JP2013067226A - Coupling device for tractor such as bicycle and trailer such as two-wheeled cart - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coupling device easy to couple and uncouple especially a rear deck of a tractor such as a bicycle to/from a trailer which is a small hand cart.SOLUTION: The coupling device includes: a socket member 5 provided in a tractor 2; and a plug member 6 provided in a trailer 4. The socket member 5 includes: a saddle member 50; a socket fitting 51 with an upward socket 52; and a plunger type stopper fitting 53 with a plunger 53a configured to project into the socket 52. The plug member 6 includes: a rod end member 8; a rotary rod 9 fitted to the rod end member 8; and a plug 60 projected from an outer surface of the rotary rod 9. A plunger receiver part 60a into which the plunger 53a bites is formed in the plug 60, and the plug 60 is inserted into the socket 52.

Description

  The present invention relates to a rear cargo bed portion of a towing vehicle such as a bicycle or a motor-driven two-wheeled vehicle, a three-wheeled vehicle (hereinafter collectively referred to as a bicycle), and a small luggage carrier represented by a rear car (hereinafter generally referred to as a rear car). )) To the towed vehicle as required or belonging to the technical field of a flexible connecting device that can be easily disconnected.

As a means of transporting or delivering light and small parcels such as parcels and gifts at a short distance, a transport method or delivery means for towing travel by connecting a towed vehicle such as a rear car to the rear cargo bed portion of a towed vehicle such as a bicycle. Is widely practiced.
As a prior art of a connecting device or a connecting device for connecting a rear cargo bed of a towed vehicle such as a bicycle and a towed vehicle such as a rear car so as to be towable, for example, those disclosed in Patent Documents 1 and 2 described below are known. It is.

  The “traction joint structure” disclosed in Patent Document 1 below connects a towed vehicle such as a rear car and a towed vehicle such as a bicycle by locking a padlock, or conversely by unlocking. It is a structure to solve. However, in order to perform the connecting operation, strict attention and adjustment are necessary for the alignment of the bicycle and the rear car, so that the operation is troublesome and difficult. In particular, the operation of connecting or disconnecting in a place where the road surface is inclined is recognized as a rather difficult configuration.

  The “joint part of a small vehicle trailer” disclosed in the following Patent Document 2 has a structure in which a pin is inserted into a connection between a tow vehicle and a towed vehicle. Therefore, it is recognized that the pin hole cannot be passed unless both the pin holes are completely matched, and therefore, it is not suitable for an application having a high frequency of connection or release.

JP 2010-228665 A Japanese Patent Laid-Open No. 10-297558

Since the past connecting devices already described in the above Patent Documents 1 and 2 are difficult and difficult to connect or disconnect, it is difficult to use and takes time. There was a problem that it was not suitable for frequent use.
Specifically, the work procedure in the industry for loading luggage in the current rear car, etc., and towing and transporting luggage by bicycle etc. is the delivery person who finished delivering the luggage and returned to the distribution center etc. Immediately disconnect the used rear car and bicycle. In many cases, a bicycle is connected to another rear car that has already been prepared for loading and departure, and the bicycle can be quickly delivered again.
In addition, depending on the delivery destination, the bicycle and the rear car are disconnected, and the rear car is pulled into a building or other facility to deliver the luggage to each floor using an elevator.
Therefore, if the work of connecting or disconnecting the rear car and the bicycle, which is performed several times a day, is troublesome and requires a lot of time, the delivery efficiency will be reduced by that much. Many people wanted improvement.
By the way, the connection between the bicycle etc. and the rear car etc. is fixed in a pair in advance, and the delivery center prepares by loading the luggage into each rear car etc. A system to transfer to a different rear car is also being considered. However, in order to implement such a system, the same number of bicycles as the number of rear cars, etc. are required, and there is a problem that the economic burden is large.

  It is an object of the present invention to easily and quickly connect or disconnect a towed vehicle such as a bicycle and a towed vehicle such as a rear car. It is possible to provide a connecting device for a towing vehicle such as a bicycle and a towed vehicle such as a rear car, which can reduce time loss of a delivery person as much as possible and improve delivery efficiency.

