JPH0243159Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a retractable stair-shaped bleachers system in which the upright position of the handrails is manually released when the seats are stored after use. This relates to folding handrails in bleachers.

[Conventional technology]

Conventionally, this type of retractable stair-shaped bleachers has a base for each tier of bleachers, which has rollers at the bottom and pillars at the top, and a movable platform for each tier of bleachers, although not shown. By sequentially arranging them outward in proportion to the height of the seats, it is possible to store all the movable platforms for each tier of seats inside the lower part of the movable platform for the highest tier of seats. It is composed of However, the handrails installed on the outside sides of the movable platform for each bleacher seat, which are all formed to the same width, are arranged in a straight line at the same position from the first row of seats to the highest row of seats. Therefore, unless this condition is released after using the telescoping staircase-like seats, the movable platform of each tier of seats will not be able to move backwards. For this reason, conventionally, each handrail was inserted into each tier of bleachers when the bleachers were in use, but after the bleachers were used, they were configured to be individually attached to and detached from the support cores installed in each tier of bleachers. It had been.

[Problem that the invention attempts to solve]

Due to the above configuration, the handrails in the conventional telescoping staircase-like bleachers have the following problems.

(1) The handrails of each tier of bleachers were removably inserted into the support core of each tier of grandstands, so after using the retractable tiered bleachers, the movable platform of each tier of grandstands was moved backwards. All of the handrails had to be removed before returning to the original location. Therefore, in the case of retractable tiered bleachers with a large number of seats on each tier, it takes tremendous effort and a long time to attach and remove the handrails, which reduces the multi-purpose utility of the retractable tiered bleachers. Ta.

(2) Furthermore, when moving the movable platform of each tier of bleachers backwards after using the retractable stair-shaped bleachers, there was no way to detect whether the handrails were attached or removed. Therefore, even if the above-mentioned handrail fails to be attached or detached (forgot to attach or detach), the movable platform of each tier of bleachers will be moved backwards. There was a problem with the moving platform backing up, making it impossible to ensure safety when storing the seats on each tier.

[Means for solving problems]

This invention solves the above-mentioned problems of the conventional technology, and when storing the seats on each tier, it is easy to do so by simply lifting and lowering the handrail body installed for each tier of seats. The handrail can be quickly released from the upright position, and if the handrail fails to fall down (forgets to fall down), the motor for moving backward the movable platform of each stage of the bleachers and the operation driven by the motor. Provided for each tier of the retractable tiered bleachers, which maintains the OFF state and prevents the member from operating, thereby ensuring safety when the tiers of bleachers are stored. The aim is to provide folding handrails that can be used. The feature of this invention is that the retractable tiered seats have multiple tiers of seats with movable platforms of varying heights that can be stored under the movable platform of the highest seat. A sheath-like support base is erected on the side of the movable platform of the tiered bleachers, and the handrail body, which has a handrail leg with a long hole at the lower end, is connected to the hole in the upper base and the handrail leg. The handrail support shaft is inserted into the elongated hole so that the handrail body can be folded after being lifted, and a limit switch is placed at one end of the base body to detect the remaining state of the handrail leg. It is in.

[Effect]

With the above configuration, when using the retractable stair-shaped bleachers, the handrail body that is lying down on the movable platform side of each tier of bleachers is raised outwards around the handrail support shaft and then released. Since the handrail leg at the bottom end has a long hole formed in the vertical direction, the handrail body can be raised to the lower limit height position by sliding the handrail leg inserted into the support base using this long hole as a guide. It can descend under its own weight and regain its standing position. In addition, when storing the retractable tiered bleachers after use, the handrails on both sides become an obstacle when storing them, so the handrails themselves are installed for each tier of bleachers. When the handrail is lifted to the upper limit height and then laid down on the movable platform side, the handrail legs inserted into the support core are completely detached due to the above lifting movement, and the handrail's standing configuration is changed. As a result, the handrail body can be smoothly and quickly lowered to the side of the movable platform. Note that when the handrail body is lifted as described above, the limit switch for each position is turned on, so the motor for moving the movable platform of each stage of the bleachers backwards and the operating member driven by the motor are turned on. Similarly, it will turn ON and operate. Therefore, each of the above-mentioned tiers of spectator seats can be easily and safely stored. At that time, if the handrail of any of the tiers of spectator seats falls down and leaks, the above-mentioned motor and the operating member driven by the motor will remain in the OFF state due to the handrail insertion and will not operate. By this, it is possible to completely eliminate the trouble of the movable platform of each tier of spectator seats receding due to the handrail not collapsing.

