Patent · US Expired

Sound attenuating box

US4787473A · kind A · utility

26Cited by

7References

26Claims

0Family size

Assignee

FRAUNHOFER-GESELSCHAFT · DE

Inventors

Helmut Fuchs · Hall in Tirol, AT
Ulrich Ackermann · Mainz, DE
Norbert Rambausek · Weil der Stadt, DE

Key dates

Filing date	Nov 13, 1986
Grant date	Nov 29, 1988
Priority date	—
Expiry date	Nov 13, 2006

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16L55/033
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

The propagation of sound in flow channels is attenuated by a sound attenuating box comprised of cell-like chambers each with a bottom, an outer plate and a partition with an opening spaced from the outer plate such that the Helmholtz resonator established by the sub-chamber between the bottom and the partiton as well as by the opening is positively coupled to the outer plate as far as vibrations in the audible range are concerned through air flow through the openings and in the subchamber between partition and outer plate. The chambers share appropriately side walls, bottoms, partitions as well as aperture plates, and outer plates.

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