An Improved Ventilator.
Year: 1895

page_text: Date of Application, 11th Mar., 1895
Complete Specification Left, 3rd Dec., 1895-Accepted, 4th Jan., 1896
усциталот.
I HENRY SAMUEL BAGSHAW 14 Star Hill, Rochester in the County of Kent
Zinc Worker and Ventilator Manufacturer do hereby declare the nature of this
invention to be as follows:-
A metal plate roof ventilator having the head thereof formed with a cluster of
four or more vertical tubes having long vertical openings as exits for the vitiated
air from below, ou that side of each tube directed towards the centre of the cluster
or vertical axis of the ventilator, the tubes to be seperated from each other by four
or more concentric vertical deflecting plates. The convex surfaces of these plates
being towards the centre of the ventilator, the slightest wind passing between the
tubes and the deflecting plates being sufficient to cause a strong up current in the
ventilating shaft below. A space of one half inch (or more according to the size
of the ventilator) is also left between the outside edges of these deflecting plates to
allow free passages for the wind through the centre of the ventilator from side to
side all these cross currents being powerful aids to the pumping power of the entire
ventilator.
The ventilator being made with seperate tubes makes the entire construction
very substantial in its character. Also by this arrangement the head of the
ventilator is much smaller in proportion to the size of the shaft than it is usually
made and in all cases the superficial area of the foul air exits is equal to that of the
cross section of the ventilating shaft.
Dated this 11th day of March 1895.
HENRY SAMUEL BAGSHAW.
An Improved Ventilator.
I, HENRY SAMUEL BAGSHAW of No. 14 Star Hill, Rochester, in the County of
Kent, Zinc and Plate Metal Worker, 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 :-
A plate metal roof ventilator, the head thereof being formed with a cluster of
four or more distinct vertical tubes (marked B in the drawing) these tubes may be
circular in section, or they may each be formed with one square angle (as shewn by
dotted lines at C in the drawing) each tube to have a long and narrow vertical
opening, as an exit for vitiated air, on that side of the said tube which is directed
towards the centre of the cluster, or vertical axis of the ventilator and each opening
to be fitted in the centre, with a small vertical angular deflector, reaching from
bottom to top thereof (the said openings being marked D, and the deflectors E, in
the drawing). The tubes are seperated from each other by four or more concentric
vertical deflecting plates (marked in the drawing) the convex surfaces of these
deflecting plates being towards the centre of the ventilator, the lightest air current
passing between the tubes and the deflecting plates being sufficient to cause a
LD 017

page_text: strong up draught in the ventilating shaft below. A space of one half inch, or
more, according to the size of the ventilator, is left between the beaded vertical
edges of the deflecting plates (as marked K in the drawing) to allow a free passage
for the wind through the centre of the ventilator, from side to side, these cross
currents adding greatly to the extracting power of the ventilator. The ventilator
being made with at least four seperate tubes, makes the whole construction very
substantial in its character, and at the same time lends itself to architectural
treatment in any style. Also by this arrangement of tubes the head of the
ventilator is much smaller, in proportion to the diameter of the shaft than they are
usually made, and in all cases the superficial area of the foul air exits of the tubes
in a ventilator, are equal in area to the cross section of the ventilating shaft.
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 :-
:-
Firstly. Forming the head of the ventilator of four or more distinct tubes, with
a vertical deflecting plate concentric with each tube, to seperate the said tube from
each of the other tubes.
Secondly. Having the exits for the vitiated air, directed towards the centre of
the ventilator and away from the direct action of the wind and rain.
Dated this Second day of December 1895.
H. S. BAGSHAW.