〔Example〕

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

First, to explain the configuration, as shown in FIGS. 1 to 6, each movable platform 5 of a multi-tiered bleacher seat with a movable platform that increases in height is interconnected to expand and contract in the front and rear direction. Each base 1 is equipped with a roller 2 at the bottom and a support 3 at the top for movement.
are sequentially arranged outward in proportion to increasing the height of each movable platform 5 in each tier of spectator seats,
In addition, each support column 3 is also formed to increase in height in order, and when in use, a motor B placed on a part of the base 1 and an operating member (not shown) driven by the motor B are connected to each other. By operating the movable platform 5 of the first row of seats and sequentially pulling them out onto the floor surface C in front of them, all of the seats in the tiers extend into a tiered shape, and the movable floor of each tier of seats is extended. A large number of spectators can sit on each of the chairs 6 of the platform 5, and when not in use, contrary to the above, the movable platform 5 of the first row of seats is returned to the bottom of the movable platform 5 of the highest row of seats. Then, the movable platform 5 of each tier of bleachers is stored inside the lower part of the movable platform 5 of the highest tier of bleachers and grouped together, and the retractable stair-shaped bleachers A in this state are shown in the diagram behind it. In the retractable stair-shaped bleachers that can be stored in storage recesses, the following folding handrails 7 are arranged at both end positions of each movable platform 5 of each tier of bleachers described above. .

The above folding handrail 7 is constructed as follows. That is, as shown in FIGS. 1 to 5, the support base 8, which is the support base of the handrail 7, is formed into a rectangular cylinder with a predetermined length, and the upper end of the opening is raised on the outside. It is formed into an inclined opening field with a lowered inner side. A perfectly circular hole 8a through which a handrail support shaft 10 (described later) is inserted is provided in the front and rear surfaces of the upper part near this inclined opening. The support core 8 for every two bodies according to this aspect is
They are fixed upright at both ends of a footboard 4, which serves as the base of the movable platform 5 of each tier of spectator seats, at a predetermined interval.

Next, the handrail main body 7a, which becomes the folding part of the handrail 7, has a lower front frame side, a higher rear frame side, and a side plate 11 is attached within the deformed four-sided frame with the upper frame side tilted forward. , each handrail leg 9 facing downward is hung in parallel at the middle and rear end positions of the lower frame side, and the part from the middle to the lower end of the handrail leg 9 is inside the support base 8 described above. It is formed into a narrow frame piece with a U-shaped cross section that allows for loose insertion. An elongated hole 9a into which a handrail support shaft 10 (to be described later) can be loosely fitted is provided through the parallel straight body from the upper front and back surfaces of this thin frame piece to the front and rear surfaces near its lower end. The lower end of the handrail leg 9, which is located close to the narrow frame piece and directly above it, is formed into a similar inclined end corresponding to the inclined opening end of the support base 8.

The handrail main body 7a according to this embodiment has a structure in which the thin frame pieces of each lower handrail leg 9 are loosely inserted into both support bases 8 on each side, and between the hole 8a and the elongated hole 9a formed on both front and rear surfaces. Handrail support shaft 1
The handrail 7 is assembled so that the handrail 7 can be stably erected when all of the narrow frame pieces are loosely inserted into the support base 8.
Furthermore, when the handrail main body 7a is lifted by hand to the upper limit height where the lower end of the elongated hole 9a of the handrail leg 9 comes into contact with the handrail support shaft 10, the handrail main body 7a is moved toward the movable floor platform 5 with the handrail support shaft 10 as the center. (This height position includes the upper surface of the auxiliary steps 13 placed on the rear surfaces of each side of the movable platform 5), and thereby the handrail main body 7a can be lowered horizontally. It is assembled in such a way that the upright configuration can be released. In this case, each movable platform 5 is placed in a collapsed state with the handrail body 7a released from its upright position.
In order to make it possible to retract and store the handrail body 7a, the thickness of the handrail body 7a when it is folded down is slightly increased between the upper surface of the auxiliary step 13 in each tier of spectator seats and the lower surface of the movable floor platform 5 on the side of the adjacent rear tier. A void D having a height that exceeds the height is formed. (See Figure 1) Furthermore, one support base 8 of each handrail 7 mentioned above
A limit switch 12 for detecting whether or not the narrow frame piece of the handrail leg 9 remains inside the base 8 is arranged at an external position thereof. This limit switch 12 is
When there is no thin frame piece of the handrail leg 9 inside (when the switch lever not shown is not pressed),
The handrail leg 9 is in the ON state, and the handrail leg 9 is inside the base 8.
The switch is configured as an OFF reset type in which the switch is in the OFF state when the narrow frame piece is present (when a switch lever (not shown) is pressed). The limit switches 12 in each stage of the bleachers are connected in series between a motor B and a power switch that operates an operating member (not shown) driven by the motor B. As a whole, the folding handrail 7 is configured to be raised and lowered individually.

