US1145763A - Fire-alarm. - Google Patents

Description

E. E. FRYBERG.

FIRE ALARM.

APPLICATION FILED MAR. 16. 1914.

mmmm Patented July 6,1915.

WITNESSS i so ELMER E. I FRYBERG, OF DULUTH, MINNESOTA, ASSIGNOR OF ONE-THIRD TO LOUIS BERGLUND AND ONE-THIRD T JOHN CARLSON, BOTH 0F DULUTH, MINNESOTA.

FIRE-ALARM.

Mamas;

Specification of Letters Patent.

Patented July 6, 1915.

T0 all whom it mag concern Be it known that I, ELMER E. FRYBERG,

' a citizen of the United States,residing at Duluth, in the county of St. Louisand State of- Minnesota, have 'invented certain new and useful Improvements in Fire-Alarms,

of which the following is a specification, reference being. had therein to the accompanying drawing.

My invention relates to improvements in ,fixealarms, the primary Object of which is to provide an alarm which is operated by the heat or flames from the fire.

D hotels, apartments, etc, where'noticeof fire.

i-An'other object of the present improvementisto devise an alarm which, set by the flames .or heat from the fire, will communi- -cate an alarm through a telephone system.

The device is especially adapted for use in noted objects which is both simple, cheap and durable. l

In the accompanying drawings: Figure '1 is a top plan view, partly broken away of my improved fire alarm. Fig. 2 is a side ele-' vation of my improved alarm shown con.-

nected with a telephone circuit.

Referring now to the drawings in which.

like numerals designate similar parts, 1 represents the base of the alarm mechanism and is preferably constructed of'metal or some material which is not quickly inflammable. Upon one end of this base is mounted a'spring actuated bell 2 which is of the common door -'bell design, wherein the bell is actuated by means of a spring 3 mounted upon a supporting stem 4, the bell having a forms of a bell would answer the same purpose, but for simplicity I prefer to use the one illustrated, the construction of which 1s well known.

Adjacent the bell and fixed to the base is V an inverted U-shaped staple 6 pivotally carrying about its projectin body portion a spiral spring 7, the short hbrizontal end 8 of which normally engages the under edge 9 of the bell. When the bell is thus engaged by the end 8 it is prevented from being re-- volved by the action of the spring 3. The posltiveness of this engagement may be en hanced, if'found necessary, by forming a notch in the edge of the bell for the receplZlOIl of the end 8 of the spring. However, 1f the directcontact is found sufficient to hold the hell, no notches are necessary. The opposite end or arm 10 of the spring extends upwardly at approximatelyright angles to the end 8 and to a distance about even with the top of the bell.

A somewhat similar appearing member 11 1s fixed stationary to the base 1 and is spaced apart from the spring arm 10. The upper free ends of both the arm 10 and the member 11 are normally connected by a short piece of fuse wire 12 having preferably suspended therefrom, in any suitable form, an

inflammable substance 13 such as cotton,

pa er or the like.

n upper projecting rigid top or keeper 14 is fixed to the base 1, intermediate the spring 7 and the bell 2. This keeper 14 has when the arm 10 of the spring flies back toward the bell, released by the burning of the fusible material, it will be caught in the bifurcated mouth of the keeper and be held therein until manually removed.

It is to be understood that this device is shown in its simplest form in Fig. 1, and is intended for use in any place where fire may be expected to occur and where the ringing of a bell might attract attention.

The operation of the device is as follows: The bell 2 is first wound up. The arm 10 of the spring 7 is drawn away from the bell with sullicient force to cause the end 8 thereof to forcibly impinge the under edge of the bell 2 and prevent it from revolving. The fuse wire 12 is then connected to the upper ends of the standard 11 and the arm 10 which holds them normally in the position illustrated in the drawings. As soon as a flame or extreme heat effects a sever-- ing of the fuse 12, the spring arm 10 will snap into the keeper 15 and be held therein while the hell 2 is free to revolve and be sounded by the clapper 5 during the ex: pansion of the spring. The inflammable substance 13 may or may not be employed as desired, for the reason that the soft fuse 12 is of such consistency as to be readily disintegrated by heat.

My manner of attaching the above described alarm mechanism to a telephone system is shown in Fig. 2 of the drawing. A wire 16 is led from one of the telephone wires 17 to the U-shaped support 6 of the spring 7. Another wire 18 leads from the wire 19 of the telephone circuit to one pole of a suitable solenoid 20 located adjacent thetelephone box 21. The opposite pole 22 of the solenoid 20 is connected by a suitable wire to the keeper 14; of the alarm mechanism. A reciprocating core 28 is placed within the solenoid 20, the depending arm of which is hooked under the receiver arm 25 of the telephone as at 24. This connection in no wise interferes with the free and customary action of the arm 25 when manipulated by the receiver 26. ln ope rsr tion should the alarm be set off by heat or flame as has been above described, the electric circuit between the telephone wire, which is always alive, and the solenoid will be instantly closed. This closing of the circuit will cause the core 23 to rise and lift with it the receiver arm 25 of the telephone, carrying. with it the receiver. It is evident that this movement of the receiver arm will call central and allow the distinct hearing of the buzzing of the bell which is adjacent the telephone. Central can then turn in a general alarm.

It is evident how admirable the device is adapted for hotels or apartmentswhere it may be installed in conjunction with any telephone system.

Having thus fully described my invention what I claim and desire to secure by Letters Patent is:

An alarm mechanism comprising a base, a mechanically operated bell mounted thereon, a catch engaging the bell and preventing it from sounding, the said catch held by a fusible connection between it and the base, a keeper for the catch when it has been re leased, a telephone instrument, a solenoid 'having its core engaging the receiving arm ELMER E. FRYBERG. Witnesses W. H. DENI-IAM, S. Gno. STEVENS.

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