Improvements in Ventilating Fans.
Year: 1892

page_text: Date of Application, 11th Feb., 1892
Complete Specification Left, 8th Dec., 1892-Accepted, 11th Feb., 1893
PROVISIONAL SPECIFICATION.
Improvements in Ventilating Fans.
WILLIAM WINSHIP WARDLE 32 Somerfield Road Finsbury Park London, N.
Engineer, do hereby declare the nature of this invention to be as follows:-
The object of this invention is to so construct a fan as to obtain greater
propelling power coupled with more silent running; I obtain these advantages as
follows: The vanes are formed from or mounted upon a disc which revolves upon
an axle passing through its centre, and the central portion of the disc for about one
third its radius is closed and flat. To give the blades the proper form, as many
equidistant points are taken upon the periphery of the closed central part of the
disc as there are to be vanes, and through these equidistant points radial lines are
drawn to the periphery of the whole disc. I cut the disc through for the remainder
of the radius beyond the closed portion, thus forming the desired number of vanes.
The curved part of each vane is a segment of a cone, the apex of which is upon
each of the equidistant points before referred to as being upon the periphery of the
closed central part of the disc. The vanes are formed in pairs, one of each pair
acting on alternate sides of the plane of the disc. The vanes upon one side of the
disc revolve within a tube or tunnel, the alternate vanes on the outside of the tube
or tunnel being bent at their junction with the closed central portion of the disc
away from its plane. When required I connect the vanes at their periphery by a
metallic ring or equivalent.
In special cases I use a cone shaped addition attached to the central portion of
the disc of the fan on either or both sides of it.
Dated February 11th 1892.
FRANCIS M. ROGERS,
Agent.
COMPLETE SPECIFICATION.
Improvements in Ventilating Fans.
I WILLIAM WINSHIP WARDLE 32 Somerfield Road, Finsbury Park, London,
N. 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 :-
•
The object of this invention is to so construct a fan as to obtain greater propelling
power coupled with more silent running. I obtain these advantages as follows:-
The vanes are formed from or mounted upon a disc which revolves upon an axle
passing through its centre, and the central portion of the disc for about one third
its radius is closed and flat. To give the blades the proper form, as many equidistant
points are taken upon the periphery of the closed central part of the disc as there
are to be vanes, and through these equidistant points radial lines are drawn to the
periphery of the whole disc. I cut the disc through for the remainder of the radius
beyond the closed portion, thus forming the desired number of vanes. The curved
part of each vane is a segment of a cone the apex of which is upon each of the
equidistant points before referred to as being upon the periphery of the closed
central part of the disc. The vanes are formed in pairs, one of each pair acting on
alternate sides of the plane of the disc.
The vanes upon one side of the disc revolve within a tube or tunnel, the alternate
vanes on the outside of the tube or tunnel being bent at their junction with the
closed central portion of the disc away from its plane.

page_text: To enable my invention to be clearly understood I will now describe the same
more particularly by means of the drawing, in which :-
Fig. 1. is a vertical section upon line A. B. Fig. 2.
Fig. 2. is a front view looking in the direction of arrow shewn in Fig. 1.
Fig. 3. is a front view of a disc as it appears before forming the curved portion
of the vanes.
Fig. 4. is a plan looking up, of part of Fig. 2. shewn by dotted lines.
Fig. 3. shews the first described manner of forming the ranes from a disc of iron,
steel or other suitable metal. 1, is the disc, which for about one-third of its radius..
is closed and flat. In the case now described I have shewn twelve blades or vanes a,
which. I form by taking twelve equidistant. points upon the periphery of the closed
central portion of the disc 2, and through these points radial lines 3, are drawn to
the periphery of the whole disc. The disc is now cut through by suitable means
such as a metal. shearing machine or equivalent device, as shewn; in this manner.
dividing and partially forming the blades or vanes a. Pairs of blades or vanes are
now bent upon a mandril or mould so that the curved part of each vane is a segment
of a cone, having for its apex one of the equidistant points. 2, upon the periphery of
the closed central portion of the disc and so that one vane of each pair shall when
mounted up, act on alternate sides of the plane of the disc, (see Figs. 1. and 4)..
The disc is bored as at 4, and mounted between cheeks upon a spindle, or in any like
suitable manner.
Figs. 1 and 2, shew the method I employ when the vanes, are mounted, upon..a
separate disc, which in such case is preferably cast in iron or other metal: 1, is the
closed central portion, the periphery of which is divided out as just described.and.
fashioned into as many pairs of lugs 5, as there, are. vanes, so bent as that one vanen
of each pair when curved in the manner described, and secured by bolts or rivets 6;.
as shewn, shall act on alternate sides of the plane of the disc, when rotated: by
means of the pulley or equivalent 7, keyed to spindle 8, secured to the hub.9.
When in working position the vanes on one side of the disc revolver within a.
tube or tunnel 10, the alternate vanes revolving upon the outside. (see Figs. 1,14,):
or the outside. vanes may be enclosed in a tube or tunnel if greater pressure is
required.
In ventilating fans constructed in the manner hereinbefore described, the vanes
outside the tunnel collect the air which is received, and pressed forward by the
vanes within it. In this manner 1 obtain greater propelling power coupled with
silent running.
Having now particularly described and ascertained the nature of my;said inven-
tion and in what manner the same is to be performed,. I declare, that, what. I.
claim is :-
1. In a ventilating fan the particular construction combination and use of vanes..
in pairs formed from or.mounted upon a disc and so moulded or shaped as that..the
curved.part of. each vane is a segment of a cone, and so that one vane of each pair.
acts upon alternate sides of the plane of revolution of the disc, for the purpose, and..
in the way, and. manner described.
2. In a ventilating fan constructed as described the particular method of mounting
the same so that the vanes upon one side of the disc revolve within, but those-upon
the opposite side, revolve without the air way, tube, or tunnel.
Dated December 8th 1899-
FRANCIS M. ROGERS,.
Agont...