JPH0336054Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to a lamp socket.

[Background technology]

FIGS. 5 and 6 show lighting equipment to which a conventional example is applied. That is, this lighting fixture includes a fixture main body 30 and a pair of lamp sockets 3 that are attached to the fixture main body 30 with screws 31 and arranged opposite to each other.
2, 33, and a lamp 36 having bases 34, 35 at both ends. In the lamp sockets 32 and 33, an insulator 38 disposed in a metal cylinder 39 having a guide notch 40 is urged toward the opening 39a by a spring 37, and the stopper piece 3 at the tip of the opening 39a is pressed.
It is a plunger type that is locked to the insulator 38, and a contact is provided on the front surface of the insulator 38. These lamp sockets 32 and 33 are arranged at an interval shorter than the entire length of the lamp 36, and as shown in FIG. The cap 34 is brought into contact with the contact point of the other lamp socket 33, and the insulator 38 is pushed in by the action of the spring 37 on the lamp socket 32 side, so that it is in the installed state.

However, these lamp sockets 32, 33
Since the metal cylinder 39 and the front surface of the insulator 38 having the contact point are almost in alignment, the cap 34 may be mistakenly placed in the middle of attaching or detaching the lamp 36 and come into contact with the stopper piece 39b as shown in FIG. 5, which is not in the correct position. There were cases where power was supplied while the equipment was stopped and there was a risk of a ground fault. Furthermore, since the insulator 38 is usually made of ceramic, it is difficult to achieve dimensional accuracy and a gap is provided between it and the inner diameter of the metal cylinder 39. However, as shown in FIG.
If the insulator 38 is inserted diagonally, the insulator 38 will be twisted and get caught in the metal tube 39, stopping halfway, making installation difficult.

[Purpose of invention]

The object of this invention is to provide a lamp socket which can prevent the occurrence of the above-mentioned ground fault accident and also prevents the insulator from becoming easily distorted even if the lamp is inserted obliquely.

[Disclosure of invention]

This invention has a cylindrical shape with an opening at one end, and guide notches are formed at the edges of one opposing part of the opening, and a pair of stoppers are formed between the guide notches at the edge of the opening. A metal cylinder with one piece facing inward, a pair of side walls arranged in the metal cylinder with a contact point in the center of the front face facing the opening, and a pair of side walls that slide into contact with the inner surface of the metal cylinder, with the tips of the side walls facing inwards. A guide groove is formed on the outer surface of the side wall so as to protrude beyond the opening on both sides of the contact point on the front surface so as to communicate between the side walls with the guide notch, and in which the stopper piece slides. an insulator, and a spring disposed inside the metal cylinder to bias the insulator in the direction of the opening of the metal cylinder and to lock the stopper piece to the inner end of the groove. It is something that

According to this invention, since the tips of the pair of side walls protrude beyond the metal cylinder, there is no risk of the lamp cap getting caught in a halfway position and causing a ground fault.

Also, since the side wall slides inside the metal cylinder, it acts as a guide for the insulator, making it easy to insert the lamp without twisting. It can also be applied to metal halide lamps, etc. whose side walls generate a high pulse voltage when starting.
Moreover, it can provide a safe and compact socket.

Embodiment An embodiment of this invention will be explained based on FIGS. 1 to 3. That is, this lamp socket has a cylindrical shape with an opening 1 at one end, and guide notches 2 are formed at the edges of one opposing portion of the opening 1, and the guide notches 2 are formed at the edges of the opening 1. A metal cylinder 4 has a pair of stopper pieces 3 facing inward between the notches 2, and a contact point 6 is provided at the center of a front surface 5 disposed inside the metal cylinder 4 facing the opening 1. A pair of side walls 7 which are in sliding contact with the inner surface of the front surface 5 are provided on both sides of the contact point 6 of the front surface 5 so that the tips 7a of the side walls 7 protrude beyond the opening 1, and the guide notch is formed between the side walls 7. an insulator 10 formed on the outer surface of the side wall 7 as a guide groove 8 communicating with the stopper piece 3 and a groove 9 on which the stopper piece 3 slides; A spring 12 is provided which urges the stopper piece 3 in the direction of the opening 1 of the tube 4 and locks the stopper piece 3 to the inner end 11 of the groove 9.

