JPH0333895Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to retractable, stair-type movable bleachers installed in gymnasiums, etc. More specifically, the present invention relates to movable bleachers that are extendable and retractable and are installed in gymnasiums and the like. This relates to the improvement of a trolley that supports a single seat and rolls on the floor when expanding or contracting to facilitate smooth movement.

Recently, movable seats have been increasingly installed in gymnasiums and the like in addition to fixed seats in order to use them for multiple purposes.

Generally speaking, movable seats are made by connecting and combining multiple single seats with deck heights increasing sequentially starting from the front row. When in use, these seats are extended and arranged in a stair-like manner. When not in use, the front seats are moved to the rear seats. A storage room in which all the individual spectator seats are sequentially stored in the single unit at the rear so that they form a shelf-like appearance, and in this state, they are attached to the wall or formed inside the wall. Usually, the structure is such that it expands the space above the floor by enclosing it in the space.

These movable seats are equipped with multiple seats per deck, and when in use, each seat has a trolley with wheels to carry the weight of a large number of spectators and the structure that supports them. Normally, it is moved forward or backward depending on the direction.
In order to stably support the stand alone, this trolley generally has a frame as its main body and is usually equipped with at least one wheel at each end of the frame.

The movable seats that extend and contract in this way are each supported by a wheel, and the rolling of these wheels allows for smooth movement. During use, the axle may fall off or break and the wheel may come off, and if you extend or retract the bleachers without noticing this, the frame may fall and cause damage to the floor surface, or the wheel may fall off during use. There was a risk that the deck would tilt due to the weight of the audience, causing unforeseen confusion.

This invention is designed to prevent damage to the wheels of such trolleys.
This system was devised to improve this problem in view of the dangers caused by falling off, etc. The frames of the trolleys of the front and rear individual seats are connected to each other with connecting fittings so that the frames of the trolleys can slide freely, and the wheels of one of the trolleys are If the deck falls off, etc., it is held by the other truck via the connecting metal fittings to avoid tilting of the truck, preventing contact with the floor surface or tilting of the deck, and also by connecting with the connecting metal fittings. To provide a movable bleacher seat which is made solid by improving the integrity and interlocking of the front and rear bleachers, and which allows smooth expansion and contraction operations.

This invention will be explained below with reference to illustrated embodiments,
Its features will be explained in detail.

FIG. 1 is a perspective view showing the main parts of the present invention, in which 1 is the frame of the truck, 2 is the wheels installed on the lower surface of both the front and rear ends of the truck, and 3 is the support column raised from the upper surface of the rear end of the frame. Reference numeral 4 denotes a connecting fitting fixed by welding to the front end of the frame. Note that although the drawing shows one carriage portion of the stand alone that constitutes the movable stand, the other part is completely the same, so illustration and description thereof will be omitted.

As shown in the figure, the bogie frame 1 is a metal frame with a channel-shaped cross section, with the opening 5 facing outward, and bearings 7 and 8 for supporting wheels 6 are installed at the front and rear ends of the lower surface. The wheels 2 are welded and mounted on each axle.

The connecting fitting 4 fixed to the front end of the truck frame mainly has a flat mounting plate 4a large enough to cover the end of the frame 1, and has a T-shaped engagement claw 4b at the tip from one side thereof. The engaging piece 4c is extended inwardly by welding the mounting plate portion 4a to the end of the frame,
While pushing the engagement claw 4b at the tip into the opening 5 of the adjacent frame 1, the upper and lower edges 5 of this opening 5
a, 5a are engaged with the neck portion of the engaging pawl 4b so that it can freely slide in the length direction of the opening 5 using this edge as a guide.

In addition, each of the above-mentioned individual truck frames 1 is arranged in parallel with its longitudinal direction facing the front-rear direction in which the movable spectator seats extend and contract, and each frame has a side opening 5 located outside the truck frame, i.e. The connecting fittings 4 provided on the trolley frame of the rear bleachers are engaged with each other to connect them to each other.

The present invention is constructed as described above, and each single trolley frame rolls the wheels 2 provided at the front and rear during normal movement operations, that is, during forward operation when in use and backward storage operation when not in use. The robot moves forward and backward on the floor, and during this time the connecting fittings 4 are slid along the openings 5 to ensure mutual connection at all times.

If a wheel falls off due to damage or falling off during this moving operation or during use, in other words, if a wheel is missing as shown in Figure 1, conventionally, the trolley frame The end of the deck may fall down and cause damage to the floor due to the bearings or the frame hitting the floor directly, and when in use, the entire deck may tilt due to the tilt of the trolley frame, making it difficult for spectators. However, with this invention, it is always connected to the adjacent frame using the connecting metal fittings, which prevents it from falling, so it can be prevented from falling if the floor is damaged or the deck tilts. It is possible to effectively avoid such dangers.

In addition, when the present invention moves by extension or contraction, the moving frame is guided by the adjacent frame that stops movement via the connecting fittings, which prevents it from wobbling in the left-right direction and allows it to move correctly in the front-back direction. , which has the advantage of being able to accurately extend and retract each individual seat.

In the above embodiments, the connecting fittings are provided at the front end of the truck frame, but they may also be provided at the rear end of the frame. In this case, the connecting fitting 4 is attached to the rear end of the truck frame located on the inside, that is, the front truck frame, with the engaging claw 4b facing outward, and An opening 5 is formed in the inner side surface of the truck frame along the length direction, and the opening 5 is engaged with the opening 5. Of course, in this case, it goes without saying that the same effects as those of the previous embodiment can be expected.

[Brief explanation of drawings]

The drawing shows one embodiment of the present invention.
The figure is a perspective view of the main part, FIG. 2 is a partially sectional plan view of the main part during an extension operation, and FIG. 3 is a partially sectional plan view of the main part during storage.
1...Dolly frame, 2...Wheels, 3...Struts,
4... Connecting metal fitting, 4c... Engagement piece, 5... Opening of truck frame.

Claims (1)

[Scope of utility model registration request] The height is increased sequentially from the front deck to the rear deck, and the front deck can be stored by retracting it below the next deck, while it can be pulled out from the front deck and extended in a step-like manner. In a stair-type movable bleacher made by connecting a plurality of bleacher seats, the trolley frame with the wheels of each bleacher seat is made of a long material, with its length oriented in the front-rear direction, and one side facing The opening is formed into a channel shape, and a connecting metal fitting from which an engaging piece protrudes sideways is provided at one of the front and rear ends of the opening, and the engaging piece of the connecting metal fitting is attached to the trolley frame of the adjacent stand alone. A trolley for a stair-type movable bleachers, characterized in that the trolley is engaged with the opening of the platform, and the adjacent trolley frames are slidably connected to each other in the longitudinal direction.