Year: 1887

page_text: Date of Application, 21st Jan., 1887.
Specification Accepted, 22nd Feb., 1887.
I, HERBERT JOHN ALLISON, of 52 Chancery Lane, London, in the County of
Middlesex, Patent Agent, do hereby declare the nature of this invention, and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement :-
This invention relates to portable chemical fire extinguishers and consists in the
improvements hereinafter described and illustrated in the accompanying drawing in
which;
Figure 1 is a side elevation of the apparatus.
Figure 2 a vertical cross-section on line - Figure 1.
Figure 3 a horizontal cross section on line y-y figure 2, and
Figure 4 is a view enlarged of parts of the apparatus.
The same letters refer to corresponding parts in the several figures.
A is the shell of the extinguisher: B the cover or cap, provided with elastic packing
ring B; C is a clamping strap secured to the side of the case by lugs C¹; D is a
clamping screw; E an outlet cock and F a bail or handle.
The
Gis the main or outer chamber of the extinguisher; H a case forming inner
chamber H; I is a spherical stopper or valve; J is a screw thimble or socket
provided with perforations J¹; K is a spring safety valve Lan adjustment screw
provided with clastic packing ring L'; M is a tube connected with the outlet cock E.
The shell A and cover B of the apparatus are constructed of suitable metal.
cover is secured in place by the clamping strap C and screw D. The apparatus is
provided with an outlet cock E and may be provided with a bail or handle F.
The main chamber G of the apparatus contains a case H forming the inner
chamber H which is closed by stopper or valve I. The case H is suspended from
cap B by means of a thimble J with perforations J'. The thimble J is provided with
a female screw and case H with a malo screw as shown. By this construction case H

page_text: is readily withdrawn from main chamber G and disconnected from thimble J. The
spring safety valve K may be set to any desired pressure by means of the thumb
screw L. The tube M is formed of metal.
The chamber G is supplied with an alkaline, and chamber H¹ with an acid solution,
and case H is screwed to cap B. The cap B is then placed in position and secured by
means of screw D and strap Cas shown. The valve or stopper I fits into a seat
formed in the orifice of chamber H and tightly closes said chamber. This valve is
made of glass, metal or other heavy material in a spherical form and is automatic in
its operation. When the extinguisher stands upright stopper I remains in its seat,
but on reversal of the same, the stopper falls into thimble J and the acid and alkaline
solutions commingle creating a gas. This gas produces sufficient pressure to eject
with force the fluid contents of the apparatus.
The automatic screw valve K is so located that when the extinguisher is inverted
and in a position to discharge its contents said valve will be in the space into which
the gas rises and any undue pressure of gas in chamber G will be prevented though
the outlet cock remains closed. The tube M is connected with this outlet and extends
across or partially across chamber G to enable the entire contents of the chamber to
escape when the extinguisher is in a horizontal position with outlet cock E the
upon
upper side.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed, I declare that what I claim is ;-
First. In a chemical fire extinguisher a case H with chamber H suspended from
the cover of chamber G substantially as and for the purpose set forth.
Second. In a chemical fire extinguisher the case H suspended from cap B by means
of thimble J in combination with a clamping strap C and screw D substantially as and
for the purpose set forth.
Third. In a chemical fire extinguisher an inner chamber H' provided with an
automatic stopper or valve I substantially as and for the purpose set forth.
Fourth. In a chemical fire extinguisher a safety valve K located in the bottom of
chamber G substantially as and for the purpose set forth.
Fifth. In a chemical fire extinguisher the tube M in combination with an outlet
cock substantially as and for the purpose set forth.
Sixth. In a chemical fire extinguisher the main chamber G provided with an outlet
cock E and safety valve K in combination with an inner chamber H¹ provided with
an automatic stopper I and suspended from cover B substantially as set forth.
ATTISON DUAS