Pressure transducer
US4369659A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 11, 1980 |
| Grant date | Jan 25, 1983 |
| Priority date | — |
| Expiry date | Aug 11, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L9/0002
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The melt pressure transducer is preferably for use in pressure measurements associated with an injection molding machine, and is designed to be mounted inside a mold to measure cavity pressure directly. In addition to being small in size, the transducer is also adapted for high cycle life. The transducer utilizes an internal filler rod for temperature compensation and, also, to reduce liquid volume rather than a capillary. The strain gauges are secured to opposing flats of the housing to provide a pressure-ranged section. The housing is in the form of a thick-walled cylinder with the flats forming the sensitive areas. Further, a unique fill and seal technique is described for charging the transducer and, at the same time, pre-stressing the coupling diaphragm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.