Patent Publication Number: US-11387589-B2

Title: Terminal

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a national phase of PCT application No. PCT/JP2019/001624, filed on 21 Jan. 2019, which claims priority from Japanese patent application Nos. 2018-119823 and 2018-170432 filed on 25 Jun. 2018 and 12 Sep. 2018, respectively, all of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     A technique disclosed by this specification relates to a terminal. 
     BACKGROUND 
     A pin contact element described in Japanese National Publication of International Patent Application No. 2016-522550 (Patent Document 1 below) is known as an example of a conventional terminal. The pin contact element is shaped into a flat contact and includes a contact member and a contact protection member formed integrally to the contact member. The contact protection member covers an upper part and both side edges of the contact member, and a contact surface of the contact member is exposed to outside. 
     The pin contact element is provided in a connector element, which is provided with a housing molded integrally to the contact protection member. The housing is provided with a contact protection collar to surround the pin contact element, and an upper part of the contact protection collar is open. Further, a clearance between the contact protection collar and the pin contact element is such a clearance that a test finger cannot enter, thereby suppressing direct contact of the test finger with the contact surface of the contact member. 
     PRIOR ART DOCUMENT 
     Patent Document 
     Patent Document 1: JP 2016-522550A 
     SUMMARY OF THE INVENTION 
     Problems to be Solved 
     Since the contact protection member is molded integrally to the housing, the both side edges of the contact member are covered by the contact protection member, thereby causing a problem of enlarging a width of the pin contact element. 
     Means to Solve the Problem 
     A terminal disclosed in this specification is provided with a plate-like body portion made of metal and long in a front-rear direction, and a mounting portion connected to the body portion, a separate insulating member being mounted on the mounting portion, wherein the mounting portion is plate-like and projects forward from a front end surface of the body portion, and the insulating member is located forward of the front end surface of the body portion and covers at least parts of a front end surface of the mounting portion and the front end surface of the body portion. 
     Since the insulating member covers at least the parts of the front end surface of the mounting portion and the front end surface of the body portion, finger touch on metal parts (mounting portion and body portion) of the terminal from the front of the terminal is suppressed. Further, since the insulating member is separate from the housing into which the terminal is mounted, the insulating member needs not be extended to a resin portion of the housing via the body portion unlike a configuration in which an insulating member and a housing are integrally molded as before. Thus, a width of the terminal can be suppressed. 
     Further, the mounting portion may have a first inclined surface on a front end part of the mounting portion to thin a plate thickness toward the front end surface of the mounting portion, and the insulating member may include a first groove portion behind the insulating member to cover at least a part of the first inclined surface. 
     The first groove portion of the insulating member covers at least the part of the first inclined surface of the mounting portion, whereby an inner surface of the first groove portion contacts the first inclined surface when the insulating member is displaced in a thickness direction of the terminal. Thus, a displacement of the insulating member in the thickness direction of the terminal can be suppressed. 
     Further, the first groove portion may cover the entire first inclined surface in a width direction of the mounting portion. 
     The first groove portion covers the entire first inclined surface in the width direction of the mounting portion, whereby a displacement of the insulating member in the thickness direction of the terminal can be further suppressed as compared to a configuration in which the first groove portion covers a part of the first inclined surface in the width direction. 
     Further, out of both side end parts in the width direction of a plate surface of the mounting portion, the side end part on one side may have a second inclined surface thinning the plate thickness toward a side surface on the one side of the mounting portion and the side end part on another side may have a third inclined surface thinning the plate thickness toward a side surface on the other side of the mounting portion, and the insulating member may include a second groove portion configured to cover at least a part of the second inclined surface and a third groove portion configured to cover at least a part of the third inclined surface. 
     The second groove portion of the insulating member covers at least the part of the second inclined surface of the mounting portion and the third groove portion of the insulating member covers at least the part of the third inclined surface of the mounting portion, whereby an inner surface of the second groove portion contacts the second inclined surface and an inner surface of the third groove portion contacts the third inclined surface when the insulating member is displaced in the thickness direction of the terminal. Thus, a displacement of the insulating member in the thickness direction of the terminal can be suppressed. 
     Further, the second groove portion may cover the entire second inclined surface of the mounting portion in the front-rear direction, and the third groove portion may cover the entire third inclined surface of the mounting portion in the front-rear direction. 
     The second groove portion covers the entire second inclined surface in the front-rear direction, and the third groove portion covers the entire third inclined surface in the front-rear direction, whereby a displacement of the insulating member in the thickness direction of the terminal can be further suppressed as compared to a configuration in which the second groove portion covers a part of the second inclined surface in the front-rear direction and the third groove portion covers a part of the third inclined surface in the front-rear direction. 
     Further, a length in the width direction of the mounting portion may be set shorter than a length in the width direction of the body portion, the front end surface of the body portion may be composed of a first front end surface located on one widthwise side and a second front end surface located on another widthwise side across the mounting portion, the insulating member may be composed of a first insulating member to be mounted on the mounting portion from a side surface on the one side and a second insulating member to be mounted on the mounting portion from a side surface on the other side, out of both side surfaces in the width direction of the mounting portion, and the first and second insulating members may be joined to each other, the first insulating member may be shaped to be long in the front-rear direction, be located forward of the first front end surface of the body portion and cover at least a part of the first front end surface of the body portion, and the second insulating member may include a first covering portion shaped to be long in the front-rear direction, located forward of the second front end surface of the body portion and configured to cover at least a part of the second front end surface of the body portion and a second covering portion shaped to be long in the front-rear direction, located forward of the front end surface of the mounting portion and configured to cover the front end surface of the mounting portion. 
     For example, by mounting the first insulating member on the mounting portion from the side surface on the one side of the mounting portion, subsequently mounting the second insulating member on the mounting portion from the side surface on the other side of the mounting portion and further joining the first and second insulating members, the insulating member can be assembled with the mounting portion. Thus, quick assembly is possible as compared to a configuration in which an insulating member is formed on a mounting portion by insert molding (configuration in which metal parts of a terminal are set in a mold and resin is poured into the mold and cooled and solidified). Further, no dedicated mold is necessary, which contributes to a cost reduction. 
     Further, a sum of lengths in the width direction of the first and second insulating members mounted on the mounting portion is equal to or shorter than a length in the width direction of the body portion. 
     Since the sum of the lengths in the width direction of the first and second insulating members is equal to or shorter than the length in the width direction of the body portion, an overall width of the terminal can be suppressed. 
