Patent Publication Number: US-10770837-B2

Title: Connector having a slider holder

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims priority from Japanese Patent Application No. 2018-164547 filed on Sep. 3, 2018, the entire contents of which are incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to a connector. 
     Description of Related Art 
     In the related art, it is widely known that a connector including a housing that includes a lock portion maintaining a completely fitted state with a mating housing is provided with a slide holder for detecting an incompletely fitted state between the housing and the mating housing (see, for example, Patent Literature 1). 
     The slide holder is mounted on the housing so as to be movable in a fitting direction of the housing and the mating housing between a temporary locking position and a main locking position, and is configured to be movable from the temporary locking position to the main locking position while avoiding interference with the lock portion only in the completely fitted state. That is, in the incompletely fitted state, the slide holder cannot move from the temporary locking position to the main locking position due to interference with the lock portion, so that the incompletely fitted state between the housing and the mating housing can be easily detected. 
     [Patent Literature 1] JP-A-2006-80025 
     According to a related art, a housing including a slide holder is provided with a pair of protective walls extending in a fitting direction so as to sandwich a lock portion and the slide holder in a width direction orthogonal to a fitting direction in order to protect the lock portion of the housing and the slide holder. That is, the pair of protective walls is provided so as to cover the lock portion and the slide holder from both sides in the width direction. 
     The connector where the slide holder is mounted on the housing is transported in a state in which the slide holder is held in the temporary locking position. However, during transport, the slide holder may unintentionally move from the temporary locking position to the main locking position due to contact with a peripheral member or the like. For this reason, it is required to visually see from the width direction that the slide holder is in the temporary locking position at a stage of the transport or a next step after the transport. 
     However, when the housing is viewed from the width direction, depending on the shape of the protective walls, the protective walls may become an obstacle to make it impossible to visually see whether the slide holder is in the temporary locking position. As described above, it is required to make it visible easily whether the slide holder in the housing provided with the pair of protective walls is in the temporary locking position. 
     SUMMARY 
     One or more embodiments provide a connector where it is easily visible from a width direction of the housing whether a slide holder mounted on a housing including a pair of protective walls is in a temporary locking position. 
     In an aspect (1), one or more embodiments provide a connector including a housing and a slide holder. The housing includes a lock portion maintaining a completely fitted state with a mating housing. The slide holder is configured to be mounted on the housing so as to be movable in a fitting direction of the housing and the mating housing between a temporary locking position and a main locking position, and is movable from the temporary locking position to the main locking position while avoiding interference with the lock portion only in the completely fitted state. The housing includes a pair of protective walls extending in the fitting direction so as to sandwich the lock portion and the slide holder in a width direction orthogonal to the fitting direction. The protective wall includes a notch which makes a part of the slide holder visible when the slide holder is in the temporary locking position, and makes the part of the slide holder invisible when the slide holder is in the main locking position when viewed from the width direction. 
     In an aspect (2), the housing and the slide holder may include locking structures for locking the slide holder in the temporary locking position. The slide holder and the pair of protective walls may include guide structures that guide the movement of the slide holder with respect to the housing. The guide structures may have relief portions for making the slide holder inclined with respect to the housing in a direction in which the interference of the locking structures is avoided when the slide holder is mounted on the housing. 
     According to the connector having the aspect [1], the protective walls are provided with notches respectively which make a part of the slide holder visible when the slide holder is in the temporary locking position, and make the part (same part) of the slide holder invisible when the slide holder is in the main locking position when viewed from the width direction. As a result, it is easily visible from the width direction of the housing whether the slide holder mounted on the housing including the pair of protective walls is in the temporary locking position. 
     According to the connector having the aspect [2], relief portions are provided in guide structures constituted by the slide holder and the pair of protective walls. As a result, in a state in which the slide holder is inclined with respect to the housing so as to avoid interference of locking structures constituted by the housing and the slide holder, the slide holder can be smoothly mounted on the housing and locked in the temporary locking position by using the guide structures without the interference of the locking structures. As a result, an engagement margin of the locking structures can be increased, and the slide holder can be more reliably locked in the temporary locking position. 
     Advantageous Effects of Invention 
     According to one or more embodiments, it is possible to provide the connector where it is easily visible from the width direction of the housing whether the slide holder mounted on the housing including the pair of protective walls is in the temporary locking position. 
