IMPROVEMENTS IN FIRE EXTIN- GUISHERS
Year: 1879

page_text: LETTERS PATENT to Gerard Wenzeslaus von Nawrocki, of the Firm of
J. Brandt and G. W. v. Nawrocki, of 124, Leipziger-strasse, Berlin, Germany,
Patent Agents, for the Invention of "IMPROVEMENTS IN FIRE EXTIN-
GUISHERS. A communication by Heinrich Böhle, of Spandau, in the German
Empire.
Sealed the 25th May 1880, and dated the 29th November 1879.
PROVISIONAL SPECIFICATION left by the said Gerard Wenzeslaus v.
Nawrocki at the Office of the Commissioners of Patents on the 29th November
1879.
GERARD WENZESLAUS VON NAWROCKI, of the Firm of J. Brandt and G. W. v.
Nawrocki, of 124, Leipzigerstrasse, Berlin, Germany, Patent Agent. "IMPROVE-
MENTS IN FIRE EXTINGUISHERS. A communication by Heinrich Böhle, of
Spandau, in the German Empire.
22
The Invention relates to fire extinguishers or apparatus for producing a jet of
liquid by means of direct gas pressure, and consists, first, in the application of a
receptacle for acid mado of glass or other brittle material, weaker towards the
bottom than at the top, and provided, if desired, with an annular groove near the
bottom, said receptacle being enclosed in metallic tube or casing, and broken to
pieces by pressure when the apparatus is to be set in action. Also in producing
the required (breaking) pressure on the acid receptacle by means of a screw spindle
passing through a stuffing box, and turned by a crank, the boss of which, when
coming into contact with the packing device, serves to establish a tight packing.
Also in connecting the top or bottom of the (cylindrical) main vessel, or both, with
the shell of the latter by screw or other movable joints in order to facilitate the
cleaning of the vessel, the bottom being further provided with flanges, which form
a stand. The acid receptacle may be closed at the top by a conical plug, and the
metallic casing may be open at the top and screwed into the metallic cap of the
vessel, while the bottom is perforated for the exit of the acid emanating from
the broken receptacle into the surrounding liquid, so as to gradually decompose the
bicarbonate of soda or other salt contained therein. In order to prevent the
apparatus being set in action by wrongful hands a sleeve may be inserted between
the boss of the crank and the stuffing box, made in two halves, hinged together,
and capable of being opened by cutting a string or applying a key.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Gerard Wenzeslaus von Nawrocki in the Great Seal Patent Office on
the 27th May 1880.
GERARD WENZESLAUS VON NAWROCKI, of the Firm of J. Brandt and G. W. v.
Nawrocki, of 124, Leipzigerstrasse, Berlin, Germany, Patent Agents. "IMPROVE-
MENTS IN FIRE EXTINGUISHERS." A communication by Heinrich Böhle, of Spandau,
in the German Empire.
The improvements relate to fire extinguishers or apparatus for producing a jet
of liquid by means of direct gas pressure, and more particularly to the construction
of the acid receptacle of glass or a similar brittle material, which is not attacked
by sulphuric acid, as well as to its application in the fire extinguisher. Also to a
peculiar construction of the body of the fire extinguisher with the object of
facilitating the cleaning of the latter. In the accompanying Drawings, which
illustrate the improvements, is Fig. 1 a cross section of the fire extinguisher, while
Fig. 2 shows in a larger scale the top part with acid receptacle. The acid receptacle
a is preferably made of glass, and increases in strength from the bottom to the top.
This receptacle is closed airtight by a plug coated with paraffine, and is placed in
a cylindrical metallic casing b attached to the cap A. screwed into the cover of the
extinguisher. The lower part of this casing b has several perforations, and is lined
with brass wire gauze c. The cap A forms also the nut for the screw d, the spindle
of which passes through a stuffing box band carries a crank f. When using the
aparatus a pressure is exerted on the acid receptacle a by turning down the screw d
until the receptacle bursts at its lower part. The destruction of the receptacle may
be facilitated by providing its lower part with a circular groove, as shown in
Fig. 2, or by otherwise partially weakening the walls of the vessel, so that a
fracture occurs at the desired places when pressure is applied to the top of the acid
vessel. The wire gauze forms an elastic support to the acid vessel, and prevents
in connection with the casing b that the particles of the burst acid receptacle enter
the body or barrel of the extinguisher, while the holes in the casing provide a
gradual escape of the sulphuric acid into the contents of the barrel, consisting
chiefly of a solution of bicarbonate of soda in water, which surrounds the casing,
thereby causing a gradual developement of carbonic acid. In order to prevent
unauthorized persons from turning down the screw d when the extinguisher is
kept in reserve an arresting piece is applied at the upper part of the screw
spindle, said piece g resting on the nut of the stuffing box, and being made in two
hinged parts kept closed by a string, the ends of which are sealed with lead. If
the seal is removed the two halves of the arresting piece or washer can be turned
out of contact with the boss k, so as to allow the crank with the screw d to be
turned down. The parts are so constructed that in turning down the screw the
boss k of the crank presses on the gland of the stuffing box and ensures tight-
ness, even if the packing of asbestos, &c., should not be filled in properly. Fire
extinguishers have hitherto been cleaned through the feed opening of the apparatus,
and therefore only in an imperfect manner. As the application of a special mud-
hole in the bottom of the fire extinguisher would be objectionable the bottom
the apparatus herein described is not connected with the mantle by rivets, as usual,
but by a screw joint, as shown in Figs. 3 and 4. The bottom is also provided with
a flange or stand r, which forms a stand for the extinguisher. The internal pressure
against the mantle or shell assists in keeping the joint tight. The Drawings show
two modifications, which however represent the same principle. The flange r of
the bottom is provided with two large openings or slots, which facilitate the
attachment or removal of the bottom. A similar screw joint can be applied to the
cover of the extinguisher. Claims.-1. In fire extinguishers the application of an
of

page_text: acid receptacle of glass or similar brittle material, the walls of which are made
weaker towards the bottom, and may or may not be provided with a groove or
grooves or equivalent deformation, said receptacle being enclosed in a inetal casing,
2. In
and made to burst by pressure when the apparatus is to be set in action.
fire extinguishers of the class indicated by claim 1 the arrangement of the crank f,
the boss of which acts on the gland of the stuffing box or equivalent device when
the apparatus is set in action, so as to compress the packing, substantially as
described. 3. In fire extinguishers the application of a cover and bottom con-
structed and connected with the shell substantially as described, the bottom being
also provided with a flange or stand for supporting the fire extinguisher,
In witness whereof, I, the said Gerard Wenzeslaus von Nawrocki, have here-
unto set my hand and seal, this Twenty fifth day of May, A.D. 1880.
ATTRAC גו?
ANS VON NAWROCKI
(1.0)