Key switch device
June 24, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References Re30435 Push button body for a push-button switch providing snap-action of the switch Tactile layer having hinged dome Double-domed elastomeric keyboard element Rubber-made covering member for push button switches Keyboard switch Conductive elastomeric ink composition Keyboard switch Elastomeric push button return element for providing enhanced tactile feedback Key switch InventorAssigneeApplicationNo. 07/211255 filed on 06/24/1988US Classes:200/513Specific dome shapeExaminersPrimary: Scott, J. R.Attorney, Agent or FirmInternational ClassH01H 13/52 (20060101)Foreign Application Priority Data1987-06-30 JPAbstractA rubber spring is disposed on a base on which are mounted fixed electrodes. The rubber spring includes first and second cup sections. The first cup section is in the form of an inverted cup, whose top portion is smaller in diameter than the bottom portion thereof, and is adapted to be bent by a force applied thereto from above and to produce a resilient restoring force corresponding to the size of such deflection. The second cup section, which is located inside the first cup section, has a U-shaped longitudinal section and is adapted to be bent by a force applied thereto from above and to produce a resilient restoring force corresponding to such deflection. Thin-walled portions are formed at the bent portions of the first and second cup sections. A center projection protrudes upward from the center of the second cup section. The top face of the center projection is situated below the upper surface of the support seat. An electric conductor member is disposed on the central part of the underside of the second cup section, so as to face the fixed electrodes. | |
