JP5882067B2 - Trolley coupling device - Google Patents

Description

  The present invention relates to a truck connecting device used in a factory production line or the like.

Conventionally, various carts have been used in factory production lines and the like. For example, there are trolleys connected to one or more towing vehicles driven by an operator, trolleys that are moved by being pushed directly by an operator, and various parts and finished products are carried by the trolley. .
In particular, in a production line such as a factory, a plurality of carts are often used connected in front and back, and various cart connecting devices have been proposed.
As an example of the coupling device, for example, the conventional cart coupling device shown in the schematic diagrams of FIGS. 6A and 6B includes a coupling arm portion 130 provided on one cart and projecting toward the other cart, A guide portion 170 provided on the other carriage and having an upper surface 171 and a lower surface 172, and a lock pin 174, are configured. In the related art, the lock pin is formed so as to penetrate the upper surface through hole 171A provided in the upper surface 171, the lower surface through hole 172A provided in the lower surface 172, and the arm side through hole 130H provided in the connecting arm portion 130. 174 is inserted and the connected state is locked.
Further, for example, in the prior art described in Patent Document 1, a hammerhead-shaped connecting shaft that is provided on one carriage and protrudes toward the other carriage, and a guide portion that is provided on the other carriage and has a long hole. And the coupling device of the trolley | bogie comprised by these is disclosed. In the related art, the connecting shaft of one cart is inserted into the elongated hole of the guide portion of the other cart, and the connected shaft is rotated 90 degrees to lock the connected state.
Further, for example, in the prior art described in Patent Document 2, a locking portion provided at the tip of an arm that is provided on one carriage and can be moved up and down, and a V-shape provided on the other carriage. A guide arm portion having a shape and a connecting device between a transport vehicle and a tow cart configured by the guide arm portion are disclosed. In the related art, after the locking portion is lifted and moved above the pin groove of the guide arm portion, the locking portion is lowered and locked in the pin groove, and the detent means provided in the pin groove is used. The locking part is locked.

JP 2008-189064 A JP 2007-276580 A

6 (A) and 6 (B), when connecting one cart and the other cart, the operator removes the lock pin 174, and inserts the connecting arm portion 130 into the guide portion 170. Thus, it is necessary to perform three operations, that is, the operation of moving the carriage and the operation of inserting the lock pin 174, and the work efficiency is not good in a factory production line or the like that is trying to shorten the operation time even by 1 second.
Further, in the prior art described in Patent Document 1, when one cart and the other cart are connected, the operator moves the cart so that the connecting shaft is inserted into the elongated hole of the guide, and rotates the connecting shaft. It is necessary to perform two operations, that is, the operation efficiency is not good. Moreover, the structure which rotates a connection shaft is required and a connection apparatus becomes complicated.
Further, in the prior art described in Patent Document 2, when one cart is connected to the other cart, the operator moves the cart so that the latching portion is located above the pin groove. It is necessary to perform four operations, that is, the operation of lowering the engaging portion, the operation of lowering the engaging portion, and the operation of moving the carriage to lock the engaging portion, and the work efficiency is not good. Further, the connecting device is complicated, such as a device for raising and lowering the locking portion and a detent means around the pin groove for locking.
The present invention was devised in view of such points, and provides a dolly connecting apparatus that can more efficiently connect one dolly and the other dolly with a simpler structure. Let it be an issue.

