Improvements in Ventilators.
Year: 1894

page_text: Date of Application, 28th July, 1894
Complete Specification Left, 17th Apr., 1895-Accepted, 18th May, 1895
Improvements in Ventilators.
We, EDWARD JOHN How and HENRY KING, both of 100 Queen Victoria
Street, in the County of Middlesex, Merchants, do bereby declare the nature of
this invention to be as follows:-
This invention relates to ventilators and comprises the improvements hereinafter
described.
Our improved ventilator is made in two independent parts which are built into
an opening in the wall of the room to be ventilated and are placed one at the
internal face and the other at the external face of the wall. By constructing our
improved ventilator in two independent parts we are enabled to apply it with
equal facility to walls of different thicknesses.
The outer part of the ventilator comprises a frame or box having an external
wall the upper half or part of which is formed by a grid of any suitable pattern
and the lower half or part by a plate which is inclined downwards and outwards.
The lower edge of said inclined plate projects beyond the face of the wall, and
in the bottom of the box or frame is provided an opening extending in depth
from the said lower edge to the face of the wall.
Behind the sloping wall and the grid is a baffle plate inclined inwards and
upwards from the bottom of the box to near the top. The upper end of said
baffle plate is preferably curved outwards. The object of said baffle plate is to
check any inward rush of air and direct the same either downwards through the
opening above mentioned or upwards and outwards through the grid, according
to the direction of the current. The inward rush of air from either above or
below, after impinging on the baffle plate, creates in escaping a suction which
draws out the inner or vitiated air. This baffle plate also prevents rain being
blown into the room.
The inner part of the ventilator comprises a box or frame having a grid of
any suitable pattern flush or nearly flush with the inner face of the wall.
Suspended within said box at a short distance from the grid and one above the
other are two or more flaps made of silk or other fabric or material. Said flaps
are secured along their upper edges and hang vertically. The fabric forming
each flap is stretched across a suitable light frame which is preferably weighted
at the lower edge. Between each flap and the grid beforementioned is provided
a frame forming a stop to prevent the flap being blown close against the grid.
Said stops are inclined downwards and inwards.
The air passing outward through the ventilator passes under the flaps and over
the baffle plate and out through the external grid. Should a sudden gust of wind
attempt to pass inward the flaps will be blown against the inclined frame stops thus
closing the aperture through the ventilator.
Dated this 28th day of July 1894.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicants.

page_text: 744
We, EDWARD JOHN How. and HENRY KING, both of 100 Queen Victoria:
Street, in the County of Middlesex, Merchants, 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 ventilators and comprises the improvements hereinafter
described:
Our improved ventilator. is made in two independent parts which are built into
an opening in the wall of the room to be ventilated. and are placed one at the
internal face and the other at the external face of the wall. By constructing our
improved ventilator in two independent parts we are enabled to apply it with equal
facility to walls of different thicknesses.
Referring to the accompanying drawings,
Figure is a vertical section of a wall having our improved ventilator, also
shown in section, fixed therein.
Figure 2 is a vertical section of the inner part of the ventilator drawn to a
larger scale, and.
Figure 3 is a front elevation of said inner part, a portion of the grid being
removed.
The outer part of the ventilator comprises a frame or box A having an external.
wall, the upper half or part of which is formed by a grid B of any suitable pattern
and 'the lower half or part by a plate C which is inclined downwards and outwards.
The lower.edge of said inclined plate projects beyond the face of the wall D; and
an opening E, extending, horizontally from the said lower edge to the face of the
wall, is provided in the bottom of the box.
Behind. the sloping plate C and the grid B is a baffle plate F inclined inwards
and:upwards from the bottom of the box to near the top thereof. The upper end
of said baffle plate is preferably curved outwards as shown. The object of said
baffle plate is to check any inward rush of air and to direct the same downwards
through the opening E or upwards and outwards through the grid B, according to
the direction of the current. The inward rush of air from either above or below,
after impinging on the baffle plate, creates, in escaping, a suction which draws out
the vitiated air from.. the. room. The baffle plate F also serves to prevent the
blowing of rain into the room. We preferably make the inclination of the plate C
less than that of the baffle plate F so that the opening between the said plates is
shallower at the top than at the bottom; this construction assists the above
described action of these parts.
The inner part of the ventilator comprises a box or frame G having a grid 'H'of
any.suitable pattern, the said grid being flush or nearly flush with the inner face of
the wall. Suspended within said box at a short distance from the grid and' one
above the other are two flaps J made of silk or other flexible fabric or material.
In some instances we use one flap only, in others we use more than two.
The said
flaps are suspended by their upper edges from rods Jthat rest in sockets Jerom
which they can be lifted and removed when desired. The fabric forming each flap
may be stretched across a suitable light frame or it may be simply weighted by a
rod or otherwise at the lower edge. Between each flap and the grid Eis-provided
a frame K forming a stop to prevent the flap being blown close against the grid H.
The said stops are inclined downwards, and inwards with respect.to the room and
the part L between and joining the stops is inclined downwards and outwards to
ensure a free passage for the air beneath the upper flap J.
The air leaving the room through the ventilator passes under the flaps J and
over the baffle plate F and out through the external grid B and opening E.

page_text: Should a sudden gust of wind attempt to pass inward, the flaps will be blown
against the inclined frames or stops K and will close the apertures therein, thus
checking the back draught through the ventilator.
The mode of suspending the flaps in combination with the frame-like stops
therefor, ensures a quick action of the flaps and prevents their jamming or sticking
against the grid.
Either the outer or the inner part of the ventilator may be used independently
of the other. For example the inner part of the ventilator may be conveniently
used alone in a chimney breast.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is:-
1. A ventilator made in two parts, substantially as described.
2. The combination of the baffle plate F and inclined plate C with the
opening E between them, and the grid B, substantially as, and for the purposes,
specified.
3. In the said ventilator, the flaps J suspended from sockets J³, substantially as
described, and for the purpose specified.
4. The suspended flaps J in combination with the inclined frame-like stops K
and with or without the inclined part L between the stops, substantially as, and for
the purposes, specified.
Dated this 17th day of April 1895.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicants.