Outdoor self-cleaning seat and playground stand adopting same

Abstract

The utility model relates to an outdoor self-cleaning seat and a playground stand adopting the same. The self-cleaning outdoor chair is provided with a chair seat and a chair back, and can be provided with armrests fixedly connected with the chair seat or connected with the chair back in a foldable manner, self-cleaning coatings are arranged on the surfaces of the chair seat, the chair back and the armrests, and the self-cleaning coatings at least cover the upper surface of the chair seat, the front surface of the chair back and the upper surfaces and the side surfaces of the armrests. The stadium stand is provided with a step-shaped stand body, a plurality of seats are fixedly installed on the stand body and are the outdoor self-cleaning seats, supporting rods extending forwards are fixedly arranged on the step vertical face of the stand body, and the seats are fixedly installed on the supporting rods through installation connecting pieces and are in a suspended shape. The seat disclosed by the utility model can be used outdoors, has a certain self-cleaning function, and is beneficial to reducing the workload and the working difficulty of cleaning the seat.

Description

Technical Field

[0001] The utility model relates to an outdoor self-cleaning seat and a sports field stand using the seat. The seat can be mainly used in sports fields and can also be used in other suitable occasions. Background Art

[0002] Existing seats used in outdoor places such as stadium stands can be made of rubber and plastic materials. Usually, the seat and the backrest can be formed into one piece to form the seat body, and brackets used as chair legs are set under the seat body. For large-scale use of seats such as stadium stands, embedded parts for installing seats can be set on the concrete foundation, and the seat body can be fixed to the embedded parts. Seats made of this material are not only easy to process, but also can better adapt to outdoor temperature changes and environmental conditions such as sun and rain by selecting suitable polymer materials, with a long service life and low maintenance costs.

[0003] However, under outdoor conditions, dust often accumulates on the seats, and cleaning staff need to manually scrub them. Especially for occasions such as stadium stands where seats are used on a large scale and may be idle for a long time, the scrubbing workload is large, difficult, and labor-intensive. Therefore, it is necessary to develop new products that can reduce the workload and difficulty of the work.

[0004] On the other hand, the self-cleaning technology of object surfaces has been applied in the National Aquatics Center and several other occasions. The self-cleaning coating technology for hard plastic surfaces has also made certain progress. For example, Chinese patent document CN111909593A discloses a self-cleaning composite coating material for PP plastic surface and its preparation method, and CN105670565A discloses a self-cleaning material with self-repairing function and its preparation method. These technical achievements make it possible to reduce the workload and difficulty of outdoor seat cleaning. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the utility model provides an outdoor self-cleaning seat and a stadium stand using such a seat. Such a seat can be used outdoors and has a certain self-cleaning function, which helps to reduce the workload and difficulty of cleaning the seat.

[0006] The technical solution of the utility model is: a self-cleaning outdoor chair, provided with a seat and a backrest connected to each other, the backrest is located at the rear side of the seat, the surfaces of the seat and the backrest are provided with a self-cleaning coating, and the self-cleaning coating at least covers the upper surface of the seat and the front surface of the backrest.

[0007] Preferably, the seat and the backrest are integrally formed to form an integrated structure, constituting the seat body.

[0008] Preferably, a drainage hole is provided on the seat.

[0009] Preferably, the back side of the integrally formed seat and chair back is provided with reinforcing ribs, and the reinforcing ribs are arranged symmetrically on the left and right.

[0010] Preferably, there are armrests, two of which are installed on both sides of the seat and are fixedly connected or foldably connected to the seat. The so-called foldable connection is a movable connection that allows the armrests to be lifted to a use state and folded to the sides of the seat. The surface of the armrests is provided with a self-cleaning coating, which at least covers the upper surface of the armrests and may or may not cover the side surfaces of the armrests.

