JPS6214629Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a socket for a downlight.

Figure 1 shows the installation status of a typical recessed incandescent light fixture, where A is the downlight socket, B
is the appliance body, C is the ceiling, and D is the power line. As is clear from such a configuration, the heat generated when the light bulb E shown by the broken line is turned on is concentrated in the upper part of the appliance body B, and the downlight socket A
It is known that the temperature of the socket A for downlights becomes considerably high due to the heat generated due to the contact resistance between the socket and base of the light bulb E. FIG. 2 shows a conventional downlight socket. In the figure, 1 is a socket body, a cylindrical part 11 in which a lamp holder 2 to which a light bulb is attached is arranged,
Container part 1 that houses a quick-connect terminal device for wiring connections
It is equipped with 2. The cover portion 12 is placed directly above the cylindrical portion 11, and the lamp holder 2 and the terminal device are electrically connected through the partition wall. Reference numeral 13 denotes a flange provided on the outer periphery of the cylindrical portion 11. Using this flange 13, for example, the socket body 1 can be attached to the instrument body B as shown in FIG.
Install. The lamp holder 2 is composed of a cylindrical holder 21 with a bottom as shown in FIG. 3, and a central tongue (not shown) disposed at the center of the bottom. A notch 211 is formed at the bottom of the receiver 21, in which the central tongue piece is generally arranged in combination, and the socket body 1
A pair of fixing screw holes 212, 2 for fixing to
12. A connection screw hole 213 is provided for fixing a conductor for electrical connection with a terminal device for wiring connection. With such a configuration, the temperature of the receiver increases considerably due to heat generated by the light bulb, heat generated by the receiver itself due to contact resistance between the bulb base and the receiver, and the like. This varies depending on the wattage of the light bulb, the shape of the appliance itself, installation conditions, etc., but in general there is a temperature rise of 100 to 120 degrees. This temperature is conducted to the terminal device through the aforementioned conductor, and as a result increases the temperature of the wiring wire by about 25 to 30 degrees. By the way, since vinyl-coated wires are generally used for power wiring, it is necessary to consider the heat resistance of the wires, and if there is a temperature rise as mentioned above, there is a risk that the limit will be exceeded, for example 60 degrees Celsius. be. For this reason,
It is an important issue in downlight sockets of this type to keep the temperature conducted to the terminal device as low as possible.

In view of the above-mentioned problems, in order to reduce the transfer of heat from the receiver to the terminal device, the present invention specifically forms the connection part of the receiver to which the conductor is fixed in a band shape,
This restricts the conduction of heat through it.
The band-shaped connecting portion is formed by cutting out both sides of the receiver, and both ends of the band-shaped connecting portion are integrally connected to the receiver. This allows the connection to be made considerably thinner without compromising its strength.
Heat conduction to the conductor side also decreases accordingly.
This will be explained below using the drawings.

4, 5, and 6 show embodiments of the present invention, and the same parts as in FIGS. 2 and 3 are designated by the same reference numerals. That is, the socket body 1 accommodates a cylindrical portion 11 in which a lamp holder 2 to which a light bulb is attached is arranged, and a quick-connect terminal device 3 for wiring connection that is electrically connected to the lamp holder 2.
A cap portion 12 is provided on the outer peripheral side of the cylindrical portion 11. A stepped flange 15 is provided at the periphery of the opening of the cylindrical portion 11, and a locking portion 16 for attachment to the instrument body is provided on the side wall of the flange 15. Further, a heat radiation hole 17 is formed in the flat part of the flange part 15. The lamp holder 2 is a cylindrical holder 2 with a bottom.
1 and a central tongue piece 22 at the center of the bottom thereof, both of which are electrically and mechanically connected to a pair of conductors 4, 4 through an insulating wall 111 corresponding to the top plate of the cylindrical portion 11. The conductors 4, 4 are connected to a recessed part 12 formed on the outer circumferential side of the cylindrical part 11 with a partition wall 18 interposed therebetween.
are introduced through the partition wall 18 and connected to a pair of terminal plates 31, 31 constituting the terminal device 3, respectively. Each terminal plate 31 has a locking spring 32.
A pair of electric wire insertion holes 14 are provided facing each other, and each of the electric wire insertion holes 14 is disposed facing the electric wire insertion opening 14 formed in the cover portion 12. Although not shown, an insulating wall 11 is provided to ensure mutual insulation between the conductors 4 and 4.
Of course, a rising piece for separation may be provided at 1. Reference numeral 19 denotes a lid body that covers the socket body 1 after the terminal device 3, conductor 4, etc. are disposed therein. On the other hand, in the received money 21, the received money 21
A connecting portion is formed to which the conductor 4 connecting the terminal device 3 and the terminal device 3 is fixed. This connection part of the receiver 21 is a band-shaped part, and a connection screw hole 213 for connecting the conductor 4 is provided therein. A pair of notches 214, 21 are provided on both sides of this connection part in the receiver 21.
4 will be provided. These notches 214, 214 are formed by cutting out the corners of the receiver 21 that span the bottom and the cylindrical portion into a substantially fan shape. The uncut portion in between becomes a band-like and bridge-like connection portion including a connection screw hole 213. One end of the connecting portion is integrally connected to the cylindrical portion of the receiver 21 . Also,
The other end is integrally connected to a portion of the receiver 21 near the center of the bottom. The part near the center of the bottom is the part around the notch 211.

