JPH071596Y2 - Stretcher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an expander suitable for application to, for example, a tripod device, and particularly to a retaining structure thereof.

[Outline of device]

The present invention relates to an expander / contractor having a plurality of stages of pipe-shaped bodies that is adjustable in expansion and contraction. In order to prevent the pipe-shaped bodies of each stage from coming off, the pipe-shaped bodies and the pipe-shaped bodies are connected by a string material in the inner space, and By alternately forming hard and soft portions on the cord, it is possible to prevent the pipe-shaped body from coming off with a simple structure, and when the pipe-shaped body expands and contracts, the cord can be separated from the pipe-shaped body and the pipe-shaped body. It is designed so as not to cut into the gap.

[Conventional technology]

For example, in a tripod device for a camera, an extender (leg) that can be adjusted to a desired length is used as the leg member.

That is, this expander is formed by inserting a plurality of stages of pipe-shaped bodies, which have smaller diameters toward the final stage, in a nested manner. When not in use, the pipe-shaped bodies of each stage are stored in a contracted state. It is configured so that the pipe-shaped body of the step is pulled out to be in an expanded state.

By the way, in this type of expander, it is necessary to prevent the adjacent pipe-shaped bodies from coming off from each other so that the pipe-shaped bodies of each stage do not fall off in the expanded state.

The structure for preventing the pipe-shaped body from coming off in the conventional expander is configured as shown in FIG.

In the figure, (1) is an expander, and this expander (1) is composed of a plurality of stages, that is, a two-stage pipe-shaped body (2) of A and B (in this example, a two-stage pipe-shaped body). Although it is only shown in the figure, it is actually composed of a pipe-like body with several stages more than this).

These pipe-like bodies (2) are made of, for example, a metal pipe, and the second stage B is formed to have a smaller diameter than the first stage A.
The pipe-shaped body (2) of the second stage B is nested and inserted in the inner space of the pipe-shaped body (2) of the stage A.

Then, a convex member (3) protruding to the peripheral surface is fixed to the upper end of the pipe-shaped body (2) of the second stage B, while the first stage A
At the lower end of the pipe-shaped body (2), the tip is a convex member (3).
The locking member (4) that is bent so as to correspond to the lower end surface of the first stage A is fixed, and the pipe-shaped body (2) of the second stage B is completely filled with the pipe-shaped body (2) of the first stage A. In the pulled out state, the convex member (3) is brought into contact with and locked by the locking member (4) to prevent the pipe-shaped body (2) of the second stage B from coming off.

[Problems to be solved by the device]

However, according to such a conventional retaining structure in the expander, the pipe-shaped body (2) and the pipe-shaped body (2) are provided.
Since it is necessary to secure a gap between the convex member (3) and the locking member (4) between the two, the second step B with respect to the first step A pipe-shaped body (2). The diameter of the pipe-shaped body (2) must be made considerably small. Therefore, when the pipe-shaped body is actually composed of a large number of stages, there is a limit to the number of stages of the pipe-shaped body due to the large difference in diameter between adjacent pipe-shaped bodies.
In addition, even if a product with a large number of stages is manufactured, the first stage (first stage)
The diameter of the pipe is very large and is not suitable for practical use.

The present invention has been made in view of the above point, and an object thereof is to provide a retaining structure capable of reducing a difference in diameter between adjacent pipe-shaped bodies.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention is an expander in which a plurality of stages of pipe-shaped bodies sequentially formed toward the final stage are inserted in a nested manner, and the pipe-shaped body and the pipe-shaped body are included in the expander. The empty portion is connected with a cord material to prevent the cord from coming off, and the hard material and the soft portion are alternately formed on the cord material.

[Action]

By using the string material as the retaining member in this manner, it is not necessary to secure a large gap between the pipe-shaped bodies, so that the difference in diameter between the adjacent pipe-shaped bodies can be reduced. Also, by alternately forming the hard part and the soft part in the cord, the cord bends in the soft part when the pipe-shaped body contracts and slides, so that the cord-shaped material is inserted in the gap between the pipe-shaped body and the pipe-shaped body. Since there is no risk of biting, the pipe-shaped body is always smoothly slid.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the present invention, the string material (5) is used as the retaining member for the pipe-shaped body (2).

