Abstract:
A fixing mechanism includes a mounting plate of a small arm accessory, a fixing member and an adjusting member. The mounting plate has a surface that faces the small arm when the mounting plate is fixed to the small arm. A first direction is defined as normal to the surface. The fixing member extends from the surface of the mounting plate in the first direction. The fixing member includes an aperture defined therein having an axis that defines a second direction different from the first direction. The adjusting member provides a fixing force to fix the small arm accessory to the small arm when inserted into the aperture of the fixing member.

Description:
BACKGROUND 
       [0001]    The present disclosure relates to a dot sighting device for use in a small arm such as a handgun, a pistol, or a rifle, and more particularly, to a dot sight device for use in a small arm with a fixing mechanism conveniently attachable to or detachable from a small arm. 
         [0002]    In recent years, dot sight devices have been employed in small arms. Using the dot sight device, since a user can aim at a target by simply causing a dot reticle image reflected from a reflective mirror to be aligned with the target, a time required to aim at the target is reduced, and it is possible to cope with an urgent situation rapidly. 
         [0003]      FIG. 1  is a diagram illustrating a fixing mechanism of a dot sight device for use in a small arm according to a related art. In the fixing mechanism, a fixing protrusion  12  is formed on the bottom of a fixing plate  11 , and the fixing protrusion  12  is fixed to a fixing groove  21  having a trapezoidal cross section formed on the rear end of a slide  20  of a small arm in a dovetail manner. 
         [0004]    A housing  30  is arranged on the fixing plate  11  and screw-coupled with the fixing plate  11  engaged with the fixing groove  21  through a screw  7 . As the screw  7  is fastened downwards, the fixing protrusion  12  is pushed upwards, so that the dot sight device is firmly fixed to the small arm. 
         [0005]    In the fixing mechanism illustrated in  FIG. 1 , since the screw  7  is vertically inserted to couple the housing  30  with the slide  20 , there is a limitation to the layout for arranging a battery, an electronic circuit substrate, a dot reticle image generating unit, and an adjusting knob, and the like which are arranged in the housing  30 , and the size of the dot sight device increases as well. 
         [0006]    Further, in the fixing mechanism illustrated in  FIG. 1 , when the dot sight device is configured with a plurality of plates which are vertically stacked, since an upper plate is coupled with a lower plate after the lower plate is fixed to the slide in a state in which the upper plate is removed, an assembly process is complicated. 
         [0007]    Furthermore, the fixing protrusion  12  is integrally formed on the lower plate of the dot sight device. However, since the size of the fixing groove  21  formed on the rear end of the slide differs according to a type of small arm, there is a problem in that types of applicable small arms are limited, and compatibility is low. 
       BRIEF SUMMARY 
       [0008]    In an embodiment, a fixing mechanism includes a mounting plate of a small arm accessory, a fixing member and an adjusting member. The mounting plate has a surface that faces the small arm when the mounting plate is fixed to the small arm. A first direction is defined as normal to the surface. The fixing member extends from the surface of the mounting plate in the first direction. The fixing member includes an aperture defined therein having an axis that defines a second direction different from the first direction. The adjusting member provides a fixing force to fix the small arm accessory to the small arm when inserted into the aperture of the fixing member. 
         [0009]    The fixing member may expand when the adjusting member is inserted into the aperture. 
         [0010]    The aperture may reduce in size in the second direction thereby causing the fixing member to expand when the adjusting member is inserted into the aperture. 
         [0011]    The adjusting member may increase in size along its length thereby causing the fixing member to expand when the adjusting member is inserted into the aperture. 
         [0012]    The cross-section of the fixing member may be trapezoidal. 
         [0013]    The fixing mechanism may include a second adjusting member. 
         [0014]    The aperture of the fixing member may be a through hole. The second adjusting member may insert into the through hole at an opposite side from the adjusting member to provide a fixing force to fix the small arm accessory to the small arm. 
         [0015]    The fixing member may include a second aperture defined therein at a side opposing the first aperture and having an axis in the second direction. The second adjusting member may insert into the second aperture of the fixing member to provide a fixing force to fix the small arm accessory to the small arm. 
