A Boiler for a Steam Driven Velocipede or like Vehicle.
Year: 1896

page_text: Date of Application, 17th June, 1895
Complete Specification Left. 16th Mar. 1897-Accepted 8th May 1897
PROVISIONAL SPECIFICATION.
A Boiler for a Steam Driven Velocipede or like Vehicle.
I, EUGENE LABITTE, of No. 177, Boulevard Pereire, Paris, France, Engineer,
do hereby declare the nature of this invention to be as follows:-
My invention relates to a light and compact construction of boiler, presenting
large heating surface and capable of rapidly generating and superheating steam
for driving a velocipede or like vehicle. For this purpose, I arrange within a
double cylindrical casing, in its upper part, a number of tiers of spiral tubes each
tier connected to the next so as to form a continuous pipe, and in the lower part of
the casing a helical pipe communicating with the lowest of the spiral tubes above.
At the bottom of the casing is a fire grate to which fuel is fed from above through
a pipe which passes down the central space within the spiral tubes. The fire heats
the helical pipe which surrounds it, and the products of combustion after ascending
among and heating the spiral tubes, escape by lateral holes at the top of the inner
casing into the annular space within the outer casing and descend that space to an
outlet flue at the bottom. The feed water is supplied to the highest of the spiral
tubes, and, descending through these tubes successively, becomes heated and
vaporised, and the steam descending the helical pipe becomes superheated and is
led from the lowest convolution of the helical pipe to the engine. The feed water,
instead of being pumped directly into the boiler, may he pumped into an air vessel
which communicates with the boiler. To this air vessel is connected a bent tube
like the tube of a Bourdon pressure gauge. The closed end of this tube is
connected to a feed valve, which it closes more or less according as the tube
becomes more or less unbent, the feed being thus regulated according to the
pressure.
Dated this 17th day of June 1896.
ABEL & IMRAY,
Agents for the Applicant.
I, EUGÈNE LABITTE, of No. 177 Boulevard Pereire, Paris, France, Engineer,
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:-
My invention relates to a light and compact construction of boiler, presenting
large heating surface and capable of rapidly generating and superheating steam
for driving a velocipede or like vehicle. For this purpose, I arrange within a
double cylindrical casing, in its upper part, a number of tiers of spiral tubes each
tier connected to the next so as to form a continuous pipe, and in the lower part of
the casing a helical pipe communicating with the lowest of the spiral tubes above.
At the bottom of the casing is a fire grate to which fuel is fed from above through
a pipe which passes down the central space within the spiral tubes. The fire heats
I Frice su I

page_text: the helical pipe which surrounds it, and the products of combustion after ascending
-among-and-heating the spiral tubes, escape by lateral holes at the top of the inner
casing into the annular space within the outer casing and descend that space to an
outlet flue at the bottom. The feed water is supplied to the highest of the spiral
tubes, and descending through these tubes successively, becomes heated and
vaporised, and the steam descending the helical pipe becomes superheated and is
led from the lowest convolution of the helical pipe to the engine.
Fig. 1 of the accompanying drawings is a vertical section, and Fig. 2 is a plan
of a boiler according to my invention,
Fig. 3 is an elevation of the coils and
Fig. 4 is a plan of the fire grate.
The upper coil A which is supplied at a with the feed water is connected at its
lower end with the superheating coil B, which consists of straight parts connected
by bent parts, each convolution forming a triangle which is turned partly round
relatively to the next, so that between the successive convolutions there are narrow
passages for the flame and combustion gases, which play upon both the inner and
the outer surface of the coil. From the lowest convolution of B the superleated
steam is led to the steam engine by a pipe b which ascends through the combustion
chamber as indicated by the dotted lines in Fig. 1.
The combustion gases pass through holes c at the top of the chamber into the
annular spaced within the casing, and descend to the outlet e leading to the
chimney.
The fire grate consists of two sets of bars and k which alternate and are
carried on two rings f and g respectively. The ring is attached to a ring m
which rests by segments n on a flange o fixed to the base of the boiler casing.
This flange has segments p cut out of it to allow the segments à to pass up, these
being then turned partly round so as to be held in the manner of a bayonet joint.
The ring g which carries the bars k is held outside the ring f by turn buckles
When it is
pivotted on f. Other brackets t serve to hold the ring g up to m.
desired to shake out ash or small cinders the ring m is turned a little to and fro
between suitable stops thus shaking the grate. In order to clear the grate from
larger pieces the brackets t and the turn buckles rare disengaged and the ring g
with the bars is lowered thus leaving larger spaces between the bars h.
descends by the central tube, the shake of the vehicle ensuring its descent.
Fuel
Between the boiler and the engine may be arranged a slide valve by which the
steam is directed either to the cylinder or to the escape pipe or partly to each
according to the engine power required. In case very little or no power is
required as in descending a slope, the feed may be cut off, and as there is no longer
exhaust in the chimney the fire becomes deadened.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
1. The combination of the upper vaporising coil with the lower superheating
coil, substantially as described.
2. The construction of the superheated coil of approximately triangular
convolutions each set partly round relatively to the next, substantially as and for
the purpose set forth.
3. The construction of the fire grate of two sets of alternating bars each set
carried on a separate ring, so that one set can be removed by lowering the ring
which carries it, substantially as described.
Dated this 16th day of March 1897.
ABEL & IMKAY,
Agents for the Applicant.