Improvements in Caps or Heads for Ventilating and Flue Shafts.
Year: 1888

page_text: Date of Application, 4th July, 1888
Complete Specification Left, 3rd Apr., 1889-Accepted, 4th July, 1889
PROVISIONAL SPECIFICATION.
Improvements in Caps or Heads for Ventilating and Flue Shafts.
L, FREDERICK HENRY SMITH of the "Collars" East End, Finchley, in the County
of Middlesex, Gentleman, do hereby declare the nature of this invention to be as
follows:-
This invention has for its object improvements in caps or heads for ventilating and
flue shafts.
To prevent down draft occurring in such shafts in sudden puffs resulting from the
action of the wind at the outlet I provide such shafts with the improved caps or
heads.
The cap or head is of the following construction:-at the top of the upright or
rising flue a hollow globe larger in diameter than the flue is provided and around
the sides of this globe outlets are formed. At each outlet a pipe is connected and
these pipes are curved upwards and they support a second hollow globe similar to
the first and vertically over it. The pipes are attachel around the sides of this
upper globe and they communicate with its interior so that the draft ascending the
shaft into the lower globe travels on through the side pipes into the upper globe
and ultimately the escape for the current of air is by an aperture in the under side
of the upper globe. The two globes are set at such a distance apart that the space
between thein is sufficient for the escape of the air but not in excess of the
requirements for the speed of the outgoing current should be maintained until the
escaping current has taken a horizontal course and so passes away from the cap
or head.
1
T11000
CARPMAEL & Co.,
Agents.
COMPLETE SPECIFICATION.
Improvements in Caps or Heads for Ventilating and Flue Shafts.
I, FREDERICK HENRY SMITH of the "Cedars" East End Finchley in the County
of Middlesex Gentleman, 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 has for its object improvements in caps or heads for ventilating and
flue shafts.
To prevent down draft occurring in such shafts in sudden puffs resulting from the
action of the wind at the outlet I provide such shafts with the improved caps or
heads. The cap or head is of the following construction-at the top of the upright
or rising flue a hollow globe larger in diameter than the flue is provided and around
the sides of this globe outlets are formed. At each outlet a pipe is connected and
these pipes are curved upwards and they support a second hollow globe similar to
the first and vertically over it. The pipes are attached around the sides of this
upper globe and they communicate with its interior so that the draft ascending the
shaft into the lower globe travels on through the side pipes into the upper globe
and ultimately the escape for the current of air is by un aperture in the underside
of the upper globe. The two globes are set at such a distance apart that the space
between them is sufficient for the escape of the air but not in excess of the require-
ments for the speed of the outgoing current should be maintained until the escaping
current has taken a horizontal course and so passes away from the cap or head.

page_text: In order that my said Invention may be more fully understood and readily carried
into effect will proceed to describe the drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a plan of an apparatus constructed according to my invention.
Figure 2 is an elevation.
Figure 3 is a transverse section on the line X X Figure 2 and—
Figure is a vertical section on the line Y Y. Figure 1.
A is the rising flue leading into the hollow globe B. This globe is connected by
pipes (C. C. to a second hollow globe D. which at its under side is provided with an
outlet E, the direction of the current being shown by arrows, Figure 4.
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 |
claim is
1. In caps or heards for ventilating and flue shafts the combination of a hollow
vessel at the end of the shaft and of larger diameter than it, pipes or passages
connecting the id vessel with a second vessel of similar dimensions and an outlet
from the second ssel directed towards the first vessel.
2. (aps or he is for ventilating and flue shafts substantially as described and
represented in the annexed drawings.
Dated this 23rd day of March 1889.
FREDK. H. SMITH.