JPH0625859Y2 - Push button switch - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention provides a power circuit improved to eliminate backlash when the switch button is operated and to prevent dust clogging and rainwater intrusion in the operation section. The present invention relates to an attached push button switch.

[Conventional technology]

FIG. 4 shows a sectional view of a conventional push button switch.

The push button switch has a hollow cover 2 having a guide tube 6 that extends upright at the center of the upper wall, a hollow cover 2 having an upper portion passing through the guide tube 6, and a flange-shaped stopper 11 in the middle. A cylindrical contact terminal 1 overhanging the
On the upper part of the contact terminal 1, vertically protruding from the center of the lower surface of the button main body 4, and fixed at the tip of a cylindrical operation boss 5 which is vertically slidably inserted in the guide cylinder 6 with a slight gap. And the switch button 3. When the switch button 3 is pressed, the operation boss portion 5 moves to the guide tube 6
The contact surface 1 is moved downward to move the contact terminal 1 downward to open and close the power supply circuit.

When the switch button 3 is released, it is returned to its original position in the upward direction by the action of a spring (not shown). At that time, the stopper 11 comes into contact with the inner surface of the upper wall of the cover 2 to restrict the movement in the pulling direction.

Here, as the vertical movement amount of the switch button 3 increases, the play in the radial direction of the switch button 3 increases, and the contact terminal 1 fixed to the switch button 3 may not accurately open and close the switch. In order to prevent this, the gap between the inner peripheral surface of the guide cylinder 6 and the outer peripheral surface of the operation boss portion 5 is set small.

[Problems to be solved by the device]

Due to the above structure, dust and rainwater may easily enter from the upper end portion of the guide cylinder 6, and the dust may be clogged in the gap between the guide cylinder and the operation boss portion 5 to cause malfunction of the switch.

An object of the present invention is to provide a push button switch which is free from the backlash of the switch button 3 as in the prior art, and which does not have a malfunction of the switch button 3 caused by clogging of dust or intrusion of rainwater into the contact terminal 1.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a switch button top wall with a boss portion to which a contact terminal is fixed and a tubular slide portion, and a guide tube is erected on a cover accommodating the contact terminal. Then, in the push button switch in which the inner peripheral part of the slide part is slidably engaged with the outer peripheral part of the guide cylinder, a plurality of dust particles are provided on the slide part from the tip of the slide part to the guide cylinder sliding contact direction. It is characterized in that a notch for escape is formed. Further, it is also effective that the slide portion is located so as to be surrounded by the inner side of the outer peripheral wall that is hung and coupled from the top wall of the switch button.

[Action]

Because of the above-mentioned configuration, in the normal state, the slide portion 7 is covered with the guide cylinder 6 to prevent dust from entering, and when the switch button 3 is operated, the outer peripheral surface of the guide cylinder 6 is slid. The contacting action of 7 causes the dust adhering to the outer periphery of the guide cylinder 6 to be scraped off. Here, the notch 13 of the slide portion acts as a discharge port for discharging the dust that has entered between the guide cylinder 6 and the slide portion 7 to the outside.

〔Example〕

1 (a) and 1 (b) are sectional views showing an embodiment of the push button switch of the present invention.

Similarly to the conventional case, a guide cylinder 6 is erected on the upper wall surface of the cover 2, and an operation boss portion 5 is protruded in the central part of the lower surface of the top wall 4 of the switch button 3 made of a synthetic resin in a state in which the operation boss 5 enters the guide cylinder 6. The lower end is fixed to the upper end of the contact terminal 1.

It should be noted that a relatively large gap is set on the outer peripheral surface of the operation boss portion 5 so as not to come into sliding contact with the inner peripheral surface of the guide cylinder 6.

Further, a cylindrical slide portion is provided in parallel with the operation boss portion 5 at an appropriate distance in the radial direction from the operation boss portion 5 so as to project in parallel with the operation boss portion 5, and the inner peripheral surface of the slide portion 7 is the guide cylinder outer periphery. It is inserted slidably up and down with a slight gap to the surface.

That is, since the slide portion 7 is arranged outside the guide cylinder 6, the slide portion 7 is provided to cover the guide cylinder 6.

When the switch button 3 is further pressed, the slide portion 7 slides on the outer peripheral surface of the guide cylinder 6 to scrape dust adhered to the outer peripheral surface of the guide cylinder 6 to the outside.

Since the guide tube 6 and the slide portion 7 are inserted with a small gap set therebetween, harmful backlash does not occur when the switch button 3 is operated. Further, an outer peripheral wall 12 is hung from the top wall 4 of the switch button 3 on the outside of the slide portion 7, and the slide portion 7 is surrounded by the outer peripheral wall 12 and protected from direct hits such as dust.

FIG. 2 is a further development of the shape shown in FIG.
The guide tube 6 and the slide portion 7 are formed in a prismatic shape in cross section, and a notch 13 is provided in a portion on the circumference of the slide portion 7 in contact with the guide tube 6 when the switch button 3 is not operated. It is divided into four four corner contact positions.

According to this embodiment, even if the dust enters between the guide tube 6 and the slide portion 7, the dust is absorbed in the slide portion 7.
It easily falls to the outside through the notch 13 provided in the.

FIG. 3 shows another embodiment, in which a plurality of pins 8 are concentrically provided on the upper wall surface of the cover 2 on the outer side of the guide cylinder 6 concentrically.

Further, on the lower side of the outer peripheral surface of the switch button 3, there is provided a flange portion 10 in which a plurality of slide holes 9 are evenly arranged, and the slide holes 9 are slidably inserted into the pins 8 with a small gap so that there is no play. Has been done.

According to this embodiment, it is possible to further reduce the backlash when operating the switch button 3 of FIG.

[Effect of device]

As described above, the present invention eliminates rattling when the switch button 3 is operated as in the prior art, and at the same time prevents dust from clogging the gap between the guide tube 6 and the slide portion 7 of the switch button to prevent malfunction of the switch button 3. In addition to the elimination, it is possible to achieve the intended purpose of preventing rainwater from entering the contact terminal 1.

[Brief description of drawings]

FIG. 1 (a) is a longitudinal sectional view showing an embodiment of the push button switch of the present invention, (b) is a sectional view taken along the line A--A of the upper view, and FIG. 2 is an embodiment in which FIG. 1 is further developed. Upward view showing
-A sectional view, FIG. 3 (a) is a vertical sectional view showing another embodiment, (b) is a plan view (upward view) showing a part of the switch button 3, and FIG. 4 (a) is a conventional view. FIG. 3B is a vertical sectional view showing the push button switch, and FIG. 1 ... Contact terminal, 2 ... Cover, 3 ... Switch button, 4 ... Top wall, 5 ... Operation boss, 6 ... Guide tube,
7 ... Slide part.

Claims (2)

[Scope of utility model registration request] 1. A switch button top wall is provided with a boss portion to which a contact terminal is fixed and a tubular slide portion, and a guide tube is erected on a cover for accommodating the contact terminal. In a push button switch in which an inner peripheral portion of the slide portion is slidably engaged with an outer peripheral portion, a plurality of notches for releasing dust are formed in the slide portion from a tip of the slide portion to a sliding direction of the guide cylinder. A push button switch characterized by the above. 2. The push button switch according to claim 1, wherein the slide portion is positioned so as to be surrounded by an inner side of an outer peripheral wall that is hung from a ceiling wall of the switch button.