JPH0432445Y2 - - 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 multi-purpose halls, etc., when not in use, the front tiers are nested one after another under the rear tiers, and when in use, each tier is extended forward to form a staircase-like structure. , movable bleachers in which folded chairs on each tier are raised to form grandstand seats are known.

In order to move such a stepped floor back and forth, for example, the present applicant's previously filed patent application No. 121000 (Sho 61-121000) (Japanese Patent Application Laid-open No. 280456/1987) for "Moveable Spectator Seats" can be used.
There are some things shown below.

As shown schematically in FIG. 6, a wire c whose front end is fixed to the lower part of the foremost step bed a is passed through a stationary drum b provided below the rear side of the rearmost step bed d. The rear and upper surfaces of a stationary pulley m installed above it,
Wrap the upper and front surfaces of the pulley f provided on the last step d, the rear and lower surfaces of the pulley e provided so as to protrude rearward on the previous step, and then wrap it around the front step in the same way. After that, its front end is locked to the foremost step bed a.

When the wire c is wound up by the drum b, each tier is accommodated under the rearmost tier d, and when the drum b is rotated in the opposite direction, the tiers are rolled out in a stepwise manner. In this case, each tier is equipped with wheels h
moves by rolling on the floor n, but since both rear sides of the front tier move while being guided by the rear tier, the tier tends to meander when it is fed out. There is a problem.

For this reason, for example, US Pat. No. 3,400,502 describes a movable audience seat in which a parallel ruler made of a pulley and a rope is provided on each tier as a tier straight moving device.

[Problem that the invention attempts to solve]

The above-mentioned tier bed straightening device corrects the lateral swing of the tier floor by tensioning the rope wound around the pulley, but due to the slipping and stretching of the rope, it is difficult to always ensure straight-line movement. It doesn't necessarily mean that you will be forced to do it.

[Means for solving problems]

In order to solve the above-mentioned problems, the device for straightening the tiers of movable bleachers according to the present invention stores the front tiers in a nested manner under the rear tiers when not in use, and when not in use. Sometimes, in movable bleachers where each tier is extended forward to form a staircase, a double sprocket consisting of a pair of horizontal upper and lower sprockets is placed near the rear edge of the frontmost tier. At the same time, a pair of left and right chains facing in the front-rear direction, the front end of which is fixed to the lower side of the front end of the rear step bed following this step bed, is provided with a pair of left and right chains facing in the front-rear direction. A parallel ruler type guide mechanism was formed by winding the threads around the upper and lower sprockets of these two sprockets so that they were crossed between the sprockets, and by fixing the rear ends to both sides of the rear of the step bed. It is characterized by

[Effect]

The parallel ruler type guide mechanism, which is a combination of two left and right sprockets and a chain, allows the tiered floor to move straight in parallel without swaying.

〔Example〕

An embodiment of the present invention will be described below in Figures 1 to 5.
This will be explained based on the diagram. Note that the left side in FIGS. 1 to 3 is the front part.

Reference numeral 1 indicates a movable seating area, which consists of a plurality of tiered floors whose width and height gradually become smaller as they move toward the front. 2 indicates the front tiered floor, and 3 and 4 indicate the two tiers located behind it. Showing the floor.

When not in use, these step beds 2, 3, and 4 are nested one after another under the rearmost step bed (not shown), and when in use, they are extended forward in a stepwise manner. They are connected to each other by wires or the like, and are operated by a drive means (not shown).

The mechanism for moving these tiers is, for example, the sixth
It can be the same as the movable seating shown in the figure, so
The explanation thereof will be omitted, and a description will be given of the platform straightening device according to the present invention, which is used as a parallel ruler by combining a chain and two sprockets.

The frontmost tiered floor 2 has a box shape with a front plate 5a and a rear plate 5b hanging from the front and rear edges of the top plate 5, respectively, and side plates 5c, 5c hanging from the left and right side edges. ing.

Similarly, the other tiered floors 3, 4 have front plates 6a, 7a, rear plates 6b, side plates 6c,
It is equipped with 6c, 7c, and 7c.

Vertical shafts 8 and 9 are attached to the outer surface near the left and right ends of the rear plate 5b of the foremost step bed 2 via a mounting plate 10, and the upper ends of the vertical shafts 8 and 9 are connected to the rear plate 5b of the next step bed. 3
It's going inside.

A double sprocket 11, in which two upper and lower sprockets 11a and 11b are integrally connected, is pivotally supported at the upper end of the vertical shaft 8 on the left side when viewed from the front. 1
A double sprocket 12 consisting of 2b is pivotally supported.

As shown in FIG. 3, the front end 1 of the chain 13 faces in the front-rear direction on the left side of the next step bed 3.
3a is a fastener 15 provided at the front end of a horizontal plate 14 protruding inward from the left side plate 6c of the step floor 3.
It is attached to.

The intermediate portion 13b of the chain 13 passes through the rear part of the sprocket 11a above the left twin sprocket 11, and is wound around the front part of the sprocket 12a above the right twin sprocket 12. It is fixed to a fastener 17 provided at the rear end of a horizontal plate 16 that protrudes inward from one side plate 6c.

The right chain 18 in the step floor 3 is symmetrical with the left chain 13, and its front end 18
a is a fastener 1 provided at the front end of the right horizontal plate 16;
9, the intermediate part 18b is wound around the left and right lower sprockets 12b, 11b from back to front, and the rear end part 18c is fixed to the fastener 20 at the rear of the left horizontal plate 14. ing.

In this way, the left and right chains 13 and 18 cross each other between the two sprockets 11 and 12.

As shown in FIG. 1, the rear plate 6b of the next step bed 3 is also provided with a pair of left and right double sprockets 21, 22, as described above. The left and right chains 23 and 24 are crossed over the double sprockets 23 and 24 in the same manner.

Next, the operation will be explained using the foremost step bed 2 as a representative.

In the accommodated state of the stepped bed 2 shown in FIG. 3, the intermediate portions of the chains 13, 18 in the rear stepped bed 3 are engaged with the left and right twin sprockets 11, 12.

When the step bed 2 is pulled forward by a driving means (not shown), the twin sprockets 11 and 12
Move forward as shown by arrow j, and check chain 1 on the left and right.
3 and 18, the sprockets 11a and 12b are
They are rotated clockwise and counterclockwise in FIG. 3, respectively, and rotational forces are applied to the front part of the step bed 2 to the left and to the right, as shown by arrows k and.

In this way, since it is a parallel ruler type that combines two sprockets and a chain, there is no slippage, and the tilting force to the left and right is equalized, making it possible to
The vehicle travels straight without swaying left or right, and is in use as shown in FIGS. 1 and 2.

Similarly, when the next step bed 3 moves forward, the double sprocket 2
1 and 22 move forward, so the step bed 3 moves straight.

Note that both ends of the chains 13 and 18 are fixed to fasteners 15, 17, 19, and 20, respectively, so these fasteners control the tension of the chains and the engagement with the twin sprockets 11 and 12. The state can be easily adjusted and finely adjusted.

[Effect of idea]

The parallel ruler type guide mechanism that combines a chain and a sprocket allows the bed to move in a straight line, so when the bed is fed out, the straightness of the bed is maintained, and damage to the bed during movement is prevented, and Smooth operation is achieved.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the present invention with the step bed cut away, Fig. 2 is a longitudinal side view taken along the - line in Fig. FIG. 4 is an enlarged vertical cross-sectional side view of the main part of FIG. 2, and FIG. 5 is a vertical cross-section taken along the - line in FIG. 4. 6 are schematic side views showing conventional movable bleachers. 1...Movable bleachers, 2, 3, 4...Dan floor, 5,
6, 7...Top plate, 5a, 6a, 7a...Front plate, 5
b, 6b...rear plate, 5c, 6c, 7c...side plate,
8, 9... Vertical axis, 10... Mounting plate, 11, 12
...Double sprocket, 11a, 11b, 12
a, 12b... Sprocket, 13, 18... Chain, 14, 16... Horizontal plate, 15, 17, 1
9, 20... Fastener, 21, 22... Double sprocket, 23, 24... Chain.

Claims (1)

[Claim for Utility Model Registration] When not in use, the front tiers are nested one after another under the rear tiers, and when in use, each tier is moved forward to create a stepped structure. In the movable bleachers, a double sprocket consisting of a pair of horizontal upper and lower sprockets is installed near the rear edge of the frontmost tier, and the rear tier following this tier A pair of left and right chains facing in the front-rear direction, the front ends of which are fixed to the lower side of the front end of A tiered bed straight advancement device for movable bleachers, characterized in that a parallel ruler type guide mechanism is formed by winding each sprocket around the upper and lower sprockets and fixing the rear ends to both rear sides of the tiered floor.