Patent Publication Number: US-11027164-B2

Title: Easy-to-assemble trampoline

Description:
TECHNICAL FIELD 
     The invention relates to a trampoline for sporting and/or recreational use, in particular, to an easy-to-assemble trampoline. 
     BACKGROUND 
     At present, the main trampoline producers in the world are mainly concentrated in China, the United States, Germany and Japan. 
     The basic structure of the trampoline includes a flexible mat, a frame, multiple flexible rods(having top end and bottom end), multiple supporting legs, a protective net and multiple supporting rods. The top end of the flexible rod is arranged around the flexible mat, and the bottom end of the flexible rod is retained in the frame, so that the flexible mat is set up above the frame. The frame is erected on the ground with the supporting legs. The protective net is arranged at the periphery of the flexible mat and extended above it to form a closed or semi-closed bouncing space. The protective net protects the users who move on the flexible mat from falling off it. The supporting rods are arranged around the flexible mat to support and open the protective net. 
     Trampoline exercise is a healthy and interesting entertainment. Studies have shown that trampoline exercise can not only exercise the body and strengthen muscle, but also help people develop a sense of balance and improve sports skills. With the development of technology, trampoline is entering people&#39;s life more and more. At the same time, the defects of traditional trampoline are also exposed, such as: 
     1. The bending stiffness of the flexible rod of the traditional trampoline is 1200 N/m-3000 N/m. It takes a lot of effort to install the flexible rod, so it is difficult for the general public to install it. 
     The installation structure of the top end and bottom end of the flexible rod is complex, which can not play an essential auxiliary role in the installation of the flexible rod. 
     After the installation of trampoline, the elasticity of flexible mat can not be adjusted, which can not meet the needs of different user. 
     The trampoline structure is not strong enough, it is easy to collapse and damage. 
     Therefore, it is urgent to improve the structure of trampoline in order to overcome the defects of the prior art. 
     SUMMARY 
     In order to overcome the shortcomings of the prior art, the present invention provides an easy-to-assemble trampoline, the installation structure of flexible rod is improved, so that the installation of trampoline is labor-saving and convenient, and the general public can install it by themselves. After the installation of trampoline, the elastic force of flexible mat can be adjusted to meet the needs of different people and increase the bouncing comfort. The safety of trampoline is greatly improved. 
     The technical proposals of the present invention are as follows: 
     An easy-to-assemble trampoline includes a flexible mat, a frame and a plurality of resiliently flexible rods, its top ends of the flexible rods are arranged at its periphery or at its bottom of the flexible mat, and bottom ends of the flexible rods are retained on the frame, so that the flexible mat is set up above the frame. 
     The top ends of the flexible rods are fixedly mounted at its periphery or bottom of the flexible mat by a buckle structure; the buckle structure includes a an mounting member, a flexible belt and at least one clamping member; one end of the belt is fixed on the flexible mat, the clamping member is fixed on the belt, and the mounting member is provided with a through hole; the belt can pass through the through hole, and the clamping member holds the belt at its outlet of the through hole so that the belt can not be pulled back from the through hole; therefore the top end of the flexible rod is fixedly contained in the mounting member. 
     The bottom of the mounting member is provided with an receiving groove, and the top end of the flexible rod is fixedly contained in the receiving groove. 
     The mounting member has a pipe part and an expanded head arranged at the top of the pipe part; the top of the flexible rod is inserted into and fixed with the pipe part; and the head is provided with the through hole. 
     The clamping member has a short edge and a long edge, its length of the short edge is less than its width of the through hole, and its length of the long edge is larger than its width of the through hole, so that the clamping member can pass through the through hole and be stuck at its outlet of the through hole along its long edge. 
     The flexible rod is a straight bar with a bending stiffness of 3000 N/m˜10000 N/m, the top end of the flexible rod is deflected 10-290 mm from the natural straightening state to the center of the flexible mat, so that the flexible rod is bent and installed at its periphery or at its bottom of the flexible mat to support and tension the flexible mat. 
     Its diameter of the flexible rod is 0.5-3 cm, and its length of the flexible rod is 0.3-1.5 m. 
     The flexible rod is made from alloy aluminum. 
     The flexible pad has a length or width of 120 feet. 
     Its bottom end of the flexible rod is fixed and retained in the frame through an installation structure. 
     The installation structure includes a pair of upper inserting hole on the upper side of the frame and a lower inserting hole on the lower side of the frame, each pair of the upper inserting hole and the lower inserting hole are staggered settings; the flexible rod is inserted into a pair of the upper inserting hole and the lower inserting hole. 
     The installation structure also has a first sleeve corresponding to each pair of the upper inserting hole and the lower inserting hole, the first sleeve is inserted into a pair of the upper inserting hole and the lower inserting hole, and the bottom end of the flexible rod is inserted into the first sleeve. 
