JP2826025B2 - Lock terminal fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock terminal fitting which is attached to, for example, an electromagnetic device such as a discharge lamp ballast and into which a core of an electric wire is inserted and connected.

[0002]

2. Description of the Related Art FIG. 5 is a perspective view showing a conventional lock terminal fitting, in which 1 is a terminal main portion, 2 is an end plate portion, 3 is an insertion hole, and 4 is an elastically deformable lock base. , 5 is a lock pinching portion, 6 is a mounting portion, and the lock terminal fitting of this configuration is:
For example, the mounting portion 6 is inserted into a mounting hole provided in a coil bobbin of an electromagnetic device to be mounted. The lock pinching portion 5 is connected to the tip of the lock base portion 4 and is bent in a direction gradually moving away from the insertion hole 3 to form a flat plate having a linear tip edge 5a as shown in FIG. .

[0003] Reference numeral 7 denotes an electric wire, and 7a denotes a core wire. This electric wire 7
The core wire 7a is inserted into the insertion hole 3 along the longitudinal direction of the terminal main part 1. Then, the core wire 7a is connected to the lock base portion 4.
The lock holding portion 5 is displaced in a direction away from the back surface of the terminal main portion 1 while elastically deforming, etc., and is passed between the lock holding portion 5 and the terminal main portion 1, so that the core wire 7a
The leading edge 5 of the lock pinching portion 5 bites into the lock. Thereby,
As shown in FIGS. 7 and 8, the core wire 7a is locked and the core wire 7a is electrically and mechanically connected to the lock terminal fitting.

[0004]

In the prior art, there is no structure for positioning the core wire 7a, and as shown in FIG. 8, the leading edge 5a has one bite into the core wire 7a. Large variation in locked state. In addition, as shown in FIG. 7, since the tip end surface 5b of the lock pinching portion 5 is inclined with respect to the core wire 7a, when the core wire 7a is pulled while being twisted, a spiral groove is formed in the core wire 7a. However, there is a possibility that the core wire 7a may come off from the chain terminal fitting.

It is an object of the present invention to provide a lock terminal fitting which can improve the reliability of a lock with respect to a core wire of an electric wire and can perform a manual connection work of a core wire smoothly with a light operating force.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a flat terminal main part, which is connected to one end in the longitudinal direction of the main part and bent to the back side of the terminal main part. An end plate portion, an insertion hole provided at one end of the end plate portion on the side of the terminal main portion, through which a core wire of an electric wire inserted along a longitudinal direction of the terminal main portion passes, and an end hole of the end plate portion. A lock base unit connected to the other end and bent so as to be elastically deformable toward the terminal main unit side; and a lock base unit connected to the distal end of the base unit, bent in a direction away from the insertion hole, inclined and inclined to connect the core wire to the terminal main unit. And a lock terminal fitting provided with a lock-clamping portion to be interposed between the lock terminal fittings.

[0007] In order to achieve the above object, at the center in the width direction of the lock pinching portion, a projection is provided on a surface opposite to a surface facing the terminal main portion, and substantially perpendicular to the core wire. A holding recess formed at a tip edge of the lock holding portion with a V-shaped core wire contact edge formed of a pair of sides contacting from the opposite direction is provided opposite the insertion hole, and the core wire contact is formed from both sides sandwiching the recess. The first pair of substantially triangular shapes that are gradually narrowed and inclined toward the intersection of the pair of sides forming a V-shaped edge.
It is formed by a guide surface and a substantially triangular second guide surface which is provided between the first guide surfaces and gradually narrows toward the intersection.

[0008]

In the above construction, the holding concave portion formed in the lock holding portion facing the insertion hole positions the core wire of the electric wire held between the lock main portion and the lock holding portion, and The V-shaped core wire contact edge of the holding concave portion contacts and bites the core wire at two positions in the circumferential direction of the core wire from a direction substantially perpendicular to the axis, and locks the core wire to provide electrical and mechanical functions. Make a connection. Therefore, the dispersion of the locked state is small,
Even when the core wire is pulled while being twisted, the core wire can be prevented from coming off from the lock terminal fitting. Further, a pair of substantially triangular first guide surfaces forming a holding recess and a second guide surface are provided.
The guide surface guides the core wire passing through the insertion hole toward the intersection of the V-shaped pair of sides of the V-shaped core wire contact edge. In this guide, the holding concave portion has a wide insertion hole side and gradually narrows toward the intersection of the V-shaped core wire contact edge, so that the tip position of the core wire passing through the insertion hole varies somewhat. However, the core wire can be guided toward the intersection while preventing the core wire from coming off the holding recess, and the core wire is guided at the wide entrance of the second guide surface in the initial stage of this guide, so that the resistance is small.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Lock terminal fitting 1 shown in the perspective view of FIG.
Reference numeral 1 denotes a metal plate formed by bending a metal plate such as a copper alloy having excellent conductivity, and includes a terminal main portion 12, an end plate portion 13, an insertion hole 14,
Lock base 15, lock pinch 16, and mounting part 1
The lock terminal fitting 11 is used by fixing a mounting portion 17 to, for example, a coil bobbin of an electromagnetic device (not shown), and a core wire 18 of an electric wire 18 passed through an insertion hole 14 thereof.
The electric wire 18 and the lock terminal fitting 11 are electrically and mechanically connected to each other.

