US1706999A - Radio reproducer - Google Patents

Description

MarchZG, 19291.] w, L, CKHAR 1,706,999;

v RADIO REPRODUCER. v

FileoTJdneil. 1926 2 Shets-Sheet' 1. 1?

2 v LWENTOR.

' M I BY i 30 1 ATTORNEY.

March 26, 1929., w, ECKHARDT I I 1,706,999

I RADIO REPRODUCER Filed June .11. 1926 2 she ts-shet 2 'INV ENTOR.

A T TORNE Y.

Patented Mar. 26, ,1929.

- UNITED sTATEs PATENT OFFICE.

WALTER'L. ECiKHARDT, OF PHILADELPHIA, PENNSYLVANIA.

name nnrnonucnn.

i Application fi1ed June 11,

My invention relates to radio reproducers, and it has for its general object to provide a reproducer of novel construction of a character such that the tones reproduced thereby are clear, resonant, natural, free from blast and without rattle. 1

It is also an object of the invention to pro:

vide a construction of reproducer comprising To theseand other ends the invention com-- prehends the construction and arrangement of parts as hereinafter described in detail,

of Fig. 4.

ments thereof;

particularly pointed out in the claims and as illustrated in the drawings in which I have shown certain forms of mechanical embodi- In the drawings:

Fig. l is a view in front elevation of a reproducer embodying the invention Fig. 2 is a View in transverse section taken in a central vertical plane at right angles to the plane of Fig. 1; r

Fig. 3 is a vertical section of a fragmentary portion of the structure showing a modifica} tion of the means for securing the vibratory diaphragm within the drum or cylinder;

Fig. l. is a view in front elevation of a re producer showin a construction containing a modified-embodiment of the invention;

and

Fig. 5 is a vertical transverse sect-ional' vie'w taken in a plane at right angles to the plane Referring to the drawings,it will be noted that the base comprises aportion l of relatively large size and a portion 2 of smaller size secured thereto and centrally thereof and that to the latter the cylindrical drum shaped member 3 is secured by means of screws 4 and 5. The member 3 in the construction shown is in the form of a hollow cylinder but may be of other shape in cross section. It consists ofwood or of some other material having c0rresponding qualities asto amplification, resonan'ce, etc. The member 3 may be described broadly as a section of a tube of large trans- 1926. Serial at. 115,159.

verse area. It is provided near its front end portion with an inner band 6 also of wood 2 orsimilar material. Located interiorly' of and near the front end of the tubular resonator 3 is a metal bar 10 which extends diametrally of the said resonator. The said bar is provided at its opposite ends with laterally extended projections 11 constituting feetzwhich are seated against the innerside of the lnterior band 6 previously referred to.- The said feet are provided with openings through one of which the screw 5, to which previous reference has been made, extends. The said screw extends not only through the lower foot 11 but also through the band 6 and the resonator 3 into the base of the device: The opening through the upper foot 11 is tapped and a screw 12 extends through openings in the resonator3 and the band 6 and has screw threaded engagement with the said tapped opening. The screws 5 and 12 operate to secure the circular band (5 in place within the resonator 3 and also to secure the vertical metal supporting bar 10 in position.

In addition to the employment of screws 5 and 12 forsecuring theband (5 in place cement may be employed, if desired, between the outer surface of the said band and the inner opposing portion ofthe surface of the resonator 3 as an additional securing means. The front edge of the band (i may be located a short distance inwardly of the front edge of the tubular resonator-3, as is shown in the'drawmgs, so as to provide a circular groove between the front edge of the band Figs. 2, 3 and 5 of the drawings. This band forms. with the inner edgeportion'a groove forthe reception of a elrcular wire frame 20 upon which is mounted a fabric 21 of silk or other suitable material. The inner portion of the said fabric is connected to a ring frame portion 22 located concentrically of the tubular resonator 3. "The portions 20,

21 and 22 constitute a closure .forthe rear end.

of the resonator 3. I

In the several forms ofconstruction a diaphragm 23 is provided of suitable thin sheet material, such as paper, parchment or the like. The diaphragm is tapered from a circular line near its outer edge toward the rear of the reproducer where it is connected with the rear 'end of'a rod 25, commonly called a reed, the front end of which is connected to the vi- 1 bratory element of a loud speaker or reproducer unit 26 mounted upon the metal-bar 10 previously referred to. The usual line wires 27 are connected with the said unit. The outer portion of the vibratory diaphragm terminatesin a rearwardly and laterally extending flange-like portion 28-.

Referring to Figs. 1 to 3 of the drawings,

it will be noted that the inner edge of the band 6 is tapered from its innerside outwardly, as indicated at 30, and that the front side of the outer edge portion of the flange 28 is seated against the surface of the said tapered portion.

