JPH02224B2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Object of the Invention (Field of Industrial Application) This invention relates to a telescopic and foldable transport vehicle.

(Prior Art and Problems to be Solved) Transport vehicles consisting of a loading platform, wheels, and a handle that can be operated by an operator by hand, and in which the handle portion is configured to be extendable and retractable, have been widely used in practice. However, in this type of device, the connection part of the handle part that connects the pipes in a flexible manner bulges one end of the pipe and narrows the end of the adjacent pipe, so that the operator can pull the pipe. It is well known that sometimes the two are firmly pressed together.

However, such a configuration has the drawback that the connection portion loosens after long-term use.

In order to avoid such drawbacks, for example, as seen in Japanese Patent Application Laid-Open No. 52-59437 (Telescopic Assembly for Portable Luggage Carriages), the pipe portion forming the handle portion is made up of three pipes ( Embodiment shown in the drawings), in which one pipe is inserted into an adjacent pipe to expand and contract, in which the adjacent pipe is locked by an elastically protruding engager, and the A structure has been proposed in which the engagement element is unlocked by two sliding members each having a tapered portion that engages with and disengages from the engagement element.

By actively locking adjacent pipes with the engager in this way, it is possible to eliminate the above-mentioned problem of pipe connections becoming loose due to long-term use. However, in such a configuration, as can be readily understood, if the handle is formed of n pipes on each side, the number of tapered sliding members described above is n-1. Naturally, it is necessary, and it cannot help but be structurally complex.

That is, when trying to process a plurality of engagers with one sliding member, since the pipes have different thicknesses, the tapered portion of the sliding member reliably presses the engagers in all pipes. In order to do so, some kind of mechanism is required, and the complexity of the structure inevitably makes it completely impractical.

The present invention has been made in order to cope with such a situation, and in the above-mentioned transport vehicle having a handle equipped with a plurality of pipes, the pipes can be firmly expanded and contracted using an engaging element, and It is an object of the present invention to provide a transport vehicle that is easy to engage and disengage, is easy to operate, and greatly contributes to cost reduction.

(2) Structure of the invention (technical means for solving the problem, its effect) In order to achieve the above object, the present invention provides a method for connecting a first pipe to a second pipe, and a second pipe to a third pipe. In a transport vehicle comprising a handle consisting of a pair of pipes configured to be able to be loaded and unloaded, and a wheel disposed at the lower end of the handle, a handle is provided inside near the lower end of the first pipe and near the upper end of the second pipe. A first engaging/disengaging means elastically engages and disengages from the second pipe, and a second engaging/disengaging means elastically engages and disengages from the third pipe near the upper end, inside the second pipe near the lower end. are respectively arranged, and both second pipes have a first tapered part at the upper end for operating the first engaging/disengaging means, and a first tapered part at the lower end for operating the second engaging/disengaging means. The present invention is characterized in that cylindrical bodies each having two tapered portions are disposed, and a sliding rod is provided to connect these cylindrical bodies.

With this configuration, it is possible to provide a transport vehicle that can be stably used for a long period of time with a simple and inexpensive configuration.

(Description of Embodiments) Fig. 1 is a front view of a transport vehicle according to the present invention, in which the handle A has three pipes 1 on each left and right sides, a pipe 2 into which these are inserted, and a 3 into which the pipes 2 are inserted. It has a grip C on the top.

At the lower end of the pipe 3 at the lowest position in the figure, there are brackets 6, 6, respectively, and a pin 6 at the upper curved part 6a.
It is attached by b.

Further, the support rod 5 rotatably mounted between the brackets 6 has attached thereto portions near the ends of both legs of a frame formed in a substantially U-shape and serving as a stand on which the cargo is placed. The interval between the ends of the frame is the same as the width of the pipes 3, 3, and when in use, the ends of the frame come into contact with the lower ends of the pipes 3 to prevent further rotation. There is.

Further, both ends of the support rod 5 are provided with brackets 6,
6, and a wheel 10 is provided at the end.

Auxiliary load receiving stands 13, 1 are provided on both legs of the frame 4.
3 are rotatably mounted through through holes 13a formed in each, as shown in FIG.
Storage position inside the frame 4 and from this state
It is designed so that it can be rotated 180 degrees to the expanded position, and when expanded, even when large loads are loaded, it can be transported stably due to the original loading function of the frame body 4, which is the original loading platform. can do.

Each of the load carriers is formed with legs 14, the ends of which are provided with recesses 1 for engaging the pipes 3.
4b is formed. Therefore, this leg 14
If it is grounded to the ground, it can be stably erected when using a transport vehicle, and when not in use,
Fold the loading platform 13 as shown in FIG.
The whole can be made compact by engaging with the pipe.

