US677829A - Electric alarm. - Google Patents

Description

No. 677,829. Patented my 2, lam. M. wEscHr-:n & P. wnLLENHAuPT.

` ELECTRIC ALARM. (Application filedl Dec. 21, 1899.)

2 Sheets-Sheet l.

(No Model.)

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`N0. 677,829. V Patented luly 2,' |90I.

M.WESGHER & P. WLLENHAUPT.' ELECTRIC. ALARM;

(Application led Dac. 21, 1899.) (No Model.) 2 Sheets-Sheet 2.

Uni-TED STATES MAXwEscr-ma AND PAUL woLLENi-IAUPT, or COLOGNE, GERMANY, AssIcNoRs To WALTER RUBEL, oFDUIsBURG, GERMANY.

ELECTRIC ALARM'.

SPECIFICATION forming part of Letters Patent No. 677,829, dated July 2, 1901. Apprenti@ tied December 21, 1899.1 sentire. 741,140. (No meier.)

logne, inthe Province of the Rhine, KingdomA of Prussia, German Empire, have invented a newaud useful Improvement in Electric Alarms, of which the following is specifica-- tion.

Our invention relates to an electric" alarm system by means of which alarm-signals can be'given in different rooms at different times destined a long time before. Te attain this by the system illustrated in the accompanying drawings, in which- Figure 1 is a view of the whole system and a diagrammatic view of the circuits. Eig. 2 is a back view of the clock effecting the closing of an electric circuit. Fig. 3 is an upper view of the parts shown in Fig. 2. Fig. et is a view of a periodically-advancing toothed bar and of the armature releasing this bar. Fig. 5 is an upperA view of the parts shown in Fig. 4. Fig. 6 is an upperview of a circuitcloser provided in each room. Fig. 7 is a front view of the same.v j

In the drawings the system isrepresented for a plan of four rooms, in which every quarter of. an hour alarm-signals can be given.

On the back side of a clock a, Fig. 1, a wheel b, Fig. 2, provided with four teeth, is Xed to the axle of the minute-hand of a double-handed clock. The teeth of this wheel b are adapted to raise the contact-lever c. In raising this contact-lever it is at first pressed against the two spiral springs d and e. These springs are connected with the poles of a battory f, Fig. 1, so that by pressing the contactlever c against these springs d and e the circuit of the battery f is closed. If now the contact-lever c is further raised, it touches the screw g, Figs. 2 and 8, which is connected with one pole of a second'electric battery h, Fig. l, the other pole of which is connected with the axle t', Figs. 2 and 3, around which the contact-lever c turns. In the circuit of the battery f, Fig. 1, an electric magnet-Z is provided which can effect a pivoted armature m. This armature is situated above a toothed bar n, which is moved by means of the weight o. The armature m is provided with a nose on each end which iitsiuto the teeth of the 'toothed bar n in the way of the escapement of a clock. By the up-and-down motion of the armature m,effected by closing and breaking the circuit of the bat-teryfand by the effect'of a spiral spring the toothed bar fn will advance one tooth in the direction in `which it `is drawn by the weight 0. In the toothed lbar n wires y are ixed, so that the ends of these wires project on the back side ofthe same. When the toothed bar fn advances, the projecting ends ot these wires y slide over a yplate or spring p, fixed behind the toothed barn. Hereby itis attained that vthe project-ing ends of the wires successively come in contact with the plate or spring 2J. Now as the magnet is energized every quarter ofan hour the toothed barn will advance one tooth at this time, and therefore every quarter of an hour the end of another wire will come in contact with the plate or spring p. The wires y are fixed with their free ends to pins q, screwed into the board z, upon which the whole apparatus is mounted. These pins q are each provided with the nomination of the time at which the projecting end of the wire aflixed to this pin cornes in contact with the spring or plate p.