     Further, a first recess may be provided to be open in the side surface on the one side of the mounting portion, a first projection to be fit to the first recess may be provided to project on a surface of the first insulating member facing the side surface on the one side of the mounting portion and a displacement of the first insulating member in the front-rear direction may be restricted by fitting the first recess and the first projection, a second recess may be provided to be open in the side surface on the other side of the mounting portion, a second projection to be fit to the second recess may be provided to project on a surface of the first covering portion of the second insulating member facing the side surface on the other side of the mounting portion and a displacement of the second insulating member in the front-rear direction may be restricted by fitting the second recess and the second projection. 
     By fitting the first projection of the first insulating member to the first recess of the mounting portion and fitting the second projection of the second insulating member to the second recess of the mounting portion, the first projection of the first insulating member contacts an inner surface of the first recess of the mounting portion and the second projection of the second insulating member contacts an inner surface of the second recess of the mounting portion if the insulating member is going to be displaced in the front-rear direction. Thus, a displacement of the insulating member in the front-rear direction is restricted. 
     Further, the first insulating member and the second covering portion of the second insulating member may respectively have contact surfaces to be held in contact with each other, an opening may be provided in the contact surface of the first insulating member, a first projecting portion may be provided to project on the contact surface of the second covering portion of the second insulating member, and the first and second insulating members may be joined to each other by press-fitting the first projecting portion into the opening. 
     By press-fitting the first projecting portion of the first insulating member into the opening of the second insulating member, the first and second insulating members can be joined. 
     Further, a first inclined surface thinning the plate thickness toward the front end surface of the mounting portion may be provided on a front end part of the plate surface of the mounting portion, a first groove portion long in the width direction may be provided to be open in a rear surface of the second covering portion of the second insulating member, and an inner surface of the first groove portion may be in surface contact with the front end surface and the first inclined surface of the mounting portion. 
     Since the inner surface of the first groove portion is in surface contact of the front end surface and the first inclined surface of the mounting portion of the body portion, a displacement of the insulating member in the thickness direction of the terminal can be suppressed. 
     Further, a second inclined surface thinning the plate thickness toward the side surface on the one side of the mounting portion may be provided on a side end part on the one side, out of both side end parts in the width direction of the plate surface of the mounting portion, a second groove portion long in the front-rear direction may be provided to be open in a surface of the first insulating member facing the side surface on the one side of the mounting portion, an inner surface of the second groove portion may be in surface contact with the side surface on the one side of the mounting portion and the second inclined surface, a third inclined surface thinning the plate thickness toward the side surface on the other side of the mounting portion may be provided on the side end part on the other side, out of the both side end parts in the width direction of the plate surface of the mounting portion, a third groove portion long in the front-rear direction may be provided to be open in a surface of the first covering portion of the second insulating member facing the side surface on the other side of the mounting portion, and an inner surface of the third groove portion may be in surface contact with the side surface on the other side of the mounting portion and the third inclined surface. 
     Since the inner surface of the second groove portion of the first insulating member is in surface contact with the side surface on the one side of the mounting portion and the second inclined surface and the inner surface of the third groove portion of the first covering portion of the second insulating member is in surface contact with the side surface on the other side of the mounting portion and the third inclined surface, a displacement of the insulating member in the thickness direction of the terminal can be suppressed. 
     Further, a length in the width direction of the mounting portion may be set shorter than a length in the width direction of the body portion, the front end surface of the body portion may be composed of a first front end surface located on the one widthwise side and a second front end surface located on the other widthwise side across the mounting portion, the insulating member may be composed of a first insulating member shaped to be long in the front-rear direction, located forward of the first front end surface of the body portion and configured to cover at least a part of the first front end surface of the body portion, and a second insulating member integrally formed to the first insulating member, the second insulating member may include a first covering portion connected to the first insulating member, shaped to be long in the front-rear direction, located forward of the second front end surface of the body portion and configured to cover at least a part of the second front end surface of the body portion, and a second covering portion shaped to be long in the width direction, located forward of the front end surface of the mounting portion and configured to cover the front end surface of the mounting portion, the first insulating member may have a first facing surface facing a side surface on one side of the mounting portion and a first fitting portion may be provided on the first facing surface, the first covering portion of the second insulating member may have a second facing surface facing a side surface on another side of the mounting portion and a second fitting portion may be provided on the second facing surface, a third fitting portion to be fit to the second fitting portion may be provided on the side surface on the one side of the mounting portion, a fourth fitting portion to be fit to the second fitting portion may be provided on the side surface on the other side of the mounting portion, and a displacement of the insulating member in the front-rear direction may be restricted by fitting the first and third fitting portions and fitting the second and fourth fitting portions. 
     By fitting the first fitting portion of the first insulating member to the third fitting portion of the mounting portion and fitting the second fitting portion of the first covering portion of the second insulating member to the fourth fitting portion of the mounting portion, a displacement of the insulating member in the front-rear direction from the mounting portion is restricted and the detachment of the insulating member from the mounting portion is suppressed. 
     Further, the first fitting portion may serve as a first projection projecting toward the side surface on the one side of the mounting portion from the first facing surface, the second fitting portion may serve as a second projection projecting toward the side surface on the other side of the mounting portion from the second facing surface, the third fitting portion may serve as a first recess open in the side surface on the one side of the mounting portion and to be fit to the first projection, and the fourth fitting portion may serve as a fourth recess open in the side surface on the other side of the mounting portion and to be fit to the second projection. 
     By fitting the first projection of the first insulating member to the first recess of the mounting portion and fitting the second projection of the first covering portion of the second insulating member to the second recess of the mounting portion, a displacement of the insulating member in the front-rear direction from the mounting portion is restricted and the detachment of the insulating member from the mounting portion is suppressed. 
     Further, the first insulating member and the first covering portion of the second insulating member may be resiliently displaceable in the width direction. 
     Since the first insulating member and the first covering portion of the second insulating member are resiliently displaceable in the width direction, the first and second fitting portions of the insulating member can be displaced to the positions of the third and fourth fitting portions of the mounting portion by resiliently displacing the first insulating member and the first covering portion of the second insulating member in the width direction when the first and second fitting portions of the insulating member are fit to the third and fourth fitting portions of the mounting portion. Since the insulating member can be mounted on the mounting portion by being assembled in this way, easy mounting is possible as compared to the case where an insulating member is mounted on a mounting portion by insert molding. 
     Further, a first inclined surface thinning the plate thickness toward the front end surface of the mounting portion may be provided on the front end part of the plate surface of the mounting portion, a first groove portion long in the width direction may be provided to be open in a rear surface of the second covering portion, and an inner surface of the first groove portion may be in surface contact with the front end surface and the first inclined surface of the mounting portion. 
     Since the inner surface of the first groove portion is in surface contact with the front end surface and the first inclined surface of the mounting portion of the body portion, a displacement of the insulating member in the thickness direction of the terminal can be suppressed. 
     Further, the mounting portion may include a first mounting portion projecting forward from an end part on one side of the front end surface of the body portion and a second mounting portion projecting forward from an end part on another side of the front end surface of the body portion, the insulating member may include a second covering portion provided from the first mounting portion to the second mounting portion and configured to cover a front end surface of the first mounting portion, a front end surface of the second mounting portion and the front end surface of the body portion, and a second projecting portion projecting toward a gap between the first and second mounting portions from a rear surface of the second covering portion, a first fitting portion may be provided on one side surface and a second fitting portion may be provided on another side surface, out of both side surfaces in the width direction of the second projecting portion, a third fitting portion to be fit to the first fitting portion may be provided on a surface of the first mounting portion facing the one side surface of the second projecting portion, a fourth fitting portion to be fit to the second fitting portion may be provided on a surface of the second mounting portion facing the other side surface of the second projecting portion, and a displacement of the insulating member in the front-rear direction may be restricted by fitting the first fitting portion to the third fitting portion and fitting the second fitting portion to the fourth fitting portion. 
     By fitting the first fitting portion of the insulating member to the third fitting portion of the mounting portion and fitting the second fitting portion of the insulating member to the fourth fitting portion of the mounting portion, a displacement of the insulating member in the front-rear direction from the mounting portion is restricted and the detachment thereof from the mounting portion is suppressed. 
     Effect of the Invention 
     According to the terminal disclosed in this specification, it is possible to suppress a width of a plate-like terminal including an insulating member on a front end. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
         FIG. 1  is a perspective view of a terminal in a first embodiment. 
         FIG. 2  is an enlarged view near a mounting portion of the terminal in  FIG. 1 . 
         FIG. 3  is an enlarged view near the mounting portion of the terminal viewed from a width direction. 
         FIG. 4  is a front view of the terminal. 
         FIG. 5  is an exploded perspective view of the terminal. 
         FIG. 6  is an exploded view of the terminal viewed from a thickness direction. 
         FIG. 7  is an exploded front view of the terminal. 
         FIG. 8  is a perspective view of a first insulating member. 
         FIG. 9  is a view of the first insulating member viewed from the width direction. 
         FIG. 10  is a perspective view of a second insulating member. 
         FIG. 11  is a view of the second insulating member viewed from the width direction. 
         FIG. 12  is a front view of a terminal in a second embodiment. 
         FIG. 13  is a section along A-A in  FIG. 12 . 
         FIG. 14  is a view, corresponding to  FIG. 12 , showing a state where an insulating member is separated from a body portion. 
         FIG. 15  is an enlarged perspective view near a mounting portion of the terminal. 
         FIG. 16  is a view, corresponding to  FIG. 15 , showing the state where the insulating member is separated from the body portion. 
         FIG. 17  is an enlarged perspective view near a mounting portion of a terminal in a third embodiment. 
         FIG. 18  is a view, corresponding to  FIG. 17 , showing a state where an insulating member is separated from a body portion. 
         FIG. 19  is an enlarged perspective view near a mounting portion of a terminal in a fourth embodiment. 
         FIG. 20  is a view, corresponding to  FIG. 19 , showing a state where an insulating member is separated from a body portion. 
         FIG. 21  is an enlarged perspective view near a mounting portion of a terminal in a fifth embodiment. 
         FIG. 22  is a view, corresponding to  FIG. 21 , showing a state where an insulating member is separated from a body portion. 
         FIG. 23  is an enlarged perspective view near a mounting portion of a terminal in a sixth embodiment. 
         FIG. 24  is a view, corresponding to  FIG. 23 , showing a state where an insulating member is separated from a body portion. 
         FIG. 25  is an enlarged perspective view near a mounting portion of a terminal in a seventh embodiment. 
         FIG. 26  is a view, corresponding to  FIG. 25 , showing a state where an insulating member is separated from a body portion. 
     
    
    
     DETAILED DESCRIPTION TO EXECUTE THE INVENTION 
     First Embodiment 
     A plate terminal (terminal)  10  of a first embodiment is described with reference to  FIGS. 1 to 11 . In the following description, an upward direction of  FIG. 6  (Z direction of  FIG. 6 ) is referred to as a forward direction, which is a connecting direction of the plate terminal  10 , a downward direction of  FIG. 6  is referred to as a rearward direction, a rightward direction of  FIG. 6  (Y direction of  FIG. 6 ) is referred to as one width direction of the plate terminal  10 , and a leftward direction of  FIG. 6  is referred to as another width direction of the plate terminal  10 . Further, a rightward direction of  FIG. 3  (X direction of  FIG. 3 ) is referred to as one thickness direction of the plate terminal  10 , and a leftward direction of  FIG. 3  is referred to as another thickness direction of the plate terminal  10 . 
     The plate terminal  10  is mounted in a housing (not shown) made of resin and, as shown in  FIGS. 1 and 2 , composed of a body portion  12  made of metal and in the form of a plate long in a front-rear direction, a plate-like mounting portion  16  connected to the body portion  12  and projecting forward from a front end surface  14  of the body portion  12 , and a separate insulating member  18  to be mounted on the mounting portion  16 . The insulating member  18  is located forward of the front end surface  14  of the body portion  12 . Since the insulating member  18  is separate from the housing (not shown), into which the plate terminal  10  is mounted, as just described, the insulating member  18  needs not be extended to a resin portion of the housing via the body portion  12  as compared to a configuration in which an insulating member and a housing are integrally molded as before, wherefore a width of the body portion  12  can be suppressed. 
     As shown in  FIG. 5 , the front end surface  14  of the body portion  12  is composed of a first front end surface  14 A and a second front end surface  14 B. As shown in  FIG. 6 , a length L 1  in the width direction of the mounting portion  16  is set shorter than a length L 2  in the width direction of the body portion  12 , the first front end surface  14 A is on one widthwise side of the mounting portion  16  and the second front end surface  14 B is on another widthwise side of the mounting portion  16 . 
