JP2016113041A - Connection tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection tool capable of easily detachably attaching a carriage for smoothly conveying the carriage using a traction vehicle.SOLUTION: A connection tool 30 is provided at the back face side of a traction vehicle 10. The connection tool 30 comprises the first and second connection arms 31, 32 and the first and second suppression members 33, 34. The first and second connection arms 31, 32 are provided turnably to the traction vehicle 10 on the positions separate from each other, and the tops of the connection arms are detachably installed to the columnar supports 20a of the carriage 20. The first and second suppression members 33, 34 extend to the directions different from the extending directions of the connection arms 31, 32, and the tops of the suppression members are installed to the connection arms 31, 32, respectively.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a connector for connecting a truck and a tow vehicle.

  An automatic conveyance system has been developed for labor saving of material and material conveyance work at a construction site and efficiency of physical distribution (for example, see Non-Patent Document 1). In the technique described in Non-Patent Document 1, materials and equipment placed on a table are transshipped into a submersible cart. And this cart is made to run on the magnetic tape affixed on the ground, and is conveyed to the destination. In addition, using a tow vehicle that is self-propelled, a cart carrying materials and equipment is transported to a destination.

Obayashi, “Developing and applying an“ automatic transport system ”that saves the transportation of materials and equipment at construction sites”, [online], [searched on November 5, 2014], Internet, <URL: http: // www .obayashi.co.jp / news / news_20130626_1>

  When towing a cart on which materials and equipment are placed, the cart is connected to the towing vehicle and the towing vehicle is allowed to self-run. In this case, two connecting portions provided behind the towing vehicle may be used. This connection part is spaced apart and is attached to the tow vehicle so that rotation in a horizontal surface is possible.

  However, when the two connecting portions are rotatably attached to the towing vehicle and transported, a lateral shake may occur on the left and right sides of the carriage due to the unevenness of the traveling surface, and this shake may increase. In particular, it was difficult to carry smoothly when running on a curve.

  This invention is made | formed in view of the said subject, and it is providing the connector for detaching | removing a trolley easily and conveying a trolley smoothly using a tow vehicle.

  A connector that solves the above-described problem is a connector for connecting a carriage to a tow vehicle. The first and second connection arms that can be attached to and detached from the carriage, and the first connection arm around a vertical axis. A first attachment member that is attached to the tow vehicle so as to be pivotable, a second attachment member that is attached to the tow vehicle so as to be pivotable about a vertical axis, and the first connection arm. And the second connecting arm, and extends in a direction different from the extending direction of the first connecting arm and the second connecting arm, and the first connecting arm and the second connecting arm. And a restraining member that suppresses the displacement of the positional relationship between the two connecting arms. Thereby, since the suppression member suppresses the displacement of the positional relationship between the first and second connecting arms, it is possible to suppress the left and right runout of the carriage caused by the unevenness or the curve of the traveling surface. Therefore, the cart can be smoothly transported even when the first and second connecting arms rotate.

  In the connector, the first end of the restraining member is fixed to the first connecting arm, and the first restraining member restrains the displacement of the positional relationship of the first connecting arm, and the second connecting arm. And a second restraining member that restrains the positional displacement of the second connecting arm. Thereby, since the displacement with respect to each of a 1st connection arm and a 2nd connection arm can be suppressed by using a 1st suppression member and a 2nd suppression member, the left-right deflection of a trolley | bogie can be efficiently performed. Can be suppressed.

  In the connector, it is preferable that the first suppression member and the second suppression member are arranged so as to be line-symmetric with respect to the traveling direction of the tow vehicle. Thereby, based on the balance of the force in the lateral direction with respect to the traveling direction of the tow vehicle, it is possible to efficiently suppress the lateral deflection of the first and second connecting arms.

  In the connector, it is preferable that the first and second restraining members are attached to the towing vehicle so as to be rotatable around the same vertical axis at the base end portion. Thereby, the attachment part of the 1st and 2nd suppression member can be made common by attaching one vertical axis | shaft.

  In the connector, the first connecting arm, the second connecting arm, and the restraining member are rotatable about a horizontal axis so that the extending direction thereof is from a horizontal plane to a vertical plane. It is preferable to be attached to the tow vehicle. Thereby, when not using a connection tool, it can be stored in the state where the connection tool stood up on the side of a towing vehicle.

