JP6101731B2 - Dolly coupling device and dolly - Google Patents

Description

  The present invention relates to a truck connecting device that connects two trucks.

  2. Description of the Related Art A cart coupling device that couples / cancels two carts before and after is widely used in practice. A simple coupling device is employed in a hand cart that runs in a factory. Various configurations of simple coupling devices have been proposed (see, for example, Patent Document 1 (FIGS. 1 and 4)).

  As shown in FIG. 1 of Patent Document 1, front and rear trolleys (1, 9) (the numbers in parentheses indicate the symbols described in Patent Document 1. The same applies hereinafter) are provided on one trolley (1). The arm (12) is connected to the connecting pin (33) provided on the other carriage (9) by mechanical coupling.

  The connection is released by removing the connection pin (33) from the arm (12) by pulling up the connection pin (33) manually.

  As shown in FIG. 4 of Patent Document 1, the coupling pin (33) is arranged at the center of the rear frame (3), that is, at the center of the vehicle width of the carriage. Therefore, the workers put the body between the front and rear carts (1, 9) in FIG. 1 and perform the operation of inserting or pulling out the connecting pin (33).

  That is, in the conventional cart coupling device, two operations of inserting the coupling pin (33) when being connected and pulling the coupling pin (33) when releasing the coupling are essential.

Since two operations are necessary and it is necessary to put the body to the vicinity of the connection pin (33) in the center of the vehicle width, the operation time for connection / disconnection becomes longer, and the productivity is affected.
While improvement in productivity is required, a cart connecting device that can increase productivity without requiring insertion / removal of a connecting pin is desired.

JP 2002-187415 A

  This invention makes it a subject to provide the trolley | bogie coupling device which can improve productivity, without requiring insertion / extraction of a connecting pin.

The invention according to claim 1 is a cart connecting device for connecting at least two carts,
A connecting arm portion provided on one cart and connected to the other cart; and a pin lock mechanism provided on the other cart and locked to the connecting arm portion;
The connecting arm portion includes a transverse portion at a tip,
The pin lock mechanism receives a swing pin that rotates when pressed by the crossing portion of the connecting arm portion, and a swing pin that rotates reversely after the crossing portion has passed through the swing pin. A reverse rotation preventing member for preventing the swinging pin, and a pin lifting mechanism for lowering the swinging pin in conjunction with the rotation of the swinging pin pushed by the transverse part ,
The pin elevating mechanism is a cylinder attached to the other carriage and extending vertically, and is accommodated in the cylinder so as to be vertically movable, and is a piston-like elevating member that supports the rocking pin in the form of a connecting rod; A cam integrally provided on an upper portion of the pin; a toggle shaft rotatably attached to the other carriage; a piston receiving portion attached to the toggle shaft and supporting the lifting member; and the cam attached to the toggle shaft And a shaft rotating member that is attached to the toggle shaft and rotates the toggle shaft .

The invention according to claim 2 is characterized in that the shaft rotating member is a pedal.

In the invention which concerns on Claim 3 , the connection arm part is attached to one cart so that a vertical swing is possible, and is urged | biased upwards with the spring,
The toggle shaft is provided with a pin receiving portion that receives a swing pin that rotates reversely beyond the reverse rotation prevention member,
The tilt angle of the pin receiving portion is set so that the crossing portion slides down the swing pin when the other cart is relatively separated from the one cart.

In the invention according to claim 4 , the connecting arm portion includes a swing member that is attached to one carriage so as to be able to swing up and down, and a movable member that is supported by the swing member so as to be movable in the axial direction and has a transverse portion at the tip.
The movable member is provided with a stopper piece extending upward, the tip of the swing member is provided with a stopper receiving portion for receiving the stopper piece, and one carriage is provided with a triangular bracket,
This triangular bracket is a right triangle composed of a base attached to the bottom of the carriage, an orthogonal side extending perpendicularly downward from the base, and a hypotenuse connecting the orthogonal side and the base,
When the movable member is pulled out of the swing member, the stopper piece moves along the oblique side, so that the connecting arm part swings downward, and the stopper piece over the oblique side is sandwiched between the orthogonal side and the stopper receiving part. A triangular bracket is attached.

