JP2548530Y2 - Tractor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-weight towing vehicle which can be towed by a bicycle or the like and can be easily handled by children and women.

[0002]

BACKGROUND OF THE INVENTION bicycle towing vehicle is used for transport of lightweight luggage, also, because sometimes to lead in hand, the towing vehicle itself is required to be lightweight. Further, since this type of towing vehicle is sometimes sold as a packed product through a mass retailer, it is required to have the above lightweight and simple disassembly and assembly.

[0003] However, the conventional bicycle towing vehicle is mainly composed of a steel frame and has both large weight and large size, which is not suitable for light-weight transportation. Further, since the chassis frame is generally made of metal pipe and includes a welded portion, there is a limit in weight reduction, and it is difficult to disassemble and assemble.

In order to improve this, Japanese Utility Model Application Laid-Open No. 2-14159
No. 2 and Registered Design No. 609126, a towing vehicle has been proposed. However, the chassis frame and the loading platform have different structures, and a large number of steps are required for assembling the axles and wheels and attaching the loading platform to the chassis frame. In addition, there is a disadvantage that the number of parts is large.

[0005]

[Problem to be Solved by the Invention] This invention is lightweight, easy to disassemble and assemble, and easy to use.
The challenge is to provide a towing vehicle for bicycles.

[0006]

Means for Solving the Problems An undercarriage integrally formed of synthetic spores, a connecting pipe bent substantially in an L-shape having a vertical portion and a horizontal portion, and two wheels rotatably supported by an axle are provided. . The chassis, integrally with includes a pipe receiving portion having a vertical connecting hole to the front end, a lower surface both sides, a bearing portion for supporting horizontally the axle of the wheel to the transverse direction, the chassis and the synthetic resin
Prepare and prepare. The lower part of the vertical part of the connecting pipe is made to contribute to the connecting hole of the chassis from above and is fixed non-rotatably and detachably. A portion below the connection hole of the connection pipe is a support leg. The axle of the wheel is fixed to the bearing, and the wheel is mounted on the chassis. The axle may be integrally formed with the chassis and a synthetic resin .

[0007]

The construction in which the undercarriage is made of a synthetic resin integrally formed with the bearing ( or axle), the connecting hole of the connecting pipe, and the like makes the towing vehicle lightweight and reduces the number of parts.
The structure including the undercarriage, the substantially L-shaped connecting pipe, the lower part of the connecting pipe, and the detachable wheels, which are integrally formed of synthetic resin, facilitates the disassembly and assembly of the towing vehicle and reduces the size of the packing.

[0008]

1 and 2 show a towing vehicle 1 according to a first embodiment of the present invention, comprising a flat chassis 2, a connecting pipe 3 bent substantially in an L-shape, and an axle 4. FIG. It has two wheels 5,5. The chassis 2 is an integrally molded product of a synthetic resin, and is a pallet-shaped flat plate in which a peripheral wall 7 and vertical and horizontal reinforcing ribs 8 are formed on the lower surface side of a relatively thin and flat upper wall 6 (FIG. 3). , A pipe receiving portion 9 at the front end, and bearing portions 10, 10 (FIG. 4) on both sides of the lower surface . Pipe receiving part 9
Is provided with a connection hole 11 having a semicircular cross section and penetrating vertically, and a bolt insertion hole 12 is provided penetrating in the front-rear direction.

From the front of the bolt insertion hole 12, the stop bolt 1
3 is formed so that when it is inserted, it crosses the connection hole 11 and its tip reaches the lower surface of the upper wall 6. The bearing unit 10 includes a shaft support hole 14 through which the axle 4 penetrates, and supports the axle 4 horizontally in the horizontal direction. At four corners on the upper surface of the chassis 2, mounting holes 15 with female threads are provided.

The connecting pipe 3 is a lightweight round pipe made of an aluminum alloy and has an outer diameter of the mounting hole 11.
It is substantially equal to the inner diameter of the (semicircle), and is bent into a substantially L-shape to form a vertical portion 3a and a horizontal portion 3b. A lower half of the vertical portion 3a is crushed and formed so as to have a semicircular cross section, and can be inserted into the connection hole 11. In this portion, an adjustment hole 16 penetrating in the front-rear direction is provided at a predetermined interval vertically. It is formed with. The stop bolt 13 can pass through the adjustment hole 16.

