Improvements in Ventilating Fans.
Year: 1889

page_text: Date of Application, 13th Aug., 1889
Complete Specification Left, 9th May. 1390-Accepted, 13th Aug., 1890
PROVISIONAL SPECIFICATION.
Improvements in Ventilating Fans.
We, WILLIAM MATTHEWS, JOSEPH YATES and WALTER YATES all of Todd Street
Manchester in the County of Lancaster, Ventilating Engineers, do hereby declare
the nature of this invention to he as follows:-
This Invention relates to ventilating fans and these Improvements consist in the
arrangement of the blades or vanes, and in the construction of the boss and the means
of attaching the blades thereto.
The blades may be of any convenient and suitable form but we prefer to make them
with a straight leading edge, a curved following edge and a longitudinal curvature,
and we arrange them on the face of the boss helically or at an angle to the axis of
the fan.
The boss to which the blades are to be attached is flanged or is otherwise formed so
that sufficient surface may be provided on the face of the boss for the blades to be
attached thereto by means of rivets, bolts, or set screws.
The helical direction of the
blades may be obtained by giving them a partial twist, but we prefer to cast or other-
wise form seatings on the face of the boss in such a manner that when the blades are
fixed thereon they will be at an angle to the axis of the fan.
Dated this 12th day of August A.D. 1889.
WILLIAM E. HEYS,
Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Ventilating Fans.
We, WILLIAM MATTHEWS, JOSEPH YATES and WALTER YATES, all of Todd Street
Manchester in the County of Lancaster, Ventilating Engineers, 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 ventilating fans and these Improvements consist in con-
necting or securing the blades of a fan to the face of the boss in such a manner
that each blade shall be at an angle to the plane of rotation or form a section of
a helix.
We will describe in what manner our Invention may be carried into practical effect
with reference to the accompanying drawings in which Figure 1 is a plan of a fan
constructed according to these Improvements but with part of the framing omitted;
Figure 2 is a back elevation, Figure 3 is a front elevation, and Figure 4 is a side view
of the boss.
The blades or vanes A A may have any suitable form and construction and we do
not limit ourselves in this respect, but we find the form represented in Figure 1, that
is to say a blade having a straight leading edge, a curved following edge, and a curved
cross section gives as good results in practice as any of the many forms with which
we have experimented.
Upon the face of the boss of the fan we cast or otherwise produce as many angular
seatings B B as the fan is to have blades.
In the fan represented in the drawings, four blades are used but it will be under-
stood that any suitable and convenient number may be employed as in similar fans of
ordinary construction.
The inner ends of the blades are formed to fit the angular seating formed on the
face of the boss C and they may be secured thereto by means of rivets, set-screws,
[Price 6d

page_text: It is desirable that
bolts and nuts, or by other suitable means as shown by Fig. 1.
the rivets or other devices for securing the blades to the boss should not project to
any considerable extent beyond the face of the blade or of the boss, and we therefore
prefer to use rivets or set screws and when practicable with counter-sunk heads, or
in the case of small fans, to braze or "sweat" the blades upon the seatings.
The blades A being secured to angular seatings B on the face of the boss, it follows
that the blades themselves will be at an angle to the axis of revolution and also to the
plane of rotation, as represented by Figure 1.
A fan constructed and arranged according to these Improvements may be mounted
upon a spindle and in a frame or casing as in other fans of a similar type and as is
well understood.
Having now particularly described and ascertained the nature of our said Inven-
tion and in what manner the same is to be performed, we declare that, what we
claim is :-
(1) A ventilating fan constructed and arranged substantially as hereinbefore
described and as illustrated by the accompanying drawings.
(2) In a ventilating fan, a boss having angular seatings upon its face; substantially
as and for the purpose hereinbefore described and as illustrated by the accompanying
drawings.
(3) In a ventilating fan, securing the ends of the blades upon specially constructed
scalings on the face of the boss, substantially as hereinbefore described and as illustrated
by the accompanying drawings.
Dated this 20th day of April AD 1890
WILLIAM E, HEYS,
Agent for the Applicants.