US3517769A - Quadruple sound output loudspeaker enclosure - Google Patents

Description

June 30, 1970 P. D. BRoUssARD 3,517,769

QUADRUPLE SOUND OUTPUT LOUDSPEAKER ENCLOSURE Filed March 2e, 1969 United Statesl Patent Cilce 3,517,769 Patented June 30, 1970 3,517,769 QUADRUPLE SOUND GUTPUT LOUDSPEAKER ENCLOSURE Paul Daniel Broussard, Andrew, La. (Rte. 2, Box 271, Kaplan, La. 70548) Filed Mar. 26, 1969, Ser. No. 810,503 Int. Cl. G10k 13/00; H04r 7/00 U.s cl. 181-31 7 claims ABSTRACT F THE DISCLOSURE The present invention relates to my new and improved loudspeaker enclosure for increasing enclosure eiliciency and output, and suitable for high fidelity audio reproduction.

In the accompanying drawings:

FIG. 1 is a front plan view of the loudspeaker enclosure with its front grille removed;

FIG. 2 is an inner view illustrated from the top of the loudspeaker enclosure with its top member or panel removed;

FIG. 3 is a cross section through 1-1 of FIG. l;

FIG. 4 is a cross section through 2-2 of FIG. l; and

FIG. 5 is an enlarged cross section through 3-3 of FIG. 2.

Referring to the drawing, the present loudspeaker enclosure is comprised of a loudspeaker in FIGS. 2 and 3, a back or rear wall 11 in FIGS. 2, 3, and 4, a top 12, and a bottom 13 in FIGS. 1, 3, and 4.

The loudspeaker 10 is mounted to a ported baille 14 in FIGS. 1,` 2, 3, and 4, the front grille 15 is shown by dashed lines in FIGS. 2, 3, and 4, the carrying handles 16 and 17 are shown in FIG. 1, the glides or casters 18 are shown in FIGS. l, 2, and 4, and the loudspeaker 10 is connected by a hookup cable 42 to a suitable jack 19 in FIG. 2.

The present enclosure also comprises of a loudspeaker bridge 20 in FIGS. 2 and 3, which is lightly secured t0 the loudspeaker cone 41, such as with any suitable adhesive. The said bridge 20 may be a relatively rigid T- shaped or similar member made of plastic, wood or any suitable material, employed to transmit the loudspeaker cone 41 movement to a membrane or diaphragm 21, which may be made of thin plastic, polyethylene, or any suitable material, stretched between a fixed mounting member 22 and an adjustable mounting member 23 in FIGS. 2 and 3.

Secured to the ilexible membrane 21 is a second membrane or diaphragm 24 which may be made of thin material, but which is preferably slightly harder than the ilexible membrane 21, such as plastic laminate, employed to transmit the loudspeaker cone 41 vibrations to all areas of the lrst membrane 21 as in FIGS. 2 and 3.

As illustrated in FIGS. l and 2, member 23, which supports and tensions the iirst membrane 21, is held in place at one end by a fixed support 25 in FIG. 2. Whereas, the other end of the said member 23 is linked to and supported by an adjustable member 26. The adjustable member 26 may be an adjustable guitar tuning gear or any suitable adjusting means mounted and passing through an enclosure cabinet side 27, such as through a guitar tuning gear insert 28, into member 23, where a suitable lpin 29 links the guitar machine gear 26 to the member 23 as in FIG. 5. Therefore, by rotating the knob 40 on the adjusting 4means 26 in FIGS. 1, 2, and 5, the tension upon the flexible membrane 21 in FIGS. 1, 2, and 3 may be adjusted and regulated. As in FIGS. l and 2, the enclosure also comprises of a second side member or panel 38.

Since the operation of a loudspeaker is readily understood in the art, its operation will not be discussed in detail, except to be understood that the cone 41 of any loudspeaker 10 will move forward and backward, assuming an instrument is connected to and played through the jack 19 in FIGS. 1 and 2.

