IMPROVEMENTS IN THE CONSTRUCTION OF FANS TO BE USED FOR VENTILATING, EXHAUSTING AND BLOWING
Year: 1884

page_text: We JOHN LISTER, JOHN WHITTAKER, and JAMES SHELDON, of 35, Corporation
Street, Manchester, Lancashire, Engineers, do hereby declare the nature of said.
Invention for IMPROVEMENTS IN THE CONSTRUCTION OF FANS TO BE USED FOR
VENTILATING, EXHAUSTING AND BLOWING, to be as follows :-
In constructing a fan we form the boss or centre of two or more pieces of metal
shaped in such manner that when the two pieces are placed side by side spaces are
left between them and these spaces are at an angle with the axis of the fan: the
blades or vanes are each formed of a separate piece of sheet metal with the centre
part cut to fit into one of the spaces between the pieces forming the boss or centre
of the fan.
The blades are firmly secured in their respective places by screws or rivets which,
pass through them and the boss or centre of the fan.
We cover the outer portion or periphery of the blades by sheet metal secured in
any convenient manner to the blades, the fan when thus finished is enclosed in a
casing or bonnet the edges of which are turned down to partly cover it.
This improved fan is suitable for exhausting and blowing and when in motion
the air passes from one side between the blades and out at the other side.
JOHN LISTER.
JOHN WHITTAKER.
JAMES SHELDON.
H. B. Barlow,
Agent for Applicants,
7. St. Ann's Square, Manchester..

page_text: We JOHN LISTER, JOHN WHITTAKER, and JAMES SHELDON, of 35 Corporation
Street, Manchester, Lancashire, Engineers, do hereby declare the nature of said
Invention for IMPROVEMENTS IN THE CONSTRUCTION OF FANS, TO BE USED FOR
VENTILATING, EXHAUSTING AND BLOWING, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement :-
In constructing a fan we form the boss or centre of two or more pieces of metal
shaped in such manner that when the two pieces are placed side by side spaces are
left between them and these spaces are at an angle with the axis of the fan; the
blades or vanes are each formed of a separate piece of sheet metal with the centre
part cut to fit into one of the spaces between the pieces forming the boss or centre
of the fan. The blades are firmly secured in their respective places by screws or
rivets which pass through them and the boss or centre of the fan.
We cover the outer portion or periphery of the blades by sheet metal secured in
any convenient manner to the blades; the fan when thus finished is enclosed in a
casing or bonnet the edges of which are turned down to partly cover it and so
reduce the inlet for the air.
This improved fan is suitable for exhausting and blowing and when in motion
the air passes from one side between the blades and out at the other side.
And in order that our Invention may be fully understood and readily carried
into effect we will proceed to describe the accompanying Sheet of Drawings,
reference being had to the figures and letters marked thereon.
Figs. 1, 2 and 3 are views of a fan constructed according to our Invention.
Fig. 1 being a front view showing the inlet for the air. Fig. 2 a back view
showing the outlet and Fig. 3 a sectional elevation of the fan. Figs. 4 and 5 are
views of a centre piece which forms one half of the boss for the blades or vanes
and Fig. 6 shows the completed boss, formed of two centre pieces with the blades or
vanes (in section) secured between them.
The frame a of the fan is made of cast iron or other suitable material and is
formed with a flange a¹ to which the outer cover or bonnet b is secured in any
convenient manner; the shaft is supported in the bearing a² formed preferably
with the frame a and by a bracket d bolted to the frame a and may be driven in
any convenient manner by means of the pulley c¹. The blades or vanes e of the
fan are shaped at their inner ends to fit between two centre pieces ff, see Figs. 4,
5. and 6, and are secured in their places by screws or rivets g which pass through
them and the centre pieces ff to fasten the whole together; a sheet of metal h is
fitted over the outer ends of the blades e and connected to them in any convenient
manner and the centre pieces f f, one or both of which may be formed with a
boss, if desired, are fixed upon the shaft c by a nut and washer, as shown, or
otherwise.
In order to vary the size of the inlet for the air we make the hole or opening in
the frame a of the maximum diameter or size and we reduce the size of this

page_text: opening by means of a ring i secured to the frame a by screws k; by changing this
ring i for one of another size or removing the ring altogether, the size of the inlet
may be readily varied as required.
In all cases we prefer to make the inlet for the air smaller than the outlet.
Fans constructed according to our Invention with the inlet smaller than the
outlet displace the air in front of the inlet so rapidly when the fan is revolving
that a partial vacuum is formed and the air rushing to fill the vacuum passes freely
through the fan without much friction or resistance.
The fan shaft may run in a horizontal, vertical or other position, and the fan
may be employed for exhausting, blowing, or ventilating purposes. The size of the
iulet may be readily varied so as to obtain the best results for any particular class
of work as experience and experiment may determine by changing the ring i
in the manner already described.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed,
We declare that what we claim is
1. The centre pieces ff between which the blades or vans of a fan are secured,
such centre pieces being constructed substantially as herein shown and described.
2. The construction, combination and arrangement of parts forming the
improved fan substantially as and for the purposes herein shown and described.
3. The combination with the blades or vanes e and the metal sheet h, of the
movable metal ring i as shown and described.