The invention according to claim 5 is a carriage provided with wheels,
A connecting arm portion extending to another cart is provided at the rear or front portion, and a pin lock mechanism for locking to another vehicle connecting arm portion to be connected to the other cart is provided at the front portion or the rear portion.
The connecting arm portion and the other vehicle connecting arm portion include a transverse portion at the tip,
The pin lock mechanism receives a swing pin that rotates when pressed by the crossing portion of the other vehicle connecting arm portion, and the swing pin that rotates reversely after the crossing portion passes the swing pin. A reverse rotation preventing member that prevents reverse rotation, and a pin lifting mechanism that lowers the rocking pin in conjunction with the rotation of the rocking pin that is pushed by the transverse portion,
The pin elevating mechanism is a cylinder attached to the carriage and extending vertically. The pin elevating mechanism is accommodated in the cylinder so as to be vertically movable. A piston-like elevating member supporting the connecting rod-shaped swing pin; A cam provided integrally with the upper part, a toggle shaft that is rotatably attached to the cart, a piston receiving portion that is attached to the toggle shaft and supports the elevating member, and a cam that is attached to the toggle shaft and contacts the cam A receiving portion and a shaft rotating member that is attached to the toggle shaft and rotates the toggle shaft are provided .

  In the invention according to claim 1, the pin lock mechanism receives the swing pin that rotates when it is pushed by the crossing portion on the connecting arm side, and the swing pin that rotates backward after the crossing portion passes the swing pin. And a reverse rotation preventing member that prevents reverse rotation of the motor.

  When the other carriage is moved closer to one carriage, the crossing portion pushes the swing pin and passes through the swing pin. After this passage, the swing pin rotates in the reverse direction. When the reversely rotating rocking pin hits the reverse rotation prevention member, the rotation stops. The two carts are now connected.

  When connecting, it is not necessary to insert the connecting pin. That is, since the connected state is automatically obtained, the work efficiency can be increased.

Pi unlock mechanism further, since the pivot shaft is provided with a pin lift mechanism to lower the pivot shaft in association with movement which rotates by being pushed by the transverse portion, and forms the pivot shaft hits the reverse rotation preventing member, Two types of forms that do not hit can be created. It is possible to connect the two carriages in such a form that the swing pin hits the reverse rotation prevention member and to separate the two carriages from each other in a form in which the swing pin does not hit the reverse rotation prevention member.

Pin lifting mechanism includes a cylinder, a piston-like lifting member, and a cam provided integrally with the pivot shaft, and a toggle axis, a piston receiving portion for supporting the attached lifting member to the toggle axis, a toggle axis A cam receiving portion that is attached and contacts the cam, and a shaft rotating member that is attached to the toggle shaft and rotates the toggle shaft.
The elevating member is locked and never lowered once it is raised. When the toggle shaft is rotated by the cam, the elevating member is lowered.

In the invention according to claim 2 , the shaft rotating member is a pedal. Because you use your feet, you no longer need to put your body deeply between the two trolleys. In addition, when the carriage is connected, the pedal naturally falls due to the weight of the pedal.
Since the pedal is lowered, even if an object falls on the pedal, the carriage is not separated and the connected state is maintained.

In the invention according to claim 3 , the connecting arm portion can swing up and down, and the toggle shaft is provided with a pin receiving portion that receives a swinging pin that reversely rotates beyond the reverse rotation preventing member, and the other one with respect to one carriage The inclination angle of the pin receiving portion is set so that the crossing portion slides down the swing pin when the cart is relatively separated.

The other cart can be separated from one cart by simply rotating the toggle shaft to the cart separating side. That is, it is not necessary to pull out the connecting pin.
As a result, the connecting operation and the separating operation of the two carriages can be performed without removing and inserting the connecting pin.
Therefore, according to the present invention, there is provided a cart connecting device that can improve productivity without requiring insertion / removal of a connecting pin.