An engaging hole 17 is formed at the end of the lateral portion 3b of the connecting pipe 3. This is for attaching the connection fitting 19, and is necessary when connecting the towing vehicle 1 to the saddle post 18 of the bicycle.
The connection fitting 19 is a cylindrical portion 2 that is inserted into the saddle post 18.
0, a connecting protruding piece 22 vertically opposed to the rear part of the cylindrical part 20 and having a respective engaging hole 21; It is connected to the above-mentioned connecting pipe 3 and saddle post 18 using a connecting pin 25 and a connecting bolt 26.

The axle 4 has a screw 27 having a step formed by reducing the diameter at both ends, and the wheel 5 is provided with a central boss 28.
Is rotatably supported by being inserted into the axle 4. The boss 28 is formed as a spacer by projecting the chassis side so that the tire portion does not contact the side surface of the chassis 2 when the wheel 5 rotates.

The assembling of the towing vehicle 1 having the above configuration is performed as follows. The axle 4 is inserted into the shaft support holes 14 of the bearing unit 10 on both sides of the chassis 2, the first washer 29 is fitted to a portion protruding laterally, then the wheel 5 is fitted, and the second washer 30 is further fitted from the outside. Finally, the cap nuts 31 are screwed into the screws 27 at both ends of the axle 4 to prevent them from coming off (FIG. 2).

The lower portion of the vertical portion 3a of the connecting pipe 3 is inserted into the connecting hole 11 of the pipe receiving portion 9 so that the chassis 2 is in a substantially horizontal state, and the lower end thereof is brought close to the ground (road surface).
A locking bolt 13 is inserted into the bolt insertion hole 12 and one of the adjustment holes 16 of the connecting pipe 3 from outside the pipe receiving portion 9, and a nut 33 is attached to a portion reaching the lower surface of the upper wall 6 via a washer 32, The connecting pipe 3 is fixed to the chassis 2 so as not to rotate. The cross-sectional shape of the connecting pipe 3 and the connecting hole 11 is not limited to a semicircle, but may be a non-rotatable non-circular shape such as a polygon. Fixing means.

A portion of the connecting pipe 3 projecting downward from the pipe receiving portion 9 and having a leading end approaching the ground is provided with a support leg 34 for preventing the front portion of the chassis 2 from being greatly inclined.
(FIG. 1). Thus, the assembly is completed.

If the connecting fitting 19 is required, the connecting projection 2
All that is necessary is to fit the connector pin 2 into the end of the lateral portion 3b of the connecting pipe 3 and to fit the connecting pin 25 into the engaging hole 21 and the locking hole 17 from above. Further, in order to attach this to the bicycle, the connecting protrusion 19 is fitted into the saddle post 18 by pushing and opening the fastening protrusions 24 on both sides, and then the connecting bolt 26 is passed through the insertion hole 23 and the nut 34 is mounted. Just fix it. When disassembling the towing vehicle 1, the above procedure may be reversed. However, there is no strict procedure.

The towing vehicle 1 having the above-mentioned structure is configured such that an appropriate container is fixed to the undercarriage 2 or the luggage is directly attached to the undercarriage to pull the connecting pipe 3 by hand.
Alternatively, the distal end of the connecting pipe 3 is connected to a bicycle for use. In any case, the synthetic resin chassis 2 integrally molded is lighter at each step and less tired compared to a conventional frame structure using an iron pipe. Also, the legs 34
Therefore, even if the connection pipe 3 is released in the case of a guide, the inclination of the chassis 2 is small, and the thing on the chassis does not slip down. Further, when the vehicle is towed, the connecting pipe 3 and the chassis 2 are fixed so as not to rotate, so that the chassis 2 can easily follow the connecting pipe 3. When the towing vehicle 1 is mounted on a bicycle and used, the position of the adjustment hole 16 is adjusted so that the support leg 34 is not too long.

The towing vehicle 1 has a small number of parts because the chassis 2 is integrally formed with the pipe receiving portion 9 and the bearing portion 10 and the lower portion of the connecting pipe 3 is used as the support leg 34. Is simple and lightweight, so disassembly and assembly are easy.

