Abstract:
A crossbow includes a bowstring for firing an arrow combined therewith in the lengthwise direction of the crossbow body so as to be manufactured in a structure that does not have a bow on the crossbow body. Thus, carrying convenience can be provided, and at the same time, the maximum effective range of the crossbow can be adjusted by adjusting the tension of the bowstring.

Description:
BACKGROUND 
       [0001]    The present invention relates to a crossbow used for leisure and hunting and, more particularly, to a crossbow which has a bowstring for firing an arrow combined with the body of the crossbow in the lengthwise direction thereof and which is fabricated to have a structure not having a bow in the body of the crossbow in order to provide the carrying convenience of the crossbow and to control a maximum effective range of the crossbow by controlling the elasticity of a bowstring. 
         [0002]    In general, a crossbow is an apparatus for putting an arrow on a firing device having a wood stick form and firing the arrow and is an improved weapon having a longer range of fire and stronger penetration power than a common bow. The crossbow has a basic structure in which a groove for determining the direction of an arrow and a device for firing the arrow are combined at the center of the firing device. In modern times, the materials and structure of the crossbow have been variously improved and used for hunting and leisure. 
         [0003]    “Korean Utility Model No. 20-0226759 (Mar. 29, 2001)” was disclosed as such a crossbow. Such a crossbow is configured to include a housing added to the front of a main body to which an arrow track, an aiming unit, a trigger, are added, a compression piece opened and closed by a hinge at the top of a mounting groove provided in the housing, an opening and closing means formed of a handle and a clamper for fixing and releasing the compression piece, and a clamping nut for fixing a rim frame inserted into the compression piece. 
         [0004]    In such a conventional crossbow, the rim frame can be combined with and separated from a mounting unit easily and rapidly because the compression piece that is opened and closed up and down is added to the front of the main body, and the main body and the rim frame can be separated and kept in a case for portability, thereby enabling the crossbow to be easily used. 
         [0005]    However, the conventional crossbow has a disadvantage in that the rim frame having a string combined with a rim must be used in order to fire an arrow. Furthermore, the conventional crossbow is problematic in that production costs are increased in fabricating the crossbow because the rim that generates tension for firing an arrow is made of expensive materials having high strength and high elasticity properties and it is inconvenient to use the crossbow because the rim frame must be combined with and separated from the main body of the crossbow. 
         [0006]    Furthermore, the conventional crossbow has disadvantages in that it is impossible to hit the mark exceeding a maximum effective range of the crossbow because an arrow is fired using some elasticity of the rim and the string and that it becomes more difficult to load an arrow on the string if the maximum effective range of the crossbow is increased by increasing the elasticity of the rim and string of the crossbow. As a result, the conventional crossbow is problematic in that the maximum effective range of the crossbow is limited. 
       SUMMARY OF THE INVENTION 
       [0007]    An object of the present invention that has been made to solve problems, such as those described above, is to provide an improved crossbow in which an arrow track capable of pulling a bowstring is combined with the body of the crossbow in front thereof in its lengthwise direction and the crossbow is fabricated to have a structure in which an arrow is fired using the elasticity of the bowstring put over the arrow track, thereby simplifying the structure of the crossbow and enhancing the carrying convenience of the crossbow. 
         [0008]    Furthermore, another object of the present invention is to provide an improved crossbow whose maximum effective range can be optionally controlled by a user by controlling the elasticity of a bowstring in such a way as to forward and backward move an arrow track combined with the front part of the body of the crossbow. 
       TECHNICAL SOLUTION 
       [0009]    In accordance with an aspect of the present invention for accomplishing the above objects, a crossbow according to the present invention includes a body which is formed in a gun form and in which a latch protrusion connected to a trigger and moved up and down is installed at the center within the body, the trigger connected to the body through coupling shafts protruded on both sides of the lower part of the latch protrusion moves the latch protrusion up and down, a handle is integrated with the body in the rear of the trigger and protruded from the body, and fixing rollers are combined with the ends of the front part of the trigger; an arrow track in which a fixing pipe is inserted into the upper end of the front of the body and combined with the body, a control pipe is combined with the fixing pipe so that the control pipe slides within the fixing pipe forward and backward, and a pair of front rollers is combined with the respective ends of the front part of the control pipe; a projectile in which a latching hole is formed so that the projectile is hung on the latch protrusion of the body, a bowstring is connected to the front of the projectile, and a latching strap hung on a latching hook formed in the arrowhead of an arrow is formed in the rear of the projectile; and the bowstring which is combined with the fixing rollers of the body through the front rollers of the arrow track from the projectile and which fires the projectile toward the front of the body when the trigger works. 