[0011] Preferably, the armrest and the seat are foldably connected in the following manner: two connecting rods are provided between the armrest and the corresponding side surfaces of the seat, the two connecting rods are distributed front and back, the two ends of the connecting rods are respectively hinged to the corresponding armrest and seat side surfaces, and the direction of the hinge axis is horizontal.

[0012] The armrest, the seat and the corresponding two connecting rods form a parallel four-bar linkage.

[0013] Preferably, the hinge adopts a rotating connection structure with a shaft and a hole or an articulated connection piece with a shaft and a hole.

[0014] An intermediate layer is provided between the self-cleaning coating and the main surface of the component (seat, backrest or armrest, including a seat and backrest of an integral structure) on which it is located; or, no intermediate layer is provided between the self-cleaning coating and the main surface of the component on which it is located; or, an intermediate layer is provided between the self-cleaning coating and part of the main surface of the component on which it is located, and no intermediate layer is provided between the self-cleaning coating and the main surface of the remaining part of the component.

[0015] The intermediate layer is made of a material that has good bonding performance and strength with both the body surface of the component and the self-cleaning coating, and can be provided when necessary according to the characteristics of the relevant component and coating material.

[0016] The self-cleaning surface coating is preferably made of a wear-resistant and weather-resistant material, and / or a material with a self-repairing function.

[0017] Preferably, the upper surface of the seat is provided with a surface with a convex-concave structure designed according to ergonomics, including a first concave surface corresponding to the legs and a second concave surface corresponding to the legs, the number of the second concave surfaces is two, which are located on the front side of the seat and are symmetrical on the left and right, the number of the first concave surface is one, which is located in the lateral middle part of the rear side of the second concave surface, and the lowest point of the second concave surface is provided with a drainage hole that passes through the seat.

[0018] Preferably, the hole wall of the drainage hole is provided with a self-cleaning coating, and the self-cleaning coating arranged on the hole wall of the drainage hole is connected to the self-cleaning coating arranged on the upper surface of the seat without leaving a gap therebetween.

[0019] Preferably, a human body sensor is provided on the chair back.

[0020] A sports field stand using outdoor self-cleaning seats is provided with a stepped stand on which a plurality of seats are fixedly installed. The seats are divided into multiple rows, with each row of seats being alternately distributed front to back. In adjacent rows of seats, the installation height of the rear row of seats is higher than that of the front row of seats. The seats are any of the outdoor self-cleaning seats disclosed in the utility model.

[0021] Preferably, each step of the stand corresponds to a row of seats, and other arrangements may also be used depending on actual conditions.

[0022] Preferably, a support rod extending forward is fixedly provided on the stepped facade of the stand, and the seats are fixedly mounted on the support rod via mounting connectors in a suspended state.

[0023] Preferably, the mounting connector is a column, the bottom of which is fixed to the front of the support rod, and the top of which is fixedly connected to the bottom surface of the seat.

[0024] Preferably, a plurality of supporting slats are provided on the top of the column, and the supporting slats are distributed at equal angular distances in the circumferential direction, and the inner ends of the supporting slats are fixedly connected to the top end of the column, and the outer ends are fixedly connected to the bottom surface of the seat.