In order to solve the above-described problems, the cart connecting apparatus according to the present invention takes the following means.
First, the first invention of the present invention is a truck connecting device for connecting one cart and the other cart in the front-rear direction, wherein the connecting device is provided on one cart and projects toward the other cart. The connecting arm portion includes a guide portion provided on the other carriage and into which the connecting arm portion is inserted, and a lock pin that locks the connecting state between the connecting arm portion and the guide portion.
And the arm side through-hole penetrated in the perpendicular direction is provided in the front-end | tip part of the protrusion direction in the said connection arm part, The said lock pin becomes a position higher than the said connection arm part in the said guide part. When the connecting arm portion is inserted, the guide portion automatically inserts the lock pin arranged at the standby position into the arm side through hole of the inserted connecting arm portion. It has a connected auto-lock mechanism that allows it to drop.
In addition, the guide portion includes a guide upper portion provided to be positioned above the inserted connection arm portion, a guide lower portion provided to be positioned below the inserted connection arm portion, A pin support portion that is disposed between the guide upper portion and the guide lower portion and constitutes the connection auto-lock mechanism, and the guide upper portion guides the vertical movement of the lock pin in the guide upper portion. A through-hole is provided, and a pivot shaft member extending in the left-right direction is provided at a position on the guide upper portion that is closer to the coupling partner cart than the guide-side through-hole, and the pin support portion is The pin support portion is provided between the guide upper portion and the guide lower portion so as to cross a virtual axis passing through the center of the guide side through hole in the vertical direction. The top is against the dolly It is disposed to be inclined away from the carriage than parts further upper so as to be rotatable about said pivot shaft member is supported by the rotating shaft member.
The lock pin is inserted into the guide-side through hole so as to be movable in a vertical direction, and an upper portion of the lock pin has a diameter of the guide-side through hole provided in the guide upper portion. A flange portion having a larger diameter is provided, and the pin support portion has a through portion through which the lock pin can penetrate in the vertical direction when the pin support portion rotates in a direction approaching the guide upper portion. When the connecting arm portion is inserted into the guide portion, the pin support portion is pushed up by the inserted connecting arm portion and is rotated in a direction approaching the upper portion of the guide until reaching the first rotation position. When the connecting arm portion inserted into the guide portion is pulled out, it rotates in a direction away from the guide upper portion until it reaches a second rotation position in contact with the guide lower portion. Penetration The position of the interference edge that is the edge near the carriage on which the pin support is provided is the vertical direction when the pin support is in the first rotation position. It is set to be a position that does not interfere with the lock pin that is movable, and when the pin support portion is in the second rotation position, it is a position that interferes with the lock pin that is movable in the vertical direction. The standby position of the lock pin is the lock inserted into the guide side through hole of the guide upper portion at the interference edge portion of the pin support portion that is in the second rotation position by contacting the guide lower portion. This is the position where the pin is supported.
Then, on the side of the guide lower portion where the connecting arm portion is inserted, a guide surface inclined so as to become lower than the guide lower portion protrudes from the guide lower portion as the distance from the carriage on which the guide lower portion is provided. The guide lower portion and the guide surface are integrally formed.

  According to the first aspect of the present invention, since the worker simply performs the work of moving the carriage so that the connecting arm portion is inserted into the guide portion, the connected state is automatically locked, so that the efficiency can be achieved in a very short time. The operation | work which connects one trolley and the other trolley can be performed well.

In addition, according to the first invention, it is possible to easily realize a dolly connecting apparatus that can more efficiently connect one dolly and the other dolly with a simpler structure.

Further, the cart connecting apparatus described in the present embodiment is such that the guide inclined at the lower side of the guide is inclined downward as it goes away from the cart provided with the guide lower portion on the side where the connecting arm portion is inserted. A surface is provided.

Moreover, according to 1st invention, when inserting a connection arm part in a guide part, a connection arm part can be inserted more easily.

(A) has shown the side view of the trolley | bogie 1 which shows a brake state and a brake lock state, (B) shows the side view of the trolley | bogie 1 which became a brake state and the brake lock cancellation | release state from the state of (A). (C) shows a side view of the carriage 1 that has been brought into a brake release state from the state (B). (A) has shown the top view of the trolley | bogie 1 of the state of FIG. 1 (C), (B) has shown the rear view of the trolley | bogie 1 of the state of FIG. 1 (C). (A) is the perspective view explaining the external appearance of the brake lock member 40, the external appearance of the connection arm part 30 provided with the arm member 32, the external appearance of the support body 11 etc. of the trolley | bogie main body 10, (B) is (A). It is a perspective view explaining the state which assembled | attached each. (A) is the perspective view of the external appearance of each member which comprises the guide part 70, and the external appearance of the lock pin 74, (B) is the perspective view explaining the state which each assembled | attached (A), and the connection arm part 30. is there. It is a figure explaining a mode that lock pin 74 falls automatically, if connecting arm part 30 is inserted in guide part 70 when lock pin 74 exists in a stand-by position. It is a figure explaining the structure of the conventional connection device (The guide part 170, the connection arm part 130, the lock pin 174).

