JP2006120370A - Female terminal fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a female terminal fitting prevented form floating of a turnback part of an elastic contact piece. <P>SOLUTION: An elastic contact piece 4 formed by turning back a bottom face part 3 at its front edge part 3C is formed on a main body part 2 of the female terminal fitting 1, and a main body part 2 of the terminal fitting is made to have a structure pinching a male tab 8 between the elastic contact piece and an upper face part 7 facing the elastic contact piece when the male tab is inserted. Further, a floatation preventing part 10 capable of locking to a turnback part 4A is formed on a side face part 9 of the main body part 2 which can regulate the floating of the turnback part 4A of the elastic contact piece 4 and avoid lowering of contact pressure. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a female terminal fitting provided with an elastic contact piece that elastically contacts a male tab in a rectangular tube portion, and the elastic contact piece relates to a female terminal fitting having a function of restricting bending at a folded portion.

  Conventionally, what was described in following patent document 1 is known as this kind of female terminal metal fittings.

This female terminal fitting has a box-shaped main body part, and this main body part is formed by bending so that a pair of side surface parts are opposed to each other from the bottom surface part of the main body part. And a U-shaped folding at the front edge portion of the bottom surface portion to bend the elastic contact piece between the side surface portions. The front end of the part protrudes forward from the front edge of the bottom part.
JP 2001-6784 A

  However, in recent years, there has been a strong demand from users for miniaturization of parts, and a new problem has arisen with a decrease in the strength of the main body due to the punching of a thin metal plate. That is, when the elastic contact piece is bent and deformed due to the entry of the male tab, the contact portion of the elastic contact piece is displaced downward, and the folding portion of the elastic contact piece which is not originally intended is lifted. Came to be pointed out. Such lifting of the elastic contact piece acts in the direction of displacing the contact portion downward, causing a problem of reducing the contact pressure with respect to the male tab.

  This invention is completed based on the above situations, Comprising: It aims at preventing the raising of the folding | turning part in the elastic contact piece of a female terminal metal fitting.

As means for achieving the above object, the invention of claim 1 includes a box-shaped main body portion, a U-shaped folded portion projecting forward from the front edge of the bottom surface portion of the main body portion, and extending backward from the folded portion. In the female terminal fitting having a structure in which an elastic contact piece composed of a spring part is provided and a male tab is sandwiched between the upper surface portion of the elastic contact piece,
The lifting prevention piece provided on either one of the folded part or the side part of the body part sandwiching the folded part is provided so as to be engaged with the other, so that the lifting of the folded part can be regulated. It is characterized by.

  According to a second aspect of the present invention, in the first aspect of the present invention, the lift-off preventing piece is formed so as to be cut inward from a front end portion of the side surface portion in the main body portion and to be locked to the folded portion. It is characterized by.

  According to a third aspect of the present invention, in the first aspect of the present invention, a notch portion is provided in a portion of the side surface portion that faces the folded portion, while the lifting prevention piece portion is a side edge portion of the folded portion. In this case, the cutout portion is formed so as to be able to be locked.

  According to a fourth aspect of the present invention, there is provided the apparatus according to any one of the first to third aspects, wherein a pair of the anti-lifting pieces are provided in the width direction.

<Invention of Claims 1-3>
According to the first to third aspects of the present invention, when lifting occurs in the folded portion of the elastic contact piece, it is possible to regulate the lifting by providing the lifting prevention piece portion on either the folded portion or the side surface portion. it can. As a result, there is no downward displacement of the contact portion due to floating, and the contact pressure with respect to the male tab can be maintained.

<Invention of Claim 4>
When preventing the folded portion from being lifted, if the lifting prevention piece is installed on one side of either the folded portion or the side surface, the side where the folded portion is not installed is lifted. By providing the anti-lifting piece on the surface, the twisting of the elastic contact piece can be restricted and inserted stably.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In the following description, the up and down direction is the up and down direction in FIG. 1, the width direction is the left and right direction in FIG. 1, and the front and back direction is the direction orthogonal to the paper surface in FIG. The direction.

  The female terminal fitting 1 in the present embodiment is formed by bending a metal plate having a predetermined developed shape, and an insulation barrel portion 13 for crimping a covering portion of an electric wire W (not shown), It consists of a wire barrel portion 14 for crimping a core wire (not shown) stripped from the covering portion, and a main body portion 2 provided in front thereof.

