JP2000260258A - Nc/no changeover switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To establish a small size construction of an NC/NO (normally closed/ normally open) changeover switch. SOLUTION: A dual type torsion coil spring of such a structure that the forefront parts of adjoining arms are coupled together by a coupling arm 13, is installed in a case 1 on one side thereof as a first torsion coil spring 9, and the coupling arm 13 is contacted resiliently with the undersurface of a push button 7, and one side of other arm is put in electric continuity to a second contact 5. A second torsion coil spring 10 is installed in the space between the two spring portions of the first torsion coil spring 9, and one of its arms is put in electric continuity to a common contact 6 while the other arm is folded up and down at the base and the forefront, and the folded part on the side with base is made a (+)-side contact and put in resilient contact with the first contact 3, and the upward folded-back part is made a (-)-side contact to be put in electric continuity to the common contact 6, and the forefront is located in a position below the push button 7 and also below the coupling arm 13 while the second contact 5 is located below the (-)-side contact.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch, and more particularly to a switch in which two positive contacts and two negative contacts are arranged in one resin case, and the common contacts are selectively used. And the NC / NO changeover switch configured as described above.

2. Description of the Related Art This type of conventional NC / NO changeover switch (normally close / normally open changeover switch) accommodates a slider in a resin case and has an inner surface of the case. In addition, there is provided a mold in which a negative terminal is molded on one side and the other side of the surface facing the slider and the center thereof, and one positive terminal which is in elastic contact with these terminals is molded on the slider. However, due to the configuration of switching by sliding movement, it is not possible to satisfy the recent demand for lighter, thinner and smaller devices due to the size increase. Therefore, a technical problem to be solved arises in order to provide a small-sized and highly durable NC / NO changeover switch, and an object of the present invention is to solve this problem.

Means for Solving the Problems The present invention has been proposed to achieve the above-mentioned object, and a first contact on the positive side is molded on a ceiling surface of a resin case to form one side of a floor surface of the case. On the other side of the case, the + second contact and the-common contact are separated from each other and molded. Further, a push button is provided on the ceiling surface on the other side of the case so as to be able to move up and down. An NC / NO change-over switch provided with an NC / NO switch change-over means operated by a depression of a push button, wherein a double torsion coil spring in which the tips of adjacent arms are connected by a connection arm is a first torsion coil spring. The first torsion coil spring is disposed on one side in the case, the connecting arm is elastically contacted with the lower surface of the push button, and one of the other arms is connected to the second contact, Furthermore, the first twist A second torsion coil spring is disposed in a space between the two torsion coil spring portions of the coil spring, and one arm of the second torsion coil spring is connected to the common contact, and the other arm is connected to the base. The upper and lower ends are bent up and down, and the bent portion on the base end side is elastically contacted with the first contact as a positive contact, and the push-back portion folded upward is connected to the common contact as a negative contact. Disposing the tip below the push button and below the connecting arm,
NC / N in which the second contact is arranged below the negative contact
An O changeover switch is provided.

An embodiment of the present invention will be described below in detail with reference to the drawings. 1A, 1B, and 1C show the inside of a detection switch according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a case made of a molded product of an insulating resin material, and a first contact 3 on the + side is molded on the ceiling surface 2 of the case 1, and one side of the floor surface 4 of the case 1 is connected to the other side. The second contact 5 on the positive side and the common contact 6 on the negative side are molded separately from each other. Further, a push button 7 is provided on the ceiling surface 2 on the other side of the case 1 so as to be able to move up and down, and a switch changing means 8 which is operated by the lowering of the push button 7 is provided in the case 1. An NC switch (normally closed switch) is switched to a NO switch (normally open switch). The switch switching means 8 includes a first torsion coil spring 9 and a second torsion coil spring 10
The first torsion coil spring 9 is connected to the adjacent arm 1
The first torsion coil spring 9 is disposed on one side of the case 1 and the connecting arm 13 is pushed. The lower surface of the button 7 is elastically contacted, and one arm 13 a of the other arm is electrically connected to the second contact 5. And, between the two torsion coil spring portions of the first torsion coil spring 9, 14, 1
A second torsion coil spring 10 is arranged in the space 4 and one arm 15 of the second torsion coil spring 10 is electrically connected to the common contact 6, while the other arm 16 is connected to the base side and the tip end. Bend up and down with the side, the bent part 1 on the base end side
7 is resiliently contacted with the first contact 3 as a positive contact, and the push-back portion 18 folded upward is connected to the common contact 6 as a negative contact. It is located below. According to such a configuration, first, in the initial state, the elasticity of the connecting arm 13 of the first torsion coil spring 9 causes the push button 7 to move.
Is located at the uppermost part, and one arm of the second torsion coil spring 10 is brought into electrical contact with the common contact 6 by elastic contact, and the other arm 13
The + side contact of a conducts to the first contact 3. For this reason, in the initial state, the first contact 3 and the common contact 6 conduct. The push button 7 is lowered from the initial position, the positive contact of the second torsion coil spring 10 is separated from the first contact 3, and the conduction between the first contact 3 and the common contact 6 is cut off. The push button 7 is further lowered from this position, and the connecting arm 13 of the first torsion coil spring 9 is used to move the second torsion coil spring 10.
When the other arm 13a of the second torsion coil spring 10 is turned to the floor side of the case 1 and the negative terminal of the other arm 13a of the second torsion coil spring 10 is conducted to the common contact 6, the second contact 5 and the common contact 6 are conducted. I do. Accordingly, an NC switch is configured until the second torsion coil spring 10 is separated from the first contact 3, the second torsion coil spring 10 is separated from the first contact 3, and the second contact 5 is connected to the common contact 6. A NO switch is configured until the switch becomes conductive. The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

As described above in detail in one embodiment of the present invention, the first contact on the + side is molded on the ceiling surface of the resin case, and the + first contact is formed on one side and the other side of the floor surface of the case. The second contact on the side and the common contact on the negative side are molded apart from each other, and further, a push button is provided on the ceiling surface on the other side of the case so as to be able to move up and down.
The NO switch switching means is composed of the first and second torsion coil springs, and the first and second torsion coil springs are arranged in the case in series and electrically separated from each other. This is an invention that exhibits a truly significant effect, such as achieving downsizing.

[Brief description of the drawings]

FIG. 1 is a partially cutaway view of an NC / NO changeover switch according to an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 case 3 first contact 5 second contact 6 common contact 7 push button 9 first torsion coil spring 10 second torsion coil spring 13 connecting arm

Claims (1)

[Claims] 1. A positive first contact is molded on a ceiling surface of a resin case, and a positive second contact and a negative common contact are separated from each other on one side and the other side of the floor of the case. NC / NO changeover switch provided with a push button on the ceiling surface on the other side of the case so as to be able to move up and down, and provided with an NC / NO switch changeover means operated by lowering the push button in the case. Wherein a double torsion coil spring in which tips of adjacent arms are connected by a connection arm is used as a first torsion coil spring.
Is disposed on one side in the case,
The connecting arm is elastically contacted with the lower surface of the push button, and one of the other arms is electrically connected to the second contact. Further, the second arm is inserted into the space between the two torsion coil spring portions of the first torsion coil spring. And one arm of the second torsion coil spring is electrically connected to the common contact, and the other arm is bent up and down on the base side and the tip side to form the second torsion coil spring. The first bent portion as a positive contact.
The push-back portion which is elastically contacted with the contact and turned upward is electrically connected to the common contact, and the tip is disposed below the push button and below the connecting arm as a -side contact;
An NC / NO changeover switch, wherein the second contact is disposed below a side contact.