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Publication numberUS786041 A
Publication typeGrant
Publication dateMar 28, 1905
Filing dateJul 17, 1903
Priority dateJul 17, 1903
Publication numberUS 786041 A, US 786041A, US-A-786041, US786041 A, US786041A
InventorsArvid Andersson Lind
Original AssigneeElektromilitara Aktiebolaget
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Vibrator for sound-telegraph apparatus.
US 786041 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

PATENTED MAR. 28', 1905.






UNITED STATES Patented March 28, 1905.




SPECIFICATION forming part of Letters Patent No. 786,041, dated March 28, 1905. Application filed July 17,1903. Seriai No. 165,979.

To all whmn it may concern:

Be it known that 1, Anvrn ANDERSSON LIND, a subject of the King of Sweden and Norway, and a resident of Stureparken 4, Stockholm, in the Kingdom of Sweden, have invented certain new and useful Improvements in Vibrators for Sound-Telegraph Apparatus, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to vibrators for soundtelegraph apparatus. As is well known, the vibrator comprises an eleetromagnet in which one end of the coil is connected with a springcontrolled armature which normally bears upon a contact, but when attracted interrupts the current in the said coil in the same manner as the armature in the galvanic bell. The said vibrator is by means of a key intermittently inserted into the primary circuit of an induction-coil for instance, according to the Morse system the secondary winding of which coil is connected with the telegraphic wires, alternating currents being thus created in the said wires each time the vibrator is caused to operate by means of the key, which currents are perceived as sounds by means of a telephone at the distant receiving-station. In such vibrators it very often happens that the armature, owing to imperfect adjustment or for other causes, is not sufliciently attracted to interrupt the current when the key is depressed. Consequently either no signals at all or incorrect signals are transmitted.

The main object of this invention is to obviate this disadvantage. For this purpose the vibrator is arranged to form the key proper of the apparatus, so that the armature is positively operated at each depression of the key, and thus under all circumstances is caused to vibrate, the subsequent vibrating motion being, as usual, effected by the electromagnet.

In the accompanying drawings the invention is shown applied to a combined telephone and sound-telegraph apparatus specially constructed for use in the army or in other service where the apparatus must be portable and occupy but small space.

Figure 1 is a side view and part longitudinal section of the apparatus. Fig. 2 is a front view of the apparatus. Fig. 3 is an enlarged 5 sectional view of the upper part of Fig. 1. Fig. 4c is a diagram of the circuits.

In a casing or box 1 a dry battery 2 is mounted, provided at its respective ends with terminals 3 and 4:. to an insulating-disk 6 in a supporting-plate 7 in the casing, and a contact-spring 8, fixed to a cover 9, screwed on the said casing, bear against the terminals 3 4. The plate 7 is fixed at some distance from the upper end of the casing, a chamber 17 being thus provided in which the induction-coil 10 is mounted. The cylindrical iron core 11 of the said coil is hollow, and the electromagnet 12 is loosely inserted into the same from the open end of the 6 5 core. The wire of the electromagnet is wound on a cup-like core 13, to the lower end of which is fixed an iron casing 14:, inclosing the said electromagnet. The said casing is scoured to the core by means of a screw 15, the 7 head of which forms a contact-piece. The core 13 is connectedwith one end of the said wire. Between the bottom of the casing 14: and the said screw-head is disposed an insulating-plate 16, and a similar plate 16 is disposed above said bottom and between it and a plate or disk which bears on the lower end of the magnet.

A cap 18 is screwed on the top end of the casing 14 and bears a screw 19 for the adjustment of the springy armature 20, which is fixed on 30 the electromagnet and connected with the other end of its wire. Between the said screw 19 and the armature 20 is disposed a leafspring 21, which is fixed to the cap 18 and bent at an angle, as shown. The spring-ar- 5 mature 20 normally bears upon the free end of the said spring 21. By the said arrangement the armature 20 can be accurately adjusted by means of the screw 19. 22 is an apertured cover screwed on the end of the 9 casing 1.

As will be seen from the above description, the electromagnet, its armature, and the adjusting-screw, which together constitute the vibrator, form a connected whole which is movable in the hollow core of the inductioncoil and can be removed from the same after the screwing off of the cover 22 for inspection A contact-spring 5, fixed 55 or the like. By the said arrangement the vibrator and induction-coil occupy a minimum of space. A spiral spring 23is mounted between the inner wall of the core 11 and the electromagnet. The lower end of said spring 23 bears upon a flange 24 on the inner wall of the said core, and the top end of the spring presses against the edge-f the cap 18. In this manner the spring 23 tends to move the vibrator lines when telephoning is to take place.

than that of the casing 1, lines, Fig. 1. The ends of the secondary winding of the induction-coil are connected with clamping-screws 40 41, forming the line-terminals.

