JPS6221950B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a foldable stage used in gymnasiums, community centers, and other various venues.

Many of the folding stages conventionally used at various venues are known as the one shown in Publication No. 7591 of 1972. In this system, a plurality of legs having wheels at the lower part of both sides are arranged in the front and back direction, and these legs are connected to each other by a pantograph so that they can move toward and away from each other within a predetermined range, and the upper part of each of the legs is bent. A set of two front and rear footboards are pivotally connected so that each pair of front and rear footboards can be folded into a mountain shape or expanded into a flat shape as the legs move toward and away from each other. The structure is such that they are supported in a balanced manner. However, when the above-mentioned conventional device is folded from the unfolded state, if the worker simply pushes the legs from the front, each set of legs is spread out flatly above each leg. Each set of treadboards cannot be properly bent into a mountain shape, and for this reason, workers must lift each set of two treadboards by hand to an appropriate angle of inclination. It cannot be bent into a shape and folded, and therefore, if it is long and has a large number of legs arranged, the folding operation is extremely troublesome and extremely difficult for one worker to do.

This invention was made in view of the above circumstances, and its purpose is to bend the front and rear treads into a mountain shape by lifting them by hand to an appropriate inclination angle when folding the front and rear treads. Once this is done, the worker can simply compress the legs one by one from the front, and from the second onwards, the front and rear treads of each set will automatically bend into a mountain shape, and the entire body will be The object of the present invention is to provide a foldable stage that can be folded very easily and has excellent workability.

An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1a, 1b, 1c, and 1d are legs arranged in the front-rear direction, and these are each composed of a cross beam 2 and both side and intermediate supports 3, 4, and 5 erected above the cross beam 2. Wheels 6 such as casters are attached to the lower portions of both sides. Further, the legs 1a to 1d, which are adjacent to each other in the front and back, are connected to each other so as to be movable toward and away from each other within a predetermined range by a pantograph 7 disposed between the support columns 3, 3, 4, and 4 on both sides. . Furthermore, the legs 1a to 1d
At the upper part of each space between the
a, 8b, 9a, 9b, 10a, and 10b are supported, respectively. That is, a set of two treadboards 8a, 8b, 9a, 9b and 10a, 10b on each front and rear.
are horizontally long plate-like objects arranged in parallel with each other, and have both side and intermediate support frames 11a, 12a, 1 on the lower surface, respectively.
3a, 11b, 12b, 13b are fixed, and for each set, both the front and rear sides and the intermediate support frame 1 are fixed.
1a and 11b, 12a and 12b, 13a and 13b
By engaging each opposing side end with the pin 14..., each pair of front and rear tread plates 8a and 8b, 9a and 9b, 10a and 10 are connected around the pin 14...
b are pivotally connected to each other so that they can be bent. In addition, both sides of the front treads 8a, 9a, 10a of each set and the front ends of the intermediate support frames 11a, 12a, 13a, both sides of the legs 1a, 1b, 1c arranged on the front side, and the upper ends of the intermediate supports 3, 4, 5 The mounting brackets 15 and pins 16 are pivotally connected to each other so that both sides of the rear footboards 8b, 9b, 10b and the rear ends of the intermediate support frames 11b, 12b, 13b are connected to each other. Mounting hardware 17 is attached to both sides of the legs 1b, 1c, and 1d arranged on the rear side and to the upper ends of the intermediate struts 3, 4, and 5.
and pins 18..., so that each set of two tread plates 8a, 8
b, 9a, 9b, 10a, 10b are arranged one set at the front and back, 1a and 1b, 1b and 1c, 1c and 1
They are supported so that they can be bent and folded into a mountain shape or unfolded into a flat shape as they move toward and away from each other.

In addition, 19 in the figure is a pair of tread support bars provided near the middle of each of the pantographs 7 with their respective lower ends pivotally connected and mutually arranged in an inverted V shape. The above-mentioned two front and rear tread plates 8a, 8b to 10 each have a catch seat 20.
When a and 10b are each expanded into a flat shape, they are received from below to prevent further downward rotation. Further, 21a, 21b, 21c are lock pins protruding from the upper end portions of the outer surfaces of the legs 1a, 1b, 1c other than the rearmost leg 1d; These leg fasteners 22b, 22 are rotatably pivoted to the upper ends of the outer surfaces of the legs 3, 4 on both sides of the legs 1b, 1c, 1d other than the front end leg 1a.
c and 22d are the lock pins 21 of the leg immediately before each
a, 21b, and 21c to perform a locking action to prevent the legs from moving apart from each other, and the rearmost latch 22d rotates downward due to its own weight and collides with the stopper pin 23. It is a manually operated lock release system in which the lock pin 21c is held horizontally in preparation for intrusion, and other intermediate locking fittings 22b, 2
2c are interlocking rods 24 extending at right angles upward from the rear end.
is provided protrudingly, and the rear set of treads 9a, 9
When the tread plates 9a, 10a, and 10b are pushed down by the spreading movement, they are rotated to the front-up position to release the lock, and conversely, the pressing force is released by folding the tread plates 9a, 9b, 10a, and 10b into a mountain shape. This is an interlocking system in which the legs 1a to 1d rotate forward and downward under their own weight and lock onto the front lock pins 21a and 21b. Bending each pair of treads into a mountain shape and compressing them one after another will lock them.
When the rearmost latching metal fitting 22d is manually released from the locked state and the frontmost leg 1a is pulled forward, the two treads are spread out flat from behind, and the intermediate latches are sequentially engaged. Metal fittings 22c, 22
The lock b will be released and the legs will be able to open each other.

Here, the front end and rear end leg bodies 1a mentioned above,
A set of two front and rear tread plates 9a, 9b, located on the rear side of each intermediate leg body 1b, 1c other than 1d.
A treadle push-up mechanism is provided for bending 10a and 10b into a mountain shape to create a tight grip when folding them.
That is, the shaft 2 with a spacer 25 is attached to the upper end of each inner surface of the support columns 3 and 4 on both sides of the intermediate leg body 1b.
6 is provided protrudingly, and a push-up lever 27 is provided on the shaft 26, which is rotatably pivoted at a slightly forward portion from the middle in the front-rear direction, and has a substantially inverted shape. The lower end of the connecting bar 28 is pivotally connected to the rear end of the connecting bar 28, and the upper end of the connecting bar 28 is the front side of the tread plate located directly above it, that is, the set of two plates arranged at the upper rear side of the intermediate leg body 1b. The tread plate 9a is pivotally connected to the tread plate 9a by a shaft 30 with a spacer 29 located approximately midway between the front and back of the lower surface of the tread plate 9a.
The push-up lever 27 is adapted to rotate in conjunction with the link bar 28 via the link bar 28. The shaft 30 is provided with both ends supported by the both-side support frames 11a or 12a and mounting hardware 31 fixed to the lower surface of the footboard 9a. In addition, the push-up lever 2
A substantially inverted L-shaped push lever 32 is rotatably provided on the shaft 26 with the upper end bent portion 32a pivotably attached to the shaft 26.
The upper bent portion 32a of the push lever 32 has a cross-sectional shape extending over the front and rear ends.
A pair of rollers 33 are rotatably attached to the lower end of a hanging portion 32b extending downward at right angles from the front end of the upper bent portion 32a. The push lever 32 rotates together with the push-up lever 27 when the roller 33 collides with a part of the front leg 1a and is pushed backward as the front leg 1a moves backward. . The above-described treadle push-up mechanism is provided in exactly the same way at both side supports 3 and 4 of the next intermediate leg 1c, and is interlocked with the treadle 10a behind it. Note that the legs 1a and 1b are each provided with a pusher 34 that presses the roller 33 located at the rear from the front, and the legs 1b and 1c
are each provided with a receiving metal fitting 35 for receiving the roller 33 located in front of each from the rear.

Therefore, to describe the operation of the above-mentioned configuration, the third
When folding and retracting the whole from the expanded state as shown in Figure a, first, when the worker pushes the frontmost leg 1a from the front to the rear, the two front and rear treads of the frontmost set are simultaneously moved. For 8a and 8b, the worker lifts and bends them by hand to an appropriate angle, and then the frontmost leg 1a
As the foot continues to be pushed backward, the two footboards 8a and 8b of the frontmost set that have been able to bend sharply will form a mountain shape as the frontmost leg 1a moves backward toward the next leg 1b. As it is folded, the roller pusher 34 on the rear surface of the frontmost leg 1a collides with the lower end roller 33 of the push lever 32 of the treadle push-up mechanism, causing the push lever 32 to move around the shaft 26. As a result, the push lever 3 is rotated backward.
The upper surface of the front end of the push-up lever 27 is pushed down by the upper bent portion 32a of the push-up lever 27, and the push-up lever 27 rotates around the shaft 26 in a rearward position. The two front and rear footboards 9a, 9b of the second set from the front are pushed up to an appropriate inclination angle via a connecting bar 28 connected to the end to create a tight bend, resulting in the state shown in FIG. 3b. However, as the worker continues to push the frontmost leg 1a backward, the second leg 1b from the front is also pushed and moved, causing the third leg 1c to move.
As a result, the two front and rear treads 9a and 9b of the second set, which maintain the tightness of the bend, are bent into a mountain shape and folded. , the pusher 34 on the rear surface of the second leg 1b collides with the roller 33 at the lower end of the push lever 32 of the treadle push-up mechanism behind it, causing the push lever 32 to rotate rearward as before. By rotating the push-up lever 27, the two front and rear footboards 10a and 10b of the third set from the front are pushed up to an appropriate inclination angle via the connection bar 28 to create a tight bend. However, by continuing to press the button further, the third leg 1c from the front is also pushed and moved backwards to approach the rearmost leg 1d, and as a result, the third leg 1c that has obtained the above-mentioned stiffness of bending is moved. Front and rear treads 10a, 1
0b is bent into a mountain shape and folded, and thus the whole is folded compactly as shown in FIG. 3c.

