HAND FIRE EXTINGUISHERS AND PROCESS OF SEALING THE SAME
Year: 1888

page_text: Date of Application, 6th Mar., 1888
Specification Accepted, 27th Apr., 1888
паци гиС ГАИ инеге ан
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I WILLIAM M. HARRISON of Baltimore City, in the State of Maryland, United
States of America, Manufacturer, do hereby declare the nature of my invention for
HAND FIRE EXTINGUISHERS AND PROCESS OF SEALING THE SAME, and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement :-
My invention has relation to hand fire extinguishers and the process of sealing
the same and consists in the hereinafter described construction, arrangement and
combination of parts and improved process of hermetically sealing the device.
In the accompanying drawings, Figure 1 is a longitudinal central section through
my improved hand fire extinguisher, the parts being adjusted in the position they
assume when ready for shipment or storage, the handle being removed. Fig. 2 is a
similar section through sufficient of the device to show how the handle is attached
for use, the handle being shown in the elevation, and broken away to shorten it, the
outer solid cap in Fig. 1 being removed and a perforated cap substituted showing
also my improved method of sealing the extinguisher, and Figure 3 is a plan view
of the rear end piece of the syringe, showing the nut in the square perforation.
Like letters of reference mark the same parts in all the figures.
Referring to the drawings by letters of reference, A is the main body of my device
in the form of a tube-such as is used in an ordinary syringe-each end of which
is provided with a curved outward flange, as at a a¹, to receive the ends B B³, whose
edges are curved to fit closely into the flangos a a', and be there held for soldering,
after the manner of securing the heads in a fruit can. The end B forms the point or
delivery end of the syringe, and is made of a single sheet of tin or other metal struck
up into substantially a conical form, as shown in Fig. 1, with a central perforation, c,
into which is soldered a plug C, of substantially the form of an ordinary rivet,
having a stem c¹ and flat head c". The plug is inserted as shown in Fig. 1, with the
major portion of the body and the head projecting therefrom. The end B¹ is dish
shaped and is also formed by striking up out of a single piece of sheet metal, in
which operation a circular groove d and a square central perforation d' are formed.
D is an ordinary spun sheet metal screw-cap, the thread of which is marked d",
and which has an outward flaring conical flange d. This flange corresponds in
circumference with and sets into the groove d in the end B where it is securely

page_text: soldered. The outer end of this cap is perforated at e leaving a narrow flange
shown in Fig. 1.
as
E is another screw cap without the outward conical flange, but otherwise of the
form of the cap D, and of a size to fit over said cap and when screwed home to leave
room between it and the flange e¹ of the cap D to receive a packing-disk E' of any
suitable material.
F is a piston head composed of an interior concave or dished metal washer G, a
washer or disk H, of rubber or other flexible material, and an outer dished metal
washer I. These three disks or washers are centrally perforated.
J is a bolt which is passed from the interior of these washers the threaded point
projecting beyond the outer washer or disk I, and the head resting against the inner
washer G.
K is a nut which is threaded to engage the outer projecting end of bolt J, which
bolt is only of a length to enter the nut, as shown, leaving part of the threaded bore
of the nut unoccupied.
Lis the handle, having the cross bar M and threaded end N; when applied for use,
this threaded end enters the unoccupied portion of the nut K before referred to.
O is a spun sheet metal screw cap of the same size and shape as cap E, except that
it has a central perforation O¹ to receive the handle.
P is a filling of paraffine or other similar material and p is a small quantity, say
one drop, of oil or other lubricating material.
When the parts are in the position shown in Fig. 1 the oil p is dropped into the
nut K. The paraffine P (about a teaspoonful in a molten state) is poured in, the
quantity being about sufficient to cover the nut as shown. After the paraffine has partially
cooled (sufficient to be plastic) a rod with a thread similar to the thread N of the
handle, is given a few turns into the paraffine and the thread of the nut cleared to
receive the handle when ready. This leaves the oil in the nut with a slight seal of
paraffine over it, ready to lubricate the thread of the handle when inserted."
The operation of my improved device is as follows: The parts being in the
position as shown in Fig. 1 the syringe having been filled with fire extinguishing
compound, with the nut K projecting into the square perforation in the end B,
solder, as at S, having been poured around it, forming a close seal and effectually
holding the nut as in a wrench, against turning, in this condition the device, with the
handle separate, is ready for shipment and storage. To prepare it for use the cap E
is removed and the perforated cap O put in place. The point of the handle is inserted
and screwed home into the unoccupied part of the nut as shown in Fig. 2. It is now
ready to hang up or be otherwise placed within easy reach for use. To use it, it is
only necessary to knock out the plug by tapping against some rigid edge or corner
with a knife or other implement leaving the perforation in end B open as a nozzle.
The butt end of the handle or cross bar is now given a smart blow loosening a nut
and leaving the device in position to press the handle, driving the piston forward and
ejecting the fluid a distance of from twenty to forty feet if necessary.
The seal and lubricator leaves the device always impervious to air, and prevents
corrosion, whereby great difficulty in operation would result.
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. A syringe fire extinguisher, sealed and lubricated in the manner described
and provided with an opening in its rear end conforming in outline to a nut attached
to the piston-head whereby the nut, when the piston head is at the rear end of the
stroke, will be securely held for the insertion of the detachable handle.
Second. In combination, the piston-head consisting of the outer and inner rigid
disks, an inclosed flexible disk, the screw passing through said perforations, to the
nut on the opposite side thereof to receive said screw, and the body of the syringe
having a perforation in its rear end to receive and securely hold the nut therein, the
syringe being scaled and lubricated, as set forth.

page_text: Third. In combination, the piston-head having a nut secured at its rear side, the
rear end of the syringe having a central perforation to receive the nut, and a seam
of solder or other proper sealing material to secure the nut therein and a proper
lubricant.
Fourth. In combination, the piston-head having a nut at its rear side, a threaded
handle to enter said nut, the rear end of the syringe having a perforation corre-
sponding in size and shape to said nut for receiving and holding it against turning,
and a cap soldered to said end piece and having a central perforation to receive and
guide the piston rod or handle, the syringe being provided with paraffine and oil as
set forth.
Fifth. The herein described method of sealing and lubricating hand fire extinguishers,
which consists in dropping oil p into nut K, covering said oil and nut with molten
paraffine, inserting a threaded rod into said paraffine when in a plastic or partially
cool state and finally allowing the same to harden as set forth.
ALLISON BROS.,
Agents for the Applicant.