JPH0427962Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] When in use, the present invention can be deployed in a stair-like manner, and when not in use, it can be used within the single uppermost bleacher seat and the lower tier. In the retractable stair-shaped bleachers (hereinafter simply referred to as bleachers) that can store all of the bleachers individually, the front part of the floor platform of each tier is made so that it does not become cantilevered. This invention relates to a device for ensuring reliable support on a lower floor platform.

[Conventional technology]

Figure 4 schematically shows an example of conventional seats of this type, with A, B, C, D, and E representing individual seats;
1 is a cart, 2 is a support, 3 is a floorboard, and 4 is a bench provided at the front end of the floorboard.

When this type of bleachers are fully expanded, the rear ends of the floorboards 3 of the individual seats B, C, D, and E in the second and higher tiers are connected to the left and right columns 2 or the column members connecting them ( (not shown), and the front end is supported by riding on the pillars 2 of the individual seats A, B, C, and D directly below.

However, when the number of spectators is small due to the nature of the event, the seats A and B in the middle and lower rows can be stored while the seats C, D, and E in the upper rows are stored, as shown in Figure 4. may be expanded and used only.

In such a case, the front ends of the floorboards 3 of the individual seats B and C may hang down in a cantilevered state because the pillars 2 of the lower seats A and B are not present below them. , in this state,
When a large number of spectators move on the single bleacher seat C, the floorboard 3 tilts forward and downward, creating a danger of the spectators falling forward.

Note that by supporting both sides of the front end of the floorboard 3 of each stage with pillars (not shown) erected on the trolley 1, the front end of the floorboard 3 may be prevented from becoming cantilevered. In this case as well, the floor plate 3
Since the length in the left and right direction is long, it is inevitable that the central part of the front end will sag.

To prevent this, for example,
As described in Japanese Patent No. 177845, there is a system in which auxiliary spots are fixed to the front surface of the floor plate of each stand alone stand and the front end floor plate in the retracted state to fix the front end floor plate.

Further, Japanese Utility Model Application Publication No. 62-54153 discloses a system in which a plurality of tiers of individual seats are moored to each other so that they can move as a unit depending on the content of the event.

[The problem that the idea attempts to solve]

The auxiliary spot described in the above-mentioned Japanese Utility Model Publication No. 62-177845 is extremely troublesome to install and remove, and is unsightly in appearance.

In addition, such auxiliary spots were introduced in the above-mentioned U.S.
-As disclosed in Publication No. 54153, if the number of tiers of individual seats to be moored can be selected depending on the content of the event, the number of tiers of seats to be moored can be selected. There is a problem in that a large number of auxiliary spots of different heights must be prepared accordingly.

The present invention aims to solve these problems.

[Means to solve the problem]

In this invention, a lifting leg can be freely raised and lowered on the front lower surface of the upper tier of a pair of vertically adjacent single seats, so that it comes into contact with the upper surface of the lower tier by lowering and receives the load from the front end of the upper tier. Drive means is provided at a suitable position on the underside of the upper tier and lowers the elevator leg by contacting a part of the lower tier when the lower tier retracts, and raises the elevator leg when the lower tier moves forward. By providing this, the above-mentioned problem is solved.

[Function] According to the device of the present invention, key points on the lower front of each individual bleacher seat in the retracted state are automatically supported by the lifting legs by always riding on the upper front portion of the single bleacher seat directly below. Even if only the upper seats are deployed and used, the front end seats will be securely supported by the seats directly below and will not be shaken by the movement of spectators. .

〔Example〕

Figure 1 shows the main parts of the bleachers to which the present invention has been applied in the state shown in Figure 4, with the support column 2 omitted, and each member is the same as that shown in Figure 4. are given the same reference numerals and the description thereof will be omitted.

As shown in FIG. 1, a support 11 facing in the front-rear direction and having a downward U-shape in the front is fixed to a key point on the front of the lower surface of the floorboard 3 of a stand alone seat other than the lowest row (for example, D). has been done.

Slanted holes 12 facing rearward and downward are bored in both sides 11a, 11a of the support 11, and a guide piece 13 facing rearward and having a rear end bent downward is provided at the rear end of the upper surface of the support 11. A guide hole 14 is bored in the guide piece 13 .

A rectangular box-shaped elevating leg 15 is fitted into the support 11, and an engagement pin 1 is provided laterally through the elevating leg 15.
Both ends of the elevating leg 6 engage with the inclined hole 12, and the lower end of the elevating leg 15 always projects downward from the support 11.

A connector 17 having a rearward U-shape in plan view is fixed to the rear surface of the lifting leg 15, and both side pieces 17a,
Vertical holes 18 are symmetrically bored in 17a.

