JPS6020050Y2 - rotary switch - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rotary switch, which is applied to detecting the number of rotations of a tape recorder, for example, and has a simple and compact structure by housing a coil spring having a brush and terminal function between a plywood and a board. The purpose of this invention is to provide a rotary switch.

Conventional rotary switches are shown in FIGS. 1A and 1B.

In the figure, a rotary switch 1 has an insulating base plate 2.
is provided with a pair of protruding pin portions 2a.

A substrate 3 has a pair of electrode parts 4a and 4b, and is fixed to the upper surface of the base plate 2.

Reference numeral 5 designates l pairs of coil springs, each of which is fitted into an insulating cylindrical body 6 having a flange at one end.
It is fitted and attached to the paired pin portions 2a.

At this time, the brush portion 5a at one end of the coil spring 5 protrudes outward, and the terminal portion 5b at the other end extends from the electrode portions 4a, 4b, respectively.
is soldered to.

Reference numeral 7 denotes a flat pincushion-shaped insulating roller switch, which is provided with, for example, four conductive parts 7b that are electrically conductive with each other at positions equally divided around the center circumference R7a, and the above-mentioned pair of brush parts are provided on the circumference R7a. 5a is held in elastic contact.

Therefore, when the roller switch 7 rotates, the pair of brush portions 5a sequentially contact each pair of conductive portions 7b and insulating portions located at symmetrical positions, and move between the coil springs 5 at 2 times per rotation of the roller switch 7. The number of revolutions of the rotating body 7 is detected by closing the valve in batches.

However, according to the above conventional example, the flange-like cylindrical body 6 is especially required to fix the coil spring 5, which increases the number of parts, increases the number of assembly steps and costs, and there is a limit to miniaturization. There were drawbacks.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

Fig. 2 is an exploded perspective view of one embodiment of the rotary switch according to the present invention, Figs. Figures A to C are a bottom view, a partially cutaway side view, and a plan view, respectively, of a roller switch that constitutes the rotary switch.

In the figure, the rotary switch 11 roughly consists of a switch body 11a and a roller switch Ilb.

The switch body 11a has a resin base plate 12, and the base plate 1
As shown in FIG. 2, 2 has a through hole 13a in the central convex portion 13 and concave portions 13c on both sides below the convex portions 13b on both sides, and a pair of notches on each side of the central convex portion 14a of the front plate portion 14. 14
b and a convex portion 14c, a pair of pin portions 15 and a pair of elastic engagement claw portions 16 are integrally provided on both sides, and a positioning pin portion 24 is integrally provided on the bottom surface. It is installed protrudingly.

17. 17□ is a symmetrical coil spring, which extends from both ends of the coil portion 17a to form brush portions 17b and L.
A shaped terminal 17c is formed, and the coil portion 17a is fitted onto the pin portion 15 of the base plate 12.

At this time, the brush portions 17b are connected to the substrate 1 from the notch portions 14b, respectively.
2 protrudes forward, and the terminal portions 17c penetrate the both side recesses 13c and protrude upward from the rear of the substrate 12.

18 is a substrate, which has approximately the same shape as the base plate 12 in a plan view;
Pair of holes on both sides 18a1 Central hole 18b1 Front notch 18c
1 has a pair of notches 18d on both sides and a pair of notches 18e at the rear, and a circular part 19a and a narrow part 19 are provided at the notches 18e.
A pair of electrode portions 19 having a diameter b are formed.

This substrate 18 is placed on the base plate 12 in contact with the upper surfaces of the protrusions 13 and 14c by fitting the pin portions 15 into the holes 18a and fitting the notches 18c into the protrusions 14a, respectively.

At this time, each of the engaging claws 16 is once elastically displaced outward, then returned to its original position, and engages with the upper edge of the notch 18d as shown in FIGS. 3A to 3D.

Also spring 17. , 17□ each terminal part 17c is shown in FIG.
, C, it extends from the notch 18e to the rear of the electrode part 19, and both 17c and 19 are electrically connected and fixed by solder 20, respectively.

In this way, the base plate 12 and the base plate 18 are assembled together mainly by the retaining claws 16, and the switch main body 11a is completed.

This switch main body 11a is further attached to another board (not shown) by bolts passing through holes 18b and 13a after fitting and positioning the positioning pin portion 24, and connecting the lead wire from the rotation detector (both shown in the figure). (not shown) is fixed to the circular part 19a of the electrode part 19 by soldering.

At this time, the soldering heat applied to the electrode portion 19 is applied to the narrow portion 19b.
Due to this function, it is difficult for the solder to be transmitted to the rear, and the conductive portion of the solder 20 is not damaged, and the base plate 12 is not deteriorated by heat.

According to the above configuration, the substrate 18 not only provides a connection between the spring 17, the electrode section 19, and other lead wires, but also has the role of preventing the spring 17 from floating, and particularly serves as a function of preventing the spring 17 from floating. No holding parts are required, the number of parts and assembly man-hours can be reduced, and the overall size can be reduced.

