JPH0432447Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to movable seats in a hall or the like used for multiple purposes.

[Conventional technology]

In order to use gymnasiums, halls, grounds, etc. for multiple purposes, the chairs installed in the form of steps descending from the front are folded up, and the tiered floor supporting the chairs is placed under the rear tiered floor in a nested manner. Mobile viewing seats designed to accommodate spectators are well known (for example, the
(See Publication No. 20787).

Conventionally, in order to enter and exit these stepped floors,
A large number of frame-shaped link plates with wheels attached to the bottom surface are connected to each other in a straight line, and the wires connected in the form of links are wound around a drum, so that the berm can be stacked backwards. Furthermore, by rotating the drum in reverse and extending the link plates in a straight line, the stepped floor was developed in a stepwise manner.

[Problem that the invention attempts to solve]

The above-mentioned conventional device has problems in that the structure of the link plate is complicated, resulting in high cost, and also requires a large amount of power to index the wires, and also places a large load on the floor of the building.

[Means for solving problems]

The present invention is intended to provide a movable seating system in which the tiers can be moved via cables such as wires or chains, thereby simplifying the structure.

In other words, the movable bleachers of the present invention support chairs and are placed side by side in the front and back, and are interconnected with a plurality of tiered floors that are sequentially smaller in size as they are placed in the front, so that they can be nested in the front and back direction. In movable bleachers that can be stowed or pulled out, there is a winding drum, one end of which is wound around the winding drum provided at the rearmost part of the tiered floor, and the other end of which is fixed to the foremost tiered floor. One end of the storage cable is wound around the winding drum, and the other end is arranged so that it has a bellows shape in side view when it is stored and a step shape when it is pulled out. The drawer cable is wound in sequence between the fixed wheels provided at the upper rear part of the front part of the adjacent bunk bed and the lower front part of the next part, and then fixed to the frontmost part of the bunk bed. The present invention is characterized in that each stage bed can be pulled out or stowed by rotating the winding drum in the normal or reverse direction.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

Reference numerals 1 to 4 indicate four tiered beds arranged side by side from back to front in this order, and the ones at the front are successively lower.

Back plates 1b to 4b are erected at the rear edges of the floor plates 1a to 4a of each of the tiered floors 1 to 4, respectively.

In addition, the rear end of each floor plate 1a to 4a has a planar U-shape facing forward, and the rear end has a
The upper ends of the legs 1c to 4c, which have become taller and wider in width and can be fitted in a nested manner, are each fixed in pairs on the left and right.

Wheels 5, 5 are attached to the front and rear sides of the lower ends of each of the legs 1c to 4c, respectively.

A large number of leg rods 7a, 7a are provided on each step floor 1 to 4, except for the part that becomes the central passage 8, and the lower ends of the leg rods 7a, 7a are horizontally aligned. A chair 7 is provided between adjacent leg rods 7a, 7a which are connected by a rod 6.

A downward lever 1 is located at the appropriate position of each horizontal rod 6.
1 is fixed, and the lower end of the lever 11 is connected to each step floor 1 to
The rotary shaft 10 is fixed to a rotating shaft 10 that horizontally passes through a base 9 fixed to the upper surface of the rear end of the rotor 4.

The rotating shaft 10 is driven by a drive means (not shown).
When the chair 7 is rotated, each chair 7 is rotated from the upright position shown in FIG. 2 to the reclined position shown in FIG.

Next, a moving mechanism for moving each of the tiered floors 1 to 4 from the use position of the bleachers shown in FIG. 2 to the storage position shown in FIG. 3 will be described.

In FIG. 2, reference numeral 13 indicates a fixed pulley that protrudes rearward from the rear surface of the central part in the left-right direction of the frontmost step bed 4, and 14 indicates a fixed pulley provided on the lower front surface of the next step bed 3, which can be deployed. This is a fixed pulley located almost directly above the fixed pulley 13 at the time.

Similarly, a fixed pulley 15 is provided on the rear side of the step bed 3, and similar fixed pulleys 16 and 17 are provided on the front lower surface and rear side of the step bed 2 located behind it, and A fixed pulley 18 is installed on the front lower surface of the floor 1.
is provided.

19 is a stationary pulley attached to the inner wall 20 of the building behind the fixed pulley 18; 21 is a stationary pulley attached to the inner wall 20 of the building;
A winding drum is provided on the floor 22 below the stationary pulley 19.

A small drum 21a is attached to the shaft 23 of the winding drum 21.
and the large drum 21b are fixed in line, and the shaft 23
The distal end thereof is connected to a driving means consisting of a motor 24 capable of forward and reverse rotation.

Reference numeral 25 denotes a storage cable (wire), the front end of which is attached to a stopper 27 provided on a mounting frame 26 that is suspended from the center of the floor plate 4a of the front step floor 4 and has an upwardly U-shaped front face. The rear end of the large drum 21b passes through the rear lower side of the large drum 21b, and the rear end of the large drum 21b
It is attached to b.

Reference numeral 28 denotes a pull-out cable (wire), one end of which is fixed to the small drum 21a after being wound around the small drum 21a, and the other end extends upward from the rear side of the small drum 21a. , wound around the stationary pulley 19 later, and then sequentially wound around the fixed pulleys 18, 17, 1.
6, 15, 14, and 13 are wound in this order from front to back, and then fixed to a stopper 29 attached to the lower surface of the floor plate 4a of the foremost step bed 4.

Thus, the drawer cable 28 forms a deep zigzag shape when viewed from the side when the steps 1 to 4 are stored, and extends forward so as to form a substantially right-angled step shape when viewed from the side when pulled out.

Reference numeral 30 is a stopper provided on the floor 22 to restrict the retreating position of the rearmost stepped floor 1.

Next, the operation of the above-mentioned movable bleachers will be explained.

In the drawer position shown in FIG. 2, when the chairs 7 are not in use, the seats of each chair 7 are folded backwards and upwards, and then the rotating shaft 10 is rotated for each row using a drive means (not shown). , the entire chair 7 is rotated forward to be in a horizontal state as shown in the third figure.

After that, the motor 24 is rotated forward, and the winding drum 2
1 is rotated in the counterclockwise direction in FIG.
8 is rewound.

Therefore, the frontmost tier 4 is stored backwards in order, such as under the next tier 3, and the next tier 3 is stored under the next tier 2, and so on. 28 is the fixed pulley 13 as shown in FIG.
~18, it is bent into a deep bellows shape.

When the motor 24 is reversed, the drawing wire 28 is moved to the small drum 21a, as shown by the arrow in FIG.
fixed pulleys 17, 18, 15, 1
The gaps 6, 13, and 14 are small. Therefore, the drawer cable 28, as shown in FIG.
Between the fixed pulleys, they are stretched in a step-like manner, and the stair beds 2, 3, and 4 are sequentially pulled out forward, and at the same time, the storage cable 25 is pulled out forward.

At this time, each of the back plates 1b to 4b acts as a stopper, and the front step bed does not slip out from the rear step bed.

When the tiers 2, 3, and 4 have been pulled out, the chairs 7 are erected and the seats are unfolded to be used as viewing seats.

The relationship between the forces required for pulling out and storing the movable bleachers according to the present invention can be expressed in a general formula as follows.

If the load on the step bed is W, the pulling force is F, and the friction coefficient of the floor surface is μ, then F=μ·W.

If the force that moves the load W, that is, the pulling force shown in Figure 5, is [Ft], and the force in the opposite direction to the load is [Fup], as shown in Figure 6, Ft = (W - Fup) μ...(1) As shown in Figure 4, if the force applied to the wire when pulling out is Fs, and the pulling angle is α, then tanα=ha/FuP=Fs・sinα...(2) Also, Ft /Fs=cosα Therefore, Ft=Fs・cosα ……(3) From (1)(2)(3), Fs・cosα=(W−Fs・sinα) μ =W・μ−Fs・sinα・μ Fs (cosα+sinα)=W・μ The tension of the wire is Fs=Wμ/cosα+sinα・μ.

In the embodiments described above, wires are used as cables, but it goes without saying that they can be replaced with chains, ropes or belts.

The driving means may be manual rather than a motor, and the chairs on the step may be automatically folded by the driving means.

Furthermore, although the load on the bunk bed is reduced only when the bunk is pulled out, the load on the bunk bed can be reduced if the tension is maintained on the pull-out cable after the bunk is pulled out, that is, even when in use. can do.

This can be done by hanging a "weight" on the pull-out cable near the take-up drum to apply tension after the draw-out, or by interposing a clutch between the large and small drums on the take-up drum. , with high tension applied to the drawer cord.
All you have to do is stop the motor.

[Effect of idea]

In the movable bleachers of the present invention, the tiers are pushed out and retracted only through cables such as wires or chains, so the mechanism for moving the tiers is simple and the weight of the entire device is reduced.

In addition, since cables are wound between the upper and lower movable wheels of the adjacent tiers, when the cables are wound around the winding drum and the tiers are pulled out, the tension of the cables is applied. , an upward force acts on the rear part of the stepped floor, the load on each stepped floor becomes smaller, and the load on the building floor is reduced.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of an embodiment of the present invention, FIG. 2 is a right side view when unfolded, and FIG. 3 is a side view showing the stepped floor in a stored state.
Figures 4 and 5 are schematic side views for explaining the general formula for the force applied when pulling out the bunk bed, and Figure 6 is a schematic diagram for calculating the formula for the cable tension in Figure 4. It is. 1-4...Ranked floor, 1a-4a...Floor plate, 1b-
4b...Backboard, 1c-4c...Legs, 5...Wheels, 6...Horizontal rods, 7...Chairs, 8...Aisle, 9
... Base, 10 ... Rotating shaft, 11 ... Lever, 1
3-18... Fixed pulley, 19... Stationary pulley, 20
...Inner wall, 21... Winding drum, 22... Floor, 2
3... Axis, 24... Motor, 25... Storage cable, 26... Mounting frame, 27, 29... Stopper, 2
8...Cable for drawer, 30...Stopper.

Claims (1)

[Claim for Utility Model Registration] A chair that supports a chair and is placed side by side in the front and back, and is stored in a nested manner in the front and back direction by interlinking a plurality of tiered floors that are successively smaller in size as they are in the front. In a movable spectator seat that can be pulled out or pulled out, one end is wound around the winding drum provided at the rearmost part of the tiered floor, and the other end is fixed to the foremost tiered floor. storage cables, one end of which is wound around the winding drum, and the other end of which is adjacent to each other in the front and rear such that it has a bellows shape in side view when stored and also has a step shape when pulled out. After being sequentially wound between the fixed wheels provided at the rear of the upper stage of the front stage of the step bed and the lower front side of the stage after that,
It is characterized by comprising a pull-out cable fixed to the foremost tiered floor, so that each tiered floor can be pulled out or stored by rotating the winding drum in the normal or reverse direction. Mobile bleachers.