Patent Publication Number: US-11648457-B2

Title: Torque strengthening device for land surfboard adapters

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to the field of skateboard accessories, in particular to a torque strengthening device for land surfboard adapters. 
     2. Description of the Relater Art 
     Skateboarding is the originator of extreme sports history, and many extreme sports are extended from skateboarding. Skateboarding evolved from surfing in the late 1950s and early 1960s. Skateboarding is widely sought after and loved by young people because of its simplicity, ease of learning, portability, and low location limitations. Now it has become the “coolest” sport on the planet. 
     Most of the existing adapters for surfboards use a torsion spring to control the stability of the adapter&#39;s rotation. In the course of use, it was found that a torque spring of the adapter has poor stability when rotating, and it is easy to break during the movement, which increases the risk. Therefore, a torque strengthening device for land surfboard adapters that can ensure the stability of the adapter, is not easy to break, and improve the safety is developed. 
     SUMMARY OF THE INVENTION 
     The technical problem to be solved by the invention is to overcome the shortcomings of the above technology and provide a torque strengthening device for land surfboard adapters. 
     A torque strengthening device for land surfboard adapters, comprising an upper connecting plate and a lower connecting plate, wherein a number of tension springs arranged obliquely and distributed circumferentially are connected between the upper connecting plate and the lower connecting plate. 
     Further, the upper connecting plate and the lower connecting plate are provided with the same number of evenly arranged spring connecting blocks on the side facing the tension springs; the number of the tension springs is twice the number of the spring connecting blocks on the upper connecting plate, and each of the spring connecting block is provided with two spring connecting holes; the spring connecting blocks of the upper connecting plate and the spring connecting blocks on the lower connecting plate are alternately arranged; one end of each of the tension spring corresponds to the spring connecting block connected to the upper connecting plate, and the other end thereof corresponds to the spring connecting block connected to the lower connecting plate; a number of positioning pins are both provided on the side of the upper connecting plate and the lower connecting plate away from the tension spring; a number of screw fixing holes are both provided on the upper connecting plate and the lower connecting plate. 
     Further, the number of the spring connecting blocks on both the upper connecting plate and the lower connecting plate is 4, and the number of the tension springs is 8. 
     Further, the number of the positioning pins on the upper connecting plate and the number of the positioning pins on the lower connecting plate are both 2, and the number of the screw fixing holes on the upper connecting plate and the number of the screw fixing holes on the lower connecting plate are both 4. 
     Further, the center position of the upper connecting plate and the center position of the lower connecting plate are both provided with a through hole. 
     The advantages of the invention: the invention has reasonable structure and convenient installation; the setting of multiple tension springs enables the adapter to be more stable, balanced, smooth, and quiet when rotating, which avoids the risk of a single tension spring being easily broken during the movement, prolongs the service life of the adapter, improves the safety of land surfboards, and enhances the user experience effect; the invention can replace tension springs with different diameter to obtain different surfing feelings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a first perspective view of a torque strengthening device for land surfboard adapters according to the invention; 
         FIG.  2    is a second perspective view of a torque strengthening device for land surfboard adapters according to the invention; 
         FIG.  3    is a schematic diagram of a torque strengthening device for land surfboard adapters according to the invention applied to an adapter. 
         FIG.  4    is a schematic diagram of the adapter according to the invention applied to a land surfboard; 
     
    
    
     In the figures,  1  refers to the fixing plate;  2  refers to the rotating plate;  3  refers to the thrust bearing;  5  refers to the bottom bracket screw;  6  refers to the locking nut;  11  refers to the upper connecting plate;  21  refers to the lower connecting plate;  31  refers to the tension spring;  41  refers to the spring connecting block;  51  refers to the spring connecting hole;  61  refers to the screw fixing hole;  71  refers to the through hole;  81  refers to the positioning pin. 
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The invention will be further described in detail hereinafter with reference to the drawings. 
     A torque strengthening device for land surfboard adapters, comprising an upper connecting plate  11  and a lower connecting plate  21 , wherein a number of tension springs  31  arranged obliquely and distributed circumferentially are connected between the upper connecting plate  11  and the lower connecting plate  21 . 
     The upper connecting plate  11  and the lower connecting plate  21  are provided with the same number of evenly arranged spring connecting blocks  41  on the side facing the tension springs  31 ; the number of the tension springs  31  is twice the number of the spring connecting blocks  41  on the upper connecting plate  11 , and each of the spring connecting block  41  is provided with two spring connecting holes  51 ; the spring connecting blocks  41  of the upper connecting plate  11  and the spring connecting blocks  41  on the lower connecting plate  21  are alternately arranged; one end of each of the tension spring  31  corresponds to the spring connecting block  41  connected to the upper connecting plate  11 , and the other end thereof corresponds to the spring connecting block  41  connected to the lower connecting plate  21 ; a number of positioning pins  81  are both provided on the side of the upper connecting plate  11  and the lower connecting plate  21  away from the tension spring  31 ; a number of screw fixing holes  61  are both provided on the upper connecting plate  11  and the lower connecting plate  21 . The number of the spring connecting blocks  41  on both the upper connecting plate  11  and the lower connecting plate  21  is 4, and the number of the tension springs  31  is 8. The number of the positioning pins  81  on the upper connecting plate  11  and the number of the positioning pins  81  on the lower connecting plate  21  are both 2, and the number of the screw fixing holes  61  on the upper connecting plate  11  and the number of the screw fixing holes  61  on the lower connecting plate  21  are both 4. The center position of the upper connecting plate  1  and the center position of the lower connecting plate  21  are both provided with a through hole  71 . 
     When the invention is in specific use, that is, when it replaces the single torsion spring in the existing adapter, the connection of the invention is firstly positioned by the positioning pins  81  on the upper connecting plate  11  and the lower connecting plate  21 , and then fixed by the screw fixing holes  61  and the fixing screws; as shown in  FIG.  3   , the adapter generally comprises a fixing plate  1 , a rotating plate  2 , a thrust bearing  3 , a bottom bracket screw  5 , and a locking nut  6 ; the fixing plate  1  and the rotating plate  2  are connected to the locking nut  6  by the bottom bracket screw  5 , and the bottom bracket screw  5  is located between the fixing plate  1  and the rotating plate  2 . 
       FIG.  4    is a schematic diagram of the adapter according to the invention applied to a land surfboard. 
     The design of the invention is convenient to install, and the adapter is more stable, balanced, smooth, and quiet when rotating. This structure can be used as tension springs with different strengths. Therefore, with the same adapter, users can replace rotating structural parts with different strengths to experience different surfing effects. 
     The invention can replace tension springs with different diameter to obtain different surfing feelings, that is, the spiral radius of the tension spring  41  is different, so the diameter is different, and the surfing feeling is also different. 
     The invention and the embodiments thereof are described hereinabove, and this description is not restrictive. What is shown in the drawings is only one of the embodiments of the invention, and the actual structure is not limited thereto. All in all, structural methods and embodiments similar to the technical solution without deviating from the purpose of the invention made by those of ordinary skill in the art without creative design shall all fall within the protection scope of the invention.