     As shown in  FIGS. 5 and 6 , a first side surface  20 , which is a side surface on the one widthwise side of the mounting portion  16 , is provided with a groove-like first recess  22 , and a second side surface  24 , which is a side surface on the other widthwise side of the mounting portion  16 , is provided with a groove-like second recess  26 . 
     As shown in  FIGS. 5, 6 and 7 , a first inclined surface  30  inclined toward a front end surface  28  of the mounting portion  16  is provided on a front end part of a plate surface of the mounting portion  16 . 
     A second inclined surface  32  inclined toward the first front end surface  20  of the mounting portion  16  is provided on a side end part on the one widthwise side of the plate surface of the mounting portion  16 . 
     A third inclined surface  34  inclined toward the second front end surface  24  of the mounting portion  16  is provided on a side end part on the other widthwise side of the plate surface of the mounting portion  16 . 
     The insulating member  18  is made of resin and, as shown in  FIG. 5 , composed of a first insulating member  36  to be mounted on the mounting portion  16  from the side of the first side surface  20  of the mounting portion  16  and a second insulating member  38  to be mounted on the mounting portion  16  from the side of the second side surface  24  of the mounting portion  16 . The first and second insulating members  36 ,  38  respectively include a contact surface  40 A and a contact surface  40 B to be held in contact with each other as shown in  FIG. 2 . 
     As shown in  FIGS. 8 and 9 , the first insulating member  36  is shaped to be long in the front-rear direction, and a side surface of the first insulating member  36  on the other widthwise side (side surface facing the first front end surface  20  of the mounting portion  16 ) is provided with a first projection  42  and a second groove portion  44 . 
     The first projection  42  is provided at a position corresponding to the first recess  22  of the mounting portion  16  as shown in  FIG. 6 , and the first projection  42  of the first insulating member  36  is fit to the first recess  22  of the mounting portion  16  as shown in  FIG. 2 . In this way, if the first insulating member  36  is going to be displaced in the front-rear direction, the first projection  42  comes into contact with an inner surface of the first recess  22 . Thus, a displacement of the first insulating member  36  in the front-rear direction is restricted. 
     The second groove portion  44  is provided at a position corresponding to the second inclined surface  32  and the first side surface  20  of the mounting portion  16  as shown in  FIG. 6 , and covers the entire second inclined surface  32  and the entire first side surface  20  of the mounting portion  16  in the front-rear direction as shown in  FIG. 2 . Further, an inner surface of the second groove portion  44  is provided to face the second inclined surface  32  and the first side surface  20  of the mounting portion  16  and in surface contact with the entire mounting portion  16  in the front-rear direction. In this way, a displacement of the first insulating member  36  in a thickness direction is suppressed. Further, since the inner surface of the second groove portion is in surface contact with the entire second inclined surface  32  of the mounting portion  16  in the front-rear direction, a contact area of the second groove portion  44  and the mounting portion  16  is larger as compared to a configuration in which an inner surface of a second groove portion is in contact with a part of a second inclined surface of a mounting portion, and a displacement of the first insulating member  36  in the thickness direction can be further suppressed. Note that the second groove portion  44  may be configured to cover parts of the second inclined surface  32  and the first side surface  20  of the mounting portion  16  as long as finger touch on the mounting portion  16  can be suppressed. For example, the second groove portion  44  may be configured to cover parts of the second inclined surface  32  and the first side surface  20  in the front-rear direction or may be configured to cover parts of the second inclined surface  32  and the first side surface  20  in a direction intersecting the front-rear direction. Further, the inner surface of the second groove portion  44  may contact a part of the second inclined surface  32  of the mounting portion  16 . 
     As shown in  FIGS. 8 and 9 , the contact surface  40 A of the first insulating member  36  is provided on a side surface on the other widthwise side, and an opening  46  is open in the contact surface  40 A. 
     As shown in  FIGS. 10 and 11 , the second insulating member  38  is composed of a first covering portion  48  shaped to be long in the front-rear direction and a second covering portion  50  shaped to be long in the width direction and projecting in the one width direction from the side surface of the first covering portion  48  on the one widthwise side. 
     As shown in  FIG. 6 , a side surface of the first covering portion  48  on the one widthwise side (side surface facing the second side surface  24  of the mounting portion  16 ) is provided with a second projection  52  and a third groove portion  54 . 
     The second projection  52  of the first covering portion  48  is provided at a position corresponding to the second recess  26  of the mounting portion  16  as shown in  FIG. 6 , and the second projection  52  of the first covering portion  48  is fit to the second recess  26  of the mounting portion  16  as shown in  FIG. 2 . In this way, if the second insulating member  38  is going to be displaced in the front-rear direction, the second projection  52  comes into contact with an inner surface of the second recess  26 . Thus, a displacement of the second insulating member  38  in the front-rear direction is restricted. 
     The third groove portion  54  of the first covering portion  48  is provided at a position corresponding to the third inclined surface  34  and the second side surface  24  of the mounting portion  16  as shown in  FIG. 6 , and covers the entire third inclined surface  34  and the entire second side surface  24  of the mounting portion  16  in the front-rear direction as shown in  FIG. 2 . Further, an inner surface of the third groove portion  54  is provided to face the third inclined surface  34  and the second side surface  24  of the mounting portion  16  and in surface contact with the entire mounting portion  16  in the front-rear direction. In this way, a displacement of the second insulating member  38  in the thickness direction is suppressed. Further, since the inner surface of the second groove portion  54  is in surface contact with the entire third inclined surface  34  of the mounting portion  16  in the front-rear direction, a contact area of the third groove portion  54  and the mounting portion  16  is larger as compared to a configuration in which an inner surface of a third groove portion is in contact with a part of a third inclined surface of a mounting portion, and a displacement of the second insulating member  38  in the thickness direction can be further suppressed. Note that the third groove portion  54  may be configured to cover parts of the third inclined surface  34  and the second side surface  24  of the mounting portion  16  as long as finger touch on the mounting portion  16  can be suppressed. For example, the third groove portion  54  may be configured to cover parts of the third inclined surface  34  and the second side surface  24  in the front-rear direction or may be configured to cover parts of the third inclined surface  34  and the second side surface  24  in a direction intersecting the front-rear direction. Further, the inner surface of the third groove portion  54  may contact a part of the third inclined surface  34  of the mounting portion  16 . 
     As shown in  FIGS. 10 and 11 , a first groove portion  56  long in the width direction is provided to be open in a rear surface of the second covering portion  50 . As shown in  FIG. 2 , the first groove portion  56  is provided at a position corresponding to the first inclined surface  30  of the mounting portion  16  and the front end surface  28  of the mounting portion  16 , and covers the entire first inclined surface  30  and the entire front end surface  28  of the mounting portion  16  in the width direction of the mounting portion  16 . Further, an inner surface of the first groove portion  56  is provided to face the first inclined surface  30  of the mounting portion  16  and the front end surface  28  of the mounting portion  16 , and in surface contact with the entire mounting portion  16  in the width direction. In this way, a displacement of the second insulating member  38  in the thickness direction is suppressed. Further, since the inner surface of the first groove portion  56  is in surface contact with the entire first inclined surface  30  of the mounting portion  16  in the width direction, a contact area of the first groove portion  56  and the mounting portion  16  is larger as compared to a configuration in which an inner surface of a first groove portion is in contact with a part of a first inclined surface of a mounting portion, and a displacement of the first insulating member  36  in the thickness direction can be further suppressed. Note that the first groove portion  56  may be configured to cover parts of the first inclined surface  30  and the front end surface  28  of the mounting portion  16  as long as finger touch on the mounting portion  16  can be suppressed. For example, the first groove portion  56  may be configured to cover parts of the first inclined surface  30  and the front end surface  28  in the front-rear direction or may be configured to cover parts of the first inclined surface  30  and the front end surface  28  in a direction intersecting the front-rear direction. Further, the inner surface of the first groove portion  56  may contact a part of the first inclined surface  30  of the mounting portion  16 . 
     As shown in  FIGS. 10 and 11 , the contact surface  40 B of the second insulating member  38  is provided on a side surface of the second covering portion  50  on the one widthwise side, and a first projecting portion  58  projects on the contact surface  40 B. As shown in  FIG. 2 , the first projecting portion  58  of the second insulating member  38  is press-fit into the opening  46  of the first insulating member  36  and the first and second insulating members  36 ,  38  are joined. Since the separate insulating member  18  is mounted by being assembled with the mounting portion  16  in this way, quick assembly is possible as compared to a configuration in which an insulating member is formed on a mounting portion by insert molding (configuration in which metal parts of the plate terminal  10  are set in a mold, resin is poured into the mold and cooled and solidified). Further, no dedicated mold is necessary, which can contribute to a cost reduction. 
     As shown in  FIG. 2 , a side surface  60  of the first insulating member  36  on the one widthwise side and a side surface  62  of the body portion  12  on the one widthwise side are flush with each other, and a side surface  64  of the second insulating member  38  on the other widthwise side and a side surface  66  of the body portion  12  on the other widthwise side are flush with each other. In this way, as shown in  FIGS. 4 and 6 , a sum L 3  of lengths in the width direction of the first and second insulating members  36 ,  38  is equal to the length L 2  in the width direction of the body portion  12  and an overall width of the plate terminal  10  can be suppressed. 
     As shown in  FIGS. 2 and 4 , the first insulating member  36  covers the entire first front end surface  14 A of the body portion  12  from front. Further, the first covering portion  48  of the second insulating member  38  covers the entire second front end surface  14  of the body portion  12  from front. Further, the second covering portion  50  of the second insulating member  38  covers the front end surface  28  of the mounting portion  16  from front. In this way, finger touch on metal parts (mounting portion  16  and body portion  12 ) of the plate terminal  10  from the front of the plate terminal  10  is suppressed. 
     As described above, according to this embodiment, since the insulating member  18  covers the parts of the front end surface  28  of the mounting portion  16  and the front end surface  14  of the body portion  12 , finger touch on the metal parts (mounting portion  16  and body portion  12 ) of the plate terminal (terminal)  10  from the front of the plate terminal (terminal  10 ) is suppressed. Further, since the insulating member  18  is separate from the housing into which the plate terminal (terminal)  10  is mounted, the insulating member  18  needs not be extended to the resin portion of the housing via the body portion  12  unlike a configuration in which an insulating member and a housing are integrally molded as before. Therefore, the width of the plate terminal (terminal)  10  can be suppressed. 
     Further, the insulating member  18  can be assembled with the mounting portion  16 , for example, by mounting the first insulating member  36  on the mounting portion  16  from the side of the first side surface (side surface on one side)  20  of the mounting portion  16 , subsequently mounting the second insulating member  38  on the mounting portion  16  from the side of the second side surface (side surface on another side)  24  of the mounting portion  16  and further joining the first and second insulating members  36 ,  38 . Thus, quick assembly is possible as compared to a configuration in which an insulating member is formed on a mounting portion by insert molding (configuration in which the metal parts of the plate terminal (terminal)  10  are set in a mold, resin is poured into the mold and cooled and solidified) as before. Further, no dedicated mold is necessary, which can contribute to a cost reduction. 
     Further, since the sum L 3  of the lengths in the width direction of the first and second insulating members  36 ,  38  is equal to or less than the length L 2  in the width direction of the body portion, the overall width of the plate terminal (terminal)  10  can be suppressed. 
     Further, by fitting the first projection  42  of the first insulating member  36  to the first recess  22  of the mounting portion  16  and fitting the second projection  52  of the second insulating member  38  to the second recess  26  of the mounting portion  16 , the first projection  42  of the first insulating member  36  contacts the inner surface of the first recess  22  of the mounting portion  16  and the second projection  52  of the second insulating member  38  contacts the inner surface of the second recess  26  of the mounting portion  16  if the insulating member  18  is going to be displaced in the front-rear direction. Therefore, a displacement of the insulating member  18  in the front-rear direction is restricted. 
     Further, the first and second insulating members  36 ,  38  can be joined by press-fitting the first projecting portion  58  of the second insulating member  38  into the opening  46  of the first insulating member  36 . 
     Further, since the inner surface of the first groove portion  56  is in surface contact with the front end surface  28  and the first inclined surface  30  of the mounting portion  16  of the body portion  12 , a displacement of the insulating member  18  in the thickness direction of the plate terminal (terminal)  10  can be suppressed. 
     Note that the first inclined surface  30  of the mounting portion  16  of the body portion  12  is preferably provided in the width direction of the entire mounting portion  16 , for example, as shown in  FIG. 5 . Similarly, the first groove portion  56  is also preferably provided in the entire mounting portion  16  in the width direction. The above configuration is preferable from the perspective of being able to secure a larger contact area of the first groove portion  56  and the first inclined surface  30 . 
