JPH029005Y2 - - 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]

A conventional foldable portable stage consists of a central underframe, a pair of left and right top support frames that are pivotally supported to the underframe via a link mechanism so as to be able to rotate up and down, and a structure that is stretched between these frames. The stage top plate includes a stage top plate, a pedestal whose upper end is pivotally supported by each of the top plate support frames, and a stay installed between the pedestal and the top plate support frame. Then, by folding the top plate support frame into a half-folded upright state and unfolding it from the folded position to a horizontal position, the pillars are inevitably folded and unfolded via the stays.

[Problems with conventional technology]

However, in the case of the above-mentioned conventional technology, since the pedestal is linked to the top plate support frame only by the stay, there is a problem that the pedestal does not follow smoothly when the frame is folded and unfolded, and There was a problem in that the stability of the pillars in the folded and unfolded positions was likely to be impaired.

[Purpose of invention]

This idea was made in view of the above circumstances,
The purpose was to improve operability by making the pedestal follow smoothly when the top support frame is folded and unfolded, and to provide stability in the folded and unfolded position of the pedestal. It is intended to provide a folding structure.

[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 are rotatably displaceable; a top plate that is stretched on each of the frames; and a folding device that has an upper end pivotally supported on each of the frames at a spaced apart position sandwiching the base. - A medium having a freely deployable pedestal and a stay that spans between the pedestal and the base and is pivoted thereto so as to be gradually inclined downward toward the pedestal when the top support frame is deployed. In the foldable folding structure, a spring is applied between the pedestal and the top support frame, and the connection point of the spring on the pedestal side corresponds to the pivot position of the pedestal and the top support frame. The spring is set between the pivot position with the stay, and the spring is arranged in an inclined manner so that the connection point on the pillar side of the spring is located below the connection point on the top support frame side when the top support frame is deployed. A technical measure is taken to bias the pillars in the folding direction.

【Example】

Hereinafter, preferred embodiments of this invention will be described based on the drawings. The portable stage illustrated as a center-folding structure in FIG. 1 includes 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 has an upward bracket 2-1 to 2-4 that is integrally provided on the upper end side and extends diagonally upward inward, and an outer bracket 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 upward brackets 2-1 to 2-4 with pins P1 to P1.
It is rotatably supported at 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 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. Further, 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 to form a gap 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 by 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, the stays 11 to 14 and the pillars 10-1 to 10-4 will each move 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. In the above embodiment, the base 1 and the frame 4,
Since the pivot pins P1 to P4 of No. 5 are set within the hole chambers 22 to 25, that is, within the thickness of the top plates 20 and 21,
The top plates 20 and 21 can be smoothly unfolded without any gaps. Therefore, there is no need to use a complicated link mechanism in order to unfold the pair of left and right top plates without any gaps, and the number of parts can be reduced, labor saving in assembly work can be achieved, and this can greatly contribute to cost reduction. 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, reference numeral 26 indicates a caster provided on the base 1, and 27 indicates an outrigger also provided on the base 1.

[Effect of the idea]

Hereinafter, according to this invention, the pillars, which are folded and unfolded together with the frame following the folding and unfolding operations of the top support frame, are always urged in the folding direction by the springs via the stays. Therefore, when the top support frame is folded and unfolded, the pillars can be smoothly followed. This improves the operability when folding and unfolding simple folding stages and tables, and the action of the springs allows the pillars to be folded and unfolded.
It can be reliably stabilized in the deployed position, greatly contributing to improved safety.

[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, FIG. 5 is a front view showing the portable stage in a folded state, and FIG. 6 is an enlarged explanatory view of the spring tensioned portion in the folded state. 1...Base, 4...One top plate support frame,
5...Other top plate support frame, 10-1 to 4...
...Pole, 11-14...Stay, 15-18...
Spring, 20...one top plate, 21...other top plate.

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 stretched on each of the frames, and an upper end pivoted to each of the frames at a spaced apart position sandwiching the base. A pedestal that can be folded and expanded freely, and a stay that extends between the pedestal and the base and is pivoted thereto so as to be gradually inclined downward toward the pedestal when the top support frame is expanded. In the center-folding structure, a spring is hung between the pedestal and the top support frame, and the connection point of the spring on the pedestal side is located between the pivot position of the pedestal and the top support frame and the foot. The spring is set between the pivot point of the column and the stay, and the spring is tilted so that when the top support frame is deployed, the connection point on the pillar side of the spring is located below the connection point on the top support frame side. A mid-fold type folding structure characterized by arranging pillars and urging them in a folding direction. (2) The center-folding structure according to claim 1, wherein the spring has a tension adjustment means. (3) Each top plate has a hole chamber whose bottom side opens at a position corresponding to the pivot position of the top plate support flume with respect to the base, and the pivot pin is arranged in the hole chamber to support the top plate support frame. The folding structure according to claim 1, which is a utility model, and is pivoted on a base. (4) 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. 3. A center-folding type folding structure according to claim 1 or 3, characterized in that: (5) Utility model registration claim No. 1, 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 gap that gradually becomes wider on the lower side. The middle-folding structure according to item 1.