Improvements in Disc Pumps and Blowers.
Year: 1895

page_text: Date of Application, 18th Feb., 1895
Complete Specification Left, 31st Oct., 1895-Accepted, 18th Jan., 1896
PROVISIONAL SPECIFICATION.
Improvements in Disc Pumps and Blowers.
ROBERT JOSEPH DAWSON Salisbury Villas Norton Lees, Sheffield, Derbyshire,
Draughtsman, do hereby declare the nature of this invention to be as follows:-
The object of this invention is to improve disc pumps and blowers by doing
away with the conical part of the casings whilst retaining the conical action of the
disc and in so constructing the disc that it will work in a spherical chamber having
flat instead of conical sides.
In all machines of the disc class the discs work in spherical casings between two
cones having the same axis, the contact surfaces between the sides of the discs, and
the casings being upon the cones of the casings, the discs are flat and must roll
perfectly true upon the coned sides to ensure constant contact with them, the
more accurately these surfaces fit together the greater is the efficiency of the
machine.
My present improvements consist in making disc pumps and blowers with spherical
casings having flat or parallel sides instead of having conical sides and also in
making discs in such a form that they will fit and work in such casings; this
establishes an entirely new form of casing and a new form of disc, the new form of
casing being spherical with flat sides whilst the new form of disc is no longer made
flat but has its opposite faces equally inclined on both sides to the plane of the
disc, so that the angle included between the inclined faces of the disc is equal to
the angle described by the disc's motion within the casing; thus: if the angle
described and included by the disc in passing from one side of the casing to the
other be 45°, then by making the inclined faces upon the disc include an angle
of 45° (the apex of such angle being outside the disc's circumference) the contact
faces of such disc will be at right angles with the main axis of the machine; but
as the sides of the casing are made flat and also at right angles with the main
axis of the machine the two surfaces are always brought into contact in the same
plane.
In order to obtain the maximum of advantages from this improved form of
machine the flat sides of the casing where contact is made with the disc may have
annular or other shaped chambers in them fitted with setting up rings or blocks
forming portions of the sides which being so made are adjustable whilst the
machine is at work, in some cases these adjustable blocks, or rings, may be fitted
with springs able to yield to any excessive pressure in the machine and acting as a
bye pass, or safety valve for it, but so adjusted as to resist the maximuin working
pressure and retain the rings or blocks in their normal positions in the sides of the
casing, so that when once properly adjusted the rings are kept in their proper
positions for contact with the disc on both sides of the machine, or can be adjusted
from the outside without stopping the machine.
These improved casings may be made to carry the bearings for a driving shaft
and they may have inlet and outlet ports in any required part of them, they may
be made independently of a bed plate, or be mounted upon one, the partition plate
may be either part of the pump case, or of the suction and delivery branches, or be
in the bed plate. This partition plate, which holds the disc and prevents it from
rotating, may be fitted with a metallic, or other form of setting up block, also
made adjustable from outside the machine whilst it is at work, such partition plate
[Price Rd

page_text: may be made either flat, or curved, so that the disc in rolling upon it from side to
side of the casing, drawing in air, or water, or other fluid on one side and expelling
it on the other is allowed to travel freely and with the least possible amount of
friction the edges of the notch in the disc are also suitably shaped for this
purpose.
:
The improved form of disc, (which is of course circular,) instead of being flat or
tapered from the centre outwards, is only partly flat, or not flat at all, but has
projections upon both sides forming the inclined faces hereinbefore described, such
projections being thickest near the centre of the machine and thinnest at the
outside edge of the disc.
The disc I may make by preference in segmental portions which may be held
together by screws, or gluts, or other suitable contrivance, it may be a part of the
driver and solid with it, or it may be clipped upon, or fastened to it by a ring or
other suitable arrangement fitted in, or to, the periphery of the disc, outside of
which ring, or other suitable arrangement, a Ramsbottom, or other form of ring,
or equivalent is placed to make the joint between the disc and the spherical part
of the casing the disc is also slotted out to work upon the sides of the partition
plate.
For the purpose of driving my improved disc in a spherical casing having flat or
parallel sides I may employ any suitable mechanical motion which describes a cone
having its apex in the centre of the disc.
Dated this 16th day. of February 1895.
Improvements in Disc Pumps and Blowers.
ELIZABETH DAWSON Executrix of the late Robert Joseph Dawson 43 Albert
Road Heeley Sheffield Yorkshire Draughtsman, do hereby declare the nature of
this invention and in what manner the same is to be performed, to be particularly
descrived and ascertained in and by the following statement :-
The object of this invention is to improve disc pumps and blowers by doing
away with the conical part of the casing whilst retaining the conical action of
the disc, and in so constructing the disc that it will work in a spherical chamber
having flat instead of conical sides.
In all machines of the disc class the discs work in spherical casings between two
cones having the same axis, the contact surfaces between the sides of the discs and
the casings being upon the cones of the casings; the discs are flat and must roll
perfectly true upon the coned sides to ensure constant contact with them, the
more accurately these surfaces fit together the greater is the efficiency of the
machine.
My present improvements consist in making disc pumps and blowers with
spherical casings having flat or parallel sides, and also in making discs in such a
form that they will fit and work in such casings: this establishes an entirely new
form of casing and a new form of disc, the new form of casing being spherical
with flat sides, whilst the new form of disc is no longer made flat, but has its
opposite sides equally inclined to the plane of the disc, so that the angle included
between the inclined faces of the disc is equal to the angle described by the disc's
motion within the casing; thus: if the angle described by the disc and included
by it in passing from one side of the casing to the other be 45°, then by making
the included angle between the inclined faces of the disc 45° (the apex of such
angle being outside the dise's circumference) the contact faces of such disc will
be at right angles with the main axis of the machine; but as the sides of the

