US1752526A

US1752526A - Sound amplifier

Info

Publication number: US1752526A
Application number: US120438A
Authority: US
Inventors: Frank C Hinckley
Original assignee: COLUMBIA PHONOGRAPH CO Inc
Current assignee: COLUMBIA PHONOGRAPH CO Inc; COLUMBIA PHONOGRAPH COMPANY Inc
Priority date: 1926-07-03
Filing date: 1926-07-03
Publication date: 1930-04-01
Anticipated expiration: 1947-04-01

Description

April 1, 1930. F. c. HINCKLEY 1,752,526

SOUND AMPLIFIER Filed July 3, 1926 2 Sheets-Sheet 1 INVEN TOR.

F. C. HINCKLEY April 1, 1930.

SOUND AMPLIFIER Filed July 3, 1926 2 Sheets-Sheet 2 INVENTOR. inc/file Patented Apr. 1, 1930 UNITED STATES PATENT OFFIC FRANK C. HINCKLEY, OF STRATFOIR-D, CONNECTICUT, ASSIGNGR TO COLUMBIA PHONO- GRAPH COMPANY, INC, OF BRIDGEPORT, CONNECTICUT, A CORPORATION OF NEW YORK SOUND AMPLIFIER Application filed July 3,

This invention relates to new and useful improvements in means and method of amplifying sound, and has particular reference to such means and methods when applied to I sound reproducing machines, such as phonographs or talking machines, loud speaking telephones and radio apparatus.

An object of the invention is to provide an mplifier which properly amplifies the higher frequencies, and also amplifies and makes fuller the base or lower frequencies.

Another object of the invention is to provide an amplifier having a pair of tone chambers, one of which is larger than the other, the sound which passes through the two chambers having the same point of origin but being divided before it reaches the chambers.

An additional object is to provide an amplifier, wherein the sound is divided after entering the amplifier, passed through a pair of horns of equal size into tone chambers of diiferent size, the sound being maintained in its divided state during its passage through the horns and tone chambers.

A further object is to provide an amplifier, including a pair of tone chambers, a pair of horns disposed one above the other and emptying into the tone chambers, together with means disposed between the horns for dividing the sound and discharging it into the horns, the means being supported by the lower horn and in turn supporting the upper horn.

Additional objects and advantages will become apparent from a consideration of the following description taken in connection with the accompanying drawings wherein:

Fig. 1 is a front elevation of the amplifier, the same being shown as disposed within a cabinet, the upper portion of which is broken awa v 2 is a sectional view on the line 2-2 of Fig. 3;

Fig. 3 is a horizontal sectional view along the line 33 of Fig. 1 and Fig. 4 is a detailed sectional view on the line l4 of Fig. 3.

Referring in detail to the drawings,-5 indicates an enclosure for the amplifier, which enclosure is shown as a phonograph cabinet,

1926. Serial No. 120,438.

certain portions thereof forming parts of the amplifier. However, it will be understood that the amplifier may be made up as a unit and merely slipped into the cabinet or other enclosure, and secured therein.

The am Jlifier per se includes diagonally disposed upper and

lower horns

6 and 7 respectively, similar in construction and size. fihese horns comprise outside blocks 8 (see Fig. 2) having their inner surfaces curved, and inside blocks 9 having their corresponding surfaces out along a curved line. Sides 10 connect the

blocks

8 and 9 so as to provide a complete horn having an entrance at 11 and an exit at 12. Also, these sides support the blocks in their proper relative positions.

A dividing board or partition 13 is arranged within the enclosure or cabinet 5, above the center thereof, so as to provide a pair of

tone chambers

14 and 15, the chamber 1.5 being considerably larger than the chamber let. Arranged beneath, and spaced slightly from the partition 13 is a member 16 for dividing the sound being amplified into two columns, one of which is passed through the upper horn 6, and the other of which is passed through the lower horn 7.

The upper tone chamber 14 is formed by the outer wall 10 of the upper diagonal horn and by the wall 5 of the cabinet or enclosure 5, together withthe partition 13 and the upper wall 5 of the cabinet. Similarly, the lower tone chamber is formed by the outer wall 10 of the lower diagonal horn and by the wall 5 of the cabinet together with the partition 13 and bottom 5.

Sound to be amplified is delivered into a metallic throat or conduit 17 from which it passes downwardly and enters the member 16 a 18, from whence it is directed forwardly through the throat 19 of said member. The sound is then divided and passed through

arms

20 and 21 of said member. That portion of the sound which passes through the arm 21 is delivered into the upper horn 6, while the sound which has passed through the arm 20 is directed downwardly through opening 22 into the lower horn 7 From

horns

6 and 7, th sound passes into the tone chambers 14% and 15 respectively to be further amplified show and mellowed and then discharged into the atmosphere.