     Note that being provided in the entire mounting portion  16  in the width direction means the formation of the first inclined surface  30  from one end side to another end side in the width direction of the mounting portion  16 , for example, in the case of the first inclined surface  30 . 
     Further, since the inner surface of the second groove portion  44  of the first insulating member  36  is in surface contact of the first side surface (side surface on the one side) and the second inclined surface  32  of the mounting portion  16  and the inner surface of the third groove portion  54  of the first covering portion  48  of the second insulating member  38  is in surface contact with the second end surface (side surface on the other side) and the third inclined surface  34 , a displacement of the insulating member  18  in the thickness direction of the plate terminal (terminal)  10  can be suppressed. 
     Note that the second and third inclined surfaces  32 ,  34  are preferably provided in the entire mounting portion  16  in the front-rear direction, for example, as shown in  FIG. 5 . Similarly, the second groove portion  44  and the third groove portion  54  are also preferably provided in the entire mounting portion  16  in the front-rear direction. The above configuration is preferable from the perspective of being able to secure a larger contact area of the second groove portion  44  and the second inclined surface  32  and a larger contact area of the third groove portion  54  and the third inclined surface  34 . 
     Second Embodiment 
     A plate terminal  10 A of a second embodiment is described with reference to FIGS.  12  to  16 . In the plate terminal  10 A, an insulating member  18 A is composed of one member unlike the plate terminal  10  of the first embodiment. 
     As shown in  FIGS. 15 and 16 , the plate terminal  10 A is composed of a body portion  12  made of metal and in the form of a plate long in the front-rear direction, a plate-like mounting portion  16 A connected to the body portion  12  and projecting forward from a front end surface  14  of the body portion  12 , and a separate insulating member  18  to be mounted on the mounting portion  16  from front. 
     A groove-like first recess  22  is provided in a first side surface  20 , which is a side surface on one widthwise side of the mounting portion  16 A, and a groove-like second recess  26  is provided in a second side surface  24 , which is a side surface on another other widthwise side of the mounting portion  16 A. 
     A first inclined surface  30  inclined toward a front end surface  28  of the mounting portion  16 A is provided on a front end part of a plate surface of the mounting portion  16 A. 
     The insulating member  18 A is composed of a first insulating member  36 A and a second insulating member  38 A integrally provided to the first insulating member  36 A. 
     The first insulating member  36 A is shaped to be long in the front-rear direction and mounted on the side of the side surface  20  on one side of the mounting portion  16 A, and a first projection  42  is provided to project on a side surface on the other widthwise side of the first insulating member  36 A. 
     The first projection  42  is provided at a position corresponding to the first recess  22  of the mounting portion  16 A. If the insulating member  18 A is mounted on the mounting portion  16 A, the first projection  42  is fit to the first recess  22  of the mounting portion  16 A. In this way, the first projection  42  comes into contact with an inner surface of the first recess  22  if the insulating member  18 A is going to be displaced in the front-rear direction. Thus, a displacement of the first insulating member  36 A in the front-rear direction is restricted. 
     As shown in  FIGS. 15 and 16 , the second insulating member  38 A is composed of a second covering portion  50  shaped to be long in the width direction and connected to an upper end part of the first insulating member  36 A and a first covering portion  48  projecting rearward from an end part of the second covering portion  50  on a side opposite to an end part connected to the first insulating member  36 A. 
     A second projection  52  is provided to project on a side surface on the one widthwise side of the first covering portion  48  (side surface facing the second side surface  24  of the mounting portion  16 A). 
     The second projection  52  is provided at a position corresponding to the second recess  26  of the mounting portion  16 A. If the insulating member  18 A is mounted on the mounting portion  16 A, the second projection  52  of the first covering portion  48  is fit to the second recess  26  of the mounting portion  16 A. 
     By fitting the first projection  42  to the first recess  22  and fitting the second projection  52  to the second recess  26 , the first projection  42  comes into contact with the inner surface of the first recess  22  and the second projection  52  comes into contact with the inner surface of the second recess  26  if the insulating member  18 A is going to be displaced in the front-rear direction. Thus, a displacement of the insulating member  18 A in the front-rear direction is restricted. 
     As shown in  FIG. 13 , a first groove portion  56  long in the width direction is provided to be open in a rear surface of the second covering portion  50 . The first groove portion  56  is provided at a position corresponding to the first inclined surface  30  of the mounting portion  16 A and the front end surface  28  of the mounting portion  16 A, and an inner surface of the first groove portion  56  is in surface contact with the first inclined surface  30  of the mounting portion  16 A and the front end surface  28  of the mounting portion  16 A. In this way, a displacement of the insulating member  18 A in the thickness direction is suppressed. 
     The first insulating member  36 A and the first covering portion  48  are resiliently displaceable in the width direction. In this way, when the insulating member  18 A is mounted on the mounting portion  16 A from front, the front end of the mounting portion  16 A contacts the rear end of the first insulating member  36 A and the rear end of the first covering portion  48 , and the first insulating member  36 A and the first covering portion  48  are resiliently displaced in directions separating from each other. In this state, the insulating member  18 A can be mounted on the mounting portion  16 A by being displaced rearward until the first projection  42  is fit to the first recess  42  and the second projection  52  is fit to the second recess  26 . Since the insulating member  18 A can be mounted on the mounting portion  16 A by being assembled as just described, easy mounting is possible as compared to the case where the insulating member  18 A is mounted on the mounting portion  16 A by insert molding. 
     Since the other components are the same as in the plate terminal  10  of the first embodiment, these components are denoted by the same reference signs as in the first embodiment and not described. 
     As described above, according to this embodiment, a displacement of the insulating member  18 A in the front-rear direction from the body portion  12  is restricted and the detachment of the insulating member  18 A from the body portion  12  is suppressed by fitting the first projection (first fitting portion)  42  of the first insulating member  36 A to the first recess (third fitting portion)  22  of the mounting portion  16 A and fitting the second projection (second fitting portion)  52  of the first covering portion  48  of the second insulating member  38 A to the second recess (fourth fitting portion)  26  of the mounting portion  16 A. 
     Further, a displacement of the insulating member  18 A in the front-rear direction from the body portion  12  is restricted and the detachment of the insulating member  18 A from the body portion  12  is suppressed by fitting the first projection  42  of the first insulating member  36 A to the first recess  22  of the mounting portion  16 A and fitting the second projection  52  of the first covering portion  48  of the second insulating member  38 A to the second recess  26  of the mounting portion  16 A. 
