US1537347A - Loud-speaking telephonic apparatus - Google Patents

Description

May 12, 1925.

1,537,347 E, A. GRAHAM LOUD SPEAKING TELEPHONIC APPARATUS Filed June 30, 1924 2 Shoots-Shut l May I2, -T925.

E. A. GRAHAM LOUD SPEAKING EELZPHONIC APPARATUS 2 Sheets-Sheet 2 Filed June so, 1924 IT? enter mam/Madam M 14ml,

fittorneys "Patented May 12, 1925.

sputum) Amnnn' oneness. or snooscrnv, Lennon, EEGLAHI),

LOUD-SPEAKING TELEPliGNIC APPARATUS.

Application filed June 30, 1924. Serial No. 723,383.

'1 all whom it may concern.

Be it known that I, EDWARD ALFRED Gee- HAM, a subject of the' King of Great Britain and Ireland, residing at Brockley, in the county of London, England, have invented Improvements in or Relating to Loud- Speaking Telephonic Apparatus, of which the following is a specification.

This invention has reference to portable 0 loud speakin telephonic apparatus and it has for its o ject to provide apparatus of this type th'at can be easily transported from place to pltce and conveniently used in the open air inxponnection with wireless receiv- 5 ing apparatus, as for instance boating and other parties, like.

For this purpose, portable loud speaking telephonic apparatus according to the-1nvention, comprises a case having one or more movable si'des'or doors and it may be a movable top or cover, and a loud speaking telephone comprising a telephonic receiver and a sound conduit or resonating box or chamber the mouth or sound emission aperture of which is adapted completely to occupy the opening, or one of the openingsnormally closed by a movable side or door, when the loud speaking telephone is not in clubs and the The case may be provided with support ing means capable of being attached to and detached from the case, or hinged or jointed thereto. and whereby the case with loud speaking telephone can ,conveniently be erected rand supported in position for use "and which c'an b i ren'ioved from, or folded up against the case for storage or transport.

The loud speaking telephone may be adapted foslide in the case, so that it can be withdrawn, Wholly or partly, through the opening at the front of the case, or through an opening at the back of the case, to permit of adjustment of the telephonic receiver. Or the case may be provided with a hinged or removable top or cover to admit or": the combined telephonic receiver and the attached sound conduit or resonating box or chamber (hdrcinafter called the sound conduit) being readily inserted in the'case from above and of the telephonic receiver being afterwards'readily adjusted, when desired, without removing it and the sound conduit from the case. Or, for these purposes, the

case may be provided with a hinged or reby picnic,

movable side wall or door. Or, adjustment of the telephonic receiver may be effected through an aperture in one oi. the side walls, or the'top of the case.

The end cover of the case opposite the sound emission end or the sound conduit may he hinged to the top of the case so that it can be turned upward and, if desired, folded backward'against the top of the case. Or it may be hinged to one side of the case, so that it can be turned outward and foldedv backward against the said side of the case. The case is provided at one side, or it may be at the top, with a handle by which it can conveniently be carried.

In constructions of apparatus of the kind referred to, the case, which may be covered with leather, after the manner in which cameras are so covered, and be of rectangular shape, may be adapted to admit of its being conveniently supported in position for use. For-this purpose it maybe provided on its underside wit. a screw threaded socket to which a folding tripod or other stand can be attached. Such tripod or other stand, when not in use, can be folded up and'placed within the case, it mav be after its folded parts have been secured together, as by a clip device, or enclosed within a tubular sheath.

In the eccompanyingdrawings, Fig. 1 is a perspective external view of one construction of loud speaking telephonic apparatus accordingto the invention, complete and ready for transport. Fig. 2 is a plan view of the same in the position it will usually occupy whilst in use, one side of the case of such apparatus being opened to show the in-T ternal parts. Fig. 3 is a perspective view showing the apparatus supported by a tripod in position for use. Fig. 4 is a cross section. of the case of the apparatus with the loud speaking telephone removed. Fig. 5 is a perspective view, to a larger scale than Figs. 1, 2 or 3, of the loud speaking telephone used in apparatus as shown in 1, 2 and 3 and Fig. 6 is a, part sectional plan of such lou-dr speaking telephone. Figs. 7 and 8 are underside views showing modified constructions.

Referring to Figs. 1 to 6, the case 0," which enclosed a loud speaking telephone. is provided with a movable front end wall i) joint-ed by hinges to one of the side walls of the case and arranged normally to close the enlarged end a of the sound conduit of case to whichthe front wall I) and side wall d are hinged and by means of which the case and its contents can conveniently be carried. The arrangement is such that when required for use the case is arranged with its hinged side wall (1 uppermost and the side wall.

with the screw-threaded sockete lowermost,

so that the front wall 6 canbe turned about a vertical axis located at one side of the case, as shown in Figs. 2 and 3.