FIGS. 5 and 6 show the second and third embodiments, respectively. The structure relating to the support of the wheels 5 is different from that of the first embodiment. 5, the axle 4 is separated into right and left,
Each is a short bolt-shaped axle 4,4.
That is, the wheel 5 is moved from the inside of the bearing portion 10 to the shaft support hole 14.
Is rotatably inserted into the outer protrusion of the axle 4 inserted through
The cap nut 31 has a structure that is prevented from slipping. In the second embodiment, the towing vehicle 1 is further lightened by the amount by which the intermediate portion of the axle 4 is removed. In the third embodiment shown in FIG. 6, the axle 4 is formed integrally with the bearing 10, that is, integrally with the chassis 2 by a synthetic method.
Is directly fitted to a short shaft protruding from both sides of the undercarriage 2, and is secured by attaching a cap nut to a screw 27 formed at the tip of the axle 4. With this configuration, the number of parts is further reduced, and the disassembly and assembly is also simplified. Furthermore, manufacturing costs are reduced.

FIG. 7 shows a fourth embodiment, in which mounting pins 15 formed on the chassis 2 of the first embodiment at four corners of the chassis 2 and male threads at the lower end thereof are provided. Are fixed by screwing, and a net 36 is stretched around them. A simple luggage storage can be made without significantly increasing the total weight of the chassis 2.

FIG. 8 shows a fifth embodiment, in which the undercarriage 2 itself in the first embodiment is configured as a luggage storage portion. As a result, a pipe receiving portion 9 is provided at the front end of the container-like storage portion.
However, the bearing 10 is directly formed on the lower surface. As described above, the chassis 2 can be formed into various shapes and structures.

FIG. 9 shows a sixth embodiment, in which the chassis 2 is directly formed in a housing portion (however, a box shape) similarly to the fifth embodiment, and a similar synthetic resin lid 37 is formed. Is provided. It is suitable for transporting food and transporting in rainy weather.

The above is the embodiment.
Various modifications are conceivable, such as a case made of synthetic resin or stainless steel, and a case where the chassis can be folded, and the invention of the present application is not limited to the illustrated one. In addition, there is a case where a tow truck is used by pushing it by hand.

[0024]

[Effect of the invention] Because of its light weight, it is easy to handle such as towing and carrying, and can be used easily. Since the number of parts is small and the structure is simple, disassembly and assembly are easy. Since the undercarriage, the connecting pipe and the wheels can be easily disassembled, packing and storage can be made compact, multi-stacking is possible, and the transportation cost can be reduced. Since high technology such as pipe welding is not required in the manufacturing process, the manufacturing cost can be reduced and the quality of the product can be stabilized.

[Brief description of the drawings]

FIG. 1 is a perspective view (first embodiment).

FIG. 2 is an exploded perspective view.

FIG. 3 is a front view of a main part in a vertical section.

FIG. 4 is a plan view seen from a lower surface.

FIG. 5 is a plan view of the main part as viewed from below (second embodiment).

FIG. 6 is a plan view as viewed from the lower surface of a main part (third embodiment).

FIG. 7 is a perspective view (fourth embodiment).

FIG. 8 is a perspective view (fifth embodiment).

FIG. 9 is a perspective view (sixth embodiment).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Towing vehicle 2 Undercarriage 3 Connecting pipe 4 Axle 5 Wheel 9 Pipe receiving part 10 Bearing part 11 Connecting hole

Claims (2)

(57) [Scope of request for utility model registration] 1. An undercarriage integrally formed of a synthetic resin, a connecting pipe bent into a substantially L-shape having a vertical portion and a horizontal portion, and two wheels rotatably provided with an axle,
The pipe receiving portion chassis has a vertical coupling hole to the front end, also on the lower surface both sides, a bearing portion for supporting horizontally the axle of the wheel in the lateral direction, Bei formed integrally with the chassis and a synthetic resin < The lower portion of the vertical portion of the connecting pipe is penetrated from above into the connecting hole of the chassis, and the connecting pipe is non-rotatably and removably fixed to the chassis, and the lower portion of the connecting pipe below the connecting hole is used as a support leg. A towing vehicle comprising a wheel axle mounted on the bearing. 2. A chassis made of a synthetic resin integrally molded product, a connecting pipe bent into a substantially L-shape having a vertical portion and a horizontal portion, and two wheels, and the chassis has a vertical connecting hole at a front end. The pipe receiving part and the short wheels that protrude horizontally in the horizontal direction at the center on both sides are combined with the chassis and synthetic resin.
Provided by the body molding, lower than the connecting hole of the both connecting pipe attaching the connecting pipe chassis by penetrating the bottom from above the coupling hole of the chassis and rotatably The Chakusetsu securing vertical parts of the connecting pipe A towing vehicle characterized in that a wheel is rotatably supported on the axle on both sides of the chassis by using a portion as a support leg.