Improvements in Draught Inducing Devices for Chimneys or Smoke Stacks.
Year: 1896

page_text: Date of Application, 5th Sept., 1895-Accepted, 31st Oct., 1896
[Communicated from abroad by AKERS MEKANISKE VARKSTED, of Dokveien 1,
Christiania, in the Kingdom of Norway, Shipbuilders.]
Improvements in Draught Inducing Devices for Chimneys or Smoke
Stacks.
I, WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake & Co., Patent
Agents, 45 Southampton Buildings, in the County of Middlesex, 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 present invention is to provide a simple and effective means
for inducing and increasing the draught in smoke stacks or funnels, especially
those in use on board steamships or elsewhere in which the natural draught is
insufficient, on account of the stack being too short as is generally the case on
steamships.
The invention consists in combining with the stack an air pipe, which opens
within the stack in an upward direction, preferably as far below the top of the
chimney as possible, said air pipe or channel opening at the other end to the
atmosphere and being provided at its cuter extremity with a funnel shaped
mouth, that may be turned in a horizontal plane so as to be always open to
the wind.
In the accompanying drawings several constructions of our improved draught
inducing device are shown, but it will be understood that the constructions shown
are only examples, and variable without departing from the spirit of the
invention.
In the drawings
Figure 1 shows a vertical section of a smoke stack provided with one form of the
improved draught inducer.
Figure 2 is a horizontal cross sectional view of the same.
Figure 3 is a vertical section of the lower part of a smoke stack provided with
another form of the improved draught inducer and
Figure 4 is the corresponding cross section.
Figures 5 and 6, 7 and 8, 9 and 10, 11 and 12 are vertical and transverse
sections respectively of other forms for the draught device.
Referring to Figures 1 and 2 V is an air pipe mounted on the outside of the
stack O so that it may be together with its mouth U turned around its axis
whereby the mouth is made to face the wind.
B is a curved pipe opening at the centre of the stack, so that it conducts the air
forced down the air pipe V to the stack, where it is ejected in an upward direction,
acting thereby in the same manner as a jet blower.
Figures 3 and 4 show a similar arrangement the only difference being, that there
are two pipes instead of one; by this arrangement one of the mouths may always
be turned to receive the wind from whichever direction it blows.
Figures 5 and 6 show another form of air inlet to the stack, the pipe V leading
in this instance, to a chamber or chaunel C surrounding the stack, from which
channel upwardly directing conduits D lead to the inside of the said stack. In
this case the air pipe V may be made stationary relatively to the channel C the
latter being fitted loosely on the outside of the stack, so that it may be turned in
either direction together with the air pipe V; or the latter may be wholly dispensed

page_text: with and a mouth or opening fixed directly on the chamber C, although we prefer to
employ the construction shown in order to catch more wind.
Figures 7 and 8 show another form of the blast nozzle, a double cone E being
placed above the nozzle opening. Figures 9 and 10 show still another form of the
nozzle, there being in this case, a hollow cone F placed above the nozzle after the
manner of an injector nozzle. The construction may vary in other ways, as any
kind of nozzle used for similar purposes may be used in carrying out the
invention.
Figures 11 and 12 show a construction in which the air pipe is a channel placed
inside the smoke stack and has a segmental cross section. In this case the stack O
together with the said channel is adapted to be turned around its axis by means of
a worm S and a worm wheel or ring T fixed on the stack.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondents, I declare that what I claim is :-
1. In a draught inducing device the combination with the chimney or smoke-
stack of an air duct leading to the interior of the chimney or smoke stack and
having its jet or blast opening or openings turned in an upward direction, the said
air duct opening to the atmosphere at its opposite end and having its mouth or
opening arranged so that it may be turned to face the wind.
2. A draught inducing device for chimneys or smoke stacks comprising an
opening or mouth, movable in a horizontal plane; a pipe or duct leading from said
mouth or opening to a point of the interior near the lower end of the chimney or
stack and a nozzle on said pipe inside the stack.
3. A draught inducing device for chimneys or smoke stacks comprising two
mouths or openings placed on opposite sides of the stack and movable in a horizontal
plane, pipes leading from said mouths or openings to a point of the interior of the
stack near the lower end thereof, and a nozzle on the junction of the said pipes
within the stack.
4. A draught inducing device for chimneys or smoke stacks comprising an air
chute or funnel, an annular chamber or channel around the stack and inlet openings
from the said chamber to the stack provided with deflectors to direct the air
upwards into the stacks, the said air chute funnel being made movable in a
horizontal plane so that it may be turned to face the wind.
5. A chimney or smoke stack provided with an air duct and a mouth through
which the duct opens to the atmosphere, said air duct leading to the interior of the
stack and being provided at a point considerably below the top of the stack with a
blast nozzle, the stack together with the said air duct and connections being arranged
so that it may be turned around its own axis.
6. A draught inducing device substantially as and for the purpose described
with reference to the accompanying drawings.
Dated this 5th day of September 1896.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.