US1791173A

US1791173A - Auditorium loud-speaker

Info

Publication number: US1791173A
Application number: US405741A
Authority: US
Inventors: Thorington Fletcher
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-11-08
Filing date: 1929-11-08
Publication date: 1931-02-03
Anticipated expiration: 1948-02-03

Description

Feb. 3, 1931. F. THORINGTON AUDITORIUM LOUD SPEAKER Filed Nov.

8, 1929 2 Sheets-Sheet l w W M r 1 2 0 Y 442 z W M r i, T M M n 0 A m a w m r m y w w F Feb. 3, 1931. F. THORINGTON 1,791,173

AUDI TORIUM LOUD SPEAKER Filed Nov. 8, 1929 2 Sheets-Sheet 2 INVENTOR. Fl ETC/IE7? T W Patented Feb. 3, 1931 UNITED STATES FLETCHER THORINGTON, OF BIRMINGHAM, ALABAMA AUDITORIUM LOUD-SPEAKER Application filed November 8, 1929. Serial No. 405,741.

The present invention relates to an auditorium loud speaker.

One of the objects of the invention is to design a loud speaker which-will require a minimum amount of space and produce a maximum response.

Another object of the invention is to construct a loudspeaker which will reproduce both low and high frequencies.

And a still further object of my invention is to construct a speaker having a lurality of speaker units which gives the e ect of a single speaker having a single speaker unit. In carrying my invention into effect I employ an outer horn and an adjustable inner horn which acts as a bafiie, the outer horn being provided with a sound directing member projecting into the inner horn. On the outer horn there are a plurality of speaker units arranged to direct part of the sound waves into the open space and part into the inner horn.

The inner horn acts as a bafile and provides a path through the air stopping the air circulation sufliciently to allow the loud speaker to reproduce the low tones and at the same time to permit the high irequencies to be directed directly from the speaker unit into the atmosphere.

The features of my invention which I consider novel are pointed out with particularity in the appended claims. The invention itself, however, both as to its arrangement and method of operation together with further objects and advantages thereof'will best be understood by reference to the following description taken in connection with the accompanying drawings in which Figure 1 is a front elevational view of a loud speaker constructed in accordance with the invention.

Figure 2 is a vertical sectional view on line 2-2 of Figure 1, i p f Figure 3 is a vertical sectional view on line 33 of Figure 2,

Figure 4 is .a fragmentary sectional view of one of the loud speaker units,

Figure 5 is a fra mentary view of the adj usting rods of the inner horn,

Figure 6 is a front elevational view of a modification of the invention,

Figure 7 is a horizontal sectional view of line 77 of Figure 6,

Figure 8 is a vertical sectional view on line 8-8 of Figure 7.

Referring to the accompanying drawings, an outer truncated pyramidically shaped horn 10 has arranged on its open end a pair of spacedly disposed adjustable rods 12 and 14 which are mounted on L-

shaped attachingme'mbers

16 and 18 disposed on the upper and lower inner surfaces of the horn. An inner horn 20 of similar shape to the outer horn is fixed to the adjustable rods 12 and 14 by means of screws 22 and projects into the outer horn. The outer horn has an inner member 24 which projects into the inner horn leaving suflicient space between the inner surface of the inner horn to I permit sound waves to pass from the inner horn into the outer horn. A plurality of speaker units 26 which are provided with a number of apertures 28 arranged in the outer surface of its cone are mounted on the inner horn so that the sound waves may be directed directly. from the cone of the speaker units 1 into the inner horn and also through the apertures 28 of the speaker units directly into the atmosphere. The rods 12 and 14 are adapted to slide horizontally in grooves 32 in the L-shaped'members 16 and 18 to permit a horizontal adjustment of the inner horn and the

rods

16 and 18 are provided with nuts 30 to permit a vertical adjustment of the inner horn. While the outer horn is shown as being pyramidically shaped it is obvious that either the inner or outer horn may be cone or any desired shape.

The speaker units may be of any of the desired standard speakers and while only two speaker units are shown on the inner horn it is obvious that any number may be arranged thereon without departing from the scope and spirit of the invention.

Part of the sound waves from the speaker unit are directed from the speaker units 26 v into the inner horn 20 which acts as a baffleagainstthe projection 24 into the outer horn l0 and out into the atmosphere. The

' apertures 28 arranged in the' cond shaped horn of the speaker units 526 permit the higher frequencies to be directed into the atmosphere directly without the necessity of ex panding into the inner horn and through the outer horn.

