JP4210074B2 - Telescopic structure such as shelf legs - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to, for example, a shelf used for pressing-in, and relates to a structure in which the support legs can be expanded and contracted steplessly and the load resistance is increased.
[0002]
[Prior art]
Conventionally, a shelf is used for the purpose of increasing the storage efficiency such as pushing-in. The storage shelf is configured by supporting a shelf board with a support leg, and installing the storage board in a storage space such as a push-in portion, thereby partitioning the storage space up and down by the shelf board. Therefore, for example, a futon and miscellaneous goods can be arranged at the same time. In addition, there is also known a shelf in which a support leg is configured to be extendable in order to change the height position of the shelf board according to the stored article.
[0003]
In this case, the support leg is inserted into the thick pipe so that the thin pipe can be taken in and out, and a structure in which the thin pipe can be fixed to a desired length by a stopper is adopted. Some stoppers have a structure in which grooves or holes are formed at equal intervals in the pipe and the shelf position is changed stepwise by engaging with the stoppers. However, this does not allow fine adjustment of the shelf position, and may cause dead space. Therefore, at present, shelves that employ stoppers that can adjust the shelf position steplessly are the mainstream. In other words, a male screw member with a chuck is provided at the end of a thick pipe, while a female screw member having a tapered surface is inserted into the thin pipe, and the thin pipe is appropriately lengthened. A telescopic structure using a stopper in which a chuck firmly tightens a thin pipe by a diameter-reducing action by the tapered surface by tightening the screw into a male screw member is known.
[0004]
[Problems to be solved by the invention]
However, the above-described telescopic structure has a problem that the load resistance cannot be increased because the thin pipe is frictionally tightened by the reduced diameter of the chuck. That is, if a load exceeding the friction force between the outer surface of the fine pipe and the inner surface of the chuck is applied to the shelf plate, the thin pipe slides down to the thick pipe.
[0005]
The present invention solves this problem, and an object of the present invention is to disclose a telescopic structure such as a shelf foot that can adjust the length of a support leg steplessly and ensure a load resistance larger than that of a conventional one. It is to be.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, a thick pipe having a cylindrical male screw member provided at an end thereof, a soft layer is formed on the outer peripheral surface of the pipe body, and the thick pipe is inserted through the male screw member. A thin pipe inserted into and out of the thin pipe, and a female screw member inserted through the thin pipe and screwable with the male screw member. The male screw member has a plurality of slits and is soft on the inner surface. A chuck portion in which a bite into the layer is formed, and the bite tooth has an annular shape whose inner diameter is smaller than the outer diameter of the thin pipe, while the female screw member is connected to the outer peripheral surface of the chuck portion on the inner surface. A means of forming a taper surface capable of reducing the diameter of the chuck portion by contact was used. That is, in the present invention, a biting tooth is added as a requirement to the conventional chuck configuration capable of reducing the diameter, and a soft layer is provided as a configuration of the thin pipe in order to further secure the biting fixation by the biting tooth. The biggest feature. In the present invention, the frictional tightening of the fine pipe by the chuck portion and the biting of the biting teeth into the soft layer act synergistically to firmly fix the fine pipe, and as a result, the load resistance is improved.
[0007]
In the present invention, the chuck portion is provided with a plurality of slits. As a result, if the chuck portion is formed of a flexible material such as plastic, the diameter of the chuck portion can be easily reduced, and if the female screw member is loosened, it returns to its original shape, and the shelf The position can be changed .
[0008]
According to the second aspect of the present invention , a means is used in which a soft layer is provided via an adhesive when the pipe body is drawn. According to this means, it is possible to coat the pipe body in a homogeneous state without peeling off the soft layer. Further, since the adhesive strength between the pipe body and the soft layer is ensured, even when a load is applied, peeling of the soft layer starting from the biting tooth is difficult to occur.
[0009]
Moreover, the means of providing a soft layer by shrink molding was used. According to this means, the soft layer can be provided more closely to the pipe body.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an embodiment in which the present invention is applied to a press-fitting shelf (a press-toll rack). In FIG. 1, reference numeral 1 denotes a shelf board, and 2 denotes a support leg that supports the shelf board 1. There are a total of four support legs 2, and each employs the telescopic structure 3 of the present invention. In addition, the support legs 2 have two sets of left and right as a set, and an opening preventing member 2a is installed on the front and rear support legs 2 and 2 respectively. Accordingly, it is possible to always hold the support leg 2 straight and to extend and retract the two front and rear support legs 2 and 2 connected by the opening preventing member 2a at the same length at the same time. This is effective when there is a step between the left and right support legs 2 when the main shelf is installed in the press-in. However, the opening preventing member 2a can be omitted.
[0011]
In addition, the shelf board 1 is detachably mounted on a horizontal beam (not shown) suspended between the left and right support legs 2 and 2, and the horizontal width is adjusted so that the horizontal beam can also be expanded and contracted. It is possible. In this case, the number of the shelf boards 1 to be placed is determined according to the length of the horizontal rail.
[0012]
FIG. 2 shows the internal structure of the stretchable structure 3. In the figure, 4 is a thick pipe as a lower structure of the support leg 2, and 5 is a thin pipe as an upper structure of the support leg 2. The thin pipe 5 has a two-layer structure in which a soft layer 5b such as vinyl chloride is formed on the outer peripheral surface of the pipe body 5a. However, the soft layer 5b may be made of any material other than vinyl chloride as long as the bite teeth 6h described below can bite into the material. Further, the method for forming the soft layer 5b is not particularly limited, but, for example, a method of shrink-molding the tube-like soft layer in the drawing manufacturing process of the pipe body 5a is common. In this case, after applying the adhesive to the pipe body 5a, if the soft layer 5b is shrink-molded, the shrink-molding of the soft layer can follow the drawing of the pipe body 5a, and a uniform coating is possible. Become. In this embodiment, the same two-layer structure is adopted for the thick pipe 4, but this is not essential in the present invention.
[0013]
A male screw member 6 is fitted and inserted into the upper end portion of the thick pipe 4, and a female screw member 7 that can be screwed into the male screw member 6 is inserted into the thin pipe 5. The screw member 6 is inserted through the thick pipe 4 so as to be freely inserted and removed.
[0014]
FIG. 3 is a detailed view of the male screw member 6. The male screw member 6 is a substantially circular member in which the knob portion 6a and the chuck portion 6b are integrated. The knob portion 6a has an inner diameter 6c that can be inserted into the thick pipe 4, and a reduced diameter step portion 6d is formed at the boundary with the chuck portion 6b. On the other hand, the chuck portion 6b has an inner diameter through which the thin pipe 5 can be inserted in a normal state, and a male screw 6e is engraved on the lower outer surface thereof. Further, a plurality of slits 6f are formed in the vertical direction from the upper end of the chuck portion 6b over a certain length, and the chuck portion 6b has a structure capable of elastically reducing the diameter. Further, a taper surface 6g is formed on the upper outer surface of the chuck portion 6b, and a relatively sharp annular biting tooth 6h is directed inwardly on the inner surface of the taper surface 6g, that is, on the upper inner surface of the chuck portion 6b. Projecting. The chuck portion 6b has a small inner diameter only at the biting tooth 6h, but even if the inner diameter is smaller than the outer diameter of the thin pipe 5 in a normal state, the thin pipe 5 can be inserted. . This is because the diameter of the chuck portion 6b can be elastically increased by the slit 6f when the thin pipe 5 is inserted. In this case, since the thin pipe 5 receives the frictional force due to the biting teeth 6h, it is possible to avoid the thin pipe 5 from rapidly expanding and contracting when the shelf position is changed.
[0015]
FIG. 4 is a detailed view of the female screw member 7. The female screw member 7 has a female screw 7a that can be screwed with the male screw 6e of the male screw member 6 described above on the lower inner surface thereof, and a tapered surface 7b formed on the upper inner surface. The tapered surface 7b is formed at an angle capable of reducing the diameter of the chuck portion 6b by matching with the tapered surface 6g formed on the upper outer surface of the chuck portion 6b.
