A New Type Tetrachloride Extinguisher
The O. G. Heyen company has started quantity production on a new type of carbon tetrachloride, one-quart, extinguisher which has a number of very desirable features.
Its construction is radically different from that of the present designs of carbon tetrachloride extinguishers in that there is no reciprocating pump motion in discharging the fluid. The liquid is forced out by turning a crank at the top of the extinguisher. This crank is connected through two bevel gears inside the container to a threaded rod running the entire length of the container and centered therein This rod is pivoted top and bottom. On it rides a plunger with patented packing which maintains an airtight fit. As the crank is turned the threaded rod rotates and the piston rises, forcing out the liquid through the nozzle. The crank can be turned only in one direction so that it is impossible for mistake to be made in operating it; in other words, it is quite fool-proof. Even the shut off valve is opened in operating the crank; and being closed when handled is set in off position, all evaporation of contents is practically eliminated. As the piston in this extinguisher sweeps out the entire area of the cylinder, no hinged suction pipes are required inside the extinguisher to pick up the fluid when it gets low, nor are any air valves necessary.
In tests conducted at the factory of the company, and witnessed by a representative of this journal, the effectiveness of control of the stream from this extinguisher, which is known by the trade name of “Endfire,” was quite noticeable. The operation of the device, being such as to permit holding the extinguisher tightly against the body, made it possible to maintain an accurately placed stream, which is continuous by virtue of the mechanism of the extinguisher.