Patent Publication Number: US-2021162956-A1

Title: Adaptor for assembling wiper blade, wiper blade assembly, and wiper device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to and the benefit of Korean Patent Application No. 10-2019-0158549, filed on Dec. 2, 2019, the disclosure of which is incorporated herein by reference in its entirety. 
     BACKGROUND 
     1. Field of the Invention 
     The present invention relates to an adaptor for assembling a wiper blade, a wiper blade assembly, and a wiper device, and more particularly, to an adaptor for assembling a wiper blade, which is easily separated from a wiper arm while a great fastening force is secured, a wiper blade assembly, and a wiper device. 
     2. Discussion of Related Art 
     Generally, a wiper device is installed in a vehicle or the like to clean a surface of a windshield. The wiper device may include a wiper motor, a wiper arm, a wiper blade, and the like, and an adaptor may be used for a structural connection between the wiper arm and the wiper blade. 
     The wiper arm is connected to a rotational shaft of the wiper motor at a bottom end and reciprocates due to the wiper motor. One or more wiper arms are provided according to a size of the windshield. When a plurality of wiper arms are provided, they are provided not to interfere pith each other in rotation. 
     In addition, the wiper blade may be separably coupled to an end of the wiper arm through the adaptor. The wiper blade is provided in a linear shape, remains in a state of being pressed against the windshield, and slides against and wipes the surface of the windshield due to movement of the rotating wiper arm. 
     Since the wiper blade is rubbed continuously against the windshield while being installed in the vehicle, as time passes, the wiper blade may be worn, generate unnecessary noise, or decrease in performance of cleaning the surface. 
     Accordingly, it is necessary to continuously replace the wiper blade. Here, a user of the vehicle separates an existing wiper blade from the wiper arm and then fastens a new wiper blade using the adaptor. 
     However, since the wiper arm has a variety of shapes depending on a type thereof, an adaptor having a suitable shape for the wiper arm is necessary. Also, it is necessary for the adaptor to easily replace the wiper blade and to stably maintain the wiper blade fastened to the wiper arm in a state of being pressed against the windshield despite windage resistance. 
     Accordingly, in consideration of a shape of the wiper arm, a structure of the adaptor configured to effectively connect the wiper blade to the wiper arm has been developed greatly. 
     SUMMARY OF THE INVENTION 
     The present invention is provided to providing an adaptor for assembling a wiper blade, which has a convenient structure configured to firmly fasten different types of wiper arms, a wiper blade assembly, and a wiper device. 
     According to an aspect of the present invention, there is provided an adaptor for assembling a wiper blade which is configured to couple the wiper blade to two or more types of wiper arms. The adaptor includes a body portion coupled to the wiper blade and to which a first type wiper arm is coupled laterally or to which a second type wiper arm is coupled vertically and a locking portion rotatably provided on the body portion to cover a front end of the wiper arm. Here, in the body portion, a restriction protrusion protruding to face a front end of the first type wiper arm fastened to the body portion is provided on a side surface, and a groove configured to guide and hold an internal protrusion provided inside the second type wiper arm fastened to the body portion is provided in the side surface. Also, the groove is provided to be biased in a direction farther from the restriction protrusion toward an outside portion into which the internal protrusion is inserted in comparison to an inside portion where the insertion of the internal protrusion is blocked. 
     The groove may include a guide path including the outside portion into which the internal protrusion is inserted and the inside portion where the insertion of the internal protrusion is blocked and a holding path bent from the guide path and extending horizontally. 
     The guide path may be provided to be tilted toward the locking portion from the outside portion toward the inside portion, and the holding path may be bent at the guide path at an acute angle and extend horizontally. 
     In the groove, a distance between the restriction protrusion and a front end most adjacent to the locking portion may be provided to be smaller than a distance between the internal protrusion of the second type wiper arm and a front end of the second type wiper arm. 
     In the body portion, a hinge portion may be provided in front so that the locking portion rotates and an elastic leg, which is elastically protruding and being held by a rear end of the first type wiper arm, may be provided in the rear. 
     The hinge portion may include a hinge shaft fastened to the locking portion and a holding key held by an uneven portion of the locking portion depending on a rotational angle of the locking portion to restrict rotation of the locking portion. 
     When the uneven portion elastically moves due to an external pressure, the uneven portion may be separated from the holding key so that the locking portion may be allowed to rotate in a direction in which the front end of the wiper arm is exposed. 
     In the body portion, an elastic arm, which comes into contact with inner surfaces of the wiper arms having different widths and coupled to the body portion and is elastically introduced inward, may be provided on the side surface. 
     In the elastic arm, the front end adjacent to the locking portion may be provided in a form of a free end, and the front end may have a shape protruding outward. 
     The adaptor may further include a spacer portion disposed to be overlapped with the side surface of the body portion to compensate for a gap between the side surface of the body portion and a third type wiper arm having a great width in comparison to the first type wiper arm or the second type wiper arm when the third type wiper arm is fastened, and wherein an incision portion provided to mount the spacer portion is provided on the top surface of the body portion. 
     In the body portion, a through hole, into which a pin of a third type wiper arm fastened widthwise is inserted, may be provided on the side surface. 
     The spacer portion may include a pair of layer portions overlapped with both side surfaces of the body portion and a leg portion configured to connect the pair of layer portions and introduced into the incision portion, and the layer portions each have a shape with a caved portion corresponding to a through hole. 
     The adaptor may further include a cover portion which is fastened to the body portion to cover both side surfaces and a top surface of the body portion, which is provided to have a width corresponding to that of the locking portion, and which includes an opening at a part corresponding to a through hole. 
     In the body portion, a curved portion may be provided between both side surfaces to hold a third type wiper arm having a ring-shaped front end. 
     According to another aspect of the present invention, there is provided a wiper blade assembly including a wiper blade including a contact member, which is pressed against a surface of a target to be pressed against, and the adaptor according to any one of claims  1  to  14  which is fastened to the wiper blade. Here, the adaptor may further include a base portion fixed to the wiper blade, and the body portion may be fastened to the base portion to hinge-rotate. 
     The body portion may include a pair of hinge holes provided in both side surfaces, and the base portion may include a bar-shaped rotational shaft passing through the pair of hinge holes at once or a rotational shaft having a shape of a pair of protrusions which are fastened to the pair of hinge holes, respectively. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other objects, features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing exemplary embodiments thereof in detail with reference to the accompanying drawings, in which: 
         FIGS. 1 and 2  are perspective views of an adaptor according to one embodiment of the present invention; 
         FIGS. 3 and 4  are exploded-perspective views of the adaptor according to one embodiment of the present invention; 
         FIGS. 5 and 6  are partial perspective views of the adaptor according to one embodiment of the present invention; 
         FIG. 7  is a perspective view of the adaptor according to one embodiment of the present invention; 
         FIG. 8  is an exploded-perspective view of the adaptor according to one embodiment of the present invention; 
         FIGS. 9 and 10  are partial perspective views of the adaptor according to one embodiment of the present invention; and 
         FIGS. 11 to 18  are views illustrating a method of assembling a wiper blade assembly according to one embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     The aspects, particular advantages, and novel features of the present invention will become apparent from a detailed description of exemplary embodiments with reference to the attached drawings. While reference numerals are given to components of each drawing, it should be noted that although shown in different drawings, like components will be referred to as like reference numerals if possible. Also, in a description of the embodiments of the present invention, a detailed description of well-known components or functions of the related art will be omitted when it is deemed to obscure understanding of the embodiments of the present invention. 
     Also, for reference, it should be noted that tine differences which may exist between the drawings included in the specification may be construed as forming different embodiments included in the present invention. 
       FIGS. 1 and 2  are perspective views of an adaptor according to one embodiment of the present invention,  FIGS. 3 and 4  are exploded-perspective views of the adaptor according to ne embodiment of the present invention, and  FIGS. 5 and 6  are partial perspective views of the adaptor according to one embodiment of the present invention. 
     Also,  FIG. 7  is a perspective view of the adaptor according to one embodiment of the present invention,  FIG. 8  is an exploded-perspective view of the adaptor according to one embodiment of the present invention, and  FIGS. 9 and 10  are partial perspective views of the adaptor according to one embodiment of the present invention. 
