An Improved Rotary Pump with Movable Rollers.
Year: 1890

page_text: Date of Application, 7th July, 1890
Complete Specification Left. 25th Mar., 1891-Accepted, 25th Apr., 1891
PROVISIONAL SPECIFICATION.
An Improved Rotary Pump with Movable Rollers.
A communication from AUGUSTE LAMBERT, of 7, Cours du Midi, Lyon, in the
Republic of France, Machine Builder.
I, ALFRED JULIUS BOULT, of 323, High Holborn, in the County of Middlesex,
M.I.M.E., do hereby declare the nature of this invention to be as follows:
--
The object of this invention is to construct an improved rotary pump with
movable rollers which consists of a hollow body of cylindrical shape forming the
main body of a pump in which revolves a disc forming the piston or plunger of the
pump. The diameter of this plunger is less than that of the body of the pump
while its thickness may be equal to or greater than the depth of such body. In the
latter case the body and cover of the pump are recessed so as to allow for the
excess of thickness of the disc. This disc or plunger is arranged eccentrically in
relation to the body of the pump, so as to come in contact with the circumference
of the latter at a point situated between the inlet and outlet openings. To render
this contact perfect the circumference of the body may be curved to the diameter
of the disc or plunger for the space or a part of it comprised between the openings.
The disc or plunger receives its rotary motion from a shaft passing through the
body of the pump. The disc is provided with two or more recesses which are
arranged symmetrically around the circumference, and are intended for the reception
of the rollers which may be of cylindrical or other suitable shape of a length equal
to the thickness of the piston or depth of the recesses and have sufficient amount of
play. These recesses may extend either over the whole or only through part of the
thickness of the disc. In the latter case, which in practice produces the most
favourable results, the sides or checks of such recesses may be integral with the disc
or plunger or formed separately by two circular plates or discs suitably attached to
either side of such disc. But whatever the mode of construction of these side pieces
may be, the body of the pump should be bored at both ends to a diameter and
depth such as will allow the cheeks to fit into them exactly, and to turn therein
during the rotary motion of the pump. The sides or cheeks are formed by special
plates or discs fitted to either side of the disc or plunger.
The
When rotary motion is imparted to the shaft the rollers will slide into the
recesses and come in contact with the circumference of the main body through the
combined effect of their own weight, centrifugal force, and the pressure of the liquid
thus forming a tight joint subject to a minimum of friction, and little wear.
suction takes place through one opening, the discharge through the other opening
when the shaft turns. These openings the position of which may vary according to
the special purpose the pump is intended to fulfil must however at all stages of the
operation of the pump be arranged in such a manner as to be separated from each
other on the one hand, by the point of contact (or contact surface) of the disc or
plunger with the main body, and on the other hand by at least one roller. The
number and size of these rollers as also the number, size, and shape of the recesses
are variable according to the requirements of the work. However the number of
rollers and of recesses should never be less than two, respectively.
In a form of pump provided with five rollers having plates on either side of the
disc or plunger, the said plates are embedded within suitable recesses provided in
the bottom or end walls of the main body.
T... 1890
W. P. THOMPSON & BOULT,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
An Improved Rotary Pump with Movable Rollers.
A communication from AUGUSTE LAMBERT, of 7, Cours du Midi, Lyon, in the
Republic of France, Machine Builder.
I, ALFRED JULIUS BOULT, of 323, High Holborn, in the County of Middlesex,
M.I.M.E., 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 :-
This invention which relates to an improved rotary pump will be best understood
by reference to the accompanying drawings in which
Fig. 1 is a vertical section and Fig. a horizontal section of a pump constructed
according to this invention.
Figs. and 4 are respectively an edge view or plan and a face view of the
revolving disc or plunger.
Like letters indicate like parts throughout the drawings.
The object of this invention is to construct an improved rotary pump with
movable rollers which consists of a hollow body A of cylindrical shape forming the
main body of a pump in which revolves a disc B forming the piston or plunger of
the pump.
The diameter of this plunger is less than that of the body of the pump
while its thickness is greater than the depth of such body. The body and cover of
the pump are recessed so as to allow for the excess of thickness of the disc. This
disc or plunger B is arranged eccentrically in relation to the body of the pump, so
as to come in contact with the circumference of the latter at a point situated
between the inlet C and outlet D. To render this contact perfect the circumference
of the body may be curved to the diameter of the disc or plunger for the space or a
part of it comprised between the openings. The disc or plunger B receives its
rotary motion from a shaft F passing through the body of the pump. The disc is
provided with two or more recesses E which are arranged symmetrically around the
circumference, and are intended for the reception of the rollers G which may be
of cylindrical or other suitable shape of a length equal to the depth of the recesses
and have sufficient amount of play. These recesses extend only through part of
the thickness of the disc their depth being equal to the depth of the body of the
pump. The sides or cheeks of the recesses may be integral with the disc or
plunger or formed separately by two circular plates or discs J suitably attached to
either side of such disc. But whatever the mode of construction of these side
pieces may be, the body and cover of the pump should be bored to a diameter and
depth such as will allow the cheeks to fit into them exactly and to turn therein
during the rotary motion of the pump. The fitting of the two side faces within
corresponding faces in the body of the pump renders the side joints between the
plunger and the body of the pump absolutely tight, and increases the sucking power
of the pump to a very considerable extent.
When rotary motion is imparted to the shaft F the rollers G will slide into the
recesses E and come in contact with the circumference of the main body A. through
the combined effect of their own weight, centrifugal force, and the pressure of the
liquid thus forming a tight joint subject to a minimum of friction, and little wear.
The suction takes place through one opening C, the discharge through the other
opening D when the shaft turns. These openings, the position of which may vary
according to the special purpose the pump is intended to fulfil, must however at all
stages of the operation of the pump be arranged in such a manner as to be separated
from each other on the one hand, by the point of contact (or contact surface) of the
disc or plunger B with the main body A, and on the other hand by at least one
roller G. The number and size of these rollers as also the number, size and
shape of the recesses are variable according to the requirements of the work.
However the number of rollers and of recesses should never be less than two,
respectively.

page_text: In the pump shown in the accompanying drawings which is provided with five
rollers G and plates on either side of the disc or plunger B, the said plates are
embedded within suitable recesses provided in the bottom or end walls of the main
body.
Having now particularly described and ascertained the nature of the said invention,
as communicated to me by my foreign correspondent, and in what manner the same
is to be performed, I declare that what I claim is :-
1. In a rotary pump the employment of a cylindrical piston or plunger eccen-
trically arranged within the body of the pump the thickness of which plunger is
greater than the depth of the body of the pump, its two side faces being located
within corresponding recesses in the sides of the body of the pump and its circum-
ference provided with recesses into which cylindrical or prismatic rollers are
adapted freely to enter, the length of such rollers being equal to the length of the
recesses and equal to the depth of the body of the pump whereby the suction and
discharge orifices of the pump are tightly closed through the combined action of
the weight of the said rollers of the pressure of the liquid and of centrifugal force
substantially as described and illustrated in the accompanying drawings.
2. The combination and arrangement of parts constituting the complete rotary
pump substantially as described and illustrated in the accompanying drawings.
Dated this 25th day of March 1891.
W. P. THOMPSON & BOULT,
Agents for the Applicant.