US1418909A - Sound-transmitting means - Google Patents

Description

H. J. DURBOROW AND B. L. WINDERS.

SOUND TRANSMITTING MEANS.

APPLICATION FILED MAR. III. 1920.

2 SHEETSSHEET I.

H. J. DURBOROW AND B. L. WINDERS SOUND TRANSMITTING MEANS.

APPLICATION FILED MAR. 18, 1920.

Patented June 6, 1922.

2 SHEETS-SHEET 2.

air/17121011 UNITED STATES PATENT -OFFICE.

HARRY J'. DURBOROW AND BAYARD L. WINDERS, OF II-IILADELPHIA, PENN SYLVANIA SOUND-TRANSMITTING MEANS.

Specification of Letters Patent.

Patented June 6, 1922.

Application filed March 18, 1920. Serial No. 366,818.

One object of our invention is to provide sound transmitting means for talking machines which will include a resonator and amplifier having vibratory portions of such character as to allow all complex sound to find sympathetic or suitably formed vibratory parts which will accurately and discriminately resound and amplify sound waves impinging upon them and thereby reproduce an audible analysis of complex sound. Thus by the use of our present invention on talking machines the sounds of voices, instruments or the like which were originally recorded in the record will be reproduced in such manner as to be readily distinguished one from another without any blurring or false intermingling of sounds which were not originally present or record ed in the record.

Another object is to so construct said means that it can be easily and cheaply made and embodied in a talkingmachine.

These objects, and other advantageous ends which will be described hereinafter, we attain in the following manner, reference being had to the accompanying drawings in Which Figure 1 is a top plan view showing sound transmitting means made in accordance with our invention and illustrated in connection with a portion of a cabinet of a talking machine,

Figure 2 is a sectional elevation taken on the line 22 of Figure 1,

Figure 3 is an end View illustrating our invention,

Figure 4 is a side view of one of a num-' ber of sections of an amplifying resonator which forms a part of our invention,

Figure 5 is'a top plan view of Figure 4,,

Figure 6 is an end view of Figure 4,

Figures 7 and 8 are perspective views of certain of the elements of our invention, and

Figure9 is a fragmentary section taken on the line 9-9 of Figure 2.

Referring to the drawings, 10 represents a talking machine cabinet which may be of any suitable construction providing a chamber 11 and having a rear board 12, and a front board 13 which is provided with an opening 14:.

We provide a block 15 which may be made from a piece of wood square in cross section as shown in Figures 1 and 7 and downwardl through this block is bored a passage 16. his passage can be bored with a drill bit having a lower chamfered end so that the end of the bit will produce a beveled surface 17 above the bottom 18 of the block 15. Another passage 19 is drilled into the front face 20 of the block and this passage can be drilled with the same bit which is used for the passage 16 and at right angles to the passage 16 as clearly shown in Figure 2; the bottom of the passage 19 beingcoincident with the bottom of the passage 16; the passages 16 and 19 joining each other in the manner of a cylindrical intersection. The rear of the block 15 can be glued or otherwise suitably secured to the rear board 12 of the cabinet 10. An extension 21, which may be made of a block of wood square in cross section, is glued or otherwise suitably secured to the front face 20 of the block 15 and this extension 21 has a flange 22 in the form of a flat projection which engages the bottom of the block 15 and extends to the rear board 12 of the cabinet. The extension 21 has a bore 23 which is preferably made by a drill bit of larger diameter than that used to make the passages 16 and 19 and the drill bit used for the passage 23 is also preferably provided with a chamfered end so as to provide a beveled portion 24 of the passage 23; the smallest diameter of said bevel portion being substantially equal to the diameter of the passage 19 and in axial alignment therewith. The forward part of the passage 23 flares outwardly as shown at 25 and the outer surface of the extension 21 adjacent the forward end thereof is turned to form a recess 26 which is circular in cross section and which tapers rearwardly and intercepts a forward surface 21 of the extension 21. An amplifying resonator 27 flares outwardly from the extension 21 and is so constructed as to have parts of different elastic resistance for co-ac-ting with sound waves and we have illustrated one manner of producing an amplifying resonator having said latter mentioned characteristics. in the present instance said resonator is made up of tour sections 2 25). ll) and 31 ot resonate wood. Each of these sections is cut out of a block of wood into the shape shown in Figures 5 to c inclusive in such manner that they llare forwardly from the ends 32 to the ends 33. Furthermore the sections are arcuate or curved in cross section both on the outer and inner surfaces and are thus rendered hollow and comparatively thin as shown in Figure o. The opposite edges 3-1- of the sections thus formed are beveled and these edges are glued or otherwise secured together throughout their lengths so that the parts 85 of each of the sections between the edges 34 bulge outwardly and the internal radius at the end 32 of each of the sections is similar to the radius ot the recess 26 on the block extension 31. The individual sections can he glued with the ends 32 fitting within the recess in so that when all the sections are joined together as above described they will be securely t'astened to the block extension 21 within the recess 26 and since the latter llares forwardly it will be impossible for the resonator to pull away from the for- -ard end ot the extension 21 as is obvious from the showing of l i 'ure 2. Furthermore by havingthe part 25 projecting beyond the surtace 21 the. latter serves as an abutment oi aligning shoulder for sections. Each of the sections 28. 30 and.3i are cut t'roin a bloclr of wood in such manner as clearly shown in l igures 4 to ('5 inclusive that the grain is longest at the edges 34 and extends substantially parallel to said edges 34- so that the laminations produced by the tihersot the gain become shorter at portions between the edges 34 and from the ends 82 to the ends 3.; of each section. Thus each of the sections of the resonator has integral parts which will otter ditl'erent resistance against yielding by sound waves tending to flex them. My shaping the sections and running the grain as above described and as illustrated tl 2 structure will be stitler at the edge portions 2M near the end 32 than at any other portion owing to the greater tension on the longer fibers due to the extended adhering contact with adjacent fibers. From said portions outwardly from the end 32 and a way lrom the edges 34 the material becomes less stilt owing to the gradually increasing cross sectional arc and gradually shortcning libtrs.

