Patent Publication Number: US-2022231442-A1

Title: Terminal fitting

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based on and claims priority from Japanese Patent Application No. 2021-005550, filed on Jan. 18, 2021, with the Japan Patent Office, the disclosure of which is incorporated herein in their entireties by reference. 
     TECHNICAL FIELD 
     The present disclosure relates to a terminal fitting. 
     BACKGROUND 
     Conventionally, a terminal fitting is known which includes a tubular body portion. A tab portion of a mating terminal fitting is inserted into the body portion from front. For example, a body portion of a terminal fitting described in Japanese Patent Laid-open Publication No. 2014-082158 includes three resilient contact pieces. The three resilient contact pieces are arranged side by side in a lateral direction. The three resilient contact pieces are independently resiliently displaced in a vertical direction. A contact point portion is provided on the upper surface of each resilient contact piece. Out of three contact point portions  21 ,  22 , the one in a lateral center contacts a tip side of the tab portion. Out of the three contact point portions  21 ,  22 , those on both lateral sides contact the tab portion on a side more rearward than the contact point portion in the middle. The tab portion is supported by the three contact point portions  21 ,  22 , whereby the rattling of the tab portion in the body portion is suppressed. 
     SUMMARY 
     If the tip side of the tab portion of the mating terminal fitting is displaced downward (in a direction to press the contact point portion) with the terminal fitting and the mating terminal fitting connected, contact loads of the contact point portions on the rear side are reduced. On the other hand, if the rear side of the tab portion of the mating terminal fitting is displaced downward, a contact load of the contact point portion on the tip side is reduced. To more reliably prevent the rattling of the tab portion in the body portion, there has been a demand to suppress such a reduction in contact load. 
     Accordingly, the present disclosure aims to provide a terminal fitting which can suppress a reduction in contact load even if a tab portion is displaced. 
     The present disclosure is directed to a terminal fitting with a tubular body portion, a first resilient piece and a second resilient piece provided inside the body portion, a first contact point portion provided on the first resilient piece, the first contact point portion contacting a tab portion of a mating terminal fitting, and a second contact point portion provided on the second resilient piece, the second contact point portion contacting the tab portion, wherein the first resilient piece extends in a first direction along a length direction of the tab portion from a first fixed end fixed to the body portion and is resiliently displaceable with a fulcrum of the first fixed end as a center, the second resilient piece extends in a second direction opposite to the first direction from a second fixed end fixed to the first resilient piece and is resiliently displaceable with a fulcrum of the second fixed end as a center, the first contact point portion is located on a side closer to a tip in the first direction of the first resilient piece than the fulcrum of the second fixed end, and the second contact point portion is located on a side closer to a tip in the second direction of the second resilient piece than the fulcrum of the first fixed end. 
     According to the present disclosure, a terminal fitting can be provided which can suppress a reduction in contact load even if a tab portion is displaced. 
     The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a terminal fitting according to an embodiment showing a state connected to a mating terminal fitting. 
         FIG. 2  is a front view showing a body portion in a state where a tab portion of the mating terminal fitting is inserted. 
         FIG. 3  is a plan view in section showing the inside of the body portion. 
         FIG. 4  is a perspective view partly in section showing the inside of the body portion. 
         FIG. 5  is a longitudinal section showing the inside of the body portion. 
         FIG. 6  is a development showing a developed state of the terminal fitting. 
         FIG. 7  is a section showing the inside of the body portion in a state where a tip side of the tab portion is displaced downward. 
         FIG. 8  is a section showing the inside of the body portion in a state where a rear side of the tab portion is displaced downward. 
         FIG. 9  is a plan view showing the inside of the body portion in a state where the tip side of the tab portion is displaced leftward. 
     
    
    
     DETAILED DESCRIPTION 
     In the following detailed description, reference is made to the accompanying drawings, which form a part hereof. The illustrative embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented here. 
     Description of Embodiments of Present Disclosure 
     First, embodiments of the present disclosure are listed and described. 
     (1) The terminal fitting of the present disclosure includes a tubular body portion, a first resilient piece and a second resilient piece provided inside the body portion, a first contact point portion provided on the first resilient piece, the first contact point portion contacting a tab portion of a mating terminal fitting, and a second contact point portion provided on the second resilient piece, the second contact point portion contacting the tab portion, wherein the first resilient piece extends in a first direction along a length direction of the tab portion from a first fixed end fixed to the body portion and is resiliently displaceable with a fulcrum of the first fixed end as a center, the second resilient piece extends in a second direction opposite to the first direction from a second fixed end fixed to the first resilient piece and is resiliently displaceable with a fulcrum of the second fixed end as a center, the first contact point portion is located on a side closer to a tip in the first direction of the first resilient piece than the fulcrum of the second fixed end, and the second contact point portion is located on a side closer to a tip in the second direction of the second resilient piece than the fulcrum of the first fixed end. 
     According to this configuration, if the tab portion is displaced in a direction to press the first contact point portion, the first resilient piece can be mainly resiliently displaced with the fulcrum of the first fixed end as a center and the second contact point portion can be displaced toward the tab portion like a seesaw. Thus, a reduction in the contact load of the tab portion and the second contact point portion can be suppressed. On the other hand, if the tab portion is displaced in a direction to press the second contact point portion, the second resilient piece can be mainly resiliently displaced with the fulcrum of the second fixed end as a center and the first contact point portion can be displaced toward the tab portion like a seesaw. Thus, a reduction in the contact load of the tab portion and the first contact point portion can be suppressed. Therefore, even if the tab portion is displaced, a reduction in contact load can be reduced. 
     (2) Preferably, the first resilient piece includes a plurality of extending portions extending in the first direction and a linking portion linking tip sides in the first direction of the plurality of extending portions, and a plurality of the first contact point portions are provided on the linking portion. According to this configuration, since an interval between the first contact point portions can be made smaller than that between the extending portions of the first resilient piece, a tab portion having a small width can be dealt with. 
     (3) Preferably, the body portion includes side walls arranged on both sides of the tab portion in a direction intersecting the length direction, and the side walls include projecting portions projecting toward the first and second resilient pieces. According to this configuration, if the tip side of the tab portion swings in the direction intersecting the length direction, a side edge of the tab portion contacts the projecting portion and a contact point of the side edge of the tab portion and the projecting portion can serve as a center of a swinging movement of the tip of the tab portion. In this way, distances between the respective contact points and the center of the swinging movement can be larger than those when a center of a swinging movement of a tab portion is located inside a plurality of contact point portions. Therefore, a load necessary to swing the tip of the tab portion can be increased, wherefore the swinging movement of the tip of the tab portion can be suppressed. 
     Details of Embodiment of Present Disclosure 
     A specific example of a terminal fitting of the present disclosure is described below with reference to the drawings. Note that the present invention is not limited to these illustrations and is intended to be represented by claims and include all changes in the scope of claims and in the meaning and scope of equivalents. 
     As shown in  FIG. 1 , a terminal fitting T is connected to a mating terminal fitting  100 . The terminal fitting T is for large current. The terminal fitting T is a female terminal fitting, and the mating terminal fitting  100  is a male terminal fitting. The terminal fitting T and the mating terminal fitting  100  are formed by press-working a metal plate excellent in conductivity. The terminal fitting T and the mating terminal fitting  100  are respectively connected to ends of wires W. The terminal fitting T and the mating terminal fitting  100  include barrel portions  103  to be crimped to ends of the wires W. 
     The mating terminal fitting  100  includes a body portion  101  and a tab portion  102 . The tab portion  102  projects from the body portion  101 . The tab portion  102  is formed by folding a plate-like member extending from the body portion  101  into two (see  FIG. 2 ). The tab portion  102  is resiliently supported on a resilient piece  20  of the terminal fitting T. 