The present loudspeaker 10 is mounted to a ported baille 14, thus said baille has a port hole 39 in FIGS. 1, 2, and 4, for sound refraction to pass through. Furthermore, the ported baille 14 is not placed parallel to the front nor back of the enclosure, but rather at an angle, preferably, between two and fifty degrees from parallel to the enclosure back or rear wall 11 as indicated by 30 in FIG. 2, causing the sound refraction or background movement of the loudspeaker cone 41 to reilect sound toward and through the port hole 39, in the baille 14, as shown by 35 in FIGS. 2 and 4.

In FIG. 4, above and below the port hole 39, in the baille 14, are port baille plates 31 and 32, which are placed at an angle indicated by 33 and 34, to direct the propagated sound waves back through the port hole 39. The angle of the baille plates 31 and 32, preferably, should be between two and fifty degreesfrom parallel to the baille 14, to redirect the sound waves above and below the port hole 39, in the baille 14, back through the port hole 39. Therefore, the sound refraction of the back side of the loudspeaker cone 41 in FIG. 2 follows the path indicated by 35 in FIGS. 2 and 4.

When the loudspeaker cone 41 moves forward, the sound waves produced by the cone 41 takes the path indicated by 36 in FIG. 2. Furthermore, as the loudspeaker cone 41 moves forward, this causes the loudspeaker bridge 20, as well as the membranes 21 and 24 to be set into motion. Thus, the membranes 21 and 24 also produce sound just as does the loudspeaker cone 41, except the membranes 21 and 24 have a much larger vibrating area, and greatly increase the eiliciency and output of the loudspeaker 10y in FIGS. 2 and 3.

The backward movement of membranes 21 and 24 in FIG. 2, cause sound to also take the path indicated by 36. Whereas, the forward motion of membranes 21 and 24 cause sound to move as indicated by 37 in FIG. 2. Hence, due to having both the loudspeaker cone 41 forward and Iback-ward movement, and the forward and backward movement of membranes 21 and 24 causes quadruple sound output.

The present enclosure may include an outer covering which was not illustrated. Furthermore, only one loudspeaker is illustrated, however, more than one loudspeaker may be utilized if desired.

The foregoing is considered as illustrative of the prin- .ciples of the invention, further, since modiiications and rear wall, a loudspeaker mounted therein to a parted bafe which is disposed at an angle from parallell to thehrear wall of the enclosure, va tensioned ilexible rnembrane'or diaphragm mounted in said enclosure vand spaced forwardly from the said loudspeaker, anda bridge secured to the loudspeaker cone and contacting the said mein@ bran'e. 2. The invention dened in claim 1, wherein the ported baille is mounted betweentwo and fifty degrees from'v parallelto` the rear wall. s

3. The invention defined inA claim 1, `wherein baille ,Y I

plates are secured above and below the port hole in the baille and disposed at an angle from parallel to the baille.

4. The invention defined in claim v3, wherein the port baille plates are mounted between two and fifty degrees from parallel to the baillle. v

5. The invention defined in claim 1, wherein means coupling the bridge and the membrane comprising an- 20 ...Qtherlesetible .mmebrane Secured. to.. the tensione@ ilexible membrane. 6. The invention denedrin claim 1, wherein the tensioned membrane is substantially parallel to said rear wall.

7. The invention defined in claim 1, wherein the ilexiblemembrane is tensioned between a xed support land an adjustable support..

y References Cited yAnastin v181-31 STEPHEN J. ToMsKY, Primary/'Examiner `U.s. C1. X.R.

UNITED STATES PATENT oEEICE CERTIFICATE 0F CORRECTION Patent No. 3,517,769 June 30, 1970 Paul Danlel Broussard It is certified that error appears in the above identified patent and that said Letters Patent are hereby corrected as shown below:

Column 3, line 3, "parted" should read ported Signed and sealed this 16th day of March 1971.

(SEAL) Attest:

Edward M. Fletcher, J r.

Commissioner of Patents Attesting Officer WILLIAM E. SCHUYLER, JR.

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