JP2000348788A - Press-contact terminal fitting and manufacture of press- contact terminal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure contact reliability between a press-contact blade and a wire without carrying out post-plating to a cut surface produced in forming the press-contact blade by stamping. SOLUTION: This press-contact terminal fitting has a shape wherein the inward edge of a blade 12 bent and raised inward nearly at a right angle from a wall part 11 is formed into a press-contact blade and is shaped by forming the blade 12 capable of being bent and raised at a part of the wall part 11 by stamping a flat plated metal plate material and thereafter bending the wall part 11 and the blade 12. The press-contact blade is formed by cutting a bent part 19A bent in nearly parallel with the wall part 11 at the middle part of the blade 12 along a cut guide surface 20 inside the bend of the blade 12 and nearly perpendicular to the wall part 11. The plated surface outside the bent of the blade 12 is formed into an opposite end face 14 to be abutted on the core of a wire.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure terminal fitting.

[0002]

2. Description of the Related Art A press-connecting terminal fitting has a pair of blades which are bent inward at substantially right angles by being cut and raised from a pair of walls, and whose opposed inward edges are press-contact blades. The resin coating of the electric wire is cut with a press contact blade as the electric wire is fitted into the wire, and the opposite end face of the press contact blade is brought into conductive contact with the core wire of the electric wire.

[0003] In manufacturing such press-contact terminal fittings, a plate-shaped conductive metal plate having a predetermined thickness is plated, and then the metal plate is punched into a predetermined shape to form a part of a wall. A blade surrounded by a U-shaped slit is formed on the flat metal plate, and the flat metal plate is bent so that the wall is raised and the blade is bent inward so that the pressure contact blades face each other. . At this time,
The opposing end face of the press contact blade that comes into contact with the core wire of the electric wire is not plated because it is a fracture surface at the time of punching. Since this fractured surface is not smooth, there is a problem in terms of contact reliability if it is brought into contact with the core wire as it is. Therefore,
As a post-plating process, plating is generally performed on a fractured surface (opposing end surface). However, performing the post-plating process means that the number of steps is increased, so that there is a problem that the cost is high. .

One example of the solution is disclosed in Japanese Patent Application Laid-Open No. 10-2614.
No. 42 discloses this. In this, as shown in FIG. 10, a plated surface of the blade 100 other than the fractured surface 101 is bent into an L shape, and a flat surface 102A outside the bent portion 102 is brought into contact with an electric wire (not shown). The configuration is described.

[0005]

However, as described above, L
In the form bent in the shape of a letter, since the bending portion 102 is in a cantilevered support state, there is a possibility that the bending portion 102 is deformed inward due to the pressing force received from the wire side during pressure welding, and as a result, the resin coating of the wire is sufficiently reduced. However, there is a possibility that problems may occur such that the incision cannot be made at once, or even if the incision is made, the contact pressure with the core wire is not secured.

The present invention has been made in view of the above circumstances, and aims to secure contact reliability between a press contact blade and an electric wire without performing post-plating processing on a fracture surface generated when forming a press contact blade by punching. The purpose is.

[0007]

According to a first aspect of the present invention, a pair of blades are bent inward at a substantially right angle from a pair of parallel wall portions, and the opposed inward edges of the pair of blades are pressed against each other. By pressing an electric wire between the pair of blades, the resin coating of the electric wire is cut by the press-contact blade, and a pressure contact is made so that opposing end faces of the press-contact blade face each other to contact the core wire of the electric wire. A terminal fitting, formed by punching a plated flat metal plate material to form the blade that can be bent and raised in a part of the wall portion, and then bending the wall portion and the blade. Wherein the press-contact blade is formed by breaking a bent portion bent in the middle of the blade along the surface of the blade, and forming the press-contact blade outside the bent portion of the blade in the blade. The Tsu key treated surface, it has a structure in which the said opposing end surfaces to be contacted with the core wire.

According to a second aspect of the present invention, a pair of blades are bent inward at substantially right angles from a pair of parallel wall portions, and the opposed inward edges thereof are press-contact blades. A press-connecting terminal fitting which presses an electric wire between the pair of blades to cut a resin coating of the electric wire with the press-connecting blade and to bring opposed end surfaces of the press-connecting blade facing each other into contact with a core wire of the electric wire. In the method of manufacturing, a plating process is performed on the surface of a flat metal plate material, and the metal plate material is punched in a flat shape to form the blade capable of being bent and raised on a part of the wall portion, In forming the wall portion and the blade into the form by bending the metal plate material, in the bending process of the metal plate material, the blade is bent and raised substantially at right angles to the wall portion. Forming a bent portion by bending the blade substantially in the middle thereof substantially in parallel with the wall portion, and breaking the bent portion along a plane inside the bending of the blade and substantially perpendicular to the wall portion. Forming the pressure contact blade with
The pair of wall portions are bent so as to be parallel to each other, so that the plating-treated surfaces of the blade outside of the bending are opposed to each other as the opposed end surfaces capable of contacting the core wire.