I outward. A cup-shaped push-button 25 is 28, 30, 42, and 43 are contact-springs in a mounted in the aperture in the cover 22. The switching device acted upon by the vibrator cap 18 supports the edge of the said button, (key) and serving to bring the receiver and which is retained in the cover by a flange 26 transmitter out of and into action. The telethereon. When the said pushbutton is phone apparatus and the said contact-springs I pressed inward, it moves the vibrator 12 are not particularly described, as they do not against the tension of the sprin 23 until the orm any part of this invention. head of the screw strikes a contact 27, fixed Fig. 4 shows the electrical connections. in the disk 6 and connected electrically with When the parts are in the position shown in tie spring 5. The core 11 is connected with this diagram, telephonim can take place, a

2 one end of the primary conductor of the inprimary current flowin from the battery 2 duction-coil 10, the other end of which is conthrough contact 28, contact 42, connectingnected with the contact-spring 8 through the spring a, (at the transmitter,) the diaphragm wall of the casing 1. Thus as the head of 6, carbon particles 0, the ring g, the shaft (Z,

the screw 15 strikes the contact 27 a current and the primary circuit of the induction-coil 2 5 will pass from the battery-terminal 3 through 10. When the electromagnet 12 is depressed the spring 5, the contact 27, the screw 15, the for telegraphing, the receiver 34 is brought electromagnet 12, its armature 20, the spring out of action by the circuit 0, 30, 43, and f. 21, the cap 18, the core 11, the primary con- The current through the transmitter is interductor, the wall of the casing-1, and the conrupted at 42. primary intermittent our- 3 tact-spring 8 back to the battery. In this rent flows from the battery 2 through conmanner the electromagnet is excited. When tact 27, core 13, armature 20, contact 21, cap the screw 15 strikes the contact 27 and the 18, and the primary of the induction-coil 10 electromagnet 12 is consequently arrested, nduced cuiients then flow thiou h L, the t e a1 matuic 20, by ieason of its inertia Wlll secondary of the induction COIl and the circontinue to mave downward and leave the cuit e, 30, 43, f, and L.

spring 21, which is stiffer than the spring-y {aving now described my invention, what armature, so that the vibrations of the arma- I claim as new, and desire to secure by Letters ture are initiated, so to say, and under all Patent, is the circumstances will begin, such Vibrations 1. A vibrator for a sound-telegraph appa 4 being then caused to continue by the electroratus, having a guide, an electroma net its magnet so long as the screw l5is held in cona1 mature, and the contact for said a1 matuie, tact with the contact 27. When the button connected to form the key of the apparatus 25 is released, the vibrator and the button are and mounted slidably in said guide. moved outward by the spring 23. Thus it 2. Avibrator fora combined telephoneand will be seen that the vibrator serves also as sound-telegraph apparatus, having a hollow the key of the telegraph apparatus. The non coie tor the induction-coil ot the teleelectromagnet is guided during its movement phone device, an electromagnet, its armatui e, by a projection 32 on the inner wall of the and the contact for said armature connected core 11 engaging a slot 33 in the wall of the to form the key of the tele iaph device and 5 casing 14. mounted slidably in said core.

34 is a casing containing the receiver of the In witness whereof I have hereunto signed telephone apparatus, and 35 is a casing inmy name in the presence of two subscribing closing the transmitter of the saidga marabws. witnesses.

he said casings are carried by tu es or ars w T 36 36 and 37 37, respectively, sliding tele- ARVID ANDERbSOD LIND' l/Vitn esses ERNST SvAN vIsT, ROBERT APELGREN.

38 38 and 39 39, fixed to the receiver and transout a certain distance scopically in tubes the casing 1, so that mitter can be drawn

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2508642 *May 1, 1947May 23, 1950Automatic Elect LabFolding handset
US2686834 *Jul 20, 1953Aug 17, 1954Jay V Zimmerman CompanyToy telephone system
US4272655 *Aug 22, 1979Jun 9, 1981International Telephone And Telegraph CorporationCompact telephone set employing slidable actuated supervision switches
Cooperative ClassificationH04L15/00