Year: 1887

page_text: Date of Application, 11th Nov., 1887
Complete Specification Left, 11th Aug., 1.88
Complete Specification Accepted, 14th Sept., 188
1, WALTER YATES of 55 Market Street Manchester in the County of Lancaster,
Manager of the Climax Air Propeller Company, do hereby declare the nature of this
invention to be as follows
11
This Invention relates to fans employed for circulating air or gases,
for ventilating
rooms and for the like purposes, and these Improvements consist in an improved form
and construction of the vanes or blades of such fans and in their disposition or
arrangement.
The vanes or blades are each formed of a single strip or sheet of metal to which a
gradually increasing curvature is given from near the boss to the extremity of the
blade, or the gradually increasing curvature may be limited to the outer part of the
blade, in which case the inner part will be radial or straight. No other twist or
curvature is given to the blades which are secured to the boss of the fan or to arms
secured to the boss in such a manner that the blades are all at a similar angle to their
plane of revolution.
AL
A
1007
WILLIAM E. HEYS,
Agent for the Applicant.

page_text: I, WALTER YATES of 55 Market Street Manchester in the County of Lancaster,
Manager of the Climax Air Propeller Company, 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 Fans employed for circulating air or gases for ventilating
rooms and for the like purposes, and these Improvements consist in an improved form
and construction of the blades or vanes of such fans and in their disposition or
arrangement.
According to my Improvements, the blades or vanes are each formed of a single
strip or sheet of metal to which a gradually increasing curvature is given. This
gradually increasing curvature may extend from or from near to the boss of the fan or
it may be limited to the outer part or end of the blade, in which case the inner part
of the blade will be straight or have a plane surface. No other twist or curvature is
given to the blades which are secured to the boss in such a manner that the blades are
all at a similar angle to their plane of revolution.
My Improvements are illustrated by the accompanying drawings to which reference
will hereinafter be made. In each of the Figures similar parts where they occur are
denoted by similar letters of reference.
Figure 1 is an end view, and Fig. 2 is a plan of a suitable boss or centre to which
the blades of the fan may be secured. Fig. 3 is an elevation of the fan disconnected
from the framing, spindle, and bearings, and Fig. 4 is a transverse section through
the boss and one of the blades.
In ventilating fans constructed according to our Improvement the blades are not
enclosed within a casing as in fans of the Schiele type, but are carried in an open
framing as in the fans of the Blackman, Crossley and other well known types
commonly known as "Air Propellers."
As represented in the drawings, the curvature of the blades A A is limited to the
outer ends, but as already described, the curvature may extend from or from near to
the boss B. Each blade is formed from a single sheet or strip of metal and has no
other bend or curvature than the longitudinal curvature, that is to say, every cross
section of the blade is straight.
The boss B has cast or formed upon it as many wings or projections C (' as there
are blades in the fan, and in these wings holes D D are formed through and by means
of which the blades may be bolted rivetted or similarly secured to the boss.
In the larger sizes of the fans, and generally when it is desired to secure greater
strength and rigidity for the blades I secure to the back of each blade a rib or
strengthening piece E which may extend from the boss to the tip of the blade or to an
intermediate point on the back of the blade.

page_text: The number of the blades will depend upon the size of the fan, the speed of its
rotation and other conditions but for ordinary purposes I prefer to employ five
blades.
Each blade is fixed at a similar angle to the plane of revolution and the wings C C
upon the boss B have their faces to which the blades are attached, formed at the same
angle.
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
In ventilating fans or "air propellers "; blades each having a limited or extended
longitudinal curvature and straight cross sections and each being arranged at a similar
angle to the plane of rotation; substantially as hereinbefore described and as illustrated
by the accompanying drawings.