JPS639070Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a leaf switch comprising three or more conductive elastic strips.

For example, a three-contact type leaf switch consisting of three elastic strips has three elastic strips 1a, 1b, and 1c arranged in parallel with their faces facing each other, as shown in Figure 1. Base parts 2a, 2b, 2c
is held by a support 3 made of synthetic resin. These free ends 4a, 4b, 4c are provided with contacts 5a, 5b, 5c, respectively, and the contacts come into contact with each other by bending the elastic strips 1a, 1b, 1c to establish electrical continuity. become. In this case, the contact points 5a of the elastic strips 1a and 1c on both sides,
There is one contact point 5c on the middle elastic strip 1b, each facing inward.
are provided as 5b' and 5b'' on both sides, totaling 4
contacts are formed. These contacts are operated by pushing up the pushing rod 6 provided at the free end 4a of the elastic strip 1a, so that the contacts 5a and 5b'' and the contacts 5b' and 5c come into contact with each other as shown in FIG. However, the elastic strips 1a, 1b, and 1c are electrically connected, and a current flows through the lead wires (not shown) connected to the respective connection ends 7a, 7b, and 7c.Therefore, in this conventional leaf switch, contact 5a,
5b and 5c will need to be formed four times,
It is inevitable that manufacturing costs will increase accordingly.

The purpose of the present invention is to provide a leaf switch that has the same number of contact points as the number of elastic stripes and has an effect equal to or better than that of a conventional leaf switch, and is inexpensive to manufacture. In contrast to a wide conductive main elastic strip with a contact point on one side of the free end, a plurality of conductive secondary elastic strips each have a contact on one side of the narrow width free end. arranged so that the contacts face each other,
Each of the secondary elastic strips is fixed to a supporting portion made of an insulating material so as to be stacked in sequence with respect to the main elastic strip at intervals, and the free end of each of the secondary elastic plates is connected to the main elastic strip. It is characterized in that the positions of the strips are shifted in the width direction so that the contact points of each of the auxiliary elastic strips come into contact with different positions of the contact points of the main elastic strip.

The present invention will be explained in detail based on the embodiments shown in FIG. 3 and below.

The leaf switch of the embodiment is composed of three conductive elastic strips made of phosphor bronze or the like, and includes a wide main elastic strip 10, two first and second auxiliary elastic strips 11, 12 is placed above it. Although these first and second auxiliary elastic strips 11 and 12 are arranged sequentially above the main elastic strip 10 with their faces facing each other, their free ends 13,
14 has a sufficiently narrow width, and the auxiliary elastic strips 11 and 12 are arranged parallel to each other with their positions shifted in both directions so that they do not come into contact with each other even when the free ends 13 and 14 are bent. The bases 15 and 16 of the first and second auxiliary elastic stripes 11 and 12 are made wide to ensure sufficient retention, and together with the main elastic strip 10 are supported by injection molding of synthetic resin. body 1
It is fixed by 7. The contacts 18 and 19 of the first and second auxiliary elastic stripes 11 and 12 are formed on the surfaces of the free ends 15 and 16 on the main elastic strip 10 side, respectively, and the contact points 20 of the main elastic strip 10 is formed on the surface of the free end portion 21 facing the secondary elastic strips 11, 12 so as to be in contact with the contacts 18, 19 of the secondary elastic strips 11, 12. 2
It has a wide width so that two contacts 18 and 19 can be contacted at the same time. Note that 22 is a pushing rod made of synthetic resin for driving the main elastic strip 10;
Reference numerals 3, 24, and 25 are connection ends for connecting lead wires to the main elastic strip 10 and the first and second auxiliary elastic strips 11 and 12, respectively.

Therefore, when the pushing rod 21 is pushed up from below as shown by the arrow, the main elastic strip 10 is bent upward,
Its contact point 20 first comes into contact with the contact point 18 of the first secondary elastic strip 11 and then this first secondary elastic strip 11
While pushing up the contact point 19 of the second auxiliary elastic strip 12, a contact state as shown in FIG. 5 is obtained, which corresponds to the contact state shown in FIG. 2 of the above-mentioned conventional leaf switch. is equivalent to By adjusting the displacement given to the pushing rod 22 during this contact, only the contact between the main elastic strip 10 and the first sub-elastic strip 11 can be obtained, and by further increasing the displacement, the second sub-elastic strip can be brought into contact. It is similar to a conventional leaf switch that contact with an elastic strip is also obtained.

However, by applying a driving force to the first and second auxiliary elastic stripes 11 and 12 individually, the contact between the first auxiliary elastic strip 11 and the main elastic strip 10, or the contact between the second auxiliary elastic strip 11 and the main elastic strip 10, 12 and the main elastic strip 10 can be used separately. This is an effect that cannot be obtained with the conventional leaf switch mentioned above.
In addition, in the embodiment, the auxiliary elastic strips 11 and 12 are
However, by arranging three or more sheets in parallel and further expanding the contacts 20 of the main elastic strip 10, it becomes possible to manufacture a leaf switch having a large number of contact circuits.

As explained above, the leaf switch according to the present invention uses three elastic strips, for example.
This has the advantage of requiring only one contact, simplifying the manufacturing process, and reducing costs.

[Brief explanation of the drawing]

Figure 1 is a side view of a conventional leaf switch, Figure 2 is a side view of a conventional leaf switch.
The figure is a side view of the leaf switch when it is in operation. Figure 3 and subsequent figures show an embodiment of the leaf switch according to the present invention. Figure 3 is a perspective view thereof, Figure 4 is a side view, and Figure 5
The figure is a side view of the operating state. 10 is a main elastic strip, 11 and 12 are secondary elastic strips, 15, 16 and 21 are free ends, 17 is a support body,
18, 19, and 20 are contacts, and 22 is a pushing rod.

Claims (1)

[Claims for Utility Model Registration] 1. A main elastic strip with a wide conductivity and a contact point on one side of the free end portion, and a conductive conductive strip with a contact point on each side of the narrow free end portion. A plurality of secondary elastic strips having the above-mentioned contact points are arranged so as to face each other, and each of the secondary elastic strips is laminated on a supporting portion made of an insulating material at intervals in sequence with respect to the main elastic strip. The free ends of each of the secondary elastic plates are shifted in position in the width direction of the main elastic plate, and the contact points of each of the secondary elastic plates are at different positions from the contact points of the main elastic plate. A leaf switch characterized by being in contact with each other. 2. The leaf switch according to claim 1, wherein each of the auxiliary elastic stripes has a wide base and a narrow free end.