JPH066014U - Carrier - Google Patents

Abstract

(57) [Summary] [Purpose] In a carrier that pulls a dolly with a towing vehicle,
During forward traction turning, the dolly can smoothly follow the towing vehicle to make a relatively small turn, and
When the vehicle is turned backward, the trolley can be easily turned in the direction in which the tow vehicle is turning, and the operability is improved. [Composition] A connecting tool 17 on the towing vehicle 5 side and a connected tool 14 on the bogie 6 side are connected so as to be relatively movable in the front-rear direction, and the connected tool 14 is moved rearward relative to the connecting tool 17. In the towed state, the connecting tool 17 of the connected tool 14
To the left and right about the vertical axis with respect to
In the reverse state in which is moved forward with respect to the connecting tool 17, the left and right swinging of the connected tool 14 around the axis of the vertical axis with respect to the connecting tool 17 is prevented.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 TECHNICAL FIELD The present invention relates to a transport vehicle in which a dolly is connected to a rear portion of a steerable tow vehicle.

[0002]

[Prior art]

 Conventionally, as a carrier of this type, a tow vehicle and a trolley with caster wheels are integrally fixedly connected, or as shown in Japanese Utility Model Laid-Open No. 56-95907, the tow vehicle and the trolley are longitudinal axes. There was one connected around the heart so that it could swing to the left and right.

[0003]

[Problems to be solved by the device]

 In the former structure in which the tow vehicle and the bogie are fixedly connected, the rear bogie can be moved in the direction in which you want to turn when moving backward, but if you turn the vehicle to the left or right in the forward tow state, The dolly was swung to the left or right, which required a large turning space, making it difficult to make small turns. Also, in the latter structure in which the tow vehicle and bogie are connected so that they can swing to the left and right around the vertical axis, the bogie can easily follow the movement trajectory of the tow vehicle during forward towing, and a relatively small turn is required. Although it is possible, if the vehicle is moved backward, the cart may oscillate left and right with respect to the direction of travel, causing a sideways bend, which makes the operation difficult. The present invention has been made in view of the above circumstances, and it is an object of the present invention to solve the above problems and to improve handling performance by facilitating the operation of a transport vehicle during forward and reverse travel.

[0004]

[Means for Solving the Problems]

 The characteristic configuration of the present invention for achieving the above-mentioned object is, in the transport vehicle described at the beginning, connecting the connecting member on the towing vehicle body and the connected member on the trolley side so as to be relatively movable in the front-rear direction. , In the forward traction state where the connected tool moves rearward with respect to the connecting tool, the connected tool is allowed to swing laterally around the longitudinal axis with respect to the connecting tool, and the connected tool moves forward with respect to the connecting tool. In the backward traction state, it is configured so as to prevent lateral swinging of the coupled tool about the longitudinal axis with respect to the coupling tool.

[0005]

[Action]

 According to the above configuration, when the tow vehicle body is moved forward, the connected tool moves rearward relative to the connecting tool and can be towed. In this state, the bogie can swing to the left and right with respect to the towed vehicle, so the tow vehicle follows the movement trajectory of the towed vehicle when the vehicle turns forward. When the vehicle is moved backward, the connected tool moves forward relative to the connecting tool, and the bogie does not swing left and right with respect to the draft vehicle. It moves in the turning direction of the tow vehicle together with.

[0006]

[Effect of device]

 As is apparent from the above description, according to the present invention, when the vehicle turns forward, the truck folds laterally to follow the towed vehicle for smooth turning, and when the vehicle turns backward, the vehicle is connected and fixed to the towed vehicle. It is possible to make a turning movement in the desired direction by making it into a form, and it is now possible to easily perform turning maneuvering even when moving backward and forward. Moreover, since the change of the connection form is automatically made by switching between forward and backward movement, it is not necessary to perform a separate operation for changing the connection form each time the forward or backward movement is changed, and the handleability is excellent. Has become.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a small electric vehicle as an example of a vehicle according to the present invention. In this transport vehicle, a trolley 6 is provided behind a tow vehicle 5 having a front wheel 2 which can be steered by operating a steering handle 1 and a pair of left and right rear wheels 4 and 4 driven and driven by an electric motor 3. It is configured to be connected and towed.

The cart 6 is provided with a pair of left and right caster wheels 7 and 7 below the cargo bed 8 and, as shown in FIG. 2, is capable of undulating and swinging around the horizontal axis on four sides of the cargo bed 8. Side frames 9 are provided, and each side frame 9 is provided with a support rod tool 11 for supporting the side frames 9 in an upright posture. As shown in FIG. 4, the support rod 11 is insertable into and removable from a support hole 10 provided in the cargo bed 8, and is biased by a spring 12 in the direction of the support hole 10. By pulling out from the support hole 10, the side frame 9 can be opened and rocked.

At the front end of the carriage 6, there is provided a connected tool 14 in which a pair of front and rear studs 15 and 16 are provided upright, and at the rear end of the tow vehicle body 5, engagement holes for engaging both studs 15 and 16 are provided. The tractor body 5 is provided with a connecting member 17, and the trolley body 5 can be pulled by inserting the studs 15 and 16 into the engaging holes 18. Further, as shown in FIG. 3, the engagement hole 18 is a straight line that allows the connecting tool 17 and the connected tool 14 to move relative to each other in the front-rear direction when the studs 15 and 16 are engaged. The elongated stud portion 18a is formed in the front-rear direction, and the front stud 15 is swayed about the rear stud 16 while the rear stud 16 is instructed to engage with the rear end of the elongated hole portion 18a. A partially arcuate guide hole portion 18b that is movable is formed so as to intersect the middle portion of the long hole portion 18a. Therefore, when the tow vehicle body 5 is moved forward, as shown in FIG. 3 (a), the connected tool 14 moves rearward relative to the connecting tool 17, and the rear end and the rear stud of the slot 18a. 16 can be engaged and the truck 6 can be towed by the tow vehicle body 5. Then, when the tow vehicle body 5 is turned to the left or right in the forward towed state, as shown by the chain double-dashed line in FIG. 3 (a), the carriage 6 is moved to the inner side of the tow vehicle body 5 about the rear stud 16 as an axis. It is possible to swing right and left and move substantially following the turning locus of the tow vehicle body 5, and it is possible to smoothly turn without increasing the turning diameter. Further, when the tow vehicle body 5 is moved backward, as shown in FIG. 3B, both the slids 15 and 16 relatively move forward, and the front stud 15 engages with the front end of the long hole portion 18a and is supported. As a result, the two studs 15 and 16 are prevented from swinging left and right by the elongated holes 18a, the carriage 6 and the towing vehicle body 5 are integrally connected, and the carriage 6 does not laterally bend and the towing vehicle body 5 does not move. Move in the turning direction.

[Other Embodiments] As shown in FIG. 5, the connecting tool 17 is formed of a tubular member having an opening 17a that widens rearward, and the connected tool 14 is inserted into the connecting tool 17. It is also possible to use a structure in which the shaft-shaped member is used, and the vertical axis connecting pin 19 provided in the opening 17a is inserted into the longitudinal slot 20 provided in the connected tool 14. According to this configuration, during forward traction traveling, as shown in FIG. 5 (a), the connected tool 14 can swing left and right within the opening 17a around the vertical axis connecting pin 19, and when traveling backward, FIG. As shown in (b), the to-be-coupled tool 14 is deeply inserted into the coupling tool 17 so that it cannot be swung left and right, and functions similarly to the previous example.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is an overall side view of a carrier according to the present invention.

[Fig. 2] Overall plan view of the carrier

FIG. 3 is a plan view showing a connecting portion between a tow vehicle and a bogie,
(A) shows the forward traction state, (b) shows the reverse state

FIG. 4 is a vertical sectional side view showing a side frame portion of a luggage carrier.

FIG. 5 is a partially cutaway plan view showing another embodiment of the connecting portion, (a) showing a forward traction state, and (b) showing a reverse moving state.

[Explanation of symbols]

 5 Traction vehicle 6 Bogie 7 Castor wheel 14 Connected tool 17 Connector

Claims (1)

[Scope of utility model registration request] 1. A transport vehicle in which a trolley (6) having caster wheels (7) is connected to a rear portion of a steerable tow vehicle (5), and a coupling tool (17) on the side of the tow vehicle (5). And the to-be-joined tool (14) on the dolly (6) side so as to be relatively movable in the front-rear direction, and the to-be-joined tool (14) is moved rearward with respect to the joining tool (17). In the state, in a reverse traction state in which the coupled tool (14) is allowed to swing laterally around the vertical axis with respect to the coupling tool (17) and the coupled tool (14) moves forward with respect to the coupling tool (17). ,
A transport vehicle, characterized in that it is configured to prevent lateral swinging of a coupled tool (14) with respect to a coupling tool (17) about a longitudinal axis.