     Its hole diameter of the lower inserting hole is larger than the diameter of the bottom end of the first sleeve and less than the diameter of the main body of the first sleeve, thereby preventing the first sleeve from falling off the lower inserting hole. 
     The installation structure also has an elastic part, the elastic part is inserted between the upper inserting hole and the flexible rod, thereby adjusting the position of the flexible rod in the frame. 
     The upper inserting hole is arranged as an elliptical hole, and its two ends of the elliptical hole, named as A end and B end, respectively, are located on inside and outside of the upper side of the frame respectively; the elastic part is inserted into the A end or the B end, thereby adjusting the position of the flexible rod. 
     The frame is a circle connected at the beginnings and tails of several arc-shaped steel pipes, a joint of the adjacent arc-shaped steel pipes is respectively provided with a first socket tube and a first insert joint which are matched; the socket tube is inserted into the first insert joint and is fixedly connected therein through a nail pin. 
     The trampoline also includes a plurality of supporting structures, which are supported below the frame; each of the supporting structures is provided with a horizontal rod, a first vertical rod and a second vertical rod which are arranged at two ends of the horizontal rod, and a third vertical rod arranged in the middle of the horizontal rod; the first vertical rod and the second vertical rod are respectively inclined in the central direction of the flexible mat, and the top of the first vertical rod and top of the second vertical rod are reversely bent, the frame is provided with a matching cylinder matched with the top of the first vertical rod and the top of the second vertical rod. 
     The frame is provided with a second plug-in cylinder second socket, and the top of the third vertical rod is inserted into the second socket. 
     The trampoline also includes several supporting rods evenly distributed around the flexible mat; the first vertical rod is welded with a second sleeve, and its bottom end of each of the supporting rods is inserted into the second sleeve; its outlet of the second sleeve is flat, and the shape and size of its bottom end of each of the supporting rods is matched with its outlet of the second sleeve; the bottom of the second sleeve is arranged as a cylinder, and its diameter of the cylinder is slightly smaller than the diameter of its outlet. 
     The supporting rod is a large arc-shaped rod joined by two small arc steel pipe; the joint of the two small arc-shaped steel pipe is also provided with a matching plug-in cylinder and a plug-in connector respectively, and the plug-in connector is inserted into the plug-in cylinder, and the two are fixed and connected by a nail pin. 
     The trampoline also includes a protective net, its bottom of the protective net is arranged around the flexible mat and extends upward, its top of the protective net is supported by a plurality of supporting rods disposed around the flexible mat, forming a closed or unclosed space for bouncing. 
     Its top of the supporting rod is provided with a hole, its upper end of the protective net is provided with a plurality of upper hooks, and the hook is inserted into the hole; the buckle structure is provided with lower hooks; and the lower hooks hook the lower end of the protective net. 
     The buckle structure is provided with a mounting member, the mounting member has a pipe part and an enlarged head part arranged at the top end of the pipe part, the lower hook is arranged on the pipe part, and the lower hook is arranged toward the center of the flexible mat. 
     Its top of the protective net is also provided with a basketball frame; the basketball frame is fixed on one of the supporting rods; the protective net is provided with a zipper door; and the frame is also provided with a ladder. 
     Its bottom of the protective net is connected with the periphery or bottom of the flexible mat by zipper. 
     The beneficial effects of the invention are as follows: the buckle structure connects the flexible rod and the flexible pad, the installation of trampoline can be easily realized, the installation safety can be improved, and the elasticity of the trampoline can be adjusted. 
     The mounting structure includes the first sleeve, the first sleeve is inserted into the frame and used for receiving the bottom end of the flexible rod, so as to facilitate the installation of the flexible rod, and the frame structure is simplified and the production is convenient. An elastic member is also arranged in the frame, which adjusts the position of the flexible rod inserted into the frame, thereby adjusting the tension and elasticity of the flexible pad to meet the needs of different users and improve the bounce comfort of the flexible pad. 
     The supporting structure increases the stability of the trampoline and improves the safety performance of the trampoline. 
     The bending stiffness of the flexible rod is 3000 N/m−10000 N/m. Although the bending stiffness is high, when installing, it only needs to deflect 10-200 mm to the center of the flexible pad. The installation is labor-saving. Ordinary consumers can install it themselves, it reduces the difficulty of trampoline installation and improves the safety of the installation. The bending stiffness of the flexible rod is 3000 N/m−10000 N/m, which is not easy to fatigue and has good elastic recovery ability. It can keep the flexible pad in the tension state and increase the balance performance of the trampoline. 
     By setting the upper hook and the lower hook to hook the upper part and lower part of the protective net respectively, the protective net is fixed and supported around the flexible pad and enclosed into a closed or unclosed space, which makes the installation and disassembly of the protective net very convenient. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of the trampoline in the present invention. 
