Improvements in Ventilating Shafts and Caps therefor.
Year: 1893

page_text: Date of Application, 7th Feb., 1893
Complete Specification Left. 20th July, 1893-Accepted, 2nd Sept., 1893
PROVISIONAL SPECIFICATION.
Improvements in Ventilating Shafts and Caps therefor.
We, CHARLES ANCKORN of 66 and 68 Southampton Street, Camberwell,
Ironmonger, and JOSEPH MALLETT of 2 Wells Crescent Southampton Street,
Camberwell, Carpenter, do hereby declare the nature of this invention, to be as
follows:-
This invention relates to improvements in ventilating shafts for buildings, and
ventilating or terminal caps therefor, whereby down draughts are prevented and an
efficient and regulated circulation of air is maintained. The ventilating shaft is
divided by a central vertical partition into two passages and surmounted by the
cap or hood which is hinged and may be raised or lowered so as to regulate the
opening and the circulation of the air. This hood has rigid side cheeks embracing
the sides of the upper portion of the shaft and a front side which lies against the
shaft when the hood is lowered and made preferably in two portions whereof
the lower is hinged to the upper part to enable it to adapt itself to the side of the
shaft against which it is pressed by a spring when the hood is lowered. The hood
is provided with an internal division working alongside of the partition of the
shaft and forming practically a continuation thereof, so that the internal capacity
of the hood is divided like the shaft into two portions which when the hood is
In the sides of the
raised; open out beneath the front hinged side of the hood.
cap covered by the side cheeks of the hood, inlet apertures are formed guarded
on the interior by cover plates giving an upwardly inclined direction to the air
currents entering at said apertures beneath the 'side cheeks of the hood which do
not fit close against the sides of the cap which they cover. The hood is adapted
to be raised and lowered by a cord attached to the intermediate division of the
into, the apartment or other
hood and extending over a pulley within the shaft
place to be ventilated, or the hood may be raised and lowered by other mechanical
means. -
5
Dated this 7th day of February 1893.
12. 30
mo
4
C. ANCKORN,
J. MALLETT,
By A. M. & Wm. Clark,
53, Chancery Lane, London, Chartered Patent. Agents. :
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>-COMPLETE · SPECIFICATION. qua
...
:
Improvements in Ventilating Shafts and Caps therefor
We, CHARLES ANCKORN. of 66, and 68, Southampton Street, Camberwell,
Ironmonger, and JOSEPH MALLETT, of 2, Wells Crescent, Southampton Street,
Camberwell, Carpenter, 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 improvements in ventilating shafts and terminal caps
therefor, whereby, down draughts are prevented and an efficient and regulated
circulation of air is maintained.
T
Reference is to he had to the accompanying drawings, forming part of this

page_text: Specification, wherein Figure 1 is a front elevation, and Figure 2 a vertical
section, of the improved ventilating shaft and its hood. Figure 3 is a part side
elevation, and Figure 4 a plan of the shaft with the movable hood removed.
Figure 5 is a vertical section of a modification in which the whole shaft is
movable and the hood is fixed to it.
Referring to Figures 1 to 4, the ventilating shaft A is divided by a central
vertical partition a into two passages a¹ a² and is surmounted by the hood B
which is hinged at band may be raised or lowered so as to regulate the amount of
opening permitting the circulation of the air. This hood B has rigid side
cheeks C embracing the sides of the terminal portion of the shaft A and a front
side DD' which lies against the shaft A when the hood is lowered and made
preferably in two portions D D¹ whereof the lower part D¹ is hinged to the upper
part at d to enable it to adapt itself to the front side of the shaft A against which
it is pressed by a spring when the hood is lowered, as shewn in dotted lines in
Figure 2. The hood is provided with an internal division e working alongside of
the partition a of the shaft and forming practically a continuation thereof when
the hood is raised, so that the internal capacity of the hood is divided like the shaft
into two portions which, when the hood is raised, open out beneath the front
hinged side D' of the hood. In the sides of the shaft A covered by the side
cheeks C of the hood, inlet apertures F are formed guarded on the interior by
cover plates giving an upwardly inclined direction to the air currents entering at
said apertures beneath the side cheeks C of the hood which do not fit close against
the sides of the shaft which they cover. The hood is adapted to be raised and
lowered by a cord G attached to the intermediate division e of the hood and
extending over a pulley 9 within the shaft into the greenhouse, apartment, or
other place to be ventilated, or the hood may be raised and lowered by other
mechanical means. The shaft A and hood B may be made of tinplate or zinc, in
the ordinary way of making such articles and, as shewn, the shaft A is adapted to
be fixed upon the sloping roof of a greenhouse directly over an aperture made
therein, but the part A may be merely the terminal of a shaft erected in any
suitable way or built in the wall of the building and leading up from a lower
apartment to a point above the level of the roof, this shaft like the terminal
portion A being divided into two passages by a central partition in continuation of
the partition a.
The modification shewn in Figure 5 is also adapted to be fixed directly on the
roof of a greenhouse or other structure, but in this case it is fixed over an aperture
in and is carried by a hinged ventilating flap H capable of being raised in the
ordinary way of raising such flaps when the maximum of ventilation by means of
such flap is required, the purpose of the shaft A being to provide a less vigorous
amount of ventilation when the flap H is closed. The shaft A has in this case a
movable partition a which divides the shaft vertically into separate passage ways
and is hinged at its upper edge and movable, as indicated in dotted lines, so as to
vary the relative areas of the two passage ways through the shaft. The hood B is
a fixture upon the shaft A and has descending flanges on two opposite sides
embracing at a distance the front and rear of the shaft A so as to permit the
.ingress and egress of air, as indicated by the arrows, whilst excluding rain..
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. The herein described ventilating shaft A divided by a vertical partition into
two passages and provided with lateral inlet apertures in combination with the
adjustable hood B hinged thereto and provided with front and lateral covering
flaps and an intermediate division and means for raising the hood, substantially as
specified.
.'

page_text: 2. The herein described ventilating shaft A divided by an adjustable partition
in combination with a hood fixed thereto and provided with descending flanges.
affording inlet and outlet passages for air, as described.
C. ANCKORN,
J. MALLETT,
By A. M. & Wm. Clark,
53, Chancery Lane, London, Chartered Patent Agents.