As means for solving the above-described problems of the prior art, a coupling device 1 for a towing vehicle such as a bicycle and a towed vehicle such as a rear car according to the invention described in claim 1 includes:
It is composed of a combination of a socket member 5 that is prepared by being attached to the rear cargo bed 3 of the tow vehicle 2 and a plug member 6 having a universal structure that is prepared by being attached to the tip of the tow frame 40 of the towed vehicle 4.
The socket member 5 is fixed to the saddle member 50 on the rear loading platform 3 of the towing vehicle 2, a socket fitting 51 having an upward socket 52 fixed to the saddle member 50, and protruding into the socket 52. A plunger-type retaining bracket 53 provided with a spring action plunger 53a and attached to the outer surface of the socket bracket 51;
The plug member 6 includes a rod end member 8 connected to the tow frame 40 of the towed vehicle 4 via a universal joint 7, a rotating rod 9 attached to the rod end member 8 so as to be rotatable about an axis, And a plug 60 protruding from the outer surface of the rotating rod 9 and inserted into the socket 52 of the socket fitting 51,
The plug 60 is formed with a plunger receiving portion 60a into which the plunger 53a of the plunger-type retaining bracket 53 bites in the middle of the insertion direction. When the plug 60 is inserted into the socket 52, the plunger 53a is inserted into the plunger receiving portion 60a. It is the structure which cuts in and determines a connection state.

The invention described in claim 2 is a coupling device 1 for a towing vehicle such as a bicycle and a towed vehicle such as a rear car described in claim 1.
In the socket fitting 51, a push-type cylinder lock 54 provided with a latch 54a for locking the plug 60 inserted into the socket 52 of the socket fitting 51 is provided at a position different from the plunger-type retaining fitting 53. The plug 60 is provided with a cylinder locking hole 60b for locking the latch 54a of the push-type cylinder lock 54 at a position different from the plunger receiving portion 60a, and the lock is secured by the latch 54a of the push-type cylinder lock 54. It is the structure which stops and fixes a connection state, It is characterized by the above-mentioned.

The invention described in claim 3 is the connecting device 1 for a towing vehicle such as a bicycle and a towed vehicle such as a rear car described in claim 1 or 2.
The plug 60 of the plug member 6 is formed in a tapered plate shape toward the tip, and a notch-shaped plunger receiving portion 60a is formed at an intermediate position in the insertion direction on the outer periphery of the plug 60. 60, a cylinder lock-through hole 60b for locking the latch 54a of the push-type cylinder lock 54 is provided in a direction orthogonal to the direction of the plunger 53a of the plunger-type retaining metal 53.

A connecting device 1 for a towing vehicle such as a bicycle and a rear vehicle such as a rear car according to the present invention is connected and attached via a universal joint 7 to the tip of a towing frame 40 corresponding to a rudder rod of the towed vehicle 4. When the plug 60 is inserted into the socket 52 of the socket member 5 attached to the rear cargo bed 3 of the towing vehicle 2 to a certain depth, first, the plunger 53a of the plunger-type retaining metal 53 is normally spring-actuated so that the plug 60 The plunger receiving portion 60a is plunged into the plunger receiving portion 60a to be positioned temporarily.
Subsequently, by performing the locking operation of the push-type cylinder lock 54 with the key, the latch 54a bites into the cylinder lock-through hole 60b to be locked, and the traction frame of the rear loading platform 3 of the tow vehicle 2 and the towed vehicle 4 is pulled. The connection with 40 is immediately confirmed completely. Therefore, the person in charge of delivery can immediately drive the tow vehicle 2 and go out to deliver the luggage loaded on the towed vehicle 4.
On the other hand, when all the delivery work of the cargo is completed and returned to the delivery center, the delivery person first operates the push-type cylinder lock 54 with the key to release the latch 54a from the cylinder lock hole 60b. Unlock. Subsequently, by grasping the knob 53b of the plunger-type retaining bracket 53 and pulling the plunger 53a, the plug 60 of the plug member 6 can be pulled out lightly and quickly from the socket 52 of the socket member 51. Can be canceled.
Therefore, by transporting and connecting the tow vehicle 2 to the position of the next towed vehicle 4 that is already ready for loading, the person in charge of delivery can immediately go back to the delivery work of the load, and wasted time. Consumption and loss as much as possible.

