US2059113A - Fike alarm - Google Patents

Description

Oct. 27, 1936. Q N KALSTROM ET AL 2,059,113

FIRE ALARM Filed March 14, 1936 0 /Z Elma/Mo es AZ 4 ma Z6 N/faisirom,

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Patented Oct. 27, 1936 PATENT QFFICE FIRE ALARM Charles N. Kalstrom and Blunt S. Pope, Henderson, N.

Application March 14, 1936, Serial No. 68,930

3 Claims.

This invention relates to the class of signals and alarms and pertains particularly toan improved fire alarm.

The primary object of the present invention is to provide an alarm device for giving warning of a fire which will be positive in operation and which is so designed that it may be economically constructed and sold at such a price as to enable anyone to obtain a number of the devices for placement in various portions of a house or other building.

Another object of the invention is to provide an alarm device which is designed to signal by causing a loud explosion as a result of being heated to a predetermined degree by the starting of a fire in the vicinity of the device.

A still further object of the invention is to provide a fire alarm device comprising a firecracker of a character to give a loud report upon ignition, which is housed in a screen cage having a lining of highly inflammable material whereby the development of a fire in the immediate vicinity of the device will effect the ignition of the liner at a relatively low temperature and thus set off the signaling firecracker before the fire has gained any material headway.

The invention will be best understood from a consideration of the following detailed description taken in connection with the accompanying drawing forming part of this specification, with the understanding, however, that the invention is not confined to any strict conformity with the showing of the drawing but may be changed or modified so long as such changes or modifications mark no material departure from the salient features of the invention as expressed in the appended claims.

In the drawing:

Figure 1 is a view in section through the top portion of a house or other building showing the device embodying the present invention in several different positions in the attic.

Fig. 2 is a view in side elevation of the alarm device.

Fig. 3 is a view in end elevation of the same.

Fig. 4 is a section on the line 4-4 of Fig. 2.

Fig. 5 is a section on the line 5-5 of Fig. 2.

Referring now more particularly to the drawing wherein like numerals of reference indicate corresponding parts throughout the specification, the numeral l designates the attic portion of any building structure, particularly a home, in which the device is primarily intended for use, although it is to be understood that it may be used in any location where there would be the possibility of some one hearing the report from the device when the same is ignited by fire.

While the alarm device is intended to be used in any suitable location, it is a particular object that the devicebe placed in the vicinity of a chimney 2, as illustrated, as it is about the area of a building thru which the chimney passes that a fire usually occurs.

The device embodying the present invention is indicated generally by the numeral 3 and as illustrated in detail in Figs. 2 to 5, it comprises a body of wire screen fabric which is rolled to form a cylinder 4, the longitudinal edges of which are disposed preferably in overlapped relation, as indicated at 5 in Fig. 5. While any suitable means may be employed for securing the overlapped edges 5 in the wires shown or securing them together in any other manner, it is preferred that these edges be joined by the reversely bent terminals 6 of a wire 7 which is bent intermediate its ends to form the elongated hanging loop which is particularly illustrated in Fig. 2. By this means the device or wire 1 performs the double function of holding the overlapped edges together and providing means whereby the device may be suspended from a rafter of a building adjacent the chimney 2, as illustrated in Fig. l.

The cylinder 4 which is formed by rolling the wire, has its ends closed by slitting the wire in a number of places, as indicated at 8 and turning in the portions thus formed, one over the other, to form the screen wire end walls 9.

Before closing the ends of the cylinder l, there is slipped into the same the sleeve or rolled sheet of material which is indicated by the numeral l0, and which is of some highly inflammable material such as celluloid. This cylinder of inflammable material Ili is open at its ends and disposed within the same is a detonating device H such as a firecracker, which is provided with a fuse I2 to be ignited from the sleeve or lining l0 when the latter takes fire.

It will be noted that the cylinder 4 and lining in are of materially greater length than the firecracker ll so that after the inflammable sleeve ill has been ignited, it will burn for a short period before it reaches the fuse l2, thus insuring the development of a sufiicient amount of heat to ignite the fuse.

By placing the noise-producing device H and the inflammable cylinder ill within the wire screen cylinder 4, the device is protected against damage by rats, mice, or other rodents.

From the foregoing it will be apparent that the device embodying the present invention may be very easily and quickly made and that it may therefore be made economically and sold at a reasonable price so that anyone will be financially able to obtain a few of the devices for disposal about the attic of the house, and thus be assured of a warning in the event that fire occurs anywhere in the immediate vicinity of the device.

We claim:

1. A fire alarm device, comprising a casing of screen wire material formed from a sheet of screen wire and having longitudinal overlapping edges, said casing being closed on all sides, a lining of inflammable material within the casing, an ignitible detonating device within the lining, and suspension means comprising a looped wire having reversely bent terminal portions whi h. are passed through the overlapping portions of the screen casing to secure the said overlapped portions together,

2. A fire alarm device, comprising a cylinder formed of a rolled sheet of screen wire having longitudinal overlapping edges and having inturned end portions whereby the cylinder is closed throughout, a lining of celluloid within the cylinder, a firecracker disposed Within the lining, said lining forming a cylinder having open ends, and means facilitating the suspension of the cylinder and also serving to secure the overlapped longitudinal edges thereof together.

3. A fire alarm device comprising a body of screen wire rolled into cylindrical form and having overlapping edges extending longitudinally thereof, means extending through the meshes of the overlapping edges of the wire to secure the edges together and maintain the wire in said form, the wire of the cylinder being inturned at each end to form end walls, a lining cylinder of inflammable material within the screen cylinder, and a detonating device within the lining cylinder and having an exposed igniting fuse.

CHARLES N. KALSTROM. BLUNT S. POPE.

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