[0025] The beneficial effects of the utility model are as follows: since a self-cleaning surface coating is provided, the self-cleaning surface coating covers areas where dust may fall, such as the upper surface of the seat, the front surface of the chair back and the upper surface of the armrests; based on the characteristics of the self-cleaning coating, the dust has very weak adhesion to the coating surface and is easy to clean; when the seat is idle for a long time, the dust deposited on the surface of the seat will be washed away by rainwater, and even without manual cleaning, thick dust accumulation is not likely to occur; since an intermediate layer can be provided according to actual needs, it is beneficial to ensure or improve the firmness of the self-cleaning coating on the seat surface, reduce or avoid peeling or shedding of the coating, and reduce related maintenance costs. The armrests are provided to improve the comfort of users. Since the armrests are foldable, the audience (users) can lift the armrests and use them as normal armrests after taking their seats, avoiding the negative feelings caused by the lack of armrests, which helps to improve the comfort of users. When leaving the venue or for some reason (for example, someone passes by in front of the seats), the armrests can be folded down. The folded armrests are basically flush with the seats, avoiding the obstruction that may be caused by the armrests. Since limit structures corresponding to the two states of the armrests being raised and folded are provided, the armrests can be positioned in each state, so that the armrests are kept in the best position in the corresponding state. Since the connecting rod is in a top-rearward or vertical posture in the armrest raised state, the pressure on the armrests presses the connecting rod toward the corresponding limit structure (limit block) or at least does not push the armrests to fold downward, which is conducive to maintaining the stability of the armrests. The design of the elastic positioning pins The arrangement further improves the stability of the armrests; the one-piece seat body is adopted, and reinforcing ribs are arranged on the seat body, which is conducive to improving the firmness of the seat body and ensuring the service life; the ergonomic design of the seat body helps to improve the comfort and reduce the damage to the audience caused by long-term sitting and watching; since the seat is installed on the forward support rod, the bottom of the seat is suspended, which greatly facilitates the cleaning and maintenance of the venue; since the lowest part of the first concave surface is provided with a drainage hole, rainwater falling on the seat on rainy days will automatically flow out through the drainage hole; since a close-range human body sensor is arranged on the back of the chair, a human body sensor signal related to whether there is someone in the seat can be provided when necessary, which can be used to detect and count the audience and the distribution of the audience in the stands. If necessary, it can also be compared with the seat number and the ticket inspection / entrance information to analyze the situation of the audience entering the venue according to the seat number on the ticket. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the related structure of the self-cleaning coating;

[0027] Figure 2 is a schematic diagram of an integrated seat and backrest;

[0028] Figure 3 It is a schematic diagram of the convex and concave structure of the upper surface of the seat;

[0029] Figure 4 It is a schematic diagram of outdoor seating;

[0030] Figure 5 A diagram of another type of outdoor seating;

[0031] Figure 6 It is a schematic diagram of the stadium stands;

[0032] Figure 7 It is a schematic diagram of the connection structure between the column and the bottom of the seat;

[0033] Figure 8 It is a schematic diagram of the structure in which the lower end of the seat connecting rod is hinged to the side of the seat;

[0034] Fig. 9 It is a schematic diagram of the structure in which the upper end of the seat connecting rod is hinged to the armrest;

[0035] Fig.10 It is another structural schematic diagram in which the upper end of the connecting rod is hinged to the handrail. DETAILED DESCRIPTION

[0036] See also Figure 1 , according to the needs, the self-cleaning coating is applied on the main body surface of each relevant part (parts with self-cleaning coating, such as seat, backrest, or seat and backrest of integrated structure, armrest, connecting rod, etc.) 1 to form a self-cleaning coating 3 covering the surface, and the self-cleaning coating can be applied on all upward surfaces of the part (including oblique upward surfaces), and can also be applied on the vertical surface of the part, and even on the downward surface of the part (including oblique downward surfaces). Figure 1 In the embodiment shown, the self-cleaning coating 3 is applied on both the upper and lower surfaces of the component (part).

[0037] The self-cleaning coating should have good bonding performance with the main body surface of the component and be able to maintain for a long time. It can be appropriately selected according to the characteristics of the main body material and the coating. If necessary, the intermediate layer 2 can be first coated on the main body surface of the component, and then the self-cleaning coating 3 can be coated on the surface of the intermediate layer 2. The intermediate layer should have good bonding performance with the main body surface of the component and the self-cleaning coating. Therefore, through the setting of the intermediate layer, the self-cleaning coating can be more firmly and durable on the component.

[0038] See also Figure 2-10 The outdoor self-cleaning chair 10 includes a seat 12 and a backrest 11, which can generally be made of polymer plastic material, or plastic or rubber plastic material. In this case, the seat and the backrest are preferably integrally formed to form an integrated structure (which can be called a seat body) (see Figure 2 ).