     Also,  FIGS. 11 to 18  are views illustrating a method of assembling a wiper blade assembly according to one embodiment of the present invention. 
     For reference, hereinafter, for convenience, it will be described that frontward/front end means a left side in  FIG. 1  and rearward/rear end means a right side in  FIG. 1 . An outside means a far side from a target to be pressed against (a windshield and the like of a vehicle) on the basis of an adaptor  20  (an upper side in the case of  FIG. 1 ), and an inside means a close side to the target to be pressed against in the adaptor  20  (a lower side in the case of  FIG. 1 ). 
     In addition, the terms having directivity may be construed as being on the basis of the drawings. However, since the terms are merely for convenience of description, it should be noted that the right of the present invention will not be unnecessarily construed restrictively due to the terms. 
     Before describing the adaptor  20  of the present invention, a wiper device  1  and the like according to the present invention will be described first with reference to  FIG. 1  and the like. 
     The present invention includes the wiper device  1 . The wiper device  1  includes a wiper blade (not shown), a wiper arm  10 , and a wiper-blade-assembling adaptor  20  (hereinafter, referred to as the adaptor  20 ). 
     For reference, in the specification, a wiper blade assembly may mean a combination between the wiper blade and the adaptor  20 . 
     The wiper blade included in the wiper device  1  of the present invention is pressed against a surface of a target to be pressed-against and cleans the surface of the target through movement. The target to be pressed-against may be a windshield of a vehicle but is not limited thereto, and all objects to be cleaned by sliding may become targets to be pressed-against. 
     Also, the surface against which the wiper blade is pressed may be a flat surface, a curved surface, or the like, and the wiper blade may have a shape corresponding to a shape of the surface of the target. 
     The wiper blade may include a contact member (not shown), which has a V-shaped cross section, includes an elastic material, and slides along a surface of a target to be pressed-against while being pressed against the target directly, an elastic member (not shown) configured to apply an elastic force to the contact member so as to deform a contact side of the contact member to coincide with the surface of the target, a cover member (not shown) provided on an opposite side to the contact member on the basis of the elastic member, and a coupling cover (not shown) configured to be coupled to the adaptor  20 . 
     However, in the specification, since the wiper blade may be a structure including conventionally well-known components, a detailed description will be omitted below. 
     Also, the adaptor  20  of the present invention which will be described below may be fastened to the wiper blade using an unlimited variety of methods, and there is no limitation in a structure as long as it is possible to fasten the wiper blade to be rotatable on the basis of the adaptor  20 . 
     The wiper arm  10  rotates about a base end and has an end, to which the wiper blade is connected, and transmits a rotational force to the wiper blade so as to implement cleaning of the target using the wiper blade. 
     The wiper arm  10  includes an arm portion and a connection portion. In the arm portion, a driving source (motor or the like) configured to rotate the wiper arm  10  is connected to the base end directly or indirectly so that an end of the arm portion rotates due to a rotational force of the driving source while drawing an arc. 
     The arm portion may have a bar shape extending between the base end and the end and may include a metal material for durability but a material thereof is not limited thereto. Also, any one of a variety of shapes will be available as long as the shape is capable of connecting the base end to the end and may include a part bent or twisted one time or more. 
     In the arm portion, the connection portion is coupled to the end. The connection portion is a component for connecting the wiper arm  10  to the adaptor  20  and may have a shape which differs according to a type of the wiper arm  10 . 
     The adaptor  20  of the present invention may be configured to couple two or more types of such wiper arms  10  selectively. That is, in the specification, the wiper arm  10  may include two or more types. Hereinafter, a first wiper arm  10   a  to an eighth wiper arm  10   h  will be described with reference to  FIGS. 11 to 18 . 
     Referring to  FIG. 11 , the first wiper arm  10   a  includes an arm portion having a relatively small width in comparison to the adaptor  20  and includes a connection portion extending from the arm portion with the same width continuously. Here, the connection portion may form a ring shape which extends in a direction away from the arm portion while being parallel to the arm portion and is bent in a direction facing the arm portion. 
     That is, the connection portion of the first wiper arm  10   a  may include an upper part and a lower part which have linear shapes parallel to each other and a convex part configured to connect the upper part to the lower part, and an uneven part for reinforcing a fastening force to the adaptor  20  may be applied therebelow. 
     The first wiper arm  10   a  may be the wiper arm  10  which is fastened to the adaptor  20  vertically, and a detailed fastening method will be described below. 
     Referring to  FIG. 12 , in a second wiper arm  10   b,  an arm portion may have a staple-shaped cross section to have strength which braces for bending. Also, a connection portion of the second wiper arm  10   b  may extend continuously with the arm portion, have a cross section having the same shape as that of the arm portion, and include a protruding end  101   b  protruding from a base end. 
     The protruding end  101   b  extends from a front end of a top surface of the connection portion to be curved or bent and has a width smaller than that of the top surface so as to be introduced into a locking portion  22  of the adaptor  20 , Which will be described below, and be mounted on the adaptor  20 . 
     Also, an opening  103   b  may be provided in a top surface of the second wiper arm  10   b,  and an insertion piece  104   b  may be provided in the opening  103   b.  When the second wiper arm  10   b  is inserted into the adaptor  20 , the insertion piece  104   b  is introduced into a bottom of an elastic piece  2123  and engaged with the elastic piece  2123  so as to suppress an upward separation of the second wiper arm  10   b.    
     A side surface of the connection portion may be provided to be higher than a side surface of the arm portion. That is, a bottom of the side surface of the connection portion extends to be located below a bottom end of the side surface of the arm portion. Here, a side from the bottom end of the side surface of the connection portion to a rear end may form a holding end  102   b.    
     The second wiper arm  10   b  may be the wiper arm  10  fastened to the adaptor  20  horizontally. The second wiper aim  10   b  may move horizontally until a front side of the side surface of the connection portion comes into contact with a restriction protrusion  2111  provided on the adaptor  20  and may be fastened thereto. When the second wiper arm  10   b  is fastened to the adaptor  20  so that the front side of the second wiper arm  10   b  comes into contact with the restriction protrusion  2111 , the holding end  102   b  of the second wiper arm  10   b  passes over an elastic leg  214  provided on the adaptor  20  and the elastic leg  214  restricts movement of the wiper arm  10   b  in a direction of being separated. 
     It is sufficient that the holding end  102   b  has a shape which forms a step between the connection portion and the arm portion, a detailed shape or structure may be freely modified. 
     Referring to  FIG. 13 , a third wiper arm  10   c  has an arm portion similar to that of the first wiper arm  10   a  and has a connection portion having a shape similar to that of the second wiper arm  10   b.  Here, the connection portion of the third wiper arm  10   c  may include a protruding end  101   c  and a holding end  102   c.    
     The connection portion of the third wiper arm  10   c  may have a front end of a side surface different from that of the second wiper arm  10   b.  In the case of the second wiper arm  10   b,  a chamfer may be formed on the front side of the side surface. However, in the third wiper arm  10   c,  a front side of the side surface may be provided vertically. Nevertheless, an uppermost limit in horizontal movement of both of the second wiper arm  10   b  and the third wiper arm  10   c  may be set by the restriction protrusion  2111 . 
     That is, as described above, when the third wiper arm  10   c  is fastened to the adaptor  20  horizontally, movement of the front side of the third wiper arm  10   c  may be restricted by the restriction protrusion  2111  provided on the adaptor  20  and the holding end  102   c  of the third wiper arm  10   c  is held by the elastic leg  214 . 
     Accordingly, like the second wiper arm  10   b,  in the third wiper arm  10   c,  the restriction protrusion  2111  and the front side face each other in a leftward direction so as to be restricted in movement of the third wiper arm  10   c  and the holding end  102   c  is held by the elastic leg  214  in a rightward direction to be restricted in movement of the third wiper arm  10   c.    
     Referring to  FIG. 14 , a fourth wiper arm  10   d  includes an arm portion having a staple-shaped cross section with a bottom end of a side surface which is bent or curved inward and includes a connection portion extending to be biased toward one side in comparison to a longitudinal direction of the arm portion. 
