Improvements in the Construction of Outlet Ventilators for Buildings.
Year: 1893

page_text: Date of Application, 2nd Aug., 1893
Complete Specification Left, 2nd May, 1894-Accepted, 16th June, 1894
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Outlet Ventilators for
Buildings.
I, THOMAS WHITEHEAD of 77 Portland Street, Southport in the County of
Lancaster, Builder, do hereby declare the nature of this invention to be as
follows:-
:-
This invention relates to outlet ventilators for buildings, which will discharge
air or gas into the atmosphere without the wind being able to blow down them.
In carrying my invention into effect, I provide a turret and louvre top, but the
bottom portion or tube on which the louvre top is mounted is provided inside with
louvres, so constructed as to effectually prevent any down draught, that is, ordinary
louvre outlet ventilators are constructed on the principle of Venetian shutters or
blinds, but by means of a circular tube with louvres inside, between which the
vitiated air alternately passes up and down, my object is attained. These louvres
are formed of small cones fastened to a central support and larger truncated cones
secured to the side of the tube with a small passage between each for ventilation.
Dated this First day of August 1893.
THOMAS WHITEHEAD.
COMPLETE SPECIFICATION.
· Improvements in the Construction of Outlet Ventilators for
Buildings.
I, THOMAS WHITEHEAD of 77 Portland Street, Southport in the County of
Lancaster, Builder 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 outlet ventilators which shall discharge air or gas into
the atmosphere without the wind being able to blow down them.
The invention will be understood from the following description, reference being
had to the accompanying drawings and to the letters and numerals marked thereon
in which :-
Figure 1 is a front elevation, partly in section, of my ventilating terminal:
Figure 2, an inverted plan:
Figure 3, a ventilator suitable for drains, water closets, soil pipes or gas fires ⚫
Figure 4, a ventilator suitable for shop windows; and
Figure 5, a chimney top.
Similar letters refer to like parts in all the figures.
Referring to Figure 1-
A, is a turret and louvre top on the summit of the ventilating tube or shaft B,
the rotatable portion a being provided with a vane a', whereby it turns round with
any change in the direction of the wind. The circular tube or shaft B does not
deliver the air directly upwards but is provided inside with louvres formed of small
cones C fastened to the central support c, and truncated cones D secured to the
side of the tube B, with a small passage between them for ventilation. The wind
cannot blow down the shaft B, as it is stopped by the hood A and by the louvres
in the said shaft. The impure air passing up the flue B, impinging against the
under side of these louvres, passes through the passages in the direction shown by
Pred]

page_text: the arrows, and is delivered through the louvres in the hood. The hood itself is in
fact an accessory in educting the vitiated air.
The examples shown in Figures 3 and 4 differ mainly in the hood A, which, in
Figure 3, is made in the shape of a fixed conical cap, and, in Figure 4, as a
revolving bonnet.
I have described the above ways in which the invention may be carried into
effect, but it is obvious that my idea may be applied to chimney tops and stove pipe
terminals, as shown in Figure 5, the arrangement of the louvres in the flue being
almost precisely the same. The hood may be omitted and a portion of the side of
the terminal madé removable, if desired, so as to enable it to be more easily cleaned
⚫of Boot.
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 ventilating terminals or chimney tops, which consists in
providing the interior of the shaft or flue with louvres formed of deflecting cones
superimposed one above the other with a passage between each, substantially as
described, whereby down draught is prevented and impure air or smoke is enabled
to escape.
2. The special arrangement and combination of parts forming my improved
ventilating terminal or chimney top, substantially as described.
Dated this 1st day of May 1894.
WM. P. THOMPSON & Co.,.
Of Liverpool, Manchester, Birmingham, Nottingham, and London, .
Patent Agents.