Patent Publication Number: US-2022219628-A1

Title: Wire harness routing device

Description:
TECHNICAL FIELD 
     The present specification discloses a technique relating to a wire harness routing device. 
     BACKGROUND 
     Conventionally, vehicles such as automobiles are provided with slidable seats, and these seats are equipped with electrical components such as an electric reclining device and a seat heater. Since a wire harness that connects these electrical components and devices or the like on the vehicle body side follows the sliding of the seat between the seat and the vehicle body, a configuration for absorbing the extra length of the wire harness is provided between the seat and the vehicle body. In Patent Document 1, a wire harness covered by a seat leg and a protector is slidably accommodated in a side space partitioning the inside of a seat rail under the seat. An extra-length absorption box is arranged at a position adjacent to the side portion of the seat rail, and the extra length portion of the wire harness when the seat leg slides is accommodated in the extra length absorption box in a state of being folded over in a U shape. 
     PRIOR ART DOCUMENT 
     Patent Document 
     
         
         Patent Document 1: JP 2013-049402 A 
       
    
     SUMMARY OF THE INVENTION 
     Problems to be Solved 
     Incidentally, in the configuration in which the wire harness is arranged in the rail for sliding the seat, there is concern that if the wire harness in the rail deviates from a predetermined routing path, the extra length portion of the wire harness will not be properly accommodated in the extra-length absorption box and thus the smooth sliding of the seat will be hindered. In Patent Document 1, the routing path of the wire harness in the seat rail is regulated by forming the side space in the seat rail, but if the side space is formed in the seat rail, there is a problem in that the internal shape of the seat rail will become complicated, and the space in the seat rail cannot be used efficiently. 
     Means to Solve the Problem 
     The wire harness routing device described in the present specification is a wire harness routing device including a rail in which an insertion hole through which a wire harness is to be inserted is formed, and a slider configured to perform a sliding movement together with the wire harness with respect to the rail, the wire harness routing device including a harness regulating portion that is arranged along the wire harness in the insertion hole, and is configured to regulate movement of the wire harness in a direction different from a direction of performing the sliding movement, and move in the insertion hole accompanying the sliding movement of the slider. 
     Effect of the Invention 
     According to the technique described in the present specification, it is possible to regulate the routing path of a wire harness in a rail. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view showing a harness routing device according to an embodiment. 
         FIG. 2  is a plan view showing a harness routing device in a state in which a slider is arranged on the rearward side of a rail. 
         FIG. 3  is a cross-sectional view taken along line A-A in  FIG. 2 . 
         FIG. 4  is a plan view showing the harness routing device in a state in which the slider is arranged on the frontward side of the rail. 
         FIG. 5  is a perspective view showing a state in which a guide member is fixed to the slider. 
         FIG. 6  is a perspective view showing a state in which a harness regulating portion is wound around a winding portion. 
         FIG. 7  is an exploded perspective view of the rail and an extra-length accommodation portion. 
     
    
    
     DETAILED DESCRIPTION TO EXECUTE THE INVENTION 
     Description of Embodiments of Present Disclosure 
     First, embodiments of the present disclosure will be listed and described. 
     (1) The wire harness routing device of the present disclosure is a wire harness routing device including a rail in which an insertion hole through which a wire harness is to be inserted is formed, and a slider configured to perform a sliding movement together with the wire harness with respect to the rail, the wire harness routing device including a harness regulating portion that is arranged along the wire harness in the insertion hole, and is configured to regulate movement of the wire harness in a direction different from a direction of performing the sliding movement, and move in the insertion hole accompanying the sliding movement of the slider. 
     According to the above configuration, the harness regulating portion can regulate the routing path of the wire harness in the rail. Also, since the harness regulating portion moves in the insertion hole accompanying the movement of the slider, it is possible to suppress a case in which the harness regulating portion becomes an obstacle to the movement of the slider. 
     (2) The harness regulating portion is elastically deformable in response to the movement of the slider, and an end portion of the harness regulating portion is fixed to the slider side. 
     In this manner, with a simple configuration, it is possible to regulate the routing path of the wire harness and suppress a case in which the harness regulating portion becomes an obstacle to the movement of the slider due to elastic deformation. 
     (3) A winding portion configured to wind the harness regulating portion is provided outside of the rail. 