[0009]

Advantageous Effects of the Invention [Inventions of Claims 1 and 2] One of the corner edges constituting the pressure contact blade is a sharp edge portion because it is continuous with the fracture surface along the surface of the blade. In addition, the resin coating of the electric wire can be reliably opened. Further, since the opposed end face of the press contact blade is substantially within the range of the plate thickness of the blade, even if a press force is received from the electric wire side during the press contact, the press force can be reliably received without deformation. In addition, since the opposite end surface uses the portion plated before punching as it is, a highly reliable contact state with the core wire can be secured without post-plating.

[0010]

[First Embodiment] A first embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 and 2, the press contact terminal fitting 10 of the present embodiment includes a pair of wall portions 11 that are parallel to each other, and a pair of blades 12 that are bent inward at substantially right angles from the two wall portions 11. The inwardly facing edges of both blades 12 facing each other are pressure contact blades 13. The press-contact of the electric wire 30 to the press-connecting terminal fitting 10 is performed between the pair of wall portions 11 in a state where the press-connecting terminal fitting 10 is assembled to a housing (not shown) or set in a press-fitting jig (not shown). The electric wire 30 is dropped in a parallel direction, placed on the upper edge of the blade 12, and the electric wire 30 is pressed in this state. Due to this pressure contact, the resin coating 31 of the electric wire 30 is cut by the pressure contact blade 13 and
Opposing end surfaces 14 are in contact with the core wire 32 of the electric wire 30.

First, in a first step, a flat conductive metal plate (not shown) is plated (not shown) in a first step, and a second step is performed. Then, the plated flat metal plate material is punched by a press, so that the wall portion 11 is formed.
(See FIGS. 3 and 4). The blades 12 are formed in a pair of front and rear, a total of four pieces, and are formed by punching a substantially H-shaped slit in each of the left and right wall portions 11. The slit is a lower edge slit 17A long in the front-rear direction along the fold line 16 between the bottom plate 15 and the wall portion 11, and a wide upper edge slit 17B parallel to the lower edge slit 17A.
And a side edge slit 17C communicating between the lower edge slit 17A and the upper edge slit 17B. Plating remains on the surface of the blade 12 formed by such slits (surface flush with the wall portion 11).
No plating is present on the lower edge surface 12A, upper edge surface 12B, and side edge surface 12C (the inner peripheral surface of the slit) of the blade 12.

Next, in a third step, the upper edge slit 17 is formed.
Each of the blades 12 is bent at a substantially right angle to the wall portion 11 along a fold line 18 connecting the front end and the rear end of the lower edge slit 17A with each other (see FIG. 5). The bent blade 12 is bent in the middle to form a bent portion 19 substantially parallel to the wall portion 11 (see FIG. 6). The bending position of the bending portion 19 is determined by the upper edge surface 12B of the blade 12.
The boundary between the surface 12B-1 parallel to the lower edge slit 17A and the inclined surface 12B-2. Next, the fifth
In the process, a part of the bent portion 19 is
(A surface of the blade 12 which is a component of the present invention) (see FIG. 7). The breaking guide surface 20
Is a plane inside the bend of the blade 12 and substantially perpendicular to the wall 11. The pressure-contact blade 13 is formed by this rupture, and a part of the edge portion constituting the pressure-contact blade 13 becomes a fracture surface 21 where no plating is present. Since the fracture surface 21 faces forward or rearward orthogonal to the length direction of the electric wire 30, it does not face the core wire 32 of the electric wire 30. The opposing end face 14 of the press-contact blade 13 that is outside the bend and that faces the core wire 32 is formed by bending the plated surface of the blade 12 and remains without being cut off by breaking. Therefore, plating is left on the opposite end surface 14 of the press-contact blade 13.

Next, in a sixth step, the protruding amount of the blade 12 from the wall portion 11 is reduced to a predetermined size by subjecting the opposing end face 14 on which the plating is left to flap processing (FIG. 1). 8). Finally, in a seventh step, the wall portion 11 is bent so as to rise from the bottom plate portion 15 at a substantially right angle. Thereby, a pair of left and right pressure contact blades 13
However, the inward facing end surfaces 14 are connected to the core wire 3 of the electric wire 30.
A state is established in which the correspondences are made at predetermined intervals slightly smaller than 2 (see FIG. 2).

