JP2522513Y2 - Push button for switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a push button for a switch, and more particularly to a push button for a switch used for a push button dial of a public telephone installed outdoors.

[Conventional technology]

Devices that are used by an unspecified number of people, such as public telephones, are often damaged by mischief. In particular, dial devices whose front surface is made of metal as a measure against mischief caused by cigarette fire or lighter fire Used.

In particular, the push button of the dial of the push button telephone has a head protruding from the front surface of the dial plate and is easily damaged, so the push button itself is made of metal or its surface is coated with a metal material. The numbers and symbols required for the dial are printed on the metal surface.

[Problems to be solved by the invention]

However, the symbol printed on such a metal push button is shown in black on the metal surface and the contrast is not always good.

While such payphones do not cause any particular inconvenience for ordinary users with ordinary vision,
It is difficult for persons with visual impairment such as low vision or color blindness to distinguish the numeric symbols on the dial surface, which limits the use of public telephones.

Symbol recognition for a visually impaired person such as amblyopia and color blindness requires the use of black and white and complementary colors, and it is difficult to apply such coloring to a push button on a metal surface. When the button material is made of plastics, it can be colored arbitrarily and is used for indoor telephones and various keyboards. However, public telephones and the like have problems in heat resistance and scratch resistance for the above-mentioned reasons. Therefore, there has been a demand for a push button that has sufficient heat resistance and scratch resistance, and that can be freely colored and molded, for a device that may be damaged by heat or a scratch.

[Means for solving the problem]

The present invention has solved the above problem by using ceramics as the material of the push button.

That is, according to the present invention, the head is provided in the hole of the panel for attaching the push button in a loose fit state, and the head protruding from the hole is formed to be slightly larger than the diameter of the head by being connected to the head. A flange portion locked by a peripheral portion, a contact pressing portion that extends in a bar shape from the back surface of the head and presses the operating contact by contacting the tip with the operating contact, and around a rod-shaped portion of the contact pressing portion. A switch push button made of a ceramic sintered body integrally formed with a groove portion for accommodating a return spring for providing a return force against the pressing force provided on the head surface, at least on the head surface, Any one of letters, numbers, symbols and colors is printed thereon, and a transparent glaze printing layer is further provided thereon.

〔Example〕

FIG. 1 is a longitudinal sectional view of an example of a switch push button of the present invention, and FIG. 2 is a partially enlarged sectional view of the head surface thereof.
FIG. 3 is a horizontal sectional view of an example of a dial device using the push button of the present invention as a push button dial device of a public telephone.

The shape of the push button 1 shown in FIG. 1 has a shape to be used for the switch mechanism shown in FIG. 3, and is adapted to the shape by the switch mechanism, particularly the return spring mechanism.

FIG. 2 is a partially enlarged sectional view showing the structure of the surface portion 2 of the present invention.
It is. The ceramic molded body 3 is formed by molding a ceramic raw material into a shape of a push button and firing it at a required temperature.

On the surface of the ceramic molded body 3, in particular, on the head surface 2, printing for identifying button functions (numbers such as 0, 1, 2,...,
Symbols such as # and *) 4 are printed. Since the ceramic molded body is generally white, letters, numerals, symbols, and the like to be printed are preferably black.

When the buttons are color-coded, the print 4 is applied to the entire outer surface of the ceramic molded body or the surface of the head, and if an identification symbol is required, it is further printed thereon. In this case, the color of the identification symbol printed on the application color is such that a visually impaired person such as amblyopia can be recognized.
It is preferable to select a color that is complementary to the ground color.

The printing 4 of the identification symbol uses a bakeable pigment,
It is printed after printing.

The push button 1 on which the identification symbol is baked is coated with a transparent glaze 5 on the surface, and after the glaze 5 is fixed by baking again, it is attached to a switch mechanism required as a push button of the present invention.

FIG. 3 is a horizontal sectional view showing an example of a dial surface of the push button type telephone. The push button 1 of the present invention fitted so as not to be detached from the panel 11 is separated from the operating contact 13 by a spring 12. When the head of the push button is pressed in accordance with the symbol printed on the head of the push button 1, the push button 1 is lowered against the spring 12 and presses the operating contact. By this pressing contact, a contact mechanism attached to the button or a contact mechanism provided inside the operating contact is operated to connect an operation switch of the function shown on the button, and when the push button is released, the button is actuated by the spring 12. The switch is turned off from the operating contact.

[Effect of the invention]

The present invention is configured as described above. As a push button for a switch, it is a push button made of a rigid material called a ceramic sintered body, while accommodating a flange portion, a contact pressing portion extending in a bar shape, and a return spring. Of the push button is loosely fitted to the push button mounting panel because it is formed in one piece and is loosely fitted in the hole of the push button mounting panel. There is no danger of failure such as the push button not moving, and it is durable and can withstand long-term use. Moreover, it is excellent in fire resistance and scratch resistance, and is not damaged by mischief when used for a push-button dial of a public telephone.

Further, by baking paint or printing, it is possible to perform any coloring and printing, and it is possible to provide a public telephone with good dial discrimination that can be used even by a visually impaired person such as color weakness or color blindness. It is made of ceramic and glazed, so it is not easily stained, it is easy to clean, and maintenance of beautiful appearance is easy.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of an example of a switch push button according to the present invention, and FIG. 2 is a partially enlarged sectional view of a head surface thereof. FIG. 3 is a horizontal sectional view of an example of a dial device using the push button of the present invention as a push button dial device of a public telephone. 1 ... push button, 2 ... surface part, 3 ... ceramic molded body, 4 ... printing, 5 ... glaze, 11 ... panel, 12 ...
... Spring, 13 ... Contact for operation. A: flange portion, B: contact pressing portion, C: groove portion.

Claims (1)

(57) [Scope of request for utility model registration] 1. A head (1) which is provided in a hole of a push button mounting panel (11) in a loose fit state and protrudes from the hole,
A flange portion (A) connected to the head portion, formed slightly larger than the diameter of the head portion, and locked by a peripheral portion of the hole of the panel;
The operating contact extends from the back of the head into a rod and the tip is a contact (13)
Contact pressing portion (B) for pressing the operating contact by contacting with the contact
A ceramic sintered body integrally formed with a groove (C) for accommodating a return spring (12) provided around the rod-shaped portion of the contact pressing portion and providing a return force against the pressing force. And at least one of letters, numbers, symbols and colors is baked on the surface of the head, and further has a baked layer of transparent glaze (5) thereon. A push button for a switch, characterized in that: