Improvements in Ventilators.
Year: 1890

page_text: Date of Application, 7th Oct., 1890
Complete Specification Left, 7th July, 1891-Accepted, 29th Aug., 1891
PROVISIONAL SPECIFICATION.
Improvements in Ventilators.
I, JOHN EDWARD SEARS, of 16 New Bridge Street, Blackfriars, London, E.C.
Architect, do hereby declare the nature of this invention to be as follows :-
:-
This invention relates to that class of ventilators by which a suction of the
vitiated air is obtained by the movement of the outside atmospheric air past or over
the exit of the vitiated air.
The salient features of this invention consist (a) in arranging the inlet for the
atmospheric air on the trumpet mouth principle so that the inlet air becomes
concentrated when passing the exit for the vitiated air which concentration causes
the current of air to pass at an increased rate, setting up an increased suction:
(b) and if desirous of drawing out vitiated air from two or more different sources,
so arranging the ventilator as to act accordingly.
One form of the ventilator consists of a central shaft for the vitiated air from
one source: the top of this shaft branches into triangular shaped chambers with
concave outsides two of the outsides being preferably longer than the other side
having an exit for the vitiated air at each corner; these triangular chambers are
preferred to be four in number and placed square round a central chamber so that
the longer outsides form four square placed outward curves, the inner corners being
set a certain distance apart: held between the inner corners projecting outwards
and slightly into the central chamber is a plate the outside being rounded or curved
and the inside having a double incline end. By the arrangement described there
is a direct passage for air through from one side out of the other side the curves of
the plates or sides so deflecting the current of air over the exits that no down
draught is possible. The exits on the outside corners have a curved plate in front
of them, the rounded part standing outwards.
Where the ventilator is desired to draw vitiated air from two or more different
sources one source is brought up a central shaft having the top fitted with
preferably four plates formed at double angle curves with the two ends slightly
bent inwardly these plates are arranged to leave a division between each which is
the exit for the vitiated air. Placed opposite each exit of these plates is an
clongated triangular arrangement of plates one plate being outwardly convex
another concave, and the third straight with a rounded end, each end of the convex
plate is set a certain distance from the two ends of the other plates which form the
exits for the vitiated air. Four such arrangements of plates are proposed to be
used which are carried upon the top of branch pipes leading to the main shaft for
the withdrawal of vitiated air from one source while the vitiated air from the other
source is extracted from the central shaft. A deflecting plate placed at an angle
to the straight plate of these triangular sets may be used between each set to assist
the trumpet mouth principle.
These triangular sets of plates deflect the air past the exits of the central curved
angle plates and these in their turn deflect the air past the exits of the triangular
sets.
The above described means is capable of numerous modifications without
leparting from the spirit of the invention as for single acting ventilators part of
the above described arrangements need only be used.
Dated this 7th day of October 1890.
FREDERIC PRINCE,
Agent for Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Ventilators.
I, JOHN EDWARD SEARS, of 10 New Bridge Street, Blackfriars London, S.E.
Architect, 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 that class of ventilators by which a suction or exhaust
of the vitiated air is obtained by the movement of the outside atmospheric air
past or over the exit of the vitiated air.
The salient features of this invention consist (a) in arranging the inlet for the
atmospheric air on the trumpet mouth principle so that the inlet air becomes
concentrated when passing the exit for the vitiated air which concentration
increases the force of the current of air at the point of exhaustion: () and if
desirous of drawing out vitiated air from two or more different sources, 50
arranging the ventilator as to act accordingly. One form of the ventilator consists
of a central shaft for the vitiated air from one source: the top of this shaft
branches into triangular shaped chambers with concave outsides two of the outsides
being preferably longer than the other side having an exit for the vitiated air at
each corner; these triangular chambers are preferred to be four in number and
placed square round a central chamber so that the longer outsides form four square
placed outward curves, the inner corners being set a certain distance apart: held
between the inner comers projecting outwards and slightly into the central
chamber is a plate the outside being rounded or curved and the inside having a
double incline end. By the arrangement described there is a direct passage for
air through from one side out of the other side the curves of the plates or suites so
deflecting the current of air over the exits that no down draught is possible. The
exits on the outside corners have a curved plate in front of them the rounded part
standing outwards.