     Further, since the first insulating member  36 A and the first covering portion  48  of the second insulating member  38 A are resiliently displaceable in the width direction, the first projection (first fitting portion)  42  and the second projection (second fitting portion)  52  of the insulating member  18 A can be displaced to the positions of the first recess (third fitting portion)  22  and the second recess (fourth fitting portion)  26  of the mounting portion  16 A by resiliently displacing the first insulating member  36 A and the first covering portion  48  of the second insulating member  38 A when the first projection (first fitting portion)  42  and the second portion (second fitting portion  52 ) of the insulating member  18 A are fit to the first recess (third fitting portion)  22  and the second recess (fourth fitting portion)  26  of the mounting portion  16 A. Since the insulating member  18 A can be mounted on the mounting portion  16 A by being assembled in this way, easy mounting is possible as compared to the case where an insulating member is mounted on a mounting portion by insert molding. 
     Further, since the inner surface of the first groove portion  56  is in surface contact with the front end surface  28  and the first inclined surface  30  of the mounting portion  16 A of the body portion  12 , a displacement of the insulating member  18 A in the thickness direction of the plate terminal (terminal)  10 A can be suppressed. 
     Third Embodiment 
     A plate terminal  10 B of a third embodiment is described with reference to  FIGS. 17 and 18 . An insulating member  18 B of the plate terminal  10 B is composed of one member similarly to the plate terminal  10 A of the second embodiment, but mounted on a mounting portion  16 A by insert molding unlike the plate terminal  10 A of the second embodiment. 
     A first insulating member  36 B and a first covering portion  48 A of a second insulating member  38 B of the insulating member  18 B are configured not to be resiliently displaceable in the width direction unlike the plate terminal  10 A in the second embodiment, so that the insulating member  18 B is less likely to be detached from the mounting portion  16 A than in the plate terminal  10 A of the second embodiment. 
     Fourth Embodiment 
     A plate terminal  10 C of a fourth embodiment is described with reference to  FIGS. 19 and 20 . An insulating member  18 C of the plate terminal  10 C is mounted on a mounting portion  16 B by insert molding similarly to the plate terminal  10 B of the third embodiment, but the shapes of the insulating member  18 C and the mounting portion  16 B are different from those of the insulating member  18 B and the mounting portion  16 A in the third embodiment. 
     The mounting portion  16 B is composed of a first mounting portion  68  projecting forward from an end part on one widthwise side of a front end surface  14  of a body portion  12  and a second mounting portion  70  projecting forward from an end part on another widthwise side of the front end surface  14  of the body portion  12 . The first and second mounting portions  68 ,  70  are disposed at a predetermined interval in the width direction. 
     The insulating member  18 C is composed of a second covering portion  50 A shaped to be long in the width direction, provided from the first mounting portion  68  to the second mounting portion  70  and configured to cover front end surfaces  28  of the first and second mounting portions  68 ,  70  and the front end surface  14  of the body portion  12 , and a second projecting portion  72  projecting toward a gap between the first and second mounting portions  68  and  70  from the rear surface of the second covering portion  50 . 
     Out of both side surfaces in the width direction of the second projecting portion  72 , a first projection (first fitting portion)  42 A is provided to project on a side surface  60 A on one side and a second projection (second fitting portion)  52 A is provided to project on a side surface  64 A on another side. 
     A first recess (third fitting portion)  22 A to be fit to the first projection  42 A is provided in a first side surface  20 A of the first mounting portion  68  facing the side surface  60 A on the one side of the second projecting portion  72 , and a second recess (fourth fitting portion)  26 A to be fit to the second projection (second fitting portion)  52 A is provided in a surface  24 A of the second mounting portion  70  facing the side surface  64 A on the other side of the second projecting portion  72 . By fitting the first projection  42 A and the first recess  22 A and fitting the second projection  52 A and the second recess  26 A, a displacement of the insulating member  18 C in the front-rear direction from the mounting portion  16 B is restricted and the detachment of the insulating member  18 C from the mounting portion  16 B is suppressed. 
     Since the other components are the same as in the plate terminal  10 B of the third embodiment, these components are denoted by the same reference signs as in the third embodiment and not described. 
     As described above, according to this embodiment, a displacement of the insulating member  18 C in the front-rear direction from the mounting portion  16 B is restricted and the detachment thereof from the mounting portion  16 B is suppressed by fitting the first projection (first fitting portion)  42 A of the insulating member  18 C to the first recess (third fitting portion)  22 A of the mounting portion  16 B and fitting the second projection (second fitting portion)  52 A of the insulating member  18 C to the second recess (fourth fitting portion)  26 A of the mounting portion  16 B. 
     Fifth Embodiment 
     A plate terminal  10 D of a fifth embodiment is described with reference to  FIGS. 21 and 22 . The plate terminal  10 D differs from the plate terminal  10 C of the fourth embodiment in that an insulating member  18 D is mounted on a mounting portion  16 C by press-fitting. 
     The mounting portion  16 C is composed of a first mounting portion  68 A projecting forward from an end part on one widthwise side of a front end surface  14  of a body portion  12  and a second mounting portion  70 A projecting forward from an end part on another widthwise side of the front end surface  14  of the body portion  12 . The first and second mounting portions  68 A,  70 A are disposed at a predetermined interval in the width direction. A pair of protrusions  76  are provided to project on a first side surface  20 B and a second side surface  24 B of the first and second mounting portions  68 A,  70 A facing each other. 
     The insulating member  18 D is composed of a second covering portion  50 A shaped to be long in the width direction, provided from the first mounting portion  68 A to the second mounting portion  70 A and configured to cover front end surfaces  28  of the first and second mounting portions  68 A,  70 A and the front end surface  14  of the body portion  12 , and a second projecting portion  72 A projecting toward a gap between the first and second mounting portions  68 A and  70 A from the rear surface of the second covering portion  50 . 
     A length between the tips of the pair of protrusions  76  is shorter than a length in the width direction of the second projecting portion  72 A of the insulating member  18 D, and the insulating member  18 D is mounted on the mounting portion  16 C by press-fitting. 
     Since the other components are the same as in the plate terminal  10 C of the fourth embodiment, these components are denoted by the same reference signs as in the fourth embodiment and not described. 