page_text: casing are flat and also at right angles with the main axis of the machine, the two-
surfaces are always brought into contact in the same plane.
In order to obtain the maximum of advantages from this form of machine as
improved by me, the flat sides of the casing where contact is made with the disc
may have annular or other shaped chambers in them fitted with setting up rings
or blocks forming portions of the sides, which being so made are adjustable whilst
the machine is at work; in some cases these adjustable blocks or rings may be
fitted with springs to enable them to yield to any excessive pressure in the machine
and acting as a bye-pass or safety-valve for it, but so adjusted as to resist the
maximum working pressure and retain the rings or blocks in their normal positions
in the sides of the casings, so that when once properly adjusted the rings are kept
in their proper positions for contact with the disc on both sides of the machine or
can be adjusted from the outside without stopping the machine.
These improved casings may be made to carry the bearings for a driving shaft
and they may have inlet and outlet ports in any required part of them; they may
be made independently of the bed plate, or be mounted upon one; the partition
plate may be either part of the pump case, or of the suction and delivery branches,.
or be in the bed plate.
This partition plate which holds the disc and prevents it from rotating may be.
fitted with a metallic or other form of setting up block, also made adjustable from
outside the machine whilst it is at work, such partition plate may be made either
flat or curved so that the disc in rolling upon it from side to side of the casing
drawing in air, water or other fluid on one side, and expelling it on the other, is
allowed to travel freely and with the least possible amount of friction; the edges.
of the notch in the disc are also suitably shaped for the purpose.
The improved form of disc (which is of course circular) instead of being flat
or tapered from the centre outwards is only partly flat (or not flat at all) has
projections upon both sides forming the inclined faces hereinbefore described,
being thickest near the centre of the machine, and thinnest at the outside edge of
the disc.
The disc I may make, by preference, in segmental portions which may be held
together by screws, gluts or other suitable contrivance; it may be a part of the
driver and solid with it, or it may be clipped upon or fastened to it by a ring or
other suitable arrangement fitted in or to the periphery of the disc, ontside of
which ring or other suitable arrangement a Ramsbottom or other form of ring or
equivalent is placed, to make the joint between the disc and the spherical
part of the casing; the disc is also slotted out to work upon the sides of the
partition plate.
For the purpose of driving my improved disc in a spherical casing having flat
or parallel sides I may employ any suitable mechanical motion which describes a
cone having its apex in the centre of the disc.
The machine may be driven by belt or gearing or attached direct to a steam,
gas, air or other engine or to an electric motor.
Figure 1 of the accompanying drawing is a transverse section through a disc
pump or blower of my invention.
Figure 2 is an end elevation of the same (partly in section).
A is the spherical part of the casing. B B are flat or parallel sides of the same.
C is the centre or axis of motion. D is the disc having inclined sides or faces E E.
which inclined faces include the angle P Q R (whose apex Q is outside the
periphery of the disc) which angle is equal to that made by the plane of the
disc during one complete gyration, namely the angle S T U.
FF are the setting up rings, G G the setting up springs, and H H the adjusting
screws. L is a Ramsbottom ring or equivalent for making a joint or packing
between the disc periphery and the spherical part of the casing. K is a clip
ring, whose object is to hold together the segmental portions of the disc D
(if so made). L, is the division or partition plate which holds the glut piece M,.
adjustable by the screw N.

page_text: Having now particularly described the nature of my said improvements and
the manner in which the same are to be performed I declare that what I
claim is :-
Firstly. The construction of spherical chamber pumps and blowers with
chambers having flat instead of conical sides.
Secondly. Constructing discs with inclined faces to work in such chambers so
that the angle included between the inclined faces of the disc is equal to the
angle described by the disc's motion within the casing, the apex of such angular
faces being outside the disc's circumference.
Thirdly. The use of loose side rings or blocks inside the casing for taking up
the "back lash" or play, or compensation for wear, so as to keep the sides of
the casing in contact continually with the inclined faces of the disc and the
employment of springs or their equivalents for this purpose and also for that of
providing a bye-pass or safety valve for excessive pressure such mechanism being
adjustable whilst the machine is running.
Fourthly. For the purpose of driving my improved disc in a spherical casing
having flat or parallel sides, the employment of any suitable mechanical motion
which describes a cone having its apex in the centre of the disc.
Fifthly. The improved construction and general arrangement of disc pumps and
blowers substantially as described and illustrated by the drawing.
Dated this 30th day of October 1895.
ELIZABETH DAWSON,
Executrix of late Robert Joseph Dawson.
ELIZABETH DAWSON,
Executrix of late Robert Joseph Dawson.