Patent Publication Number: US-2023159145-A1

Title: Surfboards moved by user power

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to PCT International Application No. PCT/KR2020/018682 filed on Dec. 18, 2020, which application claims priority to Korean Patent Application No. 10-2020-0100622 filed on Aug. 11, 2021, the entire disclosures of which are expressly incorporated herein by reference. 
    
    
     STATEMENT RE: FEDERALLY SPONSORED RESEARCH/DEVELOPMENT 
     Not Applicable 
     BACKGROUND 
     Technical Field 
     The present invention relates to a surfboard, and more particularly, to a surfboard that can be moved by a user&#39;s power on a calm shore without waves and whose direction also can be changed by using user&#39;s hands during movement. 
     Background Art 
     In general, surfing is a marine sport that competes for height, speed, and skill by riding a surfboard up and down the slope surface of sea waves, and it is a sport that requires a high sense of balance and precise timing. 
     To enjoy surfing, there must be waves, and if there are no waves in the sea, you cannot enjoy surfing. 
     For enjoying surfing in the sea without waves, in Korean Patent Publication No. 2003-0067609, Motor Surfing Board (published on Aug. 14, 2003), a technology that allows you to enjoy surfing in a place where there is no wind or waves by attaching a power device that uses a motor to the surfboard has been disclosed. 
     However, when a motor and the like is mounted on a surfboard to enjoy surfing in a place where there is no wind or waves, since in addition to the motor, various components such as a battery that delivers power to run the motor must be mounted on a very small surfboard, it is not easy to implement and has a problem in that the manufacturing cost is excessively increased. 
     BRIEF SUMMARY 
     Technical Subject 
     The present invention provides surfboards moved by user power that can be moved by a user&#39;s power on a shore without winds or waves and whose direction also can be easily changed by using user&#39;s hands during movement, and after use, each part is folded to enhance the convenience of movement and minimize the storage volume. 
     Technical Solution 
     As an embodiment, surfboards moved by user power comprise: 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&#39;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&#39;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. 
     It further comprises: 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. 
     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 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. 
     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. 
     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, a second coupling portion separated or coupled to the first coupling portion is formed on the side of the surfboard body, a third coupling portion coupled to the upper surface of the surfboard body is formed in the first and second overturn prevention bodies, a fourth coupling portion coupled to the third coupling portion is formed on the upper surface of the surfboard body. 
     The overturn prevention body of surfboards moved by user power further comprises: a third overturn prevention body that is hinged at a different height from the first propulsion body on one side of the rear end part opposite to the front end part of the upper surface of the surfboard body; and an overturn prevention body having 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, and the third and fourth overturn prevention bodies are rotated in a direction parallel to the upper surface of the surfboard body. 
     Advantageous Effects 
     The surfboards moved by user power according to the present invention can be moved by the user&#39;s power on the coast where there are no winds or waves, and the direction can be easily changed using the user&#39;s hand during movement, and have an effect that after use, each part can be folded to enhance the convenience of moving and minimize the storage volume. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and other features and advantages of the various embodiments disclosed herein will be better understood with respect to the following description and drawings, in which like numbers refer to like parts throughout, and in which: 
         FIG.  1    is an external perspective view of surfboards moved by user power according to an embodiment of the present invention. 
         FIG.  2    is a front view in the A direction of  FIG.  1   . 
         FIG.  3    is a cross-sectional view illustrating a ball socket joint of the first and second propulsion bodies illustrated in  FIG.  1   . 
         FIG.  4    is a cross-sectional view illustrating a direction change unit. 
         FIG.  5    is a cross-sectional view illustrating the coupling of an overturn prevention body and a surfboard body according to an embodiment of the present invention. 
         FIG.  6    is an external perspective view of surfboards moved by user power according to another embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     The present invention described hereinafter can apply various transformations and can have various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. 
     However, this is not intended to limit the present invention to specific embodiments, and it should be understood that all modifications, equivalents and substitutes included in the spirit and scope of the present invention are included. In describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted. 
     The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, it should be understood that terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but this does not preclude the possibility of addition or existence of one or more other features or numbers, steps, operations, components, parts, or combinations thereof. 
     In addition, terms such as first, second, and the like may be used to distinguish and describe various components, but the components should not be limited by the above terms. The above terms are used only for the purpose of distinguishing one component from another. 
     In addition, when at least two different embodiments are described in the present application, all or part of the components may be used by merging and interchangeably using with each other, even if there is no particular description within the scope not departing from the technical spirit of the present invention. 
