JPH0337344Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention mainly relates to an improvement of a folding structure used as a portable stage.

[Prior art]

In general, for a folding type portable stage, care must be taken so that when a pair of left and right stage top plates are unfolded, there will be no gap between adjacent stage top plates. For this reason, in conventional stages of this type, each stage top plate is supported by a base via a link mechanism, and the folding and unfolding operations of each stage top plate are smoothly performed by the motion of the link mechanism. between the unfolded stage top plates.
I try to avoid any gaps.

[Problems with conventional technology]

However, since the conventional stage described above requires a complicated link mechanism, the number of parts increases, making the assembly work of the stage complicated, and the stage as a whole becomes heavier and costs increase. It was hot.

[Purpose of invention]

This idea was made to solve the above problems, eliminating the need for a link mechanism and reducing the number of parts.
It is an object of the present invention to provide a half-folding type folding structure that saves labor in assembly work and simplifies the configuration, and also prevents gaps from occurring between top plates when unfolded.

[Structure of the idea]

In order to achieve the above-mentioned purpose, this invention consists of a central base, a horizontal unfolded position where they are pivoted to be able to move up and down on the base, and are adjacent to each other on the same plane, and a folded position where they are folded in the middle and are in an upright position. A pair of top plate support frames that can be freely rotated, a top plate that is stretched on each of the frames, and a top plate that is provided on each of the frames at separated positions sandwiching the base and is foldable. In the center-folding structure having a pedestal, each of the top plates has a hole chamber whose lower surface side is open at opposite ends of the top plates corresponding to the pivot positions of the base and the top plate support frame. The present invention is characterized by a structure of a half-folding type folding structure in which a pivoting position of a top support frame and a base is set within the hole.

【Example】

Hereinafter, preferred embodiments of this invention will be described based on the drawings. The portable stage, which is illustrated as a center-folding structure in FIG. 1, is equipped with a base 1 at its center. The base 1 has four pillars 1 as shown in more detail in Figure 2.
-1 to 1-4. Each of the struts 1-1 to 1-4 includes upward brackets 2-1 to 2-4 that are integrally provided on the upper end side and extend diagonally upward inwardly, and an outwardly facing bracket 2-1 to 2-4 that is provided at a spaced apart position on the lower side of the bracket. It has horizontal brackets 3-1 to 3-4 that extend to. And the upward brackets 2-1 to 2-4
A pair of left and right top plate support frames (hereinafter abbreviated as frames) 4 and 5 adjacent to each other are pivotally supported so as to be foldable and unfoldable. More specifically, as is more clearly seen in FIGS. 3 and 4, each of the frames 4 and 5 has gusset plates 6 to 9 that protrude upward near their opposing ends and are integrally formed by welding or other means. It is set up as follows. The upper end sides of those gazette plates 6 to 9 are connected to the above-mentioned upward brackets 2-1 to 2-4 by pivot pins P.
It is rotatably supported at points 1 to P4. As a result, the opposing ends of each of the frames 4 and 5 are supported by the base 1. The outer end side of each frame 4, 5 is a pillar 10-1 to 1
It is now accepted as 0-4. The upper ends of the pillars 10-1 to 10-4 are rotatably supported on the outer end sides of the frames 4 and 5 by pivot pins P5 to P8. Then, the midway portions of each of the pillars 10-1 to 10-4 and the horizontal brackets 3-1 to 3-4 of the base 1 are connected to the pivot pins P9 to P16 (P1) by the stays 11 to 14.
11, P12, P15, and P16). In this case, each stay 11 to 14 is a pillar 10-1.
It is mounted between the pillar and the horizontal brackets 3-1 to 3-4 so as to be inclined gradually downward toward the 10-4 side. Further, coil-shaped springs 15 to 18 are installed between the vicinity of the upper end of each of the pillars 10-1 to 10-4 and the intermediate portion of each of the frames 4 and 5. In this case, the springs 15 to 18 are connected to the pillar 10.
-1 to 10-4, the pivot pins P5 to P8 at the upper ends of the pillars and the pivot pins P9 to P9 of the stays 11 to 14
P16, and is connected to the frames 4 and 5 via a tension adjusting means 19 such as a turnbuckle. In the frame structure of the portable stage as described above, stage top plates (hereinafter abbreviated as top plates) 20 and 21 are stretched over each frame 4 and 5, respectively. Hole chambers 22 to 25 are provided at positions corresponding to the upward brackets 2-1 to 2-4 on the base 1 side, respectively, near the opposing ends of the top plates 20 and 21 in the unfolded state. . The illustrated hole chambers 22 to 25 are made up of through holes, as shown in more detail in FIG. 3, and their upper openings are closed by caps 26. The cap 26 is fixed to each of the top plates 20 and 21 flush with the surfaces thereof by means of screws, adhesive, or the like. Pivot pins P1 to P4 for the upward brackets 2-1 to 2-4 and the gusset plates 6 to 9 on the frames 4 and 5 are arranged inside each of the hole chambers 22 to 25, respectively. There is. Therefore, when the frames 4 and 5 are folded and unfolded, the pivot points are set within the thickness of the top plates 20 and 21. Furthermore, tapered surfaces 20a and 21a (see FIG. 3) are formed on opposing end surfaces of the top plates 20 and 21 when they are unfolded, forming a void that gradually becomes wider on the lower side. These tapered surfaces 20a and 21a are the top plate 2.
Frame 4, by mutual facing surface connection
This prevents the folding and unfolding operation of No. 5 from being blocked. Next, the operation of the above embodiment will be explained. When the top plates 20, 21 or the outer ends of the frames 4, 5 are lifted in the unfolded state of the stage shown in FIG. Each rises and rotates. Accordingly, the stays 11 to 14 follow and rotate in the upward direction about the pivot pins P11, P12, P15, and P16 on the base 1 side, respectively. In this case, each of the pivot pins P9, P10 and P13, P14 on the pillar side of the stays 11 to 14 moves upward from the horizontal line L passing through the centers of the base end pivot pins P11, P12 and P15, P16 of the stays 11 to 14. , each of the pillars 10-1 to 10-4 rotates around the pivot pins P5 to P8 on the frames 4 and 5 side by the tensile force of the springs 15 to 18. Thus, together with the top plates 20 and 21, the frame 4,
5 is folded into an upright state as shown in FIG.
Each of 1 to 10-4 is also attached to the top plate 2 as shown in the same figure.
0 and 21 are folded along the frames 4 and 5. During the folding process, springs 15 to 18
The pillars 10-1 to 10-4 subjected to the action are gradually folded following the rotation of the stays 11 to 14. Therefore, there is no risk that the pillars 10-1 to 10-4 will be suddenly folded due to the action of the springs 15 to 18. Therefore, if the frames 4 and 5 are opened and lowered together with the top plates 20 and 21 from the above-mentioned folded state, each of the stays 11 to 14 and the pillars 10-1 to 10-4 will be moved when the stage is folded. Follows rotation in the opposite direction to the case of . With this, the top plates 20, 21 and the frame 4,
5 and stays 11 to 14 and pillars 10-1 to 10
-4 are expanded into a state as shown in FIG. That is, at the time of deployment, each stay 11 to 14 follows and rotates via the pillars 10-1 to 10-4 as the frames 4 and 5 rotate and descend, so the stays 11 to 14 are rotated downward by the rotation of the frames 4 and 5. 1 to 10-4 are pushed open against springs 15 to 18. Motsu, top plates 20, 21 and frames 4, 5
At the same time, the pillars 10-1 to 10-4 are also expanded. In its fully expanded state, each of the pivot pins P9, P10 and P13, P14 of the pedestal and stay exceeds the horizontal line L below, so that each pedestal 10-1 to 10-4 has a spring 15 to 18, there is no fear that it will bend excessively. Note that the center-folding structure of this invention is not limited to the portable stage as in the above embodiment, but may be other types of tables, for example, and may be modified in various ways without changing the gist of the invention. be able to. In FIGS. 1, 3, and 5, the reference numeral 27 indicates a caster provided on the base 1, and the reference numeral 28 indicates an outrigger provided on the base 1.

