US1648763A

US1648763A - Amplifier

Info

Publication number: US1648763A
Application number: US127638A
Authority: US
Inventors: Reuben H A Englund
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-08-06
Filing date: 1926-08-06
Publication date: 1927-11-08
Anticipated expiration: 1944-11-08

Description

1,648,763 R. H. A ENGLUND 1 AMPLIFIER Filed $12.6. 192s 2 Sheets-Sheet 1 p v I 21/ 1 I A TTORNEYS.

Nov. 8, 1927.

R. H. A. ENGLUND AI'WPLIFIER Filed Aug. 6. 1926 2 Sheets-Sheet 2 INVENTOR. R. H-. H- ENELUND A TTORNEYS.

Patented Nov. 8, 1927.

UNITED STATES,

REUBEN H. A. ENGLUND, or KENT, WASHINGTON.

AMPLIFIER.

Application filed August 6, 1926. Serial No. 127,638.

This invention relates to improvements in amplifiers and has particular reference to a horn amplifier.

The principal object of this invention is to provide means whereby a reproduclng unit such as an ear phone or palr of ear phones or similar device, may be attached to the horn so that the volume delivered by the unit will be amplified.

Another object is to produce a horn of this character having an increasing crosssectional area throughout its length.

A further object is to produce a horn wherein an elongated tone chamber may be formed in the minimum amount of space.

Other objects and advantages will be ap parent during the course of the following description.

In the accompanying drawings forming a part of this specification and in which like numerals are employed to designate hke parts throughout the same.

Figure I is a perspective view of my horn,

Figure II is a Vertical cross-sectlon of my horn,

Figure III is a cross-section taken on the line 33 of Figure II, and

Figure IV is a perspective view of one of the wedge elements.

It is a well known fact that in amplifying.

it is essential to use a tone chamber of considerable length. This lengthy tone chamber heretofore has resulted in the production.

of horns which were unsightly and therefore objectionable in many instances.

I have produced a horn wherein the maxi mum length of the tone chamber has been maintained and the space required has been reduced.

In the accompanying drawings wherein for the purpose of illustration is shown a preferred embodiment of my invention, the

numeral 5 designates a cabinet having a back member 7 and the end 19 of the unit attachment is a rubber connector 12. In order to properly secure the unit attachment 19 in the bore 8, I provide wedges 13 and 14 one of which is shown in Figure IV. I

Secured to the tubular member is a bell 16 which has its free edge formed in the shaft of a ring 17 which ring abuts the front of the cabinet as illustrated in Figure I.

Securing blocks 18 serve to position the bell 16 which is held thereto by screws 19.

At 21, I have shown a cross-shaped member which is also secured to the block 18 as by screws 22. This cross-shaped member has secured to its central portion a deflector 23 which is provided with a bore 24;.

' Braces 26 equally spaced about the same and secured thereto are also secured to the cross-shaped member 21. These braces serve to maintain the deflector in proper position.

The result of this construction is that when the amplifying unit is attached to the unit attachment 11 music or other sound reproduced therein will pass through the at tachment 11 and be projected into the tubular member 7. Passing through the tubular member it will engage the deflector 23 and be deflected through the bore 24 until it reaches the bell 16 where it will be again defiected out of the amplifier into the surrounding atmosphere.

It will thus be seen that with this con struction I have secured a path for the reproduced sound which path is of great length but confined within a minimum amount of space. I

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same and that various changes relative to the material, size, shape and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claim.

Having thus described my invention, I claim i In an amplifying device of the character described, a cabinet having a substantially semi-circular cross section, an end block secured in said cabinet, a tubular element centrally positioned within said cabinet, means for connecting a further reproducing element to said tubular element, a bell shaped element positioned Within said cabinet, said and a plurality of braces secured to said bell shaped element having its end reduced grille and to said deflector, said braces being and secured to said tubular element and havequally spaced about said deflector. ing its flared end secured to said cabinet, a In testimony whereof I afiix my signagrille secured to the open end of said cabinet, ture.

a deflector secured to said grille and surrounding a portion of said tubular element, REUBEN H. A. ENGLUND.