JPH0542631Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a socket that is suitable for use when light bulbs are used in environments where there is a lot of vibration and metal corrosion is likely to occur, such as at construction sites. It is related to.

[Prior Art] Conventional light bulb sockets are broadly classified into screw-type and insertion-type sockets.

Most sockets for general incandescent light bulbs used in homes are screw-in type, and a roughly cylindrical light bulb cap with threads is screwed onto the inner surface of the side wall of the socket, which has a roughly U-shaped cross section. A spiral groove is formed for The side walls and bottom of the socket are provided with conductive parts that are insulated from each other, and by screwing the cap into the socket, the side of the cap, the side wall of the socket, and the tip of the cap (the side and (insulated) and the bottom of the socket are electrically conductive. That is, since both ends of the filament placed inside the glass bulb are connected to the side surface and tip of the cap via copper wires, it is possible to conduct electricity to the filament by screwing the cap into the socket.

On the other hand, a plug-in type socket has a roughly U-shaped cross-sectional socket with a predetermined engagement recess, and a roughly cylindrical base with a predetermined engagement protrusion is fitted into the socket, making use of spring force. It provides electrical continuity at a predetermined location, and compared to the screw-in type, 1) it can be installed with just one click. 2) Even if vibration is applied, conductivity is unlikely to occur. There are advantages such as

[Problem that the invention aims to solve] By the way, light bulbs are not only used in relatively good indoor environments, but they are also exposed to frequent vibrations, such as at construction sites, and are exposed to pollutants and pollutants scattered in the atmosphere. It is also used in environments where metal corrosion is likely to progress due to the influence of weather.

Among the conventional sockets mentioned above, screw-in type sockets tend to loosen due to frequent vibrations, resulting in poor continuity and must be retightened each time. There was a problem.

In addition, although plug-in sockets have relatively good vibration resistance, they use spring force to achieve continuity, so if the spring is damaged due to corrosion etc., it becomes completely insulated. However, there was a problem in that it could not be reused unless parts were replaced.

[Means for Solving the Problems] In this invention, a spiral groove having a substantially U-shaped cross section with an opening at one end and a predetermined pitch is formed on the inner surface of the side wall. In a socket (a so-called screw-in type socket) having a first conductive part and a second conductive part insulated from the first conductive part on a bottom surface facing the opening, the second conductive part The part is inserted into a non-circular through hole bored approximately at the center of the bottom surface so as to be able to move forward and backward, has a cross-sectional shape that cannot be rotated within the through hole, and has a through hole at the end on the opening side. The terminal bar has a conductive flange integrally shaped so as not to be pulled out from the hole, and the flange has a hollow, substantially conical shape opened toward the opening, and has a conical shape on its inner wall. By having a conductive convex portion integrally formed along a direction substantially coinciding with the generatrix, and further by interposing an elastic body between the collar portion of the terminal bar and the bottom surface, The above problems are achieved.

[Function] Although the socket according to this invention is a screw-in type socket, an elastic body is interposed between the collar of the terminal rod inserted into the through hole in the bottom of the socket and the bottom, so that the socket cannot be screwed together. Appropriate contact pressure is applied between the bulb cap and the side wall of the socket, and between the tip of the cap and the collar of the terminal rod. For this reason, even when vibrations are applied, the socket and bulb cap are unlikely to loosen, and even if the cap moves slightly toward the socket opening, the terminal bar is pushed forward by the elastic body, ensuring good conductivity. is maintained.

In addition, even if the elastic body deteriorates during long-term use outdoors, making it impossible to obtain the desired elasticity or even breaking, the socket according to the present invention has a structure that can be screwed into the base of the light bulb. Therefore, it can be used as a normal screw-in socket.

Furthermore, if the shape of the flange of the terminal rod in the present invention is a hollow conical shape with an opening at the bottom, and a convex portion formed on the inner wall in a direction that substantially coincides with the generatrix of the cone, a light bulb can be obtained. Each time the cap is screwed into the socket, the tip of the cap is polished by the convex portion, thereby maintaining better electrical continuity.

