JP2596131Y2 - Mold for connector waterproof plug - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for forming a waterproof plug for a connector. A mold for molding a substantially tubular rubber waterproof plug, particularly for use with ultra-fine electric wires, in which an electric wire insertion hole formed along an axis has an extremely small diameter and is long with respect to the diameter. When it is necessary to improve the strength of the pin for forming the electric wire insertion hole.

[0002]

2. Description of the Related Art As shown in FIG. 5, a waterproof plug 3 of a tubular rubber product is fitted around the end of an electric wire 2 for crimping a terminal 1, as shown in FIG. 3
The core wire barrel portion 1 of the terminal 1 is connected to the core wire 4 of the electric wire 2 protruding from the
a, and the coating barrel portion 1b is crimped on the outer periphery of the distal end portion of the waterproof plug 3, and in this state, as shown in FIG.
The waterproof plug 3 is inserted into the terminal accommodating chamber 6 of the connector 5, and the outer peripheral surface of the waterproof plug 3 is pressed against the connector inner wall 5 a to prevent water from entering from the terminal insertion port 7.

[0003] As described above, the waterproof plug 3 has the electric wire insertion hole 3a for inserting the insulating coating of the electric wire 2 along the axis, and the inner peripheral surface of the electric wire insertion hole 3a is for improving the sealing property. The protrusions 3b are provided at intervals in the axial direction. Similarly, on the outer peripheral surface of the waterproof plug 3, the connector inner wall 5 is also provided.
In order to improve the sealing performance with respect to a, the projections 3c are protruded at intervals in the axial direction.

[0004] Conventionally, the waterproof plug 3 having the above-described structure is a conventional type.
It is molded by the metal mold shown in FIG. The molding die includes a first die A provided with a pin 8 for forming the electric wire insertion hole 3a, a second die B operating in close proximity to the first die A, and a waterproof plug 3. It comprises a third mold C having a mold surface for molding the outer peripheral surface. The first mold A and the second mold B are opposed to each other as shown in the drawing, and a third mold C is fixedly arranged between the first mold A and the second mold B. The waterproof plug 3 is formed by moving the first mold A and the second mold B closer to the third mold C.

That is, the pins 8 of the first mold A are inserted into the mold surface 9 of the through-hole shape of the third mold C, and the first mold A
Mold surface 10A of second mold B and mold surface 10B of second mold B
To form a waterproof plug molding cavity, and the cavity is filled with rubber and molded. Therefore, the length L1 of the pin 8 is set to be the same as the length L2 of the wire insertion hole 3a, and the outer diameter is set to be substantially the same as the inner diameter of the wire insertion hole.

[0006]

[Problem to be Solved by the Invention] Since the mold for forming the waterproof plug has the above-described structure, when the electric wire is a very fine wire having a diameter of 1 mm or less, the diameter of the pin 8 is also 1 mm or less, and even in that case, the length is 5 to 5 mm. Since about 6 mm is required, the pin 8 has an extremely elongated shape.

Moreover, since the small diameter pin 8 is provided with the concave portion 8a for forming the sealing convex portion 3b, the diameter of the concave portion 8a is further reduced, and the pin 8 is easily broken.

As described above, the pin 8 has an extremely small diameter, and
Due to the long length, the strength is low, and breakage easily occurs due to the pressure applied during molding. Further, when the pin 8 is pulled out after molding, the recess 8a is filled and protruded, but the projection 3b of the waterproof plug is caught, which also has a disadvantage that the pin 8 is easily bent or damaged.

The present invention has been made in view of the above-mentioned drawbacks, and has as its object to increase the strength of a pin for forming an electric wire insertion hole of a mold and prevent the pin from being deformed and damaged.

[0010]

According to the present invention, in order to achieve the above object, a terminal crimping wire is inserted through an electric wire insertion hole provided along an axis, and an outer peripheral surface is brought into close contact with an inner wall of the connector, so that a terminal of the connector is provided. As a mold for forming a substantially tubular rubber waterproof plug for waterproofing the accommodation chamber, pins for forming the electric wire insertion holes are respectively protruded from a pair of opposedly arranged molds which are operated in close proximity to each other. It is characterized in that the tips of the pins are abutted when the mold is approached, and that the sum of the lengths of the pins on both sides where the tips are abutted corresponds to the entire length of the wire insertion hole. The present invention provides a mold for forming a waterproof plug for a connector.

[0011] The waterproof plug formed by forming an annular concave portion at an outer peripheral surface of each pin of the above-mentioned molding die with an interval in the axial direction and forming a sealing convex portion on the inner peripheral surface of the electric wire insertion hole,
The abutting surface of each of the pins is set at a portion other than the concave portion, and the length of the pins on both sides is set to a length at which moments applied to the roots of these pins are almost uniformly applied during molding. ing.