         [0016]    The mounting plate may include a protrusion extending in the first direction. The protrusion may include a through hole having an axis in the second direction. The fixing member may be distinct from the mounting plate. The adjusting member may insert through the through-hole of the protrusion and into the aperture of the fixing member. 
         [0017]    The fixing member may include a plurality of grooves along an exterior surface thereby defining a plurality of contact plates. 
         [0018]    At least one of the contact plates may come into contact with the small arm when a lateral force is applied to the adjusting member. 
         [0019]    The fixing mechanism may include a pivot shaft and a pivot plate. The fixing member may include a second aperture defined therein having an axis in the first direction. The pivot shaft and the pivot plate may be disposed in the second aperture. The adjusting member may the pivot plate to rotate about the pivot shaft inserted into the aperture of the fixing member. 
         [0020]    The aperture of the fixing member may be threaded. 
         [0021]    The small arm accessory may be a dot sighting device. 
         [0022]    The first and second directions may be orthogonal. 
         [0023]    In another embodiment, a small arm accessory system includes a small arm and a small arm accessory. The small arm includes a barrel and a mounting groove defined in the small arm. A central axis of the barrel defines a first direction. A second direction is defined as orthogonal to the first direction. A major axis of the mounting groove is oriented in a third direction different from the first and second directions. The small arm accessory includes a mounting plate, a fixing member and an adjusting member. The mounting plate includes a surface that faces the small arm when the mounting plate is fixed to the small arm. The fixing member extends from the surface of the mounting plate in the second direction. The fixing member includes an aperture defined therein having an axis in the third direction. The adjusting member provides a fixing force to fix the small arm accessory to the small arm when inserted into the aperture of the fixing member. 
         [0024]    A cross-sectional shape of the fixing member may be complimentary to and smaller than a cross-sectional shape of the mounting groove. 
         [0025]    The cross-sectional shape may be trapezoidal. 
         [0026]    The fixing member may expand when the adjusting member is inserted into the aperture. 
         [0027]    The mounting plate may include a protrusion extending in the second direction. The protrusion may include a through hole having an axis in the third direction. The fixing member may be distinct from the mounting plate. The adjusting member may insert through the through-hole of the protrusion and into the aperture of the fixing member. 
         [0028]    The fixing member may include a plurality of grooves along an exterior surface thereby defining a plurality of contact plates. At least one of the contact plates may come into contact with the small arm when a lateral force is applied to the adjusting member. 
         [0029]    The small arm accessory may include includes a pivot shaft and a pivot plate. The fixing member may include a second aperture defined therein having an axis in the first direction. The pivot shaft and the pivot plate may be disposed in the second aperture. The adjusting member may cause the pivot plate to rotate about the pivot shaft inserted into the aperture of the fixing member. 
         [0030]    In another embodiment, a method for fixing a small arm accessory to a small arm includes: providing a small arm having a mounting groove extending in a lateral direction; providing a small arm accessory having a fixing member that slides in the mounting grove of the small arm, the fixing member having an aperture defined therein in the lateral direction; sliding the fixing member in the mounting groove; inserting, laterally, an adjusting member into the aperture; applying a lateral force to the adjusting member to fix the small arm accessory to the small arm. 
         [0031]    The adjusting member may be threaded and the lateral force may be applied by rotating the adjusting member to drive the adjusting member inward in the lateral direction. 
         [0032]    The fixing member may expand when the lateral force is applied. 
         [0033]    The mounting plate may include a protrusion having a through hole with an axis in the lateral direction. The fixing member may be distinct from the mounting plate. The adjusting member may be inserted through the through-hole of the protrusion and into the aperture of the fixing member. 
         [0034]    The fixing member may include a plurality of grooves along an exterior surface thereby defining a plurality of contact plates. Applying the lateral force may cause at least one of the contact plates to come into contact with the mounting groove of the small arm. 