The sound conduit of. the loud speaking telephone may advantageously be of U shape (we Figs. 2, 5 and 6) and be arranged horizontally within the case a, its outlet end terminating in the flared or trumpet shaped.

open end portion 0 that is preferably of rectangular shape in cross section as shown, and fit s at its extreme front end, the front ,openend of the case, whilst its other and smalleriend portion, which extends'in a forward direction but not to so. great an extent as the larger open end, is bent upward and adapted to carry at its upper end, the tele- 1 phonic receiver k, the diaphragm of which shaped outlet end portion is arranged to be in a horizontal plane when the apparatus is in use (Figs. 2 and 3). The

intermediate portion of the sound conduit is of U shape.

1 According to the construction shown in Figs. 2, 5 and 6, the flared or trumpetc of the sound conduit is of rectangular cross section and made of wood. The intermediate U shaped portion 0 of the sound conduit is of metal end-Where it is provided with an en and of gradually increasing circular cross section area from its inlet end to its outlet larged rectangular portion 0 fitting over the inlet end of the flared or trumpet shaped portion 0 of the said conduit. The upwardly bent inlet end portion 0 of the sound e'onduit, carrying the telephonic receiver h, is of circular cross section. The front outlet, intermediate and inlet portions, 0, c and c of the sound conduit are or may advantageously bejointed together with the aid of interposed material of a non-sonorous character, as 'for instance rubber, so that the several portions shall be acoustically. insulated from one another. The connertion of the horizontally disposed telephonic receiver It to the upper end of the upwardly bent inlet portion 0 of the sound conduit is or may be efiected by the aid of a socket or hollow plug, preferably of rubber or equivalentnon-sonorousmaterial, carried by the teleof a tripod support f and a" handle 9 attached -to that side wall of the" rigidity.

The telephonic receiver it may be pro-- any known or suitable means to the terminals k and socketed ends of the portions 0 and c.

of the sound conduit. I q r,

In some cases, the .said upwardl'y bent inlet end portion c 'of the sound conduit ,to

which the telephonicreceiver IL is attached.

may be formed as a substantial tubula" :e le ment of non-sonorous material, as to. instance rubber of.

vided with 7 whereby its electro-magnetic system can be readily adjusted relatively to its diaphragm. Conveniently, the adjustment may be effected by a screw is, and nut k it may be against the action of a spring, in the manner set forth in the specification of former British Letters Patent No. 15369 of 1915 granted to me.

efi'ectedby a screw or cam and a lever in the manner set forth in the specification of another application. for Letters Patent Serial N 0. 712357 filed by me.

Or the adjustment may be medium hardnessand The loud speaking telephone hereinbefore described may be acoustically insulated as a whole from the case a in which it is disposed, as by the interposition of washers or bufiers m, (Fig. 4) of non-sonorous material, such for example as india rubber or felt, andbe fixed in place by suitable clips or fastening devices, one of which is shown at n in Fig. 4.

By the construction described, a .loud speaking telephone having a relatively long an small dimensions.

The twin conductors 0 (Fig. 3) connected i can, afterjuse of the apparatus has been discontinued, be coiled up and placed Within the case a for easy and convenient trans port, or they maybe WOllDd'llPOll a spring controlled drum mounted within the case. To enable the tripod support f, when shortened and folded up-to be conveniently stored within the i vided with a socket like holder rforthe reception of the head f? of the tripod support with its screw threaded stem j and .wi a bracket 8 to carry'the shortened legs of t is tripod support, a movable spring serving to hold the legs firmly in place.

The bottom of the case a instead of being provided with a screw-threaded socket e for the attachment of clip t expanding sound conduit can be arranged within a case a of comparatively of the telephonic receiver case a the latter is PI'G? a tripod support as "de- 539 41, when the apparatus is not required for use, and for storage or transport.

Or, according to the further modified-coir struction shown in Fig. 8, two legs {may be hinged to the bottom of the case a near to the corner portions thereof at one end of the case and a third leg f be hinged to' the bottom of the case near to the opposite end of the caseand centrally thereof, in such manner that the three legs can be turned up close against the bottom of the case and storage or transport.

What I claim is 1. Portable loud speaking telephonic apparatus comprising a case havin an.opening therein and a movable wal normally closing said opening, a loud speaking telephone comprising a telephonic receiver and a isound conduit, wholly located within said case, the sound conduit having a flared outheld \in position, as by spring clips 4:, for

let end occupyingthe opening in said case, collapsible supportin means adapted to hold said case above t 1e ground in position for use and coacting detachable screw threaded connecting means carriedby the case and collapsible supporting means, substantially as described.

2. Portable loud speaking telephonic apparatus comprising a case one end wall and one side wall of which is hinged thereto, a loud speaking telephone comprising a telephonic receivr and a bent soundconduit, wholly located within said case, the outlet end of said sound conduit being of flaring shape and fitting the endof the case provided with the hinged end wall and the inlet end of said sound conduit bein bent towards .the said hinged side wall and having the telephonic receiver applied thereto.

3. A loud speaking telephone according to claim 1, in which the outlet or sound emission end portion of the sound conduit has one side wall fiat and vertical, the op posite side wall convex and vertical, the top wall convex and extending horizontally and the bottom wall flat and horizontal.

Signed at London, England, this 20th day of June, 1924.

. EDWARD ALFRED eeaizmM.

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