Improvements in the Construction of Fans or Apparatus for Ventilating Mines, Tunnels, and the like.
Year: 1889

page_text: Date of Application, 19th Mar., 1889
Complete Specification Left, 2nd May, 1889-Accepted, 15th June, 1889
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Fans or Apparatus for
Ventilating Mines, Tunnels, and the like.
I, HUGH WILLIAM WADDLE of Llanmore Works, Llanelly in the County of Caer-
marthen, Engineer, do hereby declare the nature of this Invention to be as follows:-
My Invention relates to the construction of ventilating fans or apparatus for ventilating
mines, tunnels and the like and it has for its object facilitating the escape of the air from
the apertures or openings through which it is discharged from the said fans or venti-
lating apparatus. With this object I give the said apertures or openings a flaring or
trumpet mouthed form by the application of suitably curved or inclined plates or
extensions. In carrying out my Invention I add on to my usual inake of fan known as
the Waddle fan for example curved sheets or plates to each side of the fan at the
edges of the opening through which the air is discharged thus forming an enlarging
exit for the air. The said sheets or plates are of an annular form corresponding to
the annular discharge opening with which these fans are provided there being one;
annular curved plate on each side of the opening so as to form a passage of flaring or
trumpet mouthed form in transverse section.
By these means a greater quantity of air is enabled to be forced through the fan or
ventilating apparatus than is possible with discharge apertures of the ordinary form.
Dated this 19th day of March 1889.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, Agents.
COMPLETE SPECIFICATION.
Improvements in the Construction of Fans or Apparatus for
Ventilating Mines, Tunnels, and the like.
HUGH WILLIAM WADDLE of Llanmore Works Llanelly in the County of
Caermarthen 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 :-
My Invention relates to the construction of ventilating fans or apparatus for
ventilating mines tunnels and the like and it has for its object facilitating the escape
of the air from the apertures or openings through which it is discharged from the said
fans or ventilating apparatus. With this object I give the said apertures or openings a
flaring or trumpet mouthed form by the application of suitably curved or inclined
plates or extensions whereby the fan is enabled to draw off and discharge the air or
gases with great power as hereinafter described.
And in order that my said Invention may be fully understood I shall now
proceed more particularly to describe the same and for that purpose shall refer to the
several figures on the annexed sheet of drawings the same letters of reference indicating
corresponding parts in all the figures :-
Figure 1 of the accompanying drawing represents a Waddle fan for example con-
structed according to my present invention a portion of the sides being shown broken
away in order to show the improved arrangement of the discharge aperture.
Figure 2 illustrates this aperture in transverse section.
The fan may be of any other ordinary or suitable construction as regards the con-
struction of the blades and other parts and my present invention consists in attaching
or adding curved sheets or plates A to each side B of the fan at the edges of the
opening through which the air is discharged thus forming an enlarging exit for the
The said wheels or plates A are of an annular form corresponding to the annular
air.

page_text: discharge opening with which these fans are provided there being one annular curved
plate on each side of the opening so as to form a passage of flaring or trumpet
mouthed form in transverse section as shown more clearly in Figure 2. By these
means a greater quantity of air is enabled to be forced through the fan or ventilating
apparatus than is possible with discharged apertures of the ordinary form.
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.
Providing the discharge opening of Waddle or other ventilating fans or apparatus
with curved or inclined plates or extensions so as to give the said opening a trumpet
shaped or flaring form in transverse section substantially as and for the purpose
herein before described with reference to the accompanying drawings.
Dated this 2nd day of May 1889.
HUGH WM. WADDLE.