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing.
● [Overall structure of cart 1 (Figs. 1 and 2)]
First, the whole structure of the cart 1 provided with the cart coupling device of the present invention will be described with reference to FIGS. FIG. 1 (A) shows a side view of the carriage 1 in the brake state and the brake lock state, and FIG. 1 (B) shows the carriage 1 in the brake state and the brake lock release state from the state of FIG. 1 (A). The side view is shown and FIG.1 (C) has shown the side view of the trolley | bogie 1 which became the brake release state from the state of FIG. 1 (B). In FIG. 2, detailed description of some members related to the brake device such as the arm member 32 is omitted.
The cart 1 described in the present embodiment includes the cart body 10 and six casters, but the number of casters is not limited to six.
The casters 21 provided on the left and right in front of the cart body 10 and the casters 23 provided on the left and right in the rear of the cart body 10 are free casters, and the direction of the wheels can turn in any direction. The casters 22 provided on the left and right in the vicinity of the center in the front-rear direction of the cart body 10 are fixed casters, and the directions of the wheels are fixed in the front-rear direction.

The caster 22 is attached to the front connecting member 24, and the caster 23 is attached to the rear connecting member 25. The front connecting member 24 and the rear connecting member 25 are connected by the shaft member J1 and are rotatable about the shaft member J1. Further, in FIGS. 1A to 1C, the range of rotation of the rear connecting member 25 in the counterclockwise direction with respect to the front connecting member 24 is restricted by the stopper member 25U. On the other hand, the rotation range of the rear connecting member 25 in the clockwise direction is restricted by the stopper member 25D. The stopper members 25U and 25D are fixed at predetermined locations on the front connecting member 24.
The front connecting member 24 and the rear connecting member 25 are connected by a shaft member J1 to form a connecting member 26. The shaft member J1 of the connecting member 26 is supported by a support member 20 provided downward from the cart body 10. Further, the front or rear (front in the example of FIG. 1) of the connecting member 26 is connected to the carriage main body 10 via an elastic member 26A.
The caster 21 is connected to the cart body 10 via an elastic member 21A.
In addition, the support structure of the caster 22 and the caster 23 is not limited to the support structure of this Embodiment using the connection member 26 grade | etc.,.

The brake device provided in the carriage 1 includes a brake member 61, a brake rod 60, a connection member 34, an arm member 32, a connecting arm portion 30, a brake lock member 40, a brake lock locking member 50, and the like.
The brake member 61 is brought into contact with the caster 22 by the brake rod 60 to bring it into the brake state as shown in FIGS. 1 (A) and 1 (B), and is separated from the caster 22 as shown in FIG. 1 (C). And move to the brake release position where the brake is released.
The brake rod 60 is a member that moves the brake member 61. The brake member 61 is attached to one end, the other end is connected to the connection member 34, and the vicinity of the center is supported so that the brake member 61 does not contact the ground. It is supported by the member 62.
The connection member 34 is attached to the arm member 32 so as to be rotatable about the third rotation axis Z3 of the arm member 32.
Details of the arm member 32, the connecting arm portion 30, the brake lock member 40, and the brake lock locking member 50 will be described below.
In the present embodiment, the connecting arm portion 30 is a member for connecting the carriage back and forth, and is also used as a brake operation lever for setting the brake state or the brake release state.

