US986355A

US986355A - Automatic fire-alarm.

Info

Publication number: US986355A
Application number: US58527210A
Authority: US
Inventors: John H Bruhn Jr
Original assignee: Individual
Current assignee: Individual
Priority date: 1910-10-04
Filing date: 1910-10-04
Publication date: 1911-03-07
Anticipated expiration: 1928-03-07

Description

J. H. BRUHN, JR. AUTOMATIC FIRE ALARM. APPLICATION FILED OCT. 4. 1910.

'T;E- LL.

2 SHEETS-SHEET l.

Patented M22127, 1911.

J; H. BRUHN, JR. AUTOMATIG FIRE ALARM. APPLICIATION FILED OUT. 4, 1910.

2 SHEETS-SHEET 2.

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355; Y I Pateilteii Mar.7,1911.

:rrnn fsT T srATENT OFFICE.

JOHN H. BRUHN, are, or SPIRIT LAKE, Iowa;

AUTOMATIC FIRE-ALARM."

Specification of Letterslatent.

Patented time. 7,1911.

Application filedfictobere, 1910. Serial No. 585,272;

To all' ulrom it may concern: 7

Be it known-that I, Jonn BRUHN, Jr., a citizen'of the United States, residing at Spirit Lake, in the county of Dickinson,

State of Iowa, have invented certain new and useful Improvements, in Automatic Fire-Alarms; andI do hereby declare the followingto be a full, clear, and exact description of the invention, such as will en- 1o able others skilled in the art to which'it ap- With the above and other objects in View the invention consists in general, of certain novel arrangements of details and combinations ofparts hereinafter fully described,

' illustrated in the accompanyingdrawings, a'nd specifically set forth in the claims.

In the accompanying drawings, like char actors of refernce indicate like parts in the several views, and; Figure 1 is a diagrammatic view showing a telephone system ar ranged in accordance with this invention.

Fig. 2 is a view of .the thermostat used in Jnnection with this invention. Fig. 3 is a diagrammatic view showing the wiring of a house having thermostats at diiferent points The thermostat used in connection with this invention is properly speaking a two- V point thermostatic switch and comprises a base 10 whereon' is mounted a J-shaped metallic frame 11. At the end ofthe stem 0f this frame is an insulator block 12 upon which is supported one er of-a thermostatic element 13 consisting of a pair of metallic bars having different linear coeflicients 'of expansion under the influence of heat, the bars being rivet d or otherwise secured together as is common in such: devices. On the base 10is' a binding post 14 adapted for connection of the line wire as will be hereinafter d cr bed and throughthe 'base and frame extends a. contact memberf15 which is preferably threaded so that it may be ad 'tery 28 connected to the ground at 29; The

justed to suit varyingconditions. This con tact member is connected to the binding post 14 by means of a wire 16,; Onthe frame 10 is carried an insulat onblock l7 1 through which passes an adjustable contact member 18, the frame being provided with an open ing for said member of suflicient size so. that the member 18 does not-at any time 'touch the frame 11, theinsulatingblock preferably being provided with a bushing fitting said opening. These parts are so arranged that under normal heat conditions thethermostatic member 13 will have its free end in contact with the contact, member 15 while under conditions of increaseof heat this free end will swing over to, the member 18 and complete a contact therewith.

The telephone system comprises the usual subscribers, stations 19, the several stations" 7 being specifically indicated by the letters,A,: B, C and B respectively. In the systemhere shown there is indicated as'ingle wire system, the return being through the ground and at 20 is indicated the ground wire of each station. Ateach of the subscribers stations is an auxiliary battery 21 which is connected to the ground wire at onepole and to the respectivevcontact 18 at the other pole, The linewires leading from the sev-- eral stations are indicated. M22 and these line wires are connected to the icontacts '15 of the respective thermostats. It willnzbe seen by reference to Fig. 3 that where more than one thermostat is used in connection with a single subscribers station the ther mostats are arranged in series on theline wires 22 and thatthe localor auxiliary battery 21 is connected in multiple to the contacts 18' of the several thermostats. Leading from the thermostats are line wires 23, which run'to thecentral station, each wire passing through the annunciator-system as; typically indicated by the magnets 2 1-. The wires leading fromthe magnets 24 are connected in multiple. to a "wire, 25' which is? wound; around amagnetfcore 26 and from 1 this core passes throirgh a central telephone station provided with the usual service bat-1'65 magnet ofwhich 26- is the core constitutes.

