IMPROVEMENTS IN ROTARY PUMPS, SPECIALLY APPLICABLE AS GAS EXHAUSTERS
Year: 1880

page_text: LETTERS PATENT to George Waller, of Holland Street, Southwark, in the
County of Surrey, for an Invention of "IMPROVEMENTS IN ROTARY PUMPS,
SPECIALLY APPLICABLE AS GAS EXHAUSTERS."
PROVISIONAL SPECIFICATION left by the said George Waller at the Office
of the Commissioners of Patents on the 28th December 1880.
GEORGE WALLER, of Holland Street, Southwark, in the County of Surrey.
"IMPROVEMENTS IN ROTARY PUMPS, SPECIALLY APPLICABLE AS GAS EXHAUSTERS.'
This Invention has for its object the construction of apparatus for drawing or
forcing gas or other fluids in such a manner as to allow of greater speed, a more
regular flow of fluid, and a reduction in wear and tear in comparison with the
apparatus generally in use.
The Invention consists of a cast iron cylinder bored and fitted with ends or
covers, and having inlet and outlet ports. Within this cylinder is a large cylindrical
roller which when intended for large sized exhausters or pumps is open at both
ends to allow of a hollow pin passing through it and the centre of the cylinder
covers. This roller has two or more, but by preference three, longitudinal holes
bored to receive slotted rollers. Two, three, or more slides are attached to the
central hollow pin and pass through the slots in the rollers aforesaid, each of the
slides being fitted with tongue pieces round three of their edges in order to keep
them fluid tight when in motion. The pin aforesaid is made hollow in order to
admit of oil being supplied to the interior to lubricate the moving parts. One end
of the large roller has a ring with teeth upon its periphery like an ordinary cogged
wheel or pinion. Above the cylinder first alluded to there is a chamber connected
therewith in which revolves a spur wheel that gears into the teeth of the toothed
ring on the end of the roller. This spur wheel is keyed to a shaft working in
suitable bearings, and one end of the said shaft is connected with motive power.
For exhausters or pumps of small dimensions the roller may be made to rotate
within the cylinder by a shaft fixed to the centre of the said roller, but in this
case the hollow pin will be fixed to one of the cylinder covers, and at one end
only, though carrying the slides in the same manner as before described for the
larger sizes.
Upon motion being given to the driving shaft the roller and slides will be made
to revolve, and being cocentric to the cylinder in which they work will cause the
gas to be drawn in from the inlet and expelled at the outlet in a more continuous
flow than has hitherto generally been the case.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said George Waller in the Great Seal Patent Office on the 28th June
1881.
"
GEORGE WALLER, of Holland Street, Southwark, in the County of Surrey.
IMPROVEMENTS IN ROTARY PUMPS SPECIALLY APPLICABLE AS GAS EXHAUSTERS."
This Invention has for its object the construction of apparatus for drawing or
forcing gas or other fluids in such a manner as to allow of greater speed, a more
regular flow of fluid, and a reduction in wear and tear, in comparison with the
apparatus generally in use.
The Invention consists of a cast iron cylinder bored and fitted with ends or
covers, and having inlet and outlet ports. Within this cylinder is a large cylin-
drical roller which when intended for large sized exhausters or pumps is open at
both ends, to allow of a hollow-pin passing through it and the centre of the
cylinder's covers. This roller has two or more, but by preference three, longitudinal
holes bored to receive slotted rollers. Two, three, or more slides are attached to
the central hollow pin, and pass through the slots in the rollers aforesaid, each of
the slides being fitted with tongue pieces round three of their edges, in order to
keep them fluid tight when in motion. The pin aforesaid is made hollow in order
to admit of oil being supplied to the interior to lubricate the moving parts. One
end of the large roller has a ring with teeth upon its periphery like an ordinary
cogged wheel or pinion. Above the cylinder first alluded to there is a chamber
connected therewith in which revolves a spur wheel that gears into the teeth of
the toothed ring on the end of the roller. This spur wheel is keyed to a shaft
working in suitable bearings, and one end of the said shaft is connected with
motive power.
For exhausters or pumps of small dimensions the roller may be made to rotate
within the cylinder by a shaft fixed to the centre of the said roller, but in this case
the hollow pin will be fixed to one of the cylinder covers, and at one end only,
though carrying the slides in the same manner as before described for the larger
sizes.
In order that the foregoing may be more easily understood Drawings are
attached hereto, of which the following is a description:-Fig. 1 is a transverse
sectional elevation of the exhauster; Fig. 2 is a longitudinal sectional elevation of
the same; Fig. 3 is an elevation of one of the slotted rollers F, and Fig. 4, a
transverse section of the same roller; Fig. 5 is a longitudinal section of the hollow-
pin H; Fig. 6 is a plan of one of the slides, and Fig. 7 is a transverse section, and
Fig. 8, a longitudinal section of the same; Fig. 9 is a modification of Figs. 1
and 2, suitable for small exhausters. In Figs. 1 and 2 A is the cast iron cylinder
with its covers B, B, C being the inlet and D the outlet port; E is the cylindrical
roller, bored longitudinally at three points to admit of the reception of three slotted
rollers F, F, F, which are not necessarily but preferably made of steel; G, G, G, are
the slides, which are attached or hinged to the hollow steel pin H, and pass
through the slotted rollers, being fitted with tongue pieces, as seen at I, I, I, in
Figs. 6, 7, and 8. The hollow-pin H is open at one end to admit of the
insertion of an oil injector, and has a number of holes J to correspond with the
divisions of the hinges, and so allow of their being lubricated. K is the ring
having teeth on its periphery, and is keyed or cast on to the roller E, and L is the
enclosed spur wheel into which it gears, and by which it is driven when motion is
imparted to the shaft N, one end of which projects through the casing at O, and at
or near there may have attached to it an ordinary driving pulley. In Fig. 9 the
cylindrical roller E has a central driving shaft P fixed to it, the hollow pin H being
fixed at one end only to the cylinder cover B.

page_text: It is obvious that other arrangements for driving the roller E and blades G may
be devised to suit particular circumstances.
Upon motion being given to the driving shaft the roller E and slides G will be
made to revolve, and being eccentric to the cylinder in which they work will cause
the gas to be drawn in from the inlet and expelled from the outlet in a more
continuous flow than has hitherto generally been the case.
Having now described and particularly set forth the nature of this Invention,
and the manner in which the same is or may be used or carried into effect, I would
observe in conclusion that I do not confine or restrict myself to the precise details
or arrangements that I have described or referred to, as variations may be made
therefrom without deviating from the principles or main features of this Invention,
but what I consider to be novel and original, and therefore claim as the Invention
secured to me by the hereinbefore in part recited Letters Patent is,-
Firstly. The central hollow-pin for the slides or blades to rotate upon, as herein
described and shown on the Drawings.
Secondly. The steel slotted rollers F fitted into the periphery of the driving
roller E, and arranged to suit the varying positions of the slides or blades, as herein
described and shown on the Drawings.
Thirdly. The means for driving the roller E from its outer diameter, namely,
by a toothed ring K and spur wheel L, as herein described and shown on the
Drawings.
In witness whereof, I, the said George Waller, have hereunto set my hand and
seal, this Twenty seventh day of June, in the year of our Lord One
thousand eight hundred and eighty one.
GEORGE WALLER. (L.S.)