An Improved Rotary Pump Blower or Exhauster.
Year: 1887

page_text: Date of Application, 20th Oct., 1887
Specification Accepted, 20th Dec., 1887
An Improved Rotary Pump Blower or Exhauster.
We JOHN EDEY of 10 St. Swithins Lane in the city of London Chartered
Accountant and GEORGE WRIGHT of Cottenham Road Rotherham 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:
Fig. 1. is a plan.
Fig. 2 is a front elevation shewing inlet and delivery.
Fig. 3 is an end elevation shewing the guide wheels and stop cock.
Fig. 4 is a section cut through the centre shewing the propellers and interior.
A is a bed plate upon which the whole of the machine stands. B. B are two
castings which are bolted upon A and form each end of the machine, the bearings for
the shaft are cast on the same. Each of these castings has a cavity from front to
back through which the air is collected shown in dotted line Fig. 1 and front
elevation Fig. 2 also in section Fig. 4. There is also a jacketed by-pass in each of
these castings marked N N which allows the pressure to escape between the teeth of
the propellers. Care two circular castings which form the top and bottom cover
for the propellers. These castings are flanged all round. D is the spout by which
the blast is conveyed to the fire and in it is inserted the stop cock E.
This spout is
bolted to the circular castings CC having a flange on the large end for that purpose.
The flange on the small end is to connect any pipe to it that may be required. E is
the stop cock with a circular plug, the middle of which plug is cut away except a
small portion on one side which is just sufficient to cover the orifice of delivery so
that when the same is turned round there is no obstruction whatever to the blast.
FF are two shafts upon which the propellers G G are keyed and also the guide
wheels H H. On the top shaft is also keyed the driving pulley I. G G are the two
propellers which are made of cast iron or other suitable material the bodies of which
run close together, in each propeller are cast 4 spaces and also 4 wood teeth are
inserted at equal distances between those spaces, so that when the two are put
together the teeth of the one fall into the spaces of the other and run together as a
pair of wheels, the action of which is clearly shown in section fig. 4. The teeth in
these propellers might be of metal and covered with any soft material to prevent

page_text: noise. H H are two wheels having an irregular pitch line and are so constructed as
to guide the propellers properly in their action by being keyed firmly upon the shafts,
the centre of the spaces at the extreme diameter of the wheel being keyed in a line
with the centre of the teeth of the propeller on the same shaft and when the two guide
wheels are put into gear the large diameter of the one is put to the small diameter of
the other which produces a variable motion of fast and slow. This is shown in an
end elevation fig. 3. I is the driving pulley which is keyed on the top shaft of the
machine it can also be driven from the bottom if preferable. J is an inlet which is
formed in castings B B, by which the air is drawn from the front to the back by the
propellers there being an opening in the side of this casting at the back which is
shewn in dotted line on plan Fig. 1 also at the back of the propellers Fig. 4 marked O.
K is the outlet through which the blast is delivered from the propellers and propelled
through the spout D-L L are two cyphon boxes formed in the top of castings B B
which hold the oil for lubricating the necks. M M M M are 4 tubes cast in cyphon
boxes L L which conduct the oil with an ordinary trimming feeder down to the
necks. NN are two by passes which are jacketed and formed in the centre of the
castings B B and are shewn in plan Fig. 1. also in section Fig. 4. These by-passes
are to relieve any pressure that may have accumulated between the teeth of the
propellers by allowing the propellers to force such air through the by-passes and so
increasing the pressure on the delivery side of the propellers. O shews the outlet of
the inlet passage J where the air is collected by the propellers G G. The inlet and
outlet of the machine is on the same side. This may also be varied if required also
the number of teeth in the propellers. Their length may also be varied without
departing from the principles of this specification.
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
1st. The Propellers.
2nd. The variable wheels which guide the same in their action.
3rd. The by-passes for relieving the pressure.
nd its arrancament
Dated this 18th day of October 1887.
Signed by the said GEORGE WRIGHT and
JOHN EDEY, in the presence of
CHAS. SIMPSON,
27, Change Alley, Sheffield,
Chartered Accountant.
GEO. WRIGHT.
JOHN EDEY.