  As shown in FIG. 1, the main body 2 has a top surface portion 7 that is bent from the bottom surface portion 3 so that the pair of side surface portions 9 are opposed to each other, and is further formed by folding both side surface portions 9 together. In addition, the overall shape is a square tube that is open forward and backward, and the male tab 8 is inserted through the tab insertion opening 11 at the front end of the main body 2.

  Inside the main body 2, an elastic contact piece 4 comprising a folded portion 4 </ b> A folded back in a substantially U shape from the front edge 3 </ b> C of the bottom surface portion 3 and a substantially mountain-shaped spring portion 4 </ b> B extending rearward from the folded portion 4 </ b> A. Is installed, and a dome-shaped contact 5 is formed at the apex of the spring portion 4B. The upper surface portion 7 of the main body portion 2 is provided with two rows of contact protrusions 7A that are formed by being knocked out from the outer surface side in the front-rear direction. It is intended to be sandwiched.

  In addition, when the main body 2 is inserted into a cavity (not shown) of a female connector housing (not shown), a stabilizer 6 provided so as to fit in two grooves provided in the cavity in advance is provided on the bottom surface portion. Are formed in a cut-and-raised manner on both side edges of the width direction of the, so as to prevent reverse insertion into the cavity. In the female terminal fitting 1, a corner portion on the rear side of the upper surface portion 7 serves as a locking portion 15 so that a lance provided in the cavity is locked, and functions to prevent the female terminal fitting 1 from being detached.

  On the other hand, two parallel slits that are long in the front-rear direction are provided behind the stabilizer 6 in the bottom surface portion 3 of the main body portion 2. The stepped portion 3A is formed by knocking out the region sandwiched between the slits from the outer surface side, and when the male tab 8 is inserted, the spring bounced back into a dogleg shape at the extended end of the elastic contact piece 4 The raised portion 5A comes into contact with the stepped portion 3A, and then comes into sliding contact with 3A. Further, a slit similar to the above is also provided between the folded portion 4A and the stabilizer 6, and similarly, by pushing and extending a region sandwiched between the slits from the outer surface side, a substantially chevron shape is seen from the side surface. An excessive deflection preventing piece 3B is formed. The vertex portion of the excessive deflection preventing piece portion 3B is positioned below the contact 5 of the elastic contact piece 4, and the lower surface of the contact point 5 can be brought into contact with the vertex portion of the excessive deflection preventing piece portion 3B. The elastic contact piece 4 can be bent within the elastic limit.

  Both sides in the width direction of the folded portion 4A of the elastic contact piece 4 are notched from the bottom surface portion to the side surface portion. Thus, the folded portion 4A extends in a cantilevered manner from the front edge 3C of the bottom surface portion, and has a structure that is allowed to bend in the lifting direction. However, the front end position of the folded portion is positioned so as to be slightly retracted inward from the position of the front edge of the side surface portion, and when the female terminal fitting 1 is inserted into the cavity, the front end wall directly in the cavity The folded portion 4A is prevented from contacting.

  On the inner surface side of the folded portion 4A, the tip portions of the pair of lifting prevention piece portions 10 are located. The lifting prevention piece 10 is formed by inwardly bending a side edge portion in the vertical direction of the notched portion of the side surface portion 9 described above. Specifically, it is formed with a width dimension corresponding to the region indicated by L shown in FIG. 4 (the length region from the front edge 3C of the bottom surface portion 3 to the start end of the folded portion 4A). The height of the lifting prevention piece 10 is adjusted so that the lower surface of the lifting prevention piece 10 and the inner surface of the region indicated by L in the folded portion 4A are close to or in contact with each other when the female terminal fitting 1 is a single unit. The rising of the folded portion 4A can be regulated.

  This embodiment has the structure as described above, and the operation thereof will be described subsequently. When the male tab 8 enters from the tab insertion port 11 at the tip of the main body 2 in a normal posture while being kept parallel to the contact protrusion 7A, the male tab 8 hits the contact 5 of the elastic contact piece 4 during the insertion process, It bends and deforms downward about the folded portion 4A. Thereafter, when the extended end of the elastic contact piece 4 comes into contact with the stepped portion 3A, the elastic contact piece 4 is bent and deformed with the two portions of the folded portion 4A and the flip-up portion 5A as fulcrums. Thereafter, when the elastic contact piece 4 is further pressed downward while passing through the contact point 5 as the male tab 8 is inserted, the extended end is brought into sliding contact with the stepped portion 3A. And the male tab 8 is elastically sandwiched between the contact point 5 and the contact protrusion 7A, so that a contact pressure can be obtained that maintains a connection state that allows electrical conduction. .

