ROTARY PUMPA, APPLICABLE of "IMPROVEMENTS ALBO AS FLUID METERS
Year: 1872

page_text: LETTERS PATENT to Robert Carey, of No. 5, Radcliffe Villas, Shake-
speare Road, Brixton, in the County of Surrey, for the Invention
IN ROTARY PUMPA, APPLICABLE
of "IMPROVEMENTS
ALBO AS FLUID
METERS."
Sealed the 12th November 1872, and dated the 4th June 1872.
PROVISIONAL SPECIFICATION left by the said Robert Carey at the
Office of the Commissioners of Patents, with his Petition, on the
4th June 1872.
I, ROBERT CAREY, of No. 5, Radcliffe Villas, Shakespeare Road,
Brixton, in the County of Surrey, do hereby declare the nature of the
said Invention for "IMPROVEMENTS IN ROTARY PUMPS, APPLICABLE ALSO A8
FLUID METERS," to be as follows:-
This Invention has more especially for its object to simplify the con-
struction of rotary pumps for exhausting gas retorts or for pumping air
for ventilating and other purposes.
I construct a rotary pump of a cylinder having an inlet passage and
an outlet passage branching out from it. The cover of one end of the

page_text: cylinder carries a central pin which forms an axis for three or it might
be other number of radial flaps to turn around freely.
These flaps
extend from the central pin to the circumference of the cylinder, and
work fluid tight or nearly so against the circumference and the end
covers of the cylinder. In the cover of the opposite end of the cylinder
is a circular recess eccentric to the cylinder; in this recess is a disc
having a number of equidistant radial grooves cut in its face, one for
each flap. Projecting from each flap is a pin carrying a friction roller
or sliding block to enter one of these grooves. The disc is carried by
an axis passing out through a stuffing box in the end cover. When the
apparatus is to be used as a pump this axis is revolved continuously, and
the flaps are thereby caused to turn round upon the central pin to which
they are pivoted, but with an intermittent motion as the rollers or blocks
carried by the flaps will at one time be near to the centre of the revolving
disc, and will be moved slowly, whilst at other times they will be near
to the circumference of the disc, and will then be moved quickly. The
flaps are by this means caused to sweep quickly around the greater part
of the circumference of the cylinder, whilst they move but slowly past
the remaining portion of the circumference.
The inlet passage is
situated on one side of this portion of the circumference, whilst the
outlet passage is on its other side, and they are at such a distance apart
that there shall always be one or other of the flaps at rest, or nearly so,
between the inlet and outlet passages.
If the apparatus is to be used as a meter a counting apparatus is
applied to the axis of the disc to record the number of its revolutions.
I prefer that each flap should carry a filling block by which the space

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourth day of June, in the year of
our Lord One thousand eight hundred and seventy-two, in the thirty-
fifth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Robert Carey, Her special license that I,
the said Robert Carey, my executors, administrators, and assigns, or
such others as I, the said Robert Carey, my executors, administrators,
and assigns, should at any time agree with, and no others, from time
to time and at all times thereafter during the term therein expressed,
should and lawfully might make, use, exercise, and vend, within the
United Kingdom of Great Britain and Ireland, the Channel Islands,
and Isle of Man, an Invention for "IMPROVEMENTS IN ROTARY PUMPS,
APPLICABLE ALSO AS FLUID METERS," upon the condition (amongst others)
that I, the said Robert Carey, my executors or administrators, by an
instrument in writing under my, or their, or one of their hands and
seals, should particularly describe and ascertain the nature of the said
Invention, and in what manner the same was to be performed, and
cause the same to be filed in the Great Seal Patent Office within six
calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said Robert Carey, do hereby declare
the nature of the said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say:-
This Invention has more especially for its object to simplify the
construction of rotary pumps for exhausting gas retorts or for pumping
air for ventilating and other purposes.
I construct a rotary pump of a cylinder having an inlet passage and
an outlet passage branching out from it. The cover of one end of the
cylinder carries a central pin which forms an axis for three or it might
be other number of radial flaps to turn around freely. These flaps extend
from the central pin to the circumference of the cylinder and work fluid
tight or nearly so against the circumference and the end covers of the
cylinder. In the cover of the opposite end of the cylinder is a circular
recess eccentric to the cylinder; in this recess is a disc having a number
of equidistant radial grooves cut in its face, one for each flap. Pro-
jecting from each flap is a pin carrying a friction roller or sliding block
to enter one of these grooves. The disc is carried by an axis passing

page_text: The
out through a stuffing box in the end cover. When the apparatus is
to be used as a pump this axis is revolved continuously and the flaps
are thereby caused to turn round upon the central pin to which they
are pivoted, but with an intermittent motion as the rollers or blocks
carried by the flaps will at one time be near to the centre of the revolving
dise and will be moved slowly, whilst at other times they will be near
to the circumference of the disc and will then be moved quickly.
flaps are by this means caused to sweep quickly around the greater
part of the circumference of the cylinder whilst they move but slowly
past the remaining portion of the circumference.
The inlet passage is
situated on one side of this portion of the circumference whilst the
outlet passage is on its other side, and they are at such a distance apart
that there shall always be one or other of the flaps at rest or nearly
so between the inlet and outlet passages.
If the apparatus is to be used as a meter a counting apparatus is
applied to the axis of the disc to record the number of its revolutions.
I prefer that each flap should carry or form a filling block by which
the space between two flaps when thus at rest or nearly so, and in their
nearest position to one another, should approximately be filled up.
And in order that my Invention may be fully understood and readily
carried into effect, I will proceed to describe the Drawings hereunto
annexed.
DESCRIPTION OF THE DRAWINGS.
At Figure 1 of the Drawings is shewn a transverse section, and at
Figure 2 a longitudinal section of a rotary pump constructed as above
described; Figure 3 shews an end view, and Figure 4 a plan of the
same.
In these Figures a is the cylinder formed with inlet and outlet
passages b, c, d are the cylinder covers, one of which carries the axis e,
upon which revolve the flaps f. The manner in which these flaps are
hinged around the axis e is shewn at Figure 6. The other cylinder
cover has formed in it the circular recess 9, in which is received the
disc h, shewn separately at Figure 5. The disc his carried by the
axis, this axis turns in bearings cast with the cylinder cover, and
also passes through the stuffing box m; n, n, are three radial grooves in a
the face of the disc h; in each groove is a sliding block o, as shewn in
Figures 1 and 2. These blocks have each a hole formed in them, into

page_text: which enters one of the pins p projecting from the end of each radial
flap f. When the axis is caused to revolve, which may be effected in
any suitable manner, the flaps f are carried round with it, but as before
explained with an intermittent motion, there being always one or other
of the flaps at rest or nearly so, and as shewn by the Drawing they thus
come to rest in between the inlet and outlet passages b.
In place of the disc h having radial grooves formed in it to receive
pins upon the radial flaps, the pins might be carried by the disc and
enter grooves in the ends of the flaps.
As before stated the apparatus can also be used as a fluid meter; in
this case a counting apparatus is applied to the axis k to record the
number of its revolutions.
Having thus described the nature of my Invention, and the manner
of performing the same, I would have it understood that what I claim
as my improvements in rotary pumps applicable also as fluid meters is,
the combination of apparatus substantially as herein described.
In witness whereof, I, the said Robert Carey, have hereunto set
my hand and seal, this Third day of December, in the year of
our Lord One thousand eight hundred and seventy-two.
ROBT. CAREY. (L.S.)