Patent Publication Number: US-2017350680-A1

Title: Feathers of an arrow

Description:
TECHNICAL FIELD 
     This application claims priority to and the benefit of Korean Utility Model Application No. 20-2016-0003058 filed in the Korean Intellectual Property Office on Jun. 3, 2016, the entire contents of which are incorporated herein by reference. 
     The present invention relates to the improved feathers of an arrow, and more particularly, to the improved feathers of an arrow, which prevent instability of flight caused by a vortex generated during the flight of the arrow by forming a plurality of arrow feathers attached to the arrow, which has a cross section which is a curved surface and integrally forming an auxiliary surface having one surface which is the curved surface with the arrow feather to guarantee stable flight. 
     BACKGROUND ART 
     An arrow which is used for notching and shooting at a string of a bow, is constituted by an arrow shaft, an arrow pile, a fletching, and a nock. The arrow pile is mounted at the front end of the arrow shaft and the nock is mounted at the end of the arrow shaft for notching the string of the bow. 
     In general, the arrow that leaves the string of the bow flies toward a target with a parabola and in this case, the arrow flies while swinging back and forth and left and right around the center of gravity of the arrow. 
     In other words, the arrow does not fly straight toward the target, but flies while staggering as if the fish swims. Such a phenomenon is called a paradox phenomenon and the fletching serves to make the arrow fly straightly by air resistance by preventing the staggering. 
     Further, the arrow flies while rotating by the air resistance applied to the fletching of the arrow and the rotating arrow flies more steadily than an unrotated arrow. That is, the arrow is stably moved by giving a slight pitch to the direction of the fletching mounted on the arrow shaft and such an effect is called a gyro effect. 
     When the related art of the arrow is described, an arrow of Korean Patent Registration No. 10-1399544 (registration date: May 20, 2014) is characterized in that a diameter of a shaft  110  in which a point  120  is joined to a front end and a nock  140  is joined to a rear end is formed to decrease from the front end to the rear end to move the center of gravity in a front-end direction and control bending deformation, and the shaft  110  is divided into three parts, and a shaft front-end portion a is a portion joined with the point  120  and having a larger diameter to other portions, a shaft middle-end portion b extends from the shaft front-end portion a and has a diameter which becomes gradually smaller and smaller than the shaft front-end portion a, and a shaft rear-end portion c extends from the shaft middle-end portion b and constantly has the same diameter as a last portion of the shaft middle-end portion b. 
     Meanwhile, when a detailed configuration of arrow feathers constituting the arrow is described,  FIG. 1  is a perspective view of conventional general feathers of an arrow and  FIG. 2  is a schematic view illustrating a connection type of the arrow and the arrow feathers as illustrated in  FIGS. 1 and 2 . 
     The conventional arrow feather  10  has an arrow pile  12  and a nock  13  formed at both ends of an arrow shaft  11  and a plurality of arrow feathers  14  are bonded to the surface of the arrow shaft  11  to be integrally formed at the front of the nock  13 . 
     In addition, arrows users prevents occurrence of initial penetration resistance by wrapping a tape  15  on an attachment portion of a front portion of the arrow feather  14  he tape in order to prevent occurrence of sensitive resistance in the process of flying the arrow. 
     However, when the tape is attached to prevent the initial penetration resistance as described above, problems such as an increase in weight of the arrow and the psychological weight of the user are caused. 
     When the related art is described as an effort for solving the problem, a fletching for an arrow of Korean Patent Application Publication No. 10-2010-0132203 (publication date: Dec. 17, 2010) includes a frame  111  having the inside of an outer periphery is formed to be opened and forming an overall frame, multiple longitudinal rods  114  connecting the top and the bottom of the frame and disposed to be spaced apart from each other in the longitudinal direction of the frame, a wing part  110  constituted by a thin film  112  formed in an empty space divided by the frame and the longitudinal rod, and a boded part  120  positioned on the bottom of the wing part and attached to an arrow shaft. 
     However, even in the process of the flight of the arrow feather having the above configuration, the vortex is generated due to a thin film formed between longitudinal rods, and as a result, the flight is not stable and an unstable phenomenon continuously occurs. 
     DISCLOSURE 
     Technical Problem 
     The present invention is contrived by considering the situation and an object of the present invention is to provide the improved feathers of an arrow, which divides and derives a flow of air which influences the arrow feather while maintaining a predetermined shape in the process of flying an arrow to resolve initial penetration resistance generated at a connection portion of an arrow shaft and the arrow feather when the arrow flies and prevent a vortex generated if the air passes through the arrow feather, thereby remarkably increasing a flight safety, straightness, and a hit rate of the arrow. 
     In particular, an object of the present invention is to provide the improved feather of an arrow, which can resolve a problem that a user feels a psychological weight without the need for a process such as taping a connection portion of the arrow shaft and the arrow feather in order for a user of the arrow to secure a flight safety of the arrow. 
     Technical Solution 
     The object of the present invention can be achieved by improved feathers of an arrow in which arrow head and a notch are formed at both ends of an arrow shaft and a plurality of arrow feathers are bonded to the surface of the arrow shaft to be integrally formed at the front of the notch, including: an attachment surface  120  curved in a direction opposite to a curved direction of a body  110  and an auxiliary surfaced  130  curved in the same or similar shape as a curved shape of the body by separating a part of the inner surface body  110 , which are integrally formed at a lower portion of the body  110  curved in one direction. 
     The plurality of auxiliary surfaces  130  is formed on the inner surface of the body  110 . 
     The auxiliary surface  130  has a smooth flat plate shape. 
     The attachment surface  120  is curved with the same arc as the surface of the arrow shaft to which the arrow feathers  100  are attached. 
     Advantageous Effects 
     The improved arrow feather according to the present invention maintains a predetermined shape and a body is formed to be curved in one direction in the process of flying the arrow and in particular, the flow of the air which is applied to the arrow feather is divided and derived by a curved auxiliary surface in the body to prevent the vortex from being generated by the arrow feather when the arrow flies or the vortex is divided and distributed to improve the flight safety and the straightness, thereby remarkably increasing the hit rate. 
     That is, the vortex generated by the arrow feather is resolved and the initial penetration resistance of air which flows into the arrow feather is decreased to induce stable flight. 
     In particular, the user can resolve a psychological weight without the need for a process such as taping a connection portion of the arrow shaft and the arrow feather in order for the user of the arrow to secure the flight safety of the arrow. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view illustrating a conventional arrow. 
         FIG. 2  is a schematic side view of a state in which an arrow feather is attached to an arrow shaft in the convention arrow. 
         FIG. 3  is a perspective view of a state in which an improved arrow feather is attached to an arrow shaft according to the present invention. 
         FIG. 4  is a side view of the state in which the improved arrow feather is attached to the arrow shaft according to the present invention. 
         FIG. 5  is a cross-sectional view of  FIG. 3  taken along line A-A. 
         FIGS. 6 to 8  are side views illustrating another embodiment of the improved arrow feather according to the present invention. 
         FIG. 9  is a view illustrating the difference between a case where auxiliary surface is formed and another case where auxiliary surface is not formed in generation of vortex. 
     