         [0010]    Furthermore, roller coupling plates with which the front rollers are combined are combined with the front of the control pipe of the arrow track, and a guide ring and a loading ring are combined with the respective upper and lower parts of the front parts of the roller coupling plates. 
         [0011]    Furthermore, the control pipe includes elastic members having one ends combined with insertion holes that are inserted into both sides of the control pipe and formed in the control pipe and elastic protrusions combined with the other ends of the elastic members and elastically supported by the elastic members so that the elastic protrusions are inserted into the insertion holes and externally protruded from the control pipe. Fixing holes into which the elastic protrusions are inserted are formed to penetrate the fixing pipe on both sides of the fixing pipe. When the control pipe slides within the fixing pipe, the elastic protrusions are inserted into the fixing holes and the control pipe is fixed to the fixing pipe. 
         [0012]    Furthermore, range control divisions  226  are formed on the side of the control pipe. 
         [0013]    Furthermore, a loading plate is combined with the upper part of the rear of the body so that the arrow shaft of the arrow is inserted into the loading plate. 
         [0014]    Furthermore, a safety device is inserted into the lower part of the latch protrusion of the body and combined with the latch protrusion in such a way as to operate within the body backward and forward so that the safety device blocks a space to which the latch protrusion comes down and the latch protrusion is prevented from moving downward. 
         [0015]    Furthermore, the improved crossbow further includes a protection plate provided on one side of the side of the body and upward bent from the body. 
         [0016]    Furthermore, a scope is fit into one side of the lower part of the protection plate and combined with the protection plate. 
         [0017]    Furthermore, the improved crossbow further includes a cover plate including the upper plate and the lower plate at the lower part of the fixing pipe of the arrow track. 
         [0018]    Furthermore, a coupling pin having both ends separated is coupled with the center of the fixing rollers and the front rollers. The coupling pin is fixed to the fixing rollers and the front rollers when the coupling pin is dissembled and assembled through a spiral coupling method. 
         [0019]    Furthermore, the bowstring is divided into a first part, a second part, and a third part. The first part is fixed to the fixing rollers. The second part is extended on the front rollers. The third part is fixed to the front of the projectile and combined with the projectile. 
         [0020]    Furthermore, the areas of the first part, the second part, and the third part when the first, the second, and the third parts are cut in a vertical plane in a lengthwise direction of the bowstring are fabricated to be different. 
         [0021]    Furthermore, the bowstring has a smaller area from the first part to the third part. 
       Advantageous Effects 
       [0022]    As described above, in accordance with the present invention, the arrow track capable of pulling the bowstring is combined with the body of the crossbow in front thereof in the lengthwise direction of the body and the crossbow is also fabricated to have a structure in which an arrow is fired using the elasticity of the bowstring put over the arrow track. Accordingly, an improved crossbow having enhanced carrying convenience can be provided because the structure of the crossbow is simplified. 
         [0023]    Furthermore, in accordance with the present invention, there can be provided an improved crossbow whose maximum effective range can be optionally controlled by a user by controlling the elasticity of a bowstring in such a way as to forward and backward move an arrow track combined with the front part of the body of the crossbow. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0024]      FIG. 1  is a perspective view illustrating an improved crossbow in accordance with a first preferred embodiment of the present invention. 
           [0025]      FIG. 2  is an exploded perspective view illustrating the improved crossbow in accordance with the first preferred embodiment of the present invention. 
           [0026]      FIG. 3  is a cross-sectional view illustrating the improved crossbow in accordance with the first preferred embodiment of the present invention. 
           [0027]      FIG. 4  is a side view illustrating the bowstring of the improved crossbow in accordance with the first preferred embodiment of the present invention. 
           [0028]      FIGS. 5 and 6  are state diagrams illustrating the state in which the improved crossbow in accordance with the first preferred embodiment of the present invention is used. 
