Diaphragm pressure ring for tone generators
US4387788A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1982 |
| Grant date | Jun 14, 1983 |
| Priority date | — |
| Expiry date | Jan 21, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R11/14
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A molded pressure ring adapted primarily for holding the peripheral marginal portion of a diaphragm in a tone generator under uniform light pressure so that the tone does not change significantly under normal changes in ambient conditions of temperature and pressure; more particularly the ring comprises an outer annular body having circumferentially equi-spaced, radially inwardly extending, generally U-shaped, independently movable, flexible and resilient cantilevers provided at the free ends thereof with pressure applicators arranged to engage and hold the diaphragm under pressure exerted by torsion-stressed portions of the cantilevers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.