In the invention according to claim 4 , since the connecting arm portion is constituted by the swing member and the movable member that is supported by the swing member so as to be movable in the axial direction and has a transverse portion at the tip, the movable member moves in the axial direction when connected. It is necessary to suppress that. In the present invention, since the stopper piece on the movable member side is sandwiched between the orthogonal side of the triangular bracket and the stopper receiving portion, there is no fear that the movable member moves.
Since the movement suppressing means for the movable member is realized by a simple mechanism, an increase in the manufacturing cost of the cart can be suppressed.

In the invention according to claim 5 , since the carriage is provided with the connecting arm portion and the pin lock mechanism, as in the case of claim 1, it is not necessary to insert the connecting pin when connecting. That is, since the connected state is automatically obtained, the work efficiency can be increased.

It is a side view of the trolley | bogie which concerns on this invention. It is an exploded view of a connection arm part. It is a side view of the cart connecting device concerning the present invention. FIG. 4 is a view taken in the direction of arrow 4 in FIG. 3. It is an exploded view of a pin raising / lowering mechanism. It is the top view and sectional drawing of a toggle axis | shaft. It is sectional drawing of a pin raising / lowering mechanism, and a side view of a cam. It is an effect | action figure at the time of a connection start. It is an effect | action figure when the rocking | fluctuation pin is rock | fluctuating. It is an effect | action figure when a rocking | fluctuation pin reversely rotates. It is a figure which shows the two trolley | bogies in the middle of a connection operation | work. It is an effect | action figure of a triangular bracket. It is an effect | action figure of a pedal. It is a figure explaining connection cancellation | release. It is a figure explaining connection cancellation | release.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

  As shown in FIG. 1, the carriage 10 is a manual transport vehicle that includes a plurality of wheels 11, a front portion includes a pin lock mechanism 40, and a rear portion includes a handle 12 and a connecting arm portion 20. The cart 10 may be a self-propelled cart that uses an electric motor or an engine as a drive source.

  The other vehicle connecting arm portion extending from the rear portion of the cart (not shown) arranged in front of the cart 10 is the same component as the connecting arm portion 20. Therefore, the other vehicle connecting arm portion substitutes for the description of the connecting arm portion 20, and a detailed description thereof will be omitted.

  The connecting arm portion 20 includes a transverse portion 31 (details will be described with reference to FIG. 4) extending in the vehicle width direction at the front end (rear end in the drawing). The pin lock mechanism 40 includes a swing pin 41 and a reverse rotation prevention member 42 that receives the reverse rotation pin 41 and prevents further reverse rotation. The swing pin 41 is lower than the illustrated position during reverse rotation, and stops when it hits the reverse rotation prevention member 42.

  As shown in FIG. 2, a connecting arm portion 20 is attached to a stay 13 extending downward from the bottom of the carriage 10 using a rod 14 so as to be swingable up and down. The connecting arm portion 20 is attached upward by a spring 21. Be forced.

  Preferably, the connecting arm portion 20 includes a swing member 22 that is attached to the carriage 10 so as to be capable of swinging up and down, and a movable member 23 that is supported by the swing member 22 so as to be movable in the axial direction and has a transverse portion 31 at the tip.

Although omitted in the drawing, a plurality of rollers are built in the swing member 22, and the movable member 23 is guided by the plurality of rollers. Since the frictional resistance is extremely small, the movable member 23 is accommodated in the swing member 22 when the swing member 22 is inclined.
In order to make the movement of the movable member 23 toward the storage side smoother, a tension spring may be provided between the swing member 22 and the movable member 23.

The movable member 23 includes a stopper piece 24 extending upward at the rear part.
On the other hand, the swing member 22 includes a stopper receiving portion 25 that receives the stopper piece 24 at the tip.
Further, the carriage 10 includes a triangular bracket 26 at the bottom.

  The triangular bracket 26 is a right triangle composed of a base 27 fixed to the bottom of the carriage 10, an orthogonal side 28 extending downward from the base 27 at a right angle, and a hypotenuse 29 connecting the orthogonal side 28 and the base 27. is there.