Where the ventilator is desired to draw vitiated air from one or more different
sources, one source is brought up a central shaft having the top fitted with preferably
four plates formed at double angle curves these plates are arranged to leave a
division between each which is the exit for the vitiated air. Placed opposite each
exit of these plates is an elongated triangular arrangement of plates one plate
being outwardly convex another concave, and the third straight with a rounded
end, each end of the concave plate is set a certain distance from the two ends of
the other plates which form the exits for the vitiated air.
Four such arrangements of plates are proposed to be used which may be carried
upon the top of branch pipes leading to the main shaft for the withdrawal of
vitiated air from one source while the vitiated air from the other source is
extracted from the central shaft. A deflecting plate placed at an angle to the
straight plate of these triangular sets may be used between each set to assist the
trumpet mouth principle. These triangular sets of plates deflect the air past
the exits of the central curved angle plates and these in their turn deflect the air
past the exits of the triangular sets.
To enable my invention to be properly understood I will proceed to fully
describe the same with aid of the accompanying drawings.
Figure 1, is a vertical central section of a ventilating cowl according to this
invention; and
Figure 2, a horizontal section on line ay Figure 1.
Figure 3, an elevation of a slightly modified form of ventilating cowl, and
Figure 4a section of same on line ¹ y'..
Figures 5 and 6 are further slight modifications shown in horizontal or plan
sections.
CD & on line
2

page_text: A is the up shaft of ventilator terminating in a tapered part B into which the
vacuum producing parts communicate for drawing up the vitiated air. The parts C
show an arrangement of plates each part having two exits or mouths D for the
exit of vitiated air; these parts C may be closed at top but are open at bottom
into part B. E, is a central exhaust part formed of a number of curved plates
arranged to leave four mouths or exits for the vitiated air; the part E, may be
either closed at top or open but is open at bottom into part 13: wind blowing into
the ventilator at G (Figure 2) is deflected in the direction of the arrows, causing a
vacuum while passing the outlets D and thereby sucking out vitiated air from
same. By the arrangement and shape of the outside of the plates forming the
parts C, the inblowing wind becomes concentrated and so produces an increased
speed in the current passing past the mouths D, F, which sets up an increased
exhaust. Figures 3 and 4 is a similar arrangement to Figures 1 and 2 with the
exception of a slight variation in the form of the parts C, three of which are used
in place of four as in previous figures. Figure shows an arrangement of two
parts C. Figure 6 shows the same plan adopted to a trough or passage shaped
ventilator. In this arrangement the parts C are slightly different in construction
and shape to the paris C shown in the other views. The bottom of parts C' and
part E communicating with the passage for the outlet of vitiated air. It is not
necessary in the carrying out of this invention that the form of the part C shewn
in the drawing should be strictly adhered to, one variation may be as shown by
dotted lines in Figures 2, 4, and 5.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
1st. In a ventilator or ventilating cowl, the arrangement of the parts C in
combination with the part E, substantially as hereinbefore described and illustrated
by the accompanying drawings.
2nd. In a ventilator or ventilating cowl the combination with a central exhaust
part E of parts C having one or more outlets D, as hereinbefore described and
illustrated by the accompanying drawings.
3rd. In a trough or passage ventilator the shape and arrangements of parts C1
in combination with part E, as herein before described and illustrated by the
accompanying drawings.
4th. The combination and arrangement of the different parts constituting
ventilators or ventilating cowls, substantially as hereinbefore described and
illustrated by the accompanying drawings.
Dated this 7th day of July 1891.
FREDERIC PRINCE,
1, Quality Court, Chancery Lane, London, W.C.