Surfboards moved by user power

Abstract

Surfboards moved by user power comprises: a surfboard body streamlined, when viewed from a plan view, concave grooves are formed on both sides, respectively; a propulsion body including: a first propulsion body formed with a first propulsion unit that is hinged to one side groove of the surfboard body and is formed inclined with respect to the surfboard body on a lower surface to generate propulsion force according to the movement of the user's feet; and a second propulsion body formed with a second propulsion unit that is hinged to the other side groove of the surfboard body and is formed inclined with respect to the surfboard body on a lower surface to generate propulsion force according to the movement of the user's feet; and a direction change unit including: a rotating shaft passing through the surfboard body; a handle disposed on an upper end of the surfboard body of the rotating shaft to rotate the rotating shaft; and a direction change key that is disposed on a lower part of the surfboard body of the rotating shaft and rotates together with the rotating shaft.

What is claimed is: 
     
         1 . Surfboards moved by user power comprising:
 a surfboard body streamlined, when viewed from a plan view, concave grooves are formed on both sides, respectively;   a propulsion body including:
 a first propulsion body formed with a first propulsion unit that is hinged to one side groove of the surfboard body and is formed inclined with respect to the surfboard body on a lower surface to generate propulsion force according to the movement of the user's feet; and 
 a second propulsion body formed with a second propulsion unit that is hinged to the other side groove of the surfboard body and is formed inclined with respect to the surfboard body on a lower surface to generate propulsion force according to the movement of the user's feet; and 
   a direction change unit including:
 a rotating shaft passing through the surfboard body; 
 a handle disposed on an upper end of the surfboard body of the rotating shaft to rotate the rotating shaft; and 
 a direction change key that is disposed on a lower part of the surfboard body of the rotating shaft and rotates together with the rotating shaft, 
   wherein the direction change unit of surfboards moved by user power comprises a through hole passing through the surfboard body, a rotating member inserted into the through hole and rotated in a direction parallel to the surfboard body, a first folding part coupled to the rotating shaft on an upper portion of the rotating member to fold the rotating shaft, and a folding unit having a second folding part for folding the direction change key on a lower portion of the rotating member.   
     
     
         2 . The surfboards moved by user power according to  claim 1 , further comprising:
 an overturn prevention body having a first prevention body hinged to one side of the front end part of an upper surface of the surfboard body of the surfboards moved by user power and at a different height from the first propulsion body; and   a second overturn prevention body hinged to the other side of a front end part at a different height from the first propulsion body,   wherein the first and second overturn prevention bodies are coupled to the upper surface of the surfboard body, and wherein the first and second propulsion bodies are formed at the same height as the side surface of the surfboard body.   
     
     
         3 . The surfboards moved by user power according to  claim 2 , wherein the first and second propulsion bodies of the surfboard moved by user power are hinged in a ball-socket joint method that freely moves with respect to the surfboard body, and
 wherein through holes are formed in the first and second overturn prevention bodies, and the through holes are inserted into the protrusions protruding from the upper surface of the surfboard body so that the first and second overturn prevention bodies are rotated in a direction parallel to the upper surface of the surface board body.   
     
     
         4 . The surfboards moved by user power according to  claim 2 , wherein a first coupling portion that is separated or coupled to the side of the surfboard body is formed in the first and second propulsion bodies of surfboards moved by user power, and a second coupling portion separated or coupled to the first coupling portion is formed on the side of the surfboard body, and
 wherein a third coupling portion coupled to the upper surface of the surfboard body is formed in the first and second overturn prevention bodies, and a fourth coupling portion coupled to the third coupling portion is formed on the upper surface of the surfboard body.   
     
     
         5 . The surfboards moved by user power according to  claim 1 , further comprising:
 an overturn prevention body including a third overturn prevention body that is hinge-coupled at a different height from the first propulsion body on one side of the rear end part facing the front end part of the upper surface of the surfboard body and a fourth overturn prevention body hinged to the other side of the rear end part at a different height from the first propulsion body,   wherein through holes are formed in the third and fourth overturn prevention bodies, and the through holes are inserted into the protrusions protruding from the upper surface of the surfboard body so that the third and fourth overturn prevention bodies are rotated in a direction parallel to the upper surface of the surfboard body.