     In this manner, the harness regulating portion can be accommodated on the outside of the rail with a simple configuration. 
     (4) An extra-length accommodation portion in which an extra length portion of the wire harness led out to the outside of the rail is accommodated is included, in which the wire harness is wound in a spiral shape with two or more turns in the extra-length accommodation portion. 
     In this manner, since the wire harness is accommodated in the extra-length accommodation portion in a spiral shape, for example, the length of the extra-length accommodation portion can be shortened compared to the configuration in which the wire harness is accommodated in a state of being folded over in a U shape in a long accommodation box. 
     (5) The wire harness includes a plurality of electric wires and an outer body for accommodating the plurality of electric wires, and the outer body is inserted through the rail in an orientation in which a vertical direction is longer than a width direction, and the harness regulating portion suppresses the wire harness from falling over. 
     If the wire harness is inserted into the rail in an orientation in which the vertical direction is longer than the width direction, the outer diameter of the portion where the path of the wire harness bends can be reduced and a smaller size can be achieved compared to the configuration in which the vertical direction is shorter than the width direction, but there is a problem in that the wire harness has a vertically elongated shape and easily falls over. According to the present configuration, even if the configuration is such that the wire harness easily falls over due to the orientation of the wire harness for achieving a smaller size, the harness regulating portion can suppress the wire harness from falling over. 
     Detailed Description of Embodiments of Disclosure 
     Specific examples of the substrate, component mounting substrate, and electrical connection box of the present disclosure will be described below with reference to the drawings. It should be noted that the present disclosure is not limited to these examples, but is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the claims. 
     Embodiment 
     An embodiment will be described with reference to  FIGS. 1 to 7 . 
     A wire harness routing device  10  of the present embodiment is fixed on a floor under a seat  60  in a vehicle such as an automobile (not shown), and a wire harness  11  connected to an electrical component of the seat  60  is routed therein. Hereinafter, the X direction in  FIG. 1  will be described as frontward, the Y direction as leftward, and the Z direction as upward. 
     As shown in  FIG. 1 , the seat  60  is slidable in the front-rear direction with respect to rails  20  fixed on the floor of a passenger compartment of a vehicle body (not shown) by bolting or the like. The seat  60  is provided with various electrical components such as an electric reclining device, a seat heater, a sensor for detecting whether or not an occupant is in the seat, and a sensor for detecting whether or not a seatbelt is worn. The lower portion of the seat  60  is fixed to sliders  26  in the rails  20  (only the slider  26  of one rail  20  is shown in  FIG. 1 , and the slider of the other rail  20  is omitted). 
     Wire Harness  11   
     The wire harness  11  is routed on the floor (under a mat, panel, etc.) or under the floor of the vehicle body, and is connected to a device such as an ECU (Electronic Control Unit) on the vehicle body side. Power is supplied and signals are transmitted and received between the device on the vehicle body side and the electrical components of the seat  60  via the wire harness  11 . 
     The wire harness  11  routed between the seat  60  and the vehicle body is inserted into (routed in) the rail  20  under the seat  60 . As shown in  FIG. 3 , the wire harness  11  includes a plurality of electric wires  12  (nine in the present embodiment) and an outer body  14  that collectively accommodates the plurality of electric wires  12 . Each electric wire  12  is a covered electric wire in which a metal conductor portion is covered with an insulating layer, and is connected to the various electrical components of the seat  60 . 
     The outer body  14  is made of, for example, an insulating synthetic resin, and extends in a band shape in the front-rear direction in a state of surrounding the plurality of electric wires  12 , which are aligned vertically. The outer body  14  includes a band-shaped outer main body  15  extending along the plurality of electric wires  12  and a band-shaped outer cover  16 , and the outer body  14  is curved only to one side (the extra-length accommodation portion  40  side) in the left-right direction due to a large number of slit-shaped notches  15 A (see  FIG. 6 ) being formed side by side in the outer body  15 . It should be noted that the wire harness  11  routed outside of the rail  20  and the extra-length accommodation portion  40  is routed in a state in which the plurality of electric wires  12  are not covered by the outer body  14 . 
     Wire Harness Routing Device  10   
     As shown in  FIGS. 2 and 4 , the wire harness routing device  10  includes a rail  20 , a slider  26  slidably arranged in the rail  20 , a harness regulating portion  30  that regulates the routing path of the wire harness  11 , and an extra-length accommodation portion  40  in which the extra length portion  11 A of the wire harness  11  is accommodated. 
