EP0267541A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

A keyboard

Assignee: SMK Corp

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Filing: 1987-11-05

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Granted: —

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Expires: 2007-11-05

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Abstract

Abstract The present invention relates to a keyboard designed so that the depression of any key top (3) causes a corresponding switch (2) to be opened or closed through a keay stem (10). An upper board (5) of the keyboard is provided with a plural number of key stem guide holes (8) equally distanced in both the directions of X axis and Y axis. In said upper board (5), four slip stopper guide holes (9) are provided symmetrically with respect to each key stem guide hole (8) at a right angle to each other. Furthermore, slip stoppers (13) are provided extending from the bottom of said key top (3), symmetrically with respect to the key stem (10) at 180° to each other. Said key top (3) is available in plural number of sizes, that is, in sizes with the depth of width which is integral-number times the unit size. The key top (3) of the unit size is provided with one key stem (10), whereas the key top of n-times the unit size is provided with n pieces of key stems (10). The keys (1) arranged in the manner described above are designed so that their respective directions can be altered by 90°.

Inventors

👤 Haruo Yoshida

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-10-29 08:54

CPC Classifications

H; H01; H01H; H01H3/00; H01H3/02; H01H3/12; H01H3/122; H01H13/00; H01H13/70; H01H13/702; H01H13/705; H01H11/00; H01H11/0006; H01H2221/00; H01H2221/056; H01H2233/00; H01H2233/03; H01H2233/034; H01H2233/036

Claims Analysis

Total Claims: 4

Claim 1

Independent Claim 147 words

A keyboard, wherein the keys (1) are installed on an upper board (5) so that the depression on the key top (3) of any one of the keys (1) can cause the corresponding key (1) on a lower board (6) to be opened or closed through a key stem (10) which is an integral part of the key (1), featuring key stem guide holes (8) provided on said upper board (5) at equal intervals in both X-axis and Y-axis directions, four slip stopper guide holes (9) provided symmetrically with respect to each key stem guide hole (8) at a right angle to each other and slip stoppers (13) provided to extend from the bottom of the key top (3) symmetrically with respect to said key stem (10) at 180° to each other so that said slip stopper (13) can engage with said slip stopper guide holes (9).

Claim 2

Dependent Claim 147 words

Claim 3

Dependent Claim 52 words

A keyboard, according to claim 1, wherein a square key top (3) with the sides of unit length is provided with one key stem (10) extending from the center of the bottom of the key top (3) and two slip stoppers (13) are provided around the circumference of the key stem (10).

Claim 4

Dependent Claim 68 words

A keyboard, according to claim 1, wherein each key top (3) whose area is n-times the unit area is provided with n pieces of key stems (10), which extend from the bottom of the key top (3) and disposed as equal distances to those of the key stem guide holes (8), and the diameters of these key stem (10) are slightly smaller than that of one key stem.

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