US 1759610 A
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May 20, 1930. G. H. FISHER I 1,759,610
RADIO RECEIVING SET Filed April 16, 1925 I Patented May 20, 1930' UNITED STATES PATENT oFFicE M GEORGE H. FISHER, OF NEW YORK, N. Y.,
ASSIGNOR TO BELL TELEPHONE LABORA- TORIES, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK RADIO RECEIVING SET Application filed April 16, 1925. Serial No. 23,467.
This invention relates to a radio receiving Referring particularly to Fig. 1, the main set with a novel arrangement for mounting a direct-acting loud speaker associated therewith.
An object of this invention is to provide a self-contained radio set comprising both the receiving and the loud speaking apparatus. Further objects are to provide portability, flexibility, compactness, and protection for all of the apparatus.
Another object is anovel type of direct-act ing diaphragm. I
In general, this invention comprises radio receiving apparatus and a direct-acting loud P speaker such as the cone type compactly con-- tained in a cabinet so designed that when in operation the cover of the cabinet may be opened to expose the direct-acting loud speakerin the desired position for operation. A
1: form of loud speaker diaphragm which may advantageously be used in accordance with the invention is one of pyramidal shape.
Where a loop type antenna is to be used the invention also provides for mounting itin the cover of the cabinet so that it is also p" sitioned for use by opening the cover.
In accordance with a specific application of this invention, the pyramidal or cone type loud speaker is located, together with the loop antenna, in the cover of the. cabinet housing the radio receiving apparatus. The mounting of the various parts results in an arrangement which is pleasing in appearance,
I is compact and makes for convenience and efficiencyin operation, since the parts can be quickly adjusted to the position in which they give themost satisfactory operation and whennot in use'they are stowed in. a small space and are protected from injury, dust,
etof i I Y Referring to the drawings, Fig. 1 is a general assembly view of the set open for op-' oration, this embodiment employing the pyramidal form of loud speaker. Figs. 2 and 3 are top views of the case designed for round and for elliptical conical shaped directacting loud speaker diaphragms, respec tively. I
Similar reference charactersdesignate similar parts in the different views.
portion of the cabinet or case contains the radio recelvlng apparatus. The cover 11 hinged to the mainportion of the cabinet contains thefdirect-acting loud speaker and loop antenna. The front side of the cabinet has two doors l2 and 13 which are open when using the set to give direct access to the tuning or controlling dials shown. The front panel of the radio receiving set is shownat 14 andthe top at 15. l/Vhen the cover 11 and the side doors 12 and 13 are open, complete access is given to all parts of the radioset necessary for its operation and forthe replacement of vacuum tubes, etc. Connection of the antenna and the loud speaker is made with the receiving set at the binding posts 19 is supported by a truncated pyramidal section having its base joined to the base of the front section 19. The rear side of the directacting diaphragm facesthe top of the cover made of open grillework 20 and lined with thin fabric 22, which alfords protection and I shuts out dust and at the same time affords substantially free passage to'sound vibrations. The open work at the top of the cover may be employed where it is undesirable to place the direct-acting diaphragm in close proximity to a solid, back. The diaphragm and its driving element are supported at the rear by means of ring 21 fixed to the grillework or to any other suitable means in the cover of the cabinet. f
' The direct-acting loud speaker may be the cone type, such as described in the Scientific American of December 1924, page 390, with a driving element of the type disclosed in Patent No. 1,365,898 of January '18, 1921 to H. C. Egerton. Figs. 2 and 3, which are top views of the cover, show by the broken lines the mounting ring 21 for supporting the diaphragm and the driving elementpan d the periphery of the diaphragm. Fig. 2 shows adiaphragm having a circular periphery 23 and Fig. 3 one having an elliptical periphery '24. The elliptical diaphragm is eccentrically driven and eccentrically supported as shown by the position of the mounting ring 21 in 7 Fig. 3, the apex'of the diaphragm, and the point to which thedriving element is attached, being directly beneath the center of 'the ring21 as seenin Fig. 3. The direct-act ing diaphragm has arelatively large area and may obviously be rectangular, round or elliptical, as illustrated by the several figures.
The position of the cover 11 when open is secured bymeans of the rod 25 and the screw 26, which aifords'means of adjusting it at any desired angle of opening. 7 V
It is to be understood that the invention is not limited to the specific structures described and illustrated since many modifications within the scope of the appended claim may be made'without departing from the spirit'of the invention.
What is claimed is: A rad o receiving set comprising a cablnet, radio recelving apparatus mounted therein a hinged cover for said cabinet,. a grille forming the surface of said cover,-a' directacting diaphragm mounted on said grille with its main radiating surface facing the inside of said cabinet, and substantially dust 'proof fabric mounted over said grille for protecting said diaphragm and said apparatuswhen the'cover isclo'sed.
. In witness whereof, I hereunto subscribe V myname this 13th da of April, A. D; 1925. r RGE H. FISHER.