Year: 1887

page_text: Date of Application, 22nd Nov., 1887
Complete Specification Left, 20th Aug., 1888-Accepted, 5th Oct., 1888
I EDWARD GRUBE of Hamburg Graskeller No. 21, in the Empire of Germany,
Engineer do hereby declare the nature of this invention to be as follows:-
This invention relates to ventilating or blower fans, and consists in an improvement
in the wind propelling surfaces.
Heretofore such fans have been made with wings radiating from a shaft said wings
lying in a plane or planes spirally about said shaft or inclined more or less to a plane
perpendicular to the axis of said shaft.
The improvement consists in forming said wings as above described but each with
an additional air propelling surface contrived preferably near the edge of the wing,
said surface projecting up substantially perpendicularly on that side of the wing which
lies in the direction in which the air etc. is to be moved, and also in a plane tangential,
or substantially so, to a cylinder whose axis is the axis of the shaft of the fan and in
such part of the tangent as extends towards the direction in which the fan rotates.
Dated this 22nd day of November 1887.

page_text: I EDWARD GRUBE of Hamburg, Graskeller 21, in the Empire of Germany
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 relates to ventilating or blower fans and consists in an improvement
in the wind propelling surfaces.
Heretofore such fans have been made with wings radiating from a shaft said wings
lying in a plane or planes spirally about said shaft or inclined more or less to a plane
perpendicular to the axis of said shaft. I am also aware that it has been proposed
with the object of preventing centrifugal spreading of the air, to surround such fans
with a shell revolving with them or to form the blades with peripheral cylindrical
hoods.
The improvement consists in forming said wings with an additional surface in a
plane tangential or substantially so to a cylinder whose axis is the axis of the shaft of
the fan and in such part of the tangent as extends towards the direction in which the
fan rotates.
Referring to the accompanying drawings
Fig. is an elevation, Fig. 2 a plan, and. Fig. 3 a cross section in line xx
Fig. 1. showing the improved fan, A being the central shaft thereof the inclined
spiral wings and the outer wind surface thereof formed as described.
The arrows show the direction of movement of the air in relation to the fan.
To connect the edges of the outer wind surfaces with the circular outlet o they
may be continued over in a plane perpendicular to the axis of rotation of the fan to
complete and close the interval between the tangent surfaces i¹ and the said circle, o.
A fan so constructed may be said to be composed of a series of scoops or shovels
which not only drive the air forward by their spiral or inclined faces i but also operate
to take in air to the extreme circle of the outer edges of the tangential surfaces i¹ and
carry such air towards the centre and deliver it through the circular outlet o.
surfaces may be true tangential planes as described or they may be straight or curved
surfaces approaching approximately to a tangential nature.
The
That is to say so that their front edges (in the direction of rotation) be at a further
distance from the centre than their rear edges so that the air is driven inward thereby,
during revolution of the fan.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is
In a fan or blower the combination with the inclined or screw surfaces i of the
tangential or approximately tangential plane or curved surfaces ¹ substantially as
set forth.
Dated this 20th day of
Anot IXYY
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C.,
Agents to Applicant.

page_text: I EDWARD GRUBE of Hamburg Graskeller No. 21, in the Empire of Germany,
Engineer do hereby declare the nature of this invention to be as follows:-
This invention relates to ventilating or blower fans, and consists in an improvement
in the wind propelling surfaces.
Heretofore such fans have been made with wings radiating from a shaft said wings
lying in a plane or planes spirally about said shaft or inclined more or less to a plane
perpendicular to the axis of said shaft.
The improvement consists in forming said wings as above described but each with
an additional air propelling surface contrived preferably near the edge of the wing,
said surface projecting up substantially perpendicularly on that side of the wing which
lies in the direction in which the air etc. is to be moved, and also in a plane tangential,
or substantially so, to a cylinder whose axis is the axis of the shaft of the fan and in
ich part of the tangent as extends towards the direction in which the fan rotates.
Dated this 22nd day of November 1887.
HERBERT & Co.,
Agents to Applicant.

page_text: improvements in Ventilating Fans.
I EDWARD GRUBE of Hamburg, Graskeller 21, in the Empire of Germany
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 relates to ventilating or blower fans and consists in an improvement
in the wind propelling surfaces.
Heretofore such fans have been made with wings radiating from a shaft said wings
lying in a plane or planes spirally about said shaft or inclined more or less to a plane
perpendicular to the axis of said shaft.
The improvement consists in forming said wings as above described but with an
additional surface contrived preferably at or near the edge of the wing said surface
projecting up substantially perpendicularly on that side of the wing which lies in the
direction in which the air etc. is to be moved and also in a plane tangential or
substantially so to a cylinder whose axis is the axis of the shaft of the fan and in such
part of the tangent as extends towards the direction in which the fan rotates.
Referring to the accompanying drawings
Fig. 1 is an elevation, Fig. 2 a plan, and Fig. 3 a cross section in line xx
Fig. 1. showing the improved fan, A being the central shaft thereof i the inclined
spiral wings and the outer wind surface thereof formed as described.
The arrows show the direction of movement of the air in relation to the fan.
To connect the edges of the outer wind surfaces with the circular outlet o they
may be continued over in a plane perpendicular to the axis of rotation of the fan to
complete and close the interval between the tangent surfaces and the said circle, o.
A fan so constructed may be said to be composed of a series of scoops or shovels
which not only drive the air forward by their spiral or inclined faces but also operate
to take in air to the extreme circle of the outer edges of the tangential surfaces ¿¹ and
carry such air towards the centre and deliver it through the circular outlet o.
surfaces may be true tangential planes as described or they may be straight or curved
surfaces approaching approximately to a tangential nature.
The
That is to say so that their front edges (in the direction of rotation) be at a further
distance from the centre than their rear edges so that the air is driven inward thereby,
during revolution of the fan.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
In a fan or blower the combination with the inclined or screw surfaces i of the
tangential or approximately tangential plane or curved surfaces ¹ substantially as
set forth.