     Rail  20   
     The rail  20  is made of metal, and as shown in  FIG. 1 , a pair of rails  20  are provided for each seat  60  and extend linearly in the front-rear direction. As shown in  FIG. 3 , each rail  20  has an insertion hole  21  through which the slider  26  is inserted, and which is formed through in the front-rear direction. The insertion hole  21  has a rectangular shape that is longer in the left-right direction, and a bottom groove  22  having a reduced width dimension on the downward side extends in the front-rear direction. Above the insertion hole  21 , a through groove  24  that communicates with the outside extends in a groove shape in the front-rear direction. 
     Slider  26   
     The slider  26  is made of, for example, a synthetic resin or a metal, and is slidable in the front-rear direction with respect to the rail  20 , and includes a slider main body  27  arranged in the insertion hole  21  and an attachment portion  28  that protrudes upward in the form of a plate from the upper surface of the slider main body  27 . The width of the slider main body  27  is larger than the interval of the through groove  24 . The attachment portion  28  slides between notches formed in the mat or the like on the floor, and is fastened to an attached portion (not shown) of the seat  60  by a fastening member (not shown) such as a bolt. Also, as shown in  FIG. 5 , a tubular guide member  17  through which a plurality of electric wires  12  are inserted is provided in front of the slider  26 , and a pair of extended attachment portions  17 C that are extended rearward of the guide member  17  are fixed to the attachment portion  28 . A through hole  17 D is formed through each of the extended attachment portions  17 C, and a shaft portion of a bolt serving as a fastening member is inserted through a fastening hole (not shown) and the through hole  17 D formed through the attachment portion  28 , and is fastened with a nut. The guide member  17  is made of a synthetic resin, and includes an outer body fixing portion  17 A that is connected to the rear end portion of the outer body  14  to position the outer body  14 , an outlet  17 B from which the plurality of electric wires  12  are guided upward, an insertion groove  18 A into which a metal fixing plate  31  at the rear end portion of the harness regulating portion  30  is inserted, and a pair of fixing member accommodation chambers  18 B in which a fixing member  19  is accommodated. The plurality of electric wires  12  extend rearward from the rear end portion of the outer body  14  behind the outer body fixing portion  17 A inside the guide member  17 . 
     The fixing member  19  has a circular columnar shape, and is made of, for example, a metal such as aluminum, an aluminum alloy, copper, a copper alloy, or iron, or a synthetic resin, has the same outer peripheral shape as a fixing hole  31 A, and is press-fit into the fixing hole  31 A of the metal fixing plate  31  to fix the position of the metal fixing plate  31  (rear end portion of the harness regulating portion  30 ). It should be noted that the fixing member  19  is not limited to this, and for example, the fixing member may be constituted by a bolt having a head portion that is larger than the fixing hole  31 A and a nut having an outer diameter that is larger than that of the fixing hole  31 A, and the shaft portion of the bolt may be fastened by the nut in a state in which the shaft portion is inserted into the fixing hole  31 A of the metal fixing plate  31 . The insertion groove  18 A has a gap with a predetermined dimension. The fixing member accommodation chambers  18 B are provided in the middle portion in the front-rear direction of the insertion groove  18 A, form a space into which the fixing member  19  can be inserted, and regulates movement in the front-rear direction of the fixing member  19  accommodated in the fixing member accommodation chambers  18 B. 
     Harness Regulating Portion  30   
     The harness regulating portion  30  is a thin, elastically-deformable leaf spring made of a band-shaped metal such as copper, a copper alloy, aluminum, or an aluminum alloy, and extends in the front-rear direction along the wire harness  11  in the insertion hole  21 . The leaf spring is bent with a constant curvature in the natural state, and the return force (load) generated when the leaf spring is stretched in a straight line is constant. As shown in  FIG. 5 , in the harness regulating portion  30 , a metal fixing plate  31  made of a metal thicker than the leaf spring is overlaid on the leaf spring at the rear end portion (one end side), and the metal fixing plate  31  is fixed to the leaf spring through a fixing means such as welding. The circular fixing hole  31 A is formed through the metal fixing plate  31 , and the fixing member  19  press-fit into the fixing hole  31 A is locked to the guide member  17 , whereby the harness regulating portion  30  moves in the insertion hole  21  accompanying the sliding movement of the slider  26 . 