     The present invention has been briefly described as above. Further, details of the present invention will be clarified by reading a mode for carrying out the invention to be described below with reference to accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is an exploded perspective view of a connector according to an embodiment. 
         FIG. 2A  is a top view of a housing shown in  FIG. 1 .  FIG. 2B  is a rear view of the housing. 
         FIG. 3  is a sectional view taken along a line  3 - 3  of  FIG. 2B . 
         FIG. 4  is an enlarged view of an inside of a frame indicated by a reference numeral  4  in  FIG. 3 . 
         FIG. 5A  is a top view of a slide holder shown in  FIG. 1 .  FIG. 5B  is a front view of the slide holder. 
         FIG. 6A  is a side view of the slide holder.  FIG. 6B  is an enlarged view of an inside of a frame indicated by a reference number  6 ( b ) in  FIG. 6A . 
         FIGS. 7A and 7B  are views corresponding to  FIGS. 2A and 2B  in a state in which the slide holder is in a temporary locking position. 
         FIG. 8A  is a cross-sectional view taken along a line  8 ( a )- 8 ( a ) of  FIG. 7B .  FIG. 8B  is a side view of the housing in a state in which the slide holder is in the temporary locking position. 
         FIG. 9  is an enlarged view of inside of a frame indicated by a reference numeral  9  in  FIG. 8B . 
         FIGS. 10A and 10B  are views corresponding to  FIGS. 2A and 2B  in a state in which the slide holder is in a main locking position. 
         FIG. 11A  is a cross-sectional view taken along a line  11 ( a )- 11 ( a ) of  FIG. 10B .  FIG. 11B  is a side view of the housing in a state in which the slide holder is in the main locking position. 
         FIG. 12  is an enlarged view of inside of a frame indicated by a reference numeral  12  in  FIG. 11B . 
         FIG. 13  is a front view of a front holder shown in  FIG. 1 . 
         FIG. 14  is a sectional view taken along a line  14 - 14  of  FIG. 13 . 
         FIG. 15  is a sectional view taken along a line  15 - 15  of  FIG. 13 . 
         FIG. 16  is an enlarged view of inside of a frame indicated by a reference numeral  16  in  FIG. 15 . 
         FIG. 17  is a front view of the housing in a state in which the front holder is in the temporary locking position. 
         FIG. 18  is a cross-sectional view taken along a line  18 - 18  of  FIG. 17 . 
         FIG. 19  is an enlarged view of inside of a frame indicated by a reference numeral  19  in  FIG. 18 . 
         FIG. 20  is a side view of a tip portion including a protrusion in a protrusion support portion of the housing. 
         FIG. 21  is a view corresponding to  FIG. 18  in a state in which the front holder is in the main locking position. 
         FIG. 22  is an enlarged view of inside of a frame indicated by a reference numeral  22  in  FIG. 21 . 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     &lt;Embodiment&gt; 
     Hereinafter, a connector  1  according to an embodiment of the present invention will be described with reference to the drawings. Hereinafter, as shown in  FIG. 1 , a “front-rear direction”, a “width direction”, an “upper-lower direction”, “front”, “rear”, “upper”, and “lower” are defined for convenience of description. The “front-rear direction”, the “width direction”, and the “upper-lower direction” are orthogonal to one another. The front-rear direction coincides with a fitting direction of the connector  1  and a mating connector (not shown), and a front side (left side in  FIG. 1 ) in the fitting direction in which the mating connector is fitted is a front side, and a back side (right side in  FIG. 1 ) in the fitting direction opposite to the mating direction is a rear side. 
     As shown in  FIG. 1 , the connector  1  includes a housing  2 , a slide holder  3  mounted on an upper portion of the housing  2 , a packing  4  mounted on the housing  2  from the front side, and a front holder  5  mounted on the housing  2  from the front side. First, a configuration of a portion related to mounting of the slide holder  3  on the housing  2  and a configuration of the slide holder  3  will be described. 
     &lt;Portion Related to Mounting of Slide Holder  3  on Housing  2  and Slide Holder  3 &gt; 
     First, a portion relating to the mounting of the slide holder  3  on the housing  2  will be described. As shown in  FIGS. 1, 2A, 2B and 3 , the housing  2  made of resin includes an outer cylindrical portion  11  having a substantially rectangular cylindrical shape. A terminal housing portion  12  is integrally provided inside the outer cylindrical portion  11  so as to form an annular gap that opens to the front side. The annular gap functions as a space into which a frame body portion  51  (to be described later) of the front holder  5  is inserted when the front holder  5  is mounted. 
     A central portion in the width direction of a front side portion of an upper wall constituting the outer cylindrical portion  11  bulges upward. An insertion space  13  for a mating lock portion into which a mating lock portion (not shown) of a mating housing is inserted as formed below the bulging portion so as to communicate with the annular gap. 
     A pair of protective walls  14  is integrally provided on a rear side part of the upper wall constituting the outer cylindrical portion  11  so as to extend rearward from both end portions in the width direction of the bulging portion and face each other in the width direction. A space between the pair of protective walls  14  functions as a slide holder mounting space  15  for mounting the slide holder  3 . The slide holder mounting space  15  communicates with the insertion space  13  for a mating lock portion in the front-rear direction (see  FIG. 3 ). The slide holder  3  is inserted into and mounted on the slide holder mounting space  15  from a rear side. 
     As shown in  FIG. 3 , a guide groove  16  recessed outward in the width direction for guiding the slide holder  3  is formed on a widthwise inner side surface of each protective wall  14  so as to extend in the front-rear direction. A tapered portion  17  of which an upper inner wall of the guide groove  16  is inclined rearward and upward is formed at a rear end portion of the guide groove  16  (that is, an end portion on a side where the slide holder  3  is inserted) (see also  FIG. 4 ). The function of the tapered portion  17  will be described later. 
     As shown in  FIG. 8A  (see also  FIG. 2 ), a lock portion  18  is integrally provided on the rear side part of the upper wall constituting the outer cylindrical portion  11 . The lock portion  18  has a function of maintaining a completely fitted state between the housing  2  and the mating housing by engaging with the mating lock portion of the mating housing. 
     The lock portion  18  includes a pair of lock arms  19  extending forward from a rear end portion between the pair of protective walls  14  on the rear side part of the upper wall of the outer cylindrical portion  11  toward the insertion space  13  for a mating lock portion, and a connecting portion  20  that is connected to tip end portions of the pair of lock arms  19  in the width direction. When the mating lock portion is engaged with the connecting portion  20 , the completely fitted state between the housing  2  and the mating housing is maintained. 
     As shown in  FIG. 8B  (see also  FIGS. 1 and 9 ), a notch  21  recessed forward is formed on a rear end surface of each protective wall  14 . The function of the notch  21  will be described later. 
     As shown in  FIG. 8A  (also see  FIG. 2 ), a protrusion  22  protruding upward is formed at a central portion in the width direction (between root portions of the pair of lock arms  19 ) of the rear end portion of the rear side part of the upper wall of the outer cylindrical portion  11 . The protrusion  22  has a function of holding the slide holder  3  in a temporary locking position. 
     Next, the slide holder  3  will be described. As shown in  FIGS. 1, 5A, 5B, 6A and 6B , the slide holder  3  made of resin integrally includes a rectangular flat plate-shaped main body portion  31 , a detection arm  32  extending downward and forward from the central portion in the width direction of a rear end portion of the main body portion  31 , and a pair of side plate portions  33  extending downward from both side edges in the width direction of the main body portion  31 . 
     An engaging portion  34  (see also  FIG. 8A ) that engages with the connecting portion  20  of the lock portion  18  is formed at a tip end portion of the detection arm  32 . A protrusion  35  protruding downward is formed on a lower surface of a root portion of the detection arm  32  (see also  FIG. 5B ). The slide holder  3  is held in the temporary locking position by engaging the protrusion  22  of the housing  2  with the protrusion  35  of the slide holder  3  (see  FIG. 8A ). 
     A guide rib  36  protruding outward in the width direction is formed so as to extend in the front-rear direction at a lower end edge portion of a widthwise outer side surface of each side plate portion  33 . A tapered portion  37  in which an upper side inner wall of the guide rib  36  is inclined forward and downward is formed at a front end portion of the guide rib  36  (that is, the end portion of the slide holder  3  on the insertion side) (see also  FIG. 6B ). The function of the tapered portion  37  will be described later. 
