IMPROVEMENTS IN VENTILATING APPARATUS
Year: 1883

page_text: LETTERS PATENT to Alfred Julius Boult of 323 High Holborn in the county
"
of Middlesex Engineer for an Invention of "IMPROVEMENTS IN VENTILATING
APPARATUS a communication from Levi Julian Wing of New York, United
States of America, Manufacturer.
PROVISIONAL SPECIFICATION left by the said Alfred Julius Boult at the
Office of the Commissioners of Patents on the 2nd October 1883.
ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
Engineer, "IMPROVEMENTS IN VENTILATING APPARATUS" [a communication from
Levi Julian Wing of New York, United States of America, Manufacturer]
This invention relates to an apparatus for ventilating buildings factories, rooms,
nines, and for other similar purposes and consists essentially in a novel construction,
arrangement and combination of a fan wheel and its blades and connections
whereby provision is made for adjusting the various parts to different positions.
The ventilator has a cylindrical casing whose ends or sides are of skeleton form
and cast of iron so made and arranged as to allow a pipe to be slipped on either
end for the purpose of carrying air any distance required, and provided with
adjustable journal boxes in which the fan shaft has its bearings. These boxes or
bearings are divided and provided with set screws by means of which they may be
adjusted at pleasure. The lower box of each bearing is cast hollow or in two
sections and forms an oil cellar receiving the surplus oil applied, or it may be
filled when first used; in the centre of this lower box is placed a worsted or cotton
wick with one end touching the bearing of the shaft keeping the bearing
lubricated.
The fan blades are curved in their cross section and spread from their inner to
their outer end for the purpose of producing a gradually increasing or expanding
pitch from the anterior to the posterior portion of the blade. The anterior part of
the surface of the blade having set the air in motion the posterior portion of the
blade having a greater and expanding pitch, propels the air with greater and
increased velocity. Each blade is held in position by a wrought iron arm to
which the blades are rivetted or bolted. Each arm has a thread cut on it to screw
rD.J
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page_text: it into the hub, with a jam nut between said hub and the blade. The pitch of the
blade can be increased or diminished to suit different circumstances by slackening
the jam nut and turning or changing the angle of blade with the shaft, then
tightening the jam nut against the hub to retain it in position thereby enabling
the ventilating fan to be changed from an exhaust fan to a force blower without
changing the position of the fan, belts, pipes &c, it being only necessary to change
the angle or position of the blades. Thus it can be adapted to suit demands
in use.
The blades can be reversed so as to change the fan from an exhaust to a force
blower, that is, the blades being reversed by slackening the jam nut and being
turned around, the curvature of the blades is reversed. This is done without
changing the direction of the fan and without any change of belt.
The hub is held fast on the shaft by means of set screws. Between the hub
and the bearings on the shaft are placed collars held in place by set screws.
When it is desired to change the pulley from one end of the shaft to the other,
all the set screws are loosened, the pulley is then removed, the shaft moved
longitudinally to the desired position after which the set screws are tightened as
before. That is to say: if it is not practicable or advisable to drive the fan with
the pulley on the receiving side of the fan, the shaft can be pushed through and
driven from the delivery side.

page_text: This invention relates to an apparatus for ventilating buildings, factories, rooms,
mines and for other similar purposes.
This invention consists essentially in a novel construction arrangement and
combination of a fan wheel and its blades and connections whereby provision is
made for adjusting the various parts to different positions all as hereinafter more
particularly described
In the accompanying drawing Figure 1 represents a side view of my improved
ventilator or Disc Fan.
Figure 2 is a transverse vertical section, taken in the line X X figure 1.
Figure 3 is a cross section of blade taken in line Y Y figure 1.
Similar letters indicate similar parts.
The Cylindrical casing A has its ends or sides of skeleton form and of cast iron
so made and arranged as to allow a sheet iron pipe to. be slipped on either end for
the purpose of carrying air any distance required and provided with adjustable
journal boxes B in which the fan shaft C has its bearings These boxes or bearings
are divided and are provided with set screws b by means of which they may be
adjusted at pleasure. The lower box of each bearing is cast hollow or in two
sections and forms an oil cellar receiving the surplus oil applied or may be filled
when first used, in the centre of this lower box is placed a worsted or cotton wick
with one end touching bearing of shaft keeping the bearing lubricated
The fan blades D are curved in their cross section as shown in Figure 3 and are
spread from their inner to their outer end for the purpose of producing a gradually
increasing or expanding pitch from the anterior to the posterior portion of the
blade. The anterior part of the surface of the blade having set the air in motion
the posterior part or portion of the blade having a greater and expanding pitch
propels the air with greater and increased velocity. Each blade is held in position
by a wrought iron arm to which the blades are riveted or bolted. Each arm has a
thread cut on it to screw it into the hub E, with a jam nut e between said hub and
the blade. The pitch of the blade can be increased or diminished to suit different
circumstances by slackening the jam nut e and turning or changing the angle of
blade with shaft then tightening jam nut against the hub to retain it in position,
thereby enabling the ventilating fan to be changed from an exhaust fan to a force
blower without changing position of fan belts, pipes etcetera it being only necessary
to change the angle or position of the blades Thus it can be alternated to suit
demands in use
The blades can be reversed so as to change the fan from an exhaust to a force
blower that is the blades being reversed by slackening the jam nut and being
turned around the curvature of the blades is reversed. This is done without
changing the direction of the fan and without any change of belt
The hub E is held fast on the shaft C by means of set screws ƒ Between the
hub and the bearings B on the shaft C are placed collars G held in place by the
set screws h As here shown the driving shaft C has a driving pulley J at
one end.
When it is desired to change the pulley J from one end of the shaft to the other
the set screws b. fand h are loosened the pulley is then removed and the shaft

page_text: are
moved longitudinally to the desired position after which the set screws
tightened as before that is if it is not practicable or advisable to drive the fan
with the pulley J on the section or receiving side of fan the shaft can be pushed
through and be driven from the delivery side of the fan
Having now described this invention and the method of performing the same
as communicated to me by my foreign correspondent I claim and desire to protect
under the herein before in part recited Letters Patent is.
1. A. ventilating fan having its blades curved transversely and spread from the
inner to the outur end to produce an expanding pitch from the anterior to the
posterior edges of the blades in combination with a means for adjusting the angle
of such blades relatively to the axis of the fan, as and for the purpose herein
described
2 In a ventilating fan, the combination of a hub E fan blade D curved in cross
section and spread from the inner to the outer end, screw shank d and jam nut e
substantially as and for the purpose herein described
3. The combination of the adjustable shaft C hub E and set screw f with the
fan blades and the detachable pulley fixed to said shaft as herein shown and
described
4. In a ventilating fan the combination with the adjustable shaft C and with
the fan blades, and detachable pulleys fixed to said shaft of the divided boxes or
bearings B and set screws b as herein shown and described
5 In a ventilating fan the combination with the longitudinally adjustable
shaft C and with the fan blades, and detachable pulley fixed to said shaft of the
boxes or bearings B and set screws 6 the collars G and set screws h and the hub E
and set screws substantially as and for the purpose shown and described.
In witness whereof I the said Alfred Julius Boult have hereunto set my hand
and seal this second day of April in the year of our Lord One thousand eight
hundred and eighty four.
ATDDED T POULT