With the above construction the amplifyingg resonator will be securely held at its rear portion only and will need no further support and in this manner it is practically tree to vibrate at any portion t'orward of its -onnection with the extension 21.

ii'e have described the resonator being composed of wood. However, it Will be understood that it desired this reso 1' may he made of other material which has parts which will function similarly to said wood. For example it may be made of a material which is composed of laminations of similar character to the fibers or layers of wood constituting the grain of the latter as above employed.

A resonator made in accordance with the above instead of focusing the sounds in one spot distributes the tone waves in a large radius and gives the impression that the sounds pass outwardly therefrom instead of producing the sensation that they are produced on the inside of the resonator as is usu ally the impression given by other resonators made prior to our invention.

In the use of our invention the top of the block 15 may be connected in any suitable manner with a tone arm of a talking machine so that the sound transmitted will pass downwardly through the passage 16 thence through the transverse passage 19 and passage 23 into the amplifying resonator 27. The construction of this resonator as previously described is such that ithas portions of different resistances against vibration so that the various length sound waves durin their passage through the resonator will find a sympathetic or suitably vibratory portion according to its resistance Within the substance of said resonator. In this manner as previously set forth in the objects of our invention a reproduction of the sound Will be effected in such manner that there will be no blurring or merging of the sounds and a correct reproduction of a record will be produced.

ll e preferably utilize two or more pairs of sections in constructing the resonator so thateach pair includes the outwardly bulged sections which are oppositely disposed and as illustrated We have employed four sections or in other words two pairs of sections and in this manner similarly constructed sections will be opposite each other and arranged annularly around the longitudinal center or axis of the resonator. F or example we preferably use a resonator including two, three or more pairs of the sections; each pair having its outwardly bulged portions oppositely disposed.

While we have described our invention as taking a particular form, it will be under stood that the various parts of our invention may be changed without departing from the spirit thereof, and hence We do not limit ourselves to the precise construction set forth, but consider that we are at liberty to make such changes and alterations as fairly come within the scope of the appended claims.

Having thus described our invention, What we claim as newand desire to secure by Letters Patent is 1. A sound amplifier made of elongated sections of laminated fibrous material in which the length of the fibers extend in the direction of the length of the sections, said sections being of arcuate cross section convex on the outer surfaces and concave on the inner surfaces and flaring from one end to the other whereby th cross sectional arc in creases from one end to the other, the fibers of the sections being longest at the side edges and becoming gradually shorterfrom portions between the side edges of each section adjacent the narrow end toward the wide end, said side edges of the sections being connected together; substantially as described.

2. Sound amplifying means including supporting means having a sound conducting passage leading out through one end,

said end at its outer surface being circular in cross section; and a resonator made up of members which flare outwardly, the members at their narrow ends being of arcuate cross section having a common center and fitting concentrically around said surface of said end of the supporting means, said members beyond said small ends being curved to g means immediately in front of said shoulder, said members beyond said small ends being curved to form a substantially lobed cross section; substantially as described.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

' HARRY J. DURBOROW.

BAYARD L. WINDERS.

Witnesses:

ANNA BENTON, CHAS. E. Po'rrs.

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