JPH0222940Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to the structure of a terminal for electric wires with a rubber stopper.

Conventionally, the end of an electric wire with a rubber plug inserted therein is connected to a terminal by caulking, and the rubber plug closes the wire draw-out side of a storage chamber with respect to the terminal formed inside the connector housing. It is generally practiced to maintain waterproof function. In this case, the connection of the end of the electric wire with the rubber plug to the terminal is shown in FIG. 1, for example, as disclosed in Japanese Utility Model Application No. 57-30978. In other words, conventional terminals for electric wires with rubber plugs
A′ consists of an electrical contact part a ₁ , _a conductor crimping part _{a 2} and a wire crimping part a ₃ with a rubber stopper. At the same time, the terminal insulating part b ₂ of the electric wire B is fixed by crimping at the rubber stoppered electric wire crimping part a ₃ via the gou plug C' inserted into the terminal insulating part b ₂ . There is. For example, as shown in the perspective view in FIG. 2, the rubber stopper C' inserted into the electric wire B has a small diameter part C ₁ at the front, a large diameter part C ₂ at the rear, and a large diameter part C ₂ . An annular rib _C3 is provided around the outer periphery of the terminal A', and crimping at the wire crimping portion _a3 with a rubber plug of the terminal A' is performed at the small diameter portion _C1 of the rubber plug C'.

FIG. 3 shows a sectional view taken along the line E--E of FIG. 1.

However, the conventional rubber stoppered electric wire terminal A' as described above has the following drawbacks. That is, the structure of the wire clamping part _a3 with rubber plug of terminal A' is shown in Figure 4 a.
As shown in FIG. 4b, which is a vertical cross-sectional view of FIG. _4A and a Rollo cross-sectional view of FIG. ₃
When the small diameter portion _C1 of the rubber stopper C' inserted into the covered wire B is tightened, the cross section of that portion becomes as shown in the sectional view of FIG. That is, the opposing caulking piece tips a ₃ ″ of the caulking portion a ₃ are caulked and crimped to the small diameter portion C ₁ of the rubber plug C′ and closely engage with the circumferential surface of the rubber stopper C′, but the caulking portion
The surface C ₂ ′ of the rubber stopper that comes into contact with the base a ₃ ′ of a ₃ is pressed against the smooth curved base a ₃ ′ and becomes a smooth curved surface.
When the rubber stopper C' is pulled in the direction of the arrow L by some external factor, or when the electric wire B is bent in the direction of the arrow L' (the direction opposite to the surface C ₂ ' of the rubber stopper), the base The rubber plug surface C ₂ ′ that comes into contact with a ₃ ′ slides relatively easily, and the rubber plug C _′ is distorted as shown by the broken line in _the figure. base
It comes off from _a3 ' and comes out, and finally it also comes off from the crimping part _a3 , and the entire rubber plug C' is detached from the terminal crimping part _a3 , and is used for purposes such as maintaining the waterproof function of the electrical contact part mentioned above. There are drawbacks that you won't get.

The present invention was developed by focusing on the drawbacks of the conventional terminals for electric wires with rubber plugs. An object of the present invention is to provide a terminal for electric wires with a rubber stopper that does not come off from a tightening part.

The present invention will be described below with reference to the accompanying drawings showing embodiments.

Fig. 5a is a vertical sectional view mainly showing the rubber plugged wire clamping part 1 showing the main parts of the terminal for electric wires with rubber plugs of the present invention, and Fig. 5b is a sectional view taken along the line H--H in Fig. 5a. shows.

Terminal A of the present invention is the conventional terminal shown in Figure 1.
Similar to A', there is an electrical contact part (not shown) in the front, a wire conductor clamping part 2 in the middle, and a rubber plug with a larger diameter and expanding outward than the wire conductor clamping part 2 in the rear. It has a terminal structure in which wire crimping parts 1 are arranged in series,
The present invention is characterized by the structure of the electric wire crimping section 1 with rubber plug. That is, the electric wire crimping part 1 with a rubber stopper of the terminal according to the present invention is arranged above the middle part of the curved base part 1b in a direction perpendicular to the terminal axis direction and approximately parallel to the curved surface of the base end part 1b. A bridged protrusion 3 is formed inside the electric wire crimping part 1 with a rubber stopper.

Therefore, the protrusion 3 is formed by providing two notches corresponding to the width and length of the protrusion 3 in the middle part of the base part 1b of the wire crimping part 1 with a rubber stopper, and by bending the part between these notches inward. It can be easily formed.

In addition, a slit (not shown) is provided in the base portion 1b near the rear end of the wire crimping portion 1 with a rubber plug, so that the base portion 1
The protrusion can also be formed by bending the rear end of b inward.

FIG. 6 is a perspective view of a rubber plug C used in the rubber plug-equipped electric wire terminal A of the present invention. The conventional rubber plug C _' shown in FIG. _Four
It is formed into a structure with a surrounding structure.

FIG. 7 is a longitudinal cross-sectional view showing a state in which an electric wire B with a rubber plug is crimped and crimped using the terminal A for electric wire with a rubber plug of the present invention.Please refer to FIGS. 5 and 6 for the effects of the present invention. I will explain.

First, the conductor b _1, which is obtained by peeling the end portion of the electric wire B into which the rubber plug C is inserted, is crimped in the conductor crimping part 2.
Next, the insulation coating part b ₂ of the electric wire B is crimped together with the small diameter part C ₁ of the rubber plug C inserted on the outer periphery of the electric wire B in the wire crimping part 1 with rubber plug. Then, the opposing crimping pieces 1a are crimped and crimped at the small diameter portion _C1 of the rubber stopper C, and engage with the rear part of the annular rib _C4 at the tip of the rubber stopper, as well as the base part of the wire crimping part 1 with the rubber stopper. The protrusion 3 bridged above 1b partially compresses the small diameter part _C1 of the rubber stopper, while the compression rate of the rubber stopper by the base part 1b in front of the protrusion 3 decreases and the annular rib C at the tip of the rubber stopper decreases. ₄ is no longer compressed smoothly,
The protrusion 3 pressed against the small diameter part _C1 of the rubber plug is an annular rib.
It is engaged with the rear part of C ₄ to the same degree as the engagement in the caulking piece 1a.

Therefore, the rubber plug can be almost completely prevented from coming off backward, which conventionally tends to occur in the rubber plug-equipped wire crimping section 1 due to the application of an external force.

As mentioned above, the present invention has an electrical contact part on the front part,
A terminal including a wire conductor clamping part in the middle part and a wire clamping part with a rubber plug whose diameter is larger than the wire conductor clamping part in the rear part, a small diameter part and a large diameter part, and the terminal has a small diameter part and a large diameter part. The distal end of the part is made up of a rubber stopper with an annular rib surrounding it, and the base of the wire crimping part with the rubber stopper is cut and raised by a slit in a direction perpendicular to the terminal axis direction, and is raised along the curved surface of the base. A bridged protrusion is provided inside, the protrusion is crimped and fixed by a wire crimping part so as to engage with the annular rib of the rubber plug, and the protrusion bites into the rubber plug in a curved shape. Because of its characteristics, it is possible to form a relatively large protrusion in the wire crimping part with a rubber plug by cutting and raising, and the sharp end formed by cutting and raising can be engaged with the annular rib of the rubber plug. The protrusion cut and raised by the slit can be cut into the outer circumference of the rubber stopper in response to the tightening pressure, so that it can be positioned and locked securely. The rubber plug is reliably fixed to the terminal in response to changes in the diameter of the rubber plug portion, and from this point of view as well, it is effective in preventing the rubber plug from coming off backwards.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a state in which a rubber-capped electric wire is crimped and crimped to a conventional rubber-capped electric wire terminal, Fig. 2 is a perspective view of a conventional rubber plug, and Fig. 3 is the same as that shown in Fig. 1. 4a is a vertical sectional view of the crimping part of a conventional electric wire terminal with a rubber stopper, FIG. 4b is a sectional view of the roller of FIG. 4a, and FIG. A vertical cross-sectional view of the caulking part of the terminal for electric wire with a rubber plug, FIG. 5b is the same as that of FIG.
Fig. 6 is a perspective view of the rubber stopper used in the present invention, and Fig. 7 is a longitudinal cross-sectional view showing a state in which an electric wire with a rubber stopper is crimped and crimped using the rubber stoppered electric wire terminal of the present invention. It is. 1...Wire crimping part with rubber plug, 1a... crimping piece,
1b...Base part, 2...Conductor clamping part, 3...Protrusion, A, A'...Electric wire terminal with rubber plug, B...Wire, C'...Conventional rubber plug, C...Book Rubber stoppers used in the design, C ₁ ... small diameter part of the rubber stopper, C ₂ ... large diameter part of the rubber stopper, C ₄ ... annular rib.

Claims (1)

[Scope of utility model registration request] Electrical contact part at the front, wire conductor tightening part at the middle part,
A terminal is provided with a wire clamping part with a rubber plug that is larger in diameter than the wire conductor clamping part in a row at the rear, a small diameter part and a large diameter part, and an annular rib is provided at the tip of the small diameter part. The base of the electric wire crimping part with the rubber plug has a protrusion cut out by a slit in a direction perpendicular to the terminal axis direction and bridged along the curved surface of the base. A terminal for an electric wire with a rubber plug, characterized in that the projection is crimped and fixed by a wire crimping part so as to engage with an annular rib of the rubber plug, and the projection bites into the rubber plug in a curved shape. .