JPH029007Y2 - - Google Patents

Description

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

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

[Prior art]

In general, a folding type portable stage has a pair of top plate support frames pivoted on the top of a central support so that they can move up and down, and the top plates attached to the frames are placed horizontally on the same plane and adjacent to each other. It is configured to be rotatably displaced between an unfolded position and a folded position in which it is folded in the middle and becomes an upright state.

[Problems with conventional technology]

In a stage with such a configuration, if the pair of left and right top plates were folded together with the top plate support frame into the upright position as described above, and left as they were, the top plates would fall in the unfolding direction, causing an accident. There is a lot of fear that it will cause this.

[Purpose of invention]

This idea was made in view of the above circumstances,
It is an object of the present invention to provide a folding structure whose purpose is to prevent a top plate in a folded state from falling over.

[Structure of the idea]

In order to achieve the above object, this invention includes a central support, a pair of top plate support frames each supported on the upper side thereof, a top plate stretched on each of the frames, and an upper end of which is pivoted on the frame. A support leg that is supported to support the frame and the top plate between the central support body, and a support leg that is mounted between the support leg and the center support body to cause the support leg to follow the top plate and perform folding and unfolding operations. a link bar, and is configured to rotationally displace the top plates between a horizontal unfolded position where they are adjacent to each other on the same plane and a folded position where they are folded upright, a handle provided on a horizontal member that integrally connects the support legs of each top plate; a guide portion for introducing the handle against elastic force when the top plate is folded; A technical measure is taken in which the handle is provided with a locking part for chucking the handle, and a locking member capable of unlocking the handle by displacing the locking part against an elastic force.