In addition, as the elastic body in the present invention, a coil spring made of wire metal wound into a coil is preferably used, but since such an elastic body is not directly involved in conduction, it does not necessarily have to be metal. Depending on the situation, polymeric materials exhibiting rubber-like elasticity may also be used.

[Embodiment] FIGS. 1 and 2 are a sectional view and a perspective view showing an example of a socket according to the present invention.

The socket 1 of this embodiment is entirely made of brass and has a substantially U-shaped cross-section with an opening 2 at one end. A spiral groove 3a into which the base of the light bulb is screwed is formed at a predetermined pitch on the inner surface of the side wall 3 of the socket (whole constitutes the first conductive part), and the opening 2 The bottom surface 4 facing the is insulating plates 8a and 8b made of Bakelite or the like.
It is held between. There is a hole approximately at the center of the bottom surface 4 and the insulating plates 8a and 8b (hole diameter of the bottom surface>hole diameter of the insulating plate).
are provided, and by fitting the eyelets 7a into the holes of the insulating plates 8a, 8b, the insulating plates 8a, 8b are closed.
b is fixed and a rectangular through hole 7 is formed. As mentioned above, the hole in the bottom surface 4 is connected to the insulating plate 8.
Since it is larger than the holes a and 8b, the eyelet 7a and the bottom surface 4 (ie, the side wall 3) are insulated in this state.

A terminal bar 5 (constituting the second conductive part) also made of brass is inserted into the through hole 7 into which the eyelet 7a is fitted so as to be movable forward and backward and to penetrate through the bottom surface 4. An electrically conductive flange 5a having a funnel-like conical shape and opened toward the opening 5 is integrally provided at the end on the opening 2 side. A conductive convex portion 5c is integrally provided in a direction substantially coinciding with the generatrix of the socket 1 to prevent the terminal bar 5 from coming out in the direction of the bottom surface of the socket 1. The size of the flange 5a is set to match the tip of the base of the light bulb to which it is attached. In addition, the cross section of the terminal bar 5 is approximately square with a diagonal line larger than the short side of the through hole 7.
The terminal bar 5 is prevented from rotating within the through hole 7 when the base of the light bulb is screwed into the socket 1.

Since this terminal bar 5 is pushed in the direction of the bottom surface 4 when the base of the light bulb is screwed (described later), the end on the bottom surface 4 side does not necessarily need to be processed into a shape that cannot pass through the through hole 7. However, in this embodiment, the end portion on the bottom surface 4 side is processed into a plate shape having a width wider than the hole diameter of the through hole 7, and a terminal portion 5b is provided. Lead wires etc. connected to the power source are soldered to the terminal portion 5b, but as mentioned above, the terminal bar 5 is designed not to rotate within the through hole 7, so when installing the light bulb, the terminal portion 5b is soldered. 5
The lead wire soldered to b will not be twisted.

Further, a spring 6 (having a size such that it does not come off from the flange 5a), which is made of a brass wire wound into a coil, is interposed as an elastic member between the flange 5a and the bottom surface 4 of the terminal bar 5. . As this elastic member,
Depending on the size of the socket and the environment in which the light bulb is used, instead of a metal spring, a ring-shaped polymer material such as butyl rubber or silicone rubber may be used.

To manufacture the socket as described above, first, the main body of the socket 1, the terminal bar 5, the spring 6, and the eyelet 7a are each pressed into a predetermined shape. On this occasion,
The terminal portion 5b of the terminal bar 5 is not formed so that the terminal bar 5 can be inserted into the through hole 7.

Insulating plates 8a and 8b are made by cutting a Bakelite plate or the like into a disk shape having approximately the same size as the bottom surface 4 of the main body of the socket 1, and a circular hole is bored approximately in the center thereof. Then, sandwich the bottom surface 4 of the socket 1 body from both sides with insulating plates 8a and 8b, and insert the rectangular eyelet 7a.
are fitted into the holes of the insulating plates 8a and 8b to form a rectangular through hole 7. Thereafter, the terminal rod 5 encircled with the spring 6 is inserted, and the end portion protruding outside the bottom surface 4 is crushed into a plate shape to prevent it from coming out of the through hole 7, thereby obtaining the socket 1 of this embodiment.