         FIG. 2  is a perspective view of the flexible rod  30  in the present invention. 
         FIG. 3  is a perspective view of the installation structure of the trampoline in the present invention. 
         FIG. 4  is a decomposition view of the installation structure of the trampoline in the present invention. 
         FIG. 5  is a perspective view of the first sleeve in the present invention. 
         FIG. 6  is perspective view of the arc-shaped steel pipe  21  in the present invention. 
         FIG. 7  is a perspective view of the elastic member  27  in the present invention. 
         FIG. 8  is another perspective view of the trampoline in the present invention. 
         FIG. 9  is a perspective view of the buckle structure in the present invention. 
         FIG. 10  is an enlarged view of the A of  FIG. 8 , which shows another perspective view of the buckle structure in the present invention. 
         FIG. 11  is a perspective view of the flexible rod is used in conjunction with the buckle structure and the first sleeve. 
         FIG. 12  is another perspective view of the trampoline in the present invention. 
         FIG. 13  is another perspective view of the buckle structure in the present invention. 
         FIG. 14  is a decomposition view of the trampoline in the present invention. 
         FIG. 15  is a perspective view of the leg structure  40  and the supporting rod  60  of the trampoline in the present invention. 
         FIG. 16  is a perspective view of the second sleeve in the present invention. 
         FIG. 17  is another perspective view of the buckle structure in the present invention. 
         FIG. 18  is a decomposition view used in conjunction with the top of the supporting rod in the present invention. 
         FIG. 19  is a further perspective view of the trampoline in the present invention. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     The followings will further descript the present invention with the embodiments, which are the preferable embodiments in the present invention. 
     Referring to  FIG. 1 , the popular trampoline usually includes a flexible mat  10  and a frame  20 , and a plurarty of resiliently flexible rod  30  with top end and bottom, end. Its top end  31  of the flexible rod  30  is installed at its periphery or at its bottom of the flexible mat  10 , and its bottom end of the flexible rod  30  is retained in the frame  20  so that the flexible mat  10  is set up above the frame  20 . At the pressure of the flexible mat  10 , the flexible rod  30  is generally bent and tensioned the flexible mat  10 . The user is able to bounce, play, and perform on the flexible mat  10 . The flexible rod  30  is preferably made from alloy aluminum, glass fiber, or carbon fiber. 
     The flexible mat  10  is preferably round, or it may be any other shape, such as a square, a pentagonal, a hexagonal, an oval, etc. The frame  20  is a circle connected at the beginnings and tails of several arc-shaped steel pipes  21 , the joint of the adjacent arc-shaped steel pipes  21  is respectively provided with a first plug-in cylinder and a first plug-in connector which are matched; the first plug-in connector is inserted into the first plug-in cylinder and is fixedly connected therein through a nail pin. 
     The frame  20  may also be placed on the ground, it is preferably placed on the supporting legs  40 . 
     In order to support the flexible pad  10  and the user, the flexible rod  30  generally needs to have a certain bending force. When the flexible rod  30  is installed, its bottom end of the flexible rod  30  is usually fixed in the frame  20 , and then its top end of the flexible rod  30  is deflected from the natural straightening state toward the center of the flexible pad  10 , so that the flexible rod  30  supports and tentioned the flexible pad  10  to meet the elasticity required to bounce. 
     In the prior art, the bending stiffness of the flexible rod  30  is generally less than 3000 N/m. This requires that its top end of the flexible rod  30 , which has not been connected to the edge of the flexible mat  10 , deflect 300-450 mm from the natural straightening state to the center of the flexible mat  30  in order to support the flexible mat  30  and make the elasticity of the flexible mat  30  meet the requirements of the trampoline. The bending stiffness of flexible rod  30  in the prior art is too low, resulting in poor elastic recovery ability and easy bending. After the trampoline is used for a period of time, the flexible rod  30  cannot be restored to the original position so that the flexible mat  10  no longer maintains the tentioned state, the structure is relaxed, and the elasticity decreases. In addition, when the bending stiffness of the flexible rod  30  is less than 3000 N/m, the maximum size of the flexible mat  10  can only be 13 feet. Otherwise, the elasticity of the flexible mat  10  cannot meet the requirements. 
     The applicant has found that the bending stiffness of the flexible rod  30  can overcome the above-mentioned defects when the flexible rod  30  is a straight rod with bending rigidity of 3000 N/m−10000 N/m, the bottom end of the flexible rod  30  is retained in the frame, and the top end of the flexible rod deflects 10-200 mm from the natural straightening state to the center of the flexible mat, so that the flexible rod is bent and installed at the periphery or at the bottom of the flexible mat  10  to support and tighten the flexible mat  10 . When the bending stiffness of the flexible rod is 3000 N/m˜10000 N/m, the elastic restoring force of the flexible rod increases and is not easy to fatigue and deform. Although the bending stiffness of the flexible rod increases, the distance of deflection towards the center of the flexible mat is reduced, which makes the installation of the flexible rod easier. 