The terminal main portion 12 has a flat plate shape whose length is longer than its width. As shown in FIGS. 1 and 3, the end plate portion 13 is connected to one end in the longitudinal direction of the terminal main portion 12 and is bent substantially perpendicularly to the back side of the terminal main portion 12. The insertion hole 14 is provided from one end of the end plate portion 13 on the terminal main portion 12 side to one end of the terminal main portion 12 on the end plate portion 13 side. The insertion hole 14 has an opening area large enough to allow the core wire 18a of the electric wire 18 to be inserted.

An elastically deformable lock portion is formed by the lock base portion 15 and the lock pinching portion 16. The lock base 15 is connected to the other end of the end plate 13 and is bent in an arc shape drawing a smooth curvature toward the back surface of the terminal main portion 12, and can be elastically deformed. The lock holding portion 16 for holding the core wire 18a of the electric wire 18 between the terminal main portion 12 and the terminal portion 12 is bent from the front end of the lock base portion 15 and extends obliquely toward the back surface of the terminal main portion 12. In this state, the tip is close to or in contact with the back surface of the terminal main part 12. The lock holding portion 16 is inclined in a direction away from the insertion hole 14 as it approaches the terminal main portion 12.

As shown in FIG. 1 to FIG.
In the middle in the width direction of the holding recess 6, the holding recess 1 facing the insertion hole 14
9 are formed. The holding recess 19 is provided with the lock holding portion 16.
And a V-shaped core wire contact as if the center of the front end of the lock pinching portion 16 was cut out by the protrusion. The edge 20 is formed at the leading edge of the chain-like holding portion 16. As shown in FIG. 3, the tip end surface 21 of the holding concave portion 19 extends along a direction substantially perpendicular to the axis with respect to the core wire 18a sandwiched between the locking main portion 12 and the core wire contact edge 20. 18
a.

As shown in detail in FIG. 2, the holding concave portion 19 is formed at the intersection 2 of a pair of sides 20a forming a V-shape of the core wire contact edge 20 from both side portions 16a sandwiching the concave portion 19 of the child.
4, a pair of substantially triangular first guide surfaces 22 which are gradually narrowed toward 4 and inclined, and a substantially triangular second guide which is provided between the first guide surfaces 22 and is gradually narrowed and inclined toward the intersection 24. The guide surface 23 is formed. The pair of first guide surfaces 22 are opposed to each other in the width direction of the lock pinching portion 16, and the entrance width A of the substantially triangular second guide surface 23 on the opposite side to the intersection 24 is the line of the core wire 18a. It is larger than the diameter.

The mounting portion 17 is bent from the other end of the terminal main portion 12 in the longitudinal direction and continues.

The electric wire 18 is connected to the lock terminal fitting 11 by manually inserting the core wire 18a into the insertion hole 14 along the longitudinal direction of the terminal main part 12. In other words, the core wire 18a is displaced in a direction away from the back surface of the terminal main portion 12 while elastically deforming the lock base portion 15 and the like via the lock holding portion 16 with which the core wire 18a comes into contact. As a result, the core wire 18a is inserted between the lock holding portion 16 and the terminal main portion 1 so that the core wire contact edge 20 of the lock holding portion 16 bites into the core wire 18a by the elastic force of the lock base portion 15. Thereby, the core wire 18a is locked, and the electric wire 18 and the lock terminal fitting 11 are electrically and mechanically connected.

Since the locking concave portion 19 is formed in the lock holding portion 16 so as to face the insertion hole 14, in the above connection, the core wire 18 a passing through the insertion hole 14 is locked by the locking concave portion 19. Positioned in the width direction of the portion 16,
It is positioned and held between the holding recess 19 of the lock holding portion 16 and the lock main portion 12. Moreover, in this clamping, the V-shaped core wire contact edge 20 of the clamping concave portion 19
The pair of sides 20a having the V-shape bite into two places in the circumferential direction of the core wire 18a. Therefore, variation in the locked state of the core wire 18a with respect to the lock terminal fitting 11 can be reduced.

Further, in the above-mentioned holding, the holding recess 19
The V-shaped core contact edge 20 contacts and bites the core 18a from a direction substantially perpendicular to the axis to lock the core 18a. Therefore, even after the core wire 18a is pulled while being twisted after the connection, the core wire 18a can be prevented from coming off the lock terminal fitting 11.