  In the connector, it is preferable that the suppressing member includes an air cylinder, and displacement of the positional relationship between the first connecting arm and the second connecting arm is suppressed by air pressure in the air cylinder. Thereby, a damping force can be given to each of the 1st and 2nd connection arms, and displacement can be controlled efficiently. In addition, the carriage can be efficiently connected by expanding and contracting the piston rod of the air cylinder.

  ADVANTAGE OF THE INVENTION According to this invention, a trolley | bogie can be smoothly conveyed using a tow vehicle.

It is explanatory drawing explaining the relationship between the tow vehicle in embodiment, a trolley | bogie, and the coupling tool which connects these, (a) is a schematic top view, (b) is a schematic side view. The enlarged plan view of the coupling tool in embodiment. The back perspective view of the important section of the connecting implement in an embodiment. The expansion perspective view of the principal part of the connector in an embodiment. The schematic side view explaining rotation around the horizontal axis of the connector in an embodiment. It is explanatory drawing at the time of attaching the coupling tool in embodiment to a trolley | bogie, (a) is a top view in the case of attaching to a trolley narrower than a tow vehicle, (b) is the case of attaching a trolley wider than a tow vehicle FIG. Explanatory drawing explaining the operation | movement procedure in the case of conveying a trolley | bogie using the coupling tool in embodiment.

Hereinafter, the embodiment which actualized the connector for connecting the tow vehicle which pulls a trolley | bogie and a trolley | bogie using FIGS. 1-7 is demonstrated.
First, the tow vehicle 10 of this embodiment is demonstrated using FIG.
FIG. 1A is a schematic top view in a state where a truck 20 is connected to a tow vehicle 10, and FIG. 1B is a schematic side view thereof. As shown in FIG. 1, in the present embodiment, a connector 30 is attached to the rear side of the tow vehicle 10 (the rear side in the traveling direction of the tow vehicle 10). The tow vehicle 10 is self-propelled while towing the connected cart 20.

The tow vehicle 10 includes a main body having a substantially rectangular parallelepiped shape and four wheels. Each wheel is provided at the lower end of each corner of the main body. The main body is provided with a traveling mechanism such as a wheel for self-propelling and a drive mechanism for controlling the traveling mechanism. Furthermore, a pneumatic system or the like is provided in the main body. The pneumatic system is a system for supplying air pressure to an air cylinder of the connector 30 described later, and includes a compressor, a solenoid valve, and the like.
Bumpers 15 are fixed on the front side and the back side of the main body. The outside of the bumper 15 (the front side is the front side bumper 15 and the back side is the back side bumper 15) is made of, for example, a rubber material.

  The tow vehicle 10 includes a control unit 11. An operation unit (not shown) is connected to the control unit 11. The control unit 11 includes a detection unit that detects the position and shape of the magnetic tape attached to the ground. And the control part 11 controls a drive mechanism. Specifically, the control unit 11 travels on the magnetic tape while specifying the position and mark of the magnetic tape by the detection unit. And it controls to stop on the mark which shows a stop. Further, the control unit 11 controls the solenoid valve of the pneumatic system to lock and unlock the air cylinder of the connector 30.

Next, the cart 20 of this embodiment will be described.
The carriage 20 includes a rectangular plate-shaped member, four wheels, and four columns 20a. Each wheel of the carriage 20 is disposed below each corner of the plate member. Moreover, each support | pillar 20a of the trolley | bogie 20 is arrange | positioned on each corner | angular part of a plate-shaped member.

Next, the structure of the coupler 30 of this embodiment is demonstrated using FIGS.
As shown in FIG. 2, the connector 30 is attached to the towing vehicle 10 at a position above the bumper 15 on the back side. The connection tool 30 includes connection arms 31 and 32 connected to the carriage, restraining members 33 and 34, and rotation attachment portions 35, 36, and 37. In the connection tool 30 of the present embodiment, the first connection arm 31 and the second connection arm 32, and the first suppression member 33 and the second suppression member 34 are line-symmetric with respect to the traveling direction of the tow vehicle 10. It is comprised by the arrangement which becomes. Here, the rotation attachment portions 35 and 36 function as a first attachment member and a second attachment member.

  The two connecting arms 31 and 32 are disposed in the vicinity of both end portions on the back side of the tow vehicle 10. In this embodiment, the case where the 1st connection arm 31 and the 2nd connection arm 32 are spaced apart by the space | interval T0 is assumed.