【Example】

Hereinafter, preferred embodiments of this invention will be described based on the drawings. The portable stage illustrated in FIGS. 1 to 3 as a folding structure of a folding type is provided with a central support 1 for supporting the folding side thereof. The central support 1 in the illustrated example has horizontal members 2,
It has a frame structure having hollow pillars 4 and 5 integrally connected by 3 at the corners of a rectangular plane. The hollow pillars 4 and 5 have upwardly facing brackets 6 and 7 that are integrally provided on the upper end side and extend diagonally upward inwardly, and integrally protrude outwardly at a spaced apart position on the lower side of the brackets. It has horizontal brackets 8, 9 and casters 10, 11 installed at positions spaced below them. Each of the hollow pillars 4 and 5 has an elevating leg 1 inside.
2 and 13 are penetrated. The elevating legs 12, 13 have flanges 12A, 13A integrally formed at the upper ends of the hollow pillars 4, 5 protruding from the hollow pillars 4, 5, as shown in more detail in FIGS. 4 to 6. It has leg members 12B and 13B screwed together at the lower end so that the height can be adjusted. The flanges 12A, 13A are the lifting legs 12, 13.
It serves as a means for engaging and disengaging the upper ends of the hollow legs 4, 5 by the vertical movement of the vertical legs 12, 13, and the vertical movement of the vertical legs 12, 13 is directed in a direction that is not obstructed by the upward brackets 6, 7. It extends horizontally. On the other hand, the upward brackets 6 and 7 have a pair of left and right top support frames (hereinafter referred to as frames) 14 and 15 that are adjacent to each other and are foldable.
It is supported so that it can be expanded freely. More specifically, each of the frames 14 and 15 has connecting pieces 16 and 17 (see FIGS. 4 to 6) that protrude upward in the vicinity of the opposite ends when they are deployed, by means of welding or the like. It is integrally installed. The upper end sides of these connecting pieces 16, 17 are rotatably supported on the upward brackets 6, 7 by pins P1, P2. As a result, the folded sides of each frame 14, 15 are pivoted to the central support 1, and their pivot points (pins) P1, P2 are connected to the hollow pillars 4, 5 and the frame 1.
4 and 15 respectively. In addition, the frames 14 and 15 have lifting legs 12 and 13.
It has means 22, 23 for engaging the upper surfaces of the upper end flanges 12A, 13A, and means 24, 25 for pushing up the elevating legs 12, 13. The engagement means 22, 23 in the illustrated example are the frame 14,
It consists of an angle member whose base end is welded to each inner surface of the frame 15, and one of the angle members is used as engagement piece portions 22A and 23A which are press-fitted onto the flanges 12A and 13A at the unfolded position of the frames 14 and 15, The other pieces are bent pieces 22B and 23B that hang down along the outer surfaces of the hollow pillars 4 and 5 in the expanded position. Each of the bent pieces 22B and 23B has a fourth
The set screws 26 and 27 are screwed together as shown in detail in FIGS. 5 and 7. These set screws 26 and 27 serve as stopper means for bringing the frames 14 and 15 into abutment against the respective outer surfaces of the hollow pillars 4 and 5 at the deployed position, and their stopper function allows the frames 14 and 15 to be placed in the deployed position. It is possible to prevent rattling between the frames 14, 15 and the central support 1 in advance and reliably. On the other hand, the push-up means 24 and 25
It consists of an engagement pin whose proximal end side is welded to the lower surface of the frames 14, 15 directly below the frames 14, 17, and is engaged with and disengaged from the lower surfaces of the flanges 12A, 13A by rotation of the frames. The outer ends of the frames 14 and 15 are supported by foldable support legs 18 and 19. The upper ends of the supporting legs 18 and 19 are rotatably supported on the outer end sides of the frames 14 and 15 by pins P3 and P4. Further, as shown in FIG. 3, the supporting legs 18 and 18 and the supporting legs 19 and 19 are connected by horizontal members 28 and 29. Handles 30 and 31 for operating the top plate are integrally connected to intermediate portions of the horizontal members 28 and 29, respectively. The illustrated handles 30 and 31 are attached to the frames 14 and 15.
It consists of a U-shaped bent rod that hangs down in the deployed position. Each of the support legs 18 and 19 is connected between its midway portion and the horizontal brackets 8 and 9 of the central support 1 by link bars 20 and 21 via pivot pins P5 and P6. In this case, the link bars 20, 21 are connected to the supporting legs 18,
The support leg is horizontally suspended between the support leg and horizontal brackets 8 and 9 so as to be inclined gradually downward toward the 19 side. In the frame structure of the portable stage as described above, stage top plates (hereinafter referred to as top plates) 32 and 33 are stretched over each frame 14 and 15, respectively. Hole chambers 34 and 35 are provided near the opposing ends of the top plates 32 and 33 in the unfolded state at positions corresponding to the upward brackets 6 and 7 on the central support 1 side, respectively. The hole chambers 34 and 35 in the illustrated example consist of through holes, as shown in more detail in FIGS. 4 and 6, and their upper end openings are closed with a cap 36. The cap 36 is fixed to each of the top plates 32 and 33 flush with the surfaces thereof by means such as screws or adhesive. Inside each of the hole chambers 34 and 35 are upward brackets 6 and 7 and a frame 1.
Pivot points for connecting pieces 16 and 17 on the 4 and 15 sides, so-called pivot pins P1 and P2, are accommodated, respectively. Therefore, the pivot points P1 and P2 when the frames 14 and 15 are folded and unfolded are set within the thickness of the top plates 32 and 33. Further, tapered surfaces 32a and 33a (see FIG. 4) are formed on opposing end surfaces of the top plates 32 and 33 when they are unfolded to form a gap that gradually becomes wider on the lower side. These tapered surfaces 32a and 33a are
2, 33 Frame 1 by mutual facing connection
This prevents the folding and unfolding operations of Nos. 4 and 15 from being blocked. Further, as shown in FIGS. 2 and 3, the top plates 32 and 33 are provided with locking means 37 and 38 for locking the top plates and the frames 14 and 15 together in the folded position.
on the back of each. The illustrated locking means 37 and 38 are located on the top plate at positions corresponding to the handles 30 and 31 when the top plate is folded.
It has a bracket 39 fixed to the back surface of each of the parts 2 and 33. The bracket 39, as shown in more detail in FIGS. 8 and 9, is a member having a channel-shaped cross section with bracket pieces 39A and 39B on both sides. Lock members 4 are attached to the bracket pieces 39A and 39B.
0 is rotatably supported via a pin 41. The locking member 40 is made of a bent plate, and includes a locking piece 40A that presses and chucks the horizontal rod portions of the handles 30 and 31 against the back sides of the top plates 32 and 33 when the top plate is folded. It consists of a guide piece 40B extending outward from the tip of the hooking piece and slanting downward, and a bent piece 40C formed on the tip side of the guide piece. The locking member 40 is constantly biased by a spring member 42 (see FIG. 9) in the direction in which the locking piece 40A chucks the handles 30, 31. Therefore, the handles 30 and 31 are connected to the lock member 40.
Also serves as a lock receiving element. Next, the operation of the above embodiment will be explained. In the stage unfolded state shown in FIG.
The foot members 12B and 13B of 3 touch the ground and the caster 1
0 and 11 are in a raised state, and the reason for this will become clear as will be explained later. From such a stage development state, the top plates 32 and 33
Alternatively, when the outer ends of the frames 14, 15 are lifted, the frames 14, 15 rotate upward around the pivot pins P1, P2 in the hole chambers 34, 35, respectively. During the rotation, as shown on the left side in FIG. 4 and in FIG.
The upper end flanges 12A and 13A are floated away from the upper end flanges 12A and 13A. As a result, the central support body 1 including the hollow pedestals 4 and 5 descends under its own weight using the elevating legs 12 and 13 as guides, and each caster 10 and 11 comes into contact with the ground. At this point, the foot members 12B, 13B and the casters 10, 11 are both in contact with the ground. However, the frames 14 and 15 as described above
Since the upward rotation continues, this time the push-up means 2
4 and 25 are upper end flanges 12 of the lifting legs 12 and 13
It collides with the lower surfaces of A and 13A and pushes them up. Eventually, as the elevating legs 12 and 13 rise, the foot members 12B and 13B rise from the ground surface, and the casters 10 and 11 come into complete contact with the ground. Furthermore, when the flanges 14 and 15 rotate upward, the link bars 20 and 21 follow and rotate in the upward direction about the pivot pin P6 on the central support 1 side. In this case, the supporting legs 18 of the link bars 20, 21,
The pivot pin P5 on the 19 side is connected to the link bars 20, 2.
When passing through the center of the base end pivot pin P6 of 1 and passing above the horizontal line, each support leg 18, 19 connects to the frame 14,
Center the top plate 3 around the pivot pins P3 and P4 on the 15 side.
It is folded in the direction along the back surface of 2 and 33. During the folding process, when the handles 30, 31 approach the back surfaces of the top plates 32, 33, the horizontal bar portions at the ends of the handles ride on the guide piece 40B of the lock member 40. As a result, the handles 30, 31 move over the guide piece 40B while rotating the lock member 40 against the spring member 42. Then, the locking member 40 is rotated to its original position by the force of the spring member 42, so that the locking piece 40A is attached to the handle 3.
Chaking 0,31. Therefore, the top plates 32, 33 and the frames 14, 15
is automatically locked at the same time as it is folded into the upright position shown in FIG. For this reason, the top plates 32, 33 and the frames 14, 1
5, there is no danger of it falling over in the folded state, and it is held reliably and stably. Moreover, in the folded state, the leg member 12
Since B and 13B are completely raised from the ground surface, the stage can be moved smoothly when not in use. Next, when unfolding the folded stage, the handles 30 and 31 are unlocked by rotating the locking member 40 against the spring member 42. Therefore, if the top plates 32 and 33 are opened mutually,
Together with the link bars 20 and 21, the supporting legs 18 and 19 each follow and rotate in the opposite direction to that when the stage is folded. At the same time, the push-up means 24 and 25 descend, so
The lifting legs 12 and 13 descend under their own weight, and the leg member 12B,
13B is grounded. After the ground contact, the engaging means 22, 2
The engaging pieces 22A and 23A of 3 are the lifting legs 12 and 13.
It abuts against the upper end flanges 12A, 13A. At this point, the top plates 32 and 33 are still continuing to rotate downward. For this reason, the upward brackets 6 and 7 and the connecting piece 1
The pivot pins P1 and P2 for the lift legs 12 and 17 move up using the upper end flanges 12A and 13A of the lifting legs 12 and 13 that are in contact with the ground as fulcrums. Due to the rise, the hollow pillars 4 and 5 are lifted, and each of the casters 10 and 11 is completely lifted off the ground surface. Therefore, when the stage is fully expanded as shown in Fig. 1, the casters 10 and 11 are raised as described above, so that the stage is kept in a stable state without moving undesirably and can be used. It will be done. Further, in the above embodiment, the frame 14,
Pivot points P1, P2 on the central support 1 side of 15
are set within the hole chambers 34, 35, that is, within the plate thickness of the top plates 32, 33, and the tapered surfaces 32a, 33a are formed at the butting ends when the top plates are unfolded, so that the top plates 32, 33 They can be developed smoothly 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 between them, and the number of parts can be reduced, labor savings in assembly work can be achieved, and this greatly contributes to cost reduction. The center-folding structure of this invention is not limited to the portable stage as in the above-mentioned embodiments, but may also be other types of center-folding tables, and may be modified in various ways without changing the gist. It can be implemented by

