Improvements in Fans or Ventilators for Mines or other Situations.
Year: 1895

page_text: Date of Application, 27th Dec., 1895
Complete Specification Left, 11th Aug., 1996-4ccepted, 12th Sept., 1896
PROVISIONAL SPECIFICATION.
Improvements in Fans or Ventilators for Mines or other Situations.
I, THOMAS MARSDEN of Alliance Colliery, Wigan in the County of Lancaster,
Manager, do hereby declare the nature of this invention to be as follows:-
This invention relates to rotary fans or ventilators for ventilating mines and
other situations and particularly to the shaping of the plates.
In carrying my invention into effect, the plan I prefer is to form the fan of a
drum provided with hollow arms radiating therefrom, each arm being arranged so
as to lie in close proximity to or touching each other. The rotary ends of these
blades are by preference sloped to an angle of 50 degrees or any other suitable
angle. The interior of the central drum is divided into curved radial chambers
communicating with the outward passages of the hollow blades. The drums may
be in communication with the interior of the mine by means of an extension tube
or pipe at one side, the other side being closed by a suitable plate. When the fan
is caused to revolve, the air is drawn into the interior of the drum and caused to
issue in a radial direction through the hollow blades or arms, and be delivered
through the openings of the ends thereof. In practice I prefer to partly close the
outer extremities of the said arms by a transverse plate or shutter so as to somewhat
decrease the area of the opening in relation to the area of the inlet opening, this
being provided mainly for the purpose of preventing any possibility of the air
finding its way back again into the blades. The fan may of course be arranged to
draw air in on both sides or on one side only.
Dated this 24th day of December 1905
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicant.
1, THOMAS MARSDEN of Alliance Colliery, Wigan in the County of Lancaster,
Manager, 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 rotary fans or ventilators for ventilating mines and
the like.
It is best described by aid of the accompanying drawings, in which,
Figure 1 is a side view, and
Figure 2 a section on line Y Z of a fan made in accordance with my invention.
In these, A is the shaft, B bearings, C hollow channelled or tubular arms,
D blades, E diaphragm between the two sides of the blade so as to form with the
shanks of the blades the hollow or channel arms aforesaid. F horizontal flange
for connecting the fan with the mine or other place to be ventilated. G flange for
connecting this flange with the walls of the fan blades. H said walls. It will be
seen that the fan blades with their walls H form a drum connected by the hollow
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arms with the journal, these arms being connected together. The rotary ends of
the blades I are sloped to an angle, preferably of about fifty degrees with the
radius. It may however be any angle between 25° and 90° without very serious
disadvantage. The interior of the central drum forming the fan arms is divided
into curved radial chambers or passages communicating with the passages on the
hollow blades and in fact form in one with them. The fan blades and arms are
cut away at J, as shown in the drawing to enable the air to more easily enter and
the entire side of the drum inside the flanges F is open for the air to more easily
enter.
The mode of action is as follows:--'
-When the fan is caused to revolve the air is
drawn into the interior of the drum from the mine through passages connected with
flanges F and is caused to issue in a radial direction through the hollow arms or
blades and is delivered through the openings at the ends thereof. In practice
may sometimes close the outer extremity of these arms a little by a transverse
plate or shutter, so as to somewhat decrease the area of the openings in relation to
the area of the inlet, and for this purpose may have an adjustable telescopic or
movable shutter whereby the area of exit can be varied to the amount of work
required from the fan, the shutter being preferably placed as shown in dotted lines
on the right-hand side of Fig. 1. The main object of this shutter however is to
prevent the air finding its way back again into the blades. The fan may of course
be arranged to draw air in on both sides or on one side only. It will thus be seen
that an exceedingly simple and cheap form of fan is obtained which requires no
casing.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, declare that what I
claim is :-
1. A rotary fan formed of hollow arms and blades open at the ends but closed
on the sides substantially as described whereby no casing is required.
2. In a fan substantially as described a series of blades sloped at the end to a
considerable angle from the circumference whereby greater freedom of exit is
achieved.
3. The general arrangement and construction of fan with hollow arms and blades
substantially as described.
Dated the 8th day of August 1896.
W. P. THOMPSON & Co.,
Of Liverpool, Manchester, Birmingham, and London, Patent Agents.