         [0035]    The small arm accessory may include a pivot shaft and a pivot plate. The fixing member may include a second aperture defined therein having an axis orthogonal to the lateral direction. The pivot shaft and the pivot plate are disposed in the second aperture. The applying the lateral force may cause the pivot plate to rotate about the pivot shaft. 
         [0036]    A width of the pivot plate may be less than a width of the aperture and greater than a width of the mounting groove. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0037]      FIG. 1  is a diagram illustrating a fixing mechanism of a dot sight device for use in a small arm according to a related art; 
           [0038]      FIG. 2  is a diagram illustrating a dot sight device for use in a small arm with a fixing mechanism according to an embodiment of the present disclosure; 
           [0039]      FIG. 3  is a perspective view illustrating a fixing mechanism according to a first embodiment of the present disclosure; 
           [0040]      FIG. 4  is an exploded perspective view illustrating the fixing mechanism according to the first embodiment of the present disclosure; 
           [0041]      FIG. 5  is a plane view illustrating the fixing mechanism according to the first embodiment of the present disclosure; 
           [0042]      FIG. 6  is a cross-sectional view illustrating the fixing mechanism according to the first embodiment of the present disclosure; 
           [0043]      FIGS. 7 and 8  are cross sectional views of fixing a dot sight device to a small arm through the fixing mechanism according to the first embodiment of the present disclosure; 
           [0044]      FIG. 9  is a perspective view illustrating a modification of the fixing member according to the first embodiment of the present disclosure; 
           [0045]      FIG. 10  is a perspective view illustrating a dot sight device for use in a small arm with a fixing mechanism according to a second embodiment of the present disclosure; 
           [0046]      FIG. 11  is an exploded perspective view illustrating the dot sight device for use in a small arm with a fixing mechanism according to the second embodiment of the present disclosure; and 
           [0047]      FIG. 12  is a cross sectional view illustrating a state in which the dot sight device for use in a small arm with the fixing mechanism according to the second embodiment of the present disclosure is fixed. 
       
    
    
     DETAILED DESCRIPTION 
       [0048]    It is desirable to provide a dot sight device for use in a small arm with a fixing mechanism conveniently attachable to or detachable from a small arm. It is also desirable to provide a compact dot sight device for use in a small arm with a compact side fixing mechanism. 
         [0049]    It is also desirable to provide a dot sight device for use in a small arm which is compatible with various types of small arms having different sizes of fixing grooves. 
         [0050]    According to the exemplary embodiments, it is possible to provide a dot sight device for use in a small arm with a fixing mechanism conveniently attachable to or detachable from a small arm. Further, it is possible to provide a compact dot sight device for use in a small arm with a compact fixing mechanism in which a fixing screw is laterally inserted into a fixing groove. 
         [0051]    Furthermore, it is possible to provide a dot sight device for use in a small arm which is compatible with various types of small arms having different sizes of fixing grooves. 
         [0052]    Hereinafter, exemplary embodiment of the present disclosure will be described in detail with reference to the appended drawings. 
         [0053]    First, a dot sight device for use in a small arm with a fixing mechanism according to a first embodiment of the present invention will be described in detail with reference to the appended drawings. 
         [0054]      FIG. 2  is a diagram illustrating a dot sight device for use in a small arm with a fixing mechanism according to an embodiment of the present disclosure. A dot sight device according to the present disclosure includes a light-emitting device (LED or a laser diode (LD)) configured to emit light as a light source, a reflector configured to reflect beams emitted from the light-emitting device toward an observer (user), and a fixing mechanism configured to provide a structure easily attachable to or detachable from a small arm such as a handgun, a pistol, or a rifle. The dot sight device further includes an upper plate (not shown) and a lower plate  120 . Further, a battery, an electronic circuit substrate, and the like are arranged between the upper plate and the lower plate  120 . Generally, the reflector is arranged on the upper plate, and the fixing mechanism is arranged on the lower plate. The following description will proceed with the example in which the fixing mechanism is arranged on the lower plate. However, the present disclosure is not limited to the example in which the fixing mechanism is arranged on the lower plate. 