     As shown in  FIG. 6 , the front end side (other end side) of the harness regulating portion  30  is wound around a winding portion  32  arranged outside of the rail  20 . Since the harness regulating portion  30  extends along the wire harness  11  in the vicinity of the wire harness  11 , the harness regulating portion  30  regulates movement (positional misalignment) in the vertical direction and the left-right direction of the wire harness  11  in the rail  20 . 
     The winding portion  32  includes a cylindrical tubular portion  33  around which the harness regulating portion  30  is wound, and a pair of overhang portions  34  that project from the edge portion of the tubular portion  33  in a brim shape. The harness regulating portion  30  is elastically deformed and wound around the outer periphery of the tubular portion  33  between the pair of overhang portions  34 . For example, a support shaft portion  36  fixed to the floor of the vehicle or the extra-length accommodation portion  40  is inserted into the tubular portion  33 . The support shaft portion  36  is circular column-shaped and has an outer diameter smaller than the inner diameter of the tubular portion  33 , a head portion  36 A with an outer diameter larger than the inner diameter of the tubular portion  33  is formed on the leading end portion of the support shaft portion  36 , and the detachment of the winding portion  32  is regulated by this head portion  36 A. The winding portion  32  can rotate with respect to the support shaft portion  36 , and when the wire harness  11  and the harness regulating portion  30  slide in the same direction as the seat  60  accompanying the sliding of the seat  60 , the winding portion  32  rotates to the side of the moving direction of the wire harness  11  and the harness regulating portion  30 , and the harness regulating portion  30  is wound by the winding portion  32  by the distance moved by the harness regulating portion  30 . In the present embodiment, since the harness regulating portion  30  is in a wound state in the natural state, it is held in the wound state with respect to the outer peripheral surface of the tubular portion  33  without using a fixing means. It should be noted that the relationship between the harness regulating portion  30  and the winding portion  32  is not limited to this, and for example, the end portion of the harness regulating portion  30  may also be fixed to the tubular portion  33  through a fixing means such as welding or adhesion. 
     The extra-length accommodation portion  40  accommodates the extra length portion  11 A of the wire harness  11  that is not accommodated in the rail  20 , and includes an accommodation portion main body  41  and a lid portion  55  as shown in  FIG. 7 . The accommodation portion main body  41  includes a flat plate-shaped bottom surface portion  42 , an accommodation wall  46  inside of which the wire harness  11  is accommodated in a spiral shape, and a guide wall  48  for guiding the wire harness  11  into the accommodating wall  46 . A lead-out portion  43  for leading the wire harness  11  to the floor, under the floor, or the like of the vehicle is formed in the middle portion of the bottom surface portion  42 . The lead-out portion  43  has a tubular shape that rises from the edge portion of the through hole  42 A (see  FIG. 2 ) formed in the bottom surface portion  42 , and as shown in  FIG. 7 , an insertion groove  44  into which the wire harness  11  is inserted has been cut out. The accommodating wall  46  rises in an annular shape from the bottom surface portion  42 , and forms an accommodation space for the wire harness  11  between the lead-out portion  43  and the accommodation wall  46 . The guide wall  48  guides the advancing direction of the wire harness  11  on the frontward side of the rail  20  in a direction bent toward the accommodation space in the accommodation wall  46  with respect to the front-rear direction. At a position adjacent to the outside of the accommodation wall  46 , a plurality of (three in this embodiment) retaining portions  50  to which the lid portion  55  can be screwed are formed. A screw hole is formed in each retaining portion  50 . 
     On the accommodation wall  46  side of the guide wall  48 , a recessed wall  52  in which the winding portion  32  is rotatably accommodated is provided. In the recessed wall  52 , a space in which the winding portion  32  is accommodated is ensured by cutting out the wall of the guide wall  48  in an arc shape. A rail fixing portion  54  is arranged below the bottom surface portion  42  rearward of the guide wall  48 . The rail fixing portion  54  has an inverted U shape, and a fastening hole  54 A through which the end portion of the rail  20  can be fastened with a bolt is formed through the upper surface portion. In a state in which the rail  20  is fixed on the rail fixing portion  54 , the inner wall (hole wall) of the insertion hole  21  of the rail  20  is continuous with the inner surface of the guide wall  48  and the upper surface of the bottom surface portion  42 . 
