US1698374A - Sound-regenerating device - Google Patents

Description

Jams, 1929. 1,698,374

W. D. PACK SOUND REGENERATIN G DEVICE Filed May 1, 1926 film-aw ATTORNEYQ.

Patented Jan. 8, 1929.

UNITED STATES" PATENT OFFICE.

'WEHRLI D. PACK, OF SALT LAKE CITY, UTAH, ASSIGNOR TO-UTAH RADIO PRODUCTS COMPANY, INCORPORATED,

A CORPORATION OF UTAH.

Application filed May 1, 1926. Serial No. 106,130.

One of theobjects of the invention is to produce a sound regenerating device which utilizes a folded membrane or diaphragm, folded so as to give stiifness in one direc 'tion and utilizing a sound vibrating member attached to the fold of the membrane to impart vibrations thereto, such vibrating unit being either an electric or similar type of device.

A further object of the invention is to produce a sound regenerating device of the character herein described, which, due to its simplicity of construction, affords an exceptionally advantageous commercial article.

A further object of the invention is to regenerate the ori'gnal sound Waves or vibrations without the interposition of a re strictive or sound modifying transformer such as a horn or megaphone, and thereby faithfully reproduce the original sound vibrations without distortions.

A further object of the invention is the production of a sound regenerating device in the form of an open book which is simple, compact, inexpensive and attractive in appearance.

Other objects and advantages will appear as the nature of the improvements is better understood, the invention consisting substantially in the novel arrangement and corelation of instrumentalities herein fully described, and illustrated in the accompany-' ing drawings, wherein similar reference characters are used to describe corresponding parts throughout the several views, and then finall pointed out and specifically dcfined and indicated in the appended claims.

gests a practical embodiment thereof, but

the invention is not to be restricted to the exact details of this disclosure, and the latter, therefore, is to be underestood from an illustrative, rather than restrictive, standpoint, g

The inventive idea involved is capable of receiving a variety of mechanical expres- 'sions, one of which, for the purposes of illustration, is shown in the accompanying drawings in which- Fig. 1 is a perspective view of a sound re generating device embodying my invention;

Fig. 2 is a sectional view taken on the line 22 of Fig. 1 looking in the direction of the arrow;

Fig. 3 is a sectional View taken on the line 33 of Fig. 1.

In the drawings 1 represents a membrane or diaphragm constructed of any desirable material which will permit of the proper flexing of the diaphragm, such as compressed fibrous material, hot pressed 'paper, 'fibre, cardboard, parchment; fibre-board, paper, sheet metal, aluminum or in fact any material may be used which is of a vibratory nature, and which can be properly held in a flexed position. The membrane or diaphragm utilized is of a large area, and I I have discovered that if vibrations occasioned by sound are imparted to the folded edge, which folded edge gives stiffness in one direction and hence the sound vibrations are transmitted from said folded edge outwardly in both directions," exceptionally clear, loud, distort-ionles's and accurate sound reproduction is obtained. In fact I have found that the sound vibrations so reproduced by such sound regenerating device are a faithful and natural reproduction .of the original sound vibrations. The membrane or diaphragm is divided by'the folded edge. At the folded edge a sound reproducing device 6 is attached, such device being an electromagnetic vibrating unit attached to the membrane at its folded edge by a connecting link 7.

I wish it distinctly understood that while I have shown an electro-magnetically vibrating unit of the balanced armature type,

device is not so limited, and that any m vibrating unit, whether electrical or" mechanical may be utilized.

The members 5 are illustrated to imitate book ends, and enclose the'sound vibrating unit, and also may be utilized as sounding boards to reinforce and amplify the sound vibrations.

In accordance with the provisions of the patent statute, Ijhave described the principle of my invention, together with the device which I now consider to represent a practi'-' cal embodiment thereof, but I desire it understood that my invention is not confined to the particular form of device herein shown and described, the same being merely illustrative, and that the invention can be carried out in other ways without departing from the spirit of my invention, and, therefore, I claim broadly the right to employ all equivalent instrumentalities coming within the scope of the appended claims, and by means of which the objects of my invention are attained, and the new results accomplished. as herein set forth, as it is obvious that the particular embodiments herein shown and described are onlysome of many that can be employed to attain these objects and accomplish these. results.

Having now described my invention,.what

I claim and desire to secure by Letters Patenti's:

- 1. In a device of the character described,

a unitary membrane secured at its edges and flexed into the form of a cuspidal'arch and a sound vibratory member attached to said.

membrane at the'cusp.

2. In a device of the character described, a base, a unitary membranesecured at its edges to said base and flexed into the form of a cuspidal arch and a; sound vibrating member attached to said membrane. at the cusp, said membrane and said base forming fin enclosure for said sound vibrating mem- In a device of the character described, a rectangular base, said base having a pair of opposite substantially perpendicular walls the upper edges of said Walls having the contour of a cuspidal curve, and a rec tangular membrane attached to said base at its ends with its edges'following the contour of the upper edges of saidwalls, and means for vibrating said membrane. v

4. In adevice of the character described, a rectangular base plate, said base plate having a pair of opposite, substantially perpendicular walls, the upper edges of said walls having the contour of a cuspidal curve, a flexed rectangular membrane attached to said base plate at its ends, with its edges following the contour of the upper edges of said Walls, and a sound vibrating membermounted upon said base plate and operatively connected to said membrane, said membrane, said walls and said base forming a casing for said sound vibrating member.

5. In a device of the character described, a rectangular base late having a pair of opposite, substantial y perpendicular walls, the upper edges of said walls having the tached to said base at its ends and creased through its center upon a line parallel to saidattached ends and flexed into the formation of a double arch of which said creased portion forms the cusp, and a sound vibrat- 'ing member mounted between said base and said membrane and having a connecting link perpendicular to said base and attached to the creased portion of said membrane.

7. As an article of manufacture, a sound amplifier of a form in imitation of an open book, comprising a rectangular base plate having an outwardly curved central por-' tion simulating the back and cover boards of an open book, a pair of substantially vertical walls having their upper edges in the form of cuspidal curves simulating the top and bottom leaf edge surfaces of an open book, a rectangular membrane attached at its'ends to said base plate and with its side edges following the upper edges of said walls and curved to simulate the upper, opposite pages of an open book, and a sound vibratin 1, member concealed under said membrane.

his specification signed this 23rd day of April, 1926.

VVEHRLI 1). PACK.

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