[0039] According to actual needs, the two sides (left and right sides) of the seat may be provided with armrests 20, or may not be provided with armrests. When armrests are provided, the armrests on each side may be fixedly mounted on the seat, or may be foldably mounted on the seat. Such armrests foldably mounted on the seat may be called foldable armrests, and the armrests may be lifted up to a normal use state when in use (see Figure 4 and Figure 5 ), lower the armrests to the sides of the seat when not in use.

[0040] In consideration of the audience's comfortable sitting posture and the beauty of the seat itself, a concave structure is provided in the lateral central area of ​​the middle and rear part of the upper surface of the seat to form a first concave surface 15 corresponding to the buttocks. The lowest point of the first concave surface is arranged in the middle and rear part of the first concave surface. The lowest point can be recessed by about 2 cm relative to the highest point of the seat. The lowest point is provided with a drainage hole 18 with a diameter of about 15 mm, and the drainage hole is about 15 cm away from the rear end edge of the seat (or the rear end edge of the seat part in the integrated structure).

[0041] The front edge of the seat is provided with two symmetrical concave structures, forming two second concave surfaces 13, corresponding to the legs, and between the two second concave surfaces is a relative ridge-like protrusion, the surface of the ridge-like protrusion can be called a front convex surface, and the highest point of the front convex surface is at the same height as the left and right edges of the seat (see Figure 3 ).

[0042] The seat can be a thin-walled hollow structure with a bottom open downward, in which a plurality of reinforcing ribs 17 are arranged, and mounting holes are arranged at the intersections of the reinforcing ribs. Nuts are embedded in the mounting holes (or short tubular structures) for threaded connection with the seat's mounting connector or bracket, making assembly and disassembly very convenient.

[0043] The chair back or the integrated seat and chair back may also be a thin-walled hollow structure with an open back surface (the back surface of the chair back, the bottom surface of the seat, etc., the surface facing away from the user) and a plurality of reinforcing ribs disposed therein.

[0044] The reinforcing ribs are usually arranged symmetrically on both sides.

[0045] If necessary, the seat and back of the integrated structure can adopt a hollow structure, with cavities provided in at least part of the area, thereby saving materials while maintaining the apparent thickness and obtaining corresponding strength.

[0046] The chair back may be provided with a plurality of through holes to facilitate ventilation, thereby avoiding excessive discomfort caused by a large area of ​​the chair back being airtight in summer.

[0047] When a through hole is provided on the chair back and passes through the cavity, the through hole can be made into a tubular structure to prevent the cavity from communicating with the external air through the through hole and keep the cavity as a sealed cavity.

[0048] Based on the environmental conditions outdoors, especially in stadium stands, the plastics used to make seats (seats, backs and armrests, etc.) are preferably weather-modified plastics (modifications with the main purpose of improving weather resistance), for example, weather-modified or unmodified PP, ABS, PVC, PUR, etc.

[0049] The plastic can be corresponding ramie reinforced plastic or other fiber reinforced plastic, including various reinforced modified plastics.

[0050] The foldable connection between the armrest and the seat can adopt any suitable existing technology, and a preferred method is to adopt a parallel four-bar linkage.

[0051] For example, two connecting rods 22 are provided between each of the armrests and the side of the corresponding seat, and the two connecting rods on the same side are distributed front and back, and the two ends of each connecting rod are respectively hinged to the armrest and the side of the seat on the corresponding side, in particular, pivoted (the hinges in the following embodiments can all be pivoted), and the armrest, the seat and the two connecting rods on the corresponding side form a parallelogram mechanism. The positions of each hinge point 24, 26 are set according to the requirements of the parallelogram mechanism, so that the sequential connecting lines of the four hinge points in any state form a parallelogram, and the direction of the hinge axis (the rotation axis of the two parts rotating relative to each other) is horizontal (left and right), thereby allowing the armrest to be lifted relative to the seat to its normal position, or put down and folded to the side of the seat to basically form the same plane with the seat, and to ensure that the posture of the armrest (extension direction and inclination angle, etc.) remains unchanged.

[0052] The inclination angle of the armrest can be controlled by appropriately setting the relative heights of the two hinge points between the lower ends of the two connecting rods and the seat, so that the front end of the armrest tilts upward (slightly tilts upward), making the user feel more comfortable.

[0053] The connecting rod is a fixed rod (a rod with a fixed length) or a telescopic rod.

[0054] The telescopic rod can be adjusted to a desired size and fixed according to actual needs, and the length adjustment method of the telescopic rod can be based on the existing technology.

[0055] The hinged connection between the connecting rod and the armrest and the seat can adopt a rotating connection structure with a shaft and a hole, or adopt an articulated connection piece (hinge, or pivot device) with a shaft and a hole.

[0056] For example, for any connecting rod, two upper and lower hinge shafts are respectively arranged on the armrest and the side of the seat, and the upper and lower ends of the connecting rod are respectively provided with hinge through holes for being mounted on the corresponding hinge shafts, and a small gap for rotational cooperation is provided between the hinge through holes and the corresponding hinge shafts, thereby realizing the corresponding articulation.

[0057] Based on the convenience of installation, the hinge shaft can be fixedly connected to the seat or armrest by threaded connection, welding, bonding or other fixed connection methods.

[0058] For example (see Figure 8 ), the lower end of the corresponding connecting rod 22 is placed on the outside of the seat, and the single-head bolt used as the hinge shaft 51 passes through the hinge through hole at the lower end of the corresponding connecting rod. The tail end of the bolt (the end without the head) is fixedly screwed to the side of the corresponding seat. The bolt rod located in the hinge through hole is a bare rod, and a rotational matching clearance is left between the bolt head 52 and the hinge through hole. The outer diameter of the bolt head 52 is larger than the aperture of the corresponding hinge through hole, blocking the axial movement of the connecting rod from the outside, thereby realizing the hinge between the connecting rod and the seat. The tightening degree of the bolt can be appropriately selected to ensure the normal movement of the connecting rod while avoiding axial shaking. An expansion diameter (the part of the through hole with a larger aperture than the main body aperture, or called an expansion diameter section, or an expansion diameter hole) 55 can be provided at the outer end of the corresponding hinge through hole on the connecting rod, so that the head of the bolt enters / is hidden in the expansion diameter.

[0059] For example (see Fig. 9 ), place the upper end of the corresponding connecting rod on the inner side of the handrail, and the single-head bolt used as the hinge axis 51 passes through the hinge through hole at the lower end of the corresponding connecting rod. The tail end of the bolt is fixedly screwed to the side of the corresponding handrail. The bolt rod in the hinge through hole is a bare rod, and a rotational fit clearance is left between the bolt head 52 and the hinge through hole. The outer diameter of the bolt head 52 is larger than the aperture of the corresponding hinge through hole, blocking the axial movement of the connecting rod from the inside, thereby realizing the hinge between the connecting rod and the handrail. The tightening degree of the bolt can be appropriately selected to avoid axial shaking while ensuring the normal movement of the connecting rod. An expansion diameter 52 can be provided at the inner end of the corresponding hinge through hole on the connecting rod, so that the bolt head can enter / be hidden in the expansion diameter.