       FIG.  1    is an external perspective view of surfboards moved by user power according to an embodiment of the present invention.  FIG.  2    is a front view in the A direction of  FIG.  1   . 
     Referring to  FIGS.  1  and  2   , a surfboard  600  includes a surfboard body  100 , a propulsion body  200 , and a direction change unit  300 . In addition to this, the surfboard  600  may further include an overturn prevention body  400 . 
     The surfboard body  100  serves as a base for supporting or fixing the propulsion body  200 , the direction change unit  300  and the overturn prevention body  400 . 
     The surfboard body  100  may be made of a variety of highly rigid materials so as to be floated in water. 
     The surfboard body  100  may be formed, for example, in a streamlined shape, a spindle shape, an aerodynamic shape, or a rectangular shape, and the like, and concave grooves  110  may be formed on both sides of the surfboard body  100 , respectively. 
     In one embodiment of the present invention, the shape of the concave grooves  110  respectively formed on both sides of the surfboard body  100  may be formed in a shape corresponding to the propulsion body  200 , which will be described later, when viewed in a plan view. 
     The propulsion body  200  is coupled to the surfboard body  100 . The propulsion body  200  makes it possible to move the surfboard body  100  by purely using the user&#39;s power, not the power generated by a motor. 
     The propulsion body  200  includes a first propulsion body  210  and a second propulsion body  260 . 
     The first propulsion body  210  is formed in a rectangular shape, the first propulsion body  210  is disposed in a concave groove  110  formed on the side of the surfboard body  100 , and the first propulsion body  210  is formed in a shape in close contact with a groove  110 . 
     The first propulsion body  210  may, for example, be formed in a rectangular shape or a streamlined shape, and the first propulsion body  210  may be formed in a width suitable for placing a user&#39;s foot. 
     A strap  215  for preventing the user&#39;s feet from being separated may be formed on the upper surface of the first propulsion body  210 , and an anti-slip pad and the like for preventing the user&#39;s feet from slipping may be placed on the upper surface of the first propulsion body  210 . Unlike this, a concave separation prevention groove may be formed in a portion of the upper surface of the first propulsion body  210  corresponding to the strap  215  so that the user&#39;s foot does not slip. 
     In one embodiment of the present invention, preventing the user&#39;s foot from being separated from the upper surface of the first propulsion body  210  is because propulsion force is generated through a motion in which the user spreads or narrows the first propulsion body  210  in the horizontal direction on the water surface, a motion in which the first propulsion body  210  is elevated and descended up and down with respect to the surfboard body  100 , and a motion in which the first propulsion body  210  is rotated from left to right with respect to the surfboard body  100 , and the like, and at this time, the user&#39;s foot can be easily separated from the first propulsion body  210 . 
     In one embodiment of the present invention, a ball  216  is formed at the front end portion of the first propulsion body  210  to enable the user to perform the motion of widening or narrowing the first propulsion body  210  in the horizontal direction on the water surface, the motion of elevating the first propulsion body  210  up and down with respect to the surfboard body  100 , and the motion of rotating the first propulsion body  210  left and right with respect to the surfboard body  100 . 
       FIG.  3    is a cross-sectional view illustrating a ball socket joint of the first and second propulsion bodies illustrated in  FIG.  1   . 
     Referring to  FIGS.  1  to  3   , a concave groove  112  in which the ball  216  is accommodated is formed in the surfboard body  100 , and the ball  216  is accommodated inside the groove  112 . Then, in order to prevent the ball  216  from being separated from the groove  112 , an anti-separation cover  217  is coupled to the surfboard body  100  so that the first propulsion body  210  is coupled to the surfboard body  100  in a ball-socket joint method. 
     As the first propulsion body  210  is coupled to the surfboard body  100  in a ball-socket joint manner, the surfboard body  100  is enabled to perform the motion of widening or narrowing the first propulsion body  210  in the horizontal direction on the water surface, the motion of elevating the first propulsion body  210  up and down with respect to the surfboard body  100 , and the motion of rotating the first propulsion body  210  left and right with respect to the surfboard body  100 . 
     Meanwhile, a first propulsion unit  220  is formed in the first propulsion body  210  in order to generate propulsion force in the first propulsion body  210  by moving the user&#39;s feet. The first propulsion unit  220  is formed on the lower surface of the first propulsion body  210 , the first propulsion unit  220  is formed in a thin plate shape, and the first propulsion unit  220  is formed inclinedly with respect to the lower surface of the first propulsion body  210 . In one embodiment of the present invention, the first propulsion unit  220  may be formed in a shape tilted with respect to the axial direction of the first propulsion body  210  when viewed in a plan view. 
