US1682656A

US1682656A - Loud-speaker horn

Info

Publication number: US1682656A
Application number: US100782A
Authority: US
Inventors: Johan O Bergman
Original assignee: ROCKFORD NOVELTY FURNITURE COM
Current assignee: ROCKFORD NOVELTY FURNITURE Co; ROCKFORD NOVELTY FURNITURE COM
Priority date: 1926-04-09
Filing date: 1926-04-09
Publication date: 1928-08-28
Anticipated expiration: 1945-08-28

Description

' Patented Aug. 28, 1928.

- UNITED STATE mm o. ransom, or nocxnonn, 'ILLlZNOIS,

rumors, a conro-zanrron or rumors.

FURNITURE COMPANY, OF ROCKFORD,

PATENT OFFICE.

ASSIGNOR TO ROCKFORD NOVELTY LoUn-srnmn norm.

Application filed April 9,

nection with phonograph reproducers.

The rincipal object is to provide a horn ,particu arly well adapted for mounting in cabinets in the confined space usually available which has better acoustic properties than those heretofore. provided.

With the foregoing object in view, the in. vention provides, in eliect, a horn within a horn in reversed relation so as to make a longer air column available and thus increase the volume and produce truer tones, the arrangement also giving rise to a reflection of the sound from the source whereby the echo is transmitted. A horn embodying these features, in addition to being simple and economical in construction, is thoroughly practical since it lends itself to installation in a variety of cabinets by reason of its compactness and peculiarly adaptable form.

The invention is illustrated in the accom- I panying drawing, whereinwooden construction the bottom wall 11 F1 1 is a front view of a horn embodying the novel features above referred to; and Fig. 2 is a longitudinal vertical section taken on the line 2-2 of Fig, 1 looking in the direction of the arrows.

The horn of my invention, as illustrated by the present preferred embodiment, comprises a main horn or bell 5 and a secondary orn or hell 6 preferably. within the same and reversed in direction with respect thereto. Both'horns are referably entirely of ibr best tone qualities. The main horn 5 is of a truncated form and has a relatively thick back wall 7 with side walls 8 and 9 and top and

bottom walls

10 and 11 extending in outwardly divergent relation thereto maintaining an approximately rectangular section throughout, as shown. The secondar horn 6 is built upon g the main horn with this wall forming one of the side wallsof the secondary horn. The term side, as

here used, and as used in the claims, should .be taken merely as distinguishing from end walls such as the back wall 7 of the main horn 5 or the back wall 12 of the secondary l6 horn 6. The back wall 12 of the secondary horn 6-, it' be noted, is relatively thick as are also the

side walls

13 and 14. The

From the description small end of the main horn me. Serial no. 160,752.

remaining wall 15, however, is comparatively thln. The purpose in roviding the side walls of the main horn oi appreciable thickness, as well as the back and side walls of the secondary horn, is to eliminate'any tendency for any unpleasant vibrations being set up within the usual vibration periods of the sounds transmitted. The wall 15 is pro vlded comparatively thin so as not to restrict the sound passage and no objectional vibrat ons are apt to be set up at this source in view of the fact that all of the walls joinmg therewith are comparatively heavy. thus far it will be apparent that the area of the section of the sound passage increases gradually from thesmallend of the secondaryhorn to the large end thereof and thence from the small end of the main horn to the. large end of the latter.. The large end of the secondary horn the same Width as the and, as will be apparent from the drawing, is of approximately half the hei ht.

By virtue of t e arrangement of the secondary horn 6 within the main horn 5 directed toward the rear wall 7, there is made available an air column of ap roximately the aggregate length of the two orns while is approximately of only the overall length of the main horn has to be taken into consideration in the mounting of the horn in a cabinnet. The increased air column. afiorded gives greater volume and truer tones. Harshness of tone is entirely eliminated. Overtones incident to "vibration of the material of the transmitting medium are avoided by providing the horn entirely of wooden construction with the roper wall thicknesses, as above mentioned.

he sound originating at the small end of the secondary horn is reflected at the back wall 7-of the main horn and the echo is trans mitted. An openin 16 is provided in the bottom wall 11, of the main horn communieating with the small end of the secondary horn, as shown. A loud speaker unit 17 of any one of the usual or preferred types is mounted at the opening 16, as shown. A plate 18 for supporting the unit may be secured to the outside wall 11 at the opening it is believed that the foregoing descri tio'n conveys a clear understanding of t e invention and-of its purposes and advantages so that anyone skilled in the art to which 1 smal horn communicating with sihle applications thereof. v

I claima' 0 1. A horn of the-character described compridsa main horn having a bee wall an fverging side walls extending out wardly there rom, and a secondary horn within the main horn in reversed relation thereto so as to be directed toward the back wall thereof and having a side wall in common with the main horn, said wall having an o ening therethrough leading into the end of the secondary horn. Y 2. An amplifier horn comprising a :main horn having a back wall and diverging side walls extending outwardly therefrom, and

Ya secondar horn built within said main horn in revers relation thereto so as tobe directed toward the back wall thereof, said seconda horn having one of its side walls formed y one of the .side walls of said main horn.

3. An amplifier horn comprising a main horn having a back wall and diverging side walls extending outwardly therefrom, and a secondary horn disposed within saidmain horn on one side wall thereof and in reversed relation thereto so/ as to be directed toward the back wall an opening in the side wall of said the small end of mam V said secondary horn to provide a place ,for

v,on one of the 'side walls' thereof using said thereof, there being mounting a re'producer unit transmitting into the small end of said secondary horn. 4. An amplifier horn comprising a main horn of a truncated bell form havin a back wall and diverging side walls exten ng out-v wardly therefrom, and a secondary horn b t onto one of the side walls of said 111 in horn usin said side wall as one of the side walls-o said secondary horn, said secondary horn being reversed in relation to said main horn an directed toward the back wall thereof, the small end of said secondary horn being arranged to have communication with a sourceo large small end of said main horn. 5. An amplifier horn comprisingla main .bell having a thick back wall and t walls divergin outwardly therefrom, and a secondary be 1 built within said main bell wall as one of the walls of said secondar bell, said secondary bell having a'thick bac wall and thick diverging lateral walls, the -remaining wall being relatively ex ding with said lateral J OHAN O. BERGMAN.

sound, and the end thereof communicating with the.

ick side thin and walls in diver -i" relation from said last mentioned bac wal inwardly relative to said-main bell toward the back