Furthermore, since the base plate 12 and the base plate 18 are attached using the retaining claw portions 16, they can be detached freely.

The roller switch llb consists of a pair of discs 21 and 22 and a conductive ring 23.

The disk 21 is integrally formed with a cylindrical portion 21b having a hole 21a, and the disk 22 is integrally formed with a pair of ring-shaped protrusions 22c each corresponding to 1/4 circumference by a pair of notches 22b around the hole 22a. It is formed.

The conductive ring 23 has a hole 23a, and l pairs of convex conductive parts 23b, each corresponding to one circumference, are integrally formed on the outer periphery.

To assemble the champions 21 to 23, first attach the conductive ring 2.
For example, 1 each on the inner circumference of the ring-shaped protrusion 22c of the disc 22.
After the pair of conductive part 23b and cutout part 22b are engaged and installed, the cylindrical part 21b of the disc 21 is inserted into the hole 23at22a.
All you have to do is to fit them in common and attach and fix them.

In addition, if the fitting between the cylindrical portion 21b and the hole 22a is made tight at least, there is no possibility that the three members 21 to 23 will be unnecessarily disassembled.

Further, the outer peripheries of the ring-shaped protrusion 22c and the conductive portion 23b form a continuous and smooth circumferential groove 24.

The roller switch Ilb has its hole 21a connected to a rotating shaft (not shown) related to tape running of a tape recorder, for example.
It is fitted and fixed to the shaft and rotated continuously at a predetermined number of rotations.

Further, the pair of brush portions 17b of the switch body 11a are elastically displaced outward as shown by the two-dot chain lines in FIGS. Ru.

Therefore, as the roller switch llb rotates, the pair of brush parts 17b are electrically conductive to each other when they come into elastic contact with the pair of conductive parts 23b, so that the rotary switch 11 has a roller switch 11b with a 174 ON while rotating
Also, each brush portion 17b has a pair of ring-shaped convex portions 22.
When they come into elastic contact with c, they are electrically disconnected from each other, so the rotary switch 11 is similarly turned off during the next 174 rotations of the roller switch Ilb.

The tape rotation speed is detected by this ON/OFF signal.

As described above, according to the rotary switch of the present invention, the substrate having the electrode portion to which the terminal portion of the coil spring is soldered has approximately the same shape as the insulating base plate in plan view.
The coil spring, except for the brush part, is hidden under the board, so when handling the rotary switch by holding it between your fingertips, there is no way that your fingertips will touch the coil part of the coil spring. This eliminates the risk of the coil part being pulled out from the pin part, and since the board is fitted with the top of the pin part, even if the coil part tries to pull out from the pin part, it will not be stuck to the board. Therefore, even if the rotary switch receives a shock due to rough handling, the coil spring can be reliably prevented from coming off the plywood, and therefore the coil spring can be installed stably. In addition, the board can be assembled in a positioned state using the pin part, and there is no need for a dedicated spring holding member, so the number of parts can be reduced and the configuration can be made simple and compact. Since the board is attached by being engaged with the elastic retaining claws, it is easy to install the board, and it is also possible to remove the board, making repair work such as changing the coil spring easy. It has the advantage of being able to perform

[Brief explanation of drawings]

1A and 1B are a side view and a plan view of a conventional example of a rotary switch, FIG. 2 is an exploded perspective view of an embodiment of the rotary switch according to the present invention, and FIGS. 3A to 3D are respectively a side view and a plan view of a conventional rotary switch. Figures 4A to 4C are a front view, a top view, a rear view, and a side view of the switch body constituting the rotary switch, respectively. The figure is a diagram showing switch switching signals of the rotary switch. 1.11...Rotary switch, 2,12...
... Base plate, 2a, 15.24 ... Zen part, 3
．． 18...Substrate, 4 a, 4 b, 1
9=electrode section, 5, 17, . 17°... Coil spring, 5a, 17b... Brush part, 5b,
17c...Terminal part, 6...M-shaped body, ?
, 11 b--Roller switch, 7b. 23b... Conductive part, lla... Switch body, 16... Engaging claw part, 21, 22...
... Disk, 23... Conductive ring.

Claims (1)

[Scope of utility model registration request] A rotary switch in which a brush part functioning as a brush extends from a coil part of a pair of coil springs to one side elastically contacts a rotating slip ring, and rotation of the slip ring is detected by opening and closing between the brush parts. an insulating base plate having a pair of pin parts into which the coil part of the spring fits and having elastic engagement claws protruding from both sides; an electrode portion extending from the coil portion of the coil spring to the other side and having a terminal portion functioning as a terminal fixed by soldering; The pair of coil springs are assembled such that the coil part fits into the pin part and the brush part A rotary switch configured to protrude to the outside and be housed between the insulating base plate and the substrate with the terminal portion soldered to the electrode portion.