     At present, the material of the flexible rod in the market is glass fiber or carbon. The glass fiber has good corrosion resistance, insulating property, heat-insulating property and high strength etc. However, the hardness of the glass fiber is high, combined with its inherent brittleness, the glass fiber has the defects of not bending resistance, poor abrasion resistance, poor flexibility and the like, the long-term repeated use of the glass fiber rod and the use of the glass fiber rod in the low-temperature state are easy to crack, the original elasticity is lost, Sometimes it breaks, causing trampoline damage, and there are safety risks. In addition, according to the list of carcinogens in the list of carcinogens published by the World Health Organization International Cancer Research Agency on 27 Oct. 2017, it is an unsafe material. 
     Preferably, the material of the flexible rod  30  according to the present invention is an aluminum alloy rod. Aluminum alloy is light in material, the surface is oxidized, wind resistance and compressive capacity are stronger than that of fiberglass, and it also has good strength, toughness, fatigue resistance and plasticity, not easy to break. Even if the pressure exceeds its upper limit, the aluminum alloy rod does not break, but increases the curvature. It will not cause trampoline damage and improve the safety of trampoline. 
     Preferably, the diameter of the flexible rod is 0.5-3.0 cm. 
     Preferably, the length of the flexible rod is 0.3-1.5 m. 
     When the stiffness of the flexible rod is 3000 N/m˜10000 N/m, the diameter of the flexible mat is 11-20 feet. 
     Referring to  FIG. 2 , its bottom end of the flexible rod  30  is fixed and retained in the frame  20  through an installation structure. The installation structure includes an upper inserting hole  24  provided on an upper side of the frame  20  and a lower inserting hole  25  provided at a lower side of the frame  20 . And each pair of the upper inserting hole  24  and the lower inserting hole  25  is disposed in a staggered manner. The bottom end  31  of the flexible rod  30  is inserted obliquely into the upper inserting hole  24  and the lower inserting hole  25 . 
     The installation structure also includes a first sleeve  26  corresponding to each pair of the upper inserting hole  24  and the lower inserting hole  25 . The first sleeve  26  is inserted into the upper inserting hole  24  and the lower inserting hole  25 . The bottom end of the flexible rod  30  is inserted into the first sleeve  26 . 
     Referring to  FIGS. 3-5 , in order to prevent the first sleeve  26  from falling off from the lower inserting hole  25 , its diameter of the bottom end  262  of the first sleeve  26  is less than its diameter of its main part  261  of the first sleeve  26 . In particular, the aperture of the lower inserting hole  25  is larger than the diameter of the bottom end  262  and smaller than the diameter of the main body  261 , thereby preventing the first sleeve  26  from falling off the lower inserting hole  25 . 
     Further, its top  263  of the first sleeve  26  is provided with a gradually broaden outlet in the direction so as to facilitate the insertion of the bottom end of the flexible rod  30 . 
     When the bottom end  32  of the flexible rod  30  is installed, the first sleeve  26  is first inserted into a pair of upper inserting hole  24  and the lower inserting hole  25 , and then the bottom end  32  of the flexible rod  30  is inserted directly into the first sleeve  26 . Or the bottom end  32  of the flexible rod  30  can be inserted directly into the first sleeve  26 , and then the two are inserted into a pair of upper inserting hole  24  and the lower inserting hole  25  at the same time, and the installation is simple and convenient. 
     It should be understood that when the bottom end of the flexible rod  30  and the first sleeve  26  are inserted into the lower inserting hole  25 , the bottom end of the flexible rod  30  is fixed in the frame  20 . When the top end of the flexible rod  30  is installed around the flexible mat  10 , the installing position of the top end of the flexible rod  30  remains unchanged, and the tension and elasticity of the flexible mat  10  are constant. 
     Referring to  FIG. 3 ,  FIG. 5  and  FIG. 7 , an elastic member  27  is also provided at the upper inserting hole  24 . The elastic member  27  is inserted between its hole wall of the upper inserting hole  24  and the flexible rod  30  to adjust the position of the flexible rod  30 . Preferably, the upper inserting hole  24  is arranged as an elliptical hole, and the two ends of the elliptical hole are recorded as the A position and the B position, respectively, located on the inside and outside of the upper side of the frame  20 . The elastic member  27  is inserted into the A position or the B position, so that the position of the flexible rod  30  in the frame  20  is adjusted, and the tension and the elastic force of the elastic member  27  are adjusted. Concretely, when the bottom end of the flexible rod  30  and the first sleeve  26  pass through the upper inserting hole  24  and insert the lower inserting hole  25 . The elastic member  27  is inserted into the A position, that is, the upper inserting hole  24  is close to the inner side of the upper side of the frame  20 , and the flexible rod  30  and the first sleeve  26  are extruded to a B position. At this time, the flexible rod  30  has a greater tensile force on the flexible mat  10  and the elastic flexible mat  30  has higher elasticity. When the elastic member  27  is inserted into the B position, that is, the upper inserting hole  24  is close to the outside of the frame  20 , the flexible rod  30  and the sleeve  26  are squeezed to the A position. The tension of the flexible mat  10  is smaller, and the elasticity of the flexible mat  10  is reducer. 
