Improvements in and connected with Apparatus for Inducing Currents of Air.
Year: 1890

page_text: Date of Application, 22nd Aug., 1890
Complete Specification Left, 19th Sept., 1890-Accepted, 25th Oct., 1890
PROVISIONAL SPECIFICATION.
Improvements in and connected with Apparatus for Inducing
Currents of Air.
We JAMES HENRY PICKUP of Walmersley Road, Bury in the County of Lancaster
Engineer, JAMES BYROM of Woolfold, Bury aforesaid Contractor and EDWIN
DRANSFIELD of Bell Lane Bury aforesaid Engineer do hereby declare the nature of
this invention to be as follows:-
This invention has for its object to provide an apparatus by means of which
currents of air are produced in such manner as to very efficiently ventilate and cause
the removal of dust or particles from rooms or buildings or perform other work
wherein it is required to induce air currents.
According to this invention the apparatus consists of blades at the back of which
are affixed projections which as the blades rotate assist greatly in propelling and
directing the air currents. The blades are preferably attached to a boss in such
manner as to leave considerable air spaces between the edges of the blades. The said
blades are preferably wider at the outer than at the inner parts and are curved
backwards from the point or edge which is foremost in the direction of rotation. The
projections at the backs of the blades preferably consist of webs projecting from the
back of the blades at right angles thereto or at other suitable angle and these webs
are preferably wider at the end which is foremost in the direction of rotation of the
blades and approach nearer to the axis as they recede from the edge of the blade
foremost in the direction of rotation. In connection with this air current inducing
appliance there may be used flaps hinged at their outer sides or top and bottom edges
and opening from the centre after the manner of the doors known as "folding doors"
so that the hinged parts are not exposed to the dust to which centrally hinged doors
or flaps would be exposed. These doors or flaps open when the air currents are
induced but when the apparatus is not in operation they automatically close the
opening from the ventilator. There may also be used in connection with the
apparatus a passage or tube leading therefrom in which there is an opening or several
openings into which the air current passing along the passage or tube draws air from
rooms or apartments and so clears them from dust or foreign particles. These
openings are preferably provided internally with an inclined plate which directs
the dust laden air into the line of the air currents passing through the tube or
passage.
COMPLETE SPECIFICATION.
Improvements in and connected with Apparatus for Inducing
Currents of Air.
We JAMES HENRY PICKUP of Walmersley Road Bury in the County of Lancaster
Engineer and JAMES BYROM of Woolfold Bury aforesaid Contractor and EDWIN
DRANSFIELD of Bell Lane Bury aforesaid Engineer 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 has for its principal object to provide an apparatus by means of
which currents of air are produced in such manner as to very efficiently ventilate
and cause the removal of dust or particles from rooms or buildings or perform other
work wherein it is required to induce air currents.

page_text: We will describe the invention with reference to the accompanying drawings—
Figure 1 is a longitudinal section.
Figure 2 an end view.
Figure 3 the fan blades shewing the side opposite to that seen in Figure 2 and
Figure 4 a plan of the closing doors hereinafter described.
According to this invention the apparatus consists of blades A secured to a
shaft B which is provided with a pulley & for driving the fan from any suitable motor
and is mounted so as to turn upon pivots c carried by the framing C of the fan. The
blades A are preferably made out of a disc of metal with their inward parts in one
plane as shewn the central part of this disc being clamped between the flange on the
collar and ring 62 which collar is secured to the shaft B. At the back of each
blade A is affixed a projection D which is situated at some little distance from the
outer edges of the blades A so that there is situated on the inner side of these pro-
jections the flatter portions of the blades A and on the outer sides of the said
projections the more inclined or helically twisted portions of the blades. When the
said blades rotate these projections D assist greatly in propelling and directing the
central portions of the air currents inwards. Each blade A may have one or more of
these projections D upon its back. The blades A are formed as shewn so as to leave
considerable air spaces a a between the edges of the blades which air spaces widen
out as they recede from the centre. The said blades A are wider at the outer than at
the inner parts and are curved backwards from the point or edge which is foremost
in the direction of rotation. The projections D at the backs of the blades consist of
webs projecting from the back of the blades at, or approximately at, right angles
thereto and these webs are wider at the end which is foremost in the direction of
rotation of the blades and approach nearer to the axis as they recede from the edge of
the blade foremost in the direction of rotation. In connection with this air current
inducing appliance there may be used flaps E E hinged or pivotted at their outer
sides ee or top and bottom edges and opening from the centre e² after the manner of
the doors known as "folding doors so that the hinged or pivotted parts are not
exposed to the dust to which centrally hinged doors or flaps would be exposed. These
doors or flaps open when the air currents are induced but when the apparatus is not
in operation they automatically close the opening from the ventilator. There may
also be used in connection with the apparatus a passage or tube F as shewn in
Figure 1 leading therefrom in which there is an opening as at f (or several such
openings) into which the air current passing along the passage or tube draws air fro
rooms or apartments and so clears them from dust or foreign particles. These
openings are provided internally with an inclined plate f2 which is set some little
distance back from the rear edge of the opening as shewn and directs the dust
laden air into the line of the air currents passing through the tube or passage F.
"
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed we declare that what we
claim is.
1. An air inducing apparatus or fan with blades whose inner parts are in one plane
and have spaces between them also in the same plane and are provided each with a
projection or projections shaped and situated relatively to the flatter and more
helically twisted parts of the blades as described and illustrated.
2. The arrangement and combination of parts constituting the air inducing
apparatus as herein before described and shewn in the accompanying drawing in
combination, or not, with the doors or flaps E, and dust collecting tube For either of
them.
D
1011
2000
J. H. JOHNSON & Co.,
Agents.