EP 0189386 A2 19860730 - Apparatus for generating in particular low-frequency sound.
Title (en)
Apparatus for generating in particular low-frequency sound.
Title (de)
Gerät zum Erzeugen insbesondere niederfrequenter Schallschwingungen.
Title (fr)
Appareil pour engendrer un son en particulier de basse fréquence.
Publication
Application
Priority
SE 8500188 A 19850116
Abstract (en)
An apparatus for generating in particular low-frequency sound, comprising a drive unit (10) and an open resonator (11) connected thereto. Said driving unit (10) comprises a housing with a movable member (14) opening and closing an aperture (13) provided in said housing and opening in said resonator (11). The member (14) is operated by means of compressed air whose actuation of said member (14) is controlled by means of a valve (21) activated by electrical pulses from a current source, the frequency of said pulses being manually or automatically controllable. For the removal of soot from furnaces, several apparatuses of this type may be coupled in parallel to a common current source, such that they operate in phase, and a considerable sound amplification is achieved.
IPC 1-7
IPC 8 full level
B06B 1/18 (2006.01); B06B 1/20 (2006.01); B08B 3/12 (2006.01)
CPC (source: EP)
B06B 1/20 (2013.01)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0189386 A2 19860730; EP 0189386 A3 19871119; EP 0189386 B1 19900919; AT E56640 T1 19901015; DE 3674219 D1 19901025; SE 451115 B 19870907; SE 8500188 D0 19850116; SE 8500188 L 19860717; WO 8704953 A1 19870827
DOCDB simple family (application)
EP 86850007 A 19860115; AT 86850007 T 19860115; DE 3674219 T 19860115; SE 8500188 A 19850116; SE 8600060 W 19860214