More specifically, the connecting device 1 of the towed vehicle and the towed vehicle according to the present invention attaches the plug member 6 to the towing frame 40 corresponding to the rudder rod of the rear car 4 that is the towed vehicle via the universal joint 7. The plug member 6 is swingable in the vertical and horizontal directions with respect to the traction frame 40 of the rear car 4 by the universal joint 7.
Further, since the plug 60 of the plug member 6 protrudes in the radial direction from the rotating rod 9 attached to the rod end member 8 so as to be rotatable around the axis, the plug 60 can freely rotate and swing around the axis. It is.
Therefore, the plug 60 of the plug member 6 has a high degree of freedom and flexibility in positioning and inserting the plug 60 of the plug member 6 into the socket 52 of the socket member 5, and the operation of connecting or disconnecting is extremely easy and easy.
In addition to the towing of the bicycle 2 as a towing vehicle, a relative motion difference is generated in the traveling state of the towed vehicle such as the rear car 4 that follows the towed vehicle due to road surface unevenness or turning of the turning direction. However, since the adaptability, flexibility and adaptability of the coupling device 1 are good, it is impossible for the bicycle 2 to travel and for driving operation, and it is possible to realize safe and stable traveling without generating unnecessary or harmful working force. .

It is the front view which showed the connection apparatus of tow vehicles, such as a bicycle by this invention, and towed vehicles, such as a rear car, in the state just before connection. It is the perspective view which isolate | separated and showed the plug member and socket member which comprise a connection apparatus. It is the front view which expanded the structure of the coupling device shown in the said FIG. 1 in the state just before connection, and fracture | ruptured one part. FIG. 3A is a front view showing the coupling device in a coupled state and a partial cross section of a main portion, and FIG. 2B is a plan view showing a universal joint portion in FIG. It is a left view which shows the socket part of the coupling device shown to the said FIG. 4A.

A coupling device 1 for a towing vehicle such as a bicycle and a rear car according to the present invention is attached to a socket member 5 that is prepared by being attached to a rear cargo bed 3 of the towing vehicle 2 and a tip portion of a towing frame 40 of the towed vehicle 4. It is constituted by a combination with a plug member 6 having a free-form structure prepared in this manner.
The socket member 5 includes a saddle member 50 attached to the rear loading platform 3 of the towing vehicle 2, a socket fitting 51 fixed to the saddle member 50 and having an upward socket (cavity portion) 52, and an inside of the socket 52. The plunger 53a is provided with a plunger 53a that always receives a spring action so as to protrude, and is constituted by a plunger-type retaining metal fitting 53 attached to the outer surface of the socket metal fitting 51.
The plug member 6 includes a rod end member 8 connected to a tow frame 40 in a towed vehicle 4 such as a rear car via a universal joint 7, and a rotating rod attached to the rod end member 8 so as to be able to rotate about an axis. 9 and a plug 60 protruding from the outer surface of the rotating rod 9 and inserted into the socket 52 of the socket fitting 51.
The plug 60 is formed with a plunger receiving portion 60a into which the plunger 53a of the plunger-type retaining bracket 53 bites in the middle of the insertion direction into the socket 52. When the plug 60 is inserted into the socket 52, the plunger receiving portion The plunger 53a bites into 60a to determine the connected state.

In the socket fitting 51, a push-type cylinder lock 54 having a latch 54 a for locking the plug 60 inserted into the socket 52 of the socket fitting 51 is provided at a position different from the plunger-type retaining fitting 53. The plug 60 is provided with a cylinder locking hole 60b for locking the latch 54a of the push-type cylinder lock 54 at a position different from the plunger receiving portion 60a, and the lock is secured by the latch 54a of the push-type cylinder lock 54. It is the structure which stops and confirms a connection state.
The plug 60 of the plug member 6 is formed in a tapered plate shape toward the tip, and a notch-shaped plunger receiving portion 60a is formed on the outer peripheral portion of the plug 60 at a midway position in the insertion direction. Further, in the plug 60, a cylinder locking hole 60b for locking the latch 54a of the push-type cylinder lock 54 is provided in a direction orthogonal to the direction of the plunger 53a of the plunger-type retaining metal 53.

Hereinafter, the present invention will be described based on illustrated embodiments.
A connecting device 1 for a towing vehicle such as a bicycle and a towed vehicle such as a rear car according to the present invention includes a socket member 5 that is prepared by being attached to a rear cargo bed 3 of a bicycle 2 that is a towing vehicle, as shown in FIG. It is composed of a combination with a plug member 6 having a free structure that is prepared by being attached to a front end portion of a traction frame 40 that extends forward as a so-called rudder rod from a rear car 4 that is a towed vehicle.