     Here, an internal protrusion  101   d  bent inward may be provided at the bottom end of the side surface in the connection portion. When the fourth wiper arm  10   d  is fastened to the adaptor  20  horizontally, the internal protrusion  101   d  may be guided by a first guide path  2112   a  of the adaptor  20 . 
     An opening  102   d  may be provided in a top surface in the connection portion of the fourth wiper arm  10   d,  and an elastic protruding portion  2122  of the adaptor  20  may be mounted in the opening  102   d.    
     Also, in the fourth wiper arm  10   d,  the connection portion may have an inner width that is relatively great in comparison to those of other types of wiper arms  10 . In this case, the adaptor  20  may prevent a fastening force from decreasing due to a gap formed between the fourth wiper arm  10   d  and the adaptor  20  using a spacer portion  24 . 
     Referring to  FIG. 15 , a fifth wiper arm  10   e  may have a form similar to that of the fourth wiper arm  10   d  but has a width smaller than that of the fourth wiper arm  10   d  so that the fifth wiper arm may be fastened to the adaptor  20  without the spacer portion  24 . 
     Referring to  FIG. 16 , a sixth wiper arm  10   f  may be similar to the fourth wiper arm  10   d  or the fifth wiper arm  10   e.  However, an internal protrusion  101   f  may be provided at a certain point inward from a side surface of a connection portion. 
     Here, the internal protrusion  101   f  may move along a first guide path  2112   a  of the adaptor  20  to allow the sixth wiper arm  10   f  to be fastened. However, since the first guide path  2112   a  has a tilted shape, the sixth wiper arm  10   f  may be fastened in a direction different from that of the first wiper arm  10   a  while being fastened to the adaptor  20  in a vertical direction. This will be described below in detail. 
     Also, the sixth wiper arm  10   f  may have a recessed portion  102   f  at a front side of the side surface of the connection portion and may be used for a part on which the restriction protrusion  2111  is provided on a side surface  211  of the adaptor  20 . 
     Referring to  FIG. 17 , a seventh wiper arm  10   g  may have an arm portion having a shape with a height which is great in comparison to a width, and a connection portion extending from the arm portion may have a pin  101   g  extending from one side in a width direction. 
     Here, when the seventh wiper am  10   g  is fastened to the adaptor  20  in the width direction, the pin  101   g  may be inserted into a through hole  2113  provided in the adaptor  20 . 
     Also, in the connection portion of the seventh wiper arm  10   g,  a lid portion  102   g  on a top side may extend in the same direction as that of the pin  101   g  and be provided at a position deviating from the pin  101   g  in a front-rear direction. The lid portion  102   g  may be mounted on a top surface  212  of the adaptor  20  and be provided to have a shape bent at least one time to surround the adaptor  20 . 
     Referring to  FIG. 18 , an eighth wiper arm  10   h  has differences in cross-sectional shapes of a connection portion and an arm portion in comparison to the seventh wiper arm  10   g  but is fastened to the adaptor  20  using a pin  101   h  and a lid portion  102   h  similarly to the seventh wiper arm  10 . 
     In the case of the eighth wiper arm  10   h,  in comparison to the seventh wiper arm  10   g,  since the lid portion  102   h  has a great width, when the eighth wiper arm  10   h  is fastened to the adaptor  20 , it may be necessary to use the spacer portion  24  or a cover portion  23 , unlike when the seventh wiper arm  10   g  is fastened. 
     Hereinafter, the adaptor  20  of the present invention will be described with reference to  FIG. 1  or the like. 
     As shown in  FIGS. 1 to 10 , in the adaptor  20  according to one embodiment of the present invention, a wiper blade may be coupled to a lower side and two or more types of wiper arms  10  are selectively fastened to an upper side so as to be used for connecting the two or more types of wiper arms  10  to the wiper blade. 
     The adaptor  20  includes a body portion  21 , a locking portion  22 , the cover portion  23 , the spacer portion  24 , and a base portion  25 . 
     The body portion  21  may be connected to the wiper blade directly or indirectly through the base portion  25  which will be described below. A first type wiper arm  10  may be coupled horizontally or a second type wiper arm  10  may be coupled vertically. 
     Here, the first type wiper arm  10  may be the second wiper arm  10   b  to the fifth wiper arm  10   e  and the like, and the second type wiper arm  10  may be the first wiper arm  10   a,  the sixth wiper arm  10   f,  and the like. For reference, although expressed as an “nth type wiper arm  10 ,” the wiper arm  10  may be construed as one wiper arm  10  and not a plurality of wiper arms  10 . 
     For reference, a third type wiper arm  10  may be fastened to the adaptor  20  widthwise. Here, the third type wiper arm  10  may include the seventh wiper arm  10   g,  the eighth wiper arm  10   h,  and the like. 
     The body portion  21  includes a pair of such side surfaces  211 , the top surface  212 , and the like. The pair of side surfaces  211  and the top surface  212  may be partially covered by the connection portion of the wiper arm  10  when the wiper arm  10  is fastened. 
     Also, components for implementing fastening and separation of the wiper arm  10  may be applied to each of the side surfaces  211  and the top surface  212 , which will be described below. 
     The restriction protrusion  2111  is provided on the side surface  211  of the body portion  21  at a position adjacent to the locking portion  22 . The restriction protrusion  2111  may protrude from the side surface  211  of the body portion  21  to face a front end of the side surface of the connection portion of the first type wiper arm  10  (particularly, the third wiper arm  10   c  or the like) fastened to the body portion  21  horizontally. 
     Also, a first groove  2112  is provided on one side far from the locking portion  22  on the basis of the restriction protrusion  2111  on the side surface  211  of the body portion  21 . The first groove  2112  may be recessed from the side surface  21  of the body portion  211  so that the internal protrusion  101   f  provided inside the second type wiper arm  10  (particularly, the sixth wiper arm  10   f  or the like) fastened to the body portion  21  vertically is guide and held. 
     Also, the through hole  2113  passing through the side surface  211  may be provided in the body portion  21 , In the through hole  2113 , the pin  101   g  or  101   h  of the third type wiper arm  10  (the seventh wiper arm  10   g,  the eighth wiper arm  10   h,  or the like) is fastened to the body portion  21  widthwise is inserted. 
     Here, a size of the through hole  2113  is provided to correspond to a cross section of the pin  101   g  or  101   h,  and the pin  101   a  or  101   h  inserted in the through hole  2113  may be provided to be unable or able to rotate. The pin  101   a  or  101   h  may have a cylindrical shape to be easily inserted into the through hole  2113 . However, separation of the pin  101   g  may be suppressed by the lid portion  102   g  of the seventh wiper arm  10   g  or the like. 
     Also, in the side surface  211  of the body portion  21 , a second groove  2114  configured to guide internal protrusions  101   d  or  101   e  provided inside the first type wiper arm  10  (particularly, the fourth wiper arm  10   d  or the fifth wiper arm  10   e ) fastened to the body portion  21  horizontally may be formed, to be recessed, at a position (for example, a bottom or the like) which does not interfere with the restriction protrusion  2111  and the first groove  2112 . 
     The restriction protrusion  2111  provided on the body portion  21  may protrude from the side surface  211  at a certain height to suppress horizontal insertion of the first type wiper arm  10  fastened to the body portion  21 . However, in this case, a position of the second type wiper arm  10  being fastened to the body portion  21  vertically may be restricted by the restriction protrusion  2111 . 
     In detail, due to the restriction protrusion  2111 , in the second type wiper arm  10  (hereinafter, the sixth wiper arm  101 ), the connection portion is held by the restriction protrusion  2111  in a process of inserting the wiper arm  10  at a position at which a front end of the connection portion is parallel to the restriction protrusion  2111  vertically. Accordingly, in order to fasten the sixth wiper arm  10   f  to the body portion  21  using the first groove  2112 , it is necessary to form an adequate gap between the first groove  2112  and the restriction protrusion  2111 . 
     However, the wiper arm  10  fastened to the body portion  21  is completely fastened by covering the front end using the locking portion  22 . When the first groove  2112  is at a position which recedes adequately from the restriction protrusion  2111 , the front end of the sixth wiper arm  10   f  may not be covered by the locking portion  22 . 