In case repeated alarm -signals shall be given-that is to say, in case a quarter of an hour after the first alarm-signal a second signal shall be giventhe plate or spring lo is arranged in that way that it touches two projecting ends of the wires y at the same time. In this case an interrupter must be provided in each room, in order to be able to break the circuit in case the second signal is not necessary. As it wouldbe very troublesome to close the circuit by hand after it has been interrupted, an automatic circuit-closer fr, Fig. 1, is provided. This circuit-closer consists of an angle-lever s, Figs. 6 and 7, the one arm of which is usually in contact with the contact-plate 15. As soon as this arm is drawn away from the contact-plate the current is interrupted, so that the bell will not ring any more. In order to be able to restore the current automatically, the angle-lever s is situated in that Way that as soon as the door u of the room in which the bell is arranged is opened the angle-lever s returns to tact.

its former position, thereby restoring the con- In order to prevent the lever 's returning to the position in which the contact is broken as soon as the door is closed again, the lever is provided with a hinge w, held in its position by a spring t'. As may be seen from the drawings,'this hinge is only turnable in= one direction, sok that when the door is closed only this hinge-piece turns, whilethe lever s rests in its position. f

every time in cach of the rooms, the Wires which leadvthecurrent of the battery h back are fixed to the board e' and provided with, the number of the room from whichtheyf come. The free ends of these Wires are provided with a metallic ring, which can be putover each of thepins q.

The operation of, my device is vas follows:l If, for instance, the system is employed for av hotel and the guest living in the room No. 3j lWishes to be waked up at .3.15 oclock, he puts'/ at anytime before the ringv ofv thewire pro-` vided With his room-number over the-pin marked 3.15. The projecting yend ofthe:y wire fixed with its other end tothis pin'co-mes, as shown above, at 3.15 oclock in contact" with the plate or springp. A short time afterward when the contact-lever c is farther raised by the rotation of .the Wheel b, so thatl thelever touches the screw g, the circuitofr` the battery his closed, so that the currenty comingfrom the battery goes through the screw g, the contact-lever c, the axle z', the' bell 3, the Wire connecting'this bell Withthe lboard z, the pin marked 3.15, the Wire con-` necting this pin with the toothed bar n, the:

plate or spring j), which is just in contact with the projecting end of this Wire, and returns to the'battery h, ringing the bell No. 3.

The duration of each alarm-signal depends lupon the length of the teeth of the Wheel 5,1

Fig. V2,. and can be prolongated or diminished by replacing the wheel Z9 by another one with.'

longer or shorter teeth.

lon the next morning.

Assoon as the guest wishes to stop the terrupterr. Now it would be necessary after- Wards to close the circuit again in order to be'able to give alarm-,sign als in the same room In order to avoid that, this must'be done by hand. The institution described above isprovided so that the contact is restored as` soon as the door of this room 3 is opened-that is to say, as soon as In order to be able to give alarm-signals the guest leaves 'this room. p

Whatwe claim as our invention, and desire .to secure by Letters` Patent of the United yStates of America, is-h t lever, situated above the toothed wheel, an electromagnet l, an armature m, av toothedlbar fn.,- aweight o't'or m-ovingthis bar, electric wiresy, Iivxed'lto the toothed bar-a contactpost-p', pins q, provided Withtime-marksand metallic rings fixed .tol the 'wires-coming from 'the differcutrooins, as and forthe purpose set forth. l v

2. Inaan electricalarmthe combination of a clock, a toothed wheel `tixed vupon'the axle Aof the minute-hand of :this clock, a contactlever, situated above the toothed .wheel, .an electromagnet VZ, an armature rn, a toothed bar n, aweight o for moving this bar, electric wires ti/,vfixed vto the toothed bar, a contactpost p, pins g,.provided with time-marks, metallic rings -fixed tothe Wires coming from the dierent rooms, and aninterrupterconsisting of an angle-leverand a contact-plate. l

In testimonywhereof We have signed our names tothis specification in the'presence of two subscribing witnesses.

MAX WESCHER. l PAUL 'WOLLENHAUPT. Witnesses:

THEoDoR HECsE, IsIDoR .'JUNeBLUTH.

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