     Preferably, referring to  FIG. 6 , its middle position of the hole wall of the upper hole  24  is symmetrically dug with two limiting grooves  28 . Referring to  FIG. 6 , its side of the elastic member  27  close to the first sleeve  26  is the inner side, its side of the elastic member  27  close to the hole wall is the outer side  272 , the inner side  271  and the outer side  272  are arranged as arc surfaces, and the intersection of the two arc surfaces is provided with clamping block  273 , the clamping block  273  and the limit groove  28  are match each other and can hold each other. 
     Preferably, the intersection of the clamping block  273  and the outer side  272  is provided with an upper convex part  270 . Its bottom of the outer side  272  of the elastic member  27  is provided with a lower convex part  275 . The elastic member  27  is inserted into the upper inserting hole  24 , and the upper convex part  274  and the lower convex part  275  are respectively holds the periphery of the hole wall of the upper inserting hole  24  from the upper direction and the lower direction, thereby preventing it falling off from the upper inserting hole  24 . 
     Preferably, referring to  FIG. 1 ,  FIG. 8  and  FIG. 12 , in order to facilitate the installation of the top end of the flexible rod  30 , a plurality of buckle structures  70  are arranged at its periphery or at its bottom of the flexible mat  10 , the buckle structures  70  corresponds to the flexible rods  30 , and the top end  31  of the flexible rod  30  is detachably installed in a predetermined position at its periphery or at its bottom of the flexible mat  10  in a labor-saving and convenient manner. Referring to  FIG. 3 , the buckle structure includes a mounting member  71 , a flexible belt  72  and at least one clamping member  73 . One end of the belt  72  is fixed on its bottom of the flexible mat  10 , the clamping member  73  is fixed on the belt  72 , and the mounting member  71  is provided with a through hole  713 ; the belt  72  can pass through the through hole  713 , and the clamping member  72  holds the belt  72  at its outlet of the through hole  713  so that the belt  72  can not be pulled back from the through hole  713 ; therefore the top end of the flexible rod  30  is fixedly contained in the mounting member  71 . 
     Preferably, referring to  FIG. 10 , in one embodiment of the present invention, the bottom of the mounting member  71  is provided with a receiving groove(not shown)in which the top  31  of the flexible rod  30  is fixedly disposed. Preferably, the receiving groove is arranged in an extension direction of the top end  31  of the flexible rod  30  so as to facilitate the insertion of the top  31  of the flexible rod  30 . In the embodiment shown in  FIG. 10 , the mounting member  71  is similar to a cubic shape. It should be understood that the shape of the mounting member  71  is not limited to the shape shown in  FIG. 3 , but it may also be spherical, polyhedral or any other shape. The present invention is not specifically limited to the shape of the mounting member  71 , and any change in the external shape of the mounting member  71 , without departing from the basic concept of the present invention, should be regarded in the scope of protection as defined in the present invention. 
     Preferably, referring to  FIG. 10 ,  FIG. 11  and  FIG. 12 , the mounting member  71  has a pipe part  711  and an expanded head  712  arranged at the top of the pipe part  711 . The top end  31  of the flexible rod  30  is inserted into and fixed with the pipe part  711 . The pipe part  711  is arranged in an extension direction of the top end  31  of the flexible rod  30  so as to facilitate the insertion of the top end  31  of the flexible rod  30 . The side of the expanded head  712  is provided with the through hole  713 . 
     Referring to  FIG. 10 , the diameter of the expanded head  712  is larger than that of the pipe part  711 , thereby increasing the contact area between the mounting member  71  and the flexible mat  10 , and more firmly supporting the flexible mat  10 . 
     Preferably, a baffle  714  is protruded at the expanded head  712  at the outlet of the through hole  723 . The baffle  714  is able to resist the clamping member  73 , thereby preventing the clamping member  73  from sliding and retracting the through hole  723 . 
     Concretely, referring to  FIG. 10 , the expanded head  712  is similar to a cuboid shape, its bottom side of the expanded head  712  is integrated into the pipe part  711 , the expanded head  712  is arranged with a small end and a large end along the direction of the through hole  713 . The through hole  713  is arranged in a flat hole. 