  Each of the connecting arms 31 and 32 is attached to the towing vehicle 10 via rotation attachment portions 35 and 36, respectively. The rotation attachment portions 35 and 36 rotate about the horizontal axis and the vertical axis. Specifically, as shown in FIG. 5, the rotation attachment portions 35 and 36 rotate the connection arms 31 and 32 in the direction of the arrow Rh around the axis extending in the horizontal direction (horizontal axis). In this case, each of the connecting arms 31 and 32 can be rotated in a range of about 90 degrees so as to extend from the horizontal direction to the vertical direction. Further, as shown in FIG. 2, the rotation attachment portions 35 and 36 rotate the connection arms 31 and 32 in the directions of arrows R1 and R2 around the axis extending in the vertical direction (vertical axis). In this case, the vehicle can be rotated within a range of about ± 90 degrees (total of about 180 degrees) with respect to the traveling direction of the tow vehicle 10.

  As shown in FIG. 2, each connection arm 31 and 32 is provided with air cylinders 31a and 32a, respectively. Each of the air cylinders 31a and 32a is a double-acting single rod type, and the piston rod is disposed so as to be positioned on the cart 20 side. In the present embodiment, the air cylinders 31a and 32a are controlled by controlling the solenoid valve of the pneumatic system of the tow vehicle 10. Specifically, the air in each of the air cylinders 31a and 32a is controlled according to the opening and closing of the respective solenoid valves. When the solenoid valve is opened, air can flow in or out (in / out) into the air cylinders 31a and 32a, and the piston rods of the air cylinders 31a and 32a can be expanded and contracted. When the solenoid valve is closed, the flow of air into and out of the air cylinders 31a and 32a is stopped, and the length of the protruding portion of the piston rod of each air cylinder 31a and 32a is locked.

  Grip portions 31b and 32b are fixed to the tips of the piston rods of the air cylinders 31a and 32a. Each grip part 31b, 32b is provided with a mechanism that can be attached to and detached from the column 20a of the carriage 20. Specifically, each of the gripping portions 31b and 32b includes a distal end portion having a substantially C-shaped planar shape that is open on the outside and a lock mechanism.

  Furthermore, the diameter of the air cylinder 31a, 32a side at the tip of each gripping portion 31b, 32b can be increased. The locking mechanism of each gripping part 31b, 32b locks the diameter expansion operation of the tip part of the gripping part 31b, 32b. Thereby, when attaching the holding parts 31b and 32b to the support | pillar 20a of the trolley | bogie 20, the diameter of the front-end | tip part of the holding parts 31b and 32b is expanded, and a locking mechanism is operated. Moreover, when removing to the support | pillar 20a of the trolley | bogie 20, the lock mechanism of the holding parts 31b and 32b is cancelled | released, and a front-end | tip part is expanded in diameter.

  The first and second restraining members 33 and 34 are attached to the rear portion of the tow vehicle 10 via a rotation attachment portion 37. The rotation attachment portion 37 is disposed at the center position of the rotation attachment portions 35 and 36. Similar to the rotation attachment portions 35 and 36, the rotation attachment portion 37 has a mechanism for rotating the suppression members 33 and 34 around the horizontal direction and the vertical direction.

  Specifically, as shown in FIG. 3, the base end portions of the first and second suppressing members 33 and 34 are U-shaped. The rotation attachment portion 37 has a base end portion of the first suppression member 33 attached to one vertical axis and a base end portion of the second suppression member 34 on the outside thereof. Accordingly, the base end portions of the first and second restraining members 33 and 34 are attached to the towing vehicle 10 via the single rotation attachment portion 37 so as to be rotatable around the vertical axis. Further, like the rotational mounting portions 35 and 36, the rotational mounting portion 37 is arranged around the horizontal axis so that the first and second restraining members 33 and 34 extend from the horizontal direction to the vertical direction. Can be rotated.

  The first and second restraining members 33 and 34 include air cylinders 33a and 34a, respectively. Each air cylinder 33a, 34a has the same configuration as the air cylinders 31a, 32a of the connecting arms 31, 32. Specifically, each air cylinder 33a, 34a expands and contracts the piston rod in accordance with the opening and closing of the electromagnetic valve of the pneumatic system of the tow vehicle 10, and locks the length of the protruding portion of the piston rod.