● [Structure of connecting arm 30 (brake operation lever) and brake lock member 40 (FIG. 3)]
FIG. 3A is a perspective view for explaining the external appearance of the brake lock member 40, the connecting arm portion 30 provided with the arm member 32, and the periphery of the support body 11 of the cart body 10, and FIG. It is a perspective view explaining the state which assembled | attached each of 3 (A).
In the description of the present embodiment, a configuration in which the connection arm portion 30 used for connecting the carriage and the brake operation lever is used will be described. However, the connection arm portion 30 is not used as the brake operation lever. 30 may be fixed to the carriage main body 10 for connection in a state protruding in the horizontal direction shown in FIG.
The support body 11 is attached to the front end portion of the carriage body 10, and the first rotation shaft holder 31 </ b> H is attached to the front end portion of the support body 11 so as to be in the horizontal direction (left-right direction) with respect to the carriage body 10. It has been. A brake lock locking member 50 is attached to the cart body 10.

The connecting arm portion 30 is, for example, a planar member, provided with an arm side through hole 30H and a through portion 30A, and a first rotating shaft member 31 is attached to an end portion.
An arm member 32 is attached to the connecting arm portion 30.
The arm member 32 includes a first arm portion 32A and a second arm portion 32B. The first arm portion 32A has one end attached to the connecting arm portion 30, and the other end side has a second rotating shaft holder 41H and a second rotating shaft holder 41H so as to be parallel to the first rotating shaft member 31. The arm part 32B is attached.
In addition, a regulating member 33 is attached to the second arm portion 32B. And as for the 2nd arm part 32B, one end is attached to 32 A of 1st arm parts, and the connection member 34 is attached to the other end.
The connection member 34 is attached to the second arm portion 32B so as to be rotatable about the third rotation axis Z3.
The arm member 32 moves the position of the brake member 61 to the brake position or the brake release position via the connection member 34 and the brake rod 60.
Further, as shown in FIG. 3B, the first rotation shaft member 31 of the connecting arm portion 30 is attached to the first rotation shaft holder 31H so as to be rotatable around the first rotation axis Z1. It has been. Thereby, the connection arm part 30 and the arm member 32 can be rotated around the first rotation axis Z <b> 1 which is in the horizontal direction with respect to the carriage main body 10.

The brake lock member 40 is a member in which a planar member is formed in a “h” shape, and a second rotating shaft member 41 is attached in the vicinity of the center of the “h” character.
A locking portion 42 is provided at one end of the brake lock member 40, and a brake lock release pedal 43 is provided at the other end.
The weight distribution of the brake lock member 40 is adjusted so that when the second rotation shaft member 41 is supported in the horizontal direction, the locking portion 42 side moves downward due to gravity.
As shown in FIG. 3B, the brake lock release pedal 43 of the brake lock member 40 is inserted into the restriction member 33, and the second rotation shaft member 41 of the brake lock member 40 is rotated around the second rotation axis Z2. It is attached to the second rotating shaft holder 41H so as to be rotatable.
As a result, the brake lock member 40 rotates together with the brake operation member 30 about the first rotation axis Z1 and can rotate about the second rotation axis Z2 with respect to the brake operation member 30. is there. Note that the rotation range of the brake lock member 40 with respect to the brake operation member 30 is restricted by the restriction member 33.

With the configuration of the brake device described above, the operator can change the brake state of the carriage 1 to the brake state and brake lock state shown in FIG. 1 (A), the brake state and brake lock release state shown in FIG. One of the brake release states shown in FIG.
In addition, since the connecting arm portion 30 and the brake operation lever are combined and the brake is released in a state where the connecting arm portion 30 and the brake operating lever are horizontal and project forward, as shown in FIG. 1C, when connecting the carriage 1 back and forth. Very convenient. In addition, since the connecting arm portion 30 and the brake operation lever are also used, the number of parts can be reduced.

● [Structure of coupling device (Fig. 4)]
Next, the structure of the coupling device of the carriage 1 will be described with reference to FIG.
The connecting device of the carriage 1 includes a connecting arm part 30 provided on one carriage and projecting (in the front-rear direction) toward the other carriage, and a guide part 70 provided on the other carriage and into which the connecting arm part 30 is inserted. And a lock pin 74 that locks the connected state.
4A shows a perspective view of each member constituting the guide portion 70 and the lock pin 74, and FIG. 4B shows the guide portion 70 and the lock pin 74 assembled with each member of FIG. 4A. The perspective view of the connection arm part 30 is shown.

