US754555A

US754555A - Automatic fire-alarm.

Info

Publication number: US754555A
Application number: US14696503A
Authority: US
Inventors: Mason K Fred
Original assignee: Individual
Current assignee: Individual
Priority date: 1903-03-09
Filing date: 1903-03-09
Publication date: 1904-03-15
Anticipated expiration: 1921-03-15

Description

No. 754.555. PATENTED MAR. 15, 1904'.

M. K. PRED.

AUTOMATIC FIRE ALARM. APPLICATION P ILED MAB.. 9, 1903.

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No. r754,555.

UNITED STATES Patented March 15, 19u04.

PATENT OFFICE.

AUTOMATIC FIRE-ALARM.

SPECIFICATION forming part of Letters Patent No. 754,555, dated March 15, 1904.

Application led March 9, 1903.

T all whom, t may concer-n:

Be it known that I, MASON K. FRED, a citizen of theUnited States, residing at Pleasanton, in the county of Atascosa and State of Texas, have invented a new and useful Automatic Fire-Alarm, of which the following is a speciiication.

The invention relates .to certain improvements in automatic lire-alarm systems of that general classin which the fusing of a currentconducting wire or the like establishes an electric circuit through an alarm of any desiredv character.

The principal object of the invention is to provide a novel system which, may be installed at small cost and in which a current-conducting wire having a low fusing-point is secured in position to the walls or ceiling of a building where it will be exposed to intense heat in case of lire, the wire closing the circuit through the battery, and the severing of the wire at any point, either by fusion or cutting, will cause the sounding of an alarm.

With this and other objects in view the in vention consists in the novel construction and arrangement of parts herelnafter described, illustrated in the accompanying drawings, and

. particularly pointed outin the appended claim,

'it being understood that various changes in the form, proportions, si'ze, and minor details of the structure may be made without departing from the spirit or sacrificing any ofV the advantages of the invention.

In the accompanying drawings, Figure 1 is a diagram'of an automatic fire-alarm system arranged in accordance with the invention.

l Fig. 2 is a similar view illustrating a slightlyelectric energy being sufficiently powerful to Serial No. 146,965. (No model.)

of the coils of the electromagnet and `the additional resistance-coil 5 the current from the battery is shunted through the wires 6 and 7 and the bell-magnets are not energized. Should a fire occur or an attempt be made to destroy the alarm by severing the wires, the

The system is such as to permit the protection ofV a building of any size by a single wire, which may be readily placed in position and secured near all exposed points where tire would be likely to occur, while-the alarm may be placed at some central point in the building or may be in the form of a relay for connection with the ordinary police fire-alarm system. In testing, the circuit closer 8 is opened in order to break the circuit through the fusible wire. l

In the modified system shown in Fig. 2 a Wire of low resistance is employed for a portion of the fusible circuit in order to decrease the resistance of the line, as where the fusible wire may be led once through a room or rooms and the circuit completed by a nonfusible wire of higher conductivity. In Fig. 2 the wire 3 is a continuous wire of metal of a comparatively high conductivity extending between the poles of a battery and the binding-posts of the alarm to form a continuous closed circuit, as before described. The wire 6/ leads from one of' the bell binding-posts through the room or rooms and is then connected with the wire 3 at any desired point in order to complete the circuit. This arrangement of the system is useful in that less battery-power will be required than can be employed where it is only necessary to lead current will instantly flow through the coils 'of the electromagnets and sound the alarm.

IOO

a single Wire once through all of the rooms to be protected.

'Ihe fusible Wire may be formed of any desired metal or alloy, While the Wires 3 and 4 are of course of higher conductivity, but preferably of ametal of comparatively high resistance. The resistance of the coils Will depend on the length and resistance of the fusible Wire, and one or more additional coils or other forms of resistance may be placed in the line when found necessary.

Having thus described my invention, what I clairn is- An automatic fire-alarm system comprising an alarm, a source `of electrical energy connected direct in a closed circuit with said alarm, a Wire formed of fusible metal extending throughout the room or rooms to be protected and also connected in closed circuit with the battery, and artificial resistance connected in the line between the alarm and the point of connection of the fusible Wire with the battery, such resistance being greater than that offered by the fusible wire.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

MASON K. FRED.

Witnesses:

W. M. ABERNETHY, ff H. G. MARTIN.