Since the sound enters the diagonally disposed

horns

6 and 7 towards the front of the cabinet and is discharged therefrom at the opposite rear corners of the cabinet, reflecting means or boards 23 are provided to direct the sound forwardly and out through the

tone chambers

14 and 15. These reflectors, as n, comprise relatively thick pieces of wood having their front surfaces convex. Also, the forward side board 10 of each of the horns is cut away at the discharge endsot the horns, as shown at 24. To prevent leakage of sound around the forward ends of the diagonally disposed horns, curved pieces or fillers 525 are used.

As above stated, the member 16 is disposed beneath and spaced slightly from the dividing board or'partition 13, and this is clearly shown in Fig. 4c. In said figure, sideboards 10 shown passing through the partition 13 and resting on the upper surface of the arm 21 of the member 16; the block 9 of the horn 6 also resting on this arm. If it is found desirable, a filling of wax or the like can be used to close the space between the partition and the upper portion of the lower horn and the member 16. In actual practice, space 26 is quite small, being not more than or '1 he upper and

lower tone chambers

14 and 15 being of different size. provide for the amplification of high or shrill notes, and low or bass notes, with equal fidelity. Moreover, the partition being arranged above the member 16 said member is substantially concealed, its arm 20 being entirely concealed in the rear of the front board 10 of the lower horn while its arm 21 is concealed from casual observa tion by the partition.

lVhais claimed is:

1. In a sound amplifier means for dividing the sound, a horn at each side of said means and receiving the sound therefrom, said horns being of the same size and tapering from their entrance to their exit openings, and a pair of tonechambers receiving the sound from said horns, the lower of said tone chambers having a cubic capacity of approximately 25% more than the upper tone cha1n-.

her.

A sound amplifier comprising an entrance throat, a member receiving sound from said throat, said member dividing the sound into two columns, upper and lower horns receiving the sound from said member, a dividing board disposed above the lower of said horns and spaced above said member and embracing the lower portion of the upper horn, said upper horn resting on said memher, and a pair of tone chambers One above and the oth r below said dividing board into which the respective horns discharge.

3. A sound amplifier including a compartment, a partition dividing the compartment into which the respective horns discharge.

into a pair of tone chambers, a member disposed in one of said chambers and having a passage therethrough, including an inlet and a pair of outlets, a diagonally disposed horn positoned in each of saic chambers and arranged at right angles to each other, and said horns receiving sound from the outlets of said member and delivering it to said tone chambers.

i. A sound amplifier comprising. an enitrance throat, a member receiving soundfrom said throat and dividing it into twocolumns, a pair of horns one for each of said columns and receiving sound from said member, a dividing board spaced-from one of said horns and said member and embracing the other of saidhorns, said last-mentioned horn abutting said member, and a pair of tone chambers one at each side of" said dividing board and 5. In a sound amplifier, means for dividing the sound, said means including a pair of diverging passages each leading to a separate exit opening, said exit openings facing opposite directions, a horn at each of said openings and receiving the sound therefrom,-said horns being of the same size and tapering from their entrance to their exitv openings, and a pair of tone chambers receiving the sound from said horns, said tone chambers being ditl'erent in size and the lower of said tone chambers having a cubic capacity approximately 25% greater than the cubic capacity of the upper tone chamber.

6. A sound amplifier comprising an en- (7 trance throat, a member receiving sound from said throat and dividing it into two columns, a pair of horns one for each of said columns and receiving sound from said member, a dividing board spaced from one of said horns and said member and embracing the other of said horns, said last-mentioned horn abutting said member, a pair of tone chambers the exit portion of the lower of said tone chambers being of greater cross-sectional area than the exit portion of the upper of said tone chambers,and said tone chambers disposed one at each side of said dividing board and into which the respective horns discharge.

7. A sound amplifier comprising an eni trance throat, a member receiving sound from said throat and dividing it into two columns,

'a pair of horns one for each of said columns,

dividing means with diverging v passages emptying into said horns and which carry the sound in substantially opposite directions but in different vertical planes, and tone'chambers receiving the sound from said horns and directing the same backwardly in the direction of its passage through the dividing means.

8. A sound amplifier comprising an entrance throat, a member receiving sound from said throat and dividing it into two columns,

a pair of horns one for each of said columns, 1 30 said dividing means having diverging passages emptying into said horns, said horns carrying the sound in substantially the opposite direction but in different vertical planes, tone chambers receiving the sound from said horns and directing the sound back in the direction of its passage through the dividing means, and one of said horns and tone chambers being arranged over the other horn and tone chamber, and one horn and tone chamber directing sound in substantially different directions.

9. A sound amplifier comprising an entrance throat, a member receiving sound form said throat and dividing the sound into two columns, upper and lower horns receiving the sound from the respective passages in said member, a dividing board disposed above the lower of said horns and spaced above said member and embracing the lower portion of the upper horn, and a pair of tone chambers one above and the other below said dividing board into which the respective horns discharge.

Signed at Bridgeport, in the county of Fairfield, and State of Connecticut, this 30th day of June, A. D. 1926.

FRANK O. HINCKLEY.