Stringer of water sports board with enhanced flexibility and water sports board containing thereof

Abstract

A water sports board having enhanced flexibility includes an elongated core body having a nose end and a tail end, and top and bottom surfaces defining a curved shape of the water sports board; and an elongated planar stringer disposed on a longitudinal centerline of the core body. The elongated planar stringer has a front end and a rear end, two side surfaces, and top and bottom edges curved to a longitudinal profile of the water sports board, and includes multiple slots on the side surfaces disposed between the front and rear ends of the stringer. The flex pattern of the water sports board can be controlled by selecting desired number, size, shape, and location of the slots of the stringer. The water sports board has an increased rocker and enhanced shock dampening property when exposed to the force of water waves.

1 . A water sports board having enhanced flexibility, comprising:
 (a) an elongated core body having a nose end and a tail end, and top and bottom surfaces defining a curved shape of said water sports board; and   (b) an elongated planar stringer having a front end and a rear end, two side surfaces, and top and bottom edges curved to a longitudinal profile of said water sports board, and including multiple slots on said side surfaces disposed between said front and rear ends of said stringer; said planar stringer being disposed on a longitudinal centerline of said core body.   
   
   
       2 . The water sports board of  claim 1 , wherein said elongated core body includes two symmetrical halves, each secured to one of said side surfaces of said planar stringer. 
   
   
       3 . The water sports board of  claim 1 , wherein said multiple slots are openings through the width of said stringer. 
   
   
       4 . The water sports board of  claim 1 , wherein said multiple slots are in a form of recess on said side surfaces partially through the width of said stringer. 
   
   
       5 . The water sports board of  claim 1 , wherein said multiple slots are disposed along a longitudinal axis of said stringer. 
   
   
       6 . The water sports board of  claim 5 , wherein said multiple slots are elongated in a direction of said longitudinal axis. 
   
   
       7 . The water sports board of  claim 6 , wherein said multiple slots have a length from about 2 inches to about 10 inches. 
   
   
       8 . The water sports board of  claim 6 , wherein said multiple slots have a height from about 1/12 to about ½ of the height of said stringer. 
   
   
       9 . The water sports board of  claim 6 , wherein a total length of said multiple slots are from about 15% to about 60% of the length of said stringer. 
   
   
       10 . The water sports board of  claim 6 , wherein said multiple slots have different lengths. 
   
   
       11 . The water sports board of  claim 6 , wherein said multiple slots are aligned sequentially along said longitudinal axis, each of said multiple slots having a predetermined distance from a midpoint of said longitudinal axis of said stringer. 
   
   
       12 . The water sports board of  claim 1 , wherein said stringer is made of at least one material comprising wood, plywood, carbon fiber, para-aramid synthetic fiber, fiberglass, polyvinyl chloride (PVC), rubber, or a combination thereof. 
   
   
       13 . The water sports board of  claim 1 , wherein said stringer has a height substantially same as the height of said core body. 
   
   
       14 . The water sports board of  claim 1 , wherein said core body comprises an outer shell adhering to and covering top and bottom surfaces of an inner core and said top and bottom edges of said stringer. 
   
   
       15 . The water sports board of  claim 1 , wherein said water sports board comprises surfboards, windsurf boards, kiteboards, wakeboards, wake skates, or body boards. 
   
   
       16 . A water sports board having enhanced flexibility, comprising:
 (a) an elongated core body having a nose end and a tail end, and top and bottom surfaces defining a curved shape of said water sports board; and   (b) two or more elongated planar stringers, each of said stringers having a front end and a rear end, two side surfaces, and top and bottom edges curved to a longitudinal profile of said water sports board, and including multiple elongated slots on said side surfaces, each of said elongated slots disposed along a longitudinal axis of said stringer with a predetermined distance from a midpoint of said longitudinal axis; said two or more planar stringers being disposed along, and symmetrically off, a longitudinal centerline of said core body.   
   
   
       17 . A stringer of a water sports board having enhanced flexibility, said stringer comprising an elongated planar panel having a front end and a rear end, two side surfaces, and top and bottom edges curved to a longitudinal profile of a water sports board, and multiple elongated slots on said side surfaces; each of said multiple elongated slots disposed along a longitudinal axis of said stringer with a predetermined distance from a midpoint of said longitudinal axis. 
   
   
       18 . The water sports board of  claim 17 , wherein said multiple slots are elongated in a direction of said longitudinal axis having a length from about 2 inches to about 10 inches. 
   
   
       19 . The water sports board of  claim 18 , wherein said multiple slots are openings through the width of said stringer. 
   
   
       20 . The water sports board of  claim 17 , wherein said stringer is made of at least one material comprising wood, plywood, carbon fiber, para-aramid synthetic fiber, fiberglass, polyvinyl chloride (PVC), rubber, or a combination thereof.