[0016]
As shown in FIG. 5, knurls 8 are formed on the knob 6 a of the male screw member 6 and the outer surface of the female screw member 7.
[0017]
Returning to FIG. 2, the operational effects of the telescopic structure 3 having the above-described configuration will be described in accordance with the method of use. First, the male screw member 6 is inserted into the upper end portion of the thick pipe 4, and the female screw member 7 is inserted into the thin pipe 5, and the thin pipe 5 is inserted into the thick pipe 4 in this state. . When the protruding length of the thin pipe 5 (height position of the shelf board 1) is determined, the female screw member 7 is screwed into the male screw member 6. Then, as the female screw member 7 is tightened, the inner surface tapered surface 7b matches the outer surface tapered portion 6g of the chuck portion 6b, and the diameter of the chuck portion 6b is reduced. When the female screw member 7 is completely tightened, the degree of diameter reduction of the chuck portion 6b becomes the largest, the biting teeth 6h bite into the soft layer 5b of the thin pipe 5, and the thin pipe 5 is firmly fixed. The At this time, the thin pipe 5 is also fixed by the frictional force between the inner surface of the chuck portion 6b and the soft layer 5b. The load capacity of the shelf can be increased. Conversely, if the female screw member 7 is loosened, the chuck portion 6b is restored to its original diameter due to its flexibility, and the bite teeth 6h are released from the soft layer 5b. Of course, the height can be adjusted.
[0018]
In the present invention, the number of biting teeth 6h and slits 6f is not limited to that of the present embodiment. Further, in the present embodiment, the present invention is applied to the support legs of the shelf. However, other articles may be used, and further, a member that expands and contracts in the horizontal direction (for example, a horizontal rail of the shelf in the present embodiment). Can also be applied. In short, the target member may be any member in which the thin pipe 5 is inserted into the thick pipe 4 so as to be freely inserted and removed.
[0019]
【The invention's effect】
As described above, according to the present invention, the biting teeth are formed on the chuck portion that can be reduced in diameter by tightening the female screw member, and the thin pipe is provided with a soft layer, and the fine pipe has the biting teeth that are the soft layer. Since it was fixed by biting into the load, the load resistance could be increased.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of a storage shelf to which the present invention is applied. FIG. 2 is a detailed sectional view of a telescopic structure (screwed state).
3 is a detailed cross-sectional view of a male screw member. FIG. 4 is a detailed cross-sectional view of a female screw member. FIG. 5 is an external view of a telescopic structure (screwed state).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shelf plate 2 Support leg 3 Elastic structure 4 Thick pipe 5 Thin pipe 5a Pipe body 5b Soft layer 6 Male screw member 6a Knob part 6b Chuck part 6c Inner diameter 6d Step part 6e Male screw 6f Slit 6g Tapered surface 6ch of the chuck part Biting teeth 7 Female thread member 7a Female thread 7b Tapered surface 8 Knurl

Claims (3)

A thick pipe provided with a cylindrical male screw member at the end, a thin pipe formed with a soft layer on the outer peripheral surface of the pipe body, and inserted through the male screw member into and out of the thick pipe, A chuck portion that is inserted into the thin pipe and includes a female screw member that can be screwed with the male screw member, the male screw member having a plurality of slits, and an inner surface formed with a bite into the soft layer And the bite teeth have an annular shape whose inner diameter is smaller than the outer diameter of the thin pipe, while the female screw member abuts the outer peripheral surface of the chuck portion on the inner surface and can reduce the diameter of the chuck portion. A telescopic structure such as a shelf foot, characterized by forming a tapered surface.   The stretchable structure such as a shelf foot according to claim 1, wherein the soft layer is closely attached via an adhesive when the pipe body is drawn.   The stretchable structure such as a shelf foot according to claim 1 or 2, wherein the soft layer is provided by shrink molding.

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