Improvements in Fans for Ventilating Mines, Tunnels, and the like.
Year: 1894

page_text: Date of Application, 14th Apr., 1894
Complete Specification Left, 25th Dec., 1894-Accepted, 2nd Feb., 1895
PROVISIONAL SPECIFICATION.
Improvements in Fans for Ventilating Mines, Tunnels, and the like.
1, HUGH WILLIAM WADDLE of Llanmore Works, Llanelly in the County of
Carmarthen Engineer do hereby declare the nature of this invention to be as
follows:-
The object of my invention is to provide fans in which the beneficial effects both
of flaring or trumpet mouthed periphery and of a reduction in the area of the outlet
for air at the periphery of the fan are obtained. Instead of effecting the reduction
of area by means such as are described in the Specifications of Letters Patent
No. 9180 of 13th June 1890 and No. 9046 of 12th May 1892, I effect it by means
of a mouth which at its outer periphery is trumpet or flaring shaped as described in
the Specification of Letters Patent No. 4826 of the 19th March 1889 but which is
contracted laterally between its outer periphery and the blades or where it joins the
cheeks of the fan.
.By this means I obtain a reduced speed of the air leaving the fan, consequently
reducing the resistance and effecting economy of power resulting from the flaring or
trumpet mouthed periphery and I also adapt the fan to suit the volume of air which
the mine, tunnel, or place to be ventilated will pass.
Dated this 14th day of April 1894,
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, Agents.
Improvements in Fans for Ventilating Mines, Tunnels, and the like.
I HUGH WILLIAM WADDLE of Llanmore Works, Llanelly in the County of
Carmarthen, 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 :-
The object of my invention is to provide fans in which the beneficial effects both
of a flaring or trumpet mouthed periphery, and of a reduction in the area of the
outlet for air at the periphery of the fan are obtained. Instead of effecting the
reduction of area by means such as are described in the Specifications of Letters
Patent No. 9180 of 13th June 1890 and No. 9046 of 12th May 1892, I effect it
by means of a mouth which at its outer periphery is trumpet, or flaring shaped, as
described in the Specification of Letters Patent No. 4826 of the 19th March 1889
but which is contracted laterally between its outer periphery and the blades or
where it joins the cheeks of the fan.
The accompanying drawing shews in vertical transverse section a portion of a
fan with an outlet thus formed. A are the cheeks of the fan and B is the trumpet-
shaped or flaring mouth at the periphery which is contracted laterally at bas
aforesaid. By this means I obtain a reduced speed of the air leaving the fan,
consequently reducing the resistance and effecting economy of power resulting
from the flaring or trumpet-mouthed periphery and I also adapt the fan to suit the
volume of air, which the mine, tunnel or place, to be ventilated, will pass, the
[Pain A7

page_text: contracted portion at 6 being made to suit the requirements, for the time being, of
the mine, tunnel, or other place, and when the conditions of the mine are altered,
the altered conditions can be met by replacing the flaring or trumpet-mouth by
another mouth leaving an outlet in accordance with the altered conditions of the
mine or other place.
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 fans for ventilating mines, tunnels, and the like, a flaring or trumpet-mouth
periphery the said mouth being contracted laterally between its outer periphery
and the blades or where it joins the cheeks of the fan; substantially as hereinbefore
described, and illustrated by the accompanying drawing.
Dated this 28th day of December 1894.
JOHNSONS & WILLCOX,
Agents.