  Hereinafter, the cart connecting device 18 provided between the two carts 10 and 10 will be described. In the following description, the two carriages 10 and 10 are distinguished from each other by adding English letters as necessary, such as one carriage 10A and the other carriage 10B. However, it does not matter whether one cart 10A and the other cart 10B are the same structure or non-identical structures.

  As shown in FIG. 3, the cart connecting device 18 includes a connecting arm portion 20 and a pin lock mechanism 40. That is, the cart connecting device 18 includes a connecting arm portion 20 provided on one cart 10A and extending to the other cart 10B, and a pin lock mechanism 40 provided on the other cart 10B and engaged with the connecting arm portion 20.

The connecting arm portion 20 includes a transverse portion 31 extending in the vehicle width direction at the tip.
The pin lock mechanism 40 receives the swing pin 41 that rotates when pressed by the crossing portion 31 of the connecting arm portion 20 and the swinging pin 41 that rotates reversely after the crossing portion 31 passes under the swinging pin 41. A reverse rotation blocking member 42 for blocking the reverse rotation described above.

  As shown in FIG. 4, the pin lock mechanism 40 includes two plates 43 and 43 that extend forward from the other carriage 10 </ b> B, and a bearing block that is fixed to the tips of these plate plates 43 and 43 and supports the toggle shaft 44. 45 and 45, and a shaft rotating member 46 attached to at least one of the toggle shafts 44.

The shaft rotating member 46 is preferably a kick-up pedal 46, but may be a normal pedal, a round bar, or a plate.
The shaft rotation member 46 may be an actuator that pushes up the pedal 46. As the actuator, any of an air cylinder, an electric cylinder and an electromagnetic cylinder can be adopted, and the type and type are not limited.

  The pedals 46 and 46 partially overlap the plates 43 and 43 in plan view. Accordingly, when the pedals 46 and 46 are moved to the back of the drawing, the plate 43 serves as a stopper, so that the pedals 46 and 46 do not drop more than a certain level.

  The connecting arm part 20 has a transverse part 31 at the bottom of the U-shaped tip. The U-shaped tip may be any one of a V-shaped tip, a U-shaped tip, an L-shaped tip, and a T-shaped tip. However, considering that the cart 10B turns, U-shaped, V-shaped and U-shaped are recommended.

  The pin lock mechanism 40 includes a pin elevating mechanism as a toggle mechanism that moves the swing pin 41 up and down. The structure of this pin lifting mechanism will be described in detail.

  As shown in FIG. 5, the pin elevating mechanism 50 is attached to the other carriage (in this example, the plate 43) and extends vertically, and is accommodated in the cylinder 51 so as to be vertically movable and a piston-like elevating member 52. A connecting rod-shaped swing pin 41 attached to the elevating member 52 via a piston pin 53, a cam 54 provided integrally on the upper portion of the swing pin 41, and a bearing on the other carriage (plate 43). It comprises a toggle shaft 44 that is rotatably mounted via a block 45, a cap 56 that is screwed into the upper portion of the cylinder 51, and a compression spring 57 that is disposed between the cap 56 and the elevating member 52.

The piston-like lifting member 52 includes a flat surface 58 formed by cutting a part of a column at the rear. The flat surface 58 is in sliding contact with a corner block 59 fixed to the plate 43. As a result, there is no concern that the elevating member 52 rotates around the vertical axis.
In addition, the elevating member 52 has a stepped portion 61 formed by cutting out the front lower portion. A part of the cam 54 can be seen through the step portion 61 in a side view.

  As shown in FIG. 6A, the toggle shaft 44 is a round bar that is rotatably supported by bearing blocks 45, 45, and includes a receiving piece 62 in the middle. The receiving piece 62 is manufactured separately and is fixed to the round bar with a screw. The receiving piece 62 may be integrally formed with the round bar by cutting.

  As shown in FIG. 6B, which is a cross-sectional view taken along the line bb of FIG. 6A, the receiving piece 62 includes a pin receiving portion 63 having a triangular cross section. The inclination angle θ formed by the inclined surface formed on the pin receiving portion 63 and the vertical line is selected from the range of 15 to 35 °, and is preferably set to 25 °. The operation of the inclination angle θ will be described with reference to FIG.