That is, as shown in FIG. 1, the fixed lid body (6) is fitted and fixed in the upper end opening of the pipe-shaped body (2) of each stage, and the pipe-shaped body is provided between the fixed lid bodies (6) of each stage. The cord (5) is arranged in the inner space of the body (2), one end of which is the fixed lid (6) of the pipe-shaped body (2) of the first stage A, and the other end is the pipe of the second stage B. The pipe-shaped body (2) of the second stage B is fixed to the fixed lid body (6) of the body (2), and the pipe-shaped body (2) of the first stage A is
When the cord material (5) is fully pulled out from this, tension is exerted on the cord material (5) to prevent the pipe-shaped body (2) of the second stage B from coming off.

Further, the cord material (5) is provided with a unique device for smoothly expanding and contracting the pipe-shaped body (2).

That is, when an ordinary soft string (cotton string, etc.) is used as this string material, the telescopic slide is made so that the pipe-shaped body (2) of the second stage B can be drawn into the pipe-shaped body (2) of the first stage A. When this is done, the string material may randomly bend and a part of it may enter into the gap between the pipe-shaped body (2) and the pipe-shaped body (2). Therefore, the expansion and contraction of the pipe-shaped body (2). It may not be possible to slide smoothly.

Therefore, in this example, a hard portion, that is, a hard portion (5a) and a soft portion, that is, a soft portion (5b) are alternately formed on the cord (5) with a predetermined length. In this way, the hard part (5
For the cord material (5) having a) and the soft part (5b), prepare an ordinary soft cord (cotton cord or the like), and impregnate the portion to be hardened with, for example, an adhesive to solidify it. Alternatively, it can be easily manufactured by welding plastic or the like.

By thus alternately providing the hard portion (5a) and the soft portion (5b) on the cord material (5), the pipe-shaped body (2) of the second stage B is changed to the pipe-shaped body of the first stage A. When it is contracted and slid so as to be pulled into (2), the cord (5) bends and bends in a 99-fold shape in the soft part (5b) as shown in FIG. The string material (5) does not enter the gap between the pipe-shaped body (2) and the pipe-shaped body (2), and therefore the pipe-shaped body (2) can be slid smoothly.

As described above, in the expander of this example, the pipe-shaped body (2) of the first stage A and the pipe-shaped body (2) of the second stage B are connected by the cord material (5) in the inner space. By using this as a retaining member, the difference in diameter of the pipe-shaped body (2) can be reduced. That is, since the string material (5) is used as a retaining member for the pipe-shaped body (2), a predetermined retaining member for the retaining member is provided between the pipe-shaped body (2) and the pipe-shaped body (2). Since it is not necessary to secure a gap, the gap between the pipe-shaped bodies (2) and the pipe-shaped body (2) may be a minimum gap required for sliding, and therefore the difference in diameter between adjacent pipe-shaped bodies is minimized. be able to. For this reason, even if the number of stages of the pipe-shaped body increases, the diameter of the pipe-shaped body of the first stage (first stage) does not become so large, so that it is compact as a whole, that is, so-called light, thin, short and miniaturized. Is.

Moreover, in this expander / contractor, the cord (5) is attached to the hard part (5
By alternately forming a) and the soft part (5b), the cord material (5) bites into the gap between the pipe-shaped body (2) and the pipe-shaped body (2) when the pipe-shaped body (2) expands and contracts. Therefore, the pipe-like body (2) can always be slid smoothly.

Although the embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to the configuration of this embodiment and various changes and modifications are possible.

[Effect of device]

As described above, in the present invention, since the adjacent pipe-shaped bodies are connected to each other in the inner space by the cord material to prevent the pipes from coming off, the difference in diameter between the adjacent pipe-shaped bodies can be reduced. A compact expander can be realized even if the number of stages of the pipe-shaped body is large, and moreover, by alternately forming hard portions and soft portions on the cord material, the cord material can bite into the gap between the pipe-shaped bodies. Instead, it also has the effect that the pipe-shaped body can always be smoothly expanded and contracted,
It is intended to provide a stretcher excellent in practical effects that has never been seen before.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing an embodiment of the expander of the present invention, FIG. 2 is a vertical cross-sectional side view when the expander is contracted, and FIG. 3 is a vertical cross-sectional side view showing a conventional expander. In the figure, (2) is a pipe-shaped body, (5) is a cord material, (5a) is its hard part, and (5b) is a soft part.

Claims (1)

[Scope of utility model registration request] 1. An expander comprising a plurality of stages of pipe-shaped bodies which are successively formed to have a smaller diameter toward the final stage and are inserted and inserted in a nested manner, wherein adjacent pipe-shaped bodies and pipe-shaped bodies are formed in an inner space thereof. An expander which is connected with a cord to prevent the cord from coming off and has hard parts and soft parts formed alternately on the cord.