JPS5960979A - Method of producing adapter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an adapter used between a flat blade plug and a round blade plug when connecting the same to an outlet for a round blade plug.

In Japan, the United States, the United Kingdom, etc., flat blade plugs are generally used. On the other hand, in other European countries except the UK, round-shaped plugs are generally used, and electrical outlets designed for round-shaped plugs are also used. Therefore, when taking electrical appliances used in Japan and other countries to European countries other than the UK, it is not possible to directly insert a flat blade plug into an outlet for a round blade plug. An adapter is required to convert the blade to a round plug blade.

An adapter that converts a flat blade to a round blade includes a blade holder spring that receives the flat blade and a round blade.

The blade holder spring and round plug blade are fixed to each other by caulking,
The casing (body) is made into one piece (bung blade block).
It is usually housed in.

Conventionally, the round plug blade and blade holder spring were caulked together as follows. However, since the blade holder should not prevent the pushing part of the crimping punch from reaching the crimping part at the bottom of the blade holder spring, the bottom part should be folded double as shown in Figure 1. The blade receiving part 1 was made to extend in three directions from the first part, and the head of the round plug blade 3 was caulked 4 at the double folded bottom part 2. However, in this case, the bending process of the blade holder spring 5 is complicated, and since the blade holder 1 stands up from a single point on the bottom 2, the mechanical strength is poor, and the blade of the blade holder 1 is pinched. Since the applying force was weak, there was a problem in that the reliability of contact with the plug blade was low.

Therefore, in order to facilitate the bending process and improve mechanical strength and contact reliability, the bottom part 7 of the blade receiving spring 6 is formed into a U-shape, and the caulking part 8 is formed as shown in FIG. It is conceivable to make a through hole 10 in the upper blade receiving part 9 through which the pressing part of the caulking punch passes. In the figure, number 3 is the main plug blade. Since the pushing part of the punch is large, if a through hole is provided to pass it through, the mechanical strength of that part will be weakened. Therefore, it becomes necessary to increase the plate width of the blade receiving spring, but this results in an increase in the size of the blade receiving spring and an increase in material costs, resulting in high costs.

This invention was made in view of these circumstances, and even though it is small, it has strong mechanical strength and high contact reliability.
Furthermore, the present invention provides a method for manufacturing an adapter having a blade receiving spring that can be easily bent.

In this invention, when connecting the blade receiving spring and the main plug blade of an adapter including a blade receiving spring for receiving the plug blade of a flat plug blade type plug and a main plug blade for inserting into a round column blade type outlet, the main plug blade is connected to the main plug blade. A presser foot in which a caulked part formed at the top protrudes from the through hole of a blade receiver spring having a U-shaped bottom and a through hole provided at the bottom, and is inserted into the U-shape from the side of the blade receiver spring. The gist of the present invention is to provide a method for manufacturing an adapter, which is characterized in that the caulked part of the main plug blade is pressed down by the following steps. DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings, including examples thereof.

FIGS. 3 and 4 are explanatory diagrams of the caulking process in the adapter manufacturing method according to the present invention.

As shown in the figure, in this embodiment, the bottom part 12 of the blade receiving spring 11 is U-shaped, and a through hole 13 is provided in the bottom part 12.
A small diameter through hole 15 is provided in the blade receiving portion 14 located above the through hole 13. This blade receiving spring 11 has almost the same shape as the blade receiving spring 6 shown in FIG. 2, but the size of the through hole 15 provided in the blade receiving part 4 is smaller. However, it is different. Since the bottom portion 12 of this blade receiving spring 11 is formed in a U-shape, it has strong mechanical strength and high contact reliability, and is also easy to bend. In addition, since the through hole 15 is small, the blade receiving spring 11
The plate width is small and the mechanical strength is sufficiently strong.

