Title:
SILENCING DEVICE FOR EMISSION SOUND AT DUCT OUTLET
Document Type and Number:
Japanese Patent JPH04295116
Kind Code:
A
Abstract:
PURPOSE:To improve silencing effect by oscillating a diaphragm of a speaker for eliminating sound to a low frequency range faithfully. CONSTITUTION:A piston rod 5 with an diaphragm 23 fixed is inserted in the cylinder 4 of a body 3 provided at the back of a speaker frame 1 as a speaker for absorbing ssound, and is supported by a hydrostatic bearing 9 to use a hydraulic driving speaker 42 by a hydralulic controller 17 for hydraulic feed control into two cylinder chambers 7, 8 in front and rear, formed at a partition part 6 in the middle of the piston rod.
Inventors:
ASAMI HIDEJI
KITAYAMA HITOSHI
KONDO AKINOBU
YAMAMOTO MASATO
KITAYAMA HITOSHI
KONDO AKINOBU
YAMAMOTO MASATO
Application Number:
JP5904891A
Publication Date:
October 20, 1992
Filing Date:
March 22, 1991
Export Citation:
Assignee:
ISHIKAWAJIMA HARIMA HEAVY IND
ISHIKAWAJIMA SYST TECH
ISHIKAWAJIMA SYST TECH
International Classes:
F01N1/00; G10K11/16; G10K11/178; (IPC1-7): F01N1/00; G10K11/16
Attorney, Agent or Firm:
Nobuo Kinutani (1 outside)
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