JPH0584083U - Mold for connector waterproof plug - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the strength of the pin for forming the wire insertion hole and prevent the pin from being deformed or damaged. [Structure] Molded metal with a substantially tubular rubber waterproof plug for inserting a terminal crimping wire into an electric wire insertion hole provided along an axis and for sealing the outer peripheral surface of the connector inner wall to waterproof the terminal accommodating chamber of the connector. A pair of molds, which are arranged to face each other and are operated in proximity to each other, are provided with pins for forming the wire insertion holes, respectively, and when the molds approach each other, the tips of the pins are butted. The sum of the lengths of the pins on both sides where the tips are abutted and continuous is set so as to correspond to the total length of the wire insertion hole.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mold for a connector waterproof plug. More specifically, it is attached to the outer peripheral surface of a crimped terminal wire and attached to the inner wall of the connector to waterproof the terminal accommodating chamber of the connector. A mold for molding a plug, particularly when it is necessary to make an electric wire insertion hole formed along an axis a very small diameter and long for the extra-fine electric wire, It is intended to improve the strength of the pin for forming the wire insertion hole.

[0002]

[Prior Art]

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

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 improves the sealing property. Therefore, the protrusions 3b are provided so as to be spaced apart in the axial direction. Similarly, on the outer peripheral surface of the waterproof plug 3, in order to improve the sealing performance with respect to the connector inner wall 5a, convex portions 3c are provided so as to be spaced apart in the axial direction.

Conventionally, the waterproof plug 3 having the above-mentioned configuration is molded by the mold shown in FIG. The molding die includes a first die A provided with a pin 8 for forming the wire insertion hole 3a, a second die B that operates in close proximity to the first die A, and a waterproof plug 3 And a third mold C having a mold surface for molding the outer peripheral surface of. The first mold A and the second mold B are arranged facing each other as shown in the figure, and the third mold C is fixedly arranged between the first mold A and the second mold B. The first mold A and the second mold B are moved closer to the third mold C to form the waterproof plug 3.

That is, the pin 8 of the first mold A is inserted into the through-hole-shaped mold surface 9 of the third mold C, and the mold surface 10 A of the first mold A and the mold surface 10 of the second mold B are inserted. The mold surface 10B is brought into contact with both side end surfaces of the third mold C to form a waterproof plug molding cavity, and the cavity is filled with rubber for molding. 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]

[Problems to be solved by the device]

 Since the molding die for the waterproof plug has the above-mentioned configuration, if the electric wire is an ultrafine wire with a diameter of 1 mm or less, the diameter of the pin 8 will also be 1 mm or less, and even in that case, a length of 5 to 6 mm is required. Has an extremely elongated shape.

Moreover, since the recess 8a is formed in order to form the sealing projection 8b on the pin 8 having the small diameter, the diameter of the recess 8a is further reduced, and the pin 8 is in a state of being easily broken.

As described above, since the pin 8 has an extremely small diameter and is long, the pin 8 has low strength and is easily damaged by the pressure applied during molding. Further, when the pin 8 is pulled out after molding, it is filled in the concave portion 8 and protruded, but the convex portion 3b of the waterproof plug is caught, which also causes a problem that the pin 8 is easily bent or damaged.

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

[0010]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is designed to insert a terminal press-fitted wire into an electric wire insertion hole provided along an axis and to make an outer peripheral surface closely contact with an inner wall of a connector to waterproof a terminal storage chamber of the connector. As a molding die for a tubular rubber waterproof plug, a pair of dies that are arranged facing each other and are operated in close proximity are provided with pins for forming the wire insertion holes, respectively. A connector waterproof plug characterized in that when the tips of the pins are butted, the sum of the lengths of the pins that are abutted against each other and are continuous correspond to the entire length of the wire insertion hole. To provide the molding die of.

In addition to forming a sealing projection on the inner peripheral surface of the wire insertion hole of the waterproof plug to be molded by providing annular recesses on the outer peripheral surface of each pin of the molding die at intervals in the axial direction, The tip abutting surface of each pin is set to a portion other than the recessed portion, and the lengths of both side pins are set to a length at which the pressure applied at the time of molding is substantially evenly applied.

Since the molding die has the above-described structure, one pin that has been conventionally provided to project from one die is divided into two parts and is shortened, so that it is provided to project from both sides of the die. The strength of the pin can be increased, and the damage and deformation of the pin, which was likely to occur during molding, can be prevented.

