JPH0427964Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a tier rectilinear device for movable bleachers that accommodates a plurality of tiers in a nested manner.

[Conventional technology]

In multipurpose halls, etc., when not in use, the chairs are stored nested one after another under the rear tiers, and when in use, each tier is extended forward to form a staircase shape, and the folded chairs on the tiers are pulled out. A movable bleacher seat that can be raised up and used as a grandstand seat is well known.

An example of such a step-type platform for entering and exiting is shown in FIG. 5 of ``Moveable Spectator Seats'' (Japanese Patent Application No. 121000/1982) previously filed by the present applicant.

This is to store each tier in the last row of tiers d by winding up a wire c which is fixed to the front row of tiers a and whose rear end is wound around a drum b. In addition, in order to extend the tiered floor forward, pass it between the fixed pulleys e and f provided at the rear of the previous tiered floor and the bottom surface of the next tiered bed, respectively, so that the tip is on the tiered floor a and the rear end is on the drum. By winding up the wire c wound around b, the step bed is developed into a step-like shape.

Each of the tiers rolls on the floor i via wheels h, and both rear sides of the previous tier are guided by the next tier, so the tiers tend to meander when deployed. There is a point.

For this reason, a ``parallel guidance device for telescopic movable bleachers'' that rotates the left and right gears at the same speed and moves them straight by meshing racks and gears is disclosed, for example, in Japanese Utility Model Application Publication No. 127255/1983. has been done.

[The problem that the idea attempts to solve]

Since spectator seats are usually constructed by assembling a large number of grooved materials by welding, etc., dimensional errors and distortion of the frame are unavoidable. It is not easy to get people to do it.

[Means to solve the problem]

The tier straightening device for movable bleachers according to the present invention stores each tier in a nested manner under the rear tier when not in use, and extends each tier forward when in use. In the movable bleachers arranged in the form of steps, sprocket rows each consisting of a driven sprocket and a pair of guide sprockets are arranged on the left and right side walls near the rear edge of the front stepped floor, and the driven sprockets are connected to each other. A pair of left and right chains are connected to each other by a connecting shaft so that they can rotate synchronously, and are fixed to both sides of the lower surface of the rear step bed following this step bed so that their front ends face forward and backward. The sprocket is wound between the sprocket rows, and its rear end portions are fixed in parallel to both rear sides of the step bed.

[Effect]

The sprocket row installed at the rear of the front step floor is
The front berm is guided by a pair of left and right chains stretched under the rear berm, and the left and right driven sprockets rotate synchronously via a connecting shaft.
Guided in parallel.

〔Example〕

An embodiment of the present invention will be described below in Figures 1 to 4.
This will be explained based on the diagram.

1 is a movable seating area, which is made up of multiple tiered floors that gradually become smaller in width and height as they move towards the front.
Reference numeral 2 indicates the front row of tiers, and 3 and 4 indicate the second and third tiers at the rear, respectively.

When not in use, these tiers 2, 3, and 4 are nested one after another under the rearmost tier (not shown), and when in use, they are interconnected with each other so that they can extend forward in a step-like manner. It is moved by a drive means (not shown).

Since the mechanism for moving these tiered floors is the same as that of the movable bleachers shown in FIG. 5, a description thereof will be omitted, and only the tiered floor rectilinear movement device according to the present invention will be described.

The frontmost stepped floor 2 has a box shape with an open bottom, with a front plate 2b and a rear plate 2c hanging from the front and rear edges of the base plate 2a, and side plates 2d, 2d hanging from the left and right side edges. .

Similarly, the next tiered floor 3 has a front plate 3b, a rear plate 3c, and side plates 3d, 3d on the lower surface of the base plate 3a, and the tiered floor 4 has a front plate 4b and a rear plate on the lower surface of the base plate 4a. It includes a plate 4c and side plates 4d, 4d.

At the top of both side edges of the rear plates 2c and 3c of each step floor 2 and 3, a pair of left and right vertical mounting plates 5 facing rearward are provided.
5 is provided protrudingly.

As shown in FIG. 3, near the upper edge of each mounting plate 5, a pair of shafts 6 and 7 facing in the left and right directions are provided protruding from the upper edge of each mounting plate 5 at a required distance. 6 and 7 have guide sprockets 8 and 9, respectively.
is supported.

Bearings 10a, 10a provided on each mounting plate 5, 5 below between the front and rear guide sprockets 8, 9
A horizontal connecting shaft 10 is pivotally supported between them, and a driven sprocket 1 is located near the left and right ends of this connecting shaft 10.
1 and 11 are attached so that they can rotate together.

Reference numeral 12 shown in FIG. 3 is a left roller chain facing front and rear, the front end 12a of which is fixed to the lower left end of the rear surface of the front plate 3b of the step floor 3, and the intermediate part 12
b represents the guide sprocket 8, the driven sprocket 11 and the guide sprocket 9, and an inverted Ω in side view.
It is wound in a letter shape, and the rear end portion is fixed to the front surface of the rear plate 3c of the stepped floor 3.

The right roller chain 13 is symmetrical with the left roller chain 12, and its front end 13
a, the middle part 13b and the rear end part are constructed in the same way as the one on the left side.

Similarly to the above-mentioned steps, on the next step bed 3, a sprocket row consisting of guide sprockets 8, 9 and driven sprockets 11 is attached to mounting plates 5, 5, and a pair of left and right roller chains 12, 13 are installed.
They are wound parallel to each other.

Next, the operation will be explained using the stepped bed 2 as a representative example.

In the stored state of the movable bleachers 1, the tiered floors 2, 3, and 4 are stacked vertically, and the sprocket rows are also aligned vertically.

When the step bed 2 is pulled forward by a driving means (not shown), the left and right sprocket rows move forward while straining the roller chains 12 and 13. At this time, the left and right driven sprockets 11, 11 rotate integrally and synchronously on the connecting shaft 10, so that the front end of the step bed 2 moves straight without swinging left or right.

Similarly, the tiered bed 3 is pulled out while moving straight toward the tiered bed 4 located behind it.

[Effect of the idea] Left and right 1 installed facing the front and rear direction on the rear step floor
Each set of chains is wound around a pair of left and right driven sprockets attached to both ends of a connecting shaft facing left and right at the rear of the front tier, so each tier is guided and moved in parallel.

Therefore, when extending the tiered floors of the movable bleachers, each tiered floor moves straight without swinging from side to side, and moves smoothly without being damaged due to collision between the tiered floors.

Since the connecting shaft that connects the driven sprockets is provided below the left and right chains, it can also be applied to tiered floors in which a reinforcing beam facing front and back is suspended from the center of the tiered floor.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway plan view of an embodiment of the present invention, Fig. 2 is a vertical sectional view taken along the center line of Fig. 1, and Fig. 3 is an enlarged view of the sprocket row in Fig. 2. FIG. 4 is a longitudinal sectional view taken along the line - in FIG. 3, and FIG. 5 is a schematic side view showing a conventional movable audience seat. 1...Movable bleachers, 2, 3, 4...Dan floor, 2
a, 3a, 4a... base plate, 2b, 3b, 4b...
Front plate, 2c, 3c... Rear plate, 2d, 3d, 4d...
...Side plate, 5...Mounting plate, 6, 7...Shaft, 8, 9...
...Guide sprocket, 10...Connection shaft, 11...
Driven sprocket, 12, 13...Roller chain.

Claims (1)

[Scope of claim for utility model registration] When not in use, each tier is stored in a nested manner under the rear tier, and when in use, each tier is extended forward to form a staircase shape. In the movable spectator seats, sprocket rows each consisting of a driven sprocket and a pair of guide sprockets are arranged on the left and right side walls near the rear edge of the front tiered floor, and the driven sprockets can rotate synchronously with each other. A pair of left and right chains are connected to each other by a connecting shaft and are fixed to both sides of the lower surface of the rear step bed following this step bed so that their front ends face forward and backward, and their middle portions are connected between the sprocket rows. A tier bed straight-advancing device for movable bleachers, characterized in that each of the tiers is wound around the tier and its rear end portions are fixed in parallel to both rear sides of the tier floor.