         [0055]      FIG. 3  is a perspective view illustrating the fixing mechanism according to the first embodiment of the present embodiment, and  FIG. 4  is an exploded perspective view illustrating the fixing mechanism according to the first embodiment of the present embodiment. The fixing mechanism of the present disclosure includes a fixing protrusion  121 , an accommodation groove  122 , a fixing member  130 , and an adjusting member  140 . The fixing protrusion  121  may be formed integrally with the lower plate  120  of the dot sight device. The fixing protrusion  121  includes a coupling hole  123  that may have a female screw or an internal thread. The fixing protrusion  121  may have a cross section corresponding to that of the fixing member  130 . In this example, the fixing protrusion  121  may have a trapezoidal cross section. The accommodation groove  122  is formed on the lower plate  120  of the dot sight device between both ends the fixing protrusion  121  in the form of a recess. The accommodation groove  122  is provided in a form in which fixing members  130  of various shapes or sizes can be accommodated. The accommodation groove  122  has an internal circumferential surface that is obliquely formed so that the fixing member  130  can expand or contract. The fixing member  130  has a shape corresponding to a fixing groove  111  (see  FIG. 6 ) formed in a small arm slide  110 . In this example, the fixing member  130  has a bar shape having a trapezoidal cross section. The fixing member  130  includes an insertion hole  131  and a slot  132 . The fixing member  130  is placed on the accommodation groove  122  between both ends of the fixing protrusion  121 . The fixing member  130  is made of an expansible or contractible material. The fixing member  130  is expansible or contractible. In other words, as the adjusting member  140  is inserted toward the center of the insertion hole  131  of the fixing member  130  through the coupling hole  123  in a state in which the fixing member  130  is paced on the accommodation groove  122 , the width of the slot  132  gradually increases, and thus the fixing member  130 , that is, the insertion hole  131  gradually expands. Further, as the adjusting member  140  moves back from the center of the insertion hole  131  of the fixing member  130 , the width of the slot  132  gradually decreases, and thus the fixing member  130 , that is, the insertion hole  131  gradually contracts. A plurality of fixing members  130  having different sizes may be prepared to support various kinds of small arms. In other words, a plurality of fixing members  130  having various sizes can be prepared, and among the plurality of fixing members  130 , the fixing member  130  corresponding to the size of the fixing groove  111  (see  FIG. 6 ) can be selected and used. The adjusting member  140  includes a leading end  141 , a body portion  143 , and a head portion  142 . The leading end  141  is formed such that the diameter thereof gradually increases toward the body portion  143 . Thus, as the adjusting member  140  is inserted toward the center of the fixing member  130 , the leading end  141  provides the fixing member  130  with expansion force causing the fixing member  130  to expand. The diameter of the tip of the leading end  141  may be smaller than the diameter of the insertion hole  131  in the contracted state, and the diameter of the portion of the leading end  141  near the body portion  143 , that is, the diameter of the body portion  143  is larger than the diameter of the insertion hole  131  in the contracted state. For example, the leading end  141  can have various shapes such as a conical shape, a conical shape having a rounded tip, a poly prism shape, a poly prism shape having a rounded tip, or the like. The body portion  143  has a male screw or an external thread on an outer circumferential surface thereof, corresponding to the female screw of the coupling hole  123 . The adjusting member  140  is screw-coupled with the fixing protrusion  121  when the dot sight device is fixed to the small arm. The head portion  142  is formed on the head of the adjusting member  140 . The head portion  142  is used to rotate the adjusting member  140  and fasten or release the adjusting member  140  using, for example, a screw driver. To this end, the head portion  142  has a slot, a groove, or a recess corresponding to a tip of a tool used to turn the adjusting member  140  such as a screwdriver. The head portion  142  can have slots, grooves, or recesses of various forms such as a straight line form, a cross from, or a polygonal from. In this example, the head portion  142  has a slot of a straight line. In this example, the two adjusting members  142  are provided, and laterally inserted into the insertion holes  132  while providing the fixing member  130  with expansion force from both sides. However, the present disclosure is not limited to this example, and the number of adjusting members  142  may be one or three or more. For example, a single adjusting member  142  may be provided as long as expansion force enough to stably fix the dot sight device to the small arm is provided. The fixing mechanism fixes the dot sight device  120  to the small arm slide  110  such that the fixing protrusion  121  is coupled with the fixing member  130  using the adjusting members  140 , and the fixing member  130  is coupled with the fixing groove  111  (see  FIG. 6 ) in the dovetail manner. 
