US 2511917 A
Description (OCR text may contain errors)
June 20, 1950 A, P, HORNOR 2,511,917
SELECTABLE LOUDSPEAKER-EARPHONE SOUND SYSTEM Filed Oct. 3l, 1946 I INVENTOR urehus P. Hafner ATTORN EY Patented June 20, 1950 SELECTABLE LOUDSPEAKER-EARPHONE SOUND SYSTEM Aurelius l?. Hornor, Montclair, N. J., assigner to Thomas A. Edison, Incorporated, West Orange, N. J., a corporation of New Jersey Application October 31, 1946, Serial No. 706,868
This invention relates to a sound-receiving system wherein the sounds may be received directly from a loudspeaker or in private from an acoustical-type earphone, and it relates especially to such acoustical receiving system wherein the speaker is shut off automatically while the earphone is in use.
An object of the present invention is to provide a simple and economical means whereby a transcriber of dictation or other recorded matter may receive the reproduced sounds selectively from a loudspeaker or from an earphone, and wherein one of the receiving units is disabled automatically as an incident of using the other.
It is a further object to provide a selective sound-receiving system of the character mentioned which includes a support for holding the earphone while the latter is not in use and means whereby the loudspeaker is automatically shut oz' and opened to the outside air as the earphone is removed from and placed on its support.
These and other objects and features of my invention will be apparent from the following de-` scription and the appended claims.
In the description of my invention reference is had to the accompanying drawings, of which:
Figure 1 is a diagrammatic view illustrating my invention; and
Figure 2 is a fractional sectional view, taken substantially in a plane on the line 2-2 of Figure 1, showing details of my invention.
While my invention has general application in acoustical systems for receiving sounds either from a loudspeaker or privately from an earphone, it has particular utility in connectionk with the transcription of recorded dictation and other recorded matter and is therefore hereinvillustrated and described in connection with a phonographic transcribing machine I fractionally shown in Figure 1. This machine is well known in the art and is sufficiently described for the present purposes by the statement that it comprises a rotating record Il bearing the recorded matter to be transcribed, an electricaltype record-cooperating translating device I2 and an electrical amplier i3 for amplifying the sound-representing electrical currents generated by the translating device. From this amplifier these currents are fed by a cord Hi to the soundreceiving system of my invention.
This sound-receiving system comprises a loudspeaker !5 connected to the amplifier I3 by way of the cord just mentioned. This speaker is mounted in a cabinet I5 which is closed at all sides except at the front of the horn l1 of the 6 Claims. (Cl. 181-18) speaker. At this front side there is mounted a' shutter I8 which' is adapted for enclosing the speaker so that it cannot radiate sound to the outside air. This shutter comprises a vertical grill I9 having rearwardly-bent border portions 20 that fit into the cabinet and are secured thereto as by screws 2l. The grill is provided with a series of horizontal vertically-spaced openings 22 each of which is surrounded by a rearwardlyprojecting rim 23 formed integrally with the grill. Pivoted to the grill at a point 24 below each opening is aclosure plate 25 for the respective opening. These plates have linings 26, such as of felt, provided on their faces which confront the openings so that when the plates are swung forwardly they will engage the rims 23 and tightly close the respective openings against the escape of any sound from the speaker to the outside Mounted on the grill at, for example, the bot- 1 tom portion thereof there is a sound-receiving cap 29 for picking up sound from the horn of the speaker by way of an opening 3U in the grill. 'I'his cap has a nipple 3| connected to a iiexible f sound-transmitting tube 32 which leads to two. acoustical-type earphones 33 of a headset 34.,A This headset includes a flexible band 35 which.
interconnects the earphones to hold them in place on the head of the user. This is a standard form of acoustical-type headset commonly used by transcribers in reproducing recorded dictation.'v
This type of headset has an advantage over electrical-type headsets in that it is very small and light and not so much annoyance to the user.
When the shutter is closed, the sounds radiated from the speaker are picked up by the receiving cap 29 yand transmitted eiciently by the v tube `32 to the earphones of the headset 34. The
3 ter is closed automatically when the headset is in use and is opened to enable direct reception from the speaker when the headset is not in use. To meet this objective I provide a hook-shaped support 3B for holding the headset when the same is not in use, which is an integral part of the control member 28,'t-he'control` member having.
for example an upward portion extending through an opening 31 in the top wall of the grill and then extending laterally to form the support," When the headset is removedfrom. this support. the spring 28 just holds the shutterv suitably"l closed. When the headset is mounted on the support, however, the weight thereof is sufficientto overcome the force of the`I spring 2:8' and to' move the shutter open. Since it is a normal'un-- conscious act on the part ofthe. transcriber` to mount the headset on this support when it is not to be used, and toA pick up the headset from= the support when it is to'be used, it will be undern stood@A that the presentY sound-receiving system. isfcontrolled automatically for t-he'selectivere-- ception ofthe reproducedsoundfromthe speaker or headset without. requiring any'special manipelution on the partof the user.
