Year: 1899

page_text: WILLIAM TATTERSALL, 37, Glasslyn Road, Crouch End, London, N., Ventilating
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in the construction of ventilating fans
of the screwbladed type and the framwork by which they are supported and the
object is to improve the efficiency of the fan and to produce a lighter stronger and
more adjustable frame to increase the efficiency of the fan. I form the centre to
which the blades are attached of the form of a pyramid or cone with the apex
cut off and having ridges or projections formed upon the surface to which the
blades may be attached. The journal on the feed side of the fan I form with a
pocket in which the discs to reduce friction by taking the thrust of the fan are
placed. This pocket or chamber is larger than the bore of the journal so that the
discs also being larger they cannot slip out when the shaft is withdrawn. The
discs are inserted either through the end of the journal which may be closed by a
screw plug or cap or through an opening at the side which may be closed by a
cap. The framework to support the fan I form of two or more brackets with cor-
responding pairs of arms one arm of each pair being in front of the fan and the
other on the discharge side. The brackets which support the whole weight of the
fan I form quite seperate from any ring the body of the bracket flat with lugs
or projections on each side to receive the arms and secure them to instead of
securing the arms to the brackets by bolts passing through the body of the bracket
as is usual. I form in the lugs holes to receive the arms the ends of which are
screwed and secured in position by nuts which render the arms adjustable. As an
alternative the arms may be formed with holes through the ends attached to the
brackets and such ends may fit against or between the lugs which are provided with
corresponding holes through which and the holes in the arms a bolt is passed and
secured by a nut. To secure the journal in position it is clasped by two clips which
are secured together by bolts and nuts and each clip has formed up it one or
more lugs through which the inner ends of the armis pass, the ends of the arms
being screwed and secured in position by nuts-this renders the arms adjustable at
this part. The clips are preferably hollowed out where they clasp the journal
which is formed with a spherical projection to fit the hollowed clip and form a
ball joint. The arms are preferably straight pieces of wrought iron tube to ensure
lightness and strength and the brackets and clips of malleable cast iron. The
brackets may be joined together by pieces of metal formed to the proper radius
to be concentric with the periphery of the fan so as to keep the brackets the proper
distance apart.
AT1
1000

page_text: I, WILLIAM TATTERSALL, of 20, Grove Terrace, in the City of Bradford, Venti-
lating Engineer, and late of 37, Glasslyn Road, Crouch End, London, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement: -
This invention relates to improvements in the construction of ventilating fans
of the screw-blade type, and the framework by which they are supported, and the
object is to improve the efficiency of the fan and to produce a lighter, stronger and
more adjustable frame.
To fully describe my invention reference is made to the accompanying sheet of
drawings forming a part of this specification, in which similar figures of
reference indicate corresponding parts in each of the views.
Figure 1, represents a front elevation of my improved fan and frame.
Figure 2, is a back view of the same.
Figure 3, is a diametrical section of Figure 1.
Figures 4 and 5, are two views of the fan boss shown separately.
Figures 6 and 7. are two views on a larger scale of a modified form of boss with
a portion of one of the blade stavs secured thereto.
The boss or centre 1. of the fan is made in the form of a hollow. truncated
pyramid having as many sides as there are blades 2 to the fan, and the stars
or stiffening bars 3 along the back edges of the blades 2 are secured to the sides.
of the pyramid by the bolts 25. The outer ends of the bars and blades 2 are
coupled together by the annular stay 5. Making the boss 1 of pyramid form
enables the blade stays to be more securely attached thereto.
In Figures 6 and 7 the sides of the boss are made with projections 30 to which
the stays 3 are bolted. The faces of the projections to which the stays are bolted
are made at such an angle that the stays require a slight bend in the direction of
their width only at their junction with the boss. To facilitate moulding the boss
the projections 30 are cast hollow and the belts 25 project through them and their
nuts are screwed on from behind.
The front and back bearings 6 and 7 for the shaft 8 are supported as usual
in divided bearing clips or hollows 9 and 10. The front clip 9 is provided with
lugs 13 coupled by the adjustable rods 14 to lugs 15 projecting on that side of the
attachment bracket 16 designed to be fixed round the aperture in which the fan
is intended to work. The brackets may be connected by a rolled metal ring 17
of or other suitable section. The back bearing clip 10 is provided with
screw sockets 18 adjustably connected by the rods 19 to lugs 20 projecting from
the backs of the brackets 16.
In the bearing on the feed side of the fan I introduce one or more anti-
friction discs 21 which is or are made with rounded faces and are the thickest in
the centre and I form a shoulder 22 in the bearing to prevent the disc or discs
being dislodged when the shaft 8 of the fan is removed from the bearing. A
screw plug 23 fixed by the set screw 24 is fitted in the end of the bearing
to permit of the disc or discs being inserted.
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. A fan having a pyramidal centre bose with the blade on bla

page_text: to the sides, substantially as herein shown and described and illustrated in the
accompanying drawings.
2. A fan having a pyramidal centre boss the sides of which are made with
ridges or projections for the attachment of the blade stay and blades, substan-
tially as herein shown and described.
3. A fan frame consisting of attachment brackets having lugs on either side
from which screwed arms project to support the fan bearings, substantially as
herein shown and described and illustrated in the accompanying drawings.
4. A thrust bearing for a fan fitted with one or more discs 21 retained in posi-
tion in the bearing by a shoulder or projection 22, substantially as herein shown
and described.
Dated this 13th day of November 1899.
DRACUP & NOWELL,
Patent Agents, Bradford.