Note that the end portion 6d formed on the bracket is the third
As shown in the figure, it is approximately at the same height as the wheels 10, and functions as a stand for stably standing up the transport vehicle.

To explain the means for expanding and contracting the pipes, as shown in FIG. A diameter-reducing recess 19 formed near the upper end engages with a protrusion formed near the lower end of pipe 1 to prevent both pipes from being pulled out, and the lower end of pipe 2 and the upper end of pipe 3 have the same structure. It is becoming.

A spring 17 is disposed inside the pipe 1 near the lower end thereof, one end of which abuts against the inner wall of the pipe, and the other end, the free end, of which an engager 16 is attached. It always protrudes from the hole 1a formed in the pipe 1 and forms a first engagement/disengagement means.

The engager 1 protruding from the hole of the pipe 1 in this way
When the pipes 1 and 2 are in the extended positional relationship as shown in the figure, the pipe a fits into the hole 2a formed in the pipe 2 to maintain both pipes in the shown extended position.

Pipe 2 and pipe 3 are also formed with second locking and disengaging means having the same structure as above, and both pipes are fixed by this, and the three pipes are fixed by these two locking and disengaging means. It is fixed in the extended position and becomes easy to transport.

As shown in FIG. 1, cylindrical bodies 18a, 18a are slidably disposed on the pipes 2, 2 on both sides, and a sliding rod 18 is stretched between these cylindrical bodies.

As shown in FIG. 6, each cylinder 18a has:
Tapered portions 18b and 18c are formed at both upper and lower ends of each, and when the cylindrical body 18a is slid upward, the upper taper 18b is connected to the engager 1 shown in FIG.
6, when sliding downward, the lower tapered portion 18
The positions and shapes of the tapered portions are set in consideration of the difference in thickness between the pipes 2 and 3 so that the pipes 16a and 16c engage with the engaging elements 16a, respectively.

Since it is configured in this way, the tapered portion 18b
When the engaging element 16 is engaged with the engaging element, the engaging element retracts against the action of the spring 17, and at this time, the engaging element is retracted by hand.
When pressed from above as shown in the figure, since the tip of the engaging element is rounded, the engaging element is further retracted and the pipes 1 and 2 are disengaged, allowing the pipe 1 to be stored inside the pipe 2. Pipe 2 and pipe 3 are also sliding 1
The same operation as described above can be performed by lowering the lever 8 and engaging the tapered portion 18c with the engaging member 16a.

In addition, in order to extend the pipe in the contracted state, if you grasp the grip C and pull it, the engagers 16, 16
It will be readily appreciated that each pipe can be maintained in an expanded state by engaging the respective holes in the corresponding pipe.

(3) Effects of the Invention As explained above, according to the present invention, when the pipes are extended and put into use in a transport vehicle equipped with telescopic pipes, each pipe is firmly held in its respective extended position. It can be maintained stably over a long period of time, and when not in use, the pipe can be brought to its reduced position by simply moving a single slider attached to one of the pipes up and down, making it easy to configure. This greatly contributes to cost reduction.

[Brief explanation of drawings]

Fig. 1 is a front view of a transport vehicle showing an embodiment of the present invention, Fig. 2 is a side view of the same, Fig. 3 is an enlarged view of the same bracket portion, Fig. 4 is an enlarged perspective view of the auxiliary loading platform, and Fig. 5 is an enlarged perspective view of the auxiliary loading platform. The figure is a cross-sectional view showing a mechanism for engaging and disengaging the pipe of the handle, and FIG. 6 is a cross-sectional view of a part of the sliding rod. 1, 2, 3... Pipe, 4... Frame, 6... Bracket, 10... Wheel, 13... Auxiliary loading platform, 16, 16
a... Engagement element, 17... Spring.

Claims (1)

[Claims] 1 A handle consisting of a pair of pipes configured so that the first pipe can be attached to and removed from the second pipe, and the second pipe can be attached to and removed from the third pipe, and a wheel is arranged at the lower end of the handle. In the transport vehicle, the first
A first engaging/disengaging means for elastically engaging and disengaging from the second pipe near the upper end is provided inside the pipe near the lower end thereof, and a first engaging/disengaging means is provided inside near the bottom end of the second pipe near the upper end of the third pipe. a second engaging/disengaging means that elastically engages and disengages the second pipes, and a first tapered portion for actuating the first engaging/disengaging means at the upper end of both second pipes; A transport vehicle comprising cylindrical bodies each having a second tapered portion formed at the lower end thereof for operating the second engaging/disengaging means, and a sliding rod for connecting these cylindrical bodies.