[Effect of the idea]

As described above, according to this invention, when the top plate is folded, the lock receiving element on the support leg side is automatically chucked by the locking means on the top plate side, so that the lock receiving element on the support leg side is automatically chucked by the locking means on the top plate side. The top plate can be reliably and firmly automatically locked in the folded position. Therefore, there is no danger that the top plate in the folded state will fall over, which greatly contributes to improving the safety in using and storing this type of structure.

[Brief explanation of drawings]

FIG. 1 is a front view showing a portable stage according to a preferred embodiment of this invention in an unfolded state, FIG. 2 is a partially cutaway front view of the portable stage in a folded state, and FIG.
The figure is a side view of the folded state, FIG. 4 is an enlarged front view with a part of the stage center support in section, and FIG. 5 is an explanatory diagram showing the related structure of the center support and the top plate support frame. Figure 6 is a sectional view taken along the - line in Figure 5;
7 is a sectional view taken along the line -- in FIG. 5, FIG. 8 is a front view of the bracket of the locking means, and FIG. 9 is a side view of the locking means. 1...Central support body, 14...Top plate support frame, 1
5... Top plate support frame, 18... Support leg, 19... Support leg, 20... Link bar, 21... Link bar, 30
...Handle, 31...Handle, 32...Top plate, 33...Top plate,
37... Locking means, 38... Locking means.

Claims (1)

[Claims for Utility Model Registration] A central support, a pair of top plate support frames each supported on the upper side thereof, a top plate stretched over each of the frames, and an upper end pivoted to the frame. a supporting leg that supports the frame and the top plate between the central support; and a supporting leg that is installed between the supporting leg and the central support and allows the supporting leg to follow the top plate and perform folding and unfolding operations. a link bar, and is configured to rotationally displace the top plates between a horizontal unfolded position where the top plates are adjacent to each other on the same plane and a folded position where the top plates are folded and stand up; A handle provided on a horizontal member that integrally connects the supporting legs of each plate; a guide portion that introduces the handle against elastic force when the top plate is folded; and the handle that passes through the guide portion. A half-folding type folding structure, characterized in that it has a latch part for chucking the handle, and a locking member that can unlock the handle by displacing the latch part against elastic force. body.