Pushbutton structure of keyboard that generates pulse-like reaction when depressed
US6375372B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 13, 2001 |
| Grant date | Apr 23, 2002 |
| Priority date | — |
| Expiry date | Feb 13, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H3/125
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A pushbutton of a keyboard includes a cap supported on a base board by a linkage comprising first and second links pivoted together whereby the cap is movable from a released to a depressed positions when depressed. Each link has upper and lower pivots respectively connected to the cap and the base board. The links have two side bars connected between the upper and lower pivots thereof. A cross bar is connected between the side bars of the first link. A resilient arm extends from the cross bar and forms a nub on a free end thereof. A rigid arm extends from one side bar of the second link and has a wedge section having first and second surfaces forming an apex therebetween. The nub of the resilient arm is in contact engagement with the first surface when the cap is at the released position. The nub slides over the apex to reach and engage the second surface when the cap is depressed and moved to the depressed position whereby a pulse-like reaction is generated. Two spring arms extend from the base board with free ends thereof receivingly engaging recesses defined in corresponding side bars for biasing the cap toward the released position. The spring arms deform when the cap is depre…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.