JPH10261313A - Waterproof socket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a lamp screwed into a waterproof socket from loosening owing to the presence of a watertight cover while ensuring sufficient water proofing. SOLUTION: A waterproof socket comprises a socket body 1 that has at its one end an opening 1a in which a lamp base 5a is inserted and has therein a hub 2 for receiving the base 5a, and a waterproof cover 3 of soft elastic material that has at its one end a lamp insertion bore 3a facing the opening 1a and is adapted to be closely fitted on the outer periphery of the socket body 1 on the side of the opening 1a. The bore 3a, into which a lamp 5 is inserted, is adapted to closely fit at its circumferential edge on the outer periphery of the lamp 5. The cover 3 is formed at the other end with a cut 3b, which serves to make the moment M2 of the frictional force between the cover 3 and the socket body 1 smaller than the moment M3 of the frictional force against force between the base 5a and the hub 2 to loosen the lamp 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a waterproof socket.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional waterproof socket. This waterproof socket comprises a socket body 1, a receiver 2 and a waterproof cover 3.

The socket body 1 has a bottomed cylindrical shape having an opening 1a on one side, and is provided with legs 1b projecting from both sides from the bottom side thereof so as to form a substantially inverted T-shape. Have been. In addition, the socket body 1 accommodates a socket 2 which is formed in a substantially cylindrical shape and is formed by threading on a peripheral side surface, and a leaf spring-shaped central contact piece 4 is attached to the bottom side. When the lamp base 5a of the lamp 5 is screwed into the receiving metal 2 from the side of the opening 1a, the central contact 5b of the lamp 5 comes into contact with the central contact piece 4.

The waterproof cover 3 is formed in a substantially cylindrical shape with a step made of a soft elastic body, and is fitted on the outer periphery of the opening 1a side of the socket body 1 on its large diameter side. The waterproof cover 3 has a small-diameter side, which is a lamp insertion hole 3a into which the lamp 5 can be inserted, facing the opening 1a of the socket body 1.

In the thus constructed waterproof socket, when the lamp 5 is inserted from the lamp insertion hole 3a and the lamp base 5a is screwed into the socket 2 inside the socket body 1, the waterproof cover 3 has one side. The peripheral end of the lamp insertion hole 3a comes into close contact with the outer peripheral surface of the bulb 5c of the lamp 5, so that the inside of the socket body 1, which is inside the waterproof cover 3, is prevented from being flooded.

[0006]

However, in the waterproof socket shown in the above-mentioned conventional example, the waterproof cover 3 is not provided.
However, the lamp 5 is closely contacted with the socket body 1 and the bulb 5c of the lamp 5 at the peripheral end of the lamp insertion hole 3a, and the frictional force between them is large. 3 is twisted. The torsion may remain on the waterproof cover 3 even after the lamp 5 is mounted, and the force of the torsion acts on the lamp 5 to loosen the center contact 5b of the lamp 5 from the center contact piece 4 and the socket body. There is a possibility that the mounting of the lamp 5 on 1 may not be completed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a waterproof socket in which a lamp is prevented from being loosened by a waterproof cover while ensuring waterproofness. is there.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to the first aspect of the present invention, in which one side has an opening into which a screw-type lamp base is inserted, and the inside thereof has a lamp. A socket body accommodating a socket which contacts the base, and a soft elastic body which is fitted in close contact with the outer periphery of the opening side of the socket body and which has a lamp insertion hole on one side facing the opening. A waterproof cover comprising a waterproof cover, wherein the lamp is inserted from the lamp insertion hole, and a peripheral end of the lamp insertion hole is brought into close contact with an outer peripheral surface of the lamp. At least one of a moment due to frictional force and a moment due to frictional force between the waterproof cover and the lamp,
The present invention is characterized in that the moment between the lamp base and the receiver is caused by a frictional force opposing a force in a direction in which the lamp is loosened.

According to the second aspect of the present invention, the first aspect is provided.
In the waterproof socket described above, the moment due to the frictional force between the waterproof cover and the socket body is smaller than the moment due to the frictional force opposing the force between the lamp base and the receiver in the direction in which the lamp is loosened. It is characterized by being made smaller.

[0010] According to the third aspect of the present invention, the second aspect is provided.
In the waterproof socket described above, a cutout is provided at the other end of the waterproof cover.

According to the fourth aspect of the present invention, there is provided a second aspect.
In the waterproof socket described above, a concave portion that forms a gap between the waterproof cover and the socket main body is provided at a part of the contact surface side of the waterproof cover with the socket main body.

[0012]

FIG. 1 shows a first embodiment of a waterproof socket according to the present invention.
It comprises a socket body 1, a receiver 2 and a waterproof cover 3.