As shown in FIG. 4B, an arm-side through hole 30H penetrating in the vertical direction is provided at the distal end of the connecting arm 30 in the protruding direction.
The guide part 70 is a plate-like guide upper part 71 provided so as to be located above the inserted connecting arm part 30 and a plate-like part provided so as to be located below the inserted connecting arm part 30. It has a guide lower portion 72 and a pin support portion 73 that is disposed between the guide upper portion 71 and the guide lower portion 72 and constitutes a linked auto-lock mechanism.
As will be described later, the connection auto-lock mechanism means that when the connection arm portion 30 is inserted into the guide portion 70, the lock pin 74 (located at the standby position) is inserted into the arm side through hole 30H of the connection arm portion 30. It is a mechanism for automatically dropping and locking the connected state.
The guide upper portion 71 is provided with a guide-side through hole 71A for guiding the movement of the lock pin 74 in the vertical direction. In addition, the guide upper portion 71 is provided with a rotation shaft member 71B extending in the left-right direction at a position closer to the pallet of the connection partner than the guide-side through hole 71A. The rotation shaft member 71 </ b> B is inserted into the hole 73 </ b> A of the pin support portion 73 and is fixed to the guide upper portion 71.

The lock pin 74 is inserted through the guide-side through hole 71A so as to be movable in the vertical direction.
Further, an upper portion of the lock pin 74 is provided with a flange portion 74A having a diameter larger than the diameter of the guide-side through hole 71A, an extraction support portion 74B such as a string for facilitating an operator to pull out the lock pin 74, and the like. It has been. The lock pin 74 does not fall from the guide side through hole 71A to the floor surface by the flange portion 74A being locked to the guide side through hole 71A. In addition, in the connection device in the connection lock state, the operator releases the connection lock state by grasping the pulling support portion 74B and pulling up the lock pin 74, and pulls out the connection arm portion 30 from the guide portion 70 to move the cart. The connection state of can be released.

The pin support portion 73 has a plate shape and is disposed so as to cross the virtual axis ZV passing through the center of the guide-side through hole 71A in the vertical direction. The pin support portion 73 is disposed between the guide upper portion 71 and the guide lower portion 72 so that the upper portion is inclined so as to be further away from the carriage (the carriage on which the pin support portion 73 is provided) than the lower portion. Further, the upper portion of the pin support portion 73 is supported by the rotation shaft member 71B so as to be rotatable around the rotation shaft member 71B.
Further, the pin support portion 73 is formed with a through portion 73B through which the lock pin 74 can penetrate in the vertical direction when the pin support portion 73 is rotated in the direction approaching the guide upper portion 71 in the rotation around the rotation shaft member 71B.

Then, when the connecting arm portion 30 is inserted into the guide portion 70, the pin supporting portion 73 is pushed up by the inserted connecting arm portion 30 to rotate the pin supporting portion 73 shown in FIG. 5C. It moves in a direction approaching the guide upper portion 71 until it reaches the (moving position). Further, the pin support portion 73 is in the second rotation position that contacts the guide lower portion 72 when the connecting arm portion 30 inserted into the guide portion 70 is removed (the rotation position of the pin support portion 73 shown in FIG. 5A). It turns in the direction away from the guidance upper part 71 until it becomes.
The position of the interference edge 73 </ b> C, which is an edge around the penetrating part 73 </ b> B of the pin support part 73 and closer to the carriage (the carriage on which the pin support part 73 is provided), is located at the pin support part 73. Is in the first rotation position (the rotation position shown in FIG. 5C), the position is set so as not to interfere with the lock pin 74 that is inserted through the guide-side through hole 71A and movable in the vertical direction. ing. Further, the position of the interference edge portion 73C is inserted in the guide side through hole 71A and can move in the vertical direction when the pin support portion 73 is in the second rotation position (the rotation position shown in FIG. 5A). The position is set so as to interfere with the lock pin 74.

Therefore, as shown in FIG. 4B, when the connecting arm portion 30 is not inserted into the guide portion 70, the pin support portion 73 rotates to the second rotation position where the lower portion contacts the guide lower portion 72. In this state, when the lock pin 74 is inserted into the guide side through hole 71A, the tip end portion 74C of the lock pin 74 interferes with the interference edge portion 73C. In this case, the lock pin 74 is on the interference edge 73C, and the position of the lock pin 74 in this state corresponds to the standby position.
Note that the standby position is set so that the position of the distal end portion 74C of the lock pin 74 is higher than the connecting arm portion 30 to be inserted.

The guide lower portion 72 is provided with a guide side through hole 72A for guiding the movement of the lock pin 74 in the vertical direction on the same axis as the guide side through hole 71A of the guide upper portion 71. 72A may be omitted.
In addition, a guide surface 72B that is inclined so as to become lower as the distance from the carriage (the carriage on which the guide lower portion 72 is provided) is provided on the guide lower portion 72 on the side where the connecting arm portion 30 is inserted. With this guide surface 72B, the connecting arm portion 30 can be smoothly inserted into the guide portion 70.

[Operation when the connecting arm portion 30 is inserted into the guide portion 70 (FIG. 5)]
Next, the manner in which the lock pin 74 automatically drops when the connecting arm portion 30 is inserted into the guide portion 70 will be described with reference to FIG.
FIG. 5A shows a state before the connection, in which the guide portion 70 and the connection arm portion 30 are separated from each other, the pin support portion 73 is in the second rotation position, and the lock pin 74 shows a state where 74 is in the standby position on the interference edge 73C. The worker moves the cart provided with the guide unit 70 and the cart provided with the connecting arm unit 30 so as to relatively approach each other.

When the operator further moves the carriages to bring the two carriages relatively close to each other, as shown in FIG. 5 (B) , after the connecting arm portion 30 comes into contact with the guide surface 72B, the guide portion 70 further moves. The tip of the connecting arm part 30 comes into contact with the pin support part 73. In this state, the pin support portion 73 is still in the second rotation position, and the lock pin 74 is still in the standby position and rides on the interference edge portion 73C.

When the operator further moves the carriages from the state of FIG. 5B and brings the two carriages relatively close to each other, the connecting arm part 30 is further inserted into the back of the guide part 70, and FIG. As shown in FIG. 3, the tip of the connecting arm 30 pushes up the pin support 73, and the pin support 73 rotates to the first rotation position.
When the pin support portion 73 rotates from the second rotation position to the first rotation position, the position of the interference edge portion 73C supporting the lock pin 74 does not interfere with the lock pin 74 (tip portion 74C). Move to. As a result, the lock pin 74 is automatically dropped from the standby position, and is automatically inserted sequentially into the arm side through hole 30H and the guide side through hole 72A at the drop destination, and the connection lock is completed.
5C, when the connection is released from the connection lock state, the operator holds the pull-out support portion 74B, pulls up the lock pin 74, extracts the connection arm portion 30 from the guide portion 70, and the pin support portion 73. Is rotated to the second rotation position, and the lock pin 74 is inserted into the guide-side through hole 71A and disposed at the standby position.

As described above, in the cart connection apparatus described in the present embodiment, the operator moves the connection arm portion 30 of one cart and the guide portion 70 of the other cart so as to relatively approach each other. Since the connection and the lock are automatically performed only by performing the operation, the connection and the lock can be performed in a very short time, and the work efficiency is good.
In addition, the structure of the cart connecting device described in the present embodiment is obtained by adding a pin support portion 73 to the conventional connecting device shown in FIG. A mechanism can be realized.
Moreover, the structure of the pin support part 73 is also very simple and can be easily realized.
Further, by having the guide surface 72 </ b> B, the connecting arm part 30 can be easily inserted into the guide part 70.

The cart connecting apparatus of the present invention is not limited to the appearance, configuration, structure, shape, and the like described in the present embodiment, and various modifications, additions, and deletions can be made without departing from the scope of the present invention. For example, the guide side through hole 72A of the guide lower portion 72 may be omitted.
Further, in the present embodiment, the connecting arm portion 30 and the brake operation lever are shared, but they may be configured by separate members without being shared.
Further, the number of casters (wheels), the support structure of casters (wheels) with respect to the cart body 10 and the like are not limited to those described in the present embodiment.

