Space key (patent 3720801)
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| Country | US |
|---|---|
| Patent number | 3720801 |
| Issued on | 1973 |
| Inventor | Makoto Yanaga |
| Assignee | Alps Electric Co., Ltd. |
| Reference | US3720801 |
A space key or space bar is an invention by Makoto Yanaga in 1972. The main feature was the addition of a lower guide plate and a spring . It consisted of an elongated upper cover, a lower guide plate and a spring in between. A stabilizer rod pivots its ends, so upon depressing the keys any portion of the cover may actuate a switch without further inclination of the guide plate beneath. <ref>US patent 3720801, Makoto Yanaga, "Space key", issued 1973, assigned to Alps Electric Co., Ltd. Tokyo, Japan</ref>
Description[edit | edit source]
Space key
- Inventor: Makoto Yanaga
- Patent number: 3720801
- Filing date: 3 February 1972
- Issue date: 1973
Abstract[edit | edit source]
Background of the invention[edit | edit source]
Referenced by[edit | edit source]
- US patent 3962556, Robert T. Kravchuck, "Keyboard with versatile switch support structures", issued 8 June 1976, assigned to Texas Instruments Inc.
- US patent 4010838, Dewey M. Simms, Jr., "Spacer bar mechanism", issued 8 March 1977, assigned to Burroughs Corporation
- US patent 4384796, Ronald S. Denley, "Keyboard space bar stabilizer", issued 24 May 1983, assigned to Oak Industries Inc.
- US patent 4412754, Daniel R. Sparks, "Space bar for low profile keyboards", issued 1 November 1983, assigned to Becton Dickinson and Company
- US patent 4475832, Walter Wachs, "Parallel guide for push-button switches with multiple buttons", issued 9 October 1984, assigned to Siemens Akiengesellschaft
- US patent 4950093, Wolfgang Ertl, "Support mechanism for multiple-key units", issued 17 July 1989, assigned to Cherry Mikroschalter GmbH
- US patent 5712459, Wolfgang Ziegler, "Push-type switch in particular with extended push component", issued 27 January 1998, assigned to Valeo Borg Instruments GmbH & Co. KG
- US patent 6776547, Dieter Dubois, "Keyboard housing for a keypad of a push-button keyboard", issued 17 August 2004, assigned to Fujitsu Siemans Computers GmbH
Images[edit | edit source]
References[edit | edit source]
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