The socket body 1 has a bottomed cylindrical shape having an opening 1a on one side, and is provided with legs 1b protruding from both sides from the bottom side surface, so as to form a substantially inverted T-shape. Have been. In addition, the socket body 1 accommodates a socket 2 which is formed in a substantially cylindrical shape and is formed by threading on a peripheral side surface, and a leaf spring-shaped central contact piece 4 is attached to the bottom side. , The receiving member 2 and the center contact piece 4 are connected by soldering to a lead wire 6 passed through the leg portion 1b of the socket body 1 from the side thereof. When the lamp base 5 a of the lamp 5 is screwed into the receiving metal 2 from the opening 1 a side of the socket body 1, the central contact 5
b is in contact with the central contact piece 4.

The waterproof cover 3 is formed in a stepped, substantially cylindrical shape made of a soft elastic body, and has a notch 3b at its large diameter end. The waterproof cover 3 has its large-diameter side fitted and fitted on the outer periphery of the opening 1a side of the socket body 1, and one small-diameter side faces the opening 1a of the socket main body 1 so that the lamp 5 can be inserted therein. Lamp insertion hole 3a. When the lamp 5 is inserted from the lamp insertion hole 3a and the lamp base 5a is screwed into the socket 2 inside the socket body 1, the inner diameter of the lamp insertion hole 3a becomes the lamp insertion hole 3a on one side of the waterproof cover 3. Has a diameter such that it is close to the outer peripheral surface of the bulb 5 c of the lamp 5, and is dimensioned so as not to be flooded inside the socket body 1 inside the waterproof cover 3.

Here, when the lamp 5 is mounted on the waterproof socket, the moment due to the frictional force between the bulb 5c generated in the direction opposite to the screwing direction of the lamp 5 and the peripheral end of the lamp insertion hole 3a of the waterproof cover 3 is determined. M1, the moment due to the frictional force between the outer peripheral surface of the socket body 1 and the inner surface on the large diameter side of the waterproof cover 3 is M2. Then, at least one of these moments M1 and M2 is opposed to a force in a direction in which the lamp 5 is loosened when the mounting of the lamp 5 is completed by providing the notch 3b in the waterproof cover 3. It is configured to be smaller than a moment M3 due to a frictional force generated between the receiver 2 and the lamp base 5a.

That is, when the lamp 5 is mounted on the waterproof socket, a force such that the waterproof cover 3 is twisted with the rotation of the lamp 5 is applied, and the bulb 5c and the peripheral end of the lamp insertion hole 3a of the waterproof cover 3 are connected. Moment M1 due to frictional force between the outer peripheral surface of the socket body 1 and the waterproof cover 3
And a moment M2 due to a frictional force with respect to the large-diameter side inner surface occurs in the direction in which the lamp 5 is loosened. Of these moments, the magnitude of the moment M2 depends on the torsion of the waterproof cover 3 before reaching the magnitude of the moment M3 due to the frictional force opposing the force in the direction in which the lamp 5 is loosened when the lamp 5 is completely mounted. As the force gathers in the notch 3b, the contact surface between the socket body 1 and the waterproof cover 3 moves,
The value does not exceed the moment M3. As a result, the twist of the waterproof cover 3 is reduced, and as a result, the moment M2 due to the frictional force between the outer peripheral surface of the socket body 1 and the large-diameter inner surface of the waterproof cover 3 acting in the direction in which the lamp 5 is loosened is reduced. It is not enough to loosen 5.

In the waterproof socket configured as described above, when the lamp 5 is inserted from the lamp insertion hole 3a and screwed, the lamp 5 is mounted on the waterproof socket, and the inside of the socket body 1 inside the waterproof cover 3 is covered by the waterproof cover 3. The waterproofness is ensured by preventing the water from being flooded.

As described above, in the waterproof socket according to the present embodiment, when the lamp 5 is mounted on the waterproof socket, the bulb 5c generated in the direction opposite to the screwing direction of the lamp 5 and the periphery of the lamp insertion hole 3a of the waterproof cover 3 are provided. The moment M2, which is at least one of the moment M1 due to the frictional force between the ends and the moment M2 due to the frictional force between the outer peripheral surface of the socket main body 1 and the inner surface on the large-diameter side of the waterproof cover 3, Is provided with a notch 3b, which is smaller than a moment M3 due to a frictional force generated between the receiver 2 and the lamp base 5a against a force in a direction in which the lamp 5 is loosened when the mounting of the lamp 5 is completed. When the lamp 5 is screwed into the socket body 1, the waterproof cover 3 is hardly twisted when the lamp 5 is screwed into the socket body 1. The loosening of the lamp 5 can be prevented by the water cover 3. Further, since the notch 3b is provided at the other end of the waterproof cover 3 on the large diameter side, the waterproof cover 3 can be easily covered on the socket body 1 from the other side.

FIG. 2 shows a second embodiment of the waterproof socket of the present invention. The difference from the first embodiment is that the socket body 1 of the waterproof cover 3 is replaced with the notch 3b. Near the peripheral end of the opening 1a of the contact surface of the waterproof cover 3
Is provided with a concave portion 3c that forms a gap between the socket body 1 and the outer peripheral surface over the entire circumference in the circumferential direction. The other configuration is substantially the same as that of the first embodiment.