  FIG. 4 is an enlarged perspective view of the distal end portion 34 b of the suppressing member 34. The tip 34b is U-shaped. And the front-end | tip part 34b is being fixed by bolting in the state which pinched | interposed the front-end | tip part of the air cylinder 32a of the 2nd connection arm 32. As shown in FIG. In addition, since the front-end | tip part 33b of the suppression member 33 is the structure reversed right and left with the front-end | tip part 34b of the suppression member 34, description of the front-end | tip part 33b is abbreviate | omitted.

  Next, the usage method of the tow vehicle 10 provided with the coupler 30 of this embodiment is demonstrated using FIG. 6, FIG. In this embodiment, the case where materials are conveyed with the trolley | bogie 20 in a construction site is assumed. In this case, a magnetic tape is affixed on the route on which the tow vehicle 10 travels, and a mark indicating each stop position such as an end point or a start point that becomes a conveyance destination is affixed.

  Then, as shown in FIG. 7, a truck mounting process is executed (step S1). Specifically, the connecting tool 30 of the tow vehicle 10 is attached to a carriage on which materials to be conveyed are placed. In this case, the electromagnetic valve of the tow vehicle 10 is opened, and the connection arms 31 and 32 of the connection tool 30 are freely movable. Then, the worker attaches the connection arms 31 and 32 of the connection tool 30 to the two support columns 20a in front of the carriage 20 (close to the towing vehicle 10).

  FIG. 6A shows a case where the distance D1 between the columns 21a of the carriage 21 is narrower than the distance T0 between the connection arms 31 and 32 of the connector 30 (T0> D1). In this case, the connecting arms 31 and 32 are rotated inward, and the gripping portions 31b and 32b of the connecting arms 31 and 32 are respectively attached and fixed to the support columns 21a. In this case, the restraining members 33 and 34 whose tip portions are attached to the connecting arms 31 and 32 contract.

  FIG. 6B shows a case where the distance D2 between the columns 22a of the carriage 22 is wider than the distance T0 between the connecting arms 31 and 32 of the connector 30 (T0 <D2). In this case, the connecting arms 31 and 32 are rotated outward, and the gripping portions 31b and 32b of the connecting arms 31 and 32 are respectively attached and fixed to the support columns 22a. In this case, the restraining members 33 and 34 whose tip portions are attached to the connecting arms 31 and 32 extend.

  In this way, when the attachment of the carriage is completed, the conveyance instruction process is executed (step S2). Specifically, the operator operates the operation unit of the tow vehicle 10 and inputs a destination and a conveyance instruction.

When the conveyance instruction is input, the control unit 11 of the tow vehicle 10 executes an automatic conveyance process (step S3).
In this automatic transfer process (step S3), first, the tow vehicle 10 executes a lock process for the connecting arm / suppressing member (step S3-1). Specifically, the control unit 11 of the tow vehicle 10 closes the electromagnetic valve. In this case, the inflow and outflow of air in the air cylinders 31a, 32a, 33a, 34a of the connecting arms 31, 32 and the restraining members 33, 34 are stopped, and the length of the protruding portion of the piston rod is locked.

  And the tow vehicle 10 performs the traveling process according to the guide (step S3-2). Specifically, the control unit 11 of the towing vehicle 10 controls the drive mechanism while detecting the magnetic tape, and travels on the magnetic tape to the destination.

  And the tow vehicle 10 performs the determination process of whether it arrived at the destination (step S3-3). Specifically, when the control unit 11 of the tow vehicle 10 detects a mark indicating a stop position on the magnetic tape, it determines that the destination has arrived.

  If it is determined that the vehicle has not arrived at the destination (“NO” in step S3-3), the control unit 11 of the tow vehicle 10 continues the traveling process (step S3-2) according to the guide. To do.

  On the other hand, when the mark indicating the stop position is detected and it is determined that the vehicle has arrived at the destination ("YES" in step S3-3), the control unit 11 of the tow vehicle 10 executes a movement stop process (step S3-4). Specifically, the control unit 11 controls the drive mechanism to stop traveling.

When the tow vehicle 10 stops, the control part 11 of the tow vehicle 10 performs a lock release process (step S3-5). Specifically, the control unit 11 opens the electromagnetic valve. As a result, air can flow into and out of the air cylinders 31a, 32a, 33a, 34a of the connecting arms 31, 32 and the restraining members 33, 34. Thus, the automatic conveyance process is completed.
And the removal process of a trolley | bogie is performed (step S4). In this case, the operator removes the connection arms 31 and 32 of the connection tool 30 from the support column 20a of the carriage 20 respectively.

According to the connector 30 of the present embodiment, the following effects can be obtained.
(1) In this embodiment, the connector 30 is provided on the back side of the tow vehicle 10. The connector 30 includes first and second connecting arms 31 and 32 and first and second suppressing members 33 and 34. The first and second connecting arms 31 and 32 are provided on the towing vehicle 10 so as to be rotatable at spaced positions, and their tips are detachably attached to the column 20 a of the carriage 20. The first and second restraining members 33, 34 extend in a direction different from the extending direction of the connection arms 31, 32, and the tip portions 33 b, 34 b are attached to the connection arms 31, 32, respectively. Thereby, the 1st and 2nd suppression members 33 and 34 can suppress the displacement of the positional relationship of the 1st and 2nd connection arms 31 and 32. FIG. For this reason, it is possible to suppress the left and right runout of the carriage 20 that occurs in the unevenness or curve of the traveling surface by the damping force of the first and second suppression members 33 and 34. Therefore, even when the first and second connecting arms 31 and 32 rotate, the carriage 20 can be smoothly conveyed.

  (2) In the present embodiment, the first and second suppression members 33 and 34 are arranged so as to be line symmetric with respect to the traveling direction of the tow vehicle 10. Thereby, based on the balance of the force in the lateral direction (direction orthogonal to the traveling direction) of the tow vehicle 10, it is possible to efficiently suppress the left and right swings of the first and second connecting arms 31 and 32.

  (3) In the present embodiment, the first and second restraining members 33 and 34 are attached to the towing vehicle 10 via the rotation attaching portion 37. Thereby, the attachment part of the 1st and 2nd suppression members 33 and 34 can be made shared.

  (4) In the present embodiment, the rotation attachment portions 35, 36, and 37 of the connector 30 are capable of rotating about the horizontal axis, and the first and second connection arms 31, 32 and the first and second. The restraining members 33 and 34 are attached to the towing vehicle 10. Thereby, when the connecting tool 30 is not used, the connecting tool 30 can be stored upright on the side surface of the tow vehicle 10.

  (5) In this embodiment, the 1st and 2nd suppression members 33 and 34 are provided with air cylinders 33a and 34a. Accordingly, the first and second suppression members 33 and 34 can apply a damping force to the first and second connection arms 31 and 32 by the air pressure in the air cylinders 33a and 34a.

  (6) In this embodiment, the 1st and 2nd connection arms 31 and 32 are provided with air cylinders 31a and 32a. For this reason, a damping force can be applied to the first and second connecting arms 31 and 32 by the air pressure in the air cylinders 31a and 32a. Further, by opening the electromagnetic valve, the piston rods of the air cylinders 31a and 32a can be expanded and contracted, and the carriage 20 can be efficiently connected.

Moreover, you may change the said embodiment as follows.
In the above embodiment, the first and second restraining members 33 and 34 of the connector 30 are attached to the towing vehicle 10 via the rotation attaching portion 37. The attachment positions and configurations of the first and second suppression members 33 and 34 are not limited to this. For example, you may attach the 1st and 2nd suppression members 33 and 34 to the tow vehicle 10 via the separate rotation attachment part. Further, the base ends of the air cylinders 33a and 34a of the first and second restraining members 33 and 34 are connected so that the distal ends thereof are not attached so that the first and second restraining members 33 and 34 intersect each other. You may make it attach to the base end part of the arms 32 and 31. FIG. In this case, the first and second suppressing members 33 and 34 are arranged so as to cross each other while being shifted in the height direction.

  -In above-mentioned embodiment, although the connector 30 provided the two (1st and 2nd) suppression member, a structure by one suppression member may be sufficient. In this case, the suppressing member is bridged over the first and second connecting arms 31 and 32, and both ends are fixed to the first and second connecting arms 31 and 32. Here, the suppressing member may be in a direction different from the extending direction of the first and second connecting arms. For example, you may arrange | position so that it may orthogonally cross with respect to the advancing direction of a 1st and 2nd connection arm or a tow vehicle, and may arrange | position diagonally.

  In the above-described embodiment, the first and second restraining members 33 and 34 of the connector 30 and the first and second connecting arms 31 and 32 are substantially the same in the horizontal plane. The arms 31 and 32 are arranged so as to extend in a direction different from the extending direction. You may make it arrange | position the 1st and 2nd suppression members 33 and 34 with a height difference with respect to the 1st and 2nd connection arms 31 and 32, respectively. In this case, since the vertical swing of the carriage can be suppressed, the carriage can be smoothly run even when the carriage travels in a place with a height difference such as a slope.