     On the lower surface of the first propulsion body  210  on which the first propulsion unit  220  is formed, an accommodating unit for accommodating the first propulsion unit  220  by folding may be formed when the surfboard  600  is not in use. 
     The second propulsion body  260  is formed in a rectangular shape, the second propulsion body  260  is disposed in a concave groove  110  formed on the other side of the surfboard body  100 , and the second propulsion body  260  is formed in a shape in close contact with the groove  110 . 
     In one embodiment of the present invention, the second propulsion body  260  may be formed in substantially the same shape and the same size as the first propulsion body  210 . 
     The second propulsion body  260  may be formed, for example, in a rectangular shape or a streamlined shape, and the second propulsion body  260  may be formed in a width suitable for placing a user&#39;s foot. 
     On the upper surface of the second propulsion body  260 , a strap  265  for preventing the user&#39;s feet from being separated may be formed, and on the upper surface of the second propulsion body  260 , an anti-slip pad and the like for preventing the user&#39;s feet from slipping may be disposed. Unlike this, a concave separation prevention groove may be formed in a portion of the upper surface of the second propulsion body  260  corresponding to the strap  265  so that the user&#39;s foot does not slip. 
     In one embodiment of the present invention, a ball  266  is formed at the front end portion of the second propulsion body  260  to enable the user to perform the motion of widening or narrowing the second propulsion body  260  in the horizontal direction on the water surface, the motion of elevating the second propulsion body  260  up and down with respect to the surfboard body  100 , and the motion of rotating the second propulsion body  260  left and right with respect to the surfboard body  100 . 
     Meanwhile, the surfboard body  100  is formed with a concave groove  114  in which the ball  266  is accommodated, and the ball  266  is accommodated inside the groove  114 . Then, to prevent the ball  266  from being separated from the groove  114 , an escape prevention cover  267  is coupled to the surfboard body  100 , so that the second propulsion body  260  is coupled to the surfboard body  100  in a ball-socket joint manner. 
     As the second propulsion body  260  is coupled to the surfboard body  100  in a ball-socket joint manner, the surfboard body  100  is enabled to perform the motion of widening or narrowing the second propulsion body  260  in the horizontal direction on the water surface, the motion of elevating the second propulsion body  260  up and down with respect to the surfboard body  100 , and the motion of rotating the second propulsion body  260  left and right with respect to the surfboard body  100 . 
     Meanwhile, a second propulsion unit  270  is formed in the second propulsion body  260  in order to generate propulsion force in the second propulsion body  260  by moving the user&#39;s feet. The second propulsion unit  270  is formed on the lower surface of the second propulsion body  260 , the second propulsion unit  270  is formed in a thin plate shape, and the second propulsion unit  270  is formed inclinedly with respect to the lower surface of the second propulsion body  260 . 
     In one embodiment of the present invention, the second propulsion unit  270  may be formed in a shape tilted with respect to the axial direction of the second propulsion body  260  when viewed in a plan view. 
     On the lower surface of the second propulsion body  260  on which the second propulsion unit  270  is formed, an accommodating unit for accommodating the second propulsion unit  270  by folding may be formed when the surfboard  600  is not in use. 
     When the user moves the first propulsion body  210  and the second propulsion body  260  connected to the surfboard body  100  with their feet, the surfboard body  100  can be advanced even without wind or waves, and in one embodiment of the present invention, the direction change unit  300  is coupled to the surfboard body  100  so that the user can change the direction of the surfboard body  100  that is being advanced by using the hand. 
     The direction change unit  300  comprises a rotating shaft  310 , a handle  320 , and a direction change key  330 . In one embodiment of the present invention, the direction change unit  300  may further include, as illustrated in  FIG.  4   , a folding unit  340  that allows the rotating shaft  310  and the direction change key  330  to be folded. 
       FIG.  4    is a cross-sectional view illustrating a direction change unit. 
     Referring to  FIG.  4   , the folding unit  340  comprises a through hole  342  penetrating through the surfboard body  100 , a rotating member  344 , a first folding part  346 , and a second folding part  348 . 
     The rotating member  344  is formed in a cylindrical block shape, being rotated inside the through hole  342 , and of course, the rotating member  344  has a structure not to be separated out of the through hole  342 . 