In addition, in the above embodiment, there are four legs 1a to 1d.
Three sets of treads 8a, 8b to 10a, 10 are arranged.
b, but the present invention is not limited to the above-mentioned embodiment, and it is also possible to use only three legs and two sets of treadboards, and the number of legs and treadboards can be increased beyond that of the above-mentioned embodiment. In either case, it is possible to obtain the tight bending of all the pairs of front and rear treads arranged after the second one without manual operation.

Note that 36 in the figure is shown only in FIG. 4 and omitted in other figures, but it indicates the legs 1a and 1d at the frontmost and rearmost ends.
A well-known floor fixing hammer lock mechanism is attached to the lower ends of the outer surfaces of the support columns 3 and 4 via mounting hardware 37, and the base 40 is crimped to the floor by alternately stepping on the upper and lower pedals 38 and 39. This prevents the legs 1a, 1d from floating or, conversely, allows the legs 1a, 1d to move by being lifted off the floor. Further, in the figure, reference numeral 41 denotes a shock absorber 42 which is held near the middle of each of the legs 1a, 1b, 1c, and 1d, and each set of tread plates 8a, 8b, 9a, 9b, 10a, 1 on the upper side thereof.
This is a shock absorbing mechanism that controls the moving speed when 0b spreads. Further, 43 is a curtain plate vertically attached to the front side of the frontmost leg 1a via frames 44.

Since this invention has been made as described in detail above, when folding from a flat unfolded state, only the frontmost pair of front and rear treads is lifted by hand to an appropriate inclination angle and bent into a mountain shape. Once the hook is made, the worker can then simply compress the legs in order from the front, and the second and subsequent pairs of front and rear treads will automatically bend into a chevron shape. This is a folding stage with extremely good workability that allows the whole to be folded very easily.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a partially cutaway plan view, Figure 2 is a partially cutaway front view, Figures 3a, b, and c are side views showing each contraction/expansion operation state, and Figure 4 is an exploded perspective view with some parts omitted. It is a diagram. 1a, 1b, 1c, 1d...legs, 6...wheels, 7
...Pantograph, 8a, 8b, 9a, 9b, 10
a, 10b...Treadboard, 26, 30...Shaft, 27
...Push lever, 28...Connection bar, 32...Push lever, 32a...Bending part, 32b...Descent part, 33...
Roller, 34...Roller press hardware.

Claims (1)

[Claims] 1 Three or more legs having wheels at the lower parts of both sides are arranged in the front and back direction, and the front and rear legs are connected to each other by a pantograph so that they can move toward and away from each other within a predetermined range, and the upper part of each of the legs is connected to each other by a pantograph. A set of two front and rear footboards are pivotally connected to each other so as to be bendable.The two front and rear footboards of each set are folded into a mountain shape by moving the front and rear legs toward and away from each other. In the case where the push-up lever is supported so as to be folded or spread flat, the push-up lever is pivotally supported on the side surface of the intermediate leg body other than the frontmost end and the rearmost end at approximately the middle part in the front and back direction. The lower end is pivotally connected to the rear end of the push-up lever, and the upper end is pivotally connected to the lower surface of the tread plate disposed on the rear side of the upper part of the intermediate leg to which the push-up lever is pivoted. A connecting bar is provided to connect the tread plate and the push-up lever, and the push lever has a substantially inverted L-shape consisting of a long hanging portion and a bending portion bent rearward from the upper end of the push lever. By pivotally connecting the rear end of the bent portion so as to be able to rotate coaxially with the push-up lever, as the hanging portion rotates rearward, the bent portion engages with the rear end of the push-up lever and is pushed down. and a roller that is pivotally supported at the lower end of the hanging part of the push lever and rotates the push lever rearward by hitting the rear surface of the front leg when the front leg moves backward. A foldable stage featuring