In the construction as shown in Figs. 1 and 2 of the drawings the outer edge portion of the flange 28 is secured to the inner edge portion of the band 6 by means of cement, as indicated at 31. It has been found that when the diaphragm is secured to the front edge of the band 6 in this manner the device operates with entire satisfaction and that the fastening is durable.

In Fig. 3 of-the drawings I have shown a 3 construction in which the outer edge portion ofthe flange 28 is held against the inner edge of the band 6by means of a retaining ring 33 of wood or other suitable material which is fastened in place by means of screws 34 which extend through the said ring and through the outer edge portion of the flange 28 into the band 6.

. In Figs. 4 and 5 of the drawings I have shown a construction in which the vibratory 'orbeveled, as indicated at 37. The rearwardly inclined flange portion 28 of the diaphragm 23 is seated against the rear side of the said flange and is secured thereto by cement 38 or by any other suitable means. The diaphragm supporting frame 35 issecured to the metal bar.10 by means of headed bolts 39 the front ends of which are threaded and are in engagement with tapped openings provided in the bar 10 near its upper and lower ends.

The only difference between the bar 10 shownin'Figsml and 5 and the corresponding bar in the preceding figures of the drawingsis that in said Figs; 4 and 5 the said bar its feet 11 extending toward the front instead of the drawings.

It will be noted that the only'essential (life of toward the rear as shown in Figs. 1 and 2 ference between the constructions shown in,

Figs. 1 and2 and 4 and 5 is that in the former the outer peripheral portion of the flange 28 is secured directly to the band 6 and conse quently to the drum 3, whereas in the latter Figs. 4 and 5, the peripheral portion of the diaphragm is secured to a frame 35 which in turn is mounted upon the opposite end portions of the diametral bar 10.

It will'be noted that in the construction shown in Figs. 4 and 5 the portion .1 of the base is of somewhat greater length than the corresponding portion in Figs. 1 and 2 of the drawings. The purpose of lengthening the portion 1 of the base in Figs. 4 and 5 is to permit ofthe' mounting of upright posts 40 upon the outer ends thereof the upper ends of which are provided with heads 41 which are located upon the opposite sides of the tubular resonator 3 1n diametral relation with respect to each other.

These heads are provided with short projec tions 42 which contact with and are secured to the said resonator for the purpose of constituting an additional support and steadying means therefor. The posts or columns 40 consist of wood or other suitable material.

It may be noted that the rear end of the reed 25 may be connected to the diaphragm 23 at its apex in any known manner.

It also may be noted that the front and rear closures of the tubular resonator 3 may be inserted and'withdrawn at will, the said closures being retained in place by friction of the peripheral surfaces thereof with the inner frongt and rear edge portions of the resona- While the tubular resonator 3 and the band 6 preferably consist of wood it is to be understood that these parts may be constructed of any other suitable non-metal material possessing therequisite qualities of resonance 21nd other characteristics previously referred By the employment of my invention I am enabled to construct radio reproducers which not only are very efficient for reproducing sounds having the characteristics and qualitics already indicated, but which also are ornamental in highdegree.

Having thus described my invention, what I claim and desire to secure by Letters Patent 1s:

material of tubular form and a band secured within one end of the said section, a bar extending diametrally of the said resonator and secured thereto at its opposite ends, a reproducer unit mounted on said bar, a vibratory diaphragm having operative connection at its outer edge to the said band, and a connection between the geometrical center of said diaphragm and the said reproducer unit.

2. A radio reproducer, comprising a resonator of wood consisting of a hollow cylindrical member and a band mounted within one end portion of the said member, a vibratory diaphragm having a circular portion tapered from a circular line near its outer edge to an apex, the portion of the said diaphragm be-- yond the said circular line constituting a flange, means for securing said flange to the inner edge of the said band, and means having connection with the said diaphragm at its apex for eifectingvibrations thereof.

3. A radio reproducer, comprising in combination a wooden member of drum shape ineluding a band upon the inner-side of one end portion thereof, the inner edge of which is tapered from its inner side outwardly, a vibratory diaphragm the outer edge of which is secured to the inner tapered edge portion of the said band, a reproducer unit, and aconnection between the said unit and the geometricalcenter of the said diaphragm, substantially as described.

4. A radio reproducer, comprising in combination a resonator of drum shape including a band upon the inner side of one end portion thereof, the inner edge of the said band being inclined rearwardly fromits inner side, a vibratory diaphragm located within and extending transversely of the said resonator the outer edge of which is mounted upon the inner edge of the said band, means for securing the said diaphragm to the said band, a bar extending diametrally of the said resonator and secured at its opposite ends thereto, a reproducer unit mounted upon said bar, and a connection between the said unit and the geometrical center of the said diaphragm,

substantially as described.

In testimony that I claim'the foregoing as my invention, I have hereunto signed my

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