An Improved Ventilating or Air-exhausting Apparatus.
Year: 1897

page_text: Date of Application, 10th Mar., 1897
Complete Specification Left, 5th Jan., 1898-Accepted, 19th Feb., 1898
PROVISIONAL SPECIFICATION.
An Improved Ventilating or Air-exhausting Apparatus.
I, ARVID HENSTROM, of Ashleigh, Upper Beulah Hill, Upper Norwood, Engineer,
do hereby declare the nature of this invention to be as follows:-
My invention relates to an improved ventilating or air exhausting apparatus.
The apparatus consists essentially of two inverted funnels one of which is placed
on the end of the flue or up-take, and the other is placed concentrically above the
same, and may be provided with a further chimney.
The essential feature of the invention, however, resides in the arrangement
of guiding plates or wings which are placed concentrically around the flue or
up-take, and by means of which the air passing into the apparatus from the outside
has imparted to it a rotary or cyclonic motion which causes an outer up-draught
and consequent suction through the flue of which the apparatus is attached. The
blades have a twisted shape caused by the difference in direction of their upper
and lower edges, the upper edge having a direction from the periphery of the
apparatus towards the periphery of the lower edge of the outlet, to which it
approaches at a tangent, or ends in the direction of a point between the periphery
and the centre of the outlet; the lower edge of the blade having a direction from
the periphery of the apparatus towards the centre of the up-take or flue or towards
a point between the centre and the periphery, but always nearer to the centre
than to the point towards which the upper edge points.
The inner side of each blade the end of which connects the upper and lower
edge of the blade closes to the flue with its lower end, and to the outlet with its
upper end, receiving a spiral form like that of the thread around the core of a screw.
The outer side of the blades has a more or less vertical position.
Owing to this formation of the guide blades the air rushing in receives a rotary
cyclonic motion and causes partial vacuum above the flue and consequently a strong
draught in the same, so that the chimney or the like operates effectually.
100%
An Improved Ventilating or Air-exhausting Apparatus.
I, ARVID HENSTRÖM, of Ashleigh, Upper Beulah Hill, Upper Norwood, London,
Engineer, do hereby declare the nature of this invention, and in what manner the
[Price 8d.]

page_text: same is to be performed, to be particularly described and ascertained in and by the
following statement:-
My invention relates to an improved ventilating or air-exhausting apparatus,
of the class consisting of two inverted funnels, one of which is placed on the end
of the flue or up-take, and the other is placed concentrically above the same, (and
may be provided with a further chimney), and guiding blades or wings placed
between the said funnels.
The essential feature of my invention, resides in the arrangement of the guiding
plates or wings which are placed concentrically around the flue or up-take, and
by means of which the air passing into the apparatus from the outside receives a
rotatory or cyclonic motion which causes an up-draught and consequently suction
through the flue to which the apparatus is attached. The blades have a twisted
shape caused by difference in direction of their upper and lower edges, the upper
edge having a direction from the periphery of the apparatus towards the periphery
of the outlet, to which it approaches so that it ends in the direction of a point
between the periphery and the centre of the outlet-the lower edge of the blade
having a direction from the periphery of the apparatus towards the centre of the
up-take or flue or towards a point between the centre and the periphery, but always
nearer to the centre than to the point towards which the upper edge points.
In the accompanying drawing, Figure 1 shows a vertical section of the
apparatus. For the sake of clearness only one blade is shown in this figure.
Figura plan view or shapparati, with the upper chimney red funnel
taken away.
"
Referring to the drawing, a represents the lower funnel attached to the flue d
6 is the upper funnel and e the chimney of the same, ce are the guiding-plates
or wings which are placed concentrically around the flue or up-take. As shewn
in Fig. 2 the upper edge ¹ runs from the periphery of the apparatus towards the
lower edge of the outlet to which it approaches so that it ends in the direction
of a point between the periphery and the centre of the outlet, while the lower edge c³
runs from the periphery of the apparatus in a direction towards the centre of the
uptake of the flue.
Owing to this formation of the guide-blades the air rushing in receives a rotatory
cyclonic motion, and causes partial vacuum above the flue and consequently a strong
draught in the same, so that the chimney or the like operates effectually.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
In a ventilating or air-exhausting apparatus of the class described, guiding
plates or wings in which the upper edges have a direction from the periphery of
the apparatus towards the lower edge of the outlet approaching and ending at the
same in the direction of a point between the periphery and the centre of the outlet,
the lower edges of said guiding blades or wings running from the periphery of the
apparatus to the uptake or flue in a direction of the centre of the same or towards a
point between the centre and the periphery, but always nearer to the centre than
the upper edge points, substantially as and for the purpose set forth.
30.
W. P. THOMPSON & Co.,
Of London, Liverpool, Manchester and Birmingham,
Patent Agents for the Applicant.