     When the slide holder  3  described above is mounted on the housing  2 , the slide holder  3  is brought close to the slide holder mounting space  15  of the housing  2  from the rear side. Then, as shown in  FIG. 8A , the slide holder  3  is mounted on the housing  2  such that the pair of guide ribs  36  is inserted into the pair of guide grooves  16  and the protrusion  35  rides over the protrusion  22  and is located on a front side of the protrusion  22 . Accordingly, as shown in  FIG. 8A , the slide holder  3  is held in the temporary locking position. 
     At this time, since the tapered portion  17  is formed in the guide groove  16  and the tapered portion  37  is formed in the guide rib  36 , compared with a case where the tapered portions  17 ,  37  are not formed, the slide holder  3  can be smoothly mounted on the housing  2  and locked in the temporary locking position without interference caused between the protrusion  35  and the protrusion  22  in a state in which the rear side of the slide holder  3  is inclined more upward than the front side with respect to the housing  2 . 
     As shown in  FIG. 8A , in the temporary locking position of the slide holder  3 , the engaging portion  34  located at the tip end of the detection arm  32  of the slide holder  3  is engaged with the connecting portion  20  of the lock portion  18  of the housing  2 . As a result, the slide holder  3  cannot move from the temporary locking position to the main locking position (see  FIG. 11 ) that is forward of the temporary locking positon. 
     In this state, when the mating housing is fitted to the housing  2  to be in the completely fitted state, the completely fitted state of the housing  2  and the mating housing is maintained by engaging the mating lock portion with the connecting portion  20 , and the engagement between the engaging portion  34  and the connecting portion  20  is released by the mating lock portion pushing the engaging portion  34  downward. That is, the slide holder  3  can be moved from the temporary locking position to the main locking position. 
     Therefore, in the completely fitted state, by pushing the slide holder  3  in the temporary locking position forward, the slide holder  3  is moved to the main locking position as shown in  FIGS. 11A and 11B . Meanwhile, in the incompletely fitted state, since the mating lock portion does not push the engaging portion  34  downward and the engagement between the engaging portion  34  and the connecting portion  20  is not released, the slide holder  3  cannot move from the temporary locking position to the main locking position. As described above, since the slide holder  3  cannot move from the temporary locking position to the main locking position, the incompletely fitted state between the housing  2  and the mating housing can be easily detected. 
     Hereinafter, the function of the pair of notches  21  provided in the pair of protective walls  14  will be described. As shown in  FIGS. 8B and 9 , in a state in which the slide holder  3  is in the temporary locking position, when the housing  2  is viewed from the width direction, a part of the side plate portion  33  of the slide holder  3  can be visually recognized via the notch  21 . Meanwhile, as shown in  FIGS. 11B and 12 , in a state in which the slide holder  3  is in the main locking position, when the housing  2  is viewed from the width direction, the part (the same part) of the side plate portion  33  of the slide holder  3  cannot be visually recognized via the notch  21 . 
     As a result, when the notch  21  of the housing  2  is viewed from the width direction, it is easily visible whether the slide holder  3  mounted on the housing  2  including the pair of protective walls  14  is in the temporary locking position. The configuration of the portion related to the mounting of the slide holder  3  on the housing  2  and the configuration of the slide holder  3  have been described above. Next, a configuration of a portion related to the mounting of the front holder  5  on the housing  2  and a configuration of the front holder  5  will be described. 
     &lt;Portion Related to Mounting of Front Holder on Housing  2  and Front Holder  5 &gt; 
     First, the portion related to the mounting of the front holder  5  on the housing  2  will be described. As shown in  FIGS. 17 and 18 , a terminal housing chamber  23  for housing a terminal (not shown) is formed in the terminal housing portion  12  of the housing  2  so as to extend in the front-rear direction. In this example, two terminal housing chambers  23  are provided so as to be aligned in the width direction. 
