US1245575A

US1245575A - Thermic telephone.

Info

Publication number: US1245575A
Application number: US5962815A
Authority: US
Inventors: Pieter De Lange; Robert Aernout Baron Van Lynden
Original assignee: DE NL THERMO TELEPHOON MIJ NV
Current assignee: DE NL THERMO TELEPHOON MIJ NV
Priority date: 1915-11-04
Filing date: 1915-11-04
Publication date: 1917-11-06
Anticipated expiration: 1934-11-06

Description

P. DE LANGE a; R. A. BARON VAN LYNDEN.

THERMIC TELEPHONE.

APPLICATION FILED NOVA. 1915.

1345,5575 PatentedN0v.6,191 7 7 n! Hi a ili z -1llill l lllllllllllh .z 74

.7nuemors Pie ter de 1.1:: e and F06: fierndut Karon vanzpmbd lowing is aspeci cation.

UETITED STATES PATENT OFFICE.

rm'rmz. n: LAiiGit Min Rosana: AERNOUT BARON van mmnmr, or nrrnaonr. NETHER- LANps, assrdtifoiis To n'AA'MLoozn vmvnoo'rscnar DE NEDERLANDSCHE 'rnnnmm TELEPHOON MAATfiCiiAPPI-T, or UTBEGHT, NETHERLANDS, A COREORATION or mimnnanns.

To all whom it may concern:

Be it known that we, Pra'raa on Lance and RoanRrAaaNoU'rBAnoN VAN LYNDEN, both subjects of the Queen of the Netherlands, and residing at Utrecht, in the Netherlands,have invented a new and useful Thermic Tele hone, of which the fol- Ourxinvention relates to thermic telephones in which the sound is reproduced by means of a heating conductor. The object of our invention is to provide means through which the heating conductor is enabled to stand a comparatively stron load or temporarily even an overload, without burning out 0W1 to overheating. This object we accomplish by arranging a heat discharging body in contact with the exposed sound reducing portion of the heating conductor. en the heatingconductor is of some length, this heat discharging body may simu taneously be utilized to serve as a support for it and protect it against the damagmg influence of vibrations and the like. Inasmuch as it is rendered possible to overload the heating conductor without danger ofburning it out an improved reproduction of sound is attained as compared with what would be attainable with the same apparatus but withouta heat discharge.

Reference is to be had to the accompanying drawings in which we have illustrated by way of example, an embodiment of our invention. Figure 1 shows a thermic telephone in elevation, partly in section, drawn to an enlarged scale, Fig. 2 is a detail view of the support for the heating conductors. The'telephone shown is designed to be directly introdii t'ed into the auditory passage of the hu n ear. It comprises a tubular casing 1 provided with a sound opening 2 at the top and closed by a plug 3 screwed into a thread 4 at its bottom. In the illustrated example, the heating conductor consists of an'arched heating wire, the exposed portion 5 of which serves as sound emitter. Its branches 7 are fixed in a sup ort 6 of insulating material, and connected to the current conductors B and 9.

The heating conductor 5, 7 and its support '5 are covered by a cap 10, the interior 11 Specification of Letters Patent.

THEM/no TELEPHONE.

A a iieati'an flledfievembtr 4, 1915. Serial No. 59,628.

of which forms the sounding cnameel and communicates through an opening 12 at. its top with the sound opening 2 of the casing 1. The upper part of cap cents against an annular flange 13 of casing 1 while its base abuts against a flange it provided on the heating conductor support 6. The support 6 and the cap 10 are secured in place within the casing 1 by means of the screw plug 3 which presses against the support 6.

The heat discharge body 15-, according to our invention, is in contact with the ex posed portion 5 of the heating conductor. It must possess suflicient heat capacity to effectively cool the wire 5, 7 when it becomes heated by current passing through it. On

the other hand, there must be no danger of shortcircuiting by the discharger. The heat dlscharger 15 is either made of a semi-conductor, such as marble; or of a conductor such as metal, coated with a layer of in-.

sulating material.

In the example illustrated. the heat dis charger 15 rests upon two studs 16 on which it is held by screw nuts 17. The studs 16 are fixed to the heat conductor support 6. As the discharge! 15 is able to rc- :ive rn paratively great amounts of heat aid, 0\ ng to its large area, to discharge them rap 51y, a continuous and cilicient cooling action on the heating conductor is secured even with considerable loads of comparatively long duration.

\Vith a heating conductor consisting of a plurality of heating wires, the cooling may be efiected either means of a single heat discharger common to all the heating wires, or by means of a plurality of heat dis chargers, the number, shape, and manner of arrangement of which has no bearing on the scope of our invention.

We have found by tests that the action of a heating conductor coiiperating with a. discharger in contact with its sound emitting portion is not affected as compared with the action of a heating conductor without a discharger. It follows that our heat diecharging device has no unfavorable influence whatever on the operation of the telephone.

It is obvious that our invention is not limited to the precise structure illustrated,

in which various modifications may be made without thereby involving any departure from our invention.

I'Ve claim:

1. In a thermic telephone, the combination of a heating condi'ictor with a heat discharger in contact with the sound emitting portion of said heating conductor.

2. In a thermatic telephone, the combination of a heating conductor, a heating conductor support, and a heat discharger, said heat diwzharger being secured upon said support in a position in wliichsaid heat discharger contacts with the sound emitting portion of said heating conductor.

2. In a tlierniic telephone,;1the combination'of a heating conductor, a heating conductor support,'a pair of studs mounted upon said support, and a heat discharging hody secured upon said studs so as to be in contact with the sound emitting portion of said heatin conductor.

4. In a tiermie telephone, the combina- 'tion of a heating conductor With a heat discharging body made of a semi-conductor, said heat discharging body being held in contact with the sound emitting portion of said heating conductor.

5. A thcrmie telephone, comprising in combination, a heating conductor, a support for said heating conductor, a heat discharger held in contact with the sound emitting portion of said heating conductor, means for supporting said heat discharge-r upon said support for said heating conductor, and a mounting for said latter support.

6. A thcrmic telephone comprising a heating conductor and a heat-discharging body having a non-conducting surface in contact with the soundemitting portion of said heating conductor.

In testimony whereof, we have signed this specification.

PIETEB as LARGE. ROBERT amour BARON VAN LYNDEN.