Referring to the modification illustrated in Figures 63,-? and 8, a transversely curved j 36 is attached.

the inner horn 36. These units have apertures 42 in which cone surfaces are fixedly mounted in the inner horn so that part of the sound is directed from the apertures 412 into the inner horn 36 against the directing member 38 and out through the outer horn into the atmosphere and also directly to the atmosphere from apertures in the cone metal mounting of the speaker units.

While I have described my invention with particular reference to the structure shown in the accompanying drawings I do not wish to be limited to the use of this particular structure-shown and described, as it will be apparent that other structures may be used without departing from the scope of my invention as set forth in the appended claims. What I claim as new and desire to secure by I Letters Patent of the United States is:

v 1. A loud speaker comprising an outer horn, an inner horn centrally disposed in said outer horn, a sound deflecting member 111 said outer horn projecting into said inner horn and being spacedly disposed therefrom, a plurality of speaker iinit's in said inner horn, said speaker units being provided with means for directing part of the sound into said inner horn and a part of the sound directly into the atmosphere.

2. A loud speaker comprising an outer horn, an inner horn centrally disposed in said outer horn, a sound deflecting member in said outer horn projecting intosaid inner-horn and being spacedly disposed therefrom, a plurality of speaker units-in said inner horn, said speaker units being provided with meams for directingpart-of the sound into said inner horn and a part of the sound directly into the atmosphere, and means for horizontally and vertically adjusting said inner horn relative to said outer horn. j

3. A loud speaker comprising an outer horn, an inner horn of the same shape as said outer horn suspended said outer horn andspacedly disposed therefrom, a sound defleeting member in said inner horn, a plurality of speaker units arranged in said inner horn, said. speaker units being provided with a plurality of apertures for emitting a por-.

tion of the sound waves directly from said 4 speaker. units directly into the atmosphere and a single aperture for directing a portion of the sound waves into the inner horn.

i. A loud speaker comprising a truncated pyramidically shaped outer horn having an inwardly pyramidically shaped depression horn of the speaker into the inner horn and a portion of the sound is emitted directly from the apertures in said cones to the atmosphere.

5. A loud speaker comprising an outer horn, an inner horn disposed in said outer horn, a sound deflecting member in said outer horn projecting into said inner horn and being spacedly disposed therefrom, a plurality of speaker units in said inner horn having cone shaped horn members, said cone .shaped'horn members having a plurality of apertures therein and being arranged in said inner horn so that a fportion of the souIid is emitted from said plurality of apertures into the inner horn and aportion of the sound emitted directly from the major opening of the horn into the atmosphere.

6. A loud speaker comprising an outer horn, an inner horn disposed in said outer horn, a sound deflecting member in said outer horn projecting into said inner horn for defleeting the sound waves from said inner horn' into said outerhorn, a plurality of speaker ,units arranged in said inner horn having a plurality of sound emitting apertures therein, said speaker units being arranged in said inner horn so that a portion of the sound is emitted from saidspeaker units directly into the atmosphere and a portion is directed into the inner horn against the deflecting member and into the outer horn:

- 7. A loud speaker comprising an outer horn, an inner'horn disposed in said outer horn, a sound deflecting member in said outer horn projecting into said 1 inner horn and a plurality of speaker units arranged in said inner horn, said speaker units having a major sound emitting aperture therein and a pluraling arranged in said inner horn so that the sound emitted from said minor apertures is directed into the inner horn and the sound emitted from said major aperture is emitted directly to the atmosphere.

8. An auditorium loud speaker comprising an outer horn, an inner horn disposed in i said outer horn, a sound deflecting member in said outer horn projecting into said outer horn and being spacedly disposed therefrom, a plurality of speaker units arranged in said inner horn, said speakers being provided with sound emitting means for directing apor- I tion of the sound into said inner horn and a portion of the sound into the atmosphere.

9. An auditorium loud speaker comprising an outer horn, an inner horn disposed in said outer horn, a sound deflecting member in said outer horn projecting into said inner horn and being spacedly disposed therefrom, a plurality of speaker units arran d in said inner horn, said speaker units being provided with sound emitting means for directing a portion of the sound into said inner horn and a portion of the sound into the atmosphere, and means for longitudinally adjusting said inner horn relative to said outer horn. p

' 10. An auditorium loud speaker comprising an outer horn, an inner horn disposed in said outer horn, a sound deflecting member in said outer horn projecting into said inner 3b horn and being spacedly disposed therefrom, a plurality of speaker units arranged in said inner horn, said speaker units being provided with sound emitting means for directing a portion of the sound into said inner horn and a portion of the sound into the atmosphere,

and means for adjusting said inner horn relatively to said outer horn. k

In testimony whereof I aflix my signature.

FLETCHER THORINGTON.