     Accordingly, in the present invention, in order to allow both of the first type wiper arm  10  or the second type wiper arm  10  to be fastened using one adaptor  20 , a shape of the first groove  2112  may be improved. 
     As an example, the first groove  2112  may be provided to be biased toward the locking portion  22  toward an inside portion which blocks insertion of the internal protrusion  101   f  in comparison to an outside portion into which the internal protrusion  101   f  of the sixth wiper arm  10   f  is inserted. 
     In detail, the first groove  2112  may include the guide path  2112   a  into which the internal protrusion  101   f  of the sixth wiper arm  10   f  is inserted and a holding path  2112   b  which is bent from the guide path  2112   a  and extends horizontally. The guide path  2112   a  may include the inside portion which blocks insertion of the internal protrusion  101   f  from the outside portion into which the internal protrusion  101   f  is inserted and may be provided to be tilted toward the locking portion  22  from the outside portion toward the inside portion. 
     In this case, an initial position of the sixth wiper arm  10   f  at which the internal protrusion  101   f  of the sixth wiper arm  10   f  is introduced into the first groove  2112  may recede from a position of the sixth wiper arm  10   f  at which the internal protrusion  101   f  of the sixth wiper arm  10   f  is located on the inside portion of the first groove  2112 . 
     Accordingly, in the embodiment, since the guide path  2112   a  is provided not to be perpendicular but to be tilted (or bent), a function of restricting horizontal movement of the first type wiper arm  10  using the restriction protrusion  2111  of the body portion  21  may be provided while vertical fastening of the sixth wiper arm  10   f  may not interfere with the restriction protrusion  2111 . 
     That is, a distance between the restriction protrusion  2111  and the front end (the inside portion of the guide path  2112   a ), at which the first groove  2112  is most adjacent to the locking portion  22 , is provided to be smaller than a distance between the internal protrusion  101   f  of the sixth wiper arm  10   f  and the front end. 
     The internal protrusion  101   f  of the sixth wiper arm  10   f  is inserted into the outside portion of the guide path  2112   a  and moves along the guide path  2112   a  such that the sixth wiper arm  10   f  may deviate toward the locking portion  22  in comparison to an initial stage of fastening. In this case, the restriction protrusion  2111  provided on the adaptor  20  may be inserted into the recessed portion  102   f  formed in the side surface of the connection portion of the sixth wiper arm  10   f,    
     The internal protrusion  101   f  of the sixth wiper arm  10   f  may be located on the inside portion of the guide path  2112   a  and then may recede in a direction farther away from the locking portion  22  such that the internal protrusion  101   f  may be inserted into the holding path  2112   b.  Since the holding path  2112   b  is bent from the guide path  2112   a  at an acute angle and extends horizontally, vertical movement of the sixth wiper arm  10   f  is restricted due to the internal protrusion  101   f  inserted into the holding path  2112   b.    
     Also, since the guide path  2112   a  of the first groove  2112  is provided to be tilted toward the locking portion  22  in a direction from the outside portion (top end) to the inside portion (bottom end), a position of the holding path  2112   b  may be disposed to be adjacent to the locking portion  22  by as much as a degree at which the guide path  2112   a  is tilted in comparison to a case in which the guide path  2112   a  is vertical. Accordingly, the sixth wiper arm  10   f  may not be restricted in being fastened to the adaptor  20  due to the restriction protrusion  2111  and simultaneously maintain a fastening force since the front end is covered by the locking portion  22  after being fastened. 
     The restriction protrusion  2111  provided on the side surface  211  of the body portion  21  blocks horizontal movement of the first type wiper arm  10  fastened to the adaptor  20  horizontally. Also, the first groove  2112  provided on the side surface  211  of the body portion  21  blocks vertical movement of the second type wiper arm  10  fastened to the adaptor  20  vertically through the holding path  2112   b  extending horizontally. 
     In addition, as described above, the second groove  2114  may be provided on the side surface  211  of the body portion  21 . Here, the second groove  2114  extends horizontally similarly to the holding path  2112   b  of the first groove  2112 . However, the second groove  2114  may be provided to have a shape with an open rear end and be used for fastening the first type wiper arm  10  coupled to the body portion  21  horizontally. 
     As an example, in the case of the fourth wiper arm  10   d.  or the fifth wiper arm  10   e  among the first type wiper arms  10  fastened to the body portion  21  horizontally, the internal protrusion  101   d  or  101   e  may be provided on a bottom end of the side surface of the connection portion. Here, the internal protrusion  101   d  or  101   e  is located below the internal protrusion  101   f  of the sixth wiper arm  10   f.    
     The fourth wiper arm  10   d  or the like is fastened to the body portion  21  horizontally. Here, the internal protrusion  101   d  of the fourth wiper arm  10   d  or the like is inserted into the second groove  2114  and guided along the second groove  2114 . 
     The fourth wiper arm  10   d  horizontally moves to a position at which the inside portion of the second groove  2114  comes into contact with the internal protrusion  101   d  or a position at which the second groove  2114  is adjacent to the internal protrusion  101   d.  Also, vertical movement of the fourth wiper arm  10   d  is restricted by the internal protrusion  101   d  located inside the second groove  2114 . 
     Also, the locking portion  22  may cover a front end of the fourth wiper arm  10   d  so as to add a fastening force of the fourth wiper arm  10   d.  The horizontal movement of the fourth wiper arm  10   d  may be restricted by the elastic protruding portion  2122  provided on the top surface  212  of the body portion  21 , which will be described below. 
     As described above, the body portion  21  may have the side surface  211  including the restriction protrusion  2111 , the first groove  2112 , the second groove  2114 , and the like so as to prepare for fastening of the wiper arms  10  having a variety of shapes. Particularly, to allow the second type wiper arm  10  not to interfere in vertical fastening while the restriction protrusion  2111  is placed to horizontally fasten the first type wiper arm  10 , the first groove  2112  may be formed to be at least partially tilted. 
     An incision portion  2121  may be provided on the top surface  212  of the body portion  21 . The incision portion  2121  may be provided to mount the spacer portion  24  which is used for fastening the wiper arm  10  having a relatively great width. This will be described below. 
     However, the incision portion  2121  may be omitted. In this case, the spacer portion  24  may be fastened to the adaptor  20  using a variety of unlimited coupling methods so as to fasten the wiper arm  10  having a great width. 
     The elastic protruding portion  2122  and the elastic piece  2123  may be provided on the top surface  212 . The front end may be connected to the body portion  21  and a rear end may be provided as a free end so that the elastic protruding portion  2122  and the elastic piece  2123  have vertical elasticity. 
     The elastic protruding portion  2122  is a component which is inserted into the opening  102   d  or  102   e  provided in the first type wiper arm  10  (the fourth wiper arm  10   d,  the fifth wiper arm  10   e,  or the like) fastened to the body portion  21  horizontally and has a cross section smaller than that of the opening  102   d  or  102   e.    
     The elastic protruding portion  2122  is forcibly pressed by the connection portion of the fourth wiper arm  10   d  when the fourth wiper arm  10   d  or the like is inserted into the body portion  21  and then is disposed at a position corresponding to the opening  102   d  of the fourth wiper arm  10   d  and elastically moves upward to be inserted into the opening  102   d  so as to prevent the fourth wiper arm  10   d  from being separated horizontally. 
     The elastic piece  2123  may be provided to be adjacent to the elastic protruding portion  2122 . and the elastic protruding portion  2122  and the elastic piece  2123  may be provided to share the front end. Also, the elastic piece  2123  may be provided to have a shape surrounding a perimeter of the elastic protruding portion  2122  but is not limited thereto. 
     The elastic piece  2123  may be engaged with the insertion piece  104   b  provided on the first type wiper arm  10  (the second wiper arm  10   b  or the like) fastened to the body portion  21  horizontally. When the second wiper arm lab is fastened to the body portion  21 , the insertion piece  104   b  is introduced below the elastic piece  2123  such that the elastic piece  2123  is surrounded by the connection portion of the second wiper arm  10   b  and restricted in upward movement. Accordingly, the locking portion  22 , the second wiper arm  10   b,  the elastic piece  2123 , and the insertion piece  104   b  are sequentially placed vertically so that vertical movement of the second wiper arm  10   b  may be restricted. 