     Preferably, the clamping member  73  is capable of passing through one side of the through-hole  713  and is fixed on the other side of the through-hole  713 . In one of the embodiment of the invention, the clamping member  73  has a smaller short edge and a longer long edge. The short edge of the clamping member  73  is slightly smaller than the width of the through hole  713 , and the long edge of the clamping member  73  is slightly larger than the width of the through hole  713 . Such a configuration enables the clamping member  73  to pass through from one side of the through hole  713  to the other side, turn the card member  73  after passing through it, and hold it at the outlet of the through hole  713 . 
     It is to be understood that the clamping member  73  matches the shape of the through hole  713 . For example, when the clamping member  73  is a long cylinder, the through hole  713  should also be a long cylinder; when the clamping member  73  is a long cube shape, the through hole  713  must also be a long cubic shape accordingly. Referring to  FIG. 9 ,  FIG. 10  and  FIG. 13 , in one of the embodiment of the invention, the clamping member  73  is provided as a thin metal piece. The through hole  713  is also arranged as a flat mouth. Preferably, the clamping member  73  of the invention is designed as a thin piece. The through hole  713  is designed as a flat hole. Preferred, the end of the clamping member  73  is provided with a hook. 
     After the clamping member  73  passes through the through hole  713 , the clamping member  73  is stuck at the other side of the hole  713 , thereby realizing the fixing of the belt  72  and preventing the belt  72  from being retracted under the action of pulling force, thereby fixing the top of the flexible rod  30  at its periphery or at its bottom of the flexible mat  10 . 
     It should be understood that the position of the clamping member  73  on the belt  72  must meet the design purpose of “installing the top of the flexible rod  30  at its periphery or at its bottom of the flexible mat  10 ”. Therefore, the clamping member  73  shall be installed on the belt  72  in a suitable position. The clamping member  73  is too far or too close to the flexible mat  10  to achieve the design purpose. 
     The belt  72  is fixed on the flexible mat  10 . It should be understood that the flexible belt  72  is fixed at the flexible mat  10  in a variety of ways, for example, by welding, clamping, fastening, etc. In the preferred embodiment of the invention, the belt  72  is sewn at the bottom of the flexible mat  10 . 
     Referring to  FIG. 11 , the mounting member  71  may be arranged directly at the top of the flexible rod  30 . During installation, the bottom end  32  of the flexible rod  30  is first inserted into the first sleeve  26  and the frame  20 , then the belt  72  is passed through the through hole  723 , and the top  31  of the flexible rod  30  and the mounting member  71  are pushed to a predetermined position at its periphery or at its bottom of the flexible mat  10 , the clamping member  73  is pulled out of the through hole  713 , and the clamping member  73  is rotated to hold it at the outlet of the through hole  713 . It is realized that the top  31  of the flexible rod  30  and the head  712  are installed at its periphery or at its bottom of the flexible mat  10 . 
     The mounting member  72  may also be directly installed onto the belt  71 . During the installation, the bottom end  32  of the flexible rod  30  is first inserted into the first sleeve  26  of the frame  20 , the mounting member  72  is adjusted to the proper position of the belt  71 , the top end  31  of the flexible rod  30  is inserted into the mounting groove or the tube part of the mounting member  72 , pushing the top end  31  of the flexible rod  30  and the mounting member  72  to a predetermined position at its periphery or at its bottom of the flexible mat  10 , pulling the clamping member  73  from the through hole  713 , rotating the clamping member  73  to hold it at the through hole  713 , the purpose of installing the top end  31  of the flexible rod  30  and the head  722  at its periphery or at its bottom of the flexible mat  10  is realized. 
     In the trampoline, a number of flexible rods  30  are evenly distributed between the frame  20  and the flexible mat  10 , supporting the flexible mat  10  so that the force of the flexible mat  10  is balanced in all directions. In the process of trampoline installation, if multiple of the flexible rods  30  are installed in sequence on the flexible mat  10 , the side of the flexible mat  10 , where has not installed the flexible rods  30 , will be suffer uneven force, resulting in the difficulty of installing the flexible rod on that side, and even affecting the forming structure of the final product. To resolve this shortcomings, referring to  FIG. 12  and  FIG. 13 , the number of the clamping member  73  on the belt  72  of the present invention is two, and the first clamping member  73  is capable of installing the top end of the flexible rod  30  and the head  722  in a pre-installed position, for example, its periphery of the flexible mat. The second clamping member  73  is capable of installing the top end of the flexible rod  30  and the head  722  in the installing position, for example, the bottom of the flexible mat  10 . During installation, the bottom end of the flexible rod  30  is first fixed to the frame  20 , the belt  72  and the first clamping member  73  pass through the through hole  713  of the head  722 , and the clamping member  73  is hold at the through hole  713  to fix the belt. The top end of the flexible rod  30  and the head are mounted in a pre-installed position, such as its periphery of the flexible mat. When all of the top ends of the flexible rod  30  are installed in a pre-installed position, the belt  72  is pulled sequentially to drive the second clamping member  73  to pass through the through hole  713  and hold at the outlet of the through hole  723 , the flexible rod  30  is further bent, and the top of the flexible rod  30  is mounted in the mounting position, that is, the bottom of the flexible mat  10 . 
