JPH0135413Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention covers the base end of the plug main body that accommodates the movable terminal (spring terminal), and covers the connection part of the connection cord connected to the plug main body, and also serves as a body. The present invention relates to an improvement in a power plug whose knob portion is formed by molding a synthetic resin material.

As shown in FIG. 1, the above-mentioned power plug usually has an outer sleeve 1 made of a metal material, with both front and rear (left and right in FIG. 1) ends and the inner cavity made of a hard synthetic resin material. The molded body 2 is integrally formed by insert molding, and the molded body 2 has a shaft center portion,
A shaft hole 3 into which a connecting pin P on the jack side (Fig. 3) is fitted is formed so as to pass through it in the axial direction of the outer cylinder sleeve 1 in the front and back directions (left and right in Fig. 1), and a movable terminal (spring terminal ) 4 (Fig. 3) is formed into a butterfly shape extending upward and downward from the center of the shaft hole 3, and the fitting groove 5 is formed on the rear end side. The movable terminal 4 is formed into a plate shape by punching a springy metal plate from the rear end side of the fitting groove 5 (the right end side in Fig. 1) is left open to the outside.
are fitted into the fitting groove 5 and the rear half of the shaft hole 3 as shown in FIG. After the core wires 60, 60 of the connection cord 6 are connected by soldering, a knob portion 7 made of a soft synthetic resin material is molded on the outer periphery of the connection portion, as shown in FIG. I am trying to assemble it.

In the power plug A assembled in this way, a knob part 7 that becomes the body is molded with a soft synthetic resin material around the outer periphery of the connection area between the rear end of the plug main body part a and the connection cord 6 connected thereto. When molding, the synthetic resin material is applied to the inner circumferential surface 3a of the shaft hole 3 and the left and right side surfaces 4a, 4 of the movable terminal 4 made of a metal plate.
The movement of the movable terminal pieces 40, 40 of the movable terminal 4 fitted into the fitting groove 5 is deteriorated due to leakage into the inner cavity of the plug main body part a from the gaps d, d formed between the two. In addition, when the connecting pin P on the jack side is inserted from the open opening on the front end side of the shaft hole 3, the insertion is obstructed, resulting in poor conduction with the jack side. This includes the aforementioned gap 30,
30 could be filled with another filler, but doing so would increase the number of assembly steps and production costs.

The purpose of this invention is to solve the problem of the synthetic resin material leaking into the inner cavity of the plug main body during molding, without increasing the number of assembly steps, and by fitting it into the plug main body. To effectively solve problems by holding a movable terminal in a stable state relative to a plug main body during connection work of a connection cord.

Next, a power plug according to the present invention for achieving this purpose will be described in detail with reference to drawings of embodiments. Note that the same reference numerals as in the above-mentioned conventional means are used for the same constituent members.

As shown in FIGS. 6 and 7, the power plug A has its main body portion a inserted into a molded body 2 made of a hard synthetic resin material that is integrally insert-molded with an outer sleeve 1, and its axial center portion A shaft hole 3 is formed in the shaft hole 3 into which the connection pin P on the jack side is fitted, and fitting grooves 5 for fitting the movable terminal 4 from behind are formed integrally with the shaft hole 3 above and below the shaft hole 3. A movable terminal 4 punched from a resilient metal plate is inserted into the fitting groove 5 and the rear half of the shaft hole 3 from behind as shown in FIG. The core wires 60, 60 of the connecting cord 6 are connected to the rear ends of the outer sleeve 1 and the movable terminal 4 of the main body part a, and molded with a soft synthetic resin material as shown in FIG. The process of forming the knob part 7 and assembling it into the power plug A is the same as the previous power plug A, but the fitting groove 5 and The movable terminal 4 to be inserted into the rear half of the shaft hole 3 has the above-mentioned gaps d and d in the portion of the molded body 2 corresponding to the shaft hole 3, as shown in FIG. 14 when viewed from the rear. A plurality of claw pieces 41 having a shape that follows the cross-sectional shape are extruded from the metal plate forming the movable terminal 4 toward the left and right sides (top and bottom in FIGS. 13 and 14), respectively, as shown in FIG. 11. The movable terminal 4 is connected to the fitting groove 5 of the molded body 2 and the rear half of the shaft hole 3 by a plurality of claw pieces 41 arranged in parallel in the axial direction of the shaft hole 3 and pushed out toward the left and right sides respectively. When the plug main body part a is configured by being inserted into the side, the left and right sides 4a, 4a of the movable terminal 4
The gaps d and d formed between the left and right inner circumferential surfaces 3a and 3a of the shaft hole 3 are closed as shown in FIG. 9, and the knob portion 7 that becomes the body is molded with a soft synthetic resin material. This is designed to prevent the synthetic resin material from leaking into the inner cavity of the plug main body part a when the plug is inserted.

In this means of the present invention, the claw pieces 41 formed on the movable terminal 4 by extrusion from a metal plate that is the material of the movable terminal 4 are arranged in the above-mentioned gaps d and d when viewed from the rear.
The movable terminal 4 may be formed by cutting out a metal plate, which is the material of the movable terminal 4, as shown in FIG. 15. Further, when the shaft hole 3 formed in the molded body 2 is formed in a rectangular shape when viewed from the rear as shown in FIG. 16, it is rectangular when viewed from the rear as shown in FIGS. 17 to 19. , and
When the shaft hole 3 is formed in a rectangular shape rotated by 45 degrees with respect to the fitting groove 5 when viewed from the rear as shown in FIG. 20, it is formed into a triangular shape when viewed from the rear as shown in FIGS. 21 to 23. It is formed into a shape that matches the cross-sectional shape of the gaps d and d, which vary based on the difference in the cross-sectional shape of the shaft hole 3.
In addition, the above-mentioned claw pieces 41 formed by cutting or extruding have outer circumferential edges in a rear view of the left and right inner circumferential surfaces 3a of the shaft hole 3 in FIG.
Although it is shown to be separated from 3a, this is for the sake of explanation, and in reality they are formed in close contact with each other.

