Improvements in Chimney Pots or Ventilating Terminals.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Chimney Pots or Ventilating Terminals.
I, JOHN WALKER, of 64 Roscommon Street, Liverpool, in the County of
Lancaster, do hereby declare the nature of this invention to be as follows:-
This invention relates to certain improvements in chimney pots or ventilating
terminals. It is designed to prevent down draught, and to induce an
upward current in the chimney or ventilator.
In carrying my invention into effect, I combine with any suitable pot or
terminal, conical air passages or pipes, the larger ends of which are on the outside
of the pot or terminal and the smaller ends inside the flue. The speed of the in-
rushing air as it passes through these conical pipes will be augmented, owing to
the gradually decreasing area of the pipes, and as it is discharged into the flue
will induce an upward current therein which prevents down draught.
In applying the invention to ventilating terminals on board ship, the plan I
prefer is to provide one or more conical air blast pipes arranged centrally in
the flue and supplied with external air by other pipes arranged radially or
laterally round it. The speed of the incoming air will induce an upward current
in the blast pipe. Above the top of the conical blast pipe I place a hood so
arranged as not to impede the upward current of air while acting as a shield,
which causes any water or spray which may be thrown into the flue to be delivered
into the space between the inside of the Hue and the outside of the conical blast
pipe. This space is closed at the bottom but provided with outlet pipes which
convey any water which may fall into the space to the outside. This arrangement
prevents any possibility of water finding its way down the flue.
The invention may be used in connection with my spiral louvre tops or any
other form of terminal, or I may provide it with a top made to turn round by
the wind by which the wind is made to act as an accessory in educting the foul
air, or in the case of a chimney the volatile products of combustion. The casing
or cage of the cowl is provided with side openings to let out the foul air or smoke,
and inside this cage there is the vane acting to induce an upward current through
the flue. On the same spindle on which this vane is mounted on the outside of
the cage, there is an auxiliary vane so arranged as to be rotated by the wind.
So long as the wind is blowing therefore, this external vane causes the internal
vane to rotate and induce an upward current in the flue which is discharged
through the sides of the cage.

page_text: I, JOHN WALKER, of 64. Roscommon Street, Liverpool, in the County of
Lancaster, 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: -
This invention relates to certain improvements in chimney pots or ventilating
terminals. It is designed to prevent down draught, and to induce an upward
current in the chimney or ventilator.
The invention will be understood from the following description, reference
being had to the accompanying drawings, in which,
Figure 1 is a front elevation of my improved chimney pot o: ventilating
terminal;
Figure 2 a cross section through the air passages a;
Figure 3 cross section through the conical air passages or pipes A; and
Figure 4 the invention applied to a terminal with a top made to turn round by
the wind.
Referring to Figures 1, 2 and 3, I combine with any suitable pot or terminal,
conical air passages or pipes, the larger ends of which are on the outside of the
pot or terminal and the smaller ends A¹ inside the flue.
The speed of the inrush-
ing air as it passes through these conical pipes will be augmented, owing to
the gradual decreasing area of the pipes, and as it is discharged into the flue will
induce an upward current therein which prevents down draught.
In applying the invention to ventilating terminals on board ship the plan I
prefer is to provide one or more conical air blast pipes B arranged concentrically
in the flue and supplied with external air by the pipes A arranged radially or
laterally around it. The speed of the incoming air will induce an upward current
in the blast pipe B. I may also provide auxiliary openings a which supply air to
the annular space between the blast pipe B and flue C, through which an induced
air current will be drawn. Above the top of the conical blast pipe I place a
hood D so arranged as not to impede the upward current of air, while acting as a
shield which causes any water or spray which may be thrown into the flue C,
to be delivered into the space H between the inside of the flue C and the outside
of the conical blast pipe B. The pipe B is supported in position in the flue C by
mounting it in the channelled rim 11 projecting from the inside of the flue, and
the space H is closed at the bottom by this channelled rim 1, which however is
provided with outlet pipes which convey any water which may fall into the
channel D to the outside. This arrangement prevents any possibility of water
finding its way down the flue B. The conical pipes A may be made separately
from the flue C and blast pipes B, and fitted into the holes therein, and secured
in any suitable manner.
The invention may be used in connection with my spiral louvre tops (Patent
No. 5404 of 1896) or any other form of terminal, or I may provide it with a top made
to turn round by the wind, by which the wind is made to act as an accessory in educt-
ing the foul air, or in the case of a chimney the volatile products of combustion,
see Figure 4. The casing or cage E of the cowl is provided with side openings to
let out the foul air or smoke, and inside this cage there is the vane F acting to
induce an upward current through the flue. On the same spindle on which this
vane is mounted on the outside of the cage, there is an auxiliary vane G so arranged
as to be rotated by the wind. So long as the wind is blowing therefore, this

page_text: external vane G causes the internal vane F to rotate, and induce an upward
current in the flue B, which is discharged through the sides of the cage E.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
-
1. The improvement in chimney pots or ventilating terminals which consists in
combining with any suitable pot or terminal, conical air pipes or passages A, the
larger ends of which are on the outside of the pot or terminal and the smaller
ends inside the flue, whereby the speed of the inrushing air, as it passes through
these conical pipes, will be augmented owing to the gradually decreasing area of
the pipes, and as it is discharged into the flue will induce an upward current
therein which prevents down draught substantially as described.
2. In chimney pots or ventilating terminals, the combination therewith of air
blast pipes arranged concentrically in the flue and supplied with external air by
other pipes arranged radially or laterally round it, whereby the speed of the
incoming air will induce an upward current in the blast pipe substantially as
described.
3. In chimney pots or ventilating terminals having concentric air blast pipes
therein, placing above the top of the conical blast pipe a hood so arranged as to
act as a shield which causes any water or spray which may be thrown into the flue
to be delivered into the space between the inside of the flue and the outside of the
blast pipe, and supporting this flue at the bottom by the channelled rim D¹ pro-
vided with outlet pipes which convey any water which may fall on the bottom to
the outside substantially as described.
D
1 1911.
Danamba 1000
WM. P. THOMPSON & Co.,
Patent Agents,
Of Liverpool, Manchester, Birmingham, and London.