Even with such a configuration, substantially the same effect as that of the first embodiment is obtained except that the waterproof cover 3 is easily put on the socket body 1 from the other side, and the concave portion 3c is The waterproof cover 3 is not visible from the outside, and there is no need to provide a cutout exposed on the outer surface of the waterproof cover 3, so that the appearance of the waterproof cover 3 does not deteriorate.

In the present embodiment, the concave portion 3c
To the opening 1 on the contact surface of the waterproof cover 3 with the socket body 1.
Although the one provided around the entire circumference in the circumferential direction of the waterproof cover 3 near the peripheral end is illustrated, the present invention is not limited to this, and the concave portion is provided partially in the circumferential direction of the waterproof cover. Of course, the position of the recess may be provided at any position on the contact surface of the waterproof cover with the socket body, and the shape of the recess may be provided in parallel with the axial direction of the waterproof cover. May be obtained.

In the waterproof socket according to each of the above embodiments, the moment M of the moments M1 and M2
2 is smaller than the moment M3,
The present invention is not limited to this, and when mounting the lamp in the waterproof socket, the moment M1 due to the frictional force between the bulb generated in the direction opposite to the screwing direction of the lamp and the peripheral end of the lamp insertion hole of the waterproof cover is determined. Moment M due to frictional force opposing the force in the direction to loosen the lamp in the completed mounting state
It may be smaller than 3 to reduce the twist of the waterproof cover.

Further, in the waterproof socket in each of the above-described embodiments, the receiving base 2 is formed such that the substantially cylindrical inner surface is threaded and the lamp base 5a is screwed in. However, the present invention is not limited to this. A screw-in waterproof socket may be provided in which a screw screwed to the lamp base is provided on the inner peripheral side surface of the socket body, and a leaf spring-shaped receiving member is provided on the inner peripheral side surface.

[0024]

As described above, according to the present invention, the moment caused by the frictional force between the waterproof cover and the socket body can be reduced.
At least one of the moment due to the frictional force between the waterproof cover and the lamp is smaller than the moment due to the frictional force opposing the force in the direction of loosening the lamp between the lamp base and the receiving base. When the screw is screwed in, the torsion hardly remains in the waterproof cover, and the moment acting in the direction of loosening the lamp does not reach the size of loosening the lamp. Therefore, the waterproof cover can be prevented from being loosened by the waterproof cover while ensuring waterproofness.

According to the third aspect of the present invention, the second aspect is provided.
In addition to the effects of the described invention, since the notch is provided at the other end of the waterproof cover, the waterproof cover can be easily covered on the socket body from the other side.

In the invention according to claim 4, claim 2
In addition to the effects of the described invention, since a concave portion that forms a gap between the waterproof cover and the socket main body is provided in a part of the contact surface side of the waterproof cover with the socket main body, the concave portion can be seen from the outside of the waterproof cover. And the appearance of the waterproof cover does not deteriorate.

[Brief description of the drawings]

FIGS. 1A and 1B show a first embodiment of a waterproof socket of the present invention, in which FIG. 1A is a partial cross-sectional front view, and FIG. 1B is a schematic view showing the direction of each moment.

FIG. 2 is a partially sectional front view showing a second embodiment of the waterproof socket of the present invention.

FIG. 3 is a partial sectional front view showing a conventional waterproof socket.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Socket main body 1a Opening 2 Receipt 3 Waterproof cover 3a Lamp insertion hole 3b Notch 3c Recess 5 Lamp 5a Lamp base

Claims (4)

[Claims] 1. A socket body having an opening into which a screw-type lamp base is inserted, and a socket body accommodating therein a receiving base for abutting the lamp base, and externally fittingly attached to an outer periphery of the opening side of the socket body. A waterproof cover made of a soft elastic body provided with a lamp insertion hole on one side opposite to the opening, wherein the lamp is inserted from the lamp insertion hole, and a peripheral end of the lamp insertion hole is In a waterproof socket closely contacted with the outer peripheral surface of the waterproof cover, at least one of a moment due to a frictional force between the waterproof cover and the socket body, and a moment due to a frictional force between the waterproof cover and the lamp, A waterproof socket, characterized in that the moment between the lamp base and the receiver is reduced by a frictional force against a force in a direction in which the lamp is loosened. 2. A moment due to a frictional force between the waterproof cover and the socket body is smaller than a moment due to a frictional force opposing a force between the lamp base and the receiver in a direction in which the lamp is loosened. The waterproof socket according to claim 1, wherein: 3. The waterproof socket according to claim 2, wherein a cutout is provided at the other end of the waterproof cover. 4. The waterproof socket according to claim 2, wherein a recess is formed in a part of the waterproof cover on a contact surface side with the socket body to form a gap between the waterproof cover and the socket body. .