     In the following description, in each constituent member of the terminal fitting T, a forward direction side (side where the mating terminal fitting  100  is connected) of an X axis of  FIG. 1  is referred to as a front side, a negative direction side (side where the wire W is connected) of the X axis of  FIG. 1  is referred to as a rear side, a forward direction side (side where the tab portion  102  is arranged with respect to the resilient piece  20 ) of a Y axis of  FIG. 2  is referred to as an upper side, a negative direction side (side opposite to the side where the tab portion  102  is arranged with respect to the resilient piece  20 ) of the Y axis of  FIG. 2  is referred to as a lower side, a forward direction side (right side when the terminal fitting T is viewed from front) of a Z axis of  FIG. 2  is referred to as a right side, and a negative direction side (left side when the terminal fitting T is viewed from front) of the Z axis of  FIG. 2  is referred to as a left side. 
     As shown in  FIG. 2 , the terminal fitting T includes a body portion  10  into which the tab portion  102  is inserted. The body portion  10  is in the form of a rectangular tube open on both front and rear sides. The body portion  10  is shaped to have a width (dimension in the lateral direction) larger than a height (dimension in the vertical direction). A width of a front opening of the body portion  10  is larger than that of the tab portion  102 . 
     The body portion  10  includes a pair of left and right side walls  11 , an upper wall  12  and a lower wall  13 . The left and right side walls  11  are parallel. The left and right side walls  11  are arranged on both left and right sides (both sides in a direction intersecting a length direction) of the tab portion  102  with the terminal fitting T and the mating terminal fitting  100  connected. The upper and lower walls  12 ,  13  are parallel. Here, parallel may not be perfectly parallel. 
     The upper wall  12  includes two ridge portions  14 . One ridge portion  14  is provided on each of left and right sides of the body portion  10 . The pair of ridge portions  14  are bilaterally symmetrically arranged with respect to a lateral center position of the body portion  10 . The ridge portions  14  extend in a front-rear direction (see  FIG. 4 ). The two ridge portions  14  are parallel. Here, parallel may not be perfectly parallel. 
     As shown in  FIG. 3 , the side wall  11  includes a projecting portion  15  projecting toward the resilient piece  20  in the body portion  10 . The projecting portion  15  is formed by striking a part of the body portion  10 . The projecting portion  15  has a trapezoidal shape slightly projecting inwardly of the body portion  10 . The projecting portions  15  are provided on the both left and right side walls  11 . The projecting portions  15  extend in the front-rear direction. The projecting portions  15  are located on left and right sides of a region where the resilient piece  20  is arranged. The front ends of the projecting portions  15  are located near the front end of the resilient piece  20  in the front-rear direction. The rear ends of the projecting portions  15  are located rearward of the rear end of the resilient piece  20  in the front-rear direction. The projecting portions  15  are bilaterally symmetrical with respect to a lateral center of the body portion  10 . As shown in  FIG. 4 , the projecting portions  15  are formed in vertically central parts of the side walls  11 . The projecting portions  15  are located substantially at the same height as the tab portion  102  inserted into the body portion  10 . 
     As shown in  FIG. 3 , excessive deflection preventing portions  16  are provided inside the body portion  10 . A pair of left and right excessive deflection preventing portions  16  are provided. The excessive deflection preventing portions  16  are in the form of walls facing the side walls  11 . The excessive deflection preventing portions  16  are formed by forming cuts in the lower wall  13  and raising cut parts upward. The excessive deflection preventing portions  16  are located below the resilient piece  20 . A stabilizer  17  is provided behind the excessive deflection preventing portions  16 . The terminal fitting T is inserted in a correct direction into an unillustrated housing by the stabilizer  17 . 
     As shown in  FIG. 3 , the resilient piece  20  is provided inside the body portion  10 . The resilient piece  20  is resiliently displaced in the vertical direction inside the body portion  10 . The resilient piece  20  includes three contact point portions  21 ,  22 . The three contact point portions  21 ,  22  contact the tab portion  102 . Out of the three contact point portions  21 ,  22 , two are first contact point portions  21  and one is a second contact point portion  22 . The two first contact point portions  21  are laterally arranged side by side. The second contact point portion  22  is located forward of the first contact point portions  21 . A clearance smaller than a thickness (dimension in the vertical direction) of the tab portion  102  is formed between the three contact point portions  21 ,  22  and the ridge portions  14  of the upper wall  12  in a state where the resilient piece  20  is not resiliently displaced. 
