JPH05217648A - Method and structure of sealing bulb socket - Google Patents

Abstract

(57) [Abstract] [Purpose] A sealing method suitable for quick, easy and automation by improving the seal at the drawing-out portion of the harness 7 connected to the terminal 6 housed in the valve socket, and the seal. Provide structure. [Structure] A molding die 9 is positioned under the cylindrical opening 5a of the socket so as to face each other, and a heat-softening powder resin 11 is put into the molding die 9 and heated and melted by a heater 10. , Cool and solidify.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a sealing structure for sealing a part of a harness connected to a terminal housed in a valve socket, which is pulled out from a cylindrical opening of the valve socket. Is.

[0002]

2. Description of the Related Art FIG. 4 is an external front view showing an example of a wedge valve used in a vehicular lamp, and FIG. 5 is a sectional view showing a state in which the wedge valve is mounted in a socket and electrically connected to a harness. Is. The wedge bulb 1 shown in FIG. 4 has a wedge base 1 on a part of the glass bulb 1a.
b is molded. This wedge base is also called a pinch part. A main filament 2 and a sub-filament 3 are provided in the glass bulb 1a,
Lead wires 4 of these filaments are drawn out through the wedge base 1b. The lead wire 4 drawn out of the glass bulb 1a is the wedge base 1
It is folded back in a U shape so as to be in close contact with the wide surface of b.
Reference numeral 5 shown in FIG. 5 (A) is a socket body made of synthetic resin, in which a terminal 6'is housed. This terminal 6'contacts and conducts with the above-mentioned lead wire 4, and
It is soldered and connected to the harness 7. The harness 7 is pulled out from the cylindrical opening 5a of the socket body 5 and connected to a switch or a power source (not shown). A grommet 8 is attached so that rainwater, car wash water, splashed water, dust, etc., do not enter the lamp through the cylindrical opening 5a. An example of this grommet 8 is shown in FIG.
The grommet 8 of this conventional example is a thick disk-shaped rubber member and is provided with a plurality of through holes 8a for inserting a harness. As shown in FIG. 5 (A), the harness 7 is inserted into the through hole 8 a of the grommet 8 and the grommet 8
Is fitted into the cylindrical opening 5a of the socket body.

[0003]

In order to completely waterproof the cylindrical opening 5a, the diameter of the through hole 8a of the grommet 8 is set smaller than that of the harness 7, and a proper tightening margin is given. Be done. Therefore, it takes a lot of time and labor to insert the harness 7 into the through hole 8 and the workability is not good. In addition, the work of fitting the grommet 8 into the cylindrical opening 5a while sliding the harness 7 in the through hole 8a must rely on manual work, which makes automation difficult. The present invention has been made in view of the above circumstances, and facilitates the location where the harness connected to the terminal housed in the valve socket is pulled out from the tubular opening of the valve socket. It is an object of the present invention to provide a seal structure capable of surely sealing a seal, and a method provided for automation for constructing the seal structure.

[0004]

The basic technical idea of the present invention created in order to achieve the above-mentioned object is that the above-mentioned molding is carried out in the state where the above-mentioned cylindrical opening is exposed to a molding die. The mold is used to mold the seal member. In order to apply the above principle to an actual lamp, the bulb socket sealing method of the present invention is such that the harness connected to the terminal housed in the bulb socket is pulled out from the tubular opening of the bulb socket. In the method of sealing a portion, the cylindrical opening is covered with a molding die, and a powdery or fine granular thermosoftening synthetic resin is put in the molding die, and the molding die is heated to heat the It is characterized in that the softening synthetic resin is melted, cooled, and cured to form a synthetic resin seal cap covering the cylindrical opening.

As a structure suitable for applying the above-mentioned method of the invention, the seal structure of the valve socket of the present invention is such that the harness connected to the terminal housed in the valve socket has a cylindrical shape. In the method for sealing a portion drawn out from the opening, a seal cap made of a thermosoftening synthetic resin is provided which covers the cylindrical opening and penetrates the harness.

