US1587587A - Sound funnel for radiotelephony or other sound reproduction - Google Patents

Sound funnel for radiotelephony or other sound reproduction Download PDF

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Publication number
US1587587A
US1587587A US5024A US502425A US1587587A US 1587587 A US1587587 A US 1587587A US 5024 A US5024 A US 5024A US 502425 A US502425 A US 502425A US 1587587 A US1587587 A US 1587587A
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Prior art keywords
sound
funnel
radiotelephony
reproduction
strips
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US5024A
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Jorgensen Georg Karlo Villy
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
    • G10K11/025—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators horns for impedance matching

Definitions

  • the invention relates to a sound-funnel for radio-telephony or other sound-reproduction.
  • the distinguishing feature of the invention is that the sound-funnel is formed of two layers of wood with an interposed helically wound steel wire (piano wire) by means of which the parts composing the inner layer of wood are bound tightly together.
  • piano wire interposed helically wound steel wire
  • FIG. 1 shows vation with the outer removed, and I Fig. 2 a section along the line II--II in Fig. 1 to a larger scale.
  • the sound-funnel is layer of thin strips a, for instance eight strips, in such a manner that the soundfunnel will be of octagonal cross-section. Bending of the wooden strips and gluing together of their edges is effected in known manner by use of a core corresponding to the shape of the sound-funnel desired.
  • the funnel thus formed is wrapped with a steel wire (piano wire) 7), the winding beginning at the narrow end of the funnel and being continued with one single unbroken wire laid helically with suitable pitch throughout the entire specificationthe sound-funnel in side elelayer of wood partly formed by an inner BADIOTELEPHONY OR OTHER SOUND REPRODUCTION.
  • the steel wire is wound quite tightly about the funnel in such a manner 42s that it cuts into the edges of the funnel, whereby it is held securely in position on the funnel.
  • an outer layer of thin wooden strips 0 suitably of the same thickness as 45 the inner layer of strips a.
  • the strips 0 are attached by gluing to the inner layer.
  • the same manufacturing process may also be used in other fields where boxshaped, tubular or otherwise shaped wooden articles are produced.
  • Sound-funnel for radiotelephony and other sound reproduction comprising an inner and an outer layer of wood, metal wire wrapped around said inner layer, and means for connecting said outer layer to the inner layer.
  • Sound-funnel for radiotelephony and other sound reproduction comprising an inner and an outer layer of wood, and metal wire wrapped around said inner layer, the outer layer being connected with the inner layer by means of glue.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Laminated Bodies (AREA)
  • Building Environments (AREA)

Description

June 8 1926. 1,587,587
G. K. V. JURGENSEN SOUND FUNNEL FOR RADIO TELEPHONY OR OTHER SOUND REPRODUC'IHON Filed Jan; 27, 1925 INVENTOK: G Kar/o V/l/ 4E7 ease/7 ATTOR NET Patented June 8, 1926.
UNITED STATES PATENT OFFICE.
GEOBG KABLO VILLY JORGENSEN, 0F COPENHAGEN, DENMARK.
SOUND FUNNEL FOB Application filed January 27, 1925,
The invention relates to a sound-funnel for radio-telephony or other sound-reproduction. The distinguishing feature of the invention is that the sound-funnel is formed of two layers of wood with an interposed helically wound steel wire (piano wire) by means of which the parts composing the inner layer of wood are bound tightly together. Hereby the advantages are attained partly that the sound funnel is reinforced so as to become more solid and durable, partly that the reproduction of sound becomes exceedingly pure, clear and distinct and especially free of all disturbing secondary sounds.
In the drawing accompanying and form ing part of this Fig. 1 shows vation with the outer removed, and I Fig. 2 a section along the line II--II in Fig. 1 to a larger scale.
The sound-funnel is layer of thin strips a, for instance eight strips, in such a manner that the soundfunnel will be of octagonal cross-section. Bending of the wooden strips and gluing together of their edges is effected in known manner by use of a core corresponding to the shape of the sound-funnel desired. After bending and luing of the inner layer of strips has been nished the funnel thus formed is wrapped with a steel wire (piano wire) 7), the winding beginning at the narrow end of the funnel and being continued with one single unbroken wire laid helically with suitable pitch throughout the entire specificationthe sound-funnel in side elelayer of wood partly formed by an inner BADIOTELEPHONY OR OTHER SOUND REPRODUCTION.
Serial No. 5,024, and in Denmark December 2, 1924.
length of the funnel clear up to the funnel mouth. The steel wire is wound quite tightly about the funnel in such a manner 42s that it cuts into the edges of the funnel, whereby it is held securely in position on the funnel. When the winding operation is finished, an outer layer of thin wooden strips 0, suitably of the same thickness as 45 the inner layer of strips a. The strips 0 are attached by gluing to the inner layer.
Experiments have shown that the wrapping of fine steel wire about the inner funnel portion causes the sound reproduction 5 to be far better than if no such wrapping were provided.
The same manufacturing process may also be used in other fields where boxshaped, tubular or otherwise shaped wooden articles are produced.
Having thus described my what I claim is 1. Sound-funnel for radiotelephony and other sound reproduction, comprising an inner and an outer layer of wood, metal wire wrapped around said inner layer, and means for connecting said outer layer to the inner layer.
2. Sound-funnel for radiotelephony and other sound reproduction, comprising an inner and an outer layer of wood, and metal wire wrapped around said inner layer, the outer layer being connected with the inner layer by means of glue.
In testimony whereof I have signed my name to this specification.
invention,
GEORG KARLO VlLLY JORGENSEN.
US5024A 1924-12-02 1925-01-27 Sound funnel for radiotelephony or other sound reproduction Expired - Lifetime US1587587A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK244031X 1924-12-02

Publications (1)

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US1587587A true US1587587A (en) 1926-06-08

Family

ID=8150170

Family Applications (1)

Application Number Title Priority Date Filing Date
US5024A Expired - Lifetime US1587587A (en) 1924-12-02 1925-01-27 Sound funnel for radiotelephony or other sound reproduction

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US (1) US1587587A (en)
CH (1) CH112424A (en)
GB (1) GB244031A (en)

Also Published As

Publication number Publication date
GB244031A (en) 1926-03-04
CH112424A (en) 1925-11-02

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