JPS6331307Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a rotary switch used to turn on and off a portable light.By using a coil spring as a contact point, the structure is simplified and the rotational force when operating the switch is reduced. The purpose is to facilitate switch operation.

A conventional rotary switch of this type was constructed as shown in FIGS. 4 and 5. That is,
Reference numeral 21 denotes a metal case that houses a battery 22, and one end of this metal case 21 has a notch 23 in a part of its circumference.
A cylindrical metal body 24 is fixed to the metal body 24, and a plate spring 27 having one contact 25 and a convex portion 26 that fits into the notch 23 is housed inside the metal body 24. An insulator 2 having a contact 28 that connects and separates from the contact 25 of
9 and a rotary body 31 having a plurality of recesses 30 on its inner circumference into which the convex portions 26 of the leaf spring 27 are fitted, are fixed with a rivet 32 with the metal body 24 in the middle. In order to operate this rotary switch, by rotating the rotating body 31, the insulator 29 simultaneously rotates and the other contact point 28 is connected to the leaf spring 2.
It makes contact with one contact 25 provided at 7 to form an electric circuit. However, in this conventional rotary switch, the amount of displacement of the convex portion 26 of the leaf spring 27 over the concave portion 30 of the rotating body 31 is
7, there was a limit to how much the rotational force of the switch could be reduced.

In view of the above-mentioned problems of the prior art, the present invention provides a rotary switch that can reduce the rotational force required when operating the switch. The present invention will be described below with reference to the drawings showing the embodiments thereof.
The figures show a small portable lamp using the rotary switch of the present invention. In Figs. 1 to 3, reference numeral 1 denotes the main body of the portable lamp housing a battery 2, and a main body cover 3 is screwed to one end of the main body 1. Reference numeral 4 denotes a metal plate located inside the main body cover 3 and fixed to one end of a power cord 5. This metal plate 4 is connected to a battery contact piece 6 mounted inside the main body 1.
The power cord 5 is flexible and
A metal plate 7 which constitutes one of the electric circuits is fixed to the other end. Reference numeral 8 denotes a coil spring having one end fixed to the metal plate 7, and the other end of this coil spring 8 is provided with a protrusion 9 which constitutes a contact. Reference numeral 10 denotes a contact having a U-shaped cross section which constitutes the other electric circuit, and one end of this contact 10 is connected to a core 11 inside the power cord 5, and an insulating plate 12 is interposed between this contact 10 and the metal plate 7.

A case 13 is rotatably attached to the power cord 5, and this case 13 houses the coil spring 8 and the like. A case cover 14 is screwably attached to the case 13, and a socket 16 for holding the outer periphery of the light bulb 15 is attached inside the case cover 14. Further, a plurality of recesses 17 are provided on the circumference of the end surface of the case cover 14 on the side that contacts the coil spring 8, and a contact point 18 integrally provided from the socket 16 is arranged in every other recess 17. . 19 is case cover 14
This is a reflecting mirror attached to the tip of the bulb 15 to condense the light from the bulb 15. Tail end 1 of the light bulb 15
5' is constructed so that by screwing the case cover 14 onto the case 13, it is brought into contact with the other end of the contact 10 to constantly form the other electric circuit. Further, when the case 13 is rotated, the convex part 9 of the coil spring 8 comes into contact with a contact 18 provided in the concave part 17 of the case cover 14, which rotates simultaneously with the case 13, to form one electric circuit,
When the protrusion 9 of the coil spring 8 moves to the recess 17 where the contact 18 is not provided, one electric circuit is opened, and the case 13
By rotating the light bulb 15, the light bulb 15 can be turned on and off repeatedly.

Note that the portable light employing the rotary switch is used by inserting the clip 20 provided on the main body 1 into the chest, etc., but when operating the switch during this use, the convex portion 9 of the coil spring 8 closes to the case cover. 14 can be absorbed by the entire coil spring 8, so the rotational force of the switch becomes very light. Furthermore, in order to increase the contact pressure between the protrusion 9 of the coil spring 8 and the contact point 18 of the case cover 14, even if the rigidity of the coil spring 8 is increased, the angle A of the protrusion 9 of the coil spring 8 will be reduced as shown in FIG. By increasing the size, the resistance when the convex part 9 of the coil spring 8 overcomes the concave part 17 of the case cover 14 can be reduced, so that the rotational force of the switch can be reduced.

As described above, the rotary switch of the present invention has a recess in the end surface of the case cover attached to the case that comes into contact with the coil spring, one contact is disposed in this recess, and the coil spring accommodated in the case is provided with a recess. The other end is provided with a convex part that becomes the other contact, and the convex part and the one contact are brought into contact and separated by the rotation of the case to open and close an electric circuit. Since the contacts are made of coil springs, this has the practical effect of reducing the rotational force required to operate the switch.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a small portable electric light employing a rotary switch according to an embodiment of the present invention, Fig. 2 is an enlarged side sectional view of the main part, Fig. 3 is a side view of the same, and Fig. 4 5 is a partial side sectional view of a portable electric light employing a conventional rotary switch, and FIG. 5 is a sectional view taken along the line A--A in FIG. 4. 5...Power cord, 8...Coil spring, 9...
Convex portion, 13...case, 14...case cover,
17... recess, 18... contact.

Claims (1)

[Scope of utility model registration request] A power cord having one end of a coil spring fixed thereto, a case rotatably attached to the power cord and housing the coil spring, and a case cover attached to the case, the side of the case cover in contact with the coil spring. A recess is provided in the end face of the coil spring, one contact is disposed in the recess, and a protrusion serving as the other contact is provided at the other end of the coil spring, and the protrusion and the one contact are connected by rotation of the case. A rotary switch that opens and closes an electric circuit by connecting and disconnecting it.