     As shown in  FIG. 3 , the resilient piece  20  includes a first resilient piece  23  and a second resilient piece  24 . Since the first and second resilient pieces  23 ,  24  are integrally formed, a gap between the three contact point portions  21 ,  22  and the ridge portions  14  can be easily controlled. 
     The first resilient piece  23  includes two extending portions  23 A and a linking portion  23 B. The linking portion  23 B links rear end parts of the two extending portions  23 A to each other. The linking portion  23 B extends in the lateral direction. A width (dimension in the front-rear direction) of the linking portion  23 B is larger than a width (dimension in the lateral direction) of either one of the left and right extending portions  23 A. The extending portions  23 A of the first resilient piece  23  and the second resilient piece  24  are shaped to be long in the front-rear direction. The extending portions  23 A of the first resilient piece  23  and the second resilient piece  24  are arranged laterally side by side. The extending portions  23 A of the first resilient piece  23  and the second resilient piece  24  extend in parallel. Here, parallel may not be perfectly parallel. 
     As shown in  FIG. 5 , the extending portion  23 A of the first resilient piece  23  extends rearward (first direction) from a first fixed end  25  fixed to the body portion  10 . The extending portion  23 A extends obliquely upward from the first fixed end  25  in a state where the extending portion  23 A is not resiliently displaced. The first fixed end  25  is bent upward from the front edge of the lower wall  10  of the body portion  10 . The first fixed end  25  is curved into an arc shape. A fulcrum  25 P of the first fixed end  25  is a virtual point serving as a center of a resilient displacement of the first resilient piece  23 . Specifically, the fulcrum  25 P of the first fixed end  25  is a center point of the arched first fixed end  25 . The position of the fulcrum  25 P of the first fixed end  25  is not limited to the position shown in  FIG. 5 . The fulcrum  25 P of the first fixed end  25  can be located at the position shown in  FIG. 5  or near this position. For example, the fulcrum  25 P of the first fixed end  25  can be located in the plate constituting the first fixed end  25 . 
     A rear end part of the first resilient piece  23  is a free end. The first resilient piece  23  is cantilevered. The first resilient piece  23  is resiliently displaced in the vertical direction with the fulcrum  25 P of the first fixed end  25  as a center. The rear end part of the first resilient piece  23  is located in a formation range of the projecting portions  15  in the vertical direction. 
     The linking portion  23 B is provided with the two first contact point portions  21 . The respective first contact point portions  21  are formed between a front edge  26 A and a rear edge  26 B of the linking portion  23 B. The first contact point portions  21  are arranged at positions shifted in the lateral direction from the extending portions  23 A. The two first contact point portions  21  are located inwardly of the two extending portions  23 A in the lateral direction. An interval in the lateral direction between the two contact point portions  21  is narrower than that between the two extending portions  23 A. In this way, the two first contact point portions  21  can be brought into contact with even a tab portion having a width narrower than the interval in the lateral direction between the extending portions  23 A. The tops of the first contact point portions  21  are located on an uppermost end in the first resilient piece  23  (see  FIG. 5 ). 
     As shown in  FIG. 3 , the second resilient piece  24  extends forward (second direction) from a second fixed end  27  fixed to the linking portion  23 B. The second fixed end  27  is located on rear end parts of the extending portions  23 A via the linking portion  23 B. The second fixed end  27  is located in a lateral center of the linking portion  23 B. A width (dimension in the lateral direction) of the second resilient piece  24  is smaller than those (dimensions in the lateral direction) of the extending portions  23 A of the first resilient piece  23 . 
     Slits  28  are formed between the second resilient piece  24  and the extending portions  23 A of the first resilient piece  23 . The first contact point portions  21  are provided within widths of the slits  28 . The first contact point portions  21  are located between the extending portions  23 A and the second resilient piece  24  in the lateral direction. 
     As shown in  FIG. 5 , the second resilient piece  24  extends obliquely upward from the second fixed end  27  in a state where the second resilient piece  24  is not resiliently displaced. A fulcrum  27 P of the second fixed end  27  is at a position serving as a center of a resilient displacement of the second resilient piece  24 . A front end part of the second resilient piece  24  is a free end. In other words, the second resilient piece  24  is cantilevered. The second resilient piece  24  is resiliently displaced in the vertical direction with the fulcrum  27 P of the second fixed end  27  as a center. The front end part of the second resilient piece  24  is bent downward. The front end of the second resilient piece  24  is located forward of the first fixed end  25  of the first resilient piece  23 . 
