Improvements in the Wings or Blades of Air Propellers, Fans, and' the like.
Year: 1899

page_text: Date of Application, 11th July; 1899
Comalata Onnnifiaction Loft 11th for 1900 Accented: 12th May 1900
Date of Application, 11th July; 1899
Complete Specification Loft,
44th Anr 1000-Accented: 12th May 1900
PROVISIONAL SPECIFICATION.
Improvements in the Wings or Blades of Air Propellers, Fans,
and' the like.
:
I, JOHN THOMPSON COPE, of 86, Tiverton Road, Selby Oak, Birmingham, in
the County of Warwick, Hot Water Engineer, do hereby declare the nature, of
this invention to be as follows:-
This invention relates mainly to that class of apparatus known as air pro-
pellers, fans and' the like as used for ventilating purposes and for exhausting
dust fumes and vapours from workrooms or for producing a current of air
for drying or warming purposes, and consists in constructing the wings or blades
Instead of the wings
of such air propellers or fans in the following manner.
or blades being of a plain smooth surface of sheet metal as usual, I construct
the same of a corrugated surface. The corrugations looked at from the face
of the propoller or fau may run in a radial or concentric or eccentric circular
direction with reference to the propeller or fan spindle or may be formed in
a zig-zag direction. The wings or blades may be set at any angle as desired
and may be curved or bent either radially or otherwise. The corrugations. on
the wings or blades in cross section may be in accordance with my invention
either semicircular triangular or rectangular in sliape the object being to
afford a better grip of the air to prevent slip and to increase the acting area
of the propeller or fan wings or blades.
4h 10th day of July 1899
"
:
Improvements in the Wings or Blades of Air Propellers, Fans,
and the like.
I, JOHN THOMPSON COPE, of 86, Tiverton Road, Selby Oak, Birmingham, in
the County of Warwick, Hot Water 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 relates mainly to that class of apparatus known as air pro-
pellers, fans and the like as used for ventilating purposes and for exhausting
dust fumes and vapours from workrooms or for producing a current of air
for drying or warming purposes and consists in constructing the wings or blades
Instead of the wings
of such air propellers or fans in the following manner.
or blades being of a plain smooth surface of sheet metal as usual, I construct
the same of a corrugated surface. The corrugations looked at from the face

page_text: of the propeller or fan may run in a radial or concentric or eccentric circular
direction with reference to the propeller or fan spindle or may be formed in
a zig zag direction. The wings or blades may be set at any angle as desired
and may be curved or bent either radially or otherwise. The corrugations on
the wings or blades in cross section may be in accordance with my invention
either semi-circular triangular or rectangular in shape the object being to
afford a better grip of the air to prevent slip and to increase the acting area
of the propeller or fan wings or blades. In the accompanying slicet of drawings
to be hereinafter referred to-Figure 1 is an elevation of an air propeller or
fan the wings or blades of which are constructed in accordance with my invention
with the corrugations made in an eccentric circular direction. Figure 2 is an
elevation of an air propeller or fan constructed in accordance with my invention
with the corrugations of the wings or blades in a modified form. Figures 3 and 4
shew horizontal sections of Figures 1 and 2 respectively. The same letters
of reference apply to corresponding parts in all the figures.
In Figures 1 and 3A A is the circular framecof an air propeller or fan as
ordinarily constructed, B is the spindle of same carrying the wings or blades C C
which are attached to the hub b with adjustable bracket bolts 6 with lock nuts 63
as shewn or in any other equivalent manner, The spindle is mounted on
brackets with bearings as usual! aa shew the flanged feet of a three armed front
bracket bolted to the circular frame A. My invention relates to.'the currugating
of the wings or blades CO. In Figures and 3 the corrugations as shewn
at ce are arranged in an eccentric circular direction relatively to the centre
of the spindle B. At a c¹ these corrugations are shown in cross section assum-
ing a somewhat of a triangular shape the shoulder tending to prevent the
air from being driven outwards by the centrifugal force of the revolving wings
or blades and to move the column of air in a direction parallel to the spindle
of the propeller or fan. In Figures 2 and 4 the wings or blades C C are made
with corrugations of a different shape in elevation as shewn at cc these corru-
gations at suitable angles from the outer edges of the wings or blades meeting
at an obtuse angle at or near the centre of the wings or blades as shewn at c
The corrugations in cross section with shoulder may be of triangular or
other section with rounded corners but in this case the wings or blades are shewn
as sloping from the hub to the rim the whole assuming a conical shape, which
I may sometimes prefer. The corrugations in either case may be made of the
section shewn or of any suitable section either mainly triangular with shoulders,
or partly or wholly circular for the purposes herein before described, and may
be made or formed with stamps or rollers in the case of malleable sheet metal
or other suitable material, or the wings or blades may be made of thin cast
metal. Two, three or any other number of wings or blades may be used and
and may be set at any desired pitch or angle with the axis. It is obvious that
many variations in details may be made without departing from the nature of
this invention.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed. I declare that what
I claim is:-
1. The construction and use of wings or blades of air propellers fans and the
like corrugated substantially as and for the purposes herein before described and
Bet forth.