JP3698005B2 - Mobile bleachers - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is provided with a plurality of stepped floors having different heights, and these stepped floors are configured to move forward and backward between a use position in the form of a platform and a storage position overlapping vertically. Regarding seats.
[0002]
[Prior art]
This type of mobile seat is suitable for use in multipurpose halls, theaters, gymnasiums, and the like because it has the mobility that each stepped floor can be stacked up and down when not in use.
[0003]
Conventionally, in order to deploy or superimpose each corrugated floor, a wheel is attached to a leg structure that supports the corrugated floor, and the corrugated floor can smoothly advance and retreat by rolling on the support floor surface. .
[0004]
[Problems to be solved by the invention]
However, if the wheel rolls on the support floor surface, the ground contact area of the wheel is small, so a large concentrated load acts on the support floor surface. If it is laid or has a relatively small surface hardness, there is a risk that a dent will be formed in the rolled part of the wheel or the surface of the support floor may be damaged.
[0005]
On the other hand, there is also known a structure in which a floor plate formed by hinge-connecting rectangular strip-shaped rigid plate materials is fed out in conjunction with the advancement and retreat of the step floor, and the wheels roll on the floor plate. In this case, the floorboard serves as a cushioning material, and can prevent the concentrated load from acting on the support floor surface.
[0006]
However, such a structure requires a separate mechanism for extending and retracting the floorboard in conjunction with the advancement and retraction of the corrugated floor, and such a mechanism tends to be complicated, so in terms of cost and production Disadvantageous. Furthermore, since the floorboard needs to have a certain thickness from the viewpoint of strength, the lowest step floor cannot be placed on the floorboard due to the height. Therefore, as for the lowermost floor, the wheel directly rolls on the support floor, and the problem that the rolling trace remains on the support floor cannot be completely solved.
[0007]
[Means for Solving the Problems]
The present invention has been made in view of such points, and an endless track mechanism is provided in the leg structure, and the endless track mechanism is configured to roll and move directly on the support floor surface, and concentrated load is applied to the support floor surface. This is intended to prevent the operation of the liquid crystal element with a simple configuration.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
That is, the mobile bleacher according to the present invention includes a plurality of stepped floors supported by the leg structure, and the stepped floors have a use position in the form of a platform and a storage position where they overlap vertically. And a plurality of leg structures are provided intermittently along the width direction of each step floor. And an endless track mechanism that rolls on the support floor surface and includes a pair of rotating wheels and a crawler belt wound between the rotating wheels, and the leg structure extends back and forth at the lower end portion. The base includes at least a pair of left and right side plates, and an endless track mechanism is provided between the front and rear portions of the base and disposed between the left and right side plates of the base. Match the longitudinal direction to the longitudinal direction Far body consisting configured to be moved up and down and the intermediate portion is rotatably supported by the leg structure the front and rear ends in opposite directions with a pair of swinging elements spaced each other comprising a placement the rotating wheels by rotatably supported respectively between the front end of the respective swinging element of the far body and between the rear end portion so as to pinch the rotary wheel between each swinging element The swinging body is rotatably supported on both side plates of the base by a support shaft.
[0009]
If it is such, since the lower part of a crawler belt will surface-contact with a support floor surface, loads, such as a step floor, will not concentrate on a support floor surface like the conventional wheel type thing .
[0010]
In addition, the structure is not much different from that of the existing wheel type, so it does not increase the difficulty of production or increase the cost, and can be realized by partial modification of the existing one. Can have an effect.
[0011]
Further, the endless track mechanism includes a swinging body configured such that the intermediate part is rotatably supported by the leg structure and the front end part and the rear end part can be moved up and down in opposite directions. Since the rotating wheels are rotatably supported by the front end portion and the rear end portion of the swinging body, it is possible to cope with the unevenness of the floor.
[0012]
Furthermore, since the base includes at least a pair of left and right side plates, and the endless track mechanism is disposed between the left and right side plates of the base, the leg structures that support the stepped floors when stored are in the width direction. In this case, it is possible to prevent the endless track mechanisms provided in the leg structures from interfering with each other and to make the leg structures as close as possible to each other, which makes it impossible to arrange the leg structures in the width direction. Can not be.