  In the above embodiment, the first and second connecting arms 31, 32 and the first and second restraining members 33, 34 are provided with air cylinders 31a, 32a, 33a, 34a, respectively. The first and second connecting arms 31 and 32 can be fixed while the distance between the towing vehicle 10 and the carriage 20 (21, 22) is traveling, and other locking mechanisms or the like can be used as long as these can be easily attached and detached. A configuration using may be used. The first and second restraining members 33 and 34 extend in a direction different from the extending direction of the first and second connection arms 31 and 32, and the first and second connection arms 31 and 32. As long as the structure can suppress the displacement of the positional relationship and apply the damping force, the structure is not limited to the structure using the air cylinders 33a and 34a.

  In the above embodiment, the connector 30 is attached to the towing vehicle 10 via the rotation attachment portions 35, 36, and 37. The connector 30 may be configured to be detachable from the tow vehicle 10. In this case, a detachable and rotatable attachment member is used instead of the rotation attachment portions 35, 36, and 37 fixed to the towing vehicle 10. For example, a ring-shaped engagement portion is provided at a portion where the rotation attachment portions 35, 36, and 37 on the back side of the tow vehicle 10 are attached. In addition, the connector 30 is provided with a hooking portion instead of the rotation attachment portions 35, 36, and 37. In use, the hook portion of the connector 30 is detachably attached to the engaging portion on the back side of the tow vehicle 10. Thereby, when the connecting tool 30 is not used, it can be removed from the tow vehicle 10. Further, the connector 30 can be applied to, for example, another tow vehicle 10 having a different hook interval.

  In the connection tool 30 of the above embodiment, the tips of the first and second connection arms 31 and 32 are attached to the column 20 a of the carriage 20. The position where the connector 30 is attached is not limited to the column 20a of the carriage 20. For example, in the case of a cart without a column, it may be attached so as to grip a plate-like member provided with wheels. Alternatively, holes may be formed in the corners of the plate-like member on the side of the towing vehicle 10, and the tips of the first and second connecting arms 31, 32 may be attached to these holes.

  DESCRIPTION OF SYMBOLS 10 ... Towing vehicle, 11 ... Control part, 15 ... Bumper, 20, 21, 22 ... Cart, 20a, 21a, 22a ... Strut, 30 ... Connection tool, 31 ... First connection arm, 31a, 32a, 33a, 34a ... Air cylinder, 31b, 32b ... Holding part, 32 ... Second connecting arm, 33 ... First restraining member, 33b, 34b ... Tip, 34 ... Second restraining member, 35, 36, 37 ... Rotation Mounting part.

Claims (6)

A connector for connecting a truck to a tow vehicle,
First and second connecting arms detachably attached to the carriage;
A first attachment member for attaching the first connecting arm to the towing vehicle so as to be rotatable about a vertical axis;
A second attachment member for attaching the second connecting arm to the towing vehicle so as to be rotatable about a vertical axis;
The first connection arm and the second connection arm are disposed between the first connection arm and the second connection arm, and extend in a direction different from an extending direction of the first connection arm and the second connection arm. And a suppressing member that suppresses displacement of the positional relationship between the second connecting arm and the second connecting arm. The suppression member is
A first restraining member having a tip fixed to the first coupling arm and restraining displacement of the positional relationship of the first coupling arm;
The connector according to claim 1, further comprising: a second restraining member having a distal end fixed to the second coupling arm and restraining displacement of the positional relationship of the second coupling arm.   The connector according to claim 2, wherein the first restraining member and the second restraining member are arranged so as to be line-symmetric with respect to the traveling direction of the tow vehicle.   4. The coupling device according to claim 3, wherein the first and second restraining members are attached to the towing vehicle so as to be rotatable about the same vertical axis at a base end portion. 5. .   The first connecting arm, the second connecting arm, and the restraining member are attached to the towing vehicle so as to be rotatable about a horizontal axis so that the extending direction thereof extends from a horizontal plane to a vertical plane. The connector according to any one of claims 1 to 4, wherein the connector is provided.   The said suppression member is provided with the air cylinder, The displacement of the positional relationship of a said 1st connection arm and a said 2nd connection arm is suppressed with the air pressure in an air cylinder, The 1st-5 characterized by the above-mentioned. The connector according to any one of the above.

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