JPH0923554A - Tubular rubber plug for cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a cable to be inserted easily, even with a terminal metal fitting set to the tip, and besides, to improve waterproofness. SOLUTION: To improve the waterproofness while inserting a cable 20 where a terminal metal fitting 30 or the like is pressure-welded to the tip, a crease- shaped waterproof wall 12 inclined frontward in the direction of insertion of a lead wire 20 is made from the inside periphery of a tube 11 in a tubular rubber plug 10 for cable, so, when inserting a terminal metal fitting 30 with a large diameter, it is inserted such that the wall widens frontward in the direction of insertion, and after insertion of the same terminal metal fitting 30, the wall recovers easily into thin-diameter condition, and sticks fast to the outside periphery of a thinnish cable 20 so as to waterproof it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular rubber plug for electric wires which allows electric wires to be inserted while waterproofing the inserted parts.

[0002]

2. Description of the Related Art Conventionally, as this type of tubular rubber plug for electric wires, one disclosed in Japanese Utility Model Laid-Open No. 2-119372 shown in FIGS. 5 and 6 is known. As shown in FIG. 6, a fold-shaped waterproof wall 2 having a chevron cross section is formed on the inner peripheral wall of the tube portion 1 through which an electric wire (not shown) is inserted. The fold-shaped waterproof wall 2 is inclined so as to be raised from both end opening sides of the tube portion 1, and when inserting an electric wire, the fold-shaped waterproof wall 2 is entirely elastically compressed in a rectangular direction orthogonal to the insertion direction, and is compressed. The repulsive force ensures close contact with the area around the wire for waterproofing.

[0003]

In the above-mentioned conventional tubular rubber plug for electric wire, there is a problem that the flexible range is narrow because it is closely attached to the electric wire by the repulsive force due to compression.
That is, when the terminal metal fitting is large, such as when the electric wire must be inserted with the terminal metal fitting crimped to the tip, it was extremely difficult to insert the wire. In this case, if the inner diameter of the terminal fitting is prioritized, even if the terminal fitting can be inserted, the outer circumference of the small-diameter electric wire cannot be kept waterproof.

The present invention has been made in view of the above problems, and provides a tubular rubber plug for an electric wire which allows an electric wire to be easily inserted even with a terminal metal fitting attached to the tip thereof and which is also waterproof. With the goal.

[0005]

In order to achieve the above object, the invention according to claim 1 is a tubular rubber plug for an electric wire in which a fold-shaped waterproof wall is formed on an inner peripheral wall of a pipe, wherein the fold-shaped waterproof wall is The inner circumference side is inclined forward in the insertion direction of the electric wire.

[0006]

In the invention according to claim 1 configured as described above, the inner peripheral side of the fold-shaped waterproof wall, which is an opening, is inclined toward the front side in the insertion direction of the electric wire, so that the electric wire is inserted. At times such as when opening, the diameter should be increased so that the open end is turned outward. This is bending due to extension rather than bending due to elastic compression, and is easily bent. Therefore, even when the terminal fitting is crimped to the tip, the opening is turned up when the terminal fitting is pressed, and the diameter is increased to allow insertion. On the other hand, if it is easy to bend, it can be easily restored, and after it is opened to a large size in accordance with the terminal fitting, it is shrunk to an opening diameter that comes into close contact with the outer periphery of the thin electric wire.

[0007]

As described above, according to the present invention, the range of the opening diameter that allows the insertion is large, the electric wire can be easily inserted even with the terminal metal fitting attached to the tip, and the electric wire having a small diameter can be closely attached. It is possible to provide a tubular rubber plug for electric wires that can be waterproof.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a tubular rubber plug for electric wire according to an embodiment of the present invention.

In the figure, the tubular rubber plug 10 for electric wire is
A cylindrical portion 11 that is formed in a generally tubular shape and through which the electric wire 20 can be inserted.
It has. A fold-shaped waterproof wall 12 is formed from a substantially central portion of both ends of the tubular portion 11 toward the inner peripheral side. In this embodiment, a tubular rubber stopper 1 for electric wire
0 has a tubular shape with a tubular portion 11, but the electric wire 2
It suffices that a through hole that allows 0 to be inserted is formed, and the entire shape need not be a general tubular shape. Therefore, a large number of through holes may be formed in one plate-shaped rubber plate to form the cylindrical portion 11 one by one. In addition, the waterproof wall 12 is the tubular portion 11
It suffices if at least one of them is formed inside, and a plurality of them may be formed or they may be formed to be shifted toward the opening end side. The electric wire tubular rubber plug 10 may be made of a material that can ensure water tightness and has elasticity, and may be made of rubber, synthetic rubber, resin, or the like.

