US1047789A - Gramophone, phonograph, and like horn. - Google Patents

Description

J. GREEN. GRAMOPHONE, PHONOGRAPH, AND LIKE HOR Patented Dec. 17,1912.

APPLICATION FILED FEB.13,I911.

&

'ofhorns for gramophones,

. by the passage therethrough of JOSHUA GREEN, or nonnon'nnemnn GRAMOIfHONE, PHONOGI RIAPH, AND LIKE HORN" Specification of Letters Patent.

Patented Dec. 17,1912.

Application filed February 13, 1911. Serial ll'o. 608,255

To all whom it concern; a

Be it known that I, JOSHUA GREEN, a su b ject of the King of Great Britain, residing at 27 Pyrland road,- Canonbu-ry, London, England, have invented new and useful Imrovemepts in Gramophone, Phonograph, and Like Horns, ofwhich the following is a specification- My invention relates to. the manufacture the like. Such horns are. inpractice usually made of metal, such as tin, or of wood, and in the latter case are built up of sections or strips, the edges of the adjacent stripsbeing connected together so as to form-a complete horn. This construction, however, is costly. Now, my invention has for its object to provide means whereby such wooden horns, which, for various reasons are preferred to the tin horns, can be manufactured at a considerably less cost than has hitherto been possible. To this end, according to, my invention I make a horn from a single blank ot'wood which shaped to the usual conformation and is connected together at the two adjoining edges.

In carrying out my invention I advantageously proceed as follows, that is to say, I

takea blank of ply-wood, and 1 subject thesame to a dry heat, the heat being continued until the wood becomes pliable and can be worked on a mold of the shape of the horn to be produced. In practice I may of ahollow metal mold whichis internally heated in any suitable way,say, for example, the gases of combustion from afire or furnace, or of steam. The ply-wood from which the horn is to be made is applied to the said heated mold and is gradually caused to assume the shape of the finished horn. To connect the,

' butt st rip,

' be opened out or abutting edges of the bent blank forming the horn, I may, for example, make use of a or I may halve the edges and connect them together or I may connect them in any other well known way.

In the case of horns in which the bell mouth or flared end is of marked dimensions some ditficultymay be experienced in the molding and I may, therefore, make the extremity of the strip which to form the said bell-mouth or flared end witha series of slits which permit flared to-the extent.- desired. The wedge or other shaped spaces-whichare formed by the slits when the extremity is phonographs andmake usethe said extremity to' thus opened out may be filled up in any convement way. For example, separate pieces of wood maybe filled in the said spaces or a strip or strips. of wood may. be applied circumferentially around the inner orthe outersurface of thehorn at the slit extremity;

In practice the insertions or portions .of

Wood applied to the flared end or bell-'m'outh of the horn may be of differentcolors thus giving rise to artisticeflects of a kind which may be varied as desired. v f

To enable the invention to be fully understood, I will describe it by reference to the accompanying drawing, in which Figure 1 is a side view of a horn molded from a single blank of wood'according to my invention- Fig. 2 is a front view there of. Fig,- 3 is a transverse section of the joint between the edges of the wooden blank forming the horn and drawn to {a larger;- scale. Fig. 4 is a view similar to Fig. 3, but illustrating a modifiedLform of joint, and.

5 and 6 are views similar to Figs. "1 and 2 respectively of the modified construction of horn.

Referring first to the construction of. horn illustrated in Figs. 1 to 3, a represents the. single blank of ply-wood which wood is molded to the 'shape indicated by being subjected to a dry. heat which is continued as above described until the wood becomes sufficiently pliable to permit of its being molded to the desired shape. paratus may be made use of for molding the wood such as a hollow metal mold inteinally heated by steam or other gas or vapor. It is'necessary that the ply-wood,.'to-stand this treatment should be specially pliable.

I have found that three-ply wood made of alder, the cute layers being imillimeter "in thickness and t-he-inner layer millimeter is sufficiently 1 that in the ply-wood .employed'by me, as in all ply-woo'd, the grainof each layer'is disposed across Thetwo meeting or abutting edges. 6, c, of the molded blank a forming the horn are Any suitable. ap'-':

iable. It is to be, i 1nder stood-'- the grain of adjacent layers.

connected'toget-her by meansof the joint strip (Z which is applied externally to the horn as illustrated. Or the joint maybe made as indicated in Fig. l that is to, say, by halving the meeting edges 12 and 0. Figs. and 6' illustrate a horn in which the flaring end of the molded strip a is formed with slits or cut away" portions e,; the spaces thus formedwhen the flared end is molded being filled up by the separate pieces of Wood f, f which are applied around the outer or inner periphery of the horns; in the construction illustrated the said pieces f are applied externally.

As above stated the pieces f may be composed of Wood of a different color from that forming the body a of the horn, thus giving rise to varied artistic efiects.

Claims. I

1. As a new article of manufacture, an amplifying born for gramophones and the like, consisting of a single integral piece of previously prepared ply-Wood, and having its meeting edges united to form a single seam extending longitudinally of the horn.

2. As a new article of manufacture, an amplifying horn for gramophones and the like, consisting of a single integral piece of previously prepared ply-Wood, and having its'meeting edges united to form a single seam extending longitudinally of the horn,

the marginal portions at the larger end ofthe horn being split and the integral pieces so formed being spread apart, and separate pieces secured to said separated integral pieces to close the apertures formed between them and complete the bell of the horn.

JOSHUA GREEN. Witnesses:

J OHN E. BOUSFIELD, A. ALBUTT.

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