     A first folding part  346  coupled to the rotating shaft  310  is formed on the upper surface of the rotating member  344 . The first folding part  346  includes plates formed to stand up as a pair on the upper surface of the rotating member  344 , and a rotating shaft  310 , which will be described later, is inserted between the first folding parts  346 , and the first folding part  346  and the rotating shaft  310  are coupled by a hinge pin. 
     The rotating shaft  310  is, for example, formed in a cylindrical shape, and the rotating shaft  310  is hinge-coupled to a hinge pin in a state disposed between the first folding parts  346 . 
     When the rotating shaft  310  is twisted while the rotating shaft  310  is coupled to the hinge pin, the rotating member  344  is rotated by the torsional moment of the rotating shaft  310 . Meanwhile, the rotating shaft  310  may be folded in a vertical state or a horizontal state with respect to the surfboard body  100  by a hinge pin. 
     The handle  320  is coupled to the upper end of the rotation shaft  310 , and the handle  320  allows the user to change the direction by twisting the rotation shaft  310  with a less force. 
     The direction change key  330  is coupled to the lower surface of the rotating member  344  by a second folding part  348 , and the direction change key  330  can be folded vertically or horizontally with respect to the surfboard body  100  by the second folding part  348 . 
     Meanwhile, the direction change key  330  is rotated together with the rotating member  344 , the rotating member  344  is rotated by the rotating shaft  310 , and since the rotation shaft  310  is rotated by the handle  320 , as the user rotates the handle  320 , the direction change key  330  is also rotated with the handle  320  so that the user can change the direction of the surfboard body  100  by hand. 
     Referring back to  FIG.  1   , in one embodiment of the present invention, the upper surface of the surfboard body  100  may be formed with a groove  120  formed in a shape and size corresponding to the direction change unit  300 , and as a result, the direction change unit  300  is accommodated in the groove  120  while being folded, thereby preventing an increase in volume due to the direction change unit  300 . 
     Referring back to  FIGS.  1  and  2   , the overturn prevention body  400  prevents the surfboard body  100  from being overturned and allows the user to more easily maintain the balance. In the case of the skilled, it is not necessary to deploy the overturn prevention body  400 , but in the case of a beginner or intermediate user, it is possible to prevent falling down on the water surface by deploying the overturn prevention body  400 . 
     The overturn prevention body  400  is hinged coupled to the front end part of the upper surface of the surfboard body  100  at a different height from the first and second propulsion bodies  210  and  260  so that the interference with the first and second propulsion bodies  210  and  260  can be prevented. 
     For example, the overturn prevention body  400  is disposed on the upper surface of the surfboard body  100 , and the first and second propulsion bodies  210  and  260  may be disposed at positions corresponding to the sides of the surfboard body  100 . 
     Although in one embodiment of the present invention, the overturn prevention body  400  disposed on the upper surface of the surfboard body  100  is illustrated and described, but unlike this, the overturn prevention body  400  may be disposed on the lower surface of the surfboard body  100 . 
     The overturn prevention body  400  may include a first overturn prevention body  410  and a second overturn prevention body  420 . 
     The first overturn prevention body  410  formed in a rectangular shape is deployed to one side of the surfboard body  100 , and the second overturn prevention body  420  formed in a rectangular shape is deployed to the other side facing the one side of the surfboard body  100 . 
       FIG.  5    is a cross-sectional view illustrating the coupling of an overturn prevention body and a surfboard body according to an embodiment of the present invention. 
     Referring to  FIG.  5   , the front end part of the first and second overturn prevention bodies  410  and  420  of the overturn prevention body  400  is formed with a through hole, the front end part of the surfboard body  100  has a pair of protrusions  102  formed to be spaced apart are formed. The first and second through holes formed at the ends of the overturn prevention bodies  410  and  420  are inserted into the protrusions  102 , due to this, the first and second overturn prevention bodies  410  and  420  are rotated in the horizontal direction with respect to the surfboard body  100 . 
     Referring back to  FIG.  1   , in order to minimize the volume of the propulsion body  200  to facilitate storage and transport when the surfboard  600  is not in use, a first coupling portion  218  that is separated or coupled to the side of the surfboard body  100  is formed in the first and second propulsion bodies  210  and  260 , and a second coupling portion  103  coupled to the first coupling portion  218  is formed in the surfboard body  100 . 
     For example, the first coupling part  218  may be a protrusion, and the second coupling part  103  may be a groove into which the protrusion is inserted and fitted. 
