An Improved Fire Engine.
Year: 1892

page_text: Date of Application, 17th Mar., 1892-Accepted, 11th Mar., 1893
COMPLETE SPECIFICATION.
An Improved Fire Engine.
I, JOHANN NAGY in Nagy Szalunta Biharer County, Kingdom of Hungary
Foreman, do hereby declare the nature of my 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 present invention relates to improvements in the driving gear
and the construction of the valves of hand fire engines by means of which a con-
siderable increase of power is attained so that four barrelled fire engines or other
similar pumps can be driven by hand.
The improvements consist firstly in the novel driving beams which in spite of
their great length have a considerably smaller stroke than is the case with ordinary
levers of like length and like stroke of the pump pistons secondly in the simple
construction of the valve casing in which only two suction two pressure valves are
arranged for a four barrel pump whereby all four valves have a common and readily
accessible seat.
The accompanying drawing represents the improvements applied to a four
barrelled hand fire engine Fig. 1 being an elevation, Fig. 2 a plan or top view;
Fig. 3 a section on the line xx in Fig. 1. Fig. 4 a section on the line y y in Fig. 1,
Fig. 5 a cross section of the valve casing and Fig. 6 a detail view of the operating
lever.
The fire engine is as represented in Fig. 1 mounted on an formed frame a by
means of which the same can be attached to a suitable carriage or frame. The
four pump barrels are as shown in Fig. 2 and 4 arranged pairwise on both sides of
the feet a of the frame and are connected to a common canal c which latter enters
the valve casing d on the one side.
The pump barrels are attached to the frame a by means of lugs e cast onto the
canals c.
The valve casing d carries the pressure air chest f. At the top of the
frame a are the two armed beams g which turn on the fulcrum h and are connected
to the piston rods i whilst an angle lever j turning around the fulcrum k is attached
to each of the ends of the beams g.
The long arm of the angle lever j forms an extension of the beam g and ends in
the well known bifurcated handle holder l. The shorter arm of the angle lever
which projects upwards is so coupled to the upper lever m that the connection can
be readily released said lever m being arranged at suitable distance above the
fulcrum of the beams 9 on the fulcrum n. By means of the peculiar lever com-
bination which resembles the Watts parallelogram I attain the result that during
the oscillating movement of the levers for driving the pump the levers j will
participate in the movement of the beams g, the movement of the lever, being
represented by the dotted lines in Fig. 1 at the ends of its stroke.
Fig. 1 also shows how much the stroke of the handle is reduced by means of
this lever combination in comparison with the stroke of an ordinary long two armed
lever (shown by the dot and dash lines in Fig. 1).
As this lever combination permits of the use of long lever arms by comparatively
short stroke a considerable power can be exerted which renders the application
of four pump barrels possible.
During the transport or when not in use the coupling between the levers m
and can be readily released and the lever j as shown by the left hand side of
Fig. 1, be flapped down so that the length of the levers is reduced by one half.
The coupling between the levers m and j is effected by means of a horizontal
bolt n arranged in the bifurcated end of the lever j and gearing into the

page_text: bifurcated end of the lever m the bolt being held in position by means of a spring
splint o as shown in Fig. 6.
A further improvement in this fire engine or suction and pressure pump consists
therein that the four pump barrels simultaneously suck and press through a common
valve case and for this reason two barrels 6 located on the same side of the engine
work together each two such barrels standing, as already mentioned in communica-
tion with the conical valve casing d by means of a canal c.
The conical valve carrier of cruciform section (Fig. 5) is arranged in the
casing d being firmly and tightly pressed into the same by means of a screw q
passing through the bow or strap p so that four chambers s¹³s are formed.
The four wings of the conical valve carrier r are provided with openings t closed
by the valves ¹¹ and s s the said wings being arranged at an angle of 90° to each
other.
The two pressure valves s, s, are arranged in the pressure chamber s¹ which
communicates with the pressure service u, whereas the chambers and s³ contain
each a suction valve ³ one of the canals c opening into each of these chambers s²,
whilst the fourth or suction chamber s stands in communication with the suction
service v.
The operation of the valves and the entire engine will be readily understood
from the accompanying drawing.
When the beams are operated the two left pump barrels will suck fluid through
the left canal c the chamber valve r¹ and the chamber out of the suction
service whereas the right hand two pump barrels press fluid through the canal c
chamber valves and chambers into the pressure service u. At the return
stroke of the beams the operation of the parts is reversed.
Having now particularly described and ascertained the nature of my said inven-
tion and the manner in which the same is to be performed I declare that what I
claim is :
A hand fire engine with four barrelled suction and pressure pump characterised:
1. By the extension of the beams g, to which the piston rods are coupled, by
means of an angle lever j with unlike long arms having its fulcrum at the end of
the beam 9 whilst its short arm projects upwards and is coupled as described to the
lever m which has its fulcrum above the beam so that the long arm of the lever j
moves up and down parallel to itself, thus reducing the stroke of the levers sub-
stantially as set forth in the foregoing Specification.
2. By the cock like valve casing d communicating by means of two canals c with
two like and with each other working pump barrels said casing d being closed by
a conical valve seat of cruciform cross section and pressed into the casing by the
screw in the bow or strap p (Fig. 5) whereby the interior of the casing is
divided by four wings of the valve seat provided with openings t, into four
chambers of which the one s' contains the two pressure valves ss and
corresponds with the pressure service u, whereas the two lateral chambers s² 5ª
communicated each with one of the canals and contain each a suction valve r¹ whilst
the chamber is in communication with the suction service substantially as and
for the purpose specified.
0
3. The construction of my improved four barrelled pump and the apparatus of
the same as hand fire engine substantially as described.
Dated this Mauch 1000
HORN & SON,
Applicant's Agents.