A pair of tongue pieces 1 are attached to the rear end of the metal tube 4 from its edge.
3, overlapping the mounting plate 14 on the tongue piece 13, and caulking the cylindrical part 16 for attaching the mounting plate 14 to the instrument body into the hole 15 of the tongue piece 14. The ends are closed.
A lead wire insertion hole 17 is formed in the center of the mounting plate 14 . The stopper piece 3 is formed by cutting and bending. The insulator 7 has a spring receiving narrow cylindrical part 18 formed on the rear side, and the spring 1 is a coil spring.
The two end portions are fitted together and supported on the stepped portion 19. The opposite end of this spring 12 is supported by a mounting plate 14.

The contacts 6 are embedded in the front surface 5 of the insulator 10.

That is, the conductor 20 holding the contact 6 is provided through the insulator 10, and the lead insertion hole 1 is formed in the conductor 20.
A lead wire 21 passing through 7 is connected. Furthermore, a taper 22 is formed at the corner edge on the guide notch 2 side at the bottom of the guide groove 8 on the front surface 5 of the insulator 10.

With this structure, by setting the height of the side wall 7 forming the guide groove 8 to an appropriate pressure, this lamp socket prevents the lamp cap from getting caught in a halfway position, thereby preventing ground faults. . That is, the height of the side wall 7 is calculated by dividing H ₁ into the height of the side wall 7 and H ₂
If is the socket spacing and H ₃ is the stroke of the insulator 10, it is preferable to set it to H ₁ H ₃ -(lamp length - H ₂ ). Furthermore, by making the outer surface of the side wall 7 slide into contact with the inner surface of the metal tube 4, it serves as a guide for the insulator 10, preventing the insulator 10 from tilting, and making it possible to easily insert the lamp without twisting as in the conventional case. Furthermore, the side wall 7 can be applied to metal halide lamps that generate a high pulse voltage at the time of starting, and a safe and compact socket can be provided.
Furthermore, since the side wall 7 is located inside the metal cylinder 4, the side wall 7
It is possible to prevent selfishness. Also taper 22
This serves as a guide when inserting the lamp opening 23 along the guide groove 7.

24 is a covering tube that covers the connection portion between the conductor 20 and the lead wire 21.

In addition, as a modification, the stopper piece 3 may be formed in the opening 1 of the metal tube 4 as shown in FIG. In this case, the taper 22 plays an important role as a guide for the base 23 and can prevent it from getting caught in a halfway position.

[Effect of idea]

According to this invention, since the tips of the pair of side walls protrude beyond the metal cylinder, there is no risk of the lamp cap getting caught in a halfway position and causing a ground fault.

Also, since the side wall slides inside the metal cylinder, it acts as a guide for the insulator, making it easy to insert the lamp without twisting. It can also be applied to metal halide lamps, etc. whose side walls generate a high pulse voltage when starting, and has the effect of providing a safe and compact socket.

[Brief explanation of drawings]

Figure 1 is a half-sectional view of an embodiment of this invention, Figure 2 is a half-sectional view of an embodiment of this invention.
The figure is a perspective view, Figure 3 is a perspective view of the insulator, Figure 4 is a perspective view of the insulator, and Figure 4 is a perspective view of the insulator.
FIG. 5 is a perspective view of a modified example, FIG. 5 is a plan view showing a state in which a lamp is incorrectly inserted into a lighting fixture to which a conventional lamp socket is applied, and FIG. 6 is a partial sectional view showing another state in which a lamp is incorrectly inserted. DESCRIPTION OF SYMBOLS 1...Opening part, 2...Guide notch, 3...Stopper piece, 4...Metal tube, 5...Front surface, 6...Contact point, 7...Side wall, 7a...Tip, 8...Guide groove, 9...Groove, 10...
Insulator, 11...inner end, 12...spring.

Claims (1)

[Claims for Utility Model Registration] (1) It is cylindrical with an opening at one end, and guide notches are formed at the edge of one opposing part of the opening, and the guide notch is formed at the edge of the opening. A metal cylinder with a pair of stopper pieces facing inward between the notches, and a pair of side walls that are arranged inside the metal cylinder and have a contact point at the center of the front face facing the opening, and that are in sliding contact with the inner surface of the metal cylinder. protruding from both sides of the contact on the front surface so that the tips of the side walls protrude beyond the opening, and forming a guide groove communicating between the side walls with the guide notch, and a groove in which the stopper piece slides. an insulator formed on the outer surface of the side wall; and an insulator disposed inside the metal tube to bias the insulator toward the opening of the metal tube and to engage the stopper piece at the inner end of the groove. A lamp socket with a spring for stopping. (2) The lamp socket according to claim 1, wherein a corner edge facing the guide notch at the bottom of the guide groove is tapered.