[0013]

【Example】

 Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. As shown in FIG. 1, the molding die includes a first die A and a second die B which are arranged to face each other, and a third die which is arranged between these first die A and the second die B. It consists of type C and. The third mold C is fixed and has a through hole having a mold surface 9 forming the outer peripheral surface of the waterproof plug 3, as in the above-described conventional example.

The first die A and the second die B, which are arranged on both sides of the third die C and are moved toward and away from each other, respectively abut on both end surfaces 10c, 10c of the third die C. Pins 12 and 13 project from the mold surfaces 10A and 10B so as to face each other on the same axis.

The sum of the length L3 of the pin 12 and the length L4 of the pin 13 is set to match the length L2 of the wire insertion hole 3a of the waterproof plug 3 to be molded. (L3 + L4 = L2) As described above, the conventional wire insertion hole forming pin is divided into two, but the length distribution is determined by the forming pressure applied to the pins 12 and 13 during forming. The positions are set to be approximately even.

On the outer peripheral surfaces of the pins 12 and 13, concave portions 12a, 13a having a substantially V-shaped cross section are formed in an annular shape, and a sealing convex portion 3b protruding on the inner peripheral surface of the wire insertion hole 3a is formed. I have to. The above-mentioned recess is not formed at the tips of the pins 12 and 13 so that no recess is formed at the tip joint surface at the position where the tip abutting surfaces 12b and 13b are brought into close contact with each other. There is. This is to prevent burrs from being formed in the sealing projection 3b of the waterproof plug to be molded.

The process of molding the waterproof plug with the molding die of the present invention is as shown in FIGS. 1 to 3, and the first die A and the second die on both sides of the fixed third die C are used. The mold B is moved close to each other, and as shown in FIG. 2, the cavity formed by these molds A, B, and C is filled with rubber to form the waterproof plug 3. After molding the waterproof plug 3, as shown in FIG. 3, the first mold A and the second mold B on both sides are retracted so that the electric wire insertion hole 3a of the molded waterproof plug 3 allows the pins 12, 13 to be retracted. Each pull out.

When the pins 12 and 13 are pulled out as described above, the pins 12 and 13 are easily pulled out due to their short length, and the number of the protrusions 3 b for sealing, which serve as pull-out resistance of the pins 12 and 13, are reduced. Therefore, it becomes easy to pull out the pin. In addition, it is possible to prevent the deformation and damage of the pin that occurred when the pin was pulled out.

[0019]

[Effect of the device]

 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 the length of the two divided pins is, of course, natural. As a result, the pins can be made stronger than before with the same diameter. Moreover, one end of each of these divided pins is supported by a die, and conventionally, one long long pin is supported in a cantilever manner, whereas it is divided into two pins each. Since it is supported and is supported at two points on both sides, the support strength of the pin can be greatly increased.

As described above, since the strength of the pin itself is increased and its supporting strength is increased to enable stable support, for example, the diameter of each pin is 1 mm or less, and the sum of the lengths of these pins is 5 mm. Even in a waterproof plug molding die for ultra-thin wires of about 6 mm, it is possible to effectively reduce or prevent pin deformation and damage.

[Brief description of drawings]

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

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

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

4 is a perspective view of FIG. 3. FIG.

FIG. 5 is a partial cross-sectional view of a terminal crimp electric wire with a waterproof plug attached.

6 is a cross-sectional view showing a state in which 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]

 1 terminal 2 wire 3 waterproof plug 3a wire insertion hole 3b, 3c convex portion for sealing A 1st mold B 2nd mold C 3rd mold 8 pins 12,13 pins 12a, 13a recess 12b, 13b tip abutting surface

Claims (2)

[Scope of utility model registration request] 1. A substantially tubular rubber waterproof plug for inserting a terminal crimping wire into an electric wire insertion hole provided along an axis and for bringing an outer peripheral surface into close contact with an inner wall of a connector to waterproof a terminal accommodating chamber of the connector. A pair of molding dies, which are arranged opposite to each other and are operated in proximity, are provided with pins for forming the wire insertion holes, respectively, and the tips of the pins are butted when the dies are brought close to each other. At the same time, the mold for molding the connector waterproof plug is characterized in that the sum of the lengths of the pins on both sides where the ends are abutted to each other is set to correspond to the total length of the wire insertion hole. 2. The annular recesses are provided on the outer peripheral surface of each of the pins at intervals in the axial direction, and the tip abutting surface of each of the pins is set to a portion other than the recess, and the lengths of both side pins are set. The mold for a waterproof plug according to claim 1, wherein the pressure applied at the time of molding is set to a length at which the pressure is substantially evenly applied.