[0060] For example (see Fig.10 ), a longitudinal (front-to-back direction) hinge groove can be provided on the bottom surface (lower surface) of the armrest, the hinge groove can be provided as a long groove on the entire length of the armrest, or a short groove only located at the hinged position, the upper end of the corresponding connecting rod extends into the shaft mounting groove, one end of the hinge shaft 51 is a threaded end with an external thread, and the other end is an operating end, and a structure (for example, a cross slot structure, or a hexagonal hole structure) that cooperates with a rotating tool (screwdriver, hexagonal wrench, etc.) is provided on the end surface, a smooth through hole is provided on one side of the hinge groove wall, and a screw hole (preferably a threaded blind hole, opening in the groove) is provided on the other side of the groove wall, the threaded end of the hinge shaft is inserted from the smooth through hole, passes through the hinge through hole located at the upper end of the connecting rod, and is fixedly screwed on the corresponding screw hole, a rotational matching gap is left between the hinge through hole and the hinge shaft, thereby realizing the hinge between the connecting rod and the armrest.

[0061] An adhesive can be provided between the screw holes on the side of the seat and the side of the armrest that match the bolts and the ends of the bolts screwed onto the screw holes. After the adhesive is cured, the bolts are fixed, which helps to prevent the bolts from loosening or falling off due to vibration during long-term use.

[0062] The threaded fixed connection between the hinge shaft and the seat or armrest can be replaced by bonding, welding, interference fit or other suitable fixed connection methods, or a combination of multiple fixed connection methods can be used.

[0063] When the upper end of the connecting rod is arranged on the inner side of the handrail, a notch structure can be arranged on the lower part of the inner side of the handrail (see Fig. 9 ), or in other words, the inner side surface of the handrail is in a concave stepped shape, the upper end of the corresponding connecting rod is placed at the lower part of the inner side surface of the handrail, and the inner side surface of the connecting rod is slightly concave than the inner side surface of the handrail or is flush with the inner side surface of the handrail.

[0064] The seat and backrest of the integrated structure may be provided with a first limiting structure for limiting the raised position of the armrest and a second limiting structure for limiting the folded position of the armrest. The first limiting structure may adopt a protrusion 25 located on the side of the seat, which is used as the protrusion of the first limiting structure to block in the rear direction of the corresponding connecting rod (when the armrest is raised into place), preventing the connecting rod from further rotating in the armrest raising direction after the armrest is raised into place. The second limiting structure may adopt a protrusion 29 on the side of the seat, which is used as the protrusion of the second limiting structure to block in the lower direction of the corresponding connecting rod (when the armrest is folded into place), preventing the connecting rod from further rotating in the armrest folding direction after the armrest is folded into place, thereby limiting the position of the armrest in the raised or folded state.

[0065] The inner side surface of the rear portion of the armrest may be provided with a first elastic positioning pin 21 (see Figure 4 ), the side of the seat is provided with a pit structure (for example, a spherical crown concave structure smaller than or not larger than a hemisphere) that matches the elastic positioning pin. When the armrest is lifted into place, the pin head of the first elastic positioning pin is aligned with the corresponding pit structure. The pin head is inserted into the corresponding first pit structure under the action of the spring to prevent the armrest from moving. When the folding external force on the armrest reaches a certain level, the pin head compresses the spring of the first elastic positioning pin under the action of the first pit structure, so that the armrest can move, thereby realizing the elastic positioning of the armrest. The user can also know that the armrest is in place based on the sound of the pin head colliding with the pit structure.

[0066] A second elastic locating pin (not shown) may be provided on the inner side surface of the front portion of the armrest, and a second pit structure (for example, a spherical crown-shaped concave structure smaller than or not larger than a hemisphere) matching the second elastic locating pin may be provided on the side surface of the seat. When the armrest is lifted into place, the pin head of the second elastic locating pin is aligned with the corresponding pit structure, and the pin head is inserted into the corresponding pit structure under the action of the spring to prevent the armrest from moving. When the lifting external force applied to the armrest reaches a certain level, the pin head compresses the spring of the second elastic locating pin under the action of the second pit structure to allow the armrest to move, thereby achieving elastic positioning of the armrest in a folded state. The user can also know that the armrest is in place based on the sound of the pin head colliding with the pit structure.

