JPS6330152Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement in a three-hole socket.

When a large number of miniature light bulb groups attached to the sockets of a decorative miniature light bulb set are arranged in a series circuit, and such multiple sets are connected in a parallel circuit, at the two sockets that are the branch ends, It is necessary to use a socket with three cords connected, and this socket is commonly called a three-hole socket. In the conventional three-hole socket, one cord was connected to one terminal plate, and two cords were connected to the other terminal plate. However, in such a structure, unless the cord holding part of the terminal board to which two cords are connected is made larger than the cord holding part of the terminal board to which one cord is connected, the two cords cannot be held firmly. Since they could not be attached, the two terminal boards had to be of non-identical shape, and two types of terminal board manufacturing equipment and crimping equipment for cord connection were required, which was extremely uneconomical.

The purpose of this invention is to prepare three completely identical cord-connected terminal boards, one of which is stacked back-to-back.
When trying to solve the above-mentioned drawbacks by making it possible to attach one terminal board and its cord to one terminal board and its cord as usual on the other side, which side is for one terminal board or for two terminals? The purpose of the present invention is to solve this technical problem, since a new problem arises in that it is difficult to distinguish between terminal plate locking grooves.

The structure of the present invention to achieve the above object is that the upper part has a light bulb support member fitting hole that ends in a step, and the socket body has a central partition wall formed at the lower center of the light bulb support member fitting hole. Of the three same-shaped terminal plates with cords that form a bulge parallel to the bulkhead, the two terminal plates and the cords are placed back to back on the side with the bulge and below the step of the central bulkhead. The remaining terminal plate and cord can be attached at a location below the step between the side opposite to the side where the bulge is located and the central partition wall.

The following describes the embodiments shown in the accompanying drawings.

The upper part of the synthetic resin socket main body 1 is a light bulb support member fitting hole 3 that ends with a stepped portion 2, and a central partition wall 5 with a notch 4 provided at the center below the fitting hole 3.
is formed. A seemingly obvious bulge 7 is formed on the outer periphery of the socket body 1 and parallel to the central partition wall 5. Cords 11, 14,
Three terminal boards 13, 18, 19 of the same shape with 15
Of these, two terminal boards 18 and 19 are placed back to back.
Terminal plate guide groove 6', cord insertion hole 8', and terminal plate locking groove 9' for inserting and supporting the cords 14 and 15, and the side opposite to the side where the bulge 7 is located and the central partition wall 5. A terminal plate guide groove 6, a cord insertion hole 8, and a terminal plate locking groove 9 for inserting and supporting one terminal plate 13 and the cord 11 are formed in the bottom part 1' below the stepped part between them. ing. The width b of the cord insertion holes 8, 8' is smaller than the width a of the terminal plate guide grooves 6, 6'.

The protruding pieces 13a, 18a, 19a integrally formed at the lower part of the terminal plates 13, 18, 19 have cords 1
Two arm pieces 13b, 1 that fix 1, 14, 15
8b, 19b and two arm pieces 13c, 18c, 19c for caulking the bare wires 11', 14', 15' are provided for cord connection, which is the same as in the prior art.

Code 11
In order to insert the bare wire 11' through the bottom 1' of the socket body 1, insert the bare wire 11' into the terminal board guide groove 6 with the mounting side facing away from the partition wall 5, and make it protrude upward from the stepped part 2. After rotating the terminal board 180 degrees from the terminal, the terminal board 13 is inserted into the terminal board locking groove 10 by pulling the cord 11 downward. As a result, both jaws 13d of the terminal board 13 come into contact with the locking steps 9, the protrusion 12 provided on the side surface of the terminal board 13 sticks into the inner surface of the terminal board locking groove 10, and the terminal board 13 is pushed into the terminal board locking groove 10. It is fixed at 10.

Two terminal boards 1 that are used by overlapping each other
8 and 19, first insert one terminal plate 19 together with the cord 15 from the bottom 1' of the socket body 1, and then insert the remaining terminal plate 18 together with the cord 14, but in both cases, the bare wires 15', 14' is inserted with its mounting side facing in the opposite direction of the partition wall 5, and is made to protrude upward from the stepped portion 2. And only the terminal board 18
Rotate 180 degrees to bring the back surface 19' of the previous terminal board 19 into contact with the back surface 18' of the terminal board 18, and in this state pull the cords 14, 15 downward to connect these two terminal boards 18, 19. into the terminal plate locking groove 10'. In this way, the back to back terminal boards 18 and 19
Both jaws 18d, 19d of the terminal plate 18, 19 touch the locking step 9, and the protrusions 16, 17 provided on the side surfaces of the terminal plates 18, 19
1 and 7 while the terminal plates 18 and 19 are in contact with each other.
As shown in the figure, it is fixed in the terminal plate locking groove 10'. Of course, the width c of the cord insertion hole 8', into which two cords are inserted, must be larger than the width d of the cord insertion hole 8, into which only one cord is inserted.

When the light bulb support member 20 is inserted and installed into the socket body 1 according to the usual method, the two conductive wires 24, 2
4' are brought into contact with the terminal plates 13 and 18, respectively, and are energized, and the terminal plates 18 and 19 are connected to the back surfaces 18' and 18, respectively.
Needless to say, since the parts 9' are in contact with each other in a back-to-back manner, the current can be passed well. In the figure, 2
1 is a small light bulb, 22 is a cap, 23' is a body, 23
25 and 25' are holes for passing conductive wires 24 and 24'.

As is clear from the above description, according to the configuration of the present invention, since the seemingly obvious bulge 7 is formed on the outer side of the socket body 1, the two terminal boards 1
8, 19 will be used as a mark to know the position of the terminal board guide groove 6' into which it should be fitted, and similar terminal board guide grooves 6,
Even if the terminal boards 6' are separated to the left and right, the terminal boards 13, 18, and 19 can be quickly and accurately inserted into the terminal board guide grooves 6 and 6' without making mistakes, thereby increasing the efficiency of the terminal board mounting work. In addition, even if they are mixed with ordinary sockets, they can be immediately distinguished by the presence or absence of the bulge 7.

In the present invention as well, the center partition wall 5 is sandwiched between the left and right sides, and the terminal boards 13, 18, 19 are fitted and installed, but in particular, the two terminal boards 18, 19 and the cord with the bulging part 7 side facing each other are used. 14 and 15, there is enough space and it is possible to prevent the formation of extremely thin parts in the socket body 1.

In addition, since the three terminal boards 13, 18, and 19 to which the cords 11, 14, and 15 are connected are all of the same shape, the number of parts can be reduced, and only one terminal board manufacturing device and one cord connection crimping device are required. It becomes enough.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal sectional front view showing the state of use, FIGS. 2 and 8 are a plan view of the socket body, FIG. 3 is a bottom view, and FIG. 4 is a perspective view. Figure 5 is a vertical side view taken along the line A-A in Figure 4, Figure 6 is a front view taken along the line B-B in Figure 4, Figure 7 is a plan view, and Figure 9 shows how the cords are connected. It is a perspective view of each terminal board. DESCRIPTION OF SYMBOLS 1...Socket body, 1'...Bottom part, 2...Step part, 3...Light bulb support member fitting hole, 4...Notch part,
5...Central bulkhead, 6, 6'...Terminal board guide groove, 7
...Bulge, 8, 8'...Cord insertion hole, 9,
9'... Locking step portion, 10, 10'... Terminal plate locking groove, 11, 14, 15... Cord, 12... Protrusion, 13, 18, 19... Terminal plate, 16, 17...
...Protrusion, 18', 19'... Back side, a... Width of terminal board guide grooves 6, 6', b... Width of cord insertion holes 8, 8', c... Width of cord insertion groove 8', d... Width of the cord insertion groove 8.

Claims (1)

[Scope of utility model registration request] The upper part is a light bulb support member fitting hole 3 that ends at a step 2, and a central partition wall 5 is formed at the center below the light bulb support member fitting hole 3.A bulge parallel to the center partition wall 5 is formed on the outer periphery of the socket body 1. forming part 7, cord 11,
Three terminal boards 13, 1 of the same shape with 14, 15
8, 19, two terminal boards 1 placed back to back
8, 19 and the cords 14, 15 can be attached below the step 2 between the side where the bulge 7 is located and the central partition 5, and the remaining terminal plate 13 and cord 11 can be attached to the side where the bulge 7 is located. This decorative electric light socket can be attached at a location below a step 2 between the opposite side and the central partition wall 5.