As described in detail in FIGS. 2 to 5, the socket member 5 includes a saddle member 50 for attaching to the upper surface portion of the rear cargo bed 3 of the bicycle 2,
A socket fitting 51 that is fixed vertically upward from the upper surface of the saddle member 50 and includes a vertically upward socket (cavity) 52;
A plunger 53a that is always subjected to a spring action so as to protrude toward the socket 52 is provided (FIG. 4A), an operation knob 53b is provided on the outer end of the plunger 53a, and a horizontal lateral direction is provided to the outer surface of the socket metal fitting 51. A plunger-type retaining bracket 53 attached to
And a latch 54a for locking the plug 60 of the plug member 6 inserted into the socket 52 of the socket fitting 51, and is attached to the socket fitting 51 in a position and orientation different from the plunger-type retaining fitting 53. It consists of a push-type cylinder lock 54.

Further, the detailed configuration of the socket member 5 will be described.
As shown in FIG. 5, the saddle member 50 is formed in a downward U-shape so as to sandwich the outer peripheral frame of the rear cargo bed 3 of the bicycle 2 from both outer sides, and toward the lower surface side of the rear cargo bed 3. The receiving metal fitting 55 is connected with a plurality of bolts 56 and fixed to the rear cargo bed 3.
In the case of the illustrated example, the socket fitting 51 provided with the vertically upward socket (cavity portion) 52 has a plug 60 of the plug member 6 formed in a plate shape (FIG. 2), so the socket 52 is also the plate-shaped plug. It is formed in a groove-shaped cavity portion into which 60 can be closely inserted. And the socket metal fitting 51 is also formed in the thin bag structure. However, the shape of the plug 60 is not limited to a plate shape, and can be implemented by forming a cylindrical shape, a prismatic shape, or the like. Therefore, it is sufficient to form the socket 52 in the same shape that matches the shape of the plug 60. The socket fitting 51 is integrally joined to the upper surface of the saddle member 50 together with the reinforcing material 51a joined in a T-shape.

  In the illustrated example, the plunger-type retaining metal fitting 53 is installed on the outer surface of the reinforcing member 51 a of the socket metal 51 so that the plunger 53 a protrudes in the horizontal lateral direction toward the socket 52. The plunger 53a enters and bites into a plunger receiving portion 60a formed on the plug 60 of the plug member 6, and stops the plug 60 from being pulled out. The plunger 53a is constantly subjected to a spring action in the protruding direction by a compression spring built in the body portion 53c of the plunger-type retaining fitting 53. Therefore, in the free state, as shown in FIGS. 3 and 4, a suitable length protrudes into the socket 52 and waits for the plug 60 to be inserted. The plunger 53a can be pulled out of the socket 52 and pulled out from the plunger receiving portion 60a of the plug 60 by pulling the operation knob 53b provided on the outer end thereof by the user. The connection can be released by pulling out the socket 52.

Next, the push-type cylinder lock 54 includes a latch 54 a that penetrates and locks into the cylinder lock hole 60 b of the plug 60 of the plug member 6 that is also inserted into the socket 52 of the socket fitting 51. In the case of the illustrated example, the latch 54 a is attached to the socket metal 51 in such a manner that the latch 54 a enters and exits in a direction orthogonal to the plunger 53 a of the plunger retaining metal 53.
In other words, the coupling device 1 of the present invention is locked not only by the above-described plunger type retaining metal fitting 53 but also by this push-type cylinder lock 54 and has a double retaining structure. The push type cylinder lock 54 is locked or unlocked with a dedicated key, and the latch 54a is pulled out from the cylinder lock through hole 60b, whereby the plug 60 can be pulled out from the socket 52 and the connection can be released.