[0067] Other positioning methods or positioning structures can also be used. For example (see Figure 5 ), in order to realize the positioning of the armrest in the lifted state, a rotatable bolt rod 28 can be provided at the rear end of the armrest, one end of the bolt rod is hinged to the rear end of the armrest, and the direction of the hinge axis is the extension direction of the rear part of the armrest or the direction perpendicular to the rear end surface of the armrest. When the armrest is lifted into place, the rear end of the armrest is aligned with the rear surface of the chair back. The bolt rod is rotated to block the back of the chair back to prevent the armrest from moving in the folding direction, thereby cooperating with the first positioning structure to fix the position of the armrest. When the armrest needs to be folded, the bolt rod is rotated to leave the back of the chair back, thereby allowing the armrest to move in the folding direction.

[0068] The chair back is provided with a human body sensor 19, for example, a human body pyroelectric infrared sensor, for detecting whether there is a person on the seat, and its detection distance can generally be about 20 cm, so as to ensure that the person sitting on the seat can be reliably detected and no false alarm will be caused by someone passing by the seat. The detection distance and setting method can be set according to the performance of the sensor and the specific conditions such as the size of the seat.

[0069] The seat and back of the integrated structure are provided with a number coating for displaying the seat number (eg, zone, row, seat number). The number coating is a fluorescent (luminous) coating containing fluorescent powder (luminous powder).

[0070] This type of outdoor self-cleaning seat can be used as a seat (seat unit) in a row of seats in a grandstand. The seat is fixedly mounted on the grandstand 40 and is divided into multiple rows. The seats in each row are alternately distributed front to back. In adjacent rows of seats, the installation height of the rear seats is not lower than that of the front seats and the installation height of at least some of the rear seats is higher than (or not lower than) that of the front seats. Usually, the installation height of the row of seats increases row by row from front to back.

[0071] The stands 40 are in a stepped shape, with each step corresponding to one or more rows of seats, preferably one row. For areas close to the sports field, multiple rows may also be arranged on the same step.

[0072] A support rod 32 extending forward is fixedly provided on the stepped facade of the stand, and the seats are fixedly mounted on the support rod through mounting connectors, and are located above the corresponding stepped plane (including the ground for the first row) in a suspended state.

[0073] The support rods may be embedded in advance when the stands are constructed, with a portion of the support rods embedded in advance and fixed in the concrete constituting the stands, and the support rods fixed in the concrete are preferably connected to the structural steel bars in the stands (for example, by welding, or by tying them together and then fixing them together by pouring concrete).

[0074] The support rod can be made of any suitable profile such as angle steel, channel steel or square steel, and the surface can be treated with anti-corrosion if necessary.

[0075] When appropriate, the support rod can be made of a polymer material with sufficient strength.

[0076] The support rod can be an elastic rod with a certain elasticity to allow the seat to have a small amount of movement and improve the comfort of the user. The size of the elastic force can be set according to actual needs and should not be too large.

[0077] The mounting connector is a column 34, the bottom of which is fixed (for example, welded, or bolted) to the front of the support rod, and the top of which is fixedly connected to the bottom surface of the seat.

[0078] The top of the column may be provided with a plurality of (eg, 4) supporting strips 35 (see Figure 7 ), the support strips are distributed at equal angular distances in the circumferential direction, the inner ends are fixedly connected to the top ends of the upright posts, and the outer ends are fixedly connected to the bottom surface of the seat. This not only expands the direct action area with the seat, avoiding damage to the seat or the connection between the seat and the mounting connector due to concentrated force, but also allows the fastening bolts to avoid the shielding area of ​​the support rod, facilitating construction operations.

[0079] The support rod and the column can be made of pipes (square tubes or round tubes, etc.) and are provided with pipe holes. The pipe holes of the support rod and the column are connected, so that wiring can be carried out through these pipe holes. When necessary (for example, when a human body sensor is provided and the human body sensor is provided with a signal output cable), the corresponding part of the wire threading tube can be set in the pipe holes of the support rod and the column, thereby making the wiring neater.

