Improvements in Fans for Ventilating Mines, Tunnels, or for analogous purposes.
Year: 1890

page_text: Date of Application, 13th June, 1890
Complete Specification Left, 13th Jan., 1891-Accepted, 14th Feb., 1891
FRUVIDIONAL DEVITTALION.
Improvements in Fans for Ventilating Mines, Tunnels, or for
analogous purposes.
I, 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 overcome the objection arising in the use of
open running fans from the outlet of the fan being in excess of the available inlet
that is of the volume of air which the place to be exhausted will pass. According
to my invention I provide the fan with a band or partial covering which contracts
the available outlet and so utilizes a larger percentage of the power required to work
the fan.
This band or partial covering preferably takes the form of a strip placed round the
outer periphery of the blades of the fan. When the fan is to be run to its full
capacity this band or partial covering is removed.
Dated this 13th day of June 1890.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, Agents.
COMPLETE SPECIFICATION.
Improvements in Fans for Ventilating Mines, Tunnels, or for
analogous purposes.
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 overcome the objection (namely loss of power)
arising in the use of open running fans when the outlet of the fan is in excess of the
available inlet, that is of the volume of air which the mine or other place to be
exhausted will pass. According to my invention I provide the fan with a band
or partial covering which contracts the available outlet and so utilizes a larger
percentage of the power required to drive the fan. This band or partial covering
preferably takes the form of a strip placed round the outer periphery of the blades
of the fan by preference at the middle as shewn. When the fan is to be run to its
full capacity this band or partial covering is removed.
.
The accompanying drawing shews in Figure 1 in side view and in Figure 2 in
edge view one quarter of a fan provided with a band or partial covering G, the
remainder of the fan being similarly provided. The said band or partial covering G
may be secured in place by any suitable means. For instance some, or all, of the
blades B B may carry an angle piece rivetted, or otherwise secured, thereto
the band or partial covering being also rivetted or otherwise secured to the said
angle pieces a When the fan is to be run at its full capacity, as the extent of
the mine or the like increases, the said band, or partial covering, G, can be
removed

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
Providing the outlet of a fan with a band, or partial covering, for the outlet ;
substantially as, and for the purpose, hereinbefore described.
Dated this 3rd day of January 1891.
HUGH WILLIAM WADDLE.
HUGH WILLIAM WADDLE.