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Publication numberUS1816769 A
Publication typeGrant
Publication dateJul 28, 1931
Filing dateJun 27, 1928
Priority dateJul 27, 1927
Publication numberUS 1816769 A, US 1816769A, US-A-1816769, US1816769 A, US1816769A
InventorsFisk Ernest Thomas
Original AssigneeFisk Ernest Thomas
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Sound suppressing ventilator fitment for wall apertures
US 1816769 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

E. T. FISK 1,816,769

SOUND SUPPRESSING VENTILATOR FITMENT I FOR WALL APERTURES July 28, 1931.

Filed June 27, 1928 F/Gl.

INY em-ro Patented July 28,1931

PATENT OFFICE ERNEST THOMAS FISK, OF SYDNEY, NEW SOUTH WALES, AUSTRALIA BOUND SUPPRESSDTG VENTILATOB FITMENT FOB AIRTUBEQ Application filed June 27, 1928, Serial No.

The object of this invention is to rovide means for facilitatin ventilation t rough apertures in walls of guildings and through window openings whilst limiting transmission of sound in theincoming air. The invention is susce tible of a variety of applications. It ma or instance, be used to admit ventilation t rough an open window while suppressing the transmission of street noises into an apartment. It may be fitted to an existing door or it may be utilized as an auxiliary door to permit ventilation but to impe e transmission of sound vibrations throu h it when the main door hung'in the same mine is left open. Or it may be utilized in a partition between two apartments to facilitate circulation of air between these apartments whilst impeding transmission of v sound from one apartment to the other. The invention comprises a cellular screen or panel having airways through it by which ventilating air-currents can pass, but in which sound waves in the air are absorbed, re-

fracted, or deflected'and are not transmitted as with the ventilation air except in asubstantially damped state.

In the accompanying drawings Fi 1 is a sectional perspective view of a venti ator built into a wall;

Fi 2 is a fragmentary detail section of a vent ator similar to Fig. 1;

Fig. 3 is a fragmentary section of a modification ofthe ventilator; and

Figs. 4 and 5 are detailsectional views of further modifications.

In Figs. 1 and 2 the device is shown as a hollow box 15 having non-aligning perforations 16 through the inner and outer sides of it, and lined with felt or other sound dead-,. .ening material 17. The energy of sound vibrations in the inassing air is largely absorbed in the midliamber 14 and the air passes through the cellular passa es 16 on the inner side of the panel in a su -divided stream and with the sound vibrations abstracted or damped.

Observation of results obtained in the use of such sound chamber panels suggests that they facilitate or at any rate only no li- 60 gibly retard air flow through them w en through which air flow takes place.

288,784, and in Australia July 27, 1927.

wind blows against their external sides. But vibratory or oscillatory conditions in the inpassing air are broken down or absorbed and dissipated particularly when the air passages or the mid cell are lined with felt, soft rubber, or other non-sonorous material.

The functioning of the panels ma be exalted so that they will more complete check noise transmission without toofar limiting freedom for circulation of ventilation by fitting oneor more perforate septa across the mid cell, and alsoby disposin the perforations in the inner septum and t e anel sides staggered or out of alignment ei er by displacing them laterally or by varying their direction.

surfaces with which"; the incoming air contacts', are constructed of or lined with felt or other non-resonating material in which sound waves will be absorbed, but useful results are 'still attained with structures of metal, glass, artificial stoneware or other hard material by reason of the disposition of the surfaces to deflect, reflect, and baflle sound vibrations.

Fig. 3 illustrates a form of the invention in which the innerand outer walls 18-19 of a hollow box are perforated at 20 and a perforate septum 21 1S fitted in the chamber 22. This view .ggests a construction in stone ware or like nis -erial, unlined.

A screen of louv e type is efiicient so long as the intervening louvre slats are disposed so that they operate to break upthe wave front, the air vibrations carried past them being broken down by absorption or deflection M in chambers within the strugturfi a screen is shown in Fig. 4, in which the encasement 23 is fitted with oppositely p tched louvres 24 in the respective sides of it. septum 25 may be, fitted in the chamber 26 between the frontal and rear side louvres. This semptum may be a perforate sheet of non-sonorous material, or it may be a sheet of cloth or felt ap ropriatel perforated Fig. 5 shows anot er modi cation in which The highest efficiency is attained when the the air currents and to procure damping of a. perforate plate 30 forms one side of the panel, and louvres 31 the other side of it, the septum being formed by reveraely pitched louvres 32.

What I claim as my invention and desire to secure by Letters Patent is A sound damping ventilating sereen hav- 7 ing perforated sides including sound dampemng material forming the walls of the perforations,said screen having an air chamber between the perforated sides, and a perforate septum in said chamber.

In testimony whereof I afiix my si ature.

ERNEST THOMAS F 18K

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2470375 *Feb 13, 1946May 17, 1949Schwartzberg Alter LVentilator
US2502016 *Nov 30, 1943Mar 28, 1950Rca CorpDiffraction type sound absorber
US2502020 *Jan 26, 1945Mar 28, 1950Rca CorpDiffraction type sound absorber with fiber glass walls
US2565122 *Mar 19, 1947Aug 21, 1951Air Rectifiers IncVentilating wall block
US2611310 *May 27, 1947Sep 23, 1952Air Rectifiers IncVentilating wall block
US2672864 *Jul 18, 1951Mar 23, 1954Frank MakaraAudio mask
US2704504 *Feb 2, 1950Mar 22, 1955Arthur O WilkeningSound trap and air transfer device
US2849077 *Mar 4, 1954Aug 26, 1958Courtland HastingsNoise suppressing screen
US2966954 *Jul 11, 1957Jan 3, 1961Celotex CorpAcoustical correction element
US4660676 *Mar 12, 1986Apr 28, 1987The United States Of America As Represented By The Secretary Of The Air ForceDuctless acoustical noise attenuator
US8641494 *May 9, 2005Feb 4, 2014Silenceair International Pty LimitedVentilation device and frame system
US20070187163 *Apr 4, 2006Aug 16, 2007Deere And CompanyNoise reducing side shields
US20080190711 *Jun 30, 2004Aug 14, 2008Patrick William PElevator Cab Ceiling with Dissipative Ventilation Channel
US20090011696 *May 9, 2005Jan 8, 2009Christopher James MatthewsVentilation device and frame system
Classifications
U.S. Classification454/254, 454/906, 181/224
International ClassificationE06B7/08
Cooperative ClassificationE06B7/08, Y10S454/906
European ClassificationE06B7/08