US4066860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pushbutton switch key arrangement for keyboards having indicia
Assignee: Sharp Corp
•
Filing: 1975-09-25
•
Granted: 1978-01-03
•
Expires: 1995-09-25
Abstract
Abstract Pushbutton switch configurations are provided in which one or a plurality of pushbutton switches are formed with integrated bases, actuating springs and key top structures to facilitate fabrication of arrays of such switches in a substantially unitary matrix or in line configuration. In a preferred embodiment a metal base is etched to form spring and key top frame patterns which are press formed into key top and vertically extending supporting spring structures integral with the base plate in a desired matrix or line configuration. Epoxy or similar resin material can then be integrated with the key top frame to complete each pushbutton switch. Suitable operating indicia are press formed or etched in the key top surfaces and contrasted with resin as desired.
Inventors
- 👤 Hiroshi Kawasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:44
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/70; H01H13/7013; H01H13/50; H01H13/52; H01H9/00; H01H9/18; H01H2009/189; H01H2221/00; H01H2221/036; H01H2221/044; H01H2229/00; H01H2229/044; H01H2229/048; H01H2233/00; H01H2233/002; H01H2233/004
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
125 words
A pushbutton switch key structure comprising: a flexible unitary metal frame including a key top defining surface, a key top frame of metal strips integral with and dependent from said top surface; an annular support shoulder integral with the lowermost end of said key top frame; a plurality of actuating leaf spring means integrally affixed at one end to the periphery of said support shoulder and extending downwardly therefrom, and a metal base plate integrally affixed to the lower end of said spring means; and a solid block of molded resin integrated with said key top frame in a desired push-button key configuration; said molded resin block and said key top defining surface being configured to define operating indicia on said pushbutton switch key structure.
Claim 2
Dependent Claim
125 words
A pushbutton switch key structure comprising: a flexible unitary metal frame including a key top defining surface, a key top frame of metal strips integral with and dependent from said top surface; an annular support shoulder integral with the lowermost end of said key top frame; a plurality of actuating leaf spring means integrally affixed at one end to the periphery of said support shoulder and extending downwardly therefrom, and a metal base plate integrally affixed to the lower end of said spring means; and a solid block of molded resin integrated with said key top frame in a desired push-button key configuration; said molded resin block and said key top defining surface being configured to define operating indicia on said pushbutton switch key structure.
Claim 3
Dependent Claim
40 words
The invention defined in claim 1, wherein said metal base plate is common to a plurality of said unitary metal frames, the latter being oriented in a desired keyboard configuration to provide a unitary keyboard array of said switch keys.
Claim 4
Dependent Claim
33 words
The invention defined in claim 2, wherein said indicia is defined by selective removal of said key top surface to provide indicia shaped aperture therein and said resin is visible through said aperture.
Claim 5
Dependent Claim
40 words
The invention defined in claim 2, wherein said resin overlies said key top surface, is substantially opaque and is selectively removed from said key top surface to expose a portion of said surface in the configuration of a desired indicia.
Claim 6
Dependent Claim
32 words
The invention defined in claim 1, wherein said indicia is defined by selective removal of said key top surface to provide indicia shaped aperture therein and said resin visible through said aperture.
Claim 7
Dependent Claim
33 words
The invention defined in claim 1, wherein said resin overlies said key top surface, is substantially opaque and is selectively removed from said key top surface in the configuration of a desired indicia.
References Cited (Backward Citations)
US3612802A
Cited
US3582594A
Cited
US3627927A
Cited
US3856998A
Cited
US3823309A
Cited
US3860771A
Cited
US3932722A
Cited
US3950846A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |