Improvements in Fans.
Year: 1893

page_text: Date of Application, 9th June, 1893
Complete Specification Left, 9th Mar., 1894-Accepted, 14th Apr., 1894
Improvements in Fans.
I, HARRY BOLTON DAGLISH, of St. Helen's Engine and Boiler Works,
St. Helen's, in the County of Lancaster, Engineer, do hereby declare the nature of
this invention to be as follows:-
This invention has reference to fans for moving air or other gases, that is for
ventilating, exhausting, or withdrawing air or other gases, or for blowing and other
purposes; and it has mainly for its object to provide improvements by which noise
and vibration existing in or produced by fans as ordinarily constructed is diminished,
and their efficiency increased.
Under this invention, the blades are so arranged or formed that the air being
discharged by the blades as they pass the shutter, is not cut off thereby all at
once but is cut off by degrees or more or less gradually. In one form or
arrangement I make the blades or tips of the blades inclined or of angular
arrangement; while in another they may be formed with a double incline, in the
form of a V, or in multiple V or W form, or serrated or corrugated, or in the
form of a curve or curves concavely or convexly arranged; or they may be
equivalently or similarly arranged.
Dated this 8th day of June 1893.
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,”
15, Water Street, Liverpool, Applicant's Patent Agents.
Improvements in Fans.
I, HARRY BOLTON DAGLISH, of St. Helen's Engine and Boiler Works,
St. Helen's, in the County of Lancaster, 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 :-
This invention has reference to fans for moving air or other gases, that is for
ventilating, exhausting, or withdrawing air or other gases, or for blowing and other
purposes; and it has mainly for its object to provide improvements by which noise
and vibration existing in or produced by fans as ordinarily constructed is diminished
and their efficiency increased.
Under this invention, the blades or vanes are so arranged or formed that the
air being discharged by the blades as they pass the ordinary shutter, is not cut off
thereby all at once but is cut off by degrees or more or less gradually. In
one form or arrangement I make the blades or tips of the blades inclined or of
angular arrangement; while in another they may be formed with a double incline,
in the form of a V, or in multiple V or W form, or serrated or corrugated, or
in the form of a curve or curves concavely or convexly arranged; or they may
be equivalently or similarly arranged.
The drawings hereto annexed shew one simple construction of fan according to
my invention.
In the drawings,

page_text: Figure 2 is a view shewing the means and rotating portion in transverse
section; and
Figure 3 is a view shewing one of the blades in transverse section, and the edge
of the shutter.
Referring to these figures, a is the casing of the fan, bis the shutter, e are the
vanes, and d is the outlet.
The vanes c consist of V shaped plates, the meeting edges of such parts forming
an obtuse angle; whilst the shutter 6 or the edge thereof, is of the ordinary straight
or rectangular kind lying parallel with the axis of the fan. The outer edges of the
plates of the vanes are disposed and arranged in front of the meeting edges or vees
as regards their relation to the direction of motion of the vanes, so that in
action, said outer edges reach the straight edge of the shutter b first, and the vee
edges last.
In the example of fan shewn, the vanes are connected and supported from the
boss e by the arms e', to which the meeting edges of the plates of the vanes are
rivetted or fastened; whilst the different vanes are connected together circularly
by rings f.
The action of the fan is that the discharge of air into the outlet d by each of the
vanes is so effected that no sudden cessation of action (nor commencement of
action) of such vanes takes place in passing over the shutter, but accordingly as
the vanes, either as a whole, or at the tips, are more or less irregular in shape, or
out of the parallel with the straight edge of the shutter, so will be the action at
this point of the tips with the shutter more or less prolonged or irregular, and noise
and vibration thereby diminished and efficiency increased.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
The herein described improvement in fans, that is to say, fans having their vanes,
or the tips thereof, inclined in relation to the axis of the fan or of irregular form,
the tip or the meeting edge of the shutter being of ordinary rectilinear form
parallel with the axis of the fan; operating substantially as and for the purposes
set forth.
•
12
March 1894.
8th day of M
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,
15, Water Street, Liverpool, Applicant's Patent Agents.