Electronic programmable thermostat
US4669654A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 1986 |
| Grant date | Jun 2, 1987 |
| Priority date | — |
| Expiry date | Feb 18, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/1904
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An electronic programmable thermostat for the control of a furnace or air conditioner is useful as a replacement for a conventional non-programmable thermostat and mounts on the non-programmable thermostat's wall plate to achieve support, electrical connection with the load and power supply, and the use of certain manual controls supported on the wall plate. The programmable thermostat employs a circular printed circuit board supporting its electronic components, which include a potentiometer for operator adjustment of desired temperature. A flat circular knob supported on the potentiometer shaft and an annular bezel cover the thermostat and allow access to the manual controls supported on the wall plate. The potentiometer and a temperature sensing thermistor control the frequency of a pulse generator which provides input to a counter. The resulting digital signal is compared with a digital signal generated under control of a clock and manually actuable programming switches, to generate an output control signal for the load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.