DESCRIPTION OF SYMBOLS 1 Cargo 10 Cargo body 11 Support body 20 Support member 21-23 Caster 30 Connecting arm part 30H Arm side through-hole 32 Arm member 34 Connection member 40 Brake lock member 41 2nd rotating shaft member 42 Locking part 43 Brake lock release pedal DESCRIPTION OF SYMBOLS 50 Brake lock locking member 60 Brake rod 61 Brake member 62 Support member 70 Guide part 71 Guide upper part 71A, 72A Guide side through-hole 71B Rotating shaft member 72 Guide lower part 72B Guide surface 73 Pin support part 73B Through part 73C Interference edge part 74 Lock pin 74A Flange portion 74C Tip portion Z1 First rotation axis Z2 Second rotation axis Z3 Third rotation axis ZV Virtual axis

Claims (1)

In the dolly connecting device for connecting one dolly and the other dolly in the front-rear direction,
The connection device includes a connection arm portion provided on one carriage and projecting toward the other carriage, a guide portion provided on the other carriage and into which the connection arm portion is inserted, the connection arm portion and the guide. It is composed of a lock pin that locks the connected state with the part,
An arm side through-hole penetrating in the vertical direction is provided at the distal end of the connecting arm in the protruding direction,
In the guide portion, the lock pin is disposed at a standby position that is higher than the connecting arm portion,
When the connecting arm portion is inserted, the guide portion automatically connects the lock pin disposed at the standby position to the arm side through hole of the inserted connecting arm portion. Have
The guide portion includes a guide upper portion provided so as to be positioned above the inserted connection arm portion, a guide lower portion provided so as to be positioned below the inserted connection arm portion, and the guide upper portion. And a pin support part that is arranged between the guide lower part and constitutes the connection auto-lock mechanism,
The guide upper portion is provided with a guide-side through hole for guiding the movement of the lock pin in the vertical direction. The guide upper portion has a left and right position at a position closer to the connecting partner cart than the guide-side through hole. A rotating shaft member extending in the direction is provided,
The pin support portion has a plate shape, and the pin support portion is interposed between the guide upper portion and the guide lower portion so as to cross an imaginary axis passing through the center of the guide side through hole in the vertical direction. The upper part of the rotary shaft member is disposed so as to be inclined with respect to the cart provided with the upper part of the rotary shaft member. Is supported by
The lock pin is inserted through the guide side through hole so as to be movable in the vertical direction,
On the upper part of the lock pin, a flange portion having a diameter larger than the diameter of the guide side through hole provided in the guide upper portion is provided,
The pin support portion is formed with a penetrating portion that allows the lock pin to penetrate in a vertical direction when the pin support portion rotates in a direction approaching the guide upper portion.
When the connecting arm portion is inserted into the guide portion, the pin support portion rotates in a direction approaching the guide upper portion until it is pushed up by the inserted connecting arm portion to reach the first rotation position, and the guide When the connecting arm part inserted into the part is removed, it rotates in the direction away from the upper part of the guide until it reaches a second rotational position that contacts the lower part of the guide,
The position of the interference edge, which is the edge of the pin support part around the penetrating part and close to the carriage on which the pin support part is provided, is determined by the pin support part in the first time. A position that does not interfere with the lock pin movable in the vertical direction when in the moving position, and a position that interferes with the lock pin movable in the vertical direction when the pin support portion is in the second rotation position; Is set to be
The standby position of the lock pin is the lock inserted into the guide side through hole of the guide upper portion at the interference edge portion of the pin support portion that is in the second rotation position by contacting the guide lower portion. Where the pin is supported ,
On the side of the guide lower portion where the connecting arm portion is inserted, a guide surface inclined so as to become lower than the guide lower portion as the distance from the carriage on which the guide lower portion is provided protrudes from the guide lower portion. The guide lower part and the guide surface are integrally formed,
Dolly connecting device.

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