JPS6121817Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement of a socket for a plug-in indicator light with a rod-like outer shape used in, for example, telephone exchanges.

Indicator lights used in telephone exchanges and the like have a structure as shown in FIGS. 1 to 3. That is, this indicator light 1 has a light bulb part 2 having a filament (not shown) inside, an insulating base 3 coupled to this, and a length extending over both the light bulb part 2 and the insulating base 3. The overall shape is rod-like, with plate-like caps 4 provided on opposite sides of the outer periphery. This indicator light 1 has two bases 4.
By applying a voltage between them, the light bulb section 2 emits light.

Conventionally, as a socket for receiving the indicator lamp 1 having such a structure, a socket having a structure as shown in FIGS. 4 and 5 has been used. That is, 5 is a socket, and a cylindrical part 6 made of an insulating material.
It consists of a bottom part 7, a base part 7, and a contact piece 8 which is held by inserting the base part between them and has its tip brought close to the base 4 of the indicator lamp 1 so as to be in contact with the base part 4. A hole 9 is provided in the bottom part 7 to receive the base of the indicator light 1.

The tip of the contact piece 8 has a bent part 10 bent outward.
, so that the indicator light 1 can be easily inserted. This contact piece 8 is made of an elastic material, and a force is applied to the contact piece 8 in a direction to bring it close to each other so that it comes into contact with the base 4 of the indicator lamp 1 with an appropriate pressure. Reference numeral 11 in FIG. 4 is a hole provided in the cylindrical portion 6, and is used to caulk a portion of the contact piece 8 into a recess 12 provided in the bottom portion 7.

The conventional socket 5 having such a structure has the following drawbacks. That is, as shown in FIGS. 1 and 2, the base of the indicator light 1 (the part of the insulating base 3) is pointed in the orientation shown in FIG. 1, but when it is rotated 90 degrees. Since the contact piece 8 has a flat shape, when it is inserted into the socket 5 in the attitude shown in Fig. 1, the contact piece 8 must be pushed open in the direction of arrow A.
When inserting the contact piece 8 in the position shown in the figure,
The contact pieces 8 are brought into contact with each other by narrowing in the direction of
There is a risk of a short circuit accident.

This invention was made in view of this point, and a stopper is provided to prevent both contact pieces from coming into contact with each other, so that even if an attempt is made to insert the indicator light 1 into the socket 5 in the wrong orientation, the contact piece 8 will end up on the inside. It is designed so that it will not bend and short circuit accidents will not occur.

Next, an embodiment of this invention will be explained with reference to FIGS. 6 and 7. In this case, the socket 13 also has a cylindrical portion 14 and a bottom portion 15 made of an insulating material. The point that the base of the contact piece 16 is gripped by the contact piece 15 is basically the same as the conventional one shown in FIGS. 4 and 5. The fixing structure of the contact piece 16 is slightly different, but this part will be described later.

As shown in FIG. 8, the contact piece 16 has an ear portion 17 whose tip is wider than the other portion. The tip of the ear portion 17 is formed into a bent portion 18 that opens outward, and a curved surface 1
It's turning 9. This curved surface 19 is for making it easier to guide the insulating base 3 at the base of the indicator light 1.

The two contact pieces 16 are connected to the cylindrical portion 14 as described above.
and the bottom part 15, but in order to make it even stronger, a part of it is cut and raised to form a tongue piece 20 (see FIGS. 8 and 9), and this tongue piece 20 is held by the bottom part 15. It is engaged with a recess 21 provided in the. To actually assemble, attach the tongue piece 20 to the eighth
As shown in the figure, the contact piece 16 is made flat like the other parts, and the contact piece 16 is inserted into the cylindrical part 1 from the left side of FIG.
4 and the bottom portion 15, the tongue piece 20 is bent using a tool through the hole 22 provided in the cylindrical portion 14, and is engaged with the recess 21. Note that the recess 21
A slope 23 is formed in a part of the contact piece 1.
I am trying to make my grip on 6 firmer.

As shown in FIGS. 6 and 7, the two contact pieces 16 are shaped so that they approach each other toward the tips (left end in the figure). Nearby, a stopper 24 is provided on the inside of the two opposing contact pieces 16, and a stopper 25 is provided on the outside.
is provided. The inner stopper 24 is the seventh
As shown in the figure, the contact piece 16 has a shape that protrudes opposite to the inside of the ear part 17, and the contact piece 16 contacts this with the ear part 17, and even if an external force is applied, the contact piece 16 will not move further inside. It is made so that it does not bend. The outer stoppers 25 also face the ears 17 of the contact piece 16, and are adapted to press the ears 17 from both sides when the contact piece 16 is opened.

Both the inner and outer stoppers 24 and 25 are integrally molded with the bottom portion 15 and the cylindrical portion 14, and protrude from the bottom portion 15. The center portion of this protruding portion 26 is formed as the inner stopper 24, and the outer tip is formed as the outer stopper 25. The protrusion 26 is provided with a contact piece insertion groove 27, into which the contact piece 16 is inserted. The opposing surface of the inner stopper 24 is formed into a curved surface 28 that conforms to the outer shape of the indicator light 1.

When this socket 13 configured in this manner is inserted from the left side in FIG.
6 is pushed open, and the contact piece 16 is mounted between the contact piece 16 and the stopper 24 facing inside. If the equal contact piece 16 that tilts the indicator lamp 1 during insertion is opened too much, the ear portion 17 of the contact piece 16 will come into contact with the outer stopper 25, so that the elasticity of the contact piece 16 will not be impaired.

When inserting the indicator light 1, if the orientation of the indicator light 1 is incorrectly displaced by 90 degrees, the insulating base 3 of the indicator light 1 acts to bend the contact piece 16 inward, but this movement Since this is prevented by the ear portion 17 coming into contact with the inner stopper 24, there is no short-circuit accident as in the conventional case.

Since this device is configured as described above, it has the following advantages:

If you try to insert the indicator in the wrong position,
Therefore, the contact pieces are not bent inward, and therefore there is no risk of short circuiting as occurs in conventional contacts.

Since it is also possible to prevent the contact piece from being pushed outward excessively when inserting the indicator light, the elasticity of the contact piece can be maintained within a certain range, and the contact piece can be held correctly.

Even if the contact piece has variations within the range of dimensional accuracy during manufacture and its own elasticity is uneven, by applying an initial load that causes the tip to contact the inner stopper, it will remain approximately constant. contact pressure can be obtained.

Since the tips of both contact pieces are configured to abut against the inner stopper, it is possible to obtain an indicator light socket in which the insulation distance between both contact pieces is constant.

Since the tips of both contact pieces have ears that are wider than the other parts and protrude outward, the stoppers formed on the inside and outside of both contact pieces can be brought into contact with the ears that protrude outward. A stopper can be easily provided so as not to interfere with the insertion of the indicator light.

[Brief explanation of the drawing]

Figure 1 is a side view of the indicator light, Figure 2 is a plan view of the one in Figure 1, Figure 3 is a front view of the one in Figure 1 seen from the left, and Figure 4 is a longitudinal section of the conventional socket. 5 is a sectional view taken along the line V-V in FIG. 4, FIG. 6 is a vertical sectional view of an embodiment of this invention, FIG. 7 is a cross-sectional view taken from FIG. It shows a
is a side view, b is a side view thereof, and FIG. 9 is a direction arrow view showing a part of FIG. 6. 1: Indicator light, 2: Bulb section, 3: Insulation base,
4: Base, 13: Socket, 14: Cylindrical part, 1
5: Bottom, 16: Contact piece, 17: Ear, 18: Bent part, 24, 25: Stopper.

Claims (1)

[Scope of utility model registration request] An indicator light that has a rod-like outer shape and has two contact pieces arranged close together so that when the indicator light is inserted, the tip contacts the cap from the outside. In this socket, an ear portion protruding outward that is wider than the other portions is formed at the tips of both the contact pieces, and a stopper is provided on the inside and outside of both the contact pieces to prevent the contact pieces from coming into contact with each other. A socket for an indicator light, characterized in that the socket is formed to face the ear part so as not to interfere with insertion of the indicator light.