     As shown in  FIG. 3 , the second resilient piece  24  is provided with one second contact point portion  22 . The second contact point portion  22  is smaller than the first contact point portions  21  in a plan view from above. The second contact point portion  22  is located forward of the first contact point portions  21 . The second contact point portion  22  is located substantially in the middle between the two first contact point portions  21  in the lateral direction. 
     As shown in  FIG. 5 , the second contact point portion  22  is located forward (toward the tip side in the second direction) of the fulcrum  25 P of the first fixed end  25 . The second contact point portion  22  is provided rearward of the front end of the second resilient piece  24 . The second contact point portion  22  is located in the formation range of the projecting portions  15  in the vertical direction. The top of the second contact point portion  22  is located on an uppermost end in the second resilient piece  24 . 
     The second contact point portion  22  and the first contact point portions  21  are arranged on front and rear sides with respect to the fulcrum  25 P of the first fixed end  25  as a center. Accordingly, the second contact point portion  22  and the first contact point portions  21  are displaced in a seesaw manner with the fulcrum  25 P of the first fixed end  25  as a center. Specifically, if the first contact point portions  21  are lowered with the fulcrum  25 P of the first fixed end  25  as a center, the second contact point portion  22  is raised. 
     The second contact point portion  22  and the first contact point portions  21  are arranged on front and rear sides with respect to the fulcrum  27 P of the second fixed end  27  as a center. Accordingly, the first contact point portions  21  and the second contact point portion  22  are displaced in a seesaw manner with the fulcrum  27 P of the second fixed end  27  as a center. Specifically, if the second contact point portion  22  is lowered with the fulcrum  27 P of the second fixed end  27  as a center, the first contact point portions  21  are raised. 
       FIG. 6  shows a developed state of the terminal fitting T before being bent. The terminal fitting T in the developed state is formed with two punch holes  31 ,  32 . The first punch hole  31  is punched out between parts which will become the extending portions  23 A of the first resilient piece  23  and a part which will become the second resilient piece  24 . A part which will become the first resilient piece  23  extends forward from the front edge of a part which will become the lower wall  13  of the body portion  10 . Front end parts of the parts which will become the extending portions  23 A of the first resilient piece  23  are linked by a part which will become the linking portion  23 B. The part which will become the second resilient piece  24  extends rearward from the rear edge of the part which will become the linking portion  23 B. The first punch hole  31  divides the part which will become the lower wall  13 , the part which will become the first resilient piece  23  and the part which will become the second resilient piece  24 . The first punch hole  31  includes parts which will become the slits  28 . Since the first punch hole  31  is larger than elongated slits in the case of dividing and forming three resilient pieces one by one, the strength of a mold can be improved. The second punch hole  32  is formed in the part which will become the lower wall  13  of the body portion  10 . Parts which will become the excessive deflection preventing portion  16  and the stabilizer  17  are formed by the second punch hole  32 . 
     Next, the connection of the terminal fitting T and the mating terminal fitting  100  is described. With the terminal fitting T and the mating terminal fitting  100  properly connected, the tab portion  102  is sandwiched between the two ridge portions  14  and the three contact point portions  21 ,  22  as shown in  FIG. 2 . The left and right ridge portions  14  simultaneously contact the upper surface of the tab portion  102 . The two first contact point portions  21  and the one second contact point portion  22  simultaneously contact the lower surface of the tab portion  102 . The tab portion  102  is held in contact with the two ridge portions  14  and the three contact point portions  21 ,  22  by resilient forces of the first and second resilient pieces  23 ,  24 . 
     With the terminal fitting T and the mating terminal fitting  100  properly connected, the tab portion  102  may vertically vibrate inside the body portion  10 . The vertical vibration of the tab portion  102  means the alternate repetition of a posture in which the tab portion  102  is so inclined that one of the tip side of the tab portion  102  and the side of the tab portion  102  behind the tip is located on an upper side and the other is located on a lower side and an opposite posture as shown in  FIGS. 7 and 8 . 