As described above, in the present embodiment, one of the corners 13A constituting the press-contact blade 13 is formed on the inner surface of the bend which is substantially perpendicular to the wall 11 of the blade 12 (the fracture guide surface 20). Is connected to the fracture surface 21 along the edge of the wire 30, thereby forming a sharp edge portion.
Can be reliably incised. Further, since the opposed end surface 14 of the press contact blade 13 is substantially within the range of the plate thickness of the blade 12, the blade 12
Even if a pressing force in the direction along the plate surface is received, the pressing force can be reliably received without deformation. Therefore, the resin coating 31 can be reliably incised.
Moreover, since the facing end surface 14 uses the surface of the blade 12 plated before punching as it is, a highly reliable contact state with the core wire 32 can be secured without post-plating. .

Further, since the bent portion 19 of the blade 12 is bent toward the opening 11A side largely opened in the wall portion 11 by bending and raising the blade 12, the broken piece 19A generated by the breakage is removed from the opening 11A. It can be discharged from 11A to the outside. Therefore, there is no possibility that the broken pieces 19 </ b> A remain between the wall portions 11. [Other Embodiments] The present invention is not limited to the embodiment described above with reference to the drawings. For example, the following embodiments are also included in the technical scope of the present invention. Various changes can be made without departing from the scope of the invention.

(1) In the above embodiment, a pair of front and rear blades are provided so that the fracture surface is located on the rear surface of the front blade and on the front surface of the rear blade. May be reversed from the above embodiment, both the front and rear blades may be located on the front surface, and both the front and rear blades may be located on the rear surface.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a press contact terminal fitting of a first embodiment.

FIG. 2 is an enlarged perspective view showing a blade and a press contact blade.

FIG. 3 is a plan view showing a wall portion and a blade in an unfolded state.

FIG. 4 is a partially enlarged perspective view showing the blade in a deployed state.

FIG. 5 is an enlarged perspective view showing a state in which the blade is bent and raised from a deployed state.

FIG. 6 is an enlarged perspective view showing a state in which the bent blade is further bent.

FIG. 7 is an enlarged perspective view showing a state in which a part of a blade is broken.

FIG. 8 is an enlarged perspective view showing a state in which a sizing process has been performed after the fracture.

FIG. 9 is a partially enlarged cross-sectional view showing a state where the electric wires are pressed against each other.

FIG. 10 is a partially enlarged perspective view showing a conventional pressure contact blade.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Pressure contact terminal fitting 11 ... Wall 12 ... Blade 13 ... Pressure contact blade 14 ... Opposite end surface (plated surface) 19 ... Bending part 21 ... Broken surface 20 ... Break guide surface (surface of blade)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Eiji Kojima 1-114, Nishisuehirocho, Yokkaichi-shi, Mie Sumitomo Wiring Systems, Ltd. (72) Inventor Ning Saito 1-10-7, Kikuzumi, Minami-ku, Nagoya-shi, Aichi Prefecture No. F-term in Harness Research Institute, Inc. (reference) 5E012 AA14 5E063 GA02 GA08 XA01

Claims (2)

[Claims] 1. A pair of blades are bent inward at substantially right angles from a pair of parallel wall portions, and their facing inward edges are press-contact blades, and an electric wire is provided between the pair of blades. Press-fitting, the resin coating of the electric wire is cut with the press-contact blade, and the opposed end faces of the press-contact blade facing each other are brought into contact with the core wire of the electric wire. After forming the blade capable of being bent and raised in a part of the wall portion by punching a metal plate material in a shape of, a bent portion of the wall portion and the blade is bent in the middle of the blade. The press-contact blade is formed by breaking the bent portion along the surface of the blade, and the plated surface of the blade outside the bend of the bent portion is brought into contact with the core wire. Pressure contact terminal fitting, characterized in that the said opposed end faces to be. 2. A pair of blades, wherein a pair of blades are bent inward at substantially right angles from a pair of mutually parallel wall portions, and the inward edges facing each other are press-contact blades. A method of manufacturing a press-connecting terminal fitting in which the resin coating of the wire is cut with the press-connecting blade and the opposed end faces of the press-connecting blade facing each other are brought into contact with the core wire of the wire by pushing the wire between the wires. Then, a plating process is performed on the surface of the flat metal plate material, and the metal plate material is punched in a flat shape to form the blade that can be bent and raised on a part of the wall portion, and the metal plate material is bent. In forming the wall portion and the blade into the form by processing, in the bending process of the metal plate material, the blade is bent and raised substantially at right angles to the wall portion, A bent portion is formed in the middle by bending substantially parallel to the wall portion, and the bent portion is broken along a surface inside the bending of the blade and substantially perpendicular to the wall portion, so that the pressure contact is made. A blade is formed, and the pair of wall portions are bent so as to be parallel to each other, so that the plating-treated surfaces on the outside of the bend in the blade are opposed to each other as the opposed end surfaces capable of contacting the core wire. Manufacturing method of insulation displacement terminal fittings.