A Portable Engine.
Year: 1895

page_text: Date of Application, 4th Oct., 1895-Accepted, 30th Nov., 1895
A Portable Engine.
I, ERNST BUCHHOLTZ of 59 Laugestrasse Warsaw Russia, Merchant, 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 this invention is a portable engine in which an upright boiler and
a condenser are structurally contained within a water tank and so that the water
therein takes up the surplus heat of the firebox and the surplus exhaust steam.
Fig. 1 of the accompanying drawings is vertical longitudinal section on line ab
of Fig. 3 of such a portable engine.
Fig. 2 is vertical section on line c d of Fig. 3.
C
Fig. 3 is a plan with the top or head of the boiler removed.
Fig. 4 is plan of the carriage and of a fan and
Fig. 5 a vertical section on line e f Fig. 3.
The water tank 1 which is of square shape and rests on the carriage frame with
two wheel axles serves to receive the feed water.
Two cylindrical shells 2 and 3
are riveted into the tank one behind the other the large cylinder 2 being the boiler
shell and the small cylinder 3 receiving the condenser and a fan.
In front of the tank and upon the front axle a steam engine 4 is fixed.
The lower firebrick lined part of the boiler shell 2 forms the firebox. 5 is the
grate and 6 the ash pan which can be closed airtight by the flap 7, that also serves
to regulate the air draught.
As the firebox is surrounded by the water in the tank ! it is insulated towards
the outside and thus takes up the surplus heat.
The boiler proper arranged inside the upper part of the shell 2 consists of several
concentric tube coils 8 and of a small cylinder 9 arranged inside of the coils.
This cylinder serves both as steam generator and steam collector. Within the
small boiler 9 there is another smaller cylinder 10 see Fig. 1. with very narrow
ring space between the two. 11 is a sheet iron ring reaching into the upper open
end of the cylinder 10 and provided with a flange held fast between the head and
upper flange of the boiler 9. There is a short distance between the ring 11 and
the said head and also between the cylinder 10 and the ring 11.
The feed water is supplied from below to the space between the boiler 9 and the
ring 10 and to the coils 8. For this purpose the lower ends of the coils and the
lower end of the boiler 9 are connected to a pipe 12 Fig. 2 which passes across
through the shell 2 and communicates on one side with the feed pump and on the
other side with a gauge glass. The steam evolved in the coils enters a pipe 13
Fig. 1 and then the central pipe 14 passing down the latter and then by the
lateral branch pipes 15 enters the narrow space between the cylinder 10 and
the boiler 9 where it mixes with the steam evolved in said space and passing
upward is dried by contact with the hot inner wall of the boiler 9 which on the
outside is exposed to the heat of the firebox gases. The dry steam then passes
down directed by the ring 11 into the inside of the cylinder 10 and thence through
the upper pipe 16 provided with stop valve 17 and safety valve 18 into the steam
engine 4.
The boiler shell 2 containing the fire place and the steam generator terminates
above in a head which carries the chimney and can be taken off in order that the
coils may be thoroughly cleaned from soot and ashes.

page_text: The steam engine 4 is covered above by a detachable housing 19 to prevent loss
of heat to protect the working parts against dust and to catch the oil that may be
thrown off.
The exhaust steam goes off through the pipe 20 Figs. 3 and 5 passing up through
the water tank 1 and thence into the central pipe 21 of the condenser which latter
consists of several superposed spiral tubes 22. The exhaust traverses the uppermost
spiral from inside to outside, then the middle spiral from outside to inside, then
down through the central pipe 21 and finally passes through the bottom spiral from
inside to outside.
During this passage the exhaust steam is condensed by an air current produced
by the fan 23 at the bottom of the shell 3. The condense water collects in the
pipe 24 Fig. 3 and is drawn by a pump at 28 worked from the pulley 25 and forced
by it into the steam generator.
The surplus exhaust steam flows off above the condenser by the bent pipe 26
Fig. 5 into the water tank 1 where it comes in contact with the water and is
condensed.
The fan 23 is driven by bevil wheel gearing and strap from the governor 27
which for this purpose is shaped like a strap pulley. The aforesaid pump 28
which along with the condense water also draws water from the tauk 1 receives
motion from the nave of the fly wheel 29.
The steam boiler is provided with the required fittings such as two safety
valves 18, glass gauge, two gauge cocks, and pressure gauge and is also fitted with
a hand feed pump besides the aforesaid feed pump.
The water heating surface of the steam generator is about twenty times the
area of the grate.
This portable engine has the following advantages:
1. Lightness on an average about half the weight of the ordinary ones of same
power, in consequence it can be run easier on bad roads or on soft arable ground.
2. Quick starting because of the small weight of water in the steam boiler.
3. Small consumption of water which is of very great importance where the
water has to be fetched a long way as is mostly the case when the portable engine
is used for agricultural purposes.
4. Feeding of the steam boiler almost entirely with condense water.
5. Economy in working owing chiefly to the saving in fuel caused by the
condensation and the short time required for getting up and letting down the
steam.
6. Bringing down the danger of explosion to the minimum because of the
relatively small water space and large steam space.
7. The great steadiness of the apparatus when at work because of the vertical
engine being arranged right over the front axle.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be perforined I declare that what I
claim is:-
1. A portable engine in which an upright stem generator and a condenser are
Structurally contained within a water tank in such manner that the water in the
latter absorbs the surplus heat of the fire box and the surplus exhaust steam
substantially as set forth.
2. A steam generator structurally contained within a water tank and consisting
of concentric tube coils and a double boiler 9, 10 arranged within the innermost
coil and serving as steam producer and steam collector substantially as set forth.
3. A condenser structurally contained within a water tank and formed of
superposed tube spirals enclosed in a shell which passes through the water tank,
the exhaust steam traversing the coils in alternate directions, and being cooled
by an air current from a lan at the lower end of the shell substantially as set
forth.

page_text: 4. A portable engine as firstly claimed in which the vertical engine is arranged
right over the front axle for furthering the steadiness while working.
5. The construction of portable engine shewn on the drawing.
Dated this 4th day of October 1895.
JENSEN & SON,
77 Chancery Lane, London, W.C., Patent Agents.