirectly to a side where the extension leveler can be interlocked with the main body leveler. .   The restoration device for an extension leveler in a folding working machine according to claim 1, wherein the restoring force of the urging member is always applied to the extension leveler.   The interlocking member that rotates in conjunction with the swing of the extension leveler is supported by the extension apron, and the biasing member is connected to the interlocking member. The restoration device of the extension leveler in the folding work machine as described in 2. The extension leveler is provided with a linkage member that swings the extension leveler in conjunction with the swing of the main body leveler when the extension work machine is connected to the main body working machine. 4. The restoration device for an extension leveler in a folding work machine according to claim 3, wherein the member is engaged with the member when the extension work machine is in a folded state.

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