     In general, in order to facilitate transportation, the frame  20  is a circle connected at the beginnings and tails of several segments of arc-shaped steel pipe. The joint  25  of the adjacent arc-shaped steel pipe  24  is provided with a first socket tube and a first insert joint (not shown) respectively. The first socket tube is inserted into the first insert joint, and the two are fixed and connected through the nail pin. In the structure of the trampoline, the bottom end of the flexible rod  30  is mounted on the frame  20 , and the top of the flexible rod  30  is supported around the flexible mat  10 . The flexible mat  10  presses the flexible rod  30  down so that it bends in the central direction of the flexible mat  10 . During the installation of the trampoline, when the arc-shaped steel pipe  24  is connected to the flexible mat  10  through a plurality of flexible rods  30 , the flexible rod  30  bends towards the center direction of the flexible mat  10  under the pressure, and the flexible rod  30  pulls the arc-shaped steel pipe  24  upward towards the center direction of the flexible mat  10  so that the middle of each section of the arc-shaped steel pipe  24  is high and the sides of the arc-shaped steel pipe are low, the adjacent arc-shaped steel pipe  24  falls off or collapses from the joint and destroys the stability of the frame  20 . 
     Referring to  FIG. 14  and  FIG. 15 , the trampoline also includes supporting structures  40 , a plurality of which are supported below the frame  20  to remove it from the ground. The supporting structure  20  is provided with a horizontal rod  41 , a first vertical rod  42  and a second vertical rod  43  which are arranged at two ends of the horizontal rod  41 , and a third vertical rod  44  arranged in the middle of the horizontal rod  41 ; the first vertical rod  42  and the second vertical rod  43  are respectively inclined in the central direction of the flexible mat  10 , and the top of the first vertical rod  41  and the second vertical rod  42  are reversely bent. 
     The frame  20  is provided with two matching cylinders  21  matched with its top end  421  of the first vertical rod  41  and its top end  431  of the second vertical rod  42  respectively. The installing direction of the matching cylinders  21  on the frame  20  must be in the extension direction of its top end  421  of the first vertical rod  42  and its top end  431  of the second vertical bar  43 , so that the installation of the leg structure  40  can be easily realized. Further, in order to achieve a stable installation, one of the matching cylinders  21  and the top end  421  are fixed through the nail pin  22 . The other of the matching cylinders  21  and the top end  431  are fixed through the nail pin  22 . 
     After the first vertical rod  42  and the second vertical bar  43  are inserted into the matching cylinders  21 , the first vertical rod  42  and the second vertical bar  43  apply to the arc-shaped steel pipe  24  a force opposite to that applied by the flexible rod  30 , thereby keeping the arc-shaped steel pipe  24  in balance and preventing the arc-shaped steel pipe  24  from being high in the middle and low at both ends. 
     In order to more firmly support the frame  20 , the joint  25  of the adjacent arc-shaped steel pipe  24  is provided with a second socket  23 , which is located in an extension direction at its top end of the third vertical rod  44 . The top end of the third vertical rod  44  is inserted into the second socket  23  to support the joint  25  of the arc-shaped steel pipe  24  to prevent the adjacent arc-shaped steel pipes  24  from falling off or collapsing from the joint  25 . 
     The middle of the horizontal rod  41  is provided with a third insert cylinder  46 , and the bottom end of the third vertical rod  44  is inserted into the third insert cylinder  46 , thereby facilitating the disassembly and installation of the third vertical rod  44 . 
     Referring to  FIG. 14  and  FIG. 15 , the trampoline also includes a number of supporting rods  60  evenly distributed around the flexible mat  10 . The first vertical rod  42  is welded with a second sleeve  45  at its bending position, the installing direction of the cylinder mouth  451  of the second sleeve  45  is located in the extension direction of its bottom end  61  of the supporting rod  60 , and the bottom end  61  of the supporting rod  60  is inserted into the second sleeve  45 . The cylinder mouth  451  of the second sleeve  45  and the bottom end  61  of the supporting rod  60  are match to each other. Preferably, the cylinder mouth  451  of the second sleeve  45  is arranged as a flat mouth. For example, the cylinder mouth  451  of the second sleeve  45  is an elliptical flat mouth, and the bottom end  61  of the supporting rod  60  is also elliptical. The cylinder mouth  451  of the second sleeve  45  is long. The square flat port and the bottom end  61  of the support bar  60  are also rectangular. The flat mouth can prevent the supporting rod  60  from rotating, thereby increasing the stability of the supporting rod  60 . 
