Improvements in Chimney Tops."
Year: 1897

page_text: "Improvements in Chimney Tops."
I, WILLIAM THOMAS NORRIS, of 333 Lenton Boulevard, in the Borough of
Nottingham, Builder, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in chimney tops, and it is has for its object
the formation of such tops so as to more effectually prevent down draughts.
In carrying out this invention the chimney top is made up of three main parts that
is a lower portion an intermediate part or casing, and an upper part or crown.
The lower part may be formed with a square, circular or other suitably shaped
base in plan to fit on the brickwork and an upper cylindrical or conoidal part of
preferably less diameter than the base and of a suitable height.
At the point where the cylindrical or conoidal part springs from the base, it is
formed preferably with a curve having a convenient radius, so as to form a
deflector.
The intermediate casing is formed cylindrical or conoidal and its lower end fits
over the cylindrical or conoidal part of the lower part, the diameter of the two at
this point being arranged to allow an air space or inlet all round.
The lower edge of the intermediate casing is formed with a suitable number of
peaks, the space between the peaks being preferably curved upwards so as to increase the
space between the lower edge of the intermediate casing and the base of the lower
part at those points.
This intermediate casing is connected to the lower part by lugs or brackets
preferably placed at or near the points of the peaks on the lower edge of the
intermediate casing.
The upper part of the intermediate casing is surmounted by a crown which may
be either of the ordinary form or be formed with peaks on its lower edge in the same
manner as the intermediate casing.
1007
BOULT & WADE,
Agents for the Applicant.
I WILLIAM THOMAS NORRIS, of 333 Lenton Boulevard, in the City of Nottingham,
Builder, do hereby declare the nature of this invention and in what manner the
[Price 8d.1

page_text: same is to be performed, to be particularly described and ascertained in and by
the following statement :-
This invention relates to improvements in chimney tops and it has for its object
the formation of such tops so as to more effectually prevent down draughts.
The invention will be best understood by reference to the accompanying drawings,
in which
Fig 1 is an elevation, and
Fig
a vertical section of a chimney. top constructed according to my invention.
Fig 3 is a horizontal section taken on line X X of Fig 1.
Like letters indicate like parts throughout the drawings.
In carrying out this invention the chimney top is made or built up of three
main parts, that is a lower part A, an intermediate part or casing B, and an upper
part or crown C.
The lower part A may be formed in plan with a square, circular, or other suitably
shaped base A¹, to fit on the foundation or brickwork, and an upper cylinderical or
conoidal part A² of reduced diameter as shown.
Where the conoidal part A2 springs from the base A¹ it is formed with a curved
surface A³ to act as a deflector.
The intermediate part or casing B may be formed cylindrical or conoidal as shown,
and its lower end fits over the conoidal part A2 of the base A. The internal diameter
of the bottom of the casing B is however greater than the external diameter of
the conoidal part A2, and an air space or inlet is thus formed at this point all round
the conoidal part, through which inlet, a current of air is deflected by the curved
surface A3 on the lower part A.
The intermediate part or casing B is mounted on brackets D secured to or formed
integrally with the part A. and to increase the air inlet space, the lower edge of the
casing B may be cut into an arch shape, between each of the said brackets as shown
at E.
Mounted on the upper part of the casing B is the crown C. which may be of the
ordinary form as shown, or its lower edge may be formed with arched parts between
the supporting brackets, in the same manner as the lower edge of the casing B.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1 In a chimney top the combination with a base provided with a conoidal part
such as A2 and a deplecting surface such as A3 of a casing such as B the lower edge
of which is formed with arched parts between the supporting brackets substantially
as described.
2 In a chimney top the combination with a base A provided with a conoidal part
such as A2 and a deflecting surface such as A³ of a casing such as B and a crown C
surmounting the casing B substantially as described.
3 The combination and arrangement of parts constituting the complete chimney
top substantially as described and illustrated in the accompanying drawings.
Dated this 31st day of December 1897.
WILLIAM THOMAS NORRIS.
Boult & Wade,
Agents for the Applicant.