With the above configuration, when the bleachers A are used, the motor B and the actuating member driven by the motor B are operated to move the movable platform 5 of each tier of bleachers from the front seat side to the floor in front of it. After pulling out the handrail body 7a onto the surface C in the form of a pedestal as shown in FIG.
When you stand up outwards around the handrail support shaft 10 and let it go down, the handrail leg 9 at the lower end has a long hole 9a in the vertical direction, so the long hole 9a is used as a guide to support the handrail. When the thin frame pieces of the handrail legs 9 inserted into the base 8 come into contact with the inner surface of the support base 8, the handrail body 7a descends under its own weight to the lower limit height position, thereby changing its standing state. Can be easily recovered. Therefore, each tier of the retractable, stair-shaped bleachers A can be used safely with the handrails 7 attached. In this case, one support trunk 8 has a limit switch 12.
are arranged, and the handrail legs 9 inside it
Since a switch lever (not shown) is pressed due to the presence of the narrow frame piece, the motor B and its power switch are reset to the OFF state at this point. As a result, even if the above-mentioned power switch is turned ON, the motor B and the operating member driven by the motor B do not operate, so when the handrail 7 is erected, the movable platform 5 of each stage of the bleachers moves backward. It is possible to stably maintain the shape of a chick podium without causing any damage. In addition, when storing the seats on each tier of the retractable stair-shaped bleachers A after use, the handrails 7 on both sides of each tier's seats become an obstacle when storing them, so the handrail bodies 7a at each position should be Once it is lifted to the upper limit height depending on the condition of the handrail, when it is lowered onto the auxiliary step 13, the narrow frame piece of the handrail leg 9 inserted into the support base 8 is completely removed by the above lifting movement. Since the handrail 7 is detached from the upright position, the handrail main body 7a is removed as described above.
can be smoothly and quickly lowered onto the auxiliary step 13. Note that when the handrail main body 7a is lifted as described above, since the thin frame pieces of the handrail legs 9 are not present in the support base 8, the limit switch 12 at each position is turned on at this point. Therefore, the motor B for moving each movable platform 5 backward and the actuating member (not shown) driven by the motor B are similarly turned on and operated, thereby making it possible to view each stage. Since the seat movable platform 5 can be retracted to the state where it is stored inside the lower part of the movable platform 5 of the highest bleacher seat, it is possible to easily and Can be stored safely. At this time, if there is a leakage in the handrail 7 of any step, the motor B and the motor B
The operating member driven by is maintained in the OFF state due to the continued insertion of the handrail 7, and does not operate even if the power switch is turned ON.
It is possible to completely eliminate troubles in which the movable platform 5 of each tier of spectator seats recedes due to the handrail 7 failing to fall down.

In addition, in the above embodiment, the support core 8 of each tier of spectator seats
When the switch lever (not shown) is not pressed (the support trunk 8
When the thin frame piece of the handrail leg 9 does not exist inside the support base 8), the switch becomes ON, and when the switch lever is pressed (when the thin frame piece of the handrail leg 9 exists inside the support base 8) Becomes OFF state
Although an OFF reset type limit switch 12 is used, the limit switch 12 of this invention is not limited to the above-mentioned embodiment. When the narrow frame piece part of the leg 9 does not exist), it is in the OFF state, and when the above switch lever is pressed (when the narrow frame piece part of the handrail leg 9 exists inside the support base 8), it is in the ON state. You may also use an ON reset type. In that case, connect the limit switch 12 of each row of spectator seats to a control panel (not shown), etc.
A device for detecting the presence of handrail 7 inside this (not shown)
By arranging this, it is possible to check whether or not the handrail 7 falls down when the seats at each stage of the retractable staircase-like seats A are stored.

[Effect of idea]

This idea is a retractable staircase-like bleachers in which multiple tiers of movable seats with varying heights can be stored under the movable platform of the highest seat.
A sheath-like support base is erected on the side of the movable platform of each tier of spectator seats, and the handrail body, which has a handrail leg with a long hole at the lower end, is connected to the hole in the base and the handrail leg. The handrail support shaft is inserted into the elongated hole so that the handrail body can be folded after being lifted, and a limit switch is placed at one end of the support base to detect the remaining state of the handrail leg. It is characterized by this. Therefore, when storing the bleachers, the handrail can be easily and quickly released from its upright position by simply lifting and lowering the handrail body. The drive source for moving the seats backwards remains OFF and does not operate, which has the effect of easily and reliably ensuring safety when the seats are stored.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a mutually adjacent movable platform equipped with a folding handrail according to this invention, Fig. 2 is a detailed cross-sectional view taken along the - line in Fig. 1, and Fig. 3 is a lifting mechanism for lowering the handrail. Operation diagram showing 4th
FIG. 5 is a front view of the moving handrail, and FIG. 6 is a partial side view showing the extended state of the bleachers equipped with the handrail. 4...Treadboard, 5...Movable floor platform, 7...Handrail,
7a...Handrail body, 8...Support core, 8a...
Hole, 9... Handrail leg, 9a... Long hole, 10...
Handrail support shaft, 12... Limit switch, A...
Telescoping tiered bleachers.

Claims (1)

[Scope of utility model registration request] In a retractable stair-shaped bleachers where multiple tiers of seats with movable platforms of varying heights can be stored under the movable platform of the highest seat, the movable platform side of each tier of seats A sheath-shaped support base is erected on one side, and the support base has a handrail body having a handrail leg with a long hole at the lower end, and the handrail support shaft is inserted into the hole of the base and the long hole of the handrail leg. A retractable stair-shaped spectator seat characterized in that the handrail body is assembled so that it can be folded after being lifted, and a limit switch for detecting the remaining state of the handrail leg is arranged at one end of the base body. folding handrail.