    
    
     MODE FOR INVENTION 
     Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. 
     An embodiment to be described below is intended to be described in detail to enable those skilled in the art to easily carry out the invention and it is not meant that the technical spirit and scope of the present invention are limited thereto. 
     In addition, the size and shape of the components illustrated in the drawings may be enlarged for clarity and convenience of description, and terms particularly defined in consideration of a configuration and an operation of the present invention may vary depending on the intention or custom of a user or an operator and it should be noted that the definitions of the terms should be made based on contents throughout the present specification. 
     Among the accompanying drawings,  FIG. 3  is a perspective view of a state in which an improved arrow feather is attached to an arrow shaft according to the present invention,  FIG. 4  is a side view of the state in which the improved arrow feather is attached to the arrow shaft according to the present invention,  FIG. 5  is a cross-sectional view of  FIG. 3  taken along line A-A, and  FIGS. 6 to 8  are side views illustrating another embodiment of the improved arrow feather according to the present invention. 
     As illustrated, in the improved arrow feather  100  according to the present invention, an attachment surface  120  that is bent from a body  110  and attached to the surface of an arrow shaft  11  is integrally formed at a lower portion of the body  110  curved in one direction. 
     The body  110  generally has a substantially rounded shape in one direction. 
     The attachment surface  120  is configured to have the same arc as the arrow shaft  11  attached by bending the lower portion of the body  110  in a direction opposite to the rounding direction of the body  110 . 
     That is, since the attachment surface  120  has the same curved surface as the surface of the arrow shaft  11  in the process of attaching the arrow feathers  100  to the arrow shaft  10 , the arrow feathers  100  may be completely in close contact with the arrow shaft  11  to minimize initial penetration resistance generated at a connection portion of the arrow shaft  11  and the arrow feathers  100  while the arrow flies. The reduction of the initial penetration resistance also reduces the central resistance generated at the center of the arrow feathers  100 , thereby inducing a stable flow of air. Since the arrow shaft  11  and the arrow feathers  100  are closely contacted with each other, the initial penetration resistance is reduced and taping of the connecting portion is unnecessary, thereby eliminating a psychological weight increase factor of a user. 
     Meanwhile, the present applicant forms an auxiliary surface  130  integrally formed with the body  110  on the inner surface of the body  110  in order to stably enhance flyability by resolving a vortex generated during flying of the arrow feathers configured as above to remove and dividedly distribute the vortex generated on the inner surface of the arrow feathers while the arrow flies, thereby enhancing flight straightness. 
     That is, the auxiliary surface  130  is formed on a curved inside of the curved inner surface of the body  110 , and a part of the inner surface of the body  110  is separated and bent in the same or similar shape as the curved shape of the body. 
     As illustrated in the  FIG. 9 , the body  110  of the arrow feathers  100  is curved to induce the arrow to rotate during flight, thereby improving the flight straightness. However, the vortex is generated in the air passing through the curved inner portion of the arrow feathers and the straightness of the arrow is not uniform due to swinging due to the vortex during the flight of the arrow, and the same problem may not be ensured due to the speed of flight and factors of a surrounding environment. 
     The present applicant enhances the flight safety and the straightness of the arrow by separating a part of the auxiliary surface  130  on the curved inner surface of the body  110  of the arrow feathers  100  and integrally forming the auxiliary surface  130  which protrudes on the inner surface of the body  110 . 
     In other words, as illustrated in the figure, the air introduced by the auxiliary surface  130  is divided while colliding with the auxiliary surface  130  from the entrance portion before the vortex of the air is generated in the process of passing through the curved inner portion of the arrow feathers to prevent the vortex from being generated and the air passing through the inside of the arrow feathers is uniformly passed to stabilize the flight of the arrow and enhance the straightness, thereby remarkably increasing the hit rate. 
     Meanwhile, the auxiliary surface  130  may be formed in various shapes and positions as shown in  FIGS. 6 to 8 . 
     That is, as illustrated in  FIG. 6 , the auxiliary surface  130  may be formed on the top of the body  110 , as illustrated in  FIG. 7 , a plurality of auxiliary surfaces may be configured, or as illustrated in  FIG. 8 , the auxiliary surface  130  may be formed to have a flat plate shape without being curved. 
     The described auxiliary surface may be formed integrally with the body  110  at various positions on the inner surface of the body  110  in addition to the exemplified positions. 
     That is, the arrow  10  flies while being rotated by the curved body  110  of the arrow feathers  100  and in this case, the air flowing into the inside of the body  110  is divided while colliding with the auxiliary surface  130  and the flow of the air is stably induced to prevent the generation of the vortex of the air flowing into the body  110 , thereby assuring the stable flight of the arrow. 
     Although the present invention has been described in association with the aforementioned preferred embodiment, it can be easily recognized by those skilled in the art that various modifications and changes can be made without departing from the gist and the scope of the present invention and it is apparent that the changes and modifications are all included in the appended claims. 
     SEQUENCE LIST TEXT 
     
         
         
           
               100 : Arrow feathers 
               110 : Body 
               120 : Attachment surface 
               130 : Auxiliary surface