Bimetal controlled actuator
US4184633A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1977 |
| Grant date | Jan 22, 1980 |
| Priority date | — |
| Expiry date | Sep 15, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15C3/14
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A pressure transducer is disclosed which produces a variable fluid pressure level in correspondence with the level of a varying electrical signal. The particular application of the pressure transducer disclosed is for a vacuum modulator for producing a variable level vacuum pressure for operating an actuator utilized to position a blend air door in an automatic temperature control system for automotive passenger compartments. The pressure variation is accomplished by controlled communication of either a low pressure or a high pressure source with an interior chamber of the transducer housing, such controlled communication being produced by a pair of heated bimetal actuator devices, each including a bimetal arm which is normally biased to seal the respective inlet port associated with each of the low pressure and high pressure sources. One or the other of the bimetal arms is heated if the pressure level differs from the level corresponding to the electrical signal value by means of a bimetal heater circuit associated with each bimetal arm with the varying electrical signal to be transduced causing activation of the heater current in one or the other respective bimetal heater circuit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.