JPS6019328Y2 - terminal fittings - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a terminal fitting suitable for connecting aluminum electric wires, particularly aluminum single wires.

In order to connect a single aluminum wire to a terminal fitting, it is best to provide a row of sharp protrusions on the upper edge of both side walls of the terminal fitting, curl them and press fit them into the aluminum conductor, so that they are crimped and engaged with the conductor. Conventionally, it has existed as a connection means to obtain suitable electrical and mechanical connection characteristics.

However, since the conventional protrusion is a triangular protrusion whose front and rear surfaces are formed by inclined surfaces, it has a drawback that the resistance force against the force in the direction of pulling out the conductor is small.

The object of this invention is to provide a terminal fitting that eliminates the above-mentioned drawbacks.

In order to achieve the above object, this invention forms the front and rear surfaces of each projection provided on the upper edge of both side walls of the terminal fitting with a surface including a vertical side and an inclined side, and forms a surface on one side wall. The protrusion formed on the other side wall and the protrusion formed on the other side wall are configured such that the positional relationship between the vertical side and the inclined side is reversed from front to back.

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

1 to 6 show a first embodiment of this invention.

The terminal fitting of this embodiment has opposing side walls 2 on both sides of a terminal fitting 1 made of a metal plate bent into a substantially U-shape, and a plurality of serrated protrusions 3° 3' are formed on the upper edge of each side wall 2. This is what I did.

Each projection 3° 3' is formed by an inclined surface 4 and a vertical surface 5, and the projection 3 formed on one side wall 2 and the projection 3' formed on the other side wall 2 are formed by the inclined surface 4. The positional relationship between the vertical plane 5 and the vertical plane 5 is reversed.

That is, each of the projections 3 has an inclined surface 4 on its rear surface and a vertical surface 5 on its bent front surface, whereas the projection 3' has a vertical surface 5 on its rear surface and an inclined surface 4 on its front surface.

However, as can be seen from the developed view of FIG. 2, the vertical front 5 of one side wall 2 and the inclined surface 4 of the other side wall 2 are formed at the same position.

Furthermore, the distance d between the valleys of the protrusions 3, 3' along the surface of the metal fitting material is set to a length sufficient to surround the outer periphery of the conductor A to be connected.

Therefore, as shown in FIGS. 3 and 4, when the protrusion 3゜3' is curled inward and press-fitted into the conductor A, the protrusion 3
, 3' are press-fitted with the peaks and valleys fitting together, and
The engaging outer edges of both side walls 2 (the envelope line of the valley showing the interval d in FIG. 2) abut each other in a straight line and are tightly closed, thereby preventing corrosion of the conductor A.

Further, as can be seen from FIGS. 5 and 6, the protrusion 3' is press-fitted with its inclined surface 4 facing forward and its vertical surface 5 facing backward, but the other protrusion 3 is press-fitted in the opposite manner. Since the vertical plane 5 is in the front, it is perpendicular to the direction in which the conductor A is pulled out (arrow in FIG. 6), and exhibits a large pullout resistance.

Incidentally, at the rear end of the side wall 2, an insulating layer gripping piece 6 of the conductor A is formed so as to protrude in the shape of a horn on both sides, and at the front end thereof, an appropriately shaped electrical contact part 7 is formed.

Next, in the second embodiment, as shown in FIG.
' is provided offset to the front of the side wall 2, and a flat portion 8 is formed at the rear end portion.

This flat portion 8 is somewhat press-fitted into the conductor, but since the tip is not sharp, stress is dispersed.

This embodiment maintains sufficient electrical connection characteristics at the front of the side wall 2, which is the conductor crimping portion, while compensating for the weakening mechanical characteristics of the conductor at the rear end of the side wall 2. It is possible to obtain better properties than conventional ones both mechanically and mechanically.

Furthermore, by providing the flat portion 8 with excellent mechanical gripping force at the rear end, it is possible to prevent deterioration of the connection due to force to pull out the wire from the terminal fitting or bending of the wire.

Incidentally, as shown in FIG. 8, minute irregularities 9 may be formed on the upper edge of the flat portion 8.

These minute irregularities 9 increase the bonding area between the flat portion 8 and the conductor A in order to replenish the bonding area between the protrusion 3゜3' and the conductor A that was reduced by adopting the flat portion 8. This is to facilitate press-fitting the upper edge into the conductor A.

In the third embodiment, as shown in FIG. 9, a chamfered portion 13 is formed at the top of the projection 3 and is inclined downwardly toward the outside of the side wall 2, which has the effect of reducing the press-fit resistance to the conductor.

Further, it is more preferable to form the chamfered portion 13 by cold working, since the strength of the tip portion of the protrusion 3 increases due to work hardening.

In the fourth embodiment, as shown in FIGS. 10 and 11, the front surface 11 and rear surface 12 of the protrusion 3 are inclined with respect to the inner surface of the side wall 2, and in this case as well, the press-fit resistance to the conductor is reduced. If the slope is formed by cold working, there will be an effect due to work hardening as in the case described above.

The same applies to the projection 3'.

The front surface 11 and the rear surface 12 are inclined with respect to the outward direction of the side wall 2, and the front surface of the protrusion 3 includes a vertical side 11' and the rear surface 12 includes an inclined side 12', and the same applies to the protrusion 3'. It is.

As described above, in the terminal fitting of this invention, the front surface of the protrusion formed on one side wall includes a vertical side, and the pull-out resistance against the conductor is large, and the front and rear surfaces of one protrusion and the other protrusion are Since they have an inverse relationship, they can be inserted into the conductor without colliding with each other, and good electrical and mechanical connection characteristics can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the first embodiment, Fig. 2 is a developed view thereof, Fig. 3 is a plan view in use, Fig. 4 is an enlarged sectional view, Figs. 5 and 6 are sectional views thereof, 7 and 8 are perspective views of the second embodiment, FIG. 9 is a partially enlarged perspective view of the third embodiment, FIG. 10 is a partially enlarged side view of the fourth embodiment, and FIG. 11 is a partially enlarged side view of the fourth embodiment. X-
FIG. 3 is an X-ray cross-sectional view. 1...Terminal fitting, 2...Side wall, 3,3
′... Protrusion, 4... Inclined surface, 5...
...Vertical surface.

Claims (5)

[Scope of utility model registration request] (1) In a terminal fitting that has opposing side walls on both sides and a plurality of protrusions on the upper edge of each side wall, the front and rear surfaces of each of the protrusions are formed by surfaces including vertical sides and inclined sides, and one A terminal fitting characterized in that the protrusion formed on one side wall and the protrusion formed on the other side wall move forward and backward in the positional relationship between the vertical side and the inclined side. (2) The terminal fitting according to claim (1) of the utility model registration, characterized in that a chamfered portion is formed at the top of the protrusion and is inclined downwardly toward the outside of the side wall. (3) The terminal fitting according to claim (1), wherein each of the front and rear surfaces on which the protrusion is formed is inclined with respect to the outward direction of the side wall. (4) The distance between the valleys of the protrusions formed on one side wall and the valleys of the protrusions formed on the other side wall along the metal material surface is set to a length sufficient to surround the outer periphery of the conductor to be connected. The terminal fitting according to claim (1) of the utility model registration claim, characterized in that: (5) the protrusion is formed to be biased toward the front of the upper edge of the side wall;
The terminal fitting according to claim (1) of the utility model registration, characterized in that a flat portion is formed at the rear end portion.