Improvements in Chimney Tops for Preventing Down Draught.
Year: 1899

page_text: Date of Application, 17th Nov., 1899
Complete Specification Left, 15th Aug., 1900-Accepted, 3rd Nov., 1900
PROVISIONAL SPECIFICATION.
Improvements in Chimney Tops for Preventing Down Draught.
I, JOHN JOHNSTON GREEN, of 16, Bank Street, Darwen, in the County of
Lancaster, Sanitary Engineer, do hereby declare the nature of this invention
to be as follows:
-
My invention has reference to chimney tops, the object being to prevent or
lessen down draught therein. In constructing a chimney top according to
my invention I form the upper portion thereof of diagonal arms having down-
wardly branching passages leading from the central shaft to the atmosphere, and
upwardly branching passages leading from the central shaft into said downwardly
branching passages, as shewn and described in the drawings and Specification of
prior Letters Patent granted to me on the 13th day of March, A.D. 1899,
No. 5408.
In combination with the above mentioned diagonally branching arms forming
the upper portion of the chimney top, I employ a convenient number of > shaped
rings or louvres, the apex of the > being towards the vertical centre of the pot.
The rings are so disposed tuat convenient openings are left between the outer
edges or bases thereof, through which atmospheric air can enter and pass up the
central shaft along with the smoke issuing from the chimney.
By the above combination, it will be found that down draught will be greatly
lessened or entirely prevented, and up draught will be assisted and that "smoking i
of chimneys to which my improved tops are applied will not take place.
1000
TASKER & CROSSLEY,
Patent Agents, Halifax, Agents for Applicants.
Improvements in Chimney Tops for Preventing Down Draught.
I, JOHN JOHNSTON GREEN, of 16, Bank Street, Darwen, in the County of
Lancaster, Sanitary 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 has reference to chimney tops, the object being to prevent or
lessen down draught therein. In constructing a chimney top according to
my invention I form the upper portion thereof of diagonal arms having down-
wardly branching passages leading from the central shaft to the atmosphere, and

page_text: upwardly branching passages leading from the central shaft into said downwardly
branching passages, as shewn and described in the drawings and Specification of
prior Letters Patent granted to me on the 13th day of March, A.D. 1899,
No. 5408.
In combination with the above mentioned diagonally branching arms forming
the upper portion of the chimney top, I employ a convenient number of louvres,
or shaped rings, the apex of these louvres, or shaped rings, being toward's
the vertical centre of the pot. The rings are so disposed that convenient openings
are left between the outer edges or bases thereof, through which atmospheric air
can enter and pass up the central shaft along with the smoke issuing from the
chimney.
The accompanying drawings illustrate my improvements in chimney tops:
The chimney top to which my improvements are applied is constructed with
diagonal or side arms a having downwardly branching passages 6 leading from
the central shaft above to the open ends c of the diagonal or side arms, and
upwardly branching passages d leading from the central shaft e at the bottom of
the chimney top into said downwardly branching passages b somewhat as shewn
and described in the Specification of prior Letters Patent granted to me on the
13th day of March, A.D. 1899, No. 5408.
My invention consists in combining with a chimney top having the aforesaid
side or diagonally branching arms a, any suitable and convenient number of
louvres (Fig. 1,) which, are situated above the diagonally branching arms, these
said louvres inclining upwardly from the outside of the chimney top toward the
vertical centre of same and being supported at intervals around the chimney pot
by ribs or thin walls or partitions the whole preferably forming an integral portion
of the chimney top.
The louvres are arranged one above the other and at suitable distances apart
so as to leave convenient openings g between the outer edges or bases thereof for
the free admission of atmospheric air which, by reason of said louvres, is con-
strained to pass forward in an upward direction into the central shaft at the
top of the chimney where it meets with the smoke issuing from the chimney
through the passages d and b and carries it out of the chimney. The central
openings at the apices of the louvres f may be of different sizes or areas each
being slightly larger than the one next below and the lowest slightly larger than
the central shaft or outlet from the passages b. Although I prefer to employ the
ordinary form of louvres f, I would have it understood that, if desired, as an
alternative shaped rings f having their apices toward the vertical centre of
the pot may be employed instead of the louvres f as shewn at Fig. 2.
By the above combination and construction of chimney top down draught is
considerably lessened or prevented altogether and up draught assisted, whereby
liability of chimneys "smoking" is minimised.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
In a chimney top, the combination of diagonal or side arms having downwardly
and upwardly branching passages band d and louvres such as for equivalent
> shaped rings arranged and constructed substantially as herein described and
for purposes set forth.
TASKER & CROSSLEY,
Patent Agents, Halifax, Agents for Applicant.