, The particular embodiment of my' invention' hereinabove shown and describedzis intended to`v be illustrative andI not necessarilylimitative of my invention, since the same isfsubjecttochanges' and modiicationsy Without departure from the scope of my invemonwhich I'. endeavor toexpress-according. to the following claims;
1.,. A system for receiving soundsl directly from afloudspeaker or privately fromanacoustical type ofvearphone, comprising meansfor enclosing saidfv speaker, asupport tor holdingsaid earphone when the; same is not in use, asound". transmitting tubey connecting said earphone to said enclosing meansy to couple the earphone acoustically to said speaken. and means associated with said .support and operatively coupled to-.said enclosing means for causing.v saidv speaker: tof be enclosed while said earphone is removed from said support: and to be open to the outside'air when. said. earphone is on said support.
21... Alsound-receiving., system comprising a loudspeaker.,` a sound closure connected to said speaker and including a movable shutter. forv closing. off` radiation of sound from the speaker to the outside air, an acoustical-type earphone,r ai sound,- transmitting tube connecting .said earphone tov said closure to couple the earphone acoustically to.- said speaker, a support for holding said ear phone when the latter is. not inuse, andmeans biasing. said shutter closed. andv responsive tov said earphone as the-same is placedonto said support for openingsaid shutter.
A3.. A system for receiving. sounds directly from.
a, loudspeaker or privately from. an acousticaltype earphone, comprising a. cabinet for saidk speaker, a movable shutter .on saidcabinet .for
closing,y oil?v said' speaker from the outside air., a
means coupling said support to said shutter, and
spring` means for holding. said shutter 'closed and said support in a raised position when said earphone is removed from the support, said spring meansbeing adapted to be overcome by the weight of said earphone on said support to cause said shutter to be openedas the earphone is placed onto the support.
4; Ina system for receiving sounds in public from a loudspeaker or in private from an acoustical-type earphone: the combination of a sound closure connected to said speaker to form a closed air chamber. therewith and to prevent radiation offsoun'd to the outside air, said closure including an openable shutter; a sound-transmitting tube connecting saidearpnone to said'chamber; a support for said earphone mounted for vertical movement and'vr biased into a raised position, the biasing force exertedfon said support being overcome by the weight of said earphone when the latter isi'placed thereon; and means coupling said shutter to said support for holding said shutter open to' enable saidl speaker to radiate sound tol the oultiside` air when said earphoneA is on said sup` po 5. Ina soun`dreceiving system adapted to enable the reception of sound in public from aspeaker orv in private from' an acoustical-type earphone: the combination of a sound closure connectedto said speaker to form a sound chamber therewithi a sound-transmitting tube coupling said earphone tof said sound chamber; a
shutter on said sound closure openable to' permit' radiation of sound by said speakery to the outside air; a movably mounted support for said earphone movedy in' one direction as said earphone is mounted thereon' and in the otherdirection as saidearphone isl removed therefrom; and means couplingl said shutter to said support for causing the shutter to. be opened and closed respectively assaid4 earphone is` placed on and removed from said support.
6. A sound receiving system' comprising a loudspeaker, closure means including a movable shutter'foracoustically shutting oif said speaker from the outside air, an. acoustical-type earphone, a sound-transmitting. tube connecting said earphone to 'said' closure means to couple the earphone acousti'cally to' said speaker, a support mounted for up-and-down movement and adapted forl holding said earphone when the latter is not in use, means coupling said shutter to saidl support, and a spring yieldably holding said shutter closed and said support raised when said earphone is removed from the support, said spring being adapted to be overcome by the WeightV of said earphone on saidsupport to open said shutter automatically as the earphone is placed on the support.
AURELIUS P. HORNOR.
Number Name Date 1,235,695- Johnson Aug. 7, 1917 1,283,510 Heck NOV. 5, 1918 2,035,473 Harrison Mar. 3l, 1936