     A hinge portion  213  for providing the locking portion  22  may be provided in front of the body portion  21 . A pair of such hinge portions  213 , which are spaced apart from each other widthwise, are provided to allow the locking portion  22  to rotate and each include a hinge shaft  2131  and a holding key  2132 . 
     The hinge shaft  2131  is fastened to the locking portion  22  and forms a hinge center. The locking portion  22  may implement fastening of the wiper arm  10  while rotating clockwise on the basis of the drawing and may implement separation of the wiper arm  10  while rotating counterclockwise. 
     Here, the hinge portion  213  may use the holding key  2132  to suppress rotation of the locking portion  22  in a state in which the locking portion  22  implements fastening of the wiper arm  10 . The holding key  2132  is held by an uneven portion  2211  provided on a rotational surface  221  of the locking portion  22  according to a rotational angle of the locking portion  22  and restricts rotation of the locking portion  22 . 
     When the rotational surface  221  elastically moves inward due to an external pressure, the uneven portion  2211  may be released from the holding key  2132  so as to allow the locking portion  22  to rotate counterclockwise to expose the front end of the wiper arm  10 . 
     An elastic bar (not shown) configured to connect the pair of hinge portions  213  to each other may be provided between the hinge portions  213 . Engagement between the holding key  2132  and the uneven portion  2211  of the locking portion  22  may be firmly maintained by maintaining a state, in which the pair of hinge portions  213  are spaced apart, using the elastic bar. When an external pressure capable of resisting an elastic force of the elastic bar is applied to the locking portion  22 . the uneven portion  2211  deviates from the holding key  2132  so as to allow the locking portion  22  to rotate counterclockwise. 
     The elastic leg  214  may be provided in the rear of the body portion  21  opposite to the hinge portion  213 . The elastic leg  214  is provided to have an elastic force widthwise in the rear of the body portion  21  and protrudes elastically in comparison to the side surface  211  of the body portion  21  and may be held by a rear end of the first type wiper arm  10 . 
     The holding end  102   b  or  102   c  may be provided on the first type wiper arm  10  (particularly, the second wiper aria  10   b,  the third wiper arm  10   c,  or the like). Here, when the second wiper arm  10   b  or the like is fastened to the body portion  21  horizontally, the holding end  102   b  or  102   c  passes over the elastic leg  214  and the elastic leg  214  protrudes elastically and restricts backward movement of the holding end  102   b  or  102   c.    
     To this end, one surface (rear surface) of the elastic leg  214  to which the wiper arm  10  is fastened may be provided as a tilted surface or a curved surface to be naturally pressed inward by the connection portion of the wiper arm  10  and an opposite surface (front surface) thereof may be provided as a vertical surface, a tilted surface having an inclination greater than that of a front surface to prevent the wiper arm  10  or the like from being released from fastening. 
     A curved portion  215  may be formed between the pair of side surfaces  211  of the body portion  21 . The curved portion  215  may have a convex shape to face an inner surface of the locking portion  22  and is provided to fasten the first wiper arm  10   a  among the second type wiper arms  10 . 
     That is, the curved portion  215  may be provided to correspond to a curved shape of a ring-shaped connection portion of the first wiper arm  10   a,  and the connection portion of the first wiper arm  10   a  is coupled to surround top and bottom of the curved portion  215  when the first wiper arm  10   a  is fastened to the body portion  21 . 
     Also, since the curved portion  215  of the body portion  21  may have a shape having a top or bottom blocked by the side surface  211 , as the first wiper arm  10   a  is fastened to allow the connection portion to surround the curved portion  215 , upward movement of the curved portion  215  may be blocked while simultaneously widthwise movement may be suppressed by the side surfaces  211  of the body portion  21 . 
     A pair of hinge holes  216  provided on both the side surfaces  211  may be provided at the bottom side of the body portion  21 . The hinge holes  216  are components used for fastening the adaptor  20  to the wiper blade and may be coupled to a bar-shaped rotational shaft  251  provided on the base portion  25 . 
     Here, the hinge holes  216  may have a shape with an opened bottom as shown in  FIG. 4  or the like but has a front-rear width of an opened bottom end smaller than a width of the rotational shaft  251  so that the rotational shaft  251  may be forcibly inserted into the hinge holes  216  and then be suppressed from being separated. 
     Also, the hinge holes  216  may have a shape with a closed bottom as shown in  FIG. 8 . In this case, the rotational shaft  251  provided on the base portion  25  may have a shape cut to be introduced into the hinge holes  216  and form a pair of protrusions. However, a width of the cut part of the rotational shaft  251  is formed to be smaller than a gap between the pair of hinge holes  216  so that the rotational shaft  251  may be inserted into the hinge holes  216  and then be fixed to be relatively stable. 
     That is, in the case of  FIG. 4 , the rotational shaft  251  is a bar shape passing through the pair of hinge holes  216  at once. On the other hand, in the case of  FIG. 8 , the rotational shaft  251  may be formed in a shape of a pair of protrusions fastened to the hinge holes  216 . 
     As a structure of the hinge holes  216  and the rotational shaft  251 , any structures capable of preventing the body portion  21  from being separated even when the body portion  21  rotates on the basis of a partial part (base portion  25 ) of the wiper blade may be used. 
     An elastic arm  217  may be provided on the body portion  21 . The elastic arm  217  may be provided on the side surface  211  or the like of the body portion  21 . The adaptor  20  according to the embodiment is provided to allow a variety of types of wiper arms  10  to be selectively couplable. Here, the wiper arms  10  may have different widths. 
     When a width of the body portion  21  is determined in preparation to couple the wiper arm  10  having a relatively small width, a gap is formed between the body portion  21  and the wiper arm  10  when the wiper arm  10  having a relatively great width is fastened so that a fastening force is decreased. 
     Accordingly, in the present invention, the elastic arm  217  configured to come into contact with an internal surface of the wiper arms  10  having different widths which are coupled to the body portion  21  may be provided to protrude from the side surface  211  of the body portion  21 . 
     Here, a degree at which the elastic arm  217  is elastically introduced inward by the wiper arm  10  when the wiper arm  10  having a relatively great width is fastened may be formed to be smaller than a degree at which the elastic arm  217  is elastically introduced inward by the wiper arm  10  when the wiper arm  10  having a relatively small width is fastened. 
     In detail, the elastic arm  217  is provided such that a front end adjacent to the locking portion  22  is formed as a free end and has a shape protruding outward. Here, a part protruding from the elastic arm  217  is in simple contact with the inner surface of the connection portion of the wiper arm  10  instead of being structurally engaged therewith so as to reduce widthwise shaking of the connection portion of the wiper arm  10 . 
     The elastic arm  217  may he provided as a cantilever arm shape which is a component elastically protruding from the body portion  21  toward the side surface  211  and pressed against the connection portion of the wiper arm  10 . Here, one end connected to the body portion  21  may not be limited to a rear end. 
     Also, the elastic arm  217  may be provided on each of the side surfaces  211  of the body portion  21 . A pair of such elastic arms  217  may have different shapes. As an example, the elastic arm  217  on one side may be provided so that a rear end is restricted and a front end is a free end. The elastic arm  217  on the other side may be provided so that a front end is restricted and a rear end is a free end or the like. 
     However, among a variety of types of wiper arms  10  described in the present invention, the elastic arm  217  may not come into contact with an inner surface of the wiper arm  10  (the fourth wiper arm  10   d  or the like) fastened using the spacer portion  24  or the wiper arm  10  (the first wiper arm  10   a,  the eighth wiper arm  10   h,  or the like) fastened using the cover portion  23 . 
     The locking portion  22  may be provided rotatably on the body portion  21 . The locking portion  22  may be provided like a cap shape. In detail, the locking portion  22  has a pair of rotational surfaces  221  rotatably coupled to the hinge portions  213 . A cover surface (without a reference numeral) is provided between the pair of rotational surfaces  221 , and one end of the cover surface covers the wiper arm  10  fastened to the body portion  21 . 