In this way, the band-shaped connecting portion is integrally connected to the receiver 21 at both ends thereof. Therefore, the connecting portion can be made thinner as shown in the figure without sacrificing its strength, thereby limiting heat conduction through itself.
Furthermore, heat conduction from this direction is also restricted by the notches 214 on both sides of the connection part. Therefore, heat conduction from the receiver 21 to the connection portion of the conductor 4 is greatly restricted, and according to experiments by the inventors, the temperature rise decreases by about 15 degrees. This temperature drop of just over 10% naturally leads to a decrease in heat conduction to the terminal device 3, resulting in a 5 to 8 deg reduction in temperature rise in the terminal device 3, thus keeping the temperature within the allowable temperature limit of the electric wire. be able to. In addition, since the box part 12 that houses the terminal device 3 is placed on the outer circumferential side of the cylindrical part 11, far away from the center line of the cylindrical part 11, the air warmed by the heat generated by lighting the light bulb is The entire bottom part 12 is heated,
As a result, the conventional disadvantage of increasing temperature rise is eliminated, and the temperature rise can be reduced.

FIG. 7 shows another embodiment of the present invention, in which the wire insertion port 14 is connected to the cylindrical portion 11 of the socket body 1.
It is placed facing towards the center of the screen. The configuration of other parts is basically the same as the previous embodiment. That is, the conductor 4, which is connected to the receiver 21 and the central tongue piece 22 through the insulating wall 111, respectively.
4 are connected to the terminal plates 31 and 31 through the partition wall 18, respectively. Locking springs 32, 32 are arranged facing each other on the terminal plates 31, 31, respectively, and these are arranged facing the wire insertion openings 14, 14. In the conductor 4 used in this example, a notch 41 is formed in the middle of the band-shaped portion to reduce its cross-sectional area, and a resistance region for heat conduction is formed within a range that does not cause problems in electrical connection. ing. Notch 4
1 may specifically form a portion with a small cross-sectional area on the conductor 4, and its shape is not particularly specified. According to such a configuration, in addition to the effect of the notch 214 of the receiver 21, there is an effect of limiting heat conduction to the terminal device 3.

In the embodiment, a quick connection type terminal device is shown, but it goes without saying that other screw-tightening type terminal devices can be used with the same effect.

As explained in detail above, the downlight socket according to the present invention limits heat conduction through the conductor from the lamp holder to the terminal device.
The connection part of the receiver to which the conductor is fixed is a band-shaped piece sandwiched between a pair of notches, and both ends of the belt are formed so as to be integrally connected to the receiver. According to this, since it is possible to make the strip-shaped connection part particularly thin, heat conduction from the holder to the terminal device is greatly restricted, and it is difficult to dissipate heat such as in downlight lighting equipment, making it difficult to dissipate heat. This has the effect of keeping the temperature of the terminal device low even in devices where the temperature rise of the metal fittings is large.

It should be noted that the band-shaped connecting portion connects with the receiver on both sides thereof and serves to prevent undesired deformation of the cylindrical portion of the receiver, so that the present invention can be implemented without difficulty.

[Brief explanation of the drawing]

Figure 1 is a side view showing the installed state of a downlight lighting fixture, Figure 2 is a partially cutaway side view showing a conventional downlight socket, Figure 3 is a perspective view of its receiver, and Figure 4 is a main body. A sectional view of the embodiment according to the invention, FIG. 5 is a top view with the lid removed, FIG. 6 is a perspective view of the receiver, and FIG. 7 is another embodiment with the lid removed. FIG. In the figure, 1 is the socket body, 11 is the cylindrical part,
12 is a part, 21 is a receiver, 213 is a screw hole for connection,
214 is a notch, 3 is a terminal device, 4 is a conductor, 41
is a notch.

Claims (1)

[Claims for Utility Model Registration] 1. A lamp holder consisting of a substantially cylindrical holder with a bottom and a central tongue piece placed at the center of the bottom, and a wiring connection electrically connected to the lamp holder. In a socket for a downlight, which includes a terminal device and a socket body in which a cylinder part for arranging a lamp holder and a recess part for housing the terminal device are connected, a conductor connecting the holder and the terminal device is fixed. A pair of notches are formed on both sides of the connection part in the receiver so that the connection part of the receiver has a band shape, and one end of the connection part exhibiting the band shape is integrally connected to the cylindrical part of the receiver, and A socket for a downlight, characterized in that the other end of the connecting part is integrally connected to a part of the holder near the center of the bottom. 2. The socket for a downlight according to claim 1 of the utility model registration, characterized in that a notch is formed in the middle of the conductor connecting the receiver and the terminal device to reduce its cross-sectional area. 3. The downlight socket according to claim 1, which is characterized by comprising a socket body including a cylindrical portion and a recess portion disposed on the outer circumferential side of the cylindrical portion.