  On the other hand, for example, when the male tab 8 enters in an obliquely downward posture and hits the elastic contact piece 4 due to misalignment or the like, it acts as a force in a direction of pushing backward with respect to the elastic contact piece 4. Then, the tip of the folded portion 4A is lifted and tries to displace the periphery of the contact 5 downward. This means that the contact pressure against the male tab 8 is reduced. However, when the folded portion 4A is about to rise, the folded portion 4A is locked in advance by the lifting prevention piece portion 10 provided on the inner surface side of the folded portion 4A in advance, and the lifting is prevented. Sufficient contact pressure can be obtained by properly sandwiching the contact protrusion 7A.

  As described above, in the present embodiment, the prevention piece 10 that can be locked with the folded portion 4A is installed, thereby avoiding the downward displacement of the contact 5 due to the floating of the folded portion 4A, and sufficient contact pressure with respect to the male tab. Can be held. Further, as described above, considering that the floating of the folded portion 4A is caused by the thinning of the female terminal fitting, the problem of avoiding the floating is realized, thereby reducing the size of the female terminal fitting. Also contribute.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the structure of the floating prevention piece 10 of the female terminal fitting 1 in the first embodiment is partially changed, and description of other overlapping structures is omitted.

  In the second embodiment, the notch portion 16 is provided at the lower end portion of the front edge of the side surface portions 9, while the lifting prevention piece portion 10 is integrally formed so as to project from both side edges of the folded portion 4 </ b> A, and the upper edge of the notch portion 16. Can be locked. As shown in FIG. 9, the tip of the overhanging portion is lifted upward by approximately 45 degrees so that the end edge 12 is locked to the upper edge of the notch 16. According to this structure, it is possible to suppress deformation when the lifting prevention piece 10 is locked to the notch 16.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.

  (1) In the first embodiment, the anti-lifting piece 10 is engaged with the folded portion 4A on the lower surface. However, when the anti-lifting piece 10 is liable to be deformed at the time of locking. May be engaged with the folded portion 4 </ b> A not by the lower surface but by the side edge by changing the bending direction of the lifting prevention piece 10.

  (2) The cutout portion 16 in the second embodiment has a form that opens forward and downward, but is not limited to such a form, and may have a window shape with a closed opening edge.

Front view of female terminal fitting in embodiment 1 Side view of female terminal fitting Bottom view of female terminal fitting IV-IV sectional view of FIG. Cross-sectional view taken along line V-V in FIG. Sectional view taken along line VI-VI in FIG. Longitudinal section with male tab tip inserted to near contact Vertical section with male tab inserted to normal depth Front view of female terminal fitting in embodiment 2 XX sectional view of FIG. XI-XI line sectional view of FIG. XII-XII sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Female terminal metal fitting 2 ... Main-body part 3 ... Bottom face part 4A ... Folding part 4B ... Spring part 4 ... Elastic contact piece 7 ... Upper surface part 8 ... Male tab 9 ... Side face part 10 ... Lifting prevention piece part 16 ... Notch part

Claims (4)

An elastic contact piece comprising a box-shaped main body portion, a U-shaped folded portion protruding forward from the front edge of the bottom surface of the main body portion, and a spring portion extending rearward from the folded portion; In the female terminal fitting having a structure in which a male tab is sandwiched between the upper surface portion of
The lifting prevention piece provided on either one of the folded part or the side part of the body part sandwiching the folded part is provided so as to be engaged with the other, so that the lifting of the folded part can be regulated. A female terminal fitting. 2. The female terminal fitting according to claim 1, wherein the lifting prevention piece portion is formed to be cut inward from a front end portion of the side surface portion in the main body portion and to be locked to the folded portion. . A portion of the side surface portion facing the folded portion is provided with a notch portion, and the lift-off preventing piece portion is formed so as to be able to be locked to the notched portion at a side edge portion of the folded portion. The female terminal fitting according to claim 1. The female terminal fitting according to any one of claims 1 to 3, wherein a pair of the lifting prevention pieces are provided in the width direction.

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