           [0029]      FIGS. 7 and 8  are diagrams illustrating the state in which the arrow of the improved crossbow in accordance with the first preferred embodiment of the present invention is fired. 
           [0030]      FIG. 9  is a diagram illustrating the state in which the safety device of the improved crossbow in accordance with the first preferred embodiment of the present invention has been driven. 
           [0031]      FIG. 10  is a diagram illustrating the state in which the arrow of the improved crossbow in accordance with the first preferred embodiment of the present invention has been fired. 
           [0032]      FIG. 11  is a cross-sectional view illustrating that the length of the arrow track of the improved crossbow in accordance with the first preferred embodiment of the present invention has been controlled. 
           [0033]      FIG. 12  is an exploded perspective view illustrating an improved crossbow in accordance with a second preferred embodiment of the present invention. 
           [0034]      FIG. 13  is a perspective view illustrating the bowstring of the improved crossbow in accordance with the second preferred embodiment of the present invention. 
       
    
    
     DESCRIPTION OF REFERENCE NUMERALS 
       [0000]    
       
         
           
               100 : body  101 : compartment  102 : fastening hole 
               103 : insertion hole  104 : loading plate  105 : handle 
               110 : trigger  111 : coupling ring  112 : hinge shaft 
               120 : latch protrusion  121 : coupling shaft  122 : spring 
               130 : protection plate  140 : scope  150 : safety device 
               200 : the arrow track  210 : fixing pipe  220 : control pipe 
               222 : front roller  223 : roller coupling plate  224 : loading ring 
               225 : guide ring  230 : elastic member  240 : elastic protrusion 
               250 : fixing hole  260 : insertion hole  300 : projectile 
               310 : latching hole  320 : latching strap  400 : bowstring 
               500 : cover plate  510 : upper plate  520 : lower plate 
               600 : arrow  610 : arrowhead  611 : latching hook 
               620 : arrow shaft  700 : coupling pin 
           
         
       
     
       DETAILED DESCRIPTION OF THE INVENTION 
       [0048]    The merits and characteristics of the present invention and a method for achieving the merits and characteristics will become more apparent from embodiments described in detail later in conjunction with the accompanying drawings. However, the present invention is not limited to the disclosed embodiments, but may be implemented in various different ways. The embodiments are provided to only complete the disclosure of the present invention and to allow those skilled in the art to understand the category of the present invention. The present invention is defined by the category of the claims. The same reference numbers will be used to refer to the same or similar parts throughout the drawings. 
         [0049]    The present invention is described with reference to the drawings for illustrating an improved crossbow in connection with the embodiments of the present invention. 
         [0050]      FIG. 1  is a perspective view illustrating an improved crossbow in accordance with a first preferred embodiment of the present invention.  FIG. 2  is an exploded perspective view illustrating the improved crossbow in accordance with the first preferred embodiment of the present invention.  FIG. 3  is a cross-sectional view illustrating the improved crossbow in accordance with the first preferred embodiment of the present invention.  FIG. 4  is a side view illustrating the bowstring of the improved crossbow in accordance with the first preferred embodiment of the present invention. 
         [0051]    Referring to  FIGS. 1 to 4 , first, a body  100  is formed to have a specific length in a gun form. 
         [0052]    That is, a general shape of the body  100  is the same as that of the body of a common crossbow. The body  100  has a basic body shape of a conventional crossbow in which a handle  105  is formed at the bottom of the body, and it is made of wood or synthetic resin materials. 
         [0053]    Furthermore, a latch protrusion  120  is combined with the body  100  toward the inside of the body on one side of the upper part of the body  100  in such a way to be upwardly protruded. 
         [0054]    The latch protrusion  120  has a cylindrical shape. Coupling shafts  121  are formed on one side of the lower part of the latch protrusion  120  in such a way as to be protruded on both sides of the latch protrusion  120 . 
         [0055]    Furthermore, a spring  122  for applying elasticity to the latch protrusion  120  is combined with the upper part of the coupling shafts  121 . 
         [0056]    In this case, the latch protrusion  120  is combined with the body  100  in such a way as to be upwardly protruded from the body  100  by means of the elasticity of the spring  122 . 
         [0057]    Furthermore, the latch protrusion  120  is combined with a compartment  101  formed within the body  100 . The latch protrusion  120  is inserted into a fastening hole  102  formed to penetrate the body on one side of the center of the compartment  101  in such a way as to vertically move up and down. 
         [0058]    Meanwhile, a trigger  110  for moving the latch protrusion  120  up and down is combined with the latch protrusion  120  so that it is connected to the latch protrusion  120  on one side of the lower part of the body  100 . 
         [0059]    Coupling rings  111  are formed on both sides of the trigger  110  on one side of the upper part of the trigger  110 . 
         [0060]    The coupling rings  111  are combined with the coupling shafts  121  at the lower part of the latch protrusion  120 . 
         [0061]    A hinge shaft  112  is formed on the other side of the upper part of the trigger  110 . Furthermore, the hinge shaft  112  is combined with one side of the lower part of the body  100 , and the trigger  110  moves around the hinge shaft  112 . 
         [0062]    In this case, when the trigger  110  is combined with one side of the lower part of the body  100 , the coupling rings  111  of the trigger  110  are coupled with the respective coupling shafts  121  of the latch protrusion  120  in such a way as to be engaged therewith. Furthermore, when a user pulls the trigger  110  backward, the trigger  110  moves around the hinge shaft  112 , and thus the coupling rings  111  of the trigger  110  lower the latch protrusion  120  downward. Furthermore, when a user releases a force that pulls the trigger  110 , the latch protrusion  120  returns to the original state by means of the spring  122  combined with the latch protrusion  120 . 
         [0063]    An arrow track  200  includes a fixing pipe  210  and a control pipe  220 . 
         [0064]    The fixing pipe  210  is inserted into the end of the upper part of the body  100  at the front of the body  100  and combined therewith. 
         [0065]    Furthermore, the fixing pipe  210  has a circular pipe form having a specific length. A part on one side of the fixing pipe  210  is inserted into the front part of the body  100  and firmly fixed thereto. 
         [0066]    The control pipe  220  is combined with the inside of the fixing pipe  210  in such a way as to slide forward and backward. 
         [0067]    Furthermore, the control pipe  220  is fabricated to have the same inside diameter as the fixing pipe  210  and may slide forward and backward without shaking when it is inserted into the fixing pipe  210 . 
         [0068]    Furthermore, a pair of front rollers  222  is combined with the respective ends of the control pipe  220  at the front thereof so that they pull a bowstring  400 . 
         [0069]    That is, since the control pipe  220  is inserted into the fixing pipe  210  and is able to slide forward and backward, the bowstring  400  is pulled to the maximum extent depending on the protrusion length of the control pipe  220  and is able to maximize the tension of the bowstring  400 . 
         [0070]      FIG. 11  is a cross-sectional view illustrating that the length of the arrow track of the improved crossbow in accordance with the first preferred embodiment of the present invention has been controlled. 
         [0071]    Referring to  FIG. 11 , elastic members  230  that have respective one ends combined with insertion holes  260  concaved and formed on both sides and elastic protrusions  240  that are combined with the other ends of the elastic members  230  and elastically supported by the elastic members  230  in such a way as to be concaved into the insertion holes  260  and outward protruded from the control pipe  220  are formed in the control pipe  220 . 
         [0072]    Furthermore, fixing holes  250  into both sides of which the elastic protrusions  240  are inserted are formed to penetrate the fixing pipe  210 . 
         [0073]    That is, when the control pipe  220  slides within the fixing pipe  210 , the elastic protrusions  240  are inserted into the fixing holes  250  and thus the control pipe  220  is fixed to the fixing pipe  210 . 
         [0074]    Furthermore, when the elastic protrusions  240  are pressed by a user in the state in which the elastic protrusions  240  have been inserted into the fixing holes  250 , the elastic protrusions  240  are inserted into the insertion holes  260  and simultaneously pulled out from the fixing holes  250 . At this time, the control pipe  220  is able to slide in the state in which it has been inserted into the fixing pipe  210  and is deep inserted into the fixing pipe  210  or externally protruded. Accordingly, the length of the arrow track  200  is controlled. 