[0006]

According to the above-mentioned means, the sealing member made of synthetic resin for covering the cylindrical opening of the valve socket is formed in a so-called actual shape, so that the sealing member is completely attached to the socket body and the harness. Adheres closely and obtains excellent sealability. The mold should be provided with a through hole for inserting the harness, but this part does not require a tightening margin,
It suffices that the synthetic resin material for molding does not leak out, and the harness can be easily inserted. Also, FIG.
Since it is not necessary to fit the separately formed grommet into the cylindrical opening of the socket body as in the conventional example described above, it is suitable for automating the work. A known synthetic resin molding technique can be applied to the molding of the sealing member with the synthetic resin material using a molding die.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The upper half of FIG. 2 shows a state in which a wedge valve 1 is attached to a socket body 5, and a harness 7 which has not yet been waterproofed extends downward. A conical cup 9 having a through hole 9b that fits in the harness 7 described above.
A molding die member 9 made of a is formed. Reference numeral 9c is a supporting arm. The conical cup 9a is intended to have a conical inner surface, and the outer peripheral shape may be arbitrarily configured. The conical cup 9a of this embodiment is made of a metal material so as to improve heat transfer. The harness 7 is inserted into the through hole 9b of the molding die 9, the harness 7 is slid on the inner peripheral surface of the through hole 9b, and the molding die 9 is brought close to the socket body 5 as shown by an arrow a. The cylindrical opening 5a is gently covered. As described above, the cylindrical opening 5a is formed by the molding die 9.
Is gently covered, and the cylindrical opening is opposed to and separated from the inner surface of the molding die 9. Then, the heater 10 is arranged so as to surround the molding die 9.

With the preparation as described above, the mold 9
Then, the heat-softening powder resin 11 is put therein. In the present invention, the heat softening property includes the heat melting property. The amount of the heat-softening powder resin to be put in the molding die is appropriate to cover the bottom surface of the conical cup 9a when it is in a fluidized state and sufficiently cover the cylindrical opening 5a. .. The mold 10 is heated by the heater 10. As a result, the heat-softening powder resin 11 in the molding die 9 is heated and melted to form a cap-shaped seal member that covers the cylindrical opening 5a of the socket body 5. When this is cooled and solidified, a seal cap 12 as shown in FIG. 3 (A) is formed, and the harness 7 penetrates the seal cap 12 in an airtight and watertight manner, and the seal cap 12 is the socket body 5 The cylindrical opening 5a is covered airtightly and watertightly. FIG. 3B is a cross-sectional view of the socket body 5 and the vicinity of the seal cap 12. The cylindrical opening 5a of the socket body 5 is completely sealed by the seal cap 12, and the socket body 5 is mounted on the lamp housing (not shown) of the vehicular lamp via the ring packing 13.

[0009]

As described above, when the method of the present invention is applied to implement the seal structure of the present invention, it is not necessary to insert a thick harness into a small through hole of a grommet which is separately formed. It is possible to form a seal member having a good sealing property and is suitable for automating the work of molding the seal member in the assembled state.

[Brief description of drawings]

FIG. 1 is a method 1 of sealing a valve socket according to the present invention.
It is sectional drawing for demonstrating an Example.

FIG. 2 is a first method of sealing a valve socket according to the present invention.
It is a perspective view for explaining an example.

3A and 3B are a perspective view and a cross-sectional view showing a sealing structure of a valve socket constructed according to the above embodiment.

FIG. 4 is an external view of a wedge valve supported by a valve socket to which the present invention is applied.

5A and 5B show a valve socket to which the present invention is applied, where FIG. 5A is a sectional view and FIG. 5B is a perspective view of a grommet.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Wedge bulb, 1a ... Glass bulb, 1b ... Wedge base (also called a pinch part), 2 ... Main filament, 3 ... Sub filament, 4 ... Lead wire, 5 ... Socket body, 5a ... Cylindrical opening, 6, 6 '... Terminal, 7 ... Harness, 8 ... Grommet, 8a ... Through hole, 9 ... Mold (molding die), 9a ... Cone cup, 9b ... Through hole, 9c ... Support arm, 10 ... Heater, 11 ... Thermosoftening powder resin, 12
... Seal cap, 13 ... Ring packing.

Claims (2)

[Claims] 1. A method for sealing a portion of a harness connected to a terminal housed in a valve socket, which is pulled out from the cylindrical opening of the valve socket, wherein the cylindrical opening is formed. The mold is covered with a powdery or fine granular thermosoftening synthetic resin, the mold is heated to melt the thermosoftening synthetic resin, and the mixture is cooled and cured to form the tubular shape. A method for sealing a valve socket, comprising molding a synthetic resin seal cap covering an opening. 2. A structure in which a harness connected to a terminal housed in a valve socket seals a portion drawn out from the tubular opening of the valve socket, covering the tubular opening, and A seal structure for a valve socket, characterized in that a seal cap made of a thermosoftening synthetic resin, which penetrates the harness, is provided.