Year: 1887

page_text: Date of Application, 21st Dec., 1887
Complete Left, 16th Feb., 1888
Complete Accepted, 16th Mar., 1888
We JOHN CRIGHTON, ROBERT CRIGHTON, and GEORGE CHAPMAN PEEL all of the
Union Engineering Company Manchester in the County of Lancaster Engineers do
hereby declare the nature of this invention to be as follows:-
This invention relates principally to the class of rotary exhausting or propelling
fan known as the "Schiele" fan which was invented by Christian Schiele in 1863
and described in the Specification of his Patent No. 20 8, of that year, but it is also
applicable to other forms of rotary fans wherein the tips of the vanes or wings are
usually square or parallel to the periphery of the casing.
The objects of our invention are to facilitate the delivery of large volumes of air
and to reduce to a minimum the noise and vibration usually caused by such fans.
This we effect by making the tip or outer edge of each vane or wing of a V-shaped
form (instead of a straight line as usual) whilst the casing remains the same as before;
the extreme tip of the vanes therefore is reduced to two points (one at each side) and
the point of greatest pressure is nearer to the centre or axis than the extreme tip,
namely at the bottom of the V-shaped notch.
By these means the pressure and velocity of the air are reduced towards the extreme
tip of the vanes (instead of being increased as heretofore) thus decreasing the friction
against the casing and at the same time the delivery area of the tip of the vane is
increased, being about double what it would be if the tips were not notched. The
result of forming the tips or outer edges of the vanes with a V-shaped notch as
described is that the efficiency of the fan is increased and the delivery of the air is
greatly facilitated and the noise and vibration are very greatly diminished.
It will be evident that the same result inay be obtained by reducing the tip of the
vane in the reverse manner, that is by removing the sides and bringing the top to a
point, or by sloping it off from one side only, or by making it of a semi-oval or other
curved shape.
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GEORGE DAVIES,
4, St. Ann's Square, Manchester,
Agent for the Applicants.

page_text: An Improvement in Rotary Fans.
We JOHN CRIGHTON, ROBERT CRIGHTON and GEORGE CHAPMAN PEEL all of the
Union Engineering Company Manchester in the County of Lancaster Engineers 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 principally to the class of rotary exhausting or propelling fan
known as the "Schielo "fan, which was invented by Christian Schielo in 1863, and
described in the Specification of his patent No. 2008 of that year, but it is also
applicable to other forms of rotary fans, wherein the tips of the vanes or wings are
usually square or parallel to the periphery of the casing.
The objects of our Invention are to facilitato the delivery of large volumes of air
and to reduce to a minimum the noise and vibration usually caused by such fans.
The nature of our said Invention and the manner in which the same is to bo
performed or carried, into practical effect will be readily understood on reference to
the accompanying drawings and the following explanation thereof.
Fig. 1 is a side elevation and Fig. 2 a vertical section of a "Schielo" fan (without
the casing) constructed according to our invention, and Figs. 3. 4. 5. 6 and 7. are
plane projections showing modifications in the form of the vanes, hereinafter more
particularly referred to.
According to our Invention we make the tip, or outer edge of each vane or wing of
a V-shaped form (as shown at a Fig. 2. and in plane development at Fig. 3.) instead
of a straight line as usual (see dotted lines in the same Figs.) whilst the casing,
which is not shown on the drawing remains the same as before.
The extreme tip of the vanes therefore is reduced to two points (one at each side)
and the point of greatest pressure is nearer to the centre or axis than the extreme tip,
namely at the bottom c of the V-shaped notch.
By these means the pressure aud velocity of the air are reduced towards the extreme
tip of the vanes (instead of being increased as heretofore) thus decreasing the friction
of the column of air against the casing and at the same time the delivery area of the
tip of the vane is increased, being about double what it would be if the tips were not
notched.
The result of forming the tips or outer edges of the vanes with a V-shaped notch as
described is that the efficiency of the fan is increased and the delivery of the air is
greatly facilitated and the noise and vibration are very greatly diminished.
It will be evident that the same result may be obtained by reducing the tip of the
vane in the reverse manner that is by removing the sides and bringing the tip to a
point (as shown at Fig. 4) or by sloping it off from one side only (as shown at Fig. 5)
or by making it of a semi-oval or of a curved shape (as shown at Figs. 6 and 7).

page_text: Having now particularly described and ascertained the nature of our said Invention
and in what manner the same is to be performed or carried into practical effect we
declare that what we claim is :-
The improvement in rotary fans hereinafter described consisting in making the tips
of the vanes with a V-shaped notch (instead of a straight line parallel to the axis as
usual) or otherwise so reducing their form as to bring the point of greatest resistance
nearer to the axis than the tip of the vanes, substantially in the manner and for the
purposes herein before particularly described and illustrated by the drawings
annexed.
GEORGE DAVIES,
4, St. Ann's Square, Manchester,
Agent for the Applicants.