US1509567A

US1509567A - Amplifier

Info

Publication number: US1509567A
Application number: US619144A
Authority: US
Inventors: Henry K Sandell
Original assignee: Individual
Current assignee: Individual
Priority date: 1923-02-15
Filing date: 1923-02-15
Publication date: 1924-09-23
Anticipated expiration: 1941-09-23

Description

Patented Sept. 23, 1924,

PATENT OFFICE.

HENRY K. SANDELL, OF CHICAGO, ILLINOIS.

AMPLIFIER.

Application filed February 15, 1923. Serial No. 619,144.

T all whom t may concern:

Be it known that I, HENRY K. SANDELL, a citizen of the United States, residing at 1640 Farragut Avenue, Chicago, in the county of Cool; and State of Illinois, have invented new and useful Improvements in Ampliers, of which the following is a specification. y

The present invention relates to improve ments in amplifying devices and more particularly in amplifiers intended for use in connection with vibrating diaphragms such as those of phonograph sound boxes, telephone and wireless receivers and the like. It will be fully understood from the following description illustrated by the accompanying` drawings in which- Fig. l is a vertical section view through an amplifier embodying the invention.

Fig. 2 is a horizontal view on the line 2`2 of Figure l.

in accordance with the present invention, 'the amplifier constructed in such a manner as to substantially eliminate resonance and prevent the production of vibration of the amplifier itself and resultant interference with the amplification and propagation of the sound waves which it is desired to amplify.

Referring more particularly to the drawings, the numeral 5 indicates a base board forming one wall. of the amplifier and preferably constructed of substantially triangular shape. The base board 5 is substantially flat in the form of construction shown. F rom it rise two supporting members 6, which serve as a support for the amplifier wall T opposite the wall 5. The amplier wall 7 is formed of wood, beaver board, or other suitable material and is given a pronounced curvature from the mouth of the amplifier to its throat. Between the upper and lower wallmembers 5 and 7, there are secured to the supporting members 6 the side walls 8, which are curved from the 45 mouth of the amplifier to its throat, the curvature of the side wall members 8 being substantially the same. These side wall members are constructed of any suitable non-resonant material, for example, lead. At the throat of the amplifier there is seh cured to the walls 5 and 7 and to the supporting members 6 a nipple 9 provided with a gradually enlarging portion 10 which. enters the amplifier and a smaller external portion ll to which the receiver l2, or other device containing a vibrating diaphragm is attached. It will be noted from the above description of the construction that the walls 5 and 7 are constructed of vibratable 60 or resonant material of different curvatures,

so that they do not have identical vibration characteristics. The side walls 8, which are formed with like curvatures, are of nonresonant or vibratable material. As a result of this form of construction, vibrations cannot be set up in the amplifier as a rcsult of the rates of vibration of the sound waves passing through it; in short, the construction as a whole, is substantially nonresonant.

Jdlthough the present invention has been shown in connection with the specific details of a construction embodying the same, it is not intended that these details shall be regarded as limitations upon the scope of the invention except in so far as included in the accompanying claim.

l claim:

An amplifier having a substantially fiat bottom wall of triangular shape, supporting members rising therefrom, a top wall resting upon said supporting members and curved from the mouth of the amplifier to its throat, and curved side members of nonvibratable material secured to said supporting members. v

HENRY K. SANDELL.