Therefore, the reliability of the lock of the electric wire 18 with respect to the core wire 18a can be improved.

In addition, since the holding concave portion 19 is formed with a pair of first guide surfaces 22 and a substantially triangular second guide surface 23 interposed between the first guide surfaces 22, a manual operation is performed. The connection work of the core wire 18a can be performed smoothly with a light operating force.

That is, the substantially triangular second guide surface 23 and the pair of first guide surfaces 22 are connected to the core wire 1 passing through the insertion hole 14.
8a is guided towards the V-shaped intersection 24 of the V-shaped core contact edge 20. In this guide, the entrance width A of the second guide surface 23 where the core wire 18a first comes into contact is wider than the core wire 18a, and the holding concave portion 19 is gradually narrowed toward the intersection 24. Even if the distal end position of the core wire 18a passing through the insertion hole 14 is slightly varied, the core wire 18a can be guided toward the intersection 24 while preventing the core wire 18a from coming off the holding concave portion 19. Moreover, at the beginning of this guidance, the core wire 18
a can be almost guided by the second guide surface 23, and the resistance required for insertion of the core wire 18a in the initial stage is small.

Therefore, the insertion of the core wire 18a can be performed smoothly, the load applied to the operator during the insertion can be reduced, and the connection can be performed with a light operating force.

[0022]

As described above in detail, according to the lock terminal fitting of the present invention, the core of the electric wire held between the lock holding portion and the lock main portion is formed by the holding recess provided in the lock holding portion. As well as positioning, the V-shaped core wire contact edge of this holding concave portion is made to bite into the core wire at two locations in the circumferential direction from a direction substantially perpendicular to the axis, and the core wire is locked. Even if the locked core wire is pulled while being twisted, it can be prevented from coming off, and therefore, the reliability of the lock with respect to the core wire of the electric wire can be improved. The insertion recess side is wider on the side of the insertion hole, and gradually narrows toward the intersection of a pair of sides forming the V-shape of the V-shaped core wire contact edge. Even if the position of the tip is slightly varied, the core wire can be guided toward the intersection and the resistance in the initial stage of the guide is small, so that the manual connection of the core wire can be smoothly performed with a light operating force.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which an electric wire is connected to a lock terminal fitting according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing a lock portion of the lock terminal fitting according to the embodiment.

FIG. 3 is an exemplary sectional view showing a portion where the core wire of the electric wire is connected to the lock terminal fitting according to the embodiment;

FIG. 4 is a sectional view taken along the line ZZ in FIG. 3;

FIG. 5 is a perspective view showing a state in which an electric wire is connected to a lock terminal fitting according to a conventional example.

FIG. 6 is an enlarged perspective view showing a lock portion of the lock terminal fitting according to the conventional example.

FIG. 7 is a sectional view showing a portion where the core of the electric wire is connected to the lock terminal fitting according to the conventional example.

FIG. 8 is a sectional view taken along the line YY in FIG. 7;

[Explanation of symbols]

11: Lock terminal fitting, 12: Terminal main part, 13: End plate part,
Reference numeral 14: insertion hole, 15: lock base portion, 16: lock holding portion, 16a: both side portions sandwiching the holding recess, 18: electric wire, 1
8a: core wire, 19: holding concave portion, 20: core wire contact edge, 22
... 1st guide surface, 23 ... 2nd guide surface, 24 ... intersection.

Claims (1)

(57) [Claims] 1. A flat terminal main portion, an end plate portion connected to one end in the longitudinal direction of the main portion and bent to the back side of the terminal main portion, and a terminal portion of the end plate portion on the terminal main portion side. An insertion hole provided at one end portion, through which a core wire of an electric wire inserted along the longitudinal direction of the terminal main portion passes, and connected to the other end of the end plate portion so as to be elastically deformable toward the terminal main portion side. A lock having a bent lock base portion, and a lock holding portion connected to the tip of the base portion, bent and inclined in a direction away from the insertion hole and holding the core wire with the terminal main portion. In the terminal fitting, a V formed of a pair of sides protruding toward the surface opposite to the surface facing the terminal main portion in the widthwise middle of the lock pinching portion and in contact with the core wire from a direction substantially perpendicular to the axis. The holding concave portion which forms a U-shaped core wire contacting edge at the leading edge of the lock holding portion, A pair of substantially triangular shapes which are provided so as to face the insertion hole, and which are inclined while gradually narrowing from both side portions sandwiching the concave portion to the intersection of the pair of sides forming the V-shape of the core wire contact edge. A lock terminal fitting comprising: a first guide surface; and a substantially triangular second guide surface which is provided between the first guide surfaces and gradually decreases toward the intersection.