US1772163A - Diaphragm for sound-reproducing machines - Google Patents

Description

s- 5, 1930. A. E. sQukARs 1,772,163

DIAPHRAGM FOR SOUND REPRODUCING MACHINES Filed May 22, 1925 attorney:

15 of the character specific Patented Aug. 5, 1930 UNITED .STATES PATENT OFFICE matron SQUYABB, OI VALDOSTL GEORGIA, ASSIGII'OB OI orm-ms TO THOMAS 0, ICLENDON, OI VALDOSTA, GEORGIA! Application 'fled Kay 22,

This invention relates to diaphragms for sound reproducing machines, and has forone of its principal objects the provision of a diaphragm which may be em loyed inconnection with standard makeso machines, and

which will aid substantially in the clear reproduction of sound.-

Another and equally important object of the invention is to provide a diaphragm which will re reduce the recorded sounds without artificial, metallic, rasping, or other objectionable noises usually present in sound reproducing machines.

A further object is to rovide a diaphragm (Y which is durable, of highly simplified construction, and cheap to manufacture.

Other objects and advantages will be apparent during the course of the following description;

In the accompanying drawings forming a part of this application, and in which like numerals are employed to designate like parts throughout the same Fig. 1 is a perspective view of the improved dia hragm.

ig. 2 is'a sectional r spec tive of the same.

In the drawings w erein for the purpose of illustration is shown a preferred embod1- ment of the invention, the numeral 5 designatesthe improved diaphragm, which as illustrated in Fig. 1 is in the nature of a discshaped body having a marginal rim 6. The

will not set up objectionable foreign noises.

Particular attention is directed to the fact that the web or central portion of the body of the diaphragm is of approximately the same thickness as the marginal rim 6, and that the edge portion of the web, or that portion of the web whichfjoins the marginal rim is aproximately onehalf as thick as the rim.

is. provides an attaching -portion of the stre h without making the web int where the nry I unneoessarilyt ick at the necessary'movement takes tp ace. In the-manufactured ennproved diabody of the diaphragm is gradually and u'ni- 1925. Serial m. 82,181.

phragin, I employ a composition of hard fiber and chamois skin, and grind the same together into a sin le mixture. This hard fiber may be in the orm of wood pulp. The mixed fiberand chamois skin are now compressed into the form of a hard sheet in a heavy dut press, and are then cut into the form of 'scs. The discs are treated with benzol .and aniline dyes, and arethen put in another press and pressed into the shape il- 00. lustr'afed in the drawing. 1

Finally, the diaphragm is coated wtih shellac and polished. It is believed to be well known that the shellac coating preserves and prolongs the life of the diaphragm.

It is believed to be obvious that the improved diaphragm may be easily mounted in the usual manner, and'in use will reproduce the recorded sounds without setting up objectionable sympathetic noises.

The discs are first treated with benzol so that they will be rendered more flexible and are subsequently treated with aniline dye which give the disc a color and fill up any pores that may be present therein. 7

Having thus described the invention, what is claimed is: g i

1. A diaphragm consisting of a compli'ie'ssed mixture of hard fiber and chamois 2. A diaphragm consistin of a compressed mixture of hard fiber and c amois skin, and said diaphragm being coated with shellac.

In testimony whereof I aflix my signature.

, ALEXANDER E. 'SQUYABS.

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