     In each terminal housing chamber  23 , a cantilever-shaped lance  24  which is elastically deformable in the width direction so as to face the inside of the terminal housing chamber  23  from the inside in the width direction is provided so as to extend forward from a substantially central position in the front-rear direction of the terminal housing chamber  23 . A lance protrusion  25  extending toward the inside of the terminal housing chamber  23  is integrally formed at a tip end of the lance  24 . By locking a predetermined corner of the terminal inserted into the terminal housing chamber  23  from the rear side with the lance protrusion  25 , the locking lance  24  exerts a function of preventing the terminal from coming out toward the rear side. 
     When the terminal is in a normal insertion position (in a state in which the lance  24  exerts a retaining function) in the terminal housing chamber  23 , the lance protrusion  25  enters the corner of the terminal, so that the lance  24  is maintained in a normal posture (posture shown in  FIG. 18 ) without elastic deformation. Meanwhile, when the terminal is in the halfway insertion position (in a state in which the lance  24  does not exert the retaining function), the lance  24  is maintained in a posture of being elastically deformed inward in the width direction (a side away from the terminal) due to a fact that the lance protrusion  25  cannot enter the corner of the terminal. 
     In a widthwise inner region of the lance  24  provided in each terminal housing chamber  23  (a region away from the terminal housing chamber  23 ), a cantilever-shaped protrusion support portion  26  which has a gap in the width direction with the lance  24  and is elastically deformable in the width direction is provided so as to extend forward from a position near a base portion of the lance  24 . A protrusion  27  (see also  FIGS. 1 and 20 ) that protrudes inward in the width direction and extends in the upper-lower direction is provided on a widthwise inner side surface of a tip end of the protrusion support portion  26 . The protrusion  27  of the protrusion support portion  26  has a function of locking the front holder  5  to the temporary locking position and the main locking position (to be described later). 
     Next, the front holder  5  will be described. As shown in  FIGS. 13 to 15 , the front holder  5  made of resin includes the frame body portion  51  having a rectangular cylindrical shape. A functional portion  52  is integrally provided inside the frame body portion  51 . 
     As shown in  FIG. 14 , the functional portion  52  integrally includes a base portion  53 , a pair of locking arms  54  extending forward from both end portions of the base portion  53  in the width direction, a pair of extending portions  55  extending outward in the width direction from tip end portions of the pair of locking arms  54 , and a pair of detection arms  56  extending rearward from widthwise outer side end portions of the pair of extending portions  55 . Since the pair of extending portions  55  is integrated with the frame body portion  51 , the entire functional portion  52  is formed integrally with the frame portion  51 . A gap  57  in the width direction exists between the locking arm  54  and the detection arm  56 . 
     Hereinafter, for convenience of description, only a configuration of a left side portion of the functional portion  52  in  FIG. 14  will be described, but a right side portion of the functional portion  52  has a similar configuration. 
     The locking arm  54  extending in the front-rear direction has a both-end supported beam shape which is elastically deformable in the width direction, in which a root portion (rear end side) is supported by the base portion  53  and a tip end portion (front end side) is supported by the extending portion  55 . A temporary locking protrusion  58  and a main locking protrusion  59  are provided on a widthwise outer side surface of the locking arm  54  (see also  FIGS. 19 and 22 ). 
     The temporary locking protrusion  58  is provided at the root portion of the locking arm  54 , and the locking protrusion  59  is provided at a position forward of the temporary locking protrusion  58 . The temporary locking protrusion  58  and the main locking protrusion  59  are disposed at mutually different positions in the upper-lower direction for the convenience of manufacture. 
     As shown in  FIGS. 13 to 15 , a plurality of recesses  60  recessed rearward are formed in a front end surface between the root portions of the pair of locking arms  54  in the base portion  53  (see also  FIG. 16 ). By forming the recesses  60  in this manner, even if a thickness of the base portion  53  in the front-rear direction is increased and a length of the locking arm  54  is shortened, it is possible to effectively suppress generation of sinks and voids at the time of molding due to the increase in the thickness of the base portion  53  in the front-rear direction. 
     One of the plurality of recesses  60  is formed at a position facing a surface on a side opposite to the side where the temporary locking protrusion  58  is formed on the root portion of the locking arm  54 . As a result, a thickness of the temporary locking protrusion  58  in protrusion direction (that is, the width direction) on the locking arm  54  at the place where the temporary locking protrusion  58  is formed is reduced. As a result, the locking arm  54  around the temporary locking protrusion  58  is easily elastically deformed so as to reduce a protruding height of the temporary locking protrusion  58  from the locking arm  54 . 