     The lid portion  55  has a flat plate shape corresponding to the shape of the accommodation portion main body  41 , a protrusion  56  protruding upward in a circular shape is formed at a position corresponding to the winding portion  32  in the lid portion  55 , and a circular recess (not shown) into which the upper end portion of the winding portion  32  fits is formed on the lower surface side of the protrusion  56 . A plurality of screw holes  57  through which shaft portions of screws for screwing to the retaining portions  50  of the accommodation portion main body  41  can be inserted are formed through the lid portion  55 . A peripheral wall  58  that covers the outside of the upper end portion of the accommodation portion main body  41  is formed on the peripheral edge portion of the lid portion  55 . 
     Next, operations performed when the seat  60  is slid will be described. 
     When the seat  60  is on the rearward side of the rail  20  (the state shown in  FIG. 2 ), the band-shaped harness regulating portion  30  is in a state of extending linearly in the rail  20 . As shown in  FIG. 3 , the harness regulating portion  30  in this state is arranged between the inner wall of the rail  20  and the harness regulating portion  30 , and therefore positional misalignment of the routing path of the wire harness  11 , falling over of the wire harness  11 , and the like are regulated by the harness regulating portion  30 . Also, since the harness regulating portion  30  in this state is deformed from the natural state, an elastic repulsive force (toward the hole wall  21 A side on the lateral side of the insertion hole  21 ) is generated, and if the routing path is bent due to flexure or the like occurring in the wire harness  11 , the harness regulating portion  30  comes into contact with the wire harness  11  and the wire harness  11  can be held between the hole wall  21 A on the lateral side of the insertion hole  21  and the harness regulating portion  30 . 
     Next, when the user slides the seat  60  frontward, the slider  26  and the wire harness  11  slide frontward, and the harness regulating portion  30  in the rail  20  slides frontward (the state in  FIG. 4 ). At this time, the harness regulating portion  30  led out to the front of the rail  20  is wound by the rotating winding portion  32  and is wound while being elastically restored (see  FIG. 6 ). 
     Next, when the user slides the seat  60  rearward from this state, the slider  26  and the wire harness  11  slide rearward, and the harness regulating portion  30  in the rail  20  slides rearward (the state in  FIG. 2 ). At this time, the harness regulating portion  30  on the frontward side of the rail  20  is rewound while being elastically deformed by the winding portion  32  rotating on the opposite side, and is in a linearly extended state. 
     According to this embodiment, the following operations and effects are exhibited. 
     According to the present embodiment, a wire harness routing device  10  includes a rail  20  in which an insertion hole  21  through which a wire harness  11  is to be inserted is formed, and a slider  26  configured to perform a sliding movement together with the wire harness  11  with respect to the rail  20 , the wire harness routing device  10  including a harness regulating portion  30  that is arranged along the wire harness  11  in the insertion hole  21 , regulates the movement of the wire harness  11  in a direction different from the front-rear direction (direction of performing the sliding movement), and moves in the insertion hole  21  accompanying the sliding movement of the slider  26 . 
     According to the present embodiment, the harness regulating portion  30  can regulate the routing path of the wire harness  11  in the rail  20 . Also, since the harness regulating portion  30  moves in the insertion hole  21  accompanying the movement of the slider  26 , it is possible to suppress a case in which the harness regulating portion  30  becomes an obstacle to the movement of the slider  26 . 
     Also, the harness regulating portion  30  is elastically deformable in response to the movement of the slider  26 , and an end portion of the harness regulating portion  30  is fixed to the slider  26  side. 
     By doing so, with a simple configuration, it is possible to regulate the routing path of the wire harness  11  while preventing the harness regulating portion  30  from becoming an obstacle to the movement of the slider  26  due to elastic deformation. 
     Also, a winding portion  32  for winding the harness regulating portion  30  is provided outside of the rail  20 . 
     By doing so, the harness regulating portion  30  can be accommodated outside of the rail  20  with a simple configuration. 
     Also, an extra-length accommodation portion  40  in which the extra length portion  11 A of the wire harness  11  led out to the outside of the rail  20  is accommodated is provided, and the wire harness  11  is wound in a spiral shape with two or more turns in the extra-length accommodation portion  40 . 