         [0075]    As described above, the arrow track  200  in which the control pipe  220  slides within the fixing pipe  210  forward and backward is provided in order to increase or decrease the tension of the bowstring  400  engaged with the crossbow  1 . 
         [0076]    Furthermore, range control divisions  226  in which the range of the crossbow  1  according to the tension of the bowstring  400  are marked by divisions may be formed on one side or both sides of the control pipe  220  of the arrow track  200 . 
         [0077]    Accordingly, a user who uses the crossbow  1  may control the tension of the bowstring  400  by moving the position of the control pipe  220  while checking the range control divisions  226  with the naked eye. 
         [0078]    In this case, the pair of front rollers  222  is coupled with the end of the control pipe  220  between roller coupling plates  223  combined in a “E” shape and is extended in the respective strings of the bowstring  400 . 
         [0079]    Furthermore, a guide ring  225  is combined with the front part of the roller coupling plates  223  on the upper side of the roller coupling plates  223 . A loading ring  224  having a hook shape is combined with the lower part of the roller coupling plates  223 . 
         [0080]    A latching hole  310  is formed in the projectile  300  so that the projectile  300  is engaged with the latch protrusion  120  of the body  100 . The bowstring  400  is connected to the front of the projectile  300 , and a latching strap  320  is formed at the back of the projectile  300 . 
         [0081]    In this case, when the bowstring  400  is connected to the projectile  300 , the bowstring  400  is connected to the projectile  300  in the state in which the bowstring  400  formed of two strings becomes vertical (refer to  FIG. 4 ). 
         [0082]    The latching strap  320  is a strap engaged with a latching hook  611  formed in the arrowhead  610  of an arrow  600 . 
         [0083]    Furthermore, a loading plate  104  is formed at the top of the body  100  so that the arrow  600  is fixed at the top of the body  100 . 
         [0084]    That is, the loading plate  104  is combined with the top of the body  100  in the rear of the body  100 . An insertion hole  103  is formed in the loading plate  104  so that the arrow shaft  620  of the arrow  600  is inserted into the insertion hole  103 . 
         [0085]    In the crossbow  1 , the bowstring  400  functions as a medium for firing the arrow  600 . 
         [0086]    Such a bowstring  400  is made of rubber materials having high elasticity. The end of one side of the bowstring  400  is connected to the projectile  300 , and the other side of the bowstring  400  is fixed to the fixing rollers  160  of the body  100  through the front rollers  222  of the arrow track  200 . 
         [0087]    That is, when a user forward pulls the control pipe  220  of the arrow track  200 , the bowstring  400  is extended along the control pipe  220 , thus having increased elasticity. On the contrary to this, the control pipe  220  of the arrow track  200  slides into the fixing pipe  210  at the back of the control pipe  220  and is inserted therein, thus having reduced elasticity. 
         [0088]    Meanwhile, a protection plate  130  formed to bend toward the top of the body  100  is combined with one side of the side of the body  100 . 
         [0089]    The protection plate  130  is protection means for preventing a broken bowstring  400  from hitting a user when the bowstring  400  is used for a long time and broken. 
         [0090]    Furthermore, the protection plate  130  preferably is made of transparent acryl or glass materials, and a separate aiming point (not illustrated) may be printed on a surface of the protection plate  130 . 
         [0091]    Furthermore, a separately fabricated scope  140  is combined with one side of the lower part of the protection plate  130  so that precise aiming through the scope  140  is made possible. 
         [0092]    Furthermore, a safety device  150  is combined with the bottom of the latch protrusion  120  of the body  100 . 
         [0093]    The safety device  150  is combined with the latch protrusion  120  so that is slides within the body  100  forward and backward. Furthermore, if a user does not use the crossbow  1 , the safety device  150  is placed in a space to which the latch protrusion  120  comes down by backward pulling the safety device  150  for safety. In this case, although a user unintentionally pulls the trigger  110 , the crossbow  1  does not fire an arrow because the latch protrusion  120  clogged by the safety device  150  does not come down. 
         [0094]    Meanwhile, a cover plate  500  consisting of an upper plate  510  and a lower plate  520  is combined with the lower part of the fixing pipe  210  of the arrow track  200 . 
         [0095]    The cover plate  500  is provided in order for a user to hold the crossbow  1  more safely. 
