Improvement in Ventilating Fans.
Year: 1892

page_text: Date of Application, 25th Feb., 1892
Complete Specification Left, 23rd Sept., 1892-Accepted. 25th Feb. 1893
PROVISIONAL SPECIFICATION.
Improvement in Ventilating Fans.
RICHARD TOOTALL of No. 129 Beatrice Terrace Darwen in the County of
Lancaster do hereby declare the nature of this invention to be as follows:-
The blades or vanes of my fan are made and fixed on the fan wheel or boss in
such a manner, that the ends of vane or blade dip lower, than they are at the boss,
and thus prevent any air or other fluid, from being lost through centrifugal force.
This is also assisted by the end of blade being bent up about a sixth part of the
diameter of fan almost at right angles with the body of blade, and the said end of
blade is made of such a shape that it draws the air towards the centre, or prevents
it being dispersed by the centrifugal force. The back edge of blade is curved to
throw the air in a direction parallel with the shaft or axle of fan. The front or
entering edge of blade is set in a line passing through the centre of a circle.
Dated this 24th day of February 1892,
RICHARD TOOTALL.
COMPLETE SPECIFICATION.
Improvement in Ventilating Fans.
1 RICHARD TOOTALL of 129 Beatrice Terrace Darwen in the County of
Lancaster Millwright 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 novelty and utility of this invention is to reduce the centrifugal force
that retards the free action of the fans and to facilitate the fitting by reducing the
number of parts and in order to accomplish the objects I proceed as follows:-
1st. I make the blades of sheet metal of trapezium form but the points or corners
of broad or base end of the plate I make round instead of angular, to prevent
centrifugal action.
2nd. The base end of the said plate is bent in a right angular form towards the
inner surface of the plates in a curvilinery and triangular form sufficient to cover or
form the periphery of the fan and prevent centrifugal force.
3rd. The front surface or base, of the blades, is plane, or oblique, varing
according to size, and position in which the fans are placed, and for the purpose,
they are to be use, in order, to assist the admittance of the air with the least
friction.
4th. The back surface, at hub end, is bent inward curvilinery, to form the back
edge.
5th. In the plane surface of the blade at the narrow or hub end are holes to
secure or connect the blade to the hub or shaft by bolts or otherwise the number of
holes varing according to the size of blade.
In order to elucidate more fully the following is a description of the drawings.
Fig. 1. represents a plan of the plate from which the blade is made, and the
dotted lines means that the plate is bent at those points to form the periphery "B."
and back edge "C." and plane surface "A."
"A." represents a plane surface and may be termed the base of the blade.
"B." represents the angular surface of the periphery.
"C." represents the angular surface to form back edge and is bent curvilinery
inwardly at hub end as shown in Fig. "6."
[Price Q11

page_text: "D."
represents the angular surface forming body of blade, is curvilinery inclined
from "A." to "C." and oblique from "F." to hub end.
The curved parts "E." F. and "C." prevents separate pieces having to be
connected to form the periphery and back edge of blade. The curve at "E."
brings the entering edge at periphery below the radial line of hub or shaft and the
curve at "F." the leaving edge above the radial line.
"H." are holes at hub end to connect or secure blade to hub or shaft the number
and size of holes varying according to size of fans.
Fig. 2. is an outside view of periphery "B." as described in paragraph "2"
showing the outside of the curves "E." and "F." and surface body "D."
Fig. 3. is a view of front or entering edge of blade showing edge of curve
and periphery "B."
"E."
Fig. 4. is a view of the edge at hub end of blade showing plane surface "A."
curvilinery inclined body "D." angular surface "C."
Fig. 5. outside view of back part of blade showing surface "A." obliqued, and
surface D obliqued from "C." to "F." and the curve "F" from periphery "B."
to angular surface "C."
Fig. 6 is a view of the blade showing part of inside surface "A." at hub end also
inside surface of periphery "B." also of curve "E." and "F." and the outside
surface of the angular surface "C." view from the back.
Fig. 7. is a plan of hub to which the blade is connected at "H."
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 :-
The making of fan blades for ventilating purposes of sheet metal of a trapezium
form bent curvilinery triangular and oblique for the purpose and advantages as
herein before described but more particular in paragraphs 1. 2. 3. and 4.
Date this 22nd day of September 1892.
RICHARD TOUTALL.