[0080] The bottom surface of the seat can be pre-embedded with mounting nuts, and the outer ends of the supporting strips are provided with through holes 36, which are fastened to the bottom surface of the seat by bolts passing through the corresponding through holes and screwed onto the corresponding mounting nuts.

[0081] The bottom surface of the seat may be provided with a short tubular structure extending downward, and the nut is fixed to the tube hole of the corresponding short tubular structure.

[0082] The short tubular structure is located at the intersection of the reinforcing ribs, and the distribution of the reinforcing ribs can be appropriately set so that each short tubular structure is connected to at least two reinforcing ribs in different directions, so as to improve the service life.

[0083] For example, the bottom surface of the seat may be provided with a plurality of radial reinforcing ribs (not shown) extending from the radial edge of the force center (the force center of the bottom surface of the seat), and one or more circular reinforcing ribs (not shown) with the force center as the center of the circle, the radial reinforcing ribs intersect with the circular reinforcing ribs, and at least part of the intersections of the radial reinforcing ribs and the circular reinforcing ribs are located at the positions of the mounting nuts or short tubular structures. Thus, the column is supported just below the force center of the seat, which is beneficial to the stability of the seat and the extension of its service life.

[0084] The so-called force center is the point of action of the gravity (resultant force) of a person sitting on the seat under normal circumstances, or in other words, the intersection of the line of action of gravity and the bottom surface of the seat, which can be determined / set when designing the seat based on experimental data or experience.

[0085] Unless otherwise specified or one preferred or optional technical means is a further limitation of another technical means, all preferred and optional technical means disclosed in the present utility model can be arbitrarily combined to form several different technical solutions.

Claims

1. An outdoor self-cleaning chair, comprising a seat and a back connected to each other, wherein the back is located at the rear of the seat, characterized in that The surfaces of the seat and the backrest are both provided with a self-cleaning coating, and the self-cleaning coating at least covers the upper surface of the seat and the front surface of the backrest.

2. The outdoor self-cleaning seat according to claim 1, characterized in that There are two armrests installed on both sides of the seat, fixedly connected or foldably connected to the seat, and the surface of the armrest is provided with a self-cleaning coating, which at least covers the upper surface of the armrest.

3. The outdoor self-cleaning seat according to claim 2, characterized in that The foldable connection between the armrest and the seat is as follows: two connecting rods are provided between the armrest and the corresponding side surfaces of the seat, the two connecting rods are distributed front and back, the two ends of the connecting rods are respectively hinged to the corresponding armrest and seat side surfaces, and the direction of the hinge axis is horizontal.

4. A stadium stand using outdoor self-cleaning seats is provided with a stepped stand, on which a number of seats are fixedly installed, the seats are divided into multiple rows, and each row of seats is arranged alternately front and back. In adjacent rows of seats, the installation height of the rear row of seats is higher than that of the front row of seats, characterized in that The seat is an outdoor self-cleaning seat as described in any one of claims 1-3.

5. The sports field stand using outdoor self-cleaning seats as claimed in claim 4, characterized in that A support rod extending forward is fixedly arranged on the stepped facade of the stand, and the seat is fixedly mounted on the support rod through a mounting connector in a suspended state.

6. The sports field stand using outdoor self-cleaning seats as claimed in claim 5, characterized in that The installation connection piece is a column, the bottom of which is fixed to the front part of the support rod, and the top of which is fixedly connected to the bottom surface of the seat.

7. The sports field stand using outdoor self-cleaning seats as claimed in claim 6, characterized in that A plurality of supporting strips are arranged on the top of the column. The supporting strips are distributed at equal angular distances in the circumferential direction, the inner ends of the supporting strips are fixedly connected to the top ends of the columns, and the outer ends of the supporting strips are fixedly connected to the bottom surface of the seat.

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