Next, FIG. 3 is a sectional view showing a state in which a light bulb 9 is attached to the socket 1 shown in FIGS. 1 and 2.

The light bulb 9 includes a substantially cylindrical glass bulb 15 and a cap 10.
The outer surface of the cap 10 is formed with threads of a predetermined pitch. Further, inside the glass bulb 15, a filament 14 connected between the copper wires 13a and 13b is disposed, and one of the copper wires 13a
is soldered to the side of the base 10, and the other copper wire 1
3b is soldered to the tip 12 of the base 10. Note that the side surface of the cap 10 and the tip portion 12 are insulated by an insulating portion 11.

The base 10 of such a light bulb 9 is shown in FIGS. 1 and 2.
When screwed into the socket 1 explained in the figure, the base 10
The flange 5a of the terminal bar 5 is pushed by the tip 12 of the terminal bar 5 (the terminal bar 5 does not rotate at this time), the spring 6 is compressed, and a force is exerted on the tip 12 to push it back.

This makes the conduction between the tip 12 of the cap 10 and the terminal bar 5 (second conductive part) and the side surface of the cap 10 and the side wall of the socket (first conductive part) more reliable, even when vibrations are applied. Current can be passed through the filament reliably. Further, even if the spring 6 is damaged during long-term use, the above-mentioned conductive path can be maintained by further screwing the base 10. Further, each time the cap 10 is screwed into the socket 1, the tip 12 of the cap 10 (i.e., the filament The soldered portion of the copper wire connected to one end) is polished, and it is possible to prevent poor conductivity due to deterioration of the surface condition of the solder.

In the above embodiments, the entire socket is made of metal, but the entire side wall of the socket does not necessarily have to be conductive; instead, the socket body may be made of plastic and a portion of the side wall may be conductive. It goes without saying that a structure with sections may also be used.

[Effects of the invention] The socket according to this invention has a screw-in structure and is interposed with an elastic member to apply appropriate contact pressure to the conductive connection, so it is less susceptible to vibrations. This has the excellent effect of preventing the screw connection between the bulb cap and the socket from loosening.

In addition, even if the elastic member deteriorates or breaks during long-term use, it will not become an insulator like a conventional plug-in socket.
It can be used as a screw-in socket without replacing any parts.

Furthermore, the shape of the flange of the conductive terminal rod is made into a substantially funnel-like conical shape that opens toward the opening of the socket, and a convex portion is formed on the inner wall in a direction that substantially coincides with the generatrix of the cone. As a result, the soldered tip of the socket of the light bulb is polished, and poor conductivity due to deterioration of the surface condition of the solder can be prevented.

If such a socket is used, it will be possible to maintain good performance without having to retighten screws or replace parts, even under poor conditions such as at a construction site, where it is directly affected by the weather and subject to constant vibration. This has the effect of allowing the bulb to be used continuously in this condition.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a perspective view showing an embodiment of the invention, and Fig. 3 shows a light bulb attached to the socket of the embodiment shown in Figs. 1 and 2. FIG. Explanation of symbols of main parts, 1...socket, 2...
Opening, 3... Side wall, 4... Bottom, 5... Terminal bar, 5a... Flange, 5c... Convex portion, 6... Spring,
9...Light bulb, 10...Base.

Claims (1)

[Claims for Utility Model Registration] A spiral groove having a substantially U-shaped cross section with an opening at one end is formed in a side wall surface at a predetermined pitch, and a first conductive portion is formed in at least a portion of the side wall. and a second conductive part insulated from the conductive part of the first part is provided on the bottom face facing the opening, the second conductive part being provided at approximately the center of the bottom face. A conductive conductive plate is inserted into the non-circular through-hole so as to be movable back and forth, has a cross-sectional shape that cannot rotate within the through-hole, and has a shape that does not allow it to come out of the through-hole at the end on the opening side. A terminal bar having a flange integrally formed therein, the flange having a substantially funnel-like conical shape opened toward the opening, and integrally formed on the inner wall in a direction substantially coinciding with the generatrix of the cone. What is claimed is: 1. A socket having an electrically conductive convex portion, further comprising an elastic body interposed between the collar portion of the terminal bar and the bottom surface.