The waterproof wall 12 is formed so as to be inclined toward the front side in the insertion direction of the electric wire 20. That is, the fold-shaped waterproof wall 12 extending from the inner peripheral wall of the tubular portion 11 to the inner peripheral side is not extended at right angles to the inner peripheral wall of the tubular portion 11,
The electric wire 20 is linearly extended with an inclination toward the front side in the insertion direction. Further, the waterproof wall 12 itself is formed in a substantially uniform thin film shape, and a through hole 12a is formed in the center. In the present embodiment, the waterproof wall 12 is formed in a linear shape, but it is sufficient that the inner peripheral side is inclined forward in the insertion direction of the electric wire 20, and even if it has a curved or curved shape. good. In addition, in the present embodiment, the thickness is uniform throughout, but, for example, as shown in FIG. 4, the inner peripheral wall side of the tubular portion 11 is thicker and gradually thinner toward the inner peripheral side. It may be.

A metal fitting 30 is attached to the tip of the electric wire 20 to be inserted.
Are connected by crimping. There is no particular limitation on the terminal fitting 30. Next, the operation of the present embodiment having the above configuration will be described. As shown in FIG. 1, the electric wire 20 having the terminal fitting 30 crimp-connected to the tip is inserted from the opening of the tubular portion 11 of the electric wire tubular rubber plug 10. When the tip of the terminal fitting 30 hits the waterproof wall 12, the inner peripheral side of the waterproof wall 12 is pushed forward in the insertion direction of the electric wire 20. There is no obstacle on the front side in the insertion direction of the electric wire 20, and as shown in FIG.
The waterproof wall 12 extends so as to turn over, and the through hole 12a is expanded.

Here, the waterproof wall 12 expands and expands in diameter, and is not compressed toward the inside of the waterproof wall itself as in the conventional case. Therefore, the force required for extension is small, and it can be inserted with a so-called low insertion force. When the terminal fitting 30 penetrates the waterproof wall 12 part,
The waterproof wall 12 tries to return to its original shape due to its elasticity, and as shown in FIG. 3, it comes into close contact with the outer peripheral surface of the electric wire 20 having an outer diameter slightly larger than the original opening diameter of the through hole 12a.
When returning, the waterproof wall 12 not only contracts due to the elasticity of the expanded diameter waterproof wall 12, but also the waterproof wall 12 extending obliquely from the inner peripheral surface of the tubular portion 11 inserts the terminal fitting 30 and the electric wire 20. The wire is flexed outwardly when the wire is urged, and the force of the inclination itself to return is also shared, so that the wire comes into closer contact with the outer peripheral surface of the electric wire 20. Thereby, the waterproof property can be further improved.

As described above, in order to ensure waterproofness while penetrating the electric wire 20 or the like to which the terminal fitting 30 or the like is crimped and connected at the tip, the tubular portion 1 of the tubular rubber plug 10 for tubular electric wire is provided.
A fold-shaped waterproof wall 12 that is inclined from the inner peripheral surface of the conductive wire 20 toward the front side in the insertion direction is formed. When inserting a terminal fitting 30 having a large outer diameter, the waterproof wall 12 is directed toward the front side in the insertion direction. After penetrating so as to be spread out, and after penetrating the terminal fitting 30, it easily returns to a small diameter state, adheres to the outer peripheral surface of the thin electric wire 20, and is waterproof.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a tubular rubber plug for electric wire according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a terminal metal fitting has started to be inserted into the tubular rubber plug for the electric wire.

FIG. 3 is a cross-sectional view showing a state in which a terminal fitting is passed through the tubular rubber plug for the electric wire.

FIG. 4 is a cross-sectional view showing a modified example of the tubular rubber plug for electric wires.

FIG. 5 is a front view of a conventional tubular rubber stopper for electric wires.

FIG. 6 is a sectional view of the tubular rubber plug for the electric wire.

[Explanation of symbols]

 10 ... Tubular rubber plug for electric wire 11 ... Cylinder part 12 ... Waterproof wall 12a ... Through hole 20 ... Electric wire 30 ... Terminal metal fittings

Claims (1)

[Claims] 1. A tubular rubber plug for an electric wire, wherein a fold-shaped waterproof wall is formed on an inner peripheral wall of the pipe, wherein the fold-shaped waterproof wall has an inner peripheral side inclined to a front side in an electric wire insertion direction. Tubular rubber stopper for electric wires.