       FIG. 7  shows a state where the tip side of the tab portion  102  is displaced downward. In this state, the first contact point portions  21  are displaced downward with the fulcrum  25 P of the first fixed end  25  as a center. Contact loads of the first contact point portions  21  increase by being pressed by the tab portion  102 . On the other hand, the second contact point portion  22  is displaced upward with the fulcrum  25 P of the first fixed end  25  as a center by a seesaw effect associated with a resilient displacement of the first resilient piece  23 . In this way, a reduction in the contact load of the second contact point portion  22  can be suppressed. 
       FIG. 8  shows a state where the rear side of the tab portion  102  is displaced downward. In this state, the second contact point portion  22  is displaced downward with the fulcrum  27 P of the second fixed end  27  as a center. A contact load of the second contact point portion  22  increases by being pressed by the tab portion  102 . On the other hand, the first contact point portions  21  are displaced upward with the fulcrum  27 P of the second fixed end  27  as a center by a seesaw effect associated with a resilient displacement of the second resilient piece  24 . In this way, a reduction in the contact loads of the first contact point portions  22  can be suppressed. 
     As just described, even if the tab portion  102  vertically vibrates, the contact loads of the three contact point portions  21 ,  22  do not decrease, wherefore a sliding movement of the tab portion  102  can be suppressed. 
     With the terminal fitting T and the mating terminal fitting  100  properly connected, the tab portion  102  may laterally swing. As shown in  FIG. 9 , the lateral swing of the tab portion  102  means the inclination of the tip side of the tab portion  102  to be located more leftward or rightward than the side behind the tip side of the tab portion  102  in a virtual horizontal plane (XZ plane).  FIG. 9  shows a state where the tip side of the tab portion  102  is located more leftward than the rear side of the tab portion  102 . In this state, the right edge of the tab portion  102  contacts the projecting portion  15  of the body portion  10 . A contact point C of the tab portion  102  and the projecting portion  15  serves as a center of the swing of the tip side of the tab portion  102 . The sum of distances D 1 , D 2  and D 3  between the contact point C and the respective contact point portions  21 ,  22  is larger than in the case where the center of the shake of the tip side of the tab portion  102  is located inside the three contact point portions  21 ,  22 . Thus, a load necessary to laterally swing the tip side of the tab portion  102  is larger than in this case. Therefore, connection reliability can be improved by suppressing the lateral swing of the tab portion  102 . The distances D 1 , D 2  and D 3  are shortest distances between the contact point C and the tops of the respective contact point portions  21 ,  22  in the virtual horizontal plane (XZ plane). 
     Next, functions and effects of the embodiment configured as described above are described. The terminal fitting T includes the body portion  10 , the first and second resilient pieces  23 ,  24 , the first contact point portions  21  and the second contact point portion  22 . The body portion  10  is tubular. The first and second resilient pieces  23 ,  24  are provided inside the body portion  10 . The first contact point portions  21  are provided on the first resilient piece  23  and contact the tab portion  102  of the mating terminal fitting  100 . The second contact point portion  22  is provided on the second resilient piece  24  and contacts the tab portion  102 . The first resilient piece  23  extends rearward (in the length direction of the tab portion  102 ) from the first fixed end  25  fixed to the body portion  10  and is resiliently displaceable with the fulcrum  25 P of the first fixed end  25  as a center. The second resilient piece  24  extends forward from the second fixed end  27  fixed to the first resilient piece  23  and is resiliently displaceable with the fulcrum  27 P of the second fixed end  27  as a center. The first contact point portions  21  are located rearward of the fulcrum  27 P of the second fixed end  27 . The second contact point portion  22  is located forward of the fulcrum  25 P of the first fixed end  25 . 
