Patent · US Expired

Warning tone transmitter

US6774537B2 · kind B2 · utility

0Cited by

9References

12Claims

0Family size

Assignee

DBT Automation GmbH · DE

Inventors

Jens Titschert · Grafenau, DE
Jorg Wagner · Königsee, DE
Emmanuel Charruau · Grafenau, DE
Helmut Hermann · Bochum, DE

Key dates

Filing date	Sep 30, 2002
Grant date	Aug 10, 2004
Priority date	—
Expiry date	Dec 28, 2022

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB06B2201/70
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The warning tone transmitter (10) according to the invention has a piezoelectric horn element (12) with two input connectors (29, 30) for the application of the supply voltage at a determined frequency and has a circuit arrangement (14) fed from the current supply, which generates the supply voltage. In order to be able to receive confirmation that the horn signal is actually generated by the warning tone transmitter (10) and in order to be able more easily to calibrate the warning tone transmitter (10) such that it is driven at its resonant frequency the piezoelectric horn element (12) has an additional output connector (34), which, when the horn element (12) is fed with the supply voltage, generates an answering signal taken to the circuit arrangement (14) if the piezoelement is actually oscillating. The magnitude of the answering signal is a value for the sound volume of the warning tone transmitter (10).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.