[Effect of the idea]

As described above, in this invention, the pivot pin of the top plate support frame relative to the base is housed in the hole provided in the top plate, and the pivot pin of the top plate support frame is set within the thickness of the top plate. The pair of top plates can be smoothly extended without any need for a complicated link mechanism. Therefore, the number of parts corresponding to the link mechanism and its related parts can be reduced, and accordingly, the assembly work can be labor-saving and the configuration can be simplified, which greatly contributes to cost reduction.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the unfolded state of a portable stage according to a preferred embodiment of this invention, Fig. 2 is a perspective view showing the base of the stage, Fig. 3 is an enlarged sectional view of the main parts, and Fig. 4 The figure is a sectional view taken along the - line in FIG. 3, and FIG. 5 is a front view showing the portable stage in a folded state. 1...Base, 4...One top plate support frame,
5...Other top plate support frame, 10-1 to 4...
... Pillar, 20... One top plate, 21... Other top plate, 22-25... Hole chamber, P1-P4... Pivot pin.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A central base and a central base that is pivoted on the base so that it can move up and down, and that are adjacent to each other on the same plane and can be placed in a horizontal unfolded position or a folded upright position. A pair of top plate support frames that can be rotated to and from the tatami position, a top plate that is stretched on each of the frames, and a top plate that is provided on each of the frames at separate positions sandwiching the base and is foldable. In the center-folding structure, each of the top plates has a hole that opens on the lower side at opposite ends of the top plates, corresponding to the pivot position between the base and the top plate support frame. 1. A mid-folding type folding structure, characterized in that a chamber is provided, and a pivot position for a top plate support frame and a base is set within the hole chamber. (2) The base has a frame structure and integrally has an upwardly facing bracket on the upper end side, and an upwardly facing gusset plate integrally formed with the top support frame is pivotally supported by the bracket within the hole chamber. 1. A center-folding structure according to claim (1) of claim 1, characterized in that: (3) The scope of the utility model registration claim, characterized in that the mutually opposing surfaces of the top plates that are in a joined state when unfolded are provided with tapered surfaces that form a void that gradually becomes wider at the bottom. The mid-folding structure described in paragraph (1).