     The rotational surface  221  of the locking portion  22  may be provided to be rotatable about the hinge portion  213 . As an example, the hinge shaft  2131  provided on the hinge portion  213  is inserted into a hole of a hinge element  223  extending from the rotational surface  221  such that the rotational surface  221  may rotate about the hinge shaft  2131 . 
     The uneven portion  2211  is provided on the rotational surface  221 . The uneven portion  2211  may be provided such that an uneven part and a recessed part are adjacent to each other along a rotational direction of the locking portion  22  The uneven part may be provided, as described with the elastic leg  214 , so that one side is tilted and the other side is vertical. 
     Accordingly, when the locking portion  22  rotates clockwise, the holding key  2132  passes over a tilted part of the uneven part of the uneven portion  2211  and is mounted on the recessed part, and the holding key  2132  comes into contact with a vertical part of the uneven part of the uneven portion  2211  so that counterclockwise rotation of the locking portion  22  may be suppressed. 
     However, when an external pressure (particularly, an elastic force of the elastic bar or higher) is applied to the rotational surface  221  in an inward direction, the vertical part of the uneven part of the uneven portion  2211  deviates from the holding key  2132  so that the counterclockwise rotation of the locking portion  22  may be allowed. 
     Here, the rotational surface  221  of the locking portion  22  may be provided so that a part where the uneven portion  2211  is provided has a button-like shape so as to allow an external pressure to be effectively applied to the uneven portion  2211 . 
     A protruding element  2212  is provided on a surface of the rotational surface  221 . The protruding element  2212  is a component configured to allow a user to grip the locking portion  22  to easily rotate the locking portion  22 . Instead of having one protruding structure, coarseness may be imparted to the rotational surface  221  to allow the user to grip the locking portion  22 . 
     On the cover surface between the pair of rotational surfaces  221 , a cover element  222  configured to cover the front end of the connection portion of the wiper arm  10  and to prevent the wiper arm  10  from being separated may be provided. When the locking portion  22  is placed in a locked state, the cover element  222  may be placed at a position projected on the top surface of the wiper arm  10  coupled to the adaptor  20  so as to prevent the wiper arm  10  from deviating upward. 
     The cover element  222  may be provided to extend from the cover surface to the rear end and protrude more rearward than the rotational surface  221  so that steps are formed on both sides of the cover element  222 . Here, a step on a lower side of the cover element  222  may be engaged with a step of the cover portion  23  which will be described below. 
     A hinge element  223  may extend from the rotational surface  221 . The hinge element  223  may extend downward from the rotational surface  221  and include a hole formed therein. A hole is provided in the rotational surface  221  itself so that the hinge element  223  may be provided as a part of the rotational surface  221 . 
     Referring to  FIG. 9 , the hinge shaft  2131  of the hinge portion  213  is inserted into the hole of the hinge element  223  provided below the rotational surface  221 . Here, similar to the part described above with reference to  FIG. 8  in a description of the rotational shaft  251  of the base portion  25 , the hinge shaft  2131  having a pair of protrusions is provided to protrude from the pair of hinge portions  213 . Also, at least a part of the hinge shaft  2131  may be chamfered to be partially tilted to be smoothly insertable into the hinge element  223 . 
     On the other hand, referring to  FIG. 10 , the hinge element  223  of the locking portion  22  may extend downward from the rotational surface  221  but be provided in a center widthwise and the hinge shaft  2131  of the hinge portion  213  may be provided in a bar shape between the pair of hinge portions  213  so as to be similar to a part described with reference to  FIG. 4  in a description of the rotational shaft  251  of the base portion  25 . Here, the hinge element  223  has a shape incised widthwise to allow the bar-shaped hinge shaft  2131  to be insertable thereinto. 
     In the case of  FIG. 9 , the hinge shaft  2131  may be exposed outward. In the case of  FIG. 10 , the hinge shaft  2131  may not be exposed outward unless the locking portion  22  rotates counterclockwise. In the present invention, shapes or a coupling method of the hinge element  223 , the hinge shaft  2313 , and the like of the locking portion  22  are not limited to the above description and all structures in which the locking portion  22  is hinge-rotated about the hinge portion  213  of the body portion  21  may be applied. 
     The cover portion  23  is fastened to the body portion  21  to cover both the side surfaces  211  and the top surface  212  of the body portion  21 . The cover portion  23  may be provided to have a width corresponding to that of the locking portion  22 , and the opening  231  may be provided at a part corresponding to the through hole  2113  of the body portion  21 . 
     The cover portion  23  has a step on a front end. Here, as the cover element  222  protrudes from the locking portion  22 , the step of the cover portion  23  may be engaged with a step provided below the cover element  222 . 
     When a gap between the body portion  21  and the wiper arm  10  is not released by the spacer portion  24  which will be described below, that is, when a width of the connection portion of the wiper arm  10  is relatively great, the cover portion  23  may be used. 
     Otherwise, when a width of the wiper arm  10  is smaller than a width of the body portion  21 , the cover portion  23  may be used to allow the wiper arm  10  to be mounted and suppressed from widthwise movement. 
     As an example, although the first wiper arm  10   a  may be fastened to the adaptor  20  while the cover portion  23  is not fastened to the body portion  21 , as shown in  FIG. 11 . the first wiper arm  10   a  may be fastened to the adaptor  20  while the cover portion  23  is coupled to the body portion  21 . Particularly, since both sides of the cover portion  23  protrude upward from the top surface widthwise, a furrow may be formed at a central part of the top surface. The first wiper arm  10   a  may be mounted on the furrow of the cover portion  23  and widthwise movement thereof may be restricted. 
     Otherwise, in the case of the eighth wiper arm  10   h,  when a width of the lid portion  102   h  is so great as to not be adequate to fix the body portion  21 , the lid portion  102   h  of the eighth wiper arm  10   h  may be fastened to surround the cover portion  23  while the cover portion  23  is coupled to the body portion  21 . 
     The spacer portion  24  may be disposed while being overlapped with the side surface  211  of the body portion  21  to compensate for a gap between the wiper arm  10  and the side surface  211  of the body portion  21  when the wiper arm  10  having a relatively great width (for example, the fourth wiper arm  10   d  or the like) in comparison to the wiper arm  10  (the third wiper arm  10   c  or the like) having the front end facing the restriction protrusion  2111  or the wiper arm  10  (the sixth wiper arm  10   f  or the like) having the internal protrusion  101   f  introduced into the first groove  2112  is fastened. 
     The spacer portion  24  includes at least one layer portion  241  overlapped with at least one of both the side surfaces  211  of the body portion  21 . The layer portion  241  is provided as a plane shape having a certain thickness to increase a width of the body portion  21  and placed to be parallel to the side surface  211  of the body portion  21  so as to relieve a gap which may occur between the side surfaces  211  of the body portion  21  and the inner surface of the wiper arm  10 . 
     Here, the layer portion  241  may be provided on the side surface  211  of the body portion  21  to not interfere with structures used for coupling with the wiper arm  10 . As an example, the layer portion  241  may have a shape with a part corresponding to the through hole  2113  provided in the side surface  211  of the body portion  21  that recedes or passes through. 
     In the case of the eighth wiper arm  10   h  fastened using the through hole  2113 , since the cover portion  23  is used due to the lid portion  102   h  having a great width, it is possible to maintain a state in which the spacer portion  24  is fastened to the body portion  21 . However, in the case of the seventh wiper arm  10   g  which uses the through hole  2113  but has the lid portion  102   h  having a smaller width than that of the eighth wiper arm  10   h,  since it is impossible to fasten the lid portion  102   g  when the spacer portion  24  is maintained, the spacer portion  24  may be separated from the body portion  21  when the seventh wiper arm  10   g  is fastened to the body portion  21 . 
     That is, in consideration of the wiper arm  10  which is fastenable while the spacer portion  24  is provided on the body portion  21 , the layer portion  241  may determine interference bet fastening elements of the wiper arm  10  provided on the side surface  211  of the body portion  21 . 
     Also, the layer portion  241  may expose the second groove  2114  configured to allow the internal protrusion  101   d  or  101   e  of the fourth wiper arm  10   d  or the fifth wiper arm  10   e  to be introduced. That is, a bottom end of the layer portion  241  is located above the second groove  2114  so that the layer portion  241  is provided not to cover the second groove  2114 . 