Next, to explain the function and effect, as mentioned above, the power plug A according to the present invention has a movable terminal 4 that is fitted into the fitting groove 5 provided in the molded body 2 made of synthetic resin material of the main body part a of the plug. In a rear view, side surfaces 4a, 4a of the movable terminal 4 and inner peripheral surface 3 of the shaft hole 3 are attached to a portion of the molded body 2 corresponding to the shaft hole 3.
A plurality of claw pieces 41, 41 each having a shape that fills the left and right gaps d, d formed between the movable terminal 4 and the movable terminal 4 are cut out or extruded from the metal plate forming the movable terminal 4 toward both left and right sides. Since they are arranged in parallel in the axial direction of the shaft hole 3, when the knob portion 7 is molded with a synthetic resin material, the side surfaces 4a, 4a of the movable terminal 4
The synthetic resin material leaks into the inner cavity of the plug main body a through the gaps d and d formed between the left and right inner peripheral surfaces 3a and 3a of the shaft hole 3, and the movable terminal 4
Since the plug can be dammed by the claw pieces 41 cut and pushed out from the plug body, problems caused by leakage of the synthetic resin material toward the lumen side of the plug main body part a can be eliminated. Thus, the claw pieces 41 for preventing leakage of the synthetic resin material can be formed together when the movable terminal 4 is punched out from a metal plate, and can be formed together with the movable terminal 4 when the movable terminal 4 is fitted into the fitting groove 5. By inserting the power plug A, the gaps d and d described above are closed, so that manufacturing and assembling the power plug A is not complicated. Moreover,
The claw pieces 41 are closely attached to the inner peripheral surface of the shaft hole 3 and fit into the fitting groove 5.
Since the movable terminal 4 inserted into the plug main body part a side is attached to the main body part a side of the plug, the core wire 60 of the connection cord 6,
To facilitate the work of connecting 60... by soldering.

[Brief explanation of drawings]

Figure 1 shows the main body of a conventional power plug.
FIG. 2 is a rear view of the same as above, FIG. 3 is a longitudinal side view of the main body of the same plug with the movable terminal inserted, and FIG. 4 is a side view of the same as above before the movable terminal is inserted. 5 is a longitudinal sectional side view of the same power plug in a molded state; FIG. 6 is a longitudinal sectional side view of the plug main body of the power plug according to the present invention in a state before the movable terminal is inserted; Figure 7 is a rear view of the same as the above, Figure 8 is a vertical cross-sectional side view of the main body of the plug with the movable terminal inserted, Figure 9 is a rear view of the same as the above, and Figure 10 is the molding of the power plug according to the present invention. FIG. 11 is a side view of the movable terminal of the above power plug, FIG. 12 is a perspective view of the main parts of the above movable terminal,
Fig. 13 is a cross-sectional plan view of the movable terminal as above, Fig. 14 is a rear view of the movable terminal as above, Fig. 15 is a perspective view of the main part of the movable terminal of another embodiment, and Fig. 16 is another embodiment. FIG. 17 is a side view of the movable terminal in the above embodiment, FIG. 18 is a cross-sectional plan view of the same movable terminal, FIG. 19 is a rear view of the same movable terminal, and FIG. 20 is a further FIG. 21 is a side view of the movable terminal in the embodiment, FIG. 22 is a cross-sectional plan view of the movable terminal, and FIG. 23 is a rear view of the movable terminal in the same embodiment. Explanation of drawing symbols, A...Power plug, a...Plug main body, 1...Outer cylinder sleeve, 2...Molded body, 3...Shaft hole, 3a...Inner peripheral surface, 4...Movable terminal ( Spring terminal), 4a... Side face, 40... Movable terminal piece, 41... Claw piece, 5... Fitting groove, 6... Connection cord, 60... Core wire, 7... Knob part, d...
...Gap, P... Connection pin.

Claims (1)

[Scope of utility model registration request] A molded body 2 made of a synthetic resin material is integrally insert-molded on both the front and rear ends and the inner cavity side of an outer cylinder sleeve 1 made of a metal material, and the molded body 2 has a jack-side part at its axial center. A shaft hole 3 into which a connecting pin is fitted is formed by penetrating it back and forth, and a fitting groove 5 into which a movable terminal 4 is fitted is formed on both upper and lower sides of the shaft hole 3 so as to be continuous with the shaft hole 3 on the rear end side. is formed into a shape that opens rearward, and a movable terminal 4 made of a springy metal plate is fitted into the fitting groove 5 of the plug main body part a, and the outer cylindrical sleeve of the plug main body part a In the power plug A, the core wires 60, 60 of the connection cord 6 are connected to the movable terminal 4 and the movable terminal 4, respectively, and a knob portion 7 made of a synthetic resin material is molded around the connecting portion. are attached to the side surface 4a of the movable terminal 4 at a portion corresponding to the shaft hole 3 of the molded body 2 when viewed from the rear.
A plurality of claw pieces 41, 41 are shaped to fill the left and right gaps d, d formed between the inner peripheral surfaces 3a, 3a of the shaft hole 3, respectively, from the metal plate forming the movable terminal 4. A power plug characterized in that the plugs are cut and bent or extruded toward both sides of the shaft hole 3 and are arranged in parallel in the axial direction of the shaft hole 3.