Touch pad arrangement for signalling arrivals in swimming competitions
US4006364A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 1975 |
| Grant date | Feb 1, 1977 |
| Priority date | — |
| Expiry date | Sep 30, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04F8/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A plurality of contacts, each comprising two electrodes, are arranged beh a plate to be used as a touch pad in a swimming competition timing device. Closing of a contact results in a signal being transmitted from a transistor to control electronic chronometric equipment. The contacts are connected in parallel and are coupled between the emitter and base of the transistor. The voltage across the contact is thereby held to the base-emitter voltage of the transistor, which is below the decomposition voltage of the electrodes. In a second embodiment, contacts are connected to either of two transistors which are in series to act as an "OR" circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.