     Since the second groove  2114  is used for coupling the wiper arm  10  which requires the spacer portion  24 , the layer portion  241  exposes the second groove  2114 . 
     However, the fourth wiper arm  10   d  which is coupled when the spacer portion  24  is used may not use the first groove  2112 . The spacer portion  24  may need to be eliminated from the body portion  21  when the sixth wiper arm  10   f  or the like using the first groove  2112  is fastened. Accordingly, it will be allowed that the layer portion  241  is provided to cover the first groove  2112 . 
     The spacer portion  24  may be detachably provided on the body portion  21  and may be detachably attached to the side surface  211  of the body portion  21  widthwise. In this case, a structure such as an unevenness or the like capable of implementing engagement may be applied between the spacer portion  24  and the side surface  211  of the body portion  21 . 
     When the wiper arm  10  is coupled while the spacer portion  24  is placed on the side surface  211  of the body portion  21 , since the spacer portion  24  is located between the side surface  211  of the body portion  21  and the inner surface of the wiper arm  10 , there is hardly any concern of separation. Accordingly, a coupling force between the spacer portion  24  and the body portion  21  may be adequate when the spacer portion  24  is not separated downward while the wiper arm  10  is coupled to the body portion  21 . 
     Otherwise, the spacer portion  24  may be coupled to the body portion  21  vertically. Here, the spacer portion  24  may include a pair of such layer portions  241  overlapped with both the side surfaces  211  of the body portion  21  and includes a leg portion  242  configured to connect the pair of layer portions  241  widthwise. Here, a width between the layer portions  241  connected by the leg portion  242  may correspond to the width of the body portion  21 . 
     The body portion  21  may include the incision portion  2121  for mounting the spacer portion  24  on the top surface  212 . That is, even when the spacer portion  24  including the leg portion  242  is fastened to the body portion  21 , the leg portion  242  of the spacer portion  24  may be introduced into the incision portion  2121  to prevent a vertical height from being increased by the spacer portion  24 . 
     In addition to a method of coupling the layer portion  241  to the side surface  211  of the body portion  21  directly or indirectly using the leg portion  242 , any structures of the spacer portion  24  may be used as long as a gap between the wiper arm  10  and the side surface  211  of the body portion  21  is filled up. 
     For reference, when the spacer portion  24  is used, the elastic arm  217  provided on the side surface  211  of the body portion  21  may not come into contact with the inner surface of the wiper arm  10  as described above. 
     The base portion  25  is fixed to the wiper blade. The base portion  25  may be fixed to a central part of the wiper blade and provided to be structurally fastened to a central part of the coupling cover or the cover portion  23  as described above. 
     The base portion  25  forms a hinge center f the body portion  21 . As stated above in a part describing the hinge hole  216  of the body portion  21 , the base portion  25  passes through the pair of hinge holes  216  at once and includes the bar-shaped rotational shaft  251  or the rotational shaft  251  having the pair of protrusions fastened to the hinge holes  216  of the body portion  21 . The body portion  21  may be rotatably fastened to the rotational shaft  251  of the base portion  25  and may be provided on the base portion  25  to be hinge-rotated. 
     Hereinafter, a method of selectively coupling a variety of types of wiper arms  10  to one adaptor  20  will be described with reference to  FIGS. 11 to 18 . 
     Referring to  FIG. 11 , when the first wiper arm  10   a  having the ring shape is intended to be vertically fastened to the body portion  21 , the cover portion  23  may be coupled or not coupled to the body portion  21 . That is, the cover portion  23  may be used selectively in the first wiper arm  10   a.    
     The first wiper arm  10   a  moves downward while an end of the connection portion is located in front of the curved portion  215  of the body portion  21 . The first wiper arm  10   a  moves rightward on the basis of the drawing while a top of the connection portion comes into contact with or is adjacent to a top end of the curved portion  215 . 
     In this case, a ring part of the first wiper arm  10   a  is engaged with the curved portion  215  of the body portion  21 . A curvature of the ring part of the first wiper arm  10   a  may be provided corresponding to a curvature of the curved portion  215  of the body portion  21 . Otherwise, the curvature of the first wiper arm  10   a  is formed to be smaller so that the first wiper arm  10   a  may be fastened primarily due to forcible fitting between the curvatures. 
     The ring part of the first wiper arm  10   a  is mounted on the curved portion  215 , and then the locking portion  22  is rotated clockwise. The uneven portion  2211  of the locking portion  22  is held by the holding key  2132  of the hinge portion  213  so that rotation of the locking portion  22  is blocked and the cover element  222  of the locking portion  22  covers the front end of the first wiper arm  10   a.    
     Accordingly, vertical and horizontal movement of the first wiper arm  10   a  may be blocked by the locking portion  22  and engagement between the ring part and the curved portion  215 . Also, widthwise movement of the first wiper arm  10   a.  may be blocked by the furrow structure formed on the top surface of the cover portion  23  as described above. Even when the cover portion  23  is not used, the widthwise movement of the first wiper arm  10   a  may be blocked by a structure of the body portion  21  itself. 
     Referring to  FIG. 12 . the second wiper arm  10   b  may be fastened to the body portion  21  horizontally. When being fastened, the protruding end  101   b  of the second wiper arm  10   b  is provided at a position at which the locking portion  22  will be covered and the holding end  102   b  of the second wiper arm  10   b  is engaged with the elastic leg  214  and the front end faces the restriction protrusion  2111 . 
     Also, the insertion piece  104   b  provided in the opening  103   b  of the second wiper arm  10   b  is introduced below the elastic piece  2123  of the body portion  21  and engaged with the elastic piece  2123 . Here, engagement between the insertion piece  104   b  and the elastic piece  2123  may be seen with naked eyes through the opening  103   b.    
     Covering the front end of the second wiper arm  10   b  by rotating the locking portion  22  clockwise is the same as  FIG. 11 . 
     Accordingly, in the second wiper arm  10   b,  vertical movement may be restricted by the locking portion  22  covering the front end and the engagement between the insertion piece  104   b  and the elastic piece  2123 , and horizontal movement may be restricted by the restriction protrusion  2111  and the engagement between the holding end  102   b  and the elastic leg  214 . 
     Referring to  FIG. 13 , the third wiper arm  10   c  is fastened similarly to the second wiper arm  10   b.  The holding end  102   c  of the third wiper arm  10   c  is provided to be tilted so as to more firmly implement restriction of movement in comparison to the second wiper arm  10   b.    
     Accordingly, in the third wiper arm  10   c,  vertical movement is restricted by the locking portion  22  covering the front end and horizontal movement is restricted by the restriction protrusion  2111  and engagement between the holding end  102   c  and the elastic leg  214 . 
     Referring to  FIG. 14 , the fourth wiper arm  10   d  is inserted into the body portion  21  horizontally. Here, since a width of the fourth wiper arm  10   d  is provided to be relatively greater than a width of the body portion  21 , a gap may be formed between the fourth wiper arm  10   d  and the side surface  211  of the body portion  21 . 
     When the gap is formed, there is concern that the wiper arm  10  may shake widthwise and a fastening force may be decreased. Accordingly, in the embodiment, the spacer portion  24  may be fastened to the body portion  21  and then the fourth wiper arm  10   d  may be coupled to the body portion  21 . 
     Also, the opening  102   d  is provided in the fourth wiper arm  10   d.  The opening  102   d  of the fourth wiper arm  10   d  may be engaged with the elastic protruding portion  2122  provided on the top surface  212  of the body portion  21 . That is, when the fourth wiper arm  10   d  is fastened to the body portion  21  horizontally, the elastic protruding portion  2122  of the body portion  21  may be pushed by the connection portion of the fourth wiper arm  10   d  and then be disposed and protrude at a position of the opening  102   d  so as to be introduced into the opening  102   d  and be engaged with the opening  102   d.    
     Particularly, the elastic protruding portion  2122  may be a shape having a strong suppressing force in a direction in which the fourth wiper arm  10   d  is released from being fastened. On the other hand, the elastic protruding portion  2122  may have a structure of being elastically pressurized easily in a direction, in which the fourth wiper arm  10   d  is fastened, so as to naturally allow the fourth wiper arm  10   d  to be coupled. 
