Piezoelectric knock sensor
US4393688A · kind A · utility
14Cited by
3References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1981 |
| Grant date | Jul 19, 1983 |
| Priority date | — |
| Expiry date | Nov 19, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/02827
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A piezoelectric knock sensor has a case comprising a mounting stud, flexing plate and cover. The flexing plate has a surface provided with a plurality of raised radial ridges. A piezoelectric disk is affixed to the surface with an adhesive and abuts the ridges for improved strain transmission and reliable electrical ground contact. A spring contact further biases the disk against the ridges during assembly bonding of the adhesive; and excess adhesive can flow radially outward between the ridges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.