A drive rod 20 facing in the front-rear direction is supported in the guide hole 14 of the guide piece 13 and in the support piece 19 vertically disposed on the lower rear part of the floor plate 3 so as to be movable back and forth.

Lateral engagement pin 21 fixed to the front end of the drive rod 20
is engaged with the vertically elongated hole 18 of the connector 17, and the drive plate 22, which is also vertically installed at the rear end, extends below the upper end of the support member 23 at the rear end of the floor plate 3 of the stand alone (for example, C) directly below. It hangs down and is biased forward by a compression spring 24 wound between the engagement pin 21 and the lower end of the guide piece 13.

Therefore, when the seats are unfolded like the seats C and D shown in Fig. 1, the drive rod 2 of the seats D is
0 is located at the front limit due to the bias of the spring 24, and the elevating leg 15 located at the front upper limit rides on the support member 21 of the single seat C to prevent the single seat D from shaking.

Although not shown in the drawings, when the lower bleacher seats are moved backward for storage, the rear end of the floorboard 3 comes into contact with the drive plate 22 of the upper bleacher seats.

When the seats B and C shown in FIG. 1 are stacked vertically, the driving rod 2 of the seat C is
0 retreats to the rear limit against the spring 24, and the elevating leg 15 that has descended to the rear lower limit contacts the bench 4 of the single bleacher seat B to prevent the single grandstand seat C from shaking.

The above describes the operation of individual seats B, C, and D, but all of the individual seats A~
E operates similarly.

In the above embodiment, the driving rod 20 and the compression spring 24 form a driving means for raising and lowering the elevating legs 15 in accordance with the retreat of the lower seats B, C, D, . . . This driving means is, for example, one in which the driving rod 20 is replaced with a wire,
As the lower bleachers move forward and backward, a gear is rotated to raise and lower the elevating legs.

[Effect of idea]

According to the present invention, key points on the lower surface of each single bleacher seat in the retracted state are automatically supported by the lifting legs by always riding on the upper front portion of the single bleacher seat directly below.

Therefore, if an appropriate number of devices of the present invention are used in accordance with the side length of the individual seats, even if the upper part of the seats is expanded to the desired level, the individual seats at the front end will be It is securely supported by the stand directly below the stand, and will not be shaken by the movement of spectators.

Furthermore, it is possible to prevent the front part of the floorboard from hanging down in a cantilevered manner when all the seats are stored alone.

[Brief explanation of drawings]

Figure 1 shows the main parts of the bleachers to which this invention is applied.
FIG. 2 is an enlarged side view showing the support column omitted, FIG. 2 is an enlarged central vertical sectional side view of the device of the present invention, FIG. 3 is a sectional view taken along the line X-X of FIG. 2, and FIG. FIG. A, B, C, D, E single seat, 1... trolley,
2... Support, 3... Floorboard, 4... Bench, 5...
Floor surface, 6...Rail, 7...Gap, 11...Support, 11a...Side piece, 12...Slanted hole, 13...
Guide piece, 14... Guide hole, 15... Lifting leg, 16
...Engagement pin, 17...Connector, 17a...Side piece, 18...Elongated hole, 19...Support piece, 20...
Drive rod, 21... Engagement pin, 22... Drive plate, 2
3... Support member, 24... Compression spring.

Claims (1)

[Scope of Utility Model Registration Claim] (1) A front-facing gate-shaped vehicle with different widths and heights, consisting of a pair of left and right carts that run front and back, with support columns installed, and a floor plate between the upper ends. A single bleacher seat,
When in use, the lower tier individual seats unfold forward in a step-like manner, and when not in use, the front tier individual seats are retracted and stored within the largest individual upper tier. In linked retractable stair-shaped bleachers, a pair of vertically adjacent single seats is placed on the front of the lower surface of the upper tier by lowering to come into contact with the upper surface of the lower tier, thereby reducing the load on the front end of the upper tier. A lifting leg is provided that can be raised and lowered freely, and is placed at a suitable place on the underside of the upper tier.When the lower tier retreats, it contacts a part of the lower tier and lowers the lifting leg, and when the lower tier moves forward, the lifting leg 1. A floor plate support device for a telescoping staircase-shaped bleachers, characterized in that it is provided with a drive means for raising the floorboards. (2) The elevating legs are installed so as to be able to slide along inclined holes that are inclined downward after being bored in both sides of a support fixed to the lower surface of the single upper bleacher seat;
and the drive means is a drive facing in the front-rear direction, the front end of which is connected to the lifting leg, and the rear end of which is provided with a drive plate that abuts against the rear end and moves rearward when the lower bleachers are moved backwards. The rod and
2. A floor plate support device for a retractable staircase-like audience seat according to claim 1, comprising a spring that constantly biases the elevating legs toward the front.