Since the molding die has the above structure and one pin, which has conventionally been protruded from one of the dies, is divided into two and shortened, the projection is protruded from the dies on both sides. The strength of the pin can be increased, and breakage and deformation of the pin, which is likely to occur during molding, can be prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments shown in the drawings. As shown in FIG. 1, a molding die includes a first die A and a second die B which are disposed to face each other, and a third die C which is disposed between the first die A and the second die B. Consists of The third mold C is fixed similarly to the above-described conventional example, and has a through hole having a mold surface 9 that forms the outer peripheral surface of the waterproof plug 3.

The first mold A and the second mold B which are arranged on both sides of the third mold C and are moved toward and away from each other are provided with the third mold C.
Mold surfaces 10A, 1 abutting on both side end surfaces 10c, 10c, respectively.
The pins 12 and 13 are provided so as to be opposed to each other on the same axis from 0B.

The sum of the length L3 of the pin 12 and the length L4 of the pin 13 is the length L of the wire insertion hole 3a of the waterproof plug 3 to be formed.
2 is set to match. (L3 + L4 = L2)
As described above, the pin for forming the electric wire insertion hole, which has been conventionally one, is divided into two parts.
The molding pressure applied to 2 and 13 is set at a position where the molding pressure is substantially equal.

The outer peripheral surfaces of the pins 12 and 13 have a substantially V section.
The U-shaped concave portions 12a and 13a are formed in an annular shape, and a sealing convex portion 3b projecting from the inner peripheral surface of the electric wire insertion hole 3a is formed. The recesses are not formed at the tips of the pins 12 and 13, and the abutment surfaces 1 are close to each other.
At the position where 2b and 13b abut each other, no concave portion is formed on the front end joining surface. This is to prevent burrs from being generated at the sealing convex portion 3b of the molded waterproof plug.

The steps of forming a waterproof plug using the molding die of the present invention are as shown in FIGS. 1 to 3, wherein the first die A and the second die on both sides of the fixed third die C are shown. As shown in FIG. 2, the mold B is moved close to the mold B, and the cavity formed by the molds A, B, and C is filled with rubber to form the waterproof plug 3. After forming the waterproof plug 3, as shown in FIG. 3, the first mold A and the second mold B on both sides are retracted, and the pin 1 is inserted through the wire insertion hole 3a of the molded waterproof plug 3.
Pull out 2,13 respectively.

When the pins 12 and 13 are pulled out, the pins 12 and 13 are easily pulled out due to their short length, and the number of the sealing projections 3b serving as pull-out resistances of the pins 12 and 13 is reduced. The pin can be easily pulled out. In addition, the deformation and breakage of the pin that occurred when the pin was pulled out can be prevented.

[0019]

As is clear from the above description, in the molding die according to the present invention, the pin, which was conventionally one, is divided into two, so that the length of the two divided pins is of course. However, when the diameter is the same, the strength of each pin can be made larger than before. Moreover,
One end of each of these divided pins is supported by a mold,
Whereas one long pin was cantilevered at one location, it was divided into two pins and supported separately, and two pins on both sides were supported.
Since the pin is supported at the location, the supporting strength of the pin can be greatly increased.

As described above, since the strength of the pins themselves is increased and the supporting strength is increased to enable stable support, for example, when the diameter of each pin is 1 mm or less, the sum of the lengths of the pins is 5 mm or less. Effectively reduces pin deformation and breakage even in waterproof plug molds for ultra-fine wires of up to about 6 mm.
Can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a molding die according to the present invention.

FIG. 2 is a sectional view at the time of molding by a molding die of FIG.

FIG. 3 is a cross-sectional view after completion of molding by the molding die of FIG. 1;

FIG. 4 is a perspective view of FIG.

FIG. 5 is a partial cross-sectional view of a terminal crimped electric wire to which a waterproof plug is attached.

6 is a cross-sectional view showing a state where the terminal of FIG. 5 is attached to a connector.

FIG. 7 is a cross-sectional view of a conventional molding die.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Terminal 2 Electric wire 3 Waterproof plug 3a Electric wire insertion hole 3b, 3c Convex part for sealing A 1st die B 2nd die C 3rd die 8 pin 12, 13 pin 12a, 13a Concave part 12b, 13b Tip butting surface

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) H01R 43/00 H01R 13/52 301 B29C 33/44 B29L 31:36 B29K 21:00

Claims (2)

(57) [Scope of request for utility model registration] A substantially tube-shaped rubber waterproof plug for inserting a terminal crimping wire into an electrical wire insertion hole provided along an axis line and for sealing the terminal accommodating chamber of the connector by adhering an outer peripheral surface to an inner wall of the connector. Pins for forming the electric wire insertion holes are respectively protruded from a pair of molding dies which are arranged close to each other, and the tips of the pins are abutted when the dies approach each other. A mold for forming a waterproof plug for a connector, wherein the sum of the lengths of the pins on both sides of which the tips are connected to each other is set so as to correspond to the entire length of the electric wire insertion hole. 2. An outer peripheral surface of each of the pins is provided with an annular recess at an axial interval, and a tip abutting surface of each of the pins is set at a portion other than the recess, and a length of both side pins is set. Is loaded at the root of these pins during molding
The molding die for a waterproof plug according to claim 1, wherein the moment is set to a length at which the moment is applied substantially evenly.