[0013]
In order to suitably cope with the unevenness of the floor, it is preferable that the endless track mechanism is configured so that the front end portion and the rear end portion can be moved up and down in opposite directions.
[0014]
In order to provide a plurality of endless track mechanisms on one leg structure and to make load distribution more remarkable, the leg structure includes a base extending in the front-rear direction at the lower end portion. Those provided at the front end portion and the rear end portion are desirable.
[0015]
In order to provide a plurality of endless track mechanisms on one leg structure and to make load distribution more remarkable, the leg structure includes a base extending in the front-rear direction at the lower end portion. Those provided at the front end portion and the rear end portion are desirable.
[0016]
In order to provide a plurality of endless track mechanisms on one leg structure and to make load distribution more remarkable, the leg structure includes a base extending in the front-rear direction at the lower end portion. Those provided at the front end portion and the rear end portion are desirable.
[0017]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0018]
FIG. 1 and FIG. 2 are overall right side cross-sectional views showing the movable bleacher seat 1 of the present embodiment in the unfolded state and the retracted state, respectively, near the center in the width direction. This movable bleacher seat 1 is formed by supporting stepped floors 2 having different heights from each other by a plurality of leg structures 3 that can move back and forth, and each of these stepped floors 2 is moved forward as shown in FIG. It is configured to be expandable and contractable between a use position P that has been expanded into a tiered shape and a storage position Q that is retracted rearward and stored in a storage space S as shown in FIG. It will be. Thus, when each leg structure 3 is retracted to the storage position Q, each leg structure 3 is superposed in the left-right direction and each step floor 2 is superposed in the vertical direction. . The drive system for advancing and retracting the leg structure 3 is the same as that of the conventional one, and the description thereof is omitted.
[0019]
As shown in FIG. 3, which is a rear perspective view in which the chair 24 is omitted, the leg structure 3 supports appropriate portions in the vicinity of both ends on the outside of the corrugated floor 2 and in an intermediate portion. As shown in FIGS. 3 and 4, the leg structure 3 includes a base 31, a post 32 erected integrally from the rear end portion of the base 31, and a front end slightly below the upper end of the post 32. It has a substantially U-shape in side view and includes a support arm 33 that extends and supports the load of the corrugated floor 2. Such a leg structure 3 is set so that the height of the leg structure 3 that supports the rear stage floor 2 is increased. A roller R is pivotally attached to the upper end of each leg structure 3, and the roller R is directly above. The support arm 33 of the next stage located at the position is supported by rolling contact.
[0020]
The corrugated floor 2 includes a front beam 21 that connects the tips 33a of the support arms 33, a rear beam 22 that is disposed at an appropriate position near the upper end of the post 32, and connects the posts 32, and the front beam 21 and the rear beam. And a flooring 23 placed on the support arm 33 so as to be positioned between the two. Thus, as shown in FIGS. 1 and 2, for example, a chair 24 supported by a drive shaft (not shown) so as to be able to be tilted up and down is disposed on each step floor 2. FIG. Is held in an upright position when deployed to the use position P shown in FIG. 2, and held in a lying position folded on the upper surface of the step floor 2 when the step floor 2 is retracted to the storage position Q shown in FIG. .
[0021]
In the mobile auditorium 1 having such a configuration, in this embodiment, as shown in FIGS. 3 to 6, an endless track mechanism 4 is provided on the base 31, and the endless track mechanism 4 is grounded to the support floor F. , Rolling. In the present embodiment, each endless track mechanism 4 is not provided with a driving means and does not exert its own driving force.
[0022]
The endless track mechanism 4 is supported by the base 31 so as to be pivotable, and can move the front end portion and the rear end portion up and down in opposite directions, and the front end portion and the rear end portion of the swing body 43 rotate respectively. A pair of rotating wheels 41 supported in a possible manner and crawler belts 42 wound around these rotating wheels 41 are provided between the side plates 31a and 31b of the base 31 and at the front and rear ends thereof. Each is provided.
[0023]
More specifically, the swinging body 43 is formed of a pair of swinging elements 43a and 43b that are formed in a rectangular plate shape and are spaced apart from each other with the longitudinal direction coincided with the front-rear direction. Each swinging element 43a, 43b has a middle upper end supported on the base side plates 31a, 31b by a support shaft S1 so as to be rotatable.