     According to this configuration, if the tab portion  102  is displaced in a direction to press the first contact point portions  21 , the first resilient piece  23  can be mainly resiliently displaced with the fulcrum  25 P of the first fixed end  25  as a center and the second contact point portion  22  can be displaced toward the tab portion  102  like a seesaw. Thus, a reduction in the contact load of the tab portion  102  and the second contact point portion  22  can be suppressed. On the other hand, if the tab portion  102  is displaced in a direction to press the second contact point portion  22 , the second resilient piece  24  can be mainly resiliently displaced with the fulcrum  27 P of the second fixed end  27  as a center and the first contact point portions  21  can be displaced toward the tab portion  102  like a seesaw. Thus, a reduction in the contact loads of the tab portion  102  and the first contact point portions  21  can be suppressed. Therefore, even if the tab portion  102  is displaced in the direction to press either the first contact point portions  21  or the second contact point portion  22 , a reduction in the contact load(s) of the contact point portion(s)  21 ,  22  can be reduced. 
     The first resilient piece  23  includes the two extending portions  23 A extending in the front-rear direction and the linking portion  23 B linking the rear end sides of the two extending portions  23 A. The two first contact point portions  21  are provided on the linking portion  23 B. According to this configuration, since the interval between the extending portions  23 A of the first resilient piece  23  can be made smaller than that between the first contact point portions  21 , a tab portion having a small width can be dealt with. 
     The body portion  10  includes the side walls  11  arranged on both lateral sides of the tab portion  102 . The side walls  11  include the projecting portions  15  projecting toward the first and second resilient pieces  23 ,  24 . According to this configuration, if the tip side of the tab portion  102  laterally swings, the side edge of the tab portion  102  contacts the projecting portion  15  and the contact point C of the side edge of the tab portion  102  and the projecting portion  15  serves as a center of a swinging movement of the tip of the tab portion  102 . In this way, the distances between the respective contact points  21 ,  22  and the center (contact point C) of the swinging movement can be larger than those when a center of a swinging movement of a tab portion is located inside a plurality of contact point portions. Therefore, a load necessary to swing the tip of the tab portion  102  can be increased, wherefore the swinging movement of the tip of the tab portion  102  can be suppressed. 
     Other Embodiments of Present Disclosure 
     The embodiment disclosed this time should be considered illustrative in all aspects, rather than restrictive. 
     In the case of the above embodiment, the resilient piece  23  includes two extending portions  23 A. As another embodiment, a first resilient piece may include only one extending portion or may include three or more extending portions. If the first resilient piece includes only one extending portion, a linking portion may not be provided. 
     In the case of the above embodiment, the resilient piece  20  includes one second resilient piece  24 . As another embodiment, a resilient piece may include two or more second resilient pieces. 
     In the case of the above embodiment, the first resilient piece  23  extends rearward from the first fixed end  25  fixed to the body portion  10  and the second resilient piece  24  extends forward from the second fixed end  27  fixed to the first resilient piece  23 . As another embodiment, extending directions of the first resilient piece and the second resilient piece may be reversed in the front-rear direction. Specifically, the first resilient piece may extend forward from the first fixed end fixed to the body portion and the second resilient piece may extend rearward from the second fixed end fixed to the first resilient piece. 
     In the case of the above embodiment, the fulcrum  25 P of the first fixed end  25  is a center point of the first fixed end  25  and the fulcrum  27 P of the second fixed end  27  is located on an extension of the front edge  26 A of the linking portion  23 B. As another embodiment, a first fixed end and a second fixed end may be formed differently from those of the above embodiment. The position of a fulcrum of the first fixed end and that of a fulcrum of the second fixed end are changed depending on the forms of the first and second fixed ends. 
     In the case of the above embodiment, the left and right side walls  11  include the projecting portions  15 . As another embodiment, left and right side walls may not include projecting portions. Only either one of left and right side walls may include a projecting portion. 
     In the case of the above embodiment, the first contact point portions  21  are provided on the linking portion  23 B. As another embodiment, first contact point portions may be provided on extending portions of a first resilient piece. 
     From the foregoing, it will be appreciated that various exemplary embodiments of the present disclosure have been described herein for purposes of illustration, and that various modifications may be made without departing from the scope and spirit of the present disclosure. Accordingly, the various exemplary embodiments disclosed herein are not intended to be limiting, with the true scope and spirit being indicated by the following claims.