As shown in FIG. 6C, which is a sectional view taken along the line cc of FIG. 6A, the receiving piece 62 is provided with a cam receiving portion 64 having a rectangular cross section.
As shown in FIG. 6D, which is a sectional view taken along the line dd in FIG. 6A, the receiving piece 62 includes a piston receiving portion 65 having a rectangular cross section. The upper surface of the piston receiving portion 65 is approximately several millimeters higher than the upper surface of the cam receiving portion 64.

As shown in FIG. 6A, the pin receiving portion 63, the cam receiving portions 64 and 64, and the piston receiving portions 65 and 65 are integrally formed in one receiving piece 62. Such a receiving piece 62 is detachably fixed to the toggle shaft 44 with a screw or the like. With this structure, after the toggle shaft 44 is inserted into the bearing blocks 45, 45, the receiving piece 62 can be attached to the toggle shaft 44.
If the bearing block 45 has a structure that can be divided, the receiving piece 62 can be integrally formed on the toggle shaft 44 by machining.

As shown in FIG. 7A, the flat surface 58 is in sliding contact with the corner block 59, and the step portion 61 is placed on the piston receiving portion 65. The height difference from the elevating member 52 to the cap 56 is H7.
The main part of FIG. 7A is shown in FIG. As shown in FIG. 7B, the step portion 61 is placed on the piston receiving portion 65, and a toggle structure is formed by the edge portion 61 a of the step portion 61 and the edge portion 65 a of the pin receiving portion 65. With this toggle structure, the lift member 52 once raised does not fall, and its height is maintained.

The operation of the cart connecting device 18 having the above configuration will be described next.
As shown in FIG. 8A, the other carriage 10B is brought closer to one stationary carriage 10A. Alternatively, one cart 10A is brought close to the other cart 10B that is stationary.
Then, the crossing part 31 starts to push the swing pin 41.

As shown in FIG. 8C, the cam 54 rotates counterclockwise in the drawing and pushes down the cam receiving portion 64. As a result, the toggle shaft 44 is slightly rotated in the clockwise direction in the drawing.
As shown in FIG. 8B, when the toggle shaft 44 is rotated, the piston receiving portion 65 rotates in the clockwise direction, and the elevating member 52 is slightly lowered.

As shown in FIG. 9A, the other carriage 10B is further brought closer to one stationary carriage 10A. Then, the crossing portion 31 tilts the swing pin 41.
As shown in FIG. 9C, the cam 54 rotates counterclockwise in the drawing and pushes down the cam receiving portion 64. As a result, the toggle shaft 44 rotates clockwise in the drawing.

  As shown in FIG. 9B, the piston receiving portion 65 rotates in the clockwise direction together with the toggle shaft 44, and the elevating member 52 is lowered. The elevating member 52 is smoothly lowered by its own weight and the urging force of the compression spring 57. The height difference from the elevating member 52 to the cap 56 increases H9 (H9 becomes larger than H7 shown in FIG. 7).

When the crossing portion 31 further pushes the swing pin 41, the crossing portion 31 passes under the swing pin 41. Then, the swing pin 41 becomes free and starts to reversely rotate due to gravity.
As shown in FIG. 10, the swing pin 41 rotates in the reverse direction (rotates clockwise in the drawing) and stops when it hits the reverse rotation prevention member 42.

  As shown in FIG. 11, when one cart 10 </ b> A tries to pull the other cart 10 </ b> B, the swing pin 41 is prevented from reverse rotation by the reverse rotation prevention member 42, so that the movable member 23 is pulled out from the swing member 22. It is. By being pulled out, the stopper piece 24 approaches the triangular bracket 26.

  As shown in FIG. 12A, the stopper piece 24 moves along the oblique side 29 of the triangular bracket 26. When further moved, as shown in FIG. 12B, the stopper piece 24 passes through the oblique side 29 and hits the stopper receiving portion 25 and stops. At this time, the stopper piece 24 is interposed between the stopper receiving portion 25 and the orthogonal side 28 because it is pulled up by the spring (FIG. 2, reference numeral 21).

When the movable member 23 attempts to move forward (move to the right in the figure) with respect to the swing member 22, the stopper piece 24 hits the stopper receiving portion 25 and the movement is restricted.
When the movable member 23 tries to move backward (move to the left in the figure) with respect to the swing member 22, the stopper piece 24 hits the orthogonal side 28 and the movement is restricted.
As a result, as shown in FIG. 12C, the connected state of the two carriages 10A and 10B is completed. Thereafter, it is possible to travel while pulling the other cart 10B with one cart 10A.

As is clear from the above description, the toggle action described in FIG. 7B is canceled at the time of connection, and the toggle shaft 44 naturally rotates in the direction in which the pedal 46 is lowered.
At this time, as described with reference to FIG. 4, a part of the pedal 46 hits the plate 43.
As a result, as shown in FIG. 13, the pedal 46 as the shaft rotation member is in a form of being placed on the plate 43.
Even if an object falls on the pedal 46, the pedal 46 does not drop any further, and the form in which the swing pin 41 is in contact with the reverse rotation preventing member 42 is maintained.

Next, a procedure for releasing the connection is described.
In FIG. 13, the pedal 46 is kicked up. Alternatively, the pedal 46 is pushed up by an actuator.
As shown in FIG. 4, since the pedal 46 is attached to the end of the toggle shaft 44 extending in the vehicle width direction, the pedal 46 is disposed at a position close to the side from the vehicle width center.

The conventional connecting pin is arranged at the center of the vehicle width. Therefore, the worker had to put his body between the two carts and pull out the connecting pin by hand.
On the other hand, in this invention, the pedal 46 is arrange | positioned in the position which approached the side from the vehicle width center, and kicks up the pedal 46 using a leg instead of a hand. The legs are long enough. As a result, the worker can operate the pedal 46 with his / her foot with almost no body between the two carriages.

Alternatively, when the pedal 46 is raised by the actuator, the worker does not need to approach the carriage.
In any case, the pedal operation of the present invention can be carried out in a shorter time and more easily than the conventional pulling operation of the connecting pin.

In FIG. 13, when the pedal 46 is raised, the toggle shaft 44 rotates counterclockwise in the drawing.
Then, as shown in FIG. 14, the piston receiving portion 65 raises the elevating member 52, and as a result, the lower end of the swing pin 41 is detached from the reverse rotation preventing member 42. In this state, when one cart 10A is moved forward, the crossing portion 31 moves to the left in the figure, and the swing pin 41 is pulled.

As shown in FIG. 15, the swing pin 41 hits the pin receiving portion 63 and stops. The crossing portion 31 slides down as shown by an arrow with respect to the swing pin 41 stopped in an inclined state, and comes off from the swing pin 41. The inclination angle θ is set by obtaining the angle at which the crossing portion 31 slides down by experiment. The inclination angle θ is selected from a range of 15 to 35 °, and is preferably set to 25 °.
That is, as shown in FIG. 3, the swing pin 41 is vertical due to its own weight, and the movable member 23 is housed in the swing member 22 by tilting.

In the embodiment, two carts are connected, but three or more carts may be coupled.
In the embodiment, the pin lock mechanism 40 is provided at the front portion of the carriage 10 and the connection arm portion 20 is provided at the rear portion. However, the pin lock mechanism 40 is provided at the rear portion of the carriage 10 and the connection arm portion 20 is provided at the front portion. It may be provided.

  The present invention is suitable for a truck connecting device that connects two trucks.

  DESCRIPTION OF SYMBOLS 10 ... Carriage, 10A ... One car, 10B ... The other car, 18 ... Carriage connecting device, 20 ... Connecting arm part (other car connecting arm part), 21 ... Spring, 22 ... Swing member, 23 ... Movable member, 24 ... stopper piece, 25 ... stopper receiving part, 26 ... triangular bracket, 27 ... bottom side, 28 ... orthogonal side, 29 ... oblique side, 31 ... transverse part, 40 ... pin lock mechanism, 41 ... swing pin, 42 ... reverse rotation prevention 44, toggle shaft, 46 ... shaft rotating member (pedal), 50 ... pin lifting mechanism, 51 ... cylinder, 52 ... lifting member, 54 ... cam, 63 ... pin receiving portion, 64 ... cam receiving portion, 65 ... piston Receiving part, θ: inclination angle.