[0024]
The rotating wheel 41 has a drum shape in which a plurality of meshing teeth 41a meshing with the crawler belt 42 are provided at regular intervals. Then, the swinging elements 43a and 43b are rotatably supported on the support shaft S2 spanned between the front end portions and the rear end portions of the swinging elements 43a and 43b, and are sandwiched between the swinging elements 43a and 43b. It is arranged.
[0025]
The crawler belt 42 is referred to as a caterpillar, and is formed by connecting a rectangular strip-like rigid plate 42a that is long on the left and right sides to each other by a hinge. For example, each rigid plate 42a is provided with a meshing recess 42b that meshes with the meshing teeth 41a.
[0026]
Further, between the rotating wheels 41, a pair of auxiliary rotating wheels 44 rotatably provided on the swinging bodies 43a and 43b via a support shaft S3 are provided, and these auxiliary rotating wheels 44 are provided at the lower inner periphery of the crawler belt 42. 42d is configured to suppress the upward movement of the ground contact portion 42c of the crawler belt 42 and to maintain the tension of the crawler belt 42.
[0027]
Therefore, according to the present embodiment having the above-described configuration, the lower surface 42c of the crawler belt 42 is in surface contact with the support floor surface F, and the load on the corrugated floor 2 is dispersed and acts on the support floor surface F. It becomes possible to prevent as much as possible a defect such as a dent or a scratch on F. In addition, the structure is not much different from that of the existing wheel type, so it does not increase the difficulty of production or increase the cost, and can be realized by partial modification of the existing one. Can have an effect. Furthermore, since the endless track mechanism 4 is provided at the front end portion and the rear end portion of the base 31 constituting each leg structure 3, the load distribution effect can be more remarkably exhibited.
[0028]
Further, in the present embodiment, the endless track mechanism 4 is configured such that the front end portion and the rear end portion can be moved up and down in opposite directions, so that the support floor can be moved as shown in FIG. Even if the surface F is uneven, the attitude of the endless track mechanism 4 changes in accordance with the inclination, and the lower surface of the crawler belt 42 can always be in surface contact with the support floor surface F3.
[0029]
Further, since the auxiliary rotating wheel 44 constituting the endless track mechanism 4 suppresses the upward movement of the portion 42c to be grounded of the crawler belt 42, the substantially entire lower surface 42c of the crawler belt 42 is always in contact with the support floor surface F. It becomes possible. Therefore, it is possible to more reliably prevent the concentrated load from acting on the support floor surface F.
[0030]
On the other hand, since the endless track mechanism 4 that performs such a load dispersion action is disposed between the left and right side plates 31a and 32a of the base 31, the leg structures 3 that support the corrugated floors 2 at the storage position Q are connected to each other. When arranged in the width direction, it is possible to prevent the endless track mechanisms 4 provided in the leg structures 3 from interfering with each other. In addition, since the leg structures 3 can be as close as possible to each other, it is possible to prevent unreasonable occurrence in the arrangement setting of the leg structures 3 in the width direction.
[0031]
The present invention is not limited to the above-described embodiments. For example, each base may be provided with one infinite drive mechanism with a large depth dimension extending from the front end portion to the rear end portion, or depending on the load distribution condition, only at the site where the load acts heavily. An infinite drive mechanism may be provided and the others may be configured with wheels or the like. Further, an infinite drive mechanism may be provided outside the base.
[0032]
In addition, various modifications can be made without departing from the spirit of the present invention.
[0033]
【The invention's effect】
As described in detail above, according to the present invention, the bottom surface of the crawler belt is in surface contact with the support floor surface, and the load on the step floor is dispersed and acts on the support floor surface, so that a dent or scratch remains on the support floor surface. Such a problem can be prevented as much as possible. In addition, the structure is not much different from that of the existing wheel type, so it does not increase the difficulty of production or increase the cost, and can be realized by partial modification of the existing one. Can have an effect.
[0034]
Further, the endless track mechanism includes a swinging body configured such that the intermediate part is rotatably supported by the leg structure and the front end part and the rear end part can be moved up and down in opposite directions. Since the rotating wheels are rotatably supported at the front end portion and the rear end portion of the swinging body, it is possible to realize an endless track mechanism whose posture can be changed with a simple configuration.