A punch device for caulking the blade receiving spring 11 and the main plug blade 16 by implementing the manufacturing method according to the present invention has the following structure. As shown in FIGS. 3 and 4, this punch device includes a caulking receiver die 17 and a caulking punch 18. The die 17 has a vertical hole 19 into which the main plug blade I6 is inserted and fixed, and a presser foot 20.
have.

The presser foot 20 has a support portion 20a and a presser portion 20b that extends horizontally from the upper end of the support portion 20a and reaches above the vertical hole 19. The support part 20a has a vertical hole 2 provided in the base 17 at the bottom.
1 so as to be vertically movable, and is always urged in the direction of being pushed outward by a coil spring 22 provided in a vertical hole 21. Vertical hole I9 on the lower surface of the tip part of the presser part 20b
A protrusion 23 for caulking is provided directly above the protrusion 23, and this protrusion 23 serves as a pressing part. The punch 18 has two pressing rods 18a and 18b arranged vertically in parallel,
The pressing rod 18a presses against the protrusion 23 on the upper surface of the tip portion of the pressing portion 20b.
The pressing rod 18b presses the upper surface of the support portion 20a.

This punch device is used as follows.

After forming a caulking part on the top of the main plug blade 16, the vertical hole 1
Insert this main plug blade 1G into 9. And the blade holder spring 11
on top of it, and place the caulked part of the main plug blade 16 on the blade holder spring 1.
1 into the through hole 13 of No. 1.

At this time, the presser foot 20b of the presser foot 2° is inserted into the U-shape from the side of the blade receiving spring 11 at the same time or before or after. Next, lower the punch 18,
The pressing rods 18a and 18b push down the presser portion 20b and the support portion 20a against the coil spring 22. When the holding part 20b is lowered, the protrusion 23 presses down the covering part of the main blade 16 to form a caulking part 16a, and the main blade 16 and the blade receiving spring 11 are caulked together. In this way, since the pressing part is inserted from the side of the blade receiving spring 11, the diameter of the pressing rod 18a of the punch can be reduced, and therefore, as described above, the through hole provided in the blade receiving spring 11 can be reduced. 15 may be small.

The integral body of the blade holder spring and the circular column blade obtained as described above is then fixed to the body of the adapter. As shown in FIG. 5, the body 24 is similar to the conventional one, and has two grooves 25 which are half of the insertion area of the flat blade.
．． 25, and on the opposite side of the groove 25 and 25, there is a groove 26, 26 into which the cylindrical blade 16 is fitted. two grooves 26.26
A protrusion 27, 27 is provided on the inside of each.

In the figure.

28 is a through hole into which the poles 1 to 1 are inserted. Blade holder spring 1
Insert the U-shaped part of 1 into the protrusion 27 and attach the round pillar blade 1.
6 into the groove 2G, the integral body of the blade receiving spring 11 and the cylindrical blade 16 is temporarily fixed to the body 24. next,
Align the body 24 with the body 24, which has almost the same shape as the body 24 except that it does not have the protrusion 27, and fix both with bolts and nuts to form the structure shown in Fig. 6 (a) and (b). Get an adapter. In the figure, 28 is a cover 129 is an insertion opening for a flat plug blade.

30 is a bolt.

Note that the caulking step of the manufacturing method according to the present invention can also be carried out using a punching device as shown in (al to (C)) in FIG. 7.As shown in the figure, this punching device is equipped with a caulking die 31 and a caulking punch 32.A horizontally long groove 33 and a vertical hole 34 are provided in the caulking die 31, and a stand 35 is slidably fitted into the groove 33.Base 35 A vertical hole 36 into which a round column blade is inserted and fixed is provided on the top surface of the table 35, and a handle 37 is fixed on the front surface of the stand 35.A presser foot 38 is arranged in the vertical hole 34.The presser foot 38 is It has a pressing part 38a and a supporting part 38'b that supports the pressing part 38a.The pressing part 38a protrudes horizontally from two sides of the supporting part 38b, and the tip of the pressing part 38a extends vertically when the table 35 is pushed. It reaches above the position of the hole 36. A projection 39 is provided on the lower surface of the tip of the pressing portion 38a.
For example, it is provided directly above the position of the vertical hole 36 when the table 35 is pushed in. The support portion 38b is inserted into the vertical hole 34 so as to be vertically movable, and is biased in a direction to be pushed outward by a coil spring 40 provided in the vertical hole 34. The punch 32 has a small-diameter pressing rod 32a and a wide-diameter pressing rod 32b.
The upper surfaces of the proximal bones of 8a are pressed respectively.

This punch device is used as follows.

First, pull the handle 37 and pull out the stand 35. A cylindrical blade is inserted into the vertical hole 36 of the base 35, and the caulked portion of the cylindrical blade is inserted into a through hole provided at the bottom of the blade receiving spring. Next, push the handle 37 and push in the stand 35. At this time, the tip of the holding portion 38a is inserted into the U-shape from the side of the blade receiving spring. The punch 32 is moved downward, and the pressing rod 32a and the pressing rod 32 are moved against the coil spring 40.
Press b to push the pressing part downward. Then, the caulked portion of the circular columnar blade is crushed by the protrusion 39, and the blade receiving spring and the circular columnar blade are caulked.

In the embodiment described above, the pressing rod is used to press the area directly above the pressing part (caulking projection), but it is not necessary to do so. It is also possible to press the side closer to the support part of the presser foot. In this way, there is no need to make a through hole in the blade receiving spring into which the pressing rod is inserted. If the through holes are not formed, the mechanical strength of the blade receiving spring will be further increased, and manufacturing will be easier. However, if you press just above the pressing part, you have the advantage of requiring the least amount of force.

The manufacturing method of the adapter according to the present invention is such that the blade receiving spring is shaped as described above, a caulked portion is formed at the top of the circular columnar blade, and the caulked portion is formed into a blade receiving spring. The caulked part is pressed down with a presser that protrudes from the bottom through-hole of the spring and is inserted into the U-shape from the side of the blade holder spring, so even though it is small, it has strong mechanical strength and can be easily contacted. It is now possible to obtain an adapter with a blade receiving spring that is highly reliable and can be easily bent.

[Brief explanation of drawings]

Figure 1 is a partially cutaway perspective view of a conventional round plug blade and blade holder spring integrated into one body, and Figure 2 shows a round plug blade with a U-shaped bottom and a U-shaped bottom that is pressed into the blade holder. FIGS. 3 and 4 are explanatory diagrams of the caulking process of the adapter according to the present invention; Figure 5 is a plan view of the round plug blade and blade holder spring temporarily fixed to the body, Figure 6 (al is a plan view of the adapter, Figure 6 (bl is a side view of the adapter) , FIG. 7 fa) is a plan view of the caulking die of the caulking device used to implement the split shape of the adapter according to the present invention, and FIG. 7(b) is a cross-sectional view of a part of the caulking punch of the same caulking device. Side view, same tc+
1 is a vertical sectional view showing a part of the crimping device without cutting away. 11...Blade holder spring 12...Blade holder spring bottom 13.
...Through hole 16...Round plug blade 20,38...Press agent Patent attorney Takeshi Matsumoto Floor beam 1 Figure 2 422- Figure 4

Claims (1)

[Claims] (11 When connecting the blade holder spring and the round plug blade of an adapter equipped with a blade holder spring that receives the plug blade of the flat plug blade type plug and a round plug blade for inserting into a round pillar blade type outlet, the round plug blade The broken caulked part formed on the top of the blade holder spring was made to protrude from the through hole of the blade holder spring, which has a U-shaped bottom and a through hole at the bottom, and was inserted into the U-shape from the side of the blade holder spring. A method for manufacturing an adapter characterized by pressing down the caulked part of the nine-stop blade with a presser foot.