JP2514180Y2 - Push switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a push switch used for various input devices such as a computer and a word processor.

[Conventional technology]

As shown in FIG. 4, the conventional push switch has a concave portion 2 provided on the top surface 1a of the stem 1 and a convex portion 4 of the key top 3 arranged on the concave portion 2.
Is tightly fitted and fixed, and the spring 5 is compressed and lowered by pressing the key top 3, so that the switch contacts in the switch case 6 are switched.

Also, these days, as shown in FIG. 5, the top surface of the stem 1
1a is urged upward by a spring 5 and abuts on the flange portion 7 on the lower surface of the key top 3, and the flange portion 7 of the key top 3 is attached to the panel 8
There is a push switch that is locked to the lower surface of the switch and switches the switch contact in the switch case 6 by pressing the key top 3 as in the switch shown in FIG.

FIG. 6 is a sectional view embodying a push switch of the type shown in FIG.

The same parts as those shown in FIGS. 4 and 5 are designated by the same reference numerals.

In FIG. 6, a switch case composed of an upper case 9 and a lower case 10, a stem 1 slidably mounted along the upper case 9 and partially protruding from an opening 11 of the upper case 9, and a lower case. It is mainly composed of an urging means such as a compression spring 5 interposed between the stem 10 and the stem 1, a movable contact piece 13 for opening and closing a contact according to the sliding movement of the stem 1, and a fixed terminal 14. . Due to the elasticity of the compression spring 5, the top surface 1a of the stem 1 elastically contacts the lower surface of the key top 3, the collar portion 7 of the key top 3 is elastically locked to the lower surface of the panel 8, and the upper portion 15 of the key top 3 is the panel. It projects upward from the hole 16 of No. 8. Reference numeral 24 is a printed circuit board to which a push switch is attached.

FIG. 6 shows the unstopped state of the key top 3, and the stem 1
The cam 17 formed integrally with the contact point 13a of the movable contact piece 13
Since the elastic arms 18 are displaced to the right by contacting the elastic arms 18 provided on both sides of the movable contact piece 13, the contact portions 13a of the movable contact piece 13 are fixed to the fixed terminals 14.
The switch contact is turned off, and when the push-button 3 is pressed downward against the elasticity of the spring 5, the engagement between the cam 17 and the elastic arm 18 is released, so that the movable contact piece 13 is accompanied by the contact portion 13a. It is displaced to the left, the contact portion 13a and the fixed terminal 14 come into contact, and the switch contact is turned on.

[Problems to be solved by the device]

By the way, it is necessary to apply grease to the stem 1 of the push switch so that the opening 11 of the upper case 9 can move up and down smoothly. For this reason, the stem 1 is dipped and applied in a grease solution. Since the top surface 1a of the stem 1 is closed, the grease may not escape,
When the stem 1 in this state is assembled in the switch case 6 composed of the upper case 9 and the lower case 10, the remaining grease adheres to the contact 13a of the movable contact piece 13 or the fixed terminal 14 to cause a contact failure of the switch. There is a point.

The present invention is intended to solve the above problems, and an object of the present invention is to provide a push switch which does not cause a contact failure of the switch even when grease is applied to the stem. is there.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a push switch in which a key top is mounted on the top surface of the stem and the stem is lowered by pressing the key top to switch the contact. In the four corners of the top,
It has a configuration in which a through hole is formed so as to be continuous with the inner surface of the stem.

[Action]

According to the present invention, as described above, the four through-holes connected to the inside of the stem are provided at the four corners of the top surface of the stem. Since it escapes, the grease solution does not remain on the inner surface and the top surface of the stem regardless of the posture of the stem, and the grease does not adhere to the contact of the movable contact piece or the fixed terminal. It won't happen.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

The present invention is the structure of the stem, and the other structure is the same as the structure of the push switch of FIG. 6, so the structure of the stem will be described below.

1 to 3 are explanatory views of a stem showing an embodiment of the present invention, FIG. 1 is a perspective view, FIG. 2 is a top view, and FIG. 3 is a sectional view taken along the line AA of FIG. is there.

The same parts as those in the conventional example shown in FIG. 6 are designated by the same reference numerals.

In the drawing, reference numeral 1 is a box-shaped stem having an open surface 19 on the lower surface, and as shown in FIG. 2, at the four corners of the top surface 1a of the stem 1, one surface 21a is a triangular penetrating connection with the inner surface 1b of the stem 1. A hole 21 is provided, and the through hole 21 is provided with a taper 23 in the direction of the central column 22 as shown in FIG. In addition, 25 is a groove for preventing sink marks at the time of molding the stem 1.

Since the stem 1 of this embodiment is configured as described above, even when the stem 1 is dipped and applied in a solution of grease,
The grease solution escapes from the open surface 19 of the stem 1 and the through hole 21, so that the stem 1 can be placed in any posture.
Since the grease does not remain on the inner surface 1b and the top surface 1a of the stem 1, even when the stem 1 is assembled in the push switch, the grease is fixed on the fixed terminal 14 and the contact 13a of the movable contact piece 13.
Will not adhere to. Therefore, the push switch does not cause a contact failure.

[Effect of device]

According to the present invention, since the through-holes connecting to the inner surface of the stem are provided at the four corners of the top surface of the stem, when the stem is dipped and applied in the grease solution, the grease solution does not change in any posture. Does not remain on the inner or top surface of the stem, so no dust or dirt will adhere to that part.

Therefore, even if the stem is assembled in the push switch, no dust or dirt adheres to the contact and the fixed terminal of the movable contact piece, so that no contact failure occurs.

[Brief description of drawings]

1 to 3 show a stem showing an embodiment of the present invention,
1 is a perspective view, FIG. 2 is a top view, and FIG. 3 is A of FIG.
-A sectional view taken along the line A and Figs. 4 to 6 are explanatory views of a conventional example.
4 and 5 are schematic views showing the basic arrangement of parts of the stem, and FIG. 6 is a sectional view embodying a push switch of the type shown in FIG. 1 ... Stem, 1a ... top surface, 1b ... inside surface, 3 ... key top, 21 ... through hole.

Claims (1)

(57) [Scope of utility model registration request] 1. A push switch in which a key top is placed on the top surface of the stem, and the stem is lowered by pressing the key top to switch contacts, and the inner surface of the stem is provided at four corners of the top surface of the stem. A push-out switch characterized by having a through hole connected to the.