Next, the detailed configuration of the plug member 6 will be described.
The plug member 6 includes a plug (insertion piece) that is inserted into the socket 52 of the socket fitting 51 so as to be easily understood when FIG. 1, FIG. 3, and FIG. 4 are taken together. The plug member 6 is attached to the front end portion of the traction frame 40 of the rear car 4 as a towed vehicle with the following configuration.
4A and 4B, the universal joint 7 is provided at the tip of the traction frame 40 and bent at a direction perpendicular to the traveling direction as follows.
That is, the two joint plates 7a and 7b are applied so as to sandwich the top and bottom of the traction frame 40, and are coupled by two bolts 7c and 7c and nuts 7d penetrating the traction frame 40 in the diameter direction. Yes. One end of the rod end member 8 is connected to the front part of the two joint plates 7a and 7b in a rotatable relationship by hinge bolts 7e that penetrate the two joint plates 7a and 7b. Yes. The thickness of the connecting end portion of the rod end member 8 is considerably narrower than the inner space between the two joint plates 7a and 7b, and a gap is generated. Therefore, the rod end member 8 is connected so as to freely swing in the vertical direction parallel to the paper surface of FIG.
Thus, the rod end member 8 moves in the vertical direction parallel to the paper surface of FIG. 3 by the amount of swinging with rotation about the hinge bolt 7e and the gap between the two joint plates 7a and 7b. Are freely connected. Therefore, the two kinds of swinging possibilities can absorb the unbalanced movement of the traveling state of the bicycle 2 as the towed vehicle and the rear car 4 as the towed vehicle, making the traveling and driving of the bicycle 2 easy and safe. Contributes to running.

Next, a rotating rod 9 having a hollow pipe structure is attached to the distal end side of the rod end member 8 by a mounting bolt 10 so as to rotate while sharing a common center line with the rod end member 8. Yes. Therefore, a female screw hole 8a into which the mounting bolt 10 is screwed sufficiently long is provided at the distal end portion of the rod end member 8 in the center line direction. Reference numeral 11 in FIG. 4B denotes an adjustment nut.
From the outer surface of the rotating rod 9, a plug 60 having a tapered plate shape is projected long in the radial direction, and the plug 60 is inserted into the socket 52 of the socket member 5 closely. However, the shape of the plug 60 of the plug member 6 is not limited to the tapered plate shape toward the tip shown in the drawing. It can be implemented with a tapered cylindrical shape, a prismatic shape or the like. In short, it is sufficient to form the socket 52 of the socket member 5 as a hollow portion having a similar shape.
The plug 60 has a notch that is midway in the insertion direction, and that the plunger 53a enters the side edge of the plunger-type retaining bracket 53 that faces the plunger 53a so that the bite is temporarily engaged. A shaped plunger receiving portion 60a is formed. Further, the side edge portion on the front side of the plunger receiving portion 60a is formed with a steeply inclined portion 60c having a tapered angle that does not obstruct the protrusion of the plunger 53a when the plug 60 is inserted into the socket 52. That is, the plug 60 can be advanced while the plunger 53a is pushed down more strongly than the spring action by the steep slope portion 60c.
The plug 60 is further provided with a cylinder locking hole 60 through which the latch 54a of the push-type cylinder lock 54 is penetrated to make the locking effect effective.

Because of the configuration as described above, the connecting device 1 according to the present invention is configured so that the bicycle 2 is standing on its stand in order to connect the bicycle 2 as a towing vehicle and the rear car 4 as a towed vehicle. Then, the plug 60 of the plug member 6 attached to the front end portion of the traction frame 40 corresponding to the rudder rod of the rear car 4 is inserted into the socket 52 of the socket member 5 attached to the rear loading platform 3 of the bicycle 2 to a certain depth. Then, the plunger 53a of the plunger-type retaining metal fitting 53 waits for the notch-shaped plunger receiving portion 60a to enter the plug 60, and automatically enters the plunger receiving portion 60a by the action of a spring and bites into the temporary fixing. Since positioning is performed, there is no concern that the plug 60 will come off the socket 52 even if the hand is released from the plug 60 thereafter. In addition, the plug 60 of the plug member 6 cannot be removed from the socket 52 by pushing and pulling the plug 60 with arm force.
When the push-type cylinder lock 54 is locked by operating the key in this temporarily fixed state, the latch 54a penetrates into the cylinder locking hole 60b of the plug 60 and is locked, and the bicycle 2 and the rear car 4 are completely connected. There is no concern that the connection will be removed due to mischief.
In other words, anyone can easily and quickly connect the plug 60 of the plug member 6 to the socket 52 of the socket member 5 to a certain depth and with a one-touch quick operation by simply locking the key of the push-type cylinder lock 54. it can. Therefore, the person in charge of delivery can immediately get on the bicycle 2 and go to the delivery work of the load without taking time for the connecting work.
On the contrary, when all the delivery work of the load of the rear car 4 is completed and returned to the delivery center and the connection between the bicycle 2 and the rear car 4 is released, the push type cylinder lock 54 is first unlocked with the key. The latch 54a is pulled out from the cylinder locking hole 60b of the plug 60 and unlocked. Thereafter, the knob 53b of the plunger-type retaining metal fitting 53 is grasped and the plunger 53a is pulled, so that the plunger receiving part 60a of the plug 60 is pulled off. Then, the plug 60 of the plug member 6 can be freely pulled out from the socket 52 of the socket member 5, and anyone can easily and quickly release the connection with a one-touch speed.
Therefore, by transporting and connecting the bicycle 2 to the position of the next rear car 4 where the load is already ready, the person in charge of delivery can go out again to deliver the load, and wasteful time is consumed. Can be prevented as much as possible.

