JPH047540Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a small switch that requires extremely small installation space.

(Conventional technology) Turns on/off by operating the electrical contacts for the keyboard of OA equipment or the screen opening/closing lid of a small LCD television receiver.
Conventionally, a small micro switch has been used as a power switch that is turned off, and also a power switch that is turned on and off when the card radio's earphones are connected and separated.

As shown in FIG. 3, the operating principle of the basic switch, the conventional micro switch 1 has one end of a tension member 2 fixed to a fixed base 3, the other end being a free end, and a movable contact 4 provided at the tip of the tension member 2. The other end of the compression member 5, which has one end fixed near the tip of the member 2, is held in a compressed state by a receiver 6. Furthermore, tension member 2
A snap action by a tension member 2 and a compression member 5 in response to an external force 7 applied from a direction perpendicular to the
The movable contact 4 is configured to come into contact with one of the two fixed contacts 8 and 9.

Since such a conventional micro switch 1 switches the contacts by a snap action, it is possible to reliably interrupt and conduct the electric circuit.
It is widely used in various electronic devices.

(Problem to be solved by the invention) Regarding the above-mentioned micro switch 1, a small one is also available, but in order to switch the contact point with a snap action, the leaf spring of the tension member 2, etc. The length l in the lateral direction with respect to the pressing direction of the external force 7 greatly influences the stroke of the movable contact 4. Therefore, if the tension member 2 and the like are shortened in order to shorten the lateral length l with respect to the external force 7, the movable contact 4
The snap action operation and contact with the fixed contacts 8 and 9 cannot be ensured, and the reliability of electrical circuit interruption and continuity is reduced. Therefore, the length of the tension member 2 etc. cannot be reduced much, and the microswitch 1 requires a correspondingly large amount of installation space in the plane orthogonal to the pressing direction. As a result, this became a factor that hindered miniaturization of the device, and there was also the problem that the switches could not be arranged with a sufficiently high packaging density.

The purpose of the present invention was made in view of the above-mentioned circumstances, and is to provide a compact switch that requires an extremely small installation space on a surface perpendicular to the pressing direction and that allows stable switching of contacts. It's about doing.

(Means for Solving the Problems) In order to achieve the above object, the small switch of the present invention narrows the opening at one end of a conductive cylinder, fixes an insulating material, and attaches a conductive material to this insulating material. A fixed terminal is provided, and at the inner end of the fixed terminal is formed an elastic gripping part having a C-shaped cross section with an opening facing inward and having an inner side wider than the opening width, and an opening at the other end of the cylindrical body. An electrically conductive movable terminal formed with an insertion pin having a neck portion and a head portion at its tip that can be press-fitted into the gripping portion by squeezing the inner end of the tube is slidable so as not to slip out outwardly. a coil spring is compressed between the movable terminal and the insulating material, the movable terminal is pressed against the elasticity of the coil spring, and the insertion pin By press-fitting the cylindrical body and the fixed terminal into the holding part, the cylindrical body and the fixed terminal are electrically connected to each other.

(Function) The insertion pin of the movable terminal, which is slidably arranged in the opening at the other end, is press-fitted into the gripping part of the fixed terminal fixed to the opening at one end of the cylinder via an insulating material, and the terminal is movable with the fixed terminal. Since the terminals are electrically connected to each other, all the constituent members are incorporated into the cylindrical body, and the installation space can be made extremely small with respect to the plane perpendicular to the pressing operation direction. In addition, since the insertion pin of the movable terminal is press-fitted by expanding the opening of the gripping part of the fixed terminal, the sliding contact area between the gripping part and the insertion pin is cleaned by friction, ensuring reliable electrical continuity. can get. Furthermore, since the insertion pin, which has a neck and a head at its tip, is press-fitted into the elastic gripping part that has a C-shaped cross section and is wider inside than the opening width, the opening edge of the gripping part can be pressed against the head of the insertion pin. When the largest diameter part of the section passes through,
The click action reduces the force required to press the movable terminal, providing excellent operability.

(Description of Embodiments) Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal cross-sectional view of one embodiment of the small switch of the present invention, and FIG. 2 is an enlarged view of the main part of FIG. 1 when the insertion pin is press-fitted into the gripping part.

In Figures 1 and 2, small switch 1
0 has an insulating material 12 fixed to it by narrowing the opening at one end of a thin cylinder 11 made of conductive metal. A conductive fixed terminal 1 is inserted through this insulating material 12 in the axial direction.
3 is fixed, and the inner end of the fixed terminal 13 is formed with an elastic gripping part 13a that has a C-shaped cross section with an inward opening and is wider inside than the opening width.
The diameter of the opening at the other end of the cylindrical body 11 is narrowed by a diaphragm, and the movable terminal 14 made of conductive metal can freely slide without causing the pressing operation part 14a to protrude outward. is fitted in.
The movable terminal 14 slides on the inner periphery of the cylindrical body 11 to ensure electrical continuity between the cylindrical body 11 and the movable terminal 14. Further, an insertion pin 14b having a neck portion and a head portion at the tip thereof that can be press-fitted into the opening of the gripping portion 13a of the fixed terminal 13 at the inner end portion of the movable terminal 14.
is provided. Note that the diameter of the head of the insertion pin is slightly larger than the opening width of the gripping portion 13a. Then, when the insertion pin 14b is pressed against the gripping part 13a, the gripping part 13a expands the opening width by elastic deformation to allow insertion of the head of the insertion pin 14b, and then moves the neck of the insertion pin 14b to the edge of the opening. Hold it in place.
Further, a coil spring 15 is compressed between the movable terminal 14 and the insulating material 12.