[0035]
Further, in the storage position, the leg structures supporting the corrugated floors are arranged in the width direction, but the base constituting the leg structure includes at least a pair of left and right side plates, and the endless track Since the mechanism is disposed between the left and right side plates of the base, it is possible to prevent the endless track mechanisms provided in the leg structures from interfering with each other at the storage position. Moreover, the leg structures can be made as close to each other as possible so that the arrangement of the leg structures in the width direction does not become unreasonable. In addition, since a plurality of leg structures are provided intermittently along the width direction of each step floor, the load on the support floor can be further dispersed.
[0036]
If the endless track mechanism is constructed so that its front end and rear end can be moved up and down in opposite directions, it can tilt even if the support floor is uneven. Since the attitude of the endless track mechanism changes according to the situation, the lower surface of the crawler belt can always be in surface contact with the support floor surface.
[0037]
If the leg structure has a base extending in the front-rear direction at the lower end portion, and the endless track mechanism is provided at the front end portion and the rear end portion of the base, a plurality of one leg structure is provided. The endless track mechanism can be provided to exert the load dispersion effect more remarkably.
[0038]
If the endless track mechanism is provided between the rotating wheels and has an auxiliary rotating wheel that touches the portion of the crawler track to be grounded from above and suppresses the upward movement of the grounded portion, the entire surface of the lower surface of the crawler track Can always come into contact with the support floor, and it is possible to prevent the concentrated load from acting more reliably.
[0039]
If the endless track mechanism does not exert its own driving force, it is possible to promote the simplification of the structure and the bottom cost while achieving the purpose of preventing the concentrated load from acting on the support floor surface.
[Brief description of the drawings]
FIG. 1 is a schematic sectional side view showing a use position of a moving bleacher seat in one embodiment of the present invention.
FIG. 2 is a schematic cross-sectional side view showing a storage position of a moving seat in the embodiment.
FIG. 3 is a rear perspective view showing a part of a moving seat in the embodiment.
FIG. 4 is a partially broken side view showing the endless track mechanism in the same embodiment.
FIG. 5 is a longitudinal sectional view showing an endless track mechanism in the embodiment.
FIG. 6 is a partially broken side view showing the endless track mechanism in the same embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Mobile auditorium 2 ... Step floor 3 ... Leg structure 31 ... Base 31a, 31b ... Side plate 4 ... Endless track mechanism 41 ... Rotating wheel 42 ... Crawler belt 43 ... Swing body 44 ... Auxiliary rotating wheel P ... Use position Q ... Storage Position F ... Support floor

Claims (5)

It is equipped with a plurality of stepped floors supported by the leg structure, and these stepped floors move forward and backward on the support floor surface between a use position that forms a platform and a storage position that overlaps vertically. Configured so that the leg structure is provided intermittently along the width direction of each step floor ,
The leg structure includes a pair of rotating wheels and a crawler belt wound between the rotating wheels, and is provided with an endless track mechanism that rolls on the support floor, and
The leg structure has a base extending in the front-rear direction at the lower end, the base includes at least a pair of left and right side plates, and an endless track mechanism is provided at each of the front and rear portions of the base and the left and right side plates of the base. Placed between
The endless track mechanism consists of a pair of swaying elements that are spaced apart from each other with the longitudinal direction aligned with the front-rear direction, and the middle part is rotatably supported by the leg structure so that the front end part and the rear end part are opposite to each other. comprising a far body consisting configured to be moved up and down in the direction, the rotation wheel is rotatably supported, respectively, the rotating between the front end of each swinging element of the far body and between the rear end portion Place the ring so that it is sandwiched between each swing element ,
A movable bleacher seat characterized in that the swinging body is rotatably supported on both side plates of a base by a support shaft. 2. The mobile seat according to claim 1, wherein the endless track mechanism is configured to be able to swing by moving the front end portion and the rear end portion in the opposite directions. The traveling bleachers according to claim 1 or 2, wherein an endless track mechanism is provided at each of a front end portion and a rear end portion of the base. 4. The endless track mechanism includes an auxiliary rotating wheel that is disposed between the rotating wheels and comes into contact with a portion of the crawler belt to be grounded from above and suppresses the upward movement of the grounding portion. Moving bleachers. The moving bleacher according to claim 1, 2, 3, or 4, wherein the endless track mechanism does not exert its own driving force.

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