     Further, referring to  FIG. 16 , the bottom of the second sleeve  45  is provided as a cylinder  452  having a diameter slightly smaller than the diameter of the cylinder mouth  451 . After the bottom end  61  of the supporting rod  60  is inserted into the cylinder mouth  451 , it is also possible to squeeze into the cylinder  452  under the action of pressure. Since the diameter of the cylinder  452  is slightly smaller than the diameter of the bottom end  61 , the bottom end  61  will be tightly wrapped and the binding force of the two is increased, so that the bottom end  61  cannot be removed from the second sleeve  45 , thereby further increasing the mounting stability of the supporting rod  60 . 
     Preferably, the supporting rod  60  is a large arc-shaped rod joined by two small arc-shaped steel pipe  62 ; the joint of the two small arc-shaped steel pipe  62  is also provided with a matching plug-in cylinder  621  and a plug-in connector  622  respectively, and the plug-in connector  622  is inserted into the plug-in cylinder  621 , and the two are fixed and connected by the nail pin. The two small arc-shaped steel pipe  62  is spliced into a large arc-shaped rod, which is convenient to transport the supporting rod  60 . The two arc-shaped steel pipes are connected by plug-in manner, and with the nail pin  63  fixed connection, which is easy to install. 
     Preferably, the structure of the plug-in cylinder  621  is the same as that of the second sleeve  45 . The structure of the plug-in connector  622  is the same as that of the bottom end  61  of the supporting rod  60 , which is not repeated herein. 
     Referring to  FIG. 17 , the trampoline also includes a protective net  80 , its bottom of the protective net  80  is arranged around the flexible mat  10  and extends upward, its top of the protective net  80  is supported by the supporting rods  60  disposed around the periphery of the flexible mat  10 , forming a closed or unclosed space for bouncing. 
     The lower end of the protective net  80  is fixed and installed around the flexible mat  10  through a plurality of lower mesh hooks  81 , which are hooked through the mesh at the lower end of the protective net  80 . In this way, it is very convenient to install and disassemble the protective net  80 . 
     The lower hook  81  is arranged on the buckle structure  70 , on the frame  20 , or on the installation structure  70 , or on the periphery of the flexible mat  10 . The selection of the position of the lower hook  81  mainly considers the convenience of production and the appearance of the trampoline. Preferably, the lower hook  81  is provided on the pipe part  711  of the buckle structure  70 . This design enables the lower net hook  81  to be produced using the same set of molds as the mounting member  71 , it need not for additional mold and increase the production process, which brings great convenience to the production. 
     It should be understood that the convenience described above can also be obtained by setting the lower hook  81  on the frame  20  and the leg structure  40 . But the drawback of this design is that it will increase the length of the protective net and affect the beauty of the trampoline. 
     Further, the lower hook  81  faces the center position of the flexible mat  10  to prevent it from hovering other objects in use or scratching the user. 
     Their tops of the supporting rods are provided with holes, its upper end of the protective net is provided with a plurality of upper hooks  82 , the top of the support rod  60  is provided with a Jack  65 , and the upper hooks  82  is inserted into the Jack  65  to support the protective net  80 . The design makes the installation and disassembly of the upper part of the protective net  80  convenient. 
     Referring to  FIG. 18 , the upper hook  82  is a “7” glyph, L-shaped, U-shaped, V-shaped, and so on. It should be understood that the shape of the upper hook  82  is not limited to the listed categories. 
     One end of the net hook  82  is fixed and connected to the protective network  82 , the other end is the inserting end  83 , which is inserted into the Jack  65 . The inserting end  83  is arranged as a shrapnel and is flexibly matched with the Jack  65 . 
     The top of the supporting rod  60  is provided with an inserting number, the inserting number has a sphere  67 , the bottom of the sphere  67  extends a fixing member  68 , the fixing member  68  is inserted into the top of the supporting rod  60 , and is fixed to the top of the supporting rod  60  by screw. The Jack  65  is arranged in the sphere  67 . 
     Referring to  FIG. 19 , the top of the protective net  80  is also equipped with a basketball frame  85 . The basketball frame  85  is fixed on one of the support rods  60 . 
     The protective net  80  of the trampoline is provided with a zipper door  84 . The frame  20  is also provided with a ladder  86 . 
     Preferably, the bottom of the protective net  80  is connected by zippers to the perimeter or bottom of the flexible mat  10 . 
     The above is a further detailed description of the invention in combination with a specific preferred embodiment, and it can not be concluded that the specific implementation of the invention is limited to these instructions. For the general technical personnel in the technical field to which the invention belongs, without being separated from the conception of the invention, the architecture form can be flexible and changeable, and a series of products can be derived. If it is just making a number of simple deductions or substitutes should be regarded as falling within the scope of patent protection determined by the claim submitted by the present invention.