US1604655A - Sound reproducing and transmitting apparatus - Google Patents

Sound reproducing and transmitting apparatus Download PDF


Publication number
US1604655A US5021A US502125A US1604655A US 1604655 A US1604655 A US 1604655A US 5021 A US5021 A US 5021A US 502125 A US502125 A US 502125A US 1604655 A US1604655 A US 1604655A
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transmitting apparatus
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Expired - Lifetime
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Charles H Millward
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Charles H Millward
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Priority to US5021A priority Critical patent/US1604655A/en
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Expired - Lifetime legal-status Critical Current




    • H04R11/00Transducers of moving-armature or moving-core type
    • H04R11/08Gramophone pick-ups using a stylus; Recorders using a stylus


Oct. 26 1926.
Application filed January This invention relates to combined radio and .phonographic apparatus, and has as one of itsobjects the provision of a head or sound reprodueer which may be substituted.
A further feature is to produce a head or I sound box. that may be attached to the usual type of tone arm, and provided with a needle or stylus, operable in connection with the record when the same is played, to create a new record, or allowed to remain in disuse when sound waves are received from the radio receiver.
Another aim is to so combine these means as to use a single diaphragm for both purposes indiscriminat-ely'and without changing the instrument in any manner, the sound box being of simple construction, inexpensive to manufacture and easy toapply.
These and other similar aims and objects are accomplished by the novel construction and combination of parts hereinafter de-' scribed and shown in the accompanying drawing, forming a material part of this disclosure, and in which Figure 1 is a side elevational view of an embodiment of the invention as applied to a conventional type of tone-arm. Figure 2 is an enlarged transverse sectional view, taken substantially in a plane indicated by the line 2 -2 of 1,. l
, Figure 3 is a rear plan-view of the same, parts being broken away to show the construction.
The invention as shown in the drawing, is composed of two main elements one of which, generally designated by the numeral 10, is shaped to present a disc 11 having a hub 12 bored to'receive the end of a tone: arm 13 held in position by a screw 14:.
The inner surfaceof the disc is finished smooth. and level and at its'edge is an an-- nular flange l5, screw-threaded internally to receive corresponding screw threads 16 formed on the outer surface, near the end of the cylindrical portion 17 of a cup 18 having a bottom or base 19, as best shown in Fig. 2.
. that the single 27, 1925. ser al No. 5,021.
A soft iron ring 20 having a circular openmg 21, its sides being flattened as at 22, is fitted to the cup and held on its bottom 19 by rivets 23. I
A pair of magnets 24 have their cores 25 bent outwardly at right angles, forming feet 26 set in recesses in the cup'bottom l9 and are .held rigidly by the rivets 23, below the ring 20.
Above the feet are non-conducting plate 27 one for each magnet, and on extensions of these plates are secured metal clips 28 to receive electric terminals, not shown, entering through openings 29 in the wall 17, and by which eurrentcan be conveyed from a radio apparatus.
These clips are in electrical communication with the coils'30 of the magnets, and
held in place by-insulated magnet heads 31.
through which the cores 25 sllghtly extend.
A diaphragm 32 of any preferred material as mica, glass, paper or metal, is
clamped between cushion rings33 and. 34, 76
adjacent the disc 11, when the cup 1.8 is secured into the flange 15.
If the diaphragm is made of glass or other nonconducting substance, an armature. 35 is secured, to the underside of the diaphragm, adjacent the magnets, a similar disc 36 being disposed on the outer side of the diahragm, these elements being held rigidly y a rivet 37 ,.the same securing apad 38 to the diaphragms.
This pad .is formed'at the free end of a bent lever 39, the lever passing through an {opening 4O- in the hub 12, and being attached to an arm 41' formed on a head 42, pivoted between the points of screws, 43 set in lugs 44a extendingout fromthe flange 15 and secured in adjustment by lock nuts-45. y Extending outwardly from the head 42 is a socket 46, provided with a thumb'set screw 47 to clamp a needle 48 in operative position in the .socket, to be actuated by a record in the usual manner.
From the fore oing, it will be understood diaphragm employed in v the structure is used indiscriminately for both the phonograph and radio, as is also. the loud speaker forming part of the usual phonograph equipment, without any changes whatever.
'ters Patent, is
When used to reproduce the sounds of a record, the needle is secured in the ordinary manner to play the record and the sound transmitted by the diaphragm to the horn or other loud speaker employed.
if the device is to be used to transmit sound from a radio apparatus, suitable connections are made with the clips 28, and the record disc and needle removed.
It will also be apparent that when so connected, the needle or stylus, actuated by the vibrations of the diaphragm, caused by sound waves imparted by the radio, can be used to create new records of the sound thus produced, thus correctly reproducing the sound waves received from a radio apparatus, preserving the same indefinitely.
Although the foregoing is descriptive of the preferred embodiment of the invention, it will be apparent that minor changes may be made in its construction, without the exercise of invention or conflicting with the scope of the claims hereto appended;
Having thus described my invention, what I claim as new and desire to secure by Let- 1. A sound reproducer having a single diaphra m and means to actuate said diaphragm y either magnetic impulses. applied to one'side or direct mechanical contactapplied on the opposite side.
casing, and fixed mechanical connections, be-
tween said socket and the ote side of said diaphragm.
4. A sound reproducer comprising a cup shaped casing, a cover engaged over the easing, said cover having a hub adapted to be secured to a support, a diaphragm clamped between the edges of said casing and cover, a magnet fixed in the casing, said diaphragm acting as an armature for the magnet, electrical connections to said magnet, and a pivoted needle actuated lever in fixed operative contact on the opposite side of said diaphragm.
5. A sound, reproducer comprising a casing having an extending hollow hub, a diaphragm mounted in said casing, magnets in said casing adapted tovibrate said diahra m electrical connections to said ma 1: 7 z:
nets, said connections passing through the wall of the casing, a needle holding socket pivotally mounted on said casing, and a lever arm on said socket, said arm passing into said hub-and being rigidly connected to the diaphragm at the center thereof on the side opposite said magnets.
-6. A phonograph reproducer comprising a cup shaped casing, a cover screw-threaded thereover, said cover having means for attachment to a tone-arm, a diaphragmclamped between the edge of said casing and cover, cushion rings interposed between the diaphragm and its adjacent contacting surfaces, a pair of magnets fixed in said casing adjacent the diaphragm, said diaphragm acting as an armature, metal clips in circuit with the magnets, said clips being engageable with electric connections from a radio apparatus, a needle socket pivoted on said cover, and fixed operative connections between said needle socket and said diaphragm on the side opposite saidmagnets.
This specification signed and witnessed this 26th day of January, 1925.1
CHARLES wa nn.
US5021A 1925-01-27 1925-01-27 Sound reproducing and transmitting apparatus Expired - Lifetime US1604655A (en)

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