     By doing so, the wire harness  11  is accommodated in the extra-length accommodation portion  40  in a spiral shape, and therefore, for example, it is possible to shorten the length of the extra-length accommodation portion  40  compared to a configuration in which the wire harness  11  is accommodated in a long accommodation box in a state of being folded over in a U shape. 
     Also, the wire harness  11  includes a plurality of electric wires  12  and an outer body  14  for accommodating the plurality of electric wires  12 , the outer body  14  is inserted through the rail  20  in an orientation in which the vertical direction is longer than the width direction, and thus the harness regulating portion  30  suppresses the wire harness  11  from falling over. 
     If the wire harness  11  is inserted into the rail  20  in an orientation in which the vertical direction is longer than the width direction, the outer diameter of the portion where the path of the wire harness  11  bends can be reduced and a smaller size can be achieved compared to the configuration in which the vertical direction is shorter than the width direction, but there is a problem in that the wire harness  11  will have a vertically elongated shape and easily fall over. According to the present embodiment, even if a configuration is used in which falling over is likely to occur due to the orientation of the wire harness  11  for achieving a smaller size, the harness regulating portion  30  can suppress the wire harness  11  from falling over. 
     OTHER EMBODIMENTS 
     The technique described in the present specification is not limited to the embodiments described in the above description and the drawings, and for example, the following embodiments are also included in the technical scope of the technique described in the present specification. 
     (1) The number of turns of the wire harness  11  in the extra-length accommodation portion  40  is not limited to the number of turns of the above embodiment, and may be a different number of turns. Also, the number of turns in the extra-length accommodation portion  40  before and after the sliding of the slider  26  is not limited to the configuration in which the number of turns changes according to the position (position in the slide direction) of the seat  60  or the slider  26 , and it is also possible to use a configuration in which the number of turns does not change depending on the position of the seat  60  or the slider  26  (a configuration in which only the interval between adjacent wire harnesses  11  in the spiral wire harness  11  changes). 
     (2) The harness regulating portion  30  was an elastic body, but there is no limitation to this. For example, the harness regulating portion may also be made of resin or fiber. 
     (3) The winding portion  32  may also be arranged at a different position. For example, the front end side of the harness regulating portion may be fixed to the rail  20 , and a winding portion  32  that can rotate may be fixed to the rear end side (slider  26  side) of the harness regulating portion. 
     (4) The number of electric wires  12  included in the wire harness  11  is not limited to the number of the above-described embodiment, and can be changed to various numbers. For example, the wire harness  11  may include one electric wire  12 . Also, the outer body  14  that protects the electric wire  12  is not limited to the shape of the above embodiment, and can be changed in various ways. Also, for example, the wire harness  11  may include only the electric wires  12  without using the outer body  14 . 
     (5) The slider  26  is fixed to the seat  60  as a slid object, but the present invention is not limited to this. For example, the slider  26  may be fixed to a slide door with the slide door as the slid object. 
     LIST OF REFERENCE NUMERALS 
     
         
         
           
               10  Wire harness routing device 
               11  Wire harness 
               11 A Extra length portion 
               12  Electric wire 
               14  Outer body 
               15  Outer main body 
               15 A Notch 
               16  Outer cover 
               17  Guide member 
               17 A Outer body fixing portion 
               17 B Lead-out port 
               17 C Extended attachment portion 
               17 D Through hole 
               18 A Insertion groove 
               18 B Fixing member accommodation chamber 
               19  Fixing member 
               20  Rail 
               21  Insertion hole 
               21 A Hole wall on lateral side 
               22  Bottom groove 
               24  Through groove 
               26  Slider 
               27  Slider main body 
               28  Attachment portion 
               30  Harness regulating portion 
               31  Metal fixing plate 
               31 A Fixing hole 
               32  Winding portion 
               33  Tubular portion 
               34  Overhang portion 
               36  Support shaft portion 
               36 A Head portion 
               40  Extra-length accommodation portion 
               41  Accommodation portion main body 
               42  Bottom wall portion 
               42 A Through hole 
               43  Lead-out portion 
               44  Insertion groove 
               46  Accommodation wall 
               48  Guide wall 
               50  Retaining portion 
               52  Recessed wall 
               54  Rail fixing portion 
               54 A Fastening hole 
               55  Lid portion 
               56  Protrusion 
               57  Screw hole 
               58  Peripheral wall 
               60  Seat