Fire-Extinguishing Grenade

Fire-Extinguishing Grenade

A grenade for the extinguishing of fire has been designed (patent No. 1,565,036) by Henry Tank of Alameda, Cal.

An elevation of the device, partly in cross section, is shown in the illustration. A container of glass or other material which is easily broken and spherical in shape is adapted to contain a quantity of some fire extinguishing liquid, preferably carbon tetrachloride. The wall of the container is provided with inwardly extending beads forming V-shaped or triangular grooves on the exterior side of the container and extending slightly from the bottom of the container to the neck. In the grooves are breaking bands so that when the grenade is thrown, the impact of the collision will drive the band through the container wall and make possible the flow of liquid from the container. The lower ends of the band are hooked about a ring and the upper ends of the bands are resiliently held within an internal groove into which the bead on the end of the bands snap when the cap is applied.

The fluid held in the grenade is sealed in the container by a cork and a superimposed sealing compound.

A tube passes through the center of the cap, cork and sealing compound and extends a short distance above the cap on the outside and nearly to the bottom of the container. A flange which rests on the cork and is enclosed by the sealing compound fixes the position of the tube. Within the tube there is a rod terminating in a hammer head which normally lies a short distance above the bottom of the container. At the upper end, the rod passes loosely through the end wall of the tube and is provided with an annular groove in which the cylindrical keys, which rest on the tube end, are seated. A mass of solder which fuses at a predetermined temperature is placed around the end of the rod to hold the keys in place, and maintains the position of the hammer against the spring. The grenade rests on a ring-bracket.

When the solder melts, the downward pressure of the spring throws the hammer sharply against the bottom of the container, breaking it and permitting the fluid to escape. Where it is desired to give an alarm when the grenade is broken or taken from the stand, a circuit similar to the one in the illustration may be arranged. When the grenade is taken off the stand, the keys break contact with the closed circuit, the magnet is de-energized and the arm raises up. making contact which rings the bell or other alarm.

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