In such a configuration, if the pressing operation part 14a is not pressed first, the movable terminal 1 is pressed as shown in FIG.
The insertion pin 14b of No. 4 is inserted into the gripping portion 13 of the fixed terminal 13.
The electric circuit between the movable terminal 14 (furthermore, the cylindrical body 11) and the fixed terminal 13 is interrupted without contacting the terminal a.

Next, press the pressing operation part 14a onto the coil spring 1.
If you press against the elasticity of 5, as shown in Figure 2,
The head of the insertion pin 14b elastically deforms the gripping part 13a to allow press-fitting, and then the insertion pin 14b
The neck portion of the gripper is gripped by the opening edge of the gripping portion 13a. During this press-fitting, the opening edge of the biting part 13a and the insertion pin 1
The sliding surface of the head of 3a is strongly rubbed, and carbon and the like generated by arc discharge etc. when cut off are removed and cleaned. Therefore, the insertion pin 14 is inserted into the bite part 13a.
By press-fitting b, the electric circuit between the movable terminal 14 (and the cylindrical body 11) and the fixed terminal 13 is reliably electrically connected. Since the neck of the insertion pin 14b is held by the opening edge of the holding part 13a, when the largest diameter part of the head passes through the opening edge, the force required to press the pressing operation part 14a is reduced due to the click action. and has excellent operability.

Then, when the pressure of the pressing operation part 14a is released, the movable terminal 14 is separated from the fixed terminal 13 due to the elasticity of the coil spring 15, and the electric circuit between the movable terminal 14 (and the cylindrical body 11) and the fixed terminal 13 is separated. is blocked as shown in FIG.

Therefore, a switch function for making the electric circuit conductive can be obtained by pressing the pressing operation portion 14a.

Here, in the above structure, all of the constituent members are assembled in the cylinder 11, and a small switch can be constructed that requires an extremely small installation space in a plane perpendicular to the direction of the pressing operation.

(Effects of the invention) As explained above, according to the small switch of the invention, the openings at both ends of the cylindrical body are narrowed, the insulating material is fixed, and the movable terminal can be slid freely to prevent it from slipping out. It has a simple structure, such as being disposed in a cylindrical body with a small diameter, and all the constituent members are assembled in a small-diameter cylinder, so that the installation space can be extremely small with respect to a plane perpendicular to the pressing operation direction.
Therefore, the space required for the device is small, the device can be downsized, and it can be mounted with high density. The entire cylindrical body constitutes one terminal of the electric circuit, so when mounting it on a printed wiring board etc., the cylindrical body as a terminal can be easily connected to the printed wiring circuit, making it possible to easily connect the cylindrical body as a terminal to the printed wiring circuit. Easy to implement. In addition, since the opening width of the fixed terminal's holding part is expanded and the insertion pin of the movable terminal is press-fitted, the sliding surface is cleaned by friction, ensuring reliable electrical circuit continuity, and the holding part of the fixed terminal is press-fitted. There is a pressing movement width in which the part and the insertion pin are in sliding contact, so the electric circuit will not be interrupted by a slight retraction of the movable terminal. Furthermore, when the maximum diameter portion of the head of the insertion pin passes through the opening edge of the gripping portion, the force required to press the movable terminal is reduced due to the click action, resulting in excellent operability.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of one embodiment of the small switch of the present invention, and FIG. 2 is an enlarged view of the main part when the insertion pin is press-fitted into the gripping part in FIG. 3
The figure is a diagram showing the operating principle of a basic switch of a conventional micro switch. 10...Small switch, 11...Cylinder body, 12...
...Insulating material, 13... Fixed terminal, 13a... Holding part, 14... Movable terminal, 14b... Insertion pin, 1
5...Coil spring.

Claims (1)

[Scope of utility model registration request] An insulating material is fixed by narrowing the opening at one end of a conductive cylinder, a conductive fixed terminal is provided on this insulating material, and a cross section C shows an inward opening at the inner end of the fixed terminal.
A neck part that is shaped like a letter and has elasticity wider inside than the opening width is formed, and a neck part that can be press-fitted into the gripping part at the inner end by squeezing the other end opening of the cylinder body, and a head part at the tip thereof. A conductive movable terminal formed with an insertion pin having a conductive movable terminal is arranged to be able to slide freely so as not to escape outwardly and to be electrically connected to the cylindrical body, and between the movable terminal and the insulating material. A coil spring is compressed in the coil spring, the movable terminal is pressed against the elasticity of the coil spring, and the insertion pin is press-fitted into the gripping part, thereby establishing conduction between the cylindrical body and the fixed terminal. A small switch characterized by being designed to