     When the front holder  5  described above is mounted on the housing  2 , first, the rectangular cylindrical packing  4  made of rubber (see  FIG. 1 ) is inserted into an annular gap between the outer cylindrical portion  11  and the terminal housing portion  12  of the housing  2  and fixed to a predetermined position on an outer periphery of the terminal housing portion  12  (see  FIG. 18 ). A plurality of (three in this example) annular lip portions  41  are formed on an outer peripheral surface of the packing  4 . The annular lip portion  41  performs a function of sealing the mating housing and the housing  2  in a watertight manner when the mating housing is fitted into the housing  2 . 
     Next, the front holder  5  is inserted into the annular gap from the front side. At this time, as shown in  FIG. 18 , the protrusion support portion  26  of the housing  2  is inserted into the gap  57  of the front holder  5 . When the front holder  5  is inserted into the annular gap, the temporary locking protrusion  58  of the front holder  5  comes into contact with the protrusion  27  of the support portion  26 . 
     After the temporary locking protrusion  58  comes into contact with the protrusion  27 , the temporary locking protrusion  58  rides on the protrusion  27  by elastically deforming the locking arm  54  and the protrusion support portion  26  in a direction (width direction) away from each other as the insertion proceeds. Here, as described above, since the protrusion support portion  26  is elastically deformed in a direction (width direction) away from the temporary locking protrusion  58 , and the locking arm  54  around the temporary locking protrusion  58  is easily elastically deformed so as to reduce the protruding height of the temporary locking protrusion  58  from the locking arm  54 , it is possible to effectively suppress crushing of the contact portions when temporary locking protrusion  58  rides over the protrusion  27 . 
     Thereafter, as the insertion proceeds, the temporary locking protrusion  58  rides over the protrusion  27 , so that the locking arms  54  and the protrusion support portion  26  are elastically returned. As a result, as shown in  FIGS. 18 and 19 , when the temporary locking protrusion  58  is located rearward of the protrusion  27  and the main locking protrusion  59  is located forward of the protrusion  27 , by engaging the temporary locking protrusion  58 , the main locking protrusion  59  with the protrusion  27 , the front holder  5  is held at the temporary locking position. 
     In this state, when the terminal is inserted into the terminal housing chamber  23  to the normal insertion position, as described above, the lance  24  is maintained in the normal posture (the posture shown in  FIG. 18 ). Therefore, it is possible to obtain a state in which a tip end portion of the detection arm  56  of the front holder  5  can enter a gap between the lance  24  and the protrusion support portion  26 . Therefore, in a state in which the terminal is in the normal insertion position, when the front holder  5  in the temporary locking position is pushed rearward, as shown in  FIG. 21 , the front holder  5  moves to the main locking position by the tip end portion of the detection arm  56  entering the gap between the lance  24  and the protrusion support portion  26 . At this time, when the main locking protrusion  59  rides over the protrusion  27  and the main locking protrusion  59  is located rearward of the protrusion  27 , the front holder  5  is held in the main locking position by engaging the main locking protrusion  59  with the protrusion  27 . 
     On the other hand, in a state in which the terminal is in the halfway insertion position, as described above, the lance  24  is maintained in the posture of being elastically deformed inward in the width direction (the side away from the terminal). Therefore, the gap between the lance  24  and the protrusion support portion  26  is narrowed, so that the tip end portion of the detection arm  56  cannot enter the gap between the lance  24  and the protrusion support portion  26 . As a result, the front holder  5  cannot move from the temporary locking position to the main locking position. In this way, since the front holder  5  cannot move from the temporary locking position to the main locking position, it is possible to easily detect the halfway insertion of the terminal. 
     &lt;Functions and Effects&gt; 
     According to the connector  1  of the embodiment of the present invention, the pair of protective walls  14  is provided with the notches  21  respectively which make a part of the slide holder  3  visible when the slide holder  3  is in the temporary locking position, and make the part (same part) of the slide holder  3  invisible when the slide holder  3  is in the main locking position when viewed from the width direction. As a result, it is easily visible from the width direction of the housing  2  whether the slide holder  3  mounted on the housing  2  having the pair of protective walls  14  is in the temporary locking position. 