         [0096]    The lower plate  520  and the upper plate  510  are hinged and combined with each other using hinges (not illustrated) formed on one sides of the lower and upper plates. The other sides of the lower and upper plates are combined with each other using locking devices (not illustrated) capable of fixing the lower plate  520  and the upper plate  510 . 
         [0097]    That is, when the bowstring  400  is replaced, the lower plate  520  is separated from the upper plate  510  by releasing the hinges and the locking devices, and the bowstring  400  combined with the fixing rollers  160  is disassembled by opening the lower plate  520 . 
         [0098]    In this case, a coupling pin  700  having both sides separated is coupled to the center of the fixing rollers  160  and the front rollers  222 . 
         [0099]    The coupling pin  700  functions to more facilitate the disassembly and assembly of the fixing rollers  160  and the front rollers  222 , and it may be disassembled and assembled through a spiral coupling method. 
         [0100]    Furthermore, the coupling pin  700  includes a part, that is, a nut part, on one side and a part, that is, a bolt part, on the other side. The nut and bolt parts of the coupling pin  700  are combined with each other. 
         [0101]    Furthermore, if the bowstring  400  is broken while a user uses the crossbow  1 , the bowstring  400  may be easily replaced by separating the fixing rollers  160  and the front rollers  222  using the coupling pin  700 . Furthermore, when the bowstring  400  is replaced, the projectile  300  is also replaced. 
         [0102]    Meanwhile, the bowstring  400  is divided into a first part A, a second part B, and a third part C as illustrated in  FIG. 4 . 
         [0103]    The first part A is a part combined with the fixing rollers  160 , the second part B is a part extended on the front rollers  222 , and the third part C is a part combined with the projectile  300 . 
         [0104]    If the bowstring  400  is used for a long time, the bowstring  400  may be broken. 
         [0105]    In this case, if the broken portion of the bowstring  400  is distant from the body  100 , a safety accident may occur because the broken portion bounces back to a user. Accordingly, the bowstring  400  is fabricated so that the first part A of the bowstring  400 , that is, a part closest to the crossbow  1 , is broken. 
         [0106]    That is, the areas of the first part A, the second part B, and the third part C when the first, the second, and the third parts are cut in a vertical plane in the lengthwise direction of the bowstring  400  are fabricated to be different. 
         [0107]    In this case, the bowstring  400  preferably has a smaller area from the first part A to the third part C. 
         [0108]    Accordingly, the bowstring  400  is fabricated so that the first part A having the smallest area and a thin thickness is more easily broken than the second part B and the third part C. As a result, the bowstring  400  bounces forward without bouncing back to a user&#39;s body, that is, to the rear of the body  100 . 
         [0109]      FIGS. 5 and 6  are state diagrams illustrating the state in which the improved crossbow in accordance with the first preferred embodiment of the present invention is used. 
         [0110]    The state in which the crossbow according to the present invention is used is described below with reference to  FIGS. 5 and 6 . 
         [0111]    First,  FIG. 5  illustrates the state in which the bowstring  400  of the crossbow  1  has been pulled. It is not easy for a user to directly pull the bowstring  400  of the crossbow  1  due to elasticity. For this reason, a user pushes the control pipe  220  of the crossbow  1  into the fixing pipe  210  to the maximum extent and then combines the projectile  300  of the crossbow  1  with the latch protrusion  120  of the body  100 . 
         [0112]    Furthermore, the loading ring  224  combined with the front of the control pipe  220  of the arrow track  200  is hung on a bough or a pipe on the roadside. 
         [0113]    Furthermore, a user pulls the body  100  backward while holding the handle  105  at the lower part of the body  100  using one hand and also holding the cover plate  500  using the other hand. 
         [0114]    Accordingly, the bowstring  400  is extended, thereby generating tension. 
         [0115]    At this time, as the elastic protrusions  240  are inserted into the fixing holes  250 , the control pipe  220  is fixed to the fixing pipe  210 . 
         [0116]    Furthermore,  FIG. 6  illustrates the state in which the arrow  600  is loaded on the crossbow  1  in which tension has been generated in the bowstring  400 . 