         [0056]    Next, a process of fixing the dot sight device to the small arm through the fixing mechanism according to the first embodiment of the present disclosure will be described with reference to  FIGS. 5 to 8 . 
         [0057]      FIG. 5  is a plane view illustrating the fixing mechanism according to the first embodiment of the present disclosure,  FIG. 6  is a cross-sectional view illustrating the fixing mechanism according to the first embodiment of the present disclosure, and  FIGS. 7 and 8  are explanatory views for describing the process of fixing the dot sight device to the small arm through the fixing mechanism according to the first embodiment of the present disclosure. 
         [0058]    As illustrated in  FIGS. 5 and 6 , first, a fixing member  130  corresponding to a desired small arm is selected among a plurality of fixing members  130  which are prepared in advance, and placed on the accommodation groove  122  between both ends of the fixing protrusion  121  so that the coupling hole  123  is aligned with the insertion hole  131 . 
         [0059]    The two adjusting members  140  are inserted into the insertion hole  131  of the fixing member  130  while screw-coupling with the coupling holes  123 , and thus the fixing member  130  is assembled with the lower plate  120  of the dot sight device through the fixing protrusion  121 . 
         [0060]    In a state in which the adjusting member  140  does not provide expansion force to the fixing member  130 , the fixing member  130  is coupled with the fixing groove  111  of the small arm slide  110  of the small arm in the dovetail manner. Then, as illustrated in  FIGS. 7 and 8 , when the two adjusting members  140  are further fastened to move forward the center of the fixing member  130  from both sides of the fixing protrusion  121  in this state, the leading ends  141  of the two adjusting members  140  push the inner walls of the insertion holes  131 , and thus expansion force is applied to the fixing member  130  in a direction perpendicular to a longitudinal direction of the fixing member since the slot  132  is formed in the fixing member  130 . As the fixing member  130  expands centering on the slot  132 , the outer surface of the fixing member  130  pushes the inner surface of the fixing groove  111  of the small arm slide  110 , so that the dot sight device is firmly fixed to the small arm. 
         [0061]    More specifically, when the adjusting members  140  are rotated and fastened in the state in which the leading ends  141  of the adjusting members  140  are laterally inserted into the insertion hole  131  of the fixing member  130 , the leading ends  141  of the adjusting members  140  move forward in the insertion hole  131  while coming into point contact or line contact with the inner surface of the insertion hole  131 , and thus the fixing member  130  expands centering on the slot  132  to push the inner walls of the fixing groove  111  and comes into close contact with the fixing groove  111 . Accordingly, the dot sight device may be firmly fixed to the small arm. 
         [0062]    Here, as illustrated in  FIG. 7 , at least one of both ends of the insertion hole  131  may have a shape corresponding to the shape of the leading end of the leading end  141  of the adjusting member  140 . In other words, at least one of both ends of the insertion hole  131  may have the diameter that gradually decreases toward the inside thereof. However, the present disclosure is not limited to this example. For example, both ends of the insertion hole  131  may have a shape having a constant diameter. 
         [0063]    When both ends of the insertion hole  131  have the diameter that gradually decreases toward the inside thereof corresponding to the leading end  141  of the adjusting member  140 , the leading end  141  of the adjusting member  140  comes into surface contact with the insertion hole  131  of the fixing member  130 , the leading end  141  uniformly pushes the inner surface of the insertion hole  131  by the leading end  141 , and thus expansion force of the fixing member  130  is uniformly applied to the inner wall of the fixing groove  111 . 
         [0064]    At this time, since the fixing member  130  has a shape corresponding to the fixing groove  111  as illustrated in  FIG. 8 , as the fixing member  130  expands as indicated by arrows in the state in which the fixing member  130  is fitted into the fixing groove  111 , both the outer walls of the fixing member  130  come into close contact with both inner walls of the fixing groove  111 , and the bottom surface of the fixing member  130  come into close contact with the bottom surface of the fixing groove  111 . 
         [0065]    In other words, since the fixing member  130  pushes the inner walls and the bottom surface of the fixing groove  111  while coming into close contact with the fixing groove  111  as indicated by arrows in  FIG. 8 , the dot sight device may be firmly fixed to the small arm. 
         [0066]    In addition, since the fixing member  130  is coupled with the fixing protrusion  121  through the adjusting member  140 , force of the fixing member  130  pushing the bottom surface of the fixing groove  111  is transferred to the lower plate  120 , that is, the dot sight device, and thus fixing force between the lower plate  120  of the dot sight device  120  and the small arm slide  110  increases. 
         [0067]    Meanwhile, the dot sight device can be conveniently detached from the small arm by simply rotating and loosening the adjusting member  140 . Specifically, as the adjusting member  140  is rotated and loosened, the leading end  141  of the adjusting member  140  moves back from the insertion hole  131 , the fixing member  130  contracts, and thus the outer walls of the fixing member  130  come apart from the inner walls of the fixing groove  111 . Then, since no fixing force is applied between the fixing member  130  and the fixing groove  111 , the user can easily take the dot sight device from the fixing groove  111  of the small arm while pulling or pushing the dot sight device in the longitudinal direction of the fixing groove  111 . 
         [0068]    In addition, since the fixing member  130  can be selected from the plurality of fixing members  130  having the different sizes, the fixing mechanism according to the present disclosure is compatible with various forms of small arms. 
         [0069]      FIG. 9  is a perspective view illustrating a modification of the fixing member  130 . Referring to  FIG. 9 , the fixing member  130  includes concave-convex portions  133  which are formed in the form of a groove or a protrusion extending in the direction perpendicular to the longitudinal direction of the fixing member  130  on the outer circumferential surface of the fixing member  130 . The concave-convex portions (for example, a groove or ridge)  133  serve to increase friction force between the fixing member  130  and the fixing groove  111 . In other words, since the concave-convex portions  133  are formed in the direction perpendicular to the moving direction of the fixing member  130 , frictional force making it difficult for the fixing member  130  to move in the longitudinal direction of the fixing member  130  increases in a state in which the fixing member  130  expands toward the inner wall of the fixing groove  111  and comes into close contact with the fixing groove  111 . Thus, sufficient fixing force may be provided although the adjusting member  140  is not excessively fastened. As described above, according to the first embodiment of the present disclosure, it is possible to conveniently attach or detach the dot sight device to or from the small arm, the dot sight device is compatible with various forms of small arms, and the compact dot sight device can be provided due to the side fixing mechanism. 
         [0070]    Next, a dot sight device for use in a small arm with a fixing mechanism according to a second embodiment of the present disclosure will be described. 
         [0071]      FIG. 10  is a perspective view illustrating the dot sight device for use in a small arm with a fixing mechanism according to the second embodiment of the present disclosure,  FIG. 11  is an exploded perspective view illustrating the dot sight device for use in a small arm with a fixing mechanism according to the second embodiment of the present disclosure, and  FIG. 12  is a cross sectional view illustrating a state in which the dot sight device for use in a small arm with a fixing mechanism according to the second embodiment of the present disclosure is fixed. 
         [0072]    The difference with the dot sight device for use in a small arm with a fixing mechanism according to the second embodiment of the present disclosure lies in that a fixing member  130 ′ is rotated as the adjusting member  140  is fastened and selectively comes into contact with both inner walls of the fixing groove  111 , and an aperture  136  formed in the fixing protrusion  121 . Description of structure that is common with the first embodiment is omitted for brevity. 