Further, according to the connecting device 1 according to the present invention, the plug member 6 is attached to the traction frame 40 corresponding to the rudder rod of the rear car 4 via the universal joint 7 and the rotating rod 9, so that the plug member 6 can be freely used. The joint 7 has the ability to swing vertically and horizontally with respect to the traction frame 40 of the rear car 4. Further, since the rotary rod 9 can freely rotate and swing around the axis line, the plug 60 of the plug member 6 can be inserted into the socket 52 of the socket member 5 with a high degree of freedom in connection operation. It is easy and easy to do.
As well as the running condition of towed vehicles such as rear cars that follow following towing of towing vehicles such as bicycles, there are relative motion differences due to unevenness of the road surface and curved driving when changing directions, etc. However, since the connecting device 1 is flexible and adaptable as described above, it is impossible for the towing vehicle such as a bicycle to drive and drive operation, and no unnecessary forcible force is generated, realizing safe and stable driving. Is possible.

  Although the present invention has been described above based on the illustrated embodiment, of course, the present invention is not limited to the configuration of the above embodiment. It should be noted that the present invention can be implemented in various modes as design changes, applications, and modifications as required by those skilled in the art without departing from the spirit and technical idea of the present invention.

1 Connecting device 2 Towing vehicle (bicycle, etc.)
3 Rear loading platform 4 Towed vehicle (rear car, etc.)
40 Pulling frame 5 Socket member 6 Plug member 60 Plug 51 Socket bracket 50 Saddle member 52 Socket 53 Plunger-type retaining bracket 53a Plunger 53b Knob 54 Push-type cylinder lock 54a Latch 7 Universal joint 8 Rod end member 9 Rotating rod 60a Plunger receiving portion 60b Cylinder lock hole

Claims (3)

It is composed of a combination of a socket member prepared by attaching to the rear loading platform of the tow vehicle and a plug member having a free structure prepared by attaching to the tip of the tow frame of the towed vehicle,
The socket member includes a saddle member attached to a rear loading platform of the towing vehicle, a socket fitting fixed to the saddle member and having an upward socket, and a plunger that receives a spring action so as to protrude into the socket. A plunger-type retaining bracket attached to the outer surface of the socket bracket,
The plug member includes a rod end member connected to a tow frame of a towed vehicle via a universal joint, a rotating rod attached to the rod end member so as to be rotatable about an axis, and an outer surface of the rotating rod. And a plug that is projected and inserted into the socket of the socket fitting.
The plug is formed with a plunger receiving portion into which the plunger of the plunger-type retaining bracket bites in the middle of the insertion direction, and when the plug is inserted into the socket, the plunger bites into the plunger receiving portion to determine the connected state. A coupling device for a towing vehicle such as a bicycle and a towed vehicle such as a rear car, characterized by being configured.   In the socket metal fitting, a push-type cylinder lock having a latch for locking the plug inserted into the socket of the socket metal fitting is provided at a position different from the plunger-type retaining metal fitting, and the plunger receiving portion is provided on the plug. A cylinder lock through hole that locks the latch of the push type cylinder lock is provided at a position different from that of the push type cylinder lock, and the connection state is determined by locking with the latch of the push type cylinder lock. The coupling device for a towing vehicle such as a bicycle and a towed vehicle such as a rear car according to claim 1.   The plug of the plug member is formed in a tapered plate shape toward the tip, and a notch-shaped plunger receiving portion is formed at an intermediate position in the insertion direction on the outer peripheral portion of the plug member. The towing vehicle for a bicycle according to claim 1 or 2, wherein a cylinder lock-through hole for locking a latch of the push-type cylinder lock is provided in a direction orthogonal to the direction of the plunger of the stopper. And the connecting device of towed vehicles such as rear cars.

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