         [0117]    The projectile  300  is combined with the latch protrusion  120  and fixed to the top of the body  100 . Furthermore, the latching strap  320  formed in the projectile  300  is hung on the latching hook  611  formed in the arrowhead  610  of the arrow  600 . 
         [0118]    At the same time, the arrow shaft  620  of the arrow  600 , that is, the end of the rear of the arrow shaft  620 , is inserted into the insertion hole  103  of the loading plate  104  formed at the top of the body  100  so that the arrow  600  is seated in the top of the body  100  of the crossbow  1  and loaded thereon. 
         [0119]      FIGS. 7 and 8  are diagrams illustrating the state in which the arrow of the improved crossbow in accordance with the first preferred embodiment of the present invention is fired. 
         [0120]    In order for the crossbow  1  to perform firing, a user takes aim at a target at the front through the scope  140  combined with the body  100  of the crossbow  1 . 
         [0121]    As illustrated in  FIG. 7 , when the user pulls the trigger  110  backward around the trigger  110  combined with the lower part of the body  100 , the trigger  110  rotatably moves around the hinge shaft  112  of the trigger  110  downward. 
         [0122]    As illustrated in  FIG. 8 , the trigger  110  that rotatably moves downward functions to downward move the latch protrusion  120  combined with the coupling rings  111 . 
         [0123]    When the latch protrusion  120  moves downward by the operation of the trigger  110 , the projectile  300  hung on the top of the latch protrusion  120  bounds forward through the tension of the bowstring  400  because the latching of the latch protrusion  120  has been released. At that time, the arrow  600  is fired forward because the latching strap  320  of the projectile  300  pulls the latching hook  611 . 
         [0124]      FIG. 9  is a diagram illustrating the state in which a user has backward pulled the safety device  150  combined with one side of the lower part of the body  100  of the crossbow  1  when the crossbow  1  is not used. 
         [0125]    That is, the safety device  150  slides backward within the body  100  and moves to the space to which the latch protrusion  120  comes down. 
         [0126]    Accordingly, although a user unintentionally pulls the trigger  110 , the crossbow  1  does not perform firing because the latch protrusion  120  clogged by the safety device  150  does not come down. 
         [0127]      FIG. 10  is a diagram illustrating the state in which the arrow  600  has been fully fired from the crossbow  1 . 
         [0128]    As illustrated in  FIG. 10 , the projectile  300  that bounces forward is hung on the guide ring  225  combined with the front of the control pipe  220  of the arrow track  200 , thus not leaning to a downward direction. 
         [0129]    That is, the guide ring  225  functions to prevent the latching strap  320  and the latching hook  611  from being downward rolled up in front of the roller coupling plates  223  due to the tension of the bowstring  400  although the latching strap  320  and the latching hook  611  are not separated when the projectile  300  bounces forward. The guide ring  225  guides the projectile  300  so that it continues to bounce toward the front of the roller coupling plates  223 . 
         [0130]    Accordingly, the latching strap  320  and the latching hook  611  are separated, and thus the arrow  600  flies toward a target aimed by a user. 
         [0131]      FIG. 12  is an exploded perspective view illustrating an improved crossbow in accordance with a second preferred embodiment of the present invention.  FIG. 13  is a perspective view illustrating the bowstring of the improved crossbow in accordance with the second preferred embodiment of the present invention. 
         [0132]    Referring to  FIGS. 12 and 13 , the improved crossbow according to the second embodiment of the present invention is a crossbow in which a single front roller  222  is configured because the bowstring  400  is horizontally combined with the projectile  300  (refer to  FIG. 13 ) when the bowstring  400  including two strings is combined with the projectile  300 . 
         [0133]    Furthermore, both the two strings of the bowstring  400  are extended on the front roller  222 . 
         [0134]    The remaining elements and operating states are the same as those of the first embodiment, and thus a detailed description thereof is omitted. 
         [0135]    Those skilled in the art to which the present invention pertains will understand that the present invention may be implemented in other detailed forms without changing the technical spirit or indispensable characteristics of the present invention. Accordingly, it will be understood that the aforementioned embodiments are illustrative and not limitative from all aspects. The scope of the present invention is defined by the appended claims rather than the detailed description, and the present invention should be construed as covering all modifications or variations derived from the meaning and scope of the appended claims and their equivalents.