JPH0311773Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of a push button switch attached to a telephone or the like.

[Conventional technology]

Conventionally, for this type of push button switch, due to design requirements, the shape of the key top, which is removably disposed in the switch mounting hole of the operation panel, has been changed to a shape with an inclined side, for example, as shown in Fig. 2. In some cases, it is formed into a right-angled isosceles triangle. That is, reference numeral 1 denotes a push switch disposed on a main board 2 inside the housing, and an inside button 3 is integrally provided in the middle part of the operating shaft 1A, and two opposing side surfaces of the inside button 3 are provided. A cylindrical protrusion 4 is provided on each side. Reference numeral 5 denotes a key top which is disposed so as to be freely protrusive and retractable in the switch mounting hole 7 of the operation panel 6 in correspondence with the push switch 1. This key top 5 is formed into a right isosceles triangle so that it is perpendicular to the oblique side surface 8A. 2 that intersect at 45° with respect to the slanted side 8A.
The upper end surface of the operating shaft 1A is in contact with the lower surface, and the cylindrical projections 4 protruding from the two opposing sides of the inside button 3 are respectively engaged. A pair of legs 9 having vertically long grooves 9A are vertically disposed. Therefore, the key top 8 is rotatable in the left and right directions in the figure using the cylindrical projection 4 as a pivot point, and is configured to push down the operating shaft 1A and operate the button switch 1 when pressed. .

The switch mounting hole 7 is formed in a similar shape that is slightly larger than the key top 5, and is usually similar to the key top 5.
The dimension Δd is set to about 0.1 mm over the entire circumference. For this reason, the key top 5 is
A degree of freedom (with backlash) of 0.1 mm is allowed in the direction orthogonal to A, 8B, and 8C.

[Problem that the invention attempts to solve]

However, in the structure of the push button switch having such a configuration, when the key top 5 is pressed down and moves in a direction parallel to the slanted side surface 8A as shown in FIG. O ₁ is O ₂
The amount of movement d to the position is 0.26mm (however, d=1/
sin θ, θ = 22.5°), therefore, the distance d 1 between the key top 5 and the switch mounting hole ₇ is from 0.1 mm.
Enlarged to 0.24mm.

In other words, the backlash of the key top 5 having the 45° inclined side surface 8A is increased by 2.4 times, and even if it is supported horizontally on the upper surface of the operating shaft 1A, the amount of movement thereof is centered around the projection 4. converted into rotational motion. Therefore, between the switch mounting hole 7 and
becomes larger, which is not aesthetically pleasing. Therefore, the value of the product decreases. In addition, especially if multiple push switches are placed close together, they can be operated at the same time.
Push-button switches configured for ON/OFF operation have had problems, such as the phenomenon of one-sided pressing, resulting in functional failures.

[Means for solving problems]

The present invention has been made in view of the above-mentioned points, and is formed into a triangular shape in plan view, so that at least one side forms an oblique side, and the lower side is spaced apart from the oblique side to other sides. A key top is provided with legs for turning the push switch ON and OFF when a push button is operated, a rotation prevention member is provided on either the lower surface of the key top near the inclined side and the movable member of the push switch, and the rotation prevention member is attached to the other side. By abutting or closely facing each other, the key top is prevented from tilting toward the oblique side.

[Effect]

In the present invention, since a rotation preventing member is provided, the key top is prevented from rotating toward the oblique side.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIGS. 1a and 1b are a plan view and a sectional view showing an embodiment of a push button switch according to the present invention. In the same figure, reference numeral 10 denotes a rotation prevention member which is the gist of this invention. The top end surface of the key top 5 is brought into close proximity to or abuttingly engaged with the lower surface of the key top 5 on the side of the inclined surface 8A. Since the other configurations are the same as those of the conventional example shown in FIG. 2, they are designated by the same reference numerals and their explanations will be omitted.

Thus, according to the push button switch having such a configuration, when the key top 5 is pressed down, even if movement occurs in a direction parallel to the slanted side surface 8A, the amount of movement is limited to the amount that the protrusion 11 moves toward the bottom surface of the key top 5. Since they are in close or abutting engagement, there is no conversion to rotational operation. Therefore, the key top 5 descends vertically while maintaining its horizontal state, and operates the push switch 1. Further, unless rotational movement occurs, the distance between the key top 5 and the switch mounting hole 7 will not become large, and the aesthetic appearance will not be impaired. In addition, especially when applied to a push button switch configured to turn on and off multiple push switches at the same time, the key top does not tilt, so one-sided pressing does not occur and there is no possibility of failure.

In addition, although the above-mentioned embodiment explained the case where the rotation prevention member 10 is provided on the side surface of the inside button 3, the present invention is not limited to this, and the rotation prevention member 10 may be provided on the operating shaft 1A or on the slanted surface 8A side of the key top 5. It may be arranged on the lower surface, and its tip may be brought close to or in contact with the upper surface of the inside button 3.

[Effect of idea]

As explained above, the push button switch according to the present invention is configured to include a rotation prevention member to prevent the key top from rotating toward the slanted side. Even if it moves in the direction, it is not converted into a rotational movement, and it is possible to prevent the distance between the key top and the switch mounting hole from increasing. Therefore, to provide a push button switch which does not cause the phenomenon of one-sided pressing and has a good appearance. Moreover, the structure is simple and manufacturing is easy.

[Brief explanation of the drawing]

Figures 1a and b are a plan view and a sectional view showing an embodiment of the present proposal, Figures 2a and b are a plan view and a sectional view showing an example of a conventional switch, and Figures 3a and b are conventional switches. FIG. 3 is a plan view and a sectional view showing the operating state of the switch. 1...Push switch, 1A...Operation axis, 2
...Main board, 3...Inside button, 4...Cylindrical projection, 5...Key top, 6...Operation panel, 7...Switch mounting hole, 8A...Slanted side,
9... Leg, 10... Rotation prevention member.

Claims (1)

[Scope of utility model registration request] The key top is formed into a triangular shape in plan view, so that at least one side forms an oblique side, and the key top is provided with a leg on the lower surface located away from the oblique side on the other side for turning the push switch ON and OFF when the button is operated. A rotation prevention member is provided on either one of the lower surface of the key top near the slanted side and the movable member of the push switch, and the rotation prevention member is brought into contact with or closely opposed to the other, thereby causing the key top to move toward the slant side. A push button switch characterized by being designed to prevent it from tilting.