         [0073]    The fixing member  130 ′ includes a shaft  135  which is vertically coupled with the accommodation groove  122  and a pivot plate  134  which is placed on the accommodation groove  122  to pivot on the shaft  135 . The shaft  135  may be provided by a screw secured to a screw formed in the fixing member  130 ′ near a center of the aperture  136 . The pivot plate  134  is coupled to the lower plate  120  of the dot sight device as the shaft  135  is screw-coupled with the lower plate  120 . Further, the fixing protrusion  121  includes the aperture  136  defined therein. When the pivot plate  134  is pushed and rotated by the adjusting member  141 , the aperture  136  serves to allow the fixing member  130 ′ to come into contact with the fixing groove  111 . The pivot plate  134  may be smaller than an opening of the aperture  136  to allow insertion into the aperture  136  and also larger than a width the fixing groove  111 . Thus, when the pivot plate  134  is rotated about the shaft  135 , the pivot plate comes into contact with the fixing groove  111  providing an interference fit. The pivot plate  134  has a trapezoidal shape, and the accommodation groove  122  has a conical shape corresponding to the trapezoidal shape of the pivot plate  134 . But, the present disclosure is not limited to this example, and for example, the pivot plate  134  may have a rectangular shape, and the accommodation groove  122  may have a cylindrical shape corresponding to the rectangular shape of the pivot plate  134 . 
         [0074]    Specifically, as illustrated in  FIG. 12 , the fixing member  130 ′ is placed on the accommodation groove  122  and coupled to the lower plate  120  by the shaft  135 . Then, the dot sight device is fitted into the small arm slide in the dovetail manner. In this state, the adjusting member  140  is fastened to move forward, and pushes the fixing member  130 ′. The pivot plate  134  of the fixing member  130  pivots and comes into contact with the inner walls the fixing groove  111  through the aperture  136 . Thus, the dot sight device is firmly fixed to the small arm. 
         [0075]    As described above, according to the second embodiment of the present disclosure, it is possible to conveniently attach or detach the dot sight device to or from the small arm, the dot sight device is compatible with various forms of small arms, and the compact dot sight device having the side fixing mechanism can be provided. 
         [0076]    While various embodiments of the disclosure have been described and illustrated above, it should be understood that these are exemplary of the invention and are not to be considered as limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the spirit or scope of the present invention. 
         [0077]    For example, in the structure illustrated in  FIG. 4 , the fixing member  130  may not be provided, and instead, the fixing protrusion  121  may have the function of the fixing member  130 . Specifically, the fixing protrusion  121  may include a slot corresponding to the slot  132  of the fixing member  130 , and an internal hole having the functions of both the coupling hole  123  and the insertion hole  131 . In this case, as the adjusting members  140  are fastened and screw-coupled in a state in which the fixing protrusion  121  is fitted into the fixing groove  111 , the fixing protrusion  121  expands so that the outer wall of the fixing protrusion  121  come into close contact with the inner walls of the fixing groove  111 , and thus sufficient fixing forces is provided. 
         [0078]    As another example, the fixing device may be used with other small arm accessories such as lights, optical sights, and laser sights. 
         [0079]    Accordingly, the invention is not to be considered as being limited by the foregoing description, and is only limited by the scope of the claims. Furthermore, the above advantages and features are provided in described embodiments, but shall not limit the application of such issued claims to processes and structures accomplishing any or all of the above advantages. 
         [0080]    Additionally, the section headings herein are provided for consistency with the suggestions under 37 C.F.R. 1.77 or otherwise to provide organizational cues. These headings shall not limit or characterize the invention(s) set out in any claims that may issue from this disclosure. Specifically and by way of example, a description of a technology in the “Background” is not to be construed as an admission that technology is prior art to any invention(s) in this disclosure. Neither is the “Summary” to be considered as a characterization of the invention(s) set forth in issued claims. Furthermore, any reference in this disclosure to “invention” in the singular should not be used to argue that there is only a single point of novelty in this disclosure. Multiple inventions may be set forth according to the limitations of the multiple claims issuing from this disclosure, and such claims accordingly define the invention(s), and their equivalents, that are protected thereby. In all instances, the scope of such claims shall be considered on their own merits in light of this disclosure, but should not be constrained by the headings set forth herein.