US2476572A - Loudspeaker cabinet with plural partitions forming labyrinth - Google Patents

Description

y 1949- J. J. WENZEL 2,476,512

LOUDSPEAKER CABINET WITH PLURAL PARTITIONS FORMING LABYRINTH Filed May 1, 1946 2 Sheets-Sheet l FIG. 2.

M INVENTOR 9 9' W WW 1'4 M ATTORNEY July 19, 1949. .1. J. WENZEL 7 2,476,572

LOUDSPEAKER CABINET WITH PLURAL PARTITIONS FORMING LABYRINTH Filed May 1, 1946 2 Sheets-Sheet 2 F IG.6.

INVENTOR MY/jaw ATTORNEY Patented July 19, 1949 UNITED LOUDSPEAKER CABINET WITH PLURAL PARTITIONS FORMING LABYRINTH James J. Wenzel, New Orleans, La.

Application May 1, 1946, Serial No. 666,290

1 Claim. 1

My invention relates to sound amplifiers and modulators. The device is intended for use with radio, phonograph, and orchestra. An object of the invention is to provide for reproducing sounds and musical tones accurately over the entire musical scale regardless of the volume of sound which is to be amplified or reproduced.

In carrying out my invention, I provide a cabinet having resonant partitions, a loud speaker associated with an opening in a vertical wall of the cabinet, and a bottom having openings through which lower frequency tones and back ground music are delivered.

The novel features which I believe to be characteristic of this invention are set forth with particularity in the appended claim. The invention itself, however, both as to organization and method of operation, together with additional objects and advantages thereof, will be best understood from the following description of a specific embodiment when read in connection with the accompanying drawings in which,

Fig. 1 is an isometric View of the outside of a cabinet.

Fig. 2 is an isometric view looking in from the back of the cabinet,

Fig. 3 is a top plan view of the cabinet with its cover and rear wall removed.

Fig. 4 is a rear elevational view showing the front wall of the cabinet.

Fig. 5 is a view in vertical section on the line 5-5 of Fig. 3.

Fig. 6 is a fragmentary enlarged view in section on the line 66 of Fig. 3.

Referring to the construction shown in the drawings for the purpose of illustrating the principles involved in this invention, the numeral 1 designates the front wall of the cabinet, 8 the cover, 9 two similar end walls, and I the bottom mounted on short legs I l The bottom It just inside the end walls is provided with elongated oval shaped openings [2. Partitions l3 extend up from bottom for more than half the distance to the top of the cabinet. These partitions are attached to the bottom at places just inside of the openings 12. Partitions [4 which are spaced from the partitions [3 toward the middle of the cabinet, extend from the top thereof more than half the distance toward the bottom. The two pairs of partitions I3 and M are in staggered relation and are made of resilient material so as to be capable of vibrating. The front wall I contains an opening l above and below which horizontal bars [6 and I! are secured to the front side with vertical slots l8 glued to these bars.

The rear of the wall 1 as will be understood from Fig. 6, is provided with strips 19 around the opening I5. Insulating material 2| is secured around the strips l9 by fasteners 22 as shown in Fig. 6, and a sound cone 23 has its peripheral rim secured to this material by bolts 24. This cone is located within the upper partitions M. The apex 25 of the cone has a short cylindrical member secured thereto which is anchored to partitions l4 and the bottom by wires 26. These wires serve to keep the apex 25 properly positioned in the cabinet. The apex 25 is intended to be connected in the usual manner with an amplifier by a conducting cable 21.

The operation and advantages of my invention will be obvious in connection with the foregoing description and the accompanying drawings. The device amplifies the sound which is to be reproduced. The upper register of musical tones comes through the sound cone 23 while the lower frequency tones and back ground music come through the openings l2 and radiates from the body of the cabinet, thus causing a tone reproduction of the original. Furthermore the device is so constructed as to radiate the sound wavers through a resilient cabinet and amplify the bass portion of these waves since there is no sound absorbing material in the cabinet. The interior of the cabinet is entirely enclosed except for the breather opening-s I2 at the bottom and just inside the end walls of the cabinet. This construction tends to amplify and bring out back ground portions of an orchestral selection to their proper volume and not merely the strong bass frequencies. Because of this action, the device serves to modulate the sound which comes out of the cabinet.

I claim:

In a sound amplifier and modulator, the combination of a cabinet having a bottom, a front wall, and two end walls, legs on which said bottom is supported, said bottom containing openings just inside said end walls respectively for exit of low frequency tones, a pair of resilient resonant non-sound absorbing partitions extending up from said bottom more than half way to the top of the cabinet and from just inside said openings respectively, a pair of resilient resonant non-sound absorbing partitions extending down from the top more than half way to the bottom and spaced inside of said first mentioned partitions, a cone shaped loud speaker associated with an opening in said front wall and located between said second mentioned partitions a short cylindrical member secured to the apex of the cone,

and wires anchoring the cylindrical member to said second mentioned partitions and to said bottom for keeping the apex of the cone properly positioned in the cabinet.

JAMES J. WENZ-EL.

REFERENCES CITED UNITED STATES PATENTS Number Name Date Olney Feb. 18, 1936 Schultz Apr. 18, 1939 Anderson July 18, 1939 Bobb May 14, 1940 Olson Dec, 17, 1940

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