Year: 1888

page_text: I, ALBERT LESLIE PITNEY, residing at 1209 S street, Washington City, District of
Columbia, United States of America, Gentleman, 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:—
The object of the invention is to provide a device adapted for use in extinguishing
fires, and consists in certain novel combinations of parts in a syringe adapted to be
filled with an extinguishing fluid, and having a piston rod and piston so connected
that ordinarily the rod will be held in the body of the syringe, but when desired can
be drawn partly through the piston head and engaged therewith in suitable position
for operating.
In the accompanying drawing:
Figure 1, is a side elevation of my improved syringe.
Figure 2, is a longitudinal section of said syringe with the parts in the position
indicated in Figure 1.
Figure 3, is also a longitudinal section showing the piston and its rod in position
for the ejection of the contents of the syringe.
Figure 4, is a plan view of the piston.
Figures 5 and 6, represent modifications of the piston, and
Figure 7, a modification of the piston rod handle.
The letter, A, refers to the barrel or cylinder of the syringe, constructed of any
suitable material, and in the shape most suitable for the purpose intended. The
nozzle, 1, is formed either by the contraction of the cylinder at the lower end, or by a
separate piece of material set into or on to the end of the barrel, with a thread turned

page_text: in the apex to receive and hold the outer end of the piston rod, also serow threaded.
At the nozzle end of the barrel may be located an opening, 16, for filling the liquid
into the syringe. The head of the cylinder, 2, has three openings, the larger ono, 3,
for the passage of the piston rod; the two smaller ones, 4, and, 5, for the inlet or
outlet of air when the syringe is in use.
The letter, B, refers to the piston rod which is detachable from the piston; at its
lower end, 6, is a serow thread to fit the thread in the apex of the nozzle pioco. When
these are screwed together the rod acts as a stop or cork to the opening, and prevents
leakage or corrosion at this point. A washor, 7, is placed on the end of the piston
rod just below tho collar or flange, 8, and when the rod is scrowed home the washer is
pressed against the inner ond of the nozzle where the threads terminate, thereby
securely sealing the same. The collar, 8, acts both to press the washer home to its
scat on the nozzle, and when the piston rod is withdrawn as a stop to prevent its
ontire withdrawal through the piston. Just above the collar, 8, is cut a crease or
notch, 9, intended to receive the ends of the teeth of a spring plate when the rod is
drawn out and partly through the piston ready for use.
The letter, O, refers to the handle of the piston rod. It is provided with a
shoulder, 10, next which is a washer, 11, intended to fit closely around the rod and to
spread out far enough to cover and close the port holes, 4, and, 5, in the top of the
cylinder, when the rod is pushed down and serowed into the nozzle.
The letter, 1), refers to the detachable piston, which is not rigidly connectel with
the rod until ready to be used; said piston is composed of a pliable washer, 12, and
the upper and lower dises, 13, and 14. The piston may be constructed in several
different ways without departing from the principle of the invention, but the one
preferred and shown is concave below and convex above, laving a lower plate, 13,
stamped into proper form, and a suitable washer, 12, with an opening in the center
just large enough to allow the piston rod to pass and at the same time make a close fit
to prevent the passage of the liquid employed.
The upper plate of the piston is made of spring metal and notched or cut so as to
form teeth, 15, projecting towards its center; the central opening between the teeth
being slightly smaller than the piston rod. When the main part of the rod is drawn
between the teeth, 15, they are spread apart a little more than normally and are
slightly olevated at their points, but when the rod is drawn out to connect with the
piston or until collar, 8, stops tho piston, the teeth will spring into the notch. If,
however, a heavier spring plate wuro used the teeth would grasp the rod firmly enough
to prevent back slipping, even though no notch were cut in the rod. In the
modification shown in Figure 5, tho upper plate is cone shaped, and a packing is
extended across the piston and has an opening in the center for the piston rod. In
this case the packing, 12, acts as a washer to prevent moisture from passing through
the central part of tho piston. Upon the upper side of the packing, and between it
and the upper plate is placed a plate with spring teeth for the purpose heretoforo
described. In Figure 6, the packing ring between the plates has a recess in its centor
in which and between the plates is placed the plate with spring teeth, for the purpose
heretofore described. When the handle is turned to the left until the rod is free from
the nozzle and the rod drawn out until the spring teeth engage with the notch, the
device may be used as a syringe to throw an extinguishing fluid.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declaro that what I
claim is :-
1. The combination of the cylinder having a scrow threndod nozzle with the
detachable piston, the removable screw throadod piston rod, the landlu and its washer
these being close to the cylinder head when the rod is screwed into the nozzle,
substantially as described.
2. The combination of the cylinder having a perforated head and a screw threaded
nozzle, with the removable piston rod provided with a collar or stop and screw on its
end, a washer between the collar and nozzle, a handle on the rod and a washer between

page_text: the handle and the cylinder head, the handle and its washer being normally close to
the cylinder head when the rod is screwed into the nozzle, substantially as described.
3. The combination of the cylinder with the detachable piston, provided with spring
teeth, the rod provided with a groove for engaging with the teeth, and also provided
with a collar and screw thread on its end, a washer betweon the collar and cylinder,
a handle on the rod and a washer between the handle and the cylinder head,
substantially as described.
Dated this 3rd day of July 1888.
ALBERT LESLIE PITNEY.
By Jensen & Son,
77, Chancery Lane, London, W.C.,
Patent Agents.