     The internal protrusion  101   d  is provided on the connection portion of the fourth wiper arm  10   d  and is guided along the second groove  2114  provided on the side surface  211  of the body portion  21 . Although the first groove  2112  is covered by the spacer portion  24 , the fourth wiper arm  10   d  may be fastened using the second groove  2114 . 
     Although the from end of the fourth wiper arm  10   d  is covered by the cover element  222  of the locking portion  22 , the fourth wiper arm  10   d  may be introduced below the cover element  222  without interfering with the locking portion  22  when the fourth wiper arm  10   d  is fastened. 
     Accordingly, the fourth wiper arm  10   d  may be coupled to the body portion  21  horizontally while the locking portion  22  is in a lock state. Also, since a width of the fourth wiper arm  10   d  may be greater than a width of the locking portion  22 , a rear end of the rotational surface  221  of the locking portion  22  may face the front end of the fourth wiper arm  10   d.    
     Through this fastening, horizontal movement of the fourth wiper arm  10   d  may be blocked by the locking portion  22  and engagement between the elastic protruding portion  2122  and the opening  102   d  and vertical movement thereof may be blocked by the internal protrusion  101   d  mounted on the second groove  2114 . 
     Referring to  FIG. 15 , the same fastening method is used for the fifth wiper arm  10   e  except a small width in comparison to that of the fourth wiper arm  10   d.  Accordingly, unlike that shown in  FIG. 14 , the fifth wiper arm  10   e  may he fastened to the body portion  21  without the spacer portion  24 . and others are the same as in the above description of the fourth wiper arm  10   d.    
     Referring to  FIG. 16 , the sixth wiper arm  10   f  may be fastened to the body portion  21  vertically. The sixth wiper arm  10   f  includes the internal protrusion  101   f  provided inside the connection portion. However, the internal protrusion  101   f  of the sixth wiper arm  10   f  may be provided on the side surface of the connection portion above a bottom end and may be placed at a position not inserted into the second groove  2114 . 
     The internal protrusion  101   f  may be introduced into the first groove  2112  provided in the side surface  211  of the body portion  21 . However, when the first groove  2112  is provided to be vertical to fasten the sixth wiper arm  10   f  to the body portion  21  vertically, the front end of the sixth wiper arm  10   f  may be held by the restriction protrusion  2111  provided on the body portion  21 . 
     Accordingly, since the first groove  2112  of the body portion  21  is provided to be tilted as described above, the first groove  2112  may deviate in a direction farther away from the restriction protrusion  2111  toward the outside portion into which the internal protrusion  101   f  is inserted in comparison to the inside portion where the insertion of the internal protrusion  101   f  is blocked. 
     Accordingly, although the internal protrusion  101   f  of the sixth wiper arm  10   f  is introduced into the outside portion of the first groove  2112 , the sixth wiper arm  10   f  may not interfere with the restriction protrusion  2111  in a fastening process. However, corresponding to the titled shape of the first groove  2112 , a direction in which the sixth wiper arm  10   f  is fastened may be a tilted vertical direction not a perpendicular vertical direction. 
     When the internal protrusion  101   f  of the sixth wiper arm  10   f  is located on the inside portion of the first groove  2112 , the restriction protrusion  2111  may be located on the recessed portion  102   f  provided in the connection portion of the sixth wiper arm  10   f.  Accordingly, when the sixth wiper arm  10   f  is fastened, the restriction protrusion  2111  of the body portion  21  is mounted on the recessed portion  102   f  of the sixth wiper arm  10   f  without interfering with the internal protrusion  101   f  of the sixth wiper arm  10   f.    
     Subsequently, as the sixth wiper arm  10   f  moves horizontally, the internal protrusion  101   f  moves into the holding path  2112   b  of the first groove  2112  so that vertical movement of the sixth wiper arm  10   f  may be restricted by engagement between the internal protrusion  101   f  and the holding path  2112   b.    
     As the locking portion  22  in a lock-released state rotates clockwise and changes to a lock state to cover the front end of the sixth wiper arm  10   f,  upward movement may be restricted by the locking portion  22 . 
     Accordingly, vertical movement of the sixth wiper arm  10   f  may be restricted by the locking portion  22  and engagement between the internal protrusion  101   f  and the holding path  2112   b,  and horizontal movement thereof may be restricted as the front end of the sixth wiper arm  10   f  comes into contact with the locking portion  22 . 
     Referring to  FIG. 17 , the seventh wiper arm  10   g  may include the pin  101   g  and be fastened to the body portion  21  widthwise. Since the through hole  2113  is provided in the body portion  21 , the seventh wiper arm  10   g  is fastened in a direction in which the pin  101   g  is inserted into the through hole  2113 . 
     Subsequently, the lid portion  102   g  provided on the seventh wiper arm  10   g  surrounds the top surface  212  or the like of the body portion  21 . To this end, the seventh vesper arm  10   g  may rotate by a certain angle on the basis of the pin  101   g  while the pin  101   g  passes through the through hole  2113 . 
     The lid portion  102   g  may have a shape extending widthwise to correspond to the width of the body portion  21  and having a bent end to surround the side surface  211  of the body portion  21 . The lid portion  102   g  may not be bent depending on a fastening force between the pin  101   g  and the through hole  2113 . 
     The seventh wiper arm  10   g  may be provided not to be covered by the locking portion  22 . That is, the seventh wiper arm  10   g  may be coupled to the body portion  21  while the locking portion  22  is in a lock state. Here, all vertical and lateral movement of the seventh wiper arm  101   g  may be blocked by fastening between the pin  10   g  and the through hole  2113 , and additionally, widthwise movement thereof may be blocked by the lid portion  102   g.    
     Referring to  FIG. 18 , the eighth wiper arm  10   h  may be provided to include the pin  101   h  and the lid portion  102   h  similarly to the seventh wiper arm  10   g.  However, although a slight different may be in a shape of the connection portion, a fastening method is similar to that of the seventh wiper arm  10   g.    
     The lid portion  102   h  of the eighth wiper arm  10   h  may be provided to have a great width in comparison to the seventh wiper arm  10   g.  In this case, the lid portion  102   h  may have the width greater than that of the body portion  21 . Accordingly, the adaptor  20  may couple the eighth wiper arm  10   h  by fastening the spacer portion  24  to the body portion  21 . 
     Otherwise, the cover portion  23  is fastened to the body portion  21  to secure an adequate width and then the eighth wiper arm  10   h  is coupled thereto so that the lid portion  102   h  of the eighth wiper arm  10   h  may be fastened to the adaptor  20  adequately. 
     Here, when a width of the lid portion  102   h  is great, since a strength of the lid portion  102   h  itself may become a problem, the lid portion  102   h  may be prepared for deformation by applying a partial uneven structure. 
     Vertical and horizontal movement of the eighth wiper arm  10   h  may be restricted by engagement between the pin  101   h  and the through hole  2113  (and the opening  231  of the cover portion  23 ), and widthwise movement thereof may be additionally restricted by the lid portion  102   h.    
     As described above, in the embodiment, a structure and a shape of the adaptor  20  have been improved to couple two or more types of wiper arms  10  having a variety of forms. Particularly, the restriction protrusion  2111  facing the front end of the wiper arm  10  fastened horizontally may be included and a shape of the first groove  2112  may be limited to be tilted so as to smoothly couple the wiper arm  10  fastened vertically. 
     According to the present invention, an adaptor for assembling a wiper blade, a wiper blade assembly, and a wiper device are configured to easily fasten a plurality of wiper arms without a problem by limiting a shape of a groove or the like so that a component to be engaged with a wiper arm fastened horizontally is not to interfere with a wiper arm fastened vertically. 
     Although the exemplary embodiments of the present invention have been described above, these are merely for describing the present invention in detail and the present invention is not limited thereto. Also, it is apparent that a variety of modifications and improvements thereof may be made by one of ordinary skill in the art without departing from the technical concept of the present invention. 
     All simple modifications and changes of the present invention are included within the scope of the present invention, and a detailed scope of the present invention will be defined by the following claims.