     Meanwhile, in order to minimize the volume of the overturn prevention body  400  to facilitate storage and transport when the surfboard  600  is not in use, a third coupling part  402  that is separated or coupled to the to the upper surface of the surfboard body  100  is formed, and a fourth coupling part  105  coupled to the third coupling part  402  is formed on the upper surface of the surfboard body  100 . 
     For example, the third coupling part  402  may be a protrusion, and the fourth coupling part  105  may be a groove coupled to the third coupling part  402 . 
       FIG.  6    is an external perspective view of surfboards moved by user power according to another embodiment of the present invention. The surfboard moved by user power illustrated in  FIG.  6    has substantially the same configuration as the surfboard moved by user power illustrated and described in  FIGS.  1  to  5    except for the third and fourth overturn prevention bodies  430  and  440 . Therefore, duplicate descriptions of the same components will be omitted, and the same names and reference numerals will be given to the same components. 
     Referring to  FIG.  6   , the overturn prevention body  400  of the surfboard moved by user power according to another embodiment of the present invention may include a third overturn prevention body  430  and a fourth overturn prevention body  440 . 
     The third overturn prevention body  430  and the fourth overturn prevention body  440  are hinge-coupled at a different height from the first and second propulsion bodies  210  and  260  on one side and the other side of the rear end part of the upper surface of the surfboard body  100  so that it is possible to prevent interference with the first and second propulsion bodies  210  and  260 . 
     For example, the third overturn prevention body  430  and the fourth overturn prevention body  440  are disposed on the upper surface of the surfboard body  100 , and the first and second propulsion bodies  210  and  260  may be disposed at positions corresponding to the sides of the surfboard body  100 . 
     Although in one embodiment of the present invention, the third overturn prevention body  430  and the fourth overturn prevention body  440  disposed on the upper surface of the surfboard body  100  are illustrated and described, but unlike this, the third overturn prevention body  430  and the fourth overturn prevention body  440  may be disposed on the lower surface of the surfboard body  100 . 
     The third overturn prevention body  430  formed in a rectangular shape is deployed to one side of the surfboard body  100 , and the fourth overturn prevention body  440  formed in a rectangular shape is deployed to the other side facing the one side of the surfboard body  100 . 
     A through hole is formed in the front end part of the third and fourth overturn prevention bodies  430  and  440 , and a pair of protrusions  102  spaced apart from each other is formed at the rear end part facing the front end part of the surfboard body  100  is formed. The through holes formed in the front end part of the third and fourth overturn prevention bodies  430  and  440  are inserted into the protrusions  102 , and due to this, the third and fourth overturn prevention bodies  430  and  440  are rotated in the horizontal direction with respect to the surfboard body  100 . 
     Meanwhile, to minimize the volume of the overturn prevention body  400  to facilitate storage and transport when the surfboard  600  is not used, a third coupling part  402  that is separated or coupled to the upper surface of the surfboard body  100  is formed in the third and fourth overturn prevention bodies  430  and  440 , and a fourth coupling part  105  coupled to the third coupling part  402  is formed on the upper surface of the surfboard body  100 . 
     For example, the third coupling part  402  is a protrusion, and the fourth coupling part  105  may be a groove coupled to the third coupling part  402 . 
     The third and fourth overturn prevention bodies  430  and  440  prevent the surfboard body  100  and the user from overturning backwards and make it easier for users to balance. In particular, when all of the first to fourth overturn prevention bodies  410 ,  420 ,  430 , and  440  are used, it is possible to easily maintain a balance on the water surface, so even beginners in surfing can easily enjoy surfing. 
     In particular, the user can selectively deploy and use the first to fourth overturn prevention bodies  410 ,  420 ,  430 , and  440  according to the user&#39;s skill level. For example, only the first and second overturn prevention bodies  410  and  420  coupled to the front end part of the surfboard body  100  or the third and fourth overturn prevention bodies  430  and  440  coupled to the rear end part of the surfboard body  100  can also be optionally deployed and used. 
     According to the detailed description above, it is possible to move by the user power on a sea coast where there are no winds or waves, direction can be easily changed by using user&#39;s hands while moving, and there is an effect that each part can be folded to improve the convenience of moving and minimize the storage volume. 
     Meanwhile, the embodiments disclosed in the drawings are merely presented as specific examples to aid understanding, and are not intended to limit the scope of the present invention. It is obvious to those of ordinary skill in the art to which the present invention belongs that other modified embodiments based on the technical spirit of the present invention can be implemented in addition to the embodiments disclosed herein.