'the circuit clo'sing'magnet of a relay indi-' cated in. general at. R[ Thisrelay or circuit closer isprovided with a ba e 30 whereon the magnet is supported and on. this base is 110' a fulcrum 31' havingan arm 32 pivoted -thereto ,-said am being provided with an magnet. At is a a battery 39 and a bell auxiliary battery in the armature 33 arranged for attraction by the magnet core 26 when the magnet is energized. The base is of insulating material and secured. thereon is acontact member 34 which is arranged to be engaged by the arm 32 when the armature is drawn toward the post which carries a tension screw 36. Connecting the screws 36 and the arm 32 is a tension spring 37 which normally urges the armature 33 away from the magnet but which is arranged in such manner as to permit the-movement of the armature to the magnet when the magnet has been energized to a sufiicient degree. Connected to the contact member 34 and to the fulcrum member 31 are the ends of a normally open signal circuit 38 embracing or other signal 40. The arrangement of the various parts is such that under the normal conditions arising from the flow of currentfrom the battery 28 through the relay magnet the spring 37 will be tensioned sufficiently to prevent the armature 33 from being drawn toward the relay magnet and in consequence the circuit 38 which constitutes the secondary of the relay williremain open. When, how ever, under abnormal conditions to any one of the telephone stations, the thermostat closes the circuit through't-he battery 21 at that station and opens the telephone circuit the increased current flow due to cutting in the auxiliary battery 21 will increase the power of the magnet 26 to such extent that the armature 33 will be attracted to the magnet and the circuit 39 and signal 40 closed and the alarm given. Since the wires from the local or subscribers telephone leads through the annunciator it will beplain at the same time that the alarm is rung the 'annunciator drops and indi' cates at which telephone the fire has taken place and the operator at the central station.

can immediately notify the fire department of the exact location of a fire.

In the arrangement of wiring shown inv Fig. 3 it will be obvious that any one of the thermostats may operate to connect an circuit without the others being aiiected.

There has thus been provided a simple and ellicient device of the kind described and for the purpose specified.

may be made in the form It is obvious that many minor changes and construction of this invention without departing from the material principles thereof. It is not through the battery therefore desired to confine the invention to the exact form herein shown and described but it is wished to include all such as properly come within the scope of the appended claims.

What is claimed is 1. The combination with a main line telephone eircuit including a line wire, a local telephone instrument, a central station annunciator and a two point thermostat switch holding the telephone'in circuit under normal heat conditions, said line wire being connected to one point of said switch and the thermostat element of the switch, a battery connected to the remaining point of said switch, a normally open signal circuit, a magnetic circuit closer in said signal circuit and having its magnetic winding connected to said line wire, and means to hold said circiiihcloser open against current impulses from the local telephone instrument.

2. The combination with a telephone circuit including a service battery and a relay inoperable under the battery; of a signal circuit controlled by the relay, a subscribers station-normally in the telephone circuit, an auxiliary battery, and thermostatic means .for substituting the auxiliary battery for the subscribers station in the telephone circuit. 7

3. The combination with a telephone circuit including a service battery and a relay inoperable under the influence of the service battery; of a signal circuit controlled by the relay, a subscribers station, an auxiliary battery and a two point thermostaticswitch in said telephone circuit and having its points connected respectively to the subscribers station and the auxiliary battery.

4. The combination with a telephone circuit including a service battery, a relay inoperable under the influence of the service battery, a subscribers station, and a series of two point thermostatic switches; of an auxiliary battery, a si nal circuit controlled by the relay,aand 'mu ltiple connections between the switches and auxiliary battery whereby the operation 'of any switch will substitute the auxiliary battery for thesub scribers instrument in the telephone circuit,

In testimony whereof, I aifix my signafl ture, in presence of two witnesses.

Witnesses WILLIAM H. EHLBEoK, ANNA 'BRUHN.

JOHN 'BRU'HN, JR.