     Further, according to the connector  1 , guide structures constituted by the guide ribs  36  of the slide holder  3  and the guide grooves  16  of the protective walls  14  are provided with relief portions constituted by the tapered portions  17 ,  37 . As a result, in a state in which the slide holder  3  is inclined with respect to the housing  2  so as to avoid interference of the locking structures constituted by the protrusion  22  of the housing  2  and the protrusion  35  of the slide holder  3 , the slide holder  3  can be smoothly mounted on the housing  2  and locked in the temporary locking position by using the guide structures without the interference of the locking structures. As a result, an engagement margin of the locking structures (the protrusion  22  and the protrusion  35 ) can be increased, and the slide holder  3  can be more reliably locked in the temporary locking position. 
     &lt;Other Embodiments&gt; 
     The present invention is not limited to the above embodiment, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the above-described embodiment, and can be appropriately modified, improved or the like. In addition, materials, shapes, sizes, numbers, arrangement places or the like of constituent elements in the above embodiment are optional and not limited as long as the object of the present invention can be achieved. 
     In the above embodiment, the notch  21  is provided so as to be recessed forward on the rear end surface of each protective wall  14 . In contrast, the notch can be provided at any position of the protective wall  14  as long as the part of the slide holder  3  is visible when the slide holder  3  is in the temporary locking position, and the part of the slide holder  3  is invisible when the slide holder  3  is in the main locking position. 
     Further, in the above embodiment, the guide structures constituted by the guide ribs  36  of the slide holder  3  and the guide grooves  16  of the protective walls  14  are provided with the relief portions constituted by the tapered portions  17 ,  37 , but the relief portion may not be provided. Further, the guide structures may be configured by guide grooves of the slide holder  3  and guide ribs of the protective wall  14 . 
     Further, characteristics of the embodiment of the connector  1  according to the present invention described above will be briefly summarized in the following [1] and [2]. 
     [1] A connector ( 1 ) comprising:
         a housing ( 2 ); and   a slide holder ( 3 ),   wherein the housing ( 2 ) includes a lock portion ( 18 ) maintaining a completely fitted state with a mating housing,   wherein the slide holder ( 3 ) that is configured to be mounted on the housing ( 2 ) so as to be movable in a fitting direction of the housing ( 2 ) and the mating housing between a temporary locking position and a main locking position, and is movable from the temporary locking position to the main locking position while avoiding interference with the lock portion ( 18 ) only in the completely fitted state,   wherein the housing ( 2 ) includes a pair of protective walls ( 14 ) extending in the fitting direction so as to sandwich the lock portion ( 18 ) and the slide holder ( 3 ) in a width direction orthogonal to the fitting direction, and   wherein the protective wall ( 14 ) includes a notch ( 21 ) which makes a part of the slide holder ( 3 ) visible when the slide holder ( 3 ) is in the temporary locking position, and makes the part of the slide holder ( 3 ) invisible when the slide holder ( 3 ) is in the main locking position when viewed from the width direction.       

     [2] The connector ( 1 ) according to the above [1],
         wherein the housing ( 2 ) and the slide holder ( 3 ) include locking structures ( 22 ,  35 ) for locking the slide holder ( 3 ) in the temporary locking position,   wherein the slide holder ( 3 ) and the pair of protective walls ( 14 ) include guide structures ( 16 ,  36 ) that guide the movement of the slide holder ( 3 ) with respect to the housing ( 2 ), and   wherein the guide structures ( 16 ,  36 ) have relief portions ( 17 ,  37 ) for making the slide holder ( 3 ) inclined with respect to the housing ( 2 ) in a direction in which the interference of the locking structures ( 22 ,  35 ) is avoided when the slide holder ( 3 ) is mounted on the housing ( 2 ).       

     REFERENCE SIGNS LIST 
       1  connector 
       2  housing 
       3  slide holder 
       14  protective wall 
       16  guide groove (guide structure) 
       17  tapered portion (relief portion) 
       18  lock portion 
       21  notch 
       22  protrusion (locking structure) 
       35  protrusion (locking structure) 
       36  guide rib (guide structure) 
       37  tapered portion (relief portion)