Claims (5)

A truck connecting device for connecting at least two trucks,
A connecting arm portion provided on one cart and connected to the other cart; and a pin lock mechanism provided on the other cart and locked to the connecting arm portion;
The connecting arm portion includes a transverse portion at a tip,
The pin lock mechanism receives a swing pin that rotates when pressed by the crossing portion of the connecting arm portion, and a swing pin that rotates reversely after the crossing portion has passed through the swing pin. A reverse rotation preventing member for preventing the swinging pin, and a pin lifting mechanism for lowering the swinging pin in conjunction with the rotation of the swinging pin pushed by the transverse part ,
The pin elevating mechanism is a cylinder attached to the other carriage and extending vertically, and is accommodated in the cylinder so as to be vertically movable, and is a piston-like elevating member that supports the rocking pin in the form of a connecting rod; A cam integrally provided on an upper portion of the pin; a toggle shaft rotatably attached to the other carriage; a piston receiving portion attached to the toggle shaft and supporting the lifting member; and the cam attached to the toggle shaft And a shaft rotating member that is attached to the toggle shaft and rotates the toggle shaft . The cart connecting device according to claim 1, wherein the shaft rotating member is a pedal. The connecting arm portion is attached to the one carriage so that it can swing up and down, and is biased upward by a spring,
  The toggle shaft includes a pin receiving portion that receives the swing pin that rotates reversely beyond the reverse rotation preventing member,
  An inclination angle of the pin receiving portion is set so that the transverse portion slides down the swing pin when the other cart is relatively separated from the one cart. The cart coupling device according to claim 1 or 2. The connecting arm portion is composed of a swing member that is attached to the one carriage so as to be able to swing up and down, and a movable member that is supported by the swing member so as to be movable in the axial direction and has the transverse portion at the tip.
  The movable member includes a stopper piece extending upward, the swing member includes a stopper receiving portion that receives the stopper piece, and the one carriage includes a triangular bracket.
  This triangular bracket is a right triangle composed of a bottom attached to the bottom of the carriage, an orthogonal side extending perpendicularly downward from the base, and a hypotenuse connecting the orthogonal side and the base,
  When the movable member is pulled out with respect to the swing member, the stopper piece moves along the oblique side, whereby the connecting arm portion swings downward, and the stopper piece that has crossed the oblique side is separated from the orthogonal side. The cart coupling device according to claim 3, wherein the triangular bracket is attached so as to be sandwiched between the stopper receiving portions. A dolly with wheels,
  A connecting arm part is provided in the rear part or the front part, and a pin lock mechanism is provided in the front part or the rear part to be engaged with another vehicle connecting arm part connected to another carriage.
  The connecting arm portion and the other vehicle connecting arm portion include a transverse portion at the tip,
  The pin lock mechanism receives a swing pin that rotates when pressed by the crossing portion of the other vehicle connecting arm portion, and the swing pin that rotates reversely after the crossing portion passes the swing pin. A reverse rotation preventing member that prevents reverse rotation, and a pin lifting mechanism that lowers the rocking pin in conjunction with the rotation of the rocking pin that is pushed by the transverse portion,
  The pin elevating mechanism is a cylinder attached to the carriage and extending vertically. The pin elevating mechanism is accommodated in the cylinder so as to be vertically movable. A piston-like elevating member supporting the connecting rod-shaped swing pin; A cam provided integrally with the upper part, a toggle shaft that is rotatably attached to the cart, a piston receiving portion that is attached to the toggle shaft and supports the elevating member, and a cam that is attached to the toggle shaft and contacts the cam A cart comprising: a receiving portion; and a shaft rotating member that is attached to the toggle shaft and rotates the toggle shaft.

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