     Sixth Embodiment 
     A plate terminal  10 E of a sixth embodiment is described with reference to  FIGS. 23 and 24 . The plate terminal  10 E differs from the plate terminal  10 B of the third embodiment in that an insulating member  18 E is mounted on a mounting portion  16 D by press-fitting. 
     The mounting portion  16 D is provided to project forward from a front end surface  14  of a body portion  12 , and a pair of protrusions  76 A are provided to project on a first side surface  20  on one side and a second side surface  24  on another side of the mounting portion  16 D. 
     The insulating member  18 E is composed of a first insulating member  36 C and a second insulating member  38 C integrally provided to the first insulating member  36 C. The first insulating member  36 C is shaped to be long in the front-rear direction, and mounted on the side of the first side surface  20  on the one side of the mounting portion  16 D. The second insulating member  38 C is composed of a second covering portion  50 B shaped to be long in the width direction and connected to an upper end part of the first insulating member  36 C and a first covering portion  48 B projecting rearward from an end part of the second covering portion  50 B on a side opposite to an end part connected to the first insulating member  36 C. 
     A length between the tips of the pair of protrusions  76 A is longer than a length between the first insulating member  36 C and the first covering portion  48 B of the second insulating member  38 C of the insulating member  18 E, and the insulating member  18 E is mounted on the mounting portion  16 D by press-fitting. 
     Since the other components are the same as in the plate terminal  10 B of the third embodiment, these components are denoted by the same reference signs as in the third embodiment and not described. 
     Seventh Embodiment 
     A plate terminal  10 F of a seventh embodiment is described with reference to  FIGS. 25 and 26 . The plate terminal  10 F is similar to the plate terminal  10 E of the sixth embodiment in that an insulating member  18 F is mounted on a mounting portion  16 E by press-fitting, but differs from the plate terminal  10 E of the sixth embodiment in that the mounting portion  18 F is provided with a fourth recess  82  to be fit to a third projection  80 . 
     The third projection  80  is provided between a first insulating member  36 C and a first covering portion  48 B of a second insulating member  38 C of the insulating member  18 F and projects rearward from the rear surface of the second covering portion  50 B. The fourth recess  82  is provided to be open at a position corresponding to the third projection  80  on the front end of the mounting portion  16 E. By providing the third projection  80  and the fourth recess  82 , positioning becomes easier in mounting the insulating member  18 F on the mounting portion  16 E and the insulating member  18 F can be easily mounted on the mounting portion  16 E as compared to the plate terminal  10 E of the sixth embodiment. 
     Since the other components are the same as in the plate terminal  10 E of the sixth embodiment, these components are denoted by the same reference signs as in the sixth embodiment and not described. 
     Other Embodiments 
     The technique disclosed by this specification is not limited to the described and illustrated embodiments. For example, the following various modes are also included. 
     (1) Although the first and second insulating members  36 ,  38  are joined by press-fitting the first projecting portion  58  of the second covering portion  50  of the second insulating member  38  into the opening  46  of the first insulating member  36  in the first embodiment, a first insulating member and a second insulating member may be, for example, joined by welding or ultrasonic bonding. 
     (2) Although a displacement of the first insulating member  36  in the front-rear direction is restricted by fitting the first projection  42  provided on the first insulating member  36  to the first recess  22  provided in the mounting portion  16  in the first embodiment, a recess may be provided in a first insulating member, a projection may be provided on a mounting portion and the recess of the first insulating member may be fit to the projection of the mounting portion. 
     (3) Although a displacement of the second insulating member  38  in the front-rear direction is restricted by fitting the second projection  52  provided on the second insulating member  38  to the second recess  26  provided in the mounting portion  16  in the first embodiment, a recess may be provided in a second insulating member, a projection may be provided on a mounting portion and the recess of the second insulating member may be fit to the projection of the mounting portion. 
     (4) Although the first insulating member  36  is mounted from the side of the first side surface  20  of the mounting portion  16  and the second insulating member  38  is mounted from the side of the second side surface  24  of the mounting portion  16  in the first embodiment, one insulating member may be mounted on a mounting portion by press-fitting. 
     (5) Although the first and second insulating members  36 ,  38  are configured to cover the entire first and second front end surfaces  14 A,  14 B of the body portion  12  in the first embodiment, the first and second insulating members  36 ,  38  may cover parts of the first and second front end surfaces  14 A,  14 B. 
     (6) Although the length L 2  in the width direction of the body portion is equal to the sum L 3  of the lengths in the width direction of the first and second insulating members  36 ,  38  in the first embodiment, L 3  may be shorter than L 2 . 
     (7) Although the insulating member  18  is composed of the first and second insulating members  36 ,  38  in the first embodiment, there is no limitation to this. For example, a first insulating member and a second insulating member may constitute a unitary member. 
     LIST OF REFERENCE NUMERALS 
     
         
           10 ,  10 A,  10 B,  10 C,  10 D,  10 E,  10 F: plate terminal (terminal) 
           12 : body portion 
           14 : front end surface 
           14 A: first front end surface 
           14 B: second front end surface 
           16 ,  16 A,  16 B,  16 C,  16 D,  16 E: mounting portion 
           18 ,  18 A,  18 B,  18 C,  18 D,  18 E,  18 F: insulating member 
           20 ,  20 A,  20 B: first side surface (side surface on one side) 
           22 ,  22 A: first recess (third fitting portion) 
           24 ,  24 A,  24 B: second side surface (side surface on another side) 
           26 ,  26 A: second recess (fourth fitting portion) 
           28 : front end surface 
           30 : first inclined surface 
           32 : second inclined surface 
           34 : third inclined surface 
           36 ,  36 A,  36 B,  36 C: first insulating member 
           38 ,  38 A,  38 B,  38 C: second insulating member 
           40 A: contact surface 
           40 B: contact surface 
           42 ,  42 A: first projection (first fitting portion) 
           44 : second groove portion 
           46 : opening 
           48 ,  48 A,  48 B: first covering portion 
           50 ,  50 A,  50 B: second covering portion 
           52 ,  52 A: second projection (second fitting portion) 
           54 : third groove portion 
           56 : first groove portion 
           58 : first projecting portion 
           60 ,  60 A,  60 B: side surface on one side 
           62 : side surface on one side 
           64 ,  64 A,  64 B: side surface on another side 
           66 : side surface on another side 
           72 ,  72 A: second projecting portion 
         L 1 : length 
         L 2 : length