Improvements in Rotary Motors or Pumps.
Year: 1890

page_text: Date of Application, 14th May, 1890
Complete Specification Left, 6th Feb., 1891-Accepted, 14th Mar., 1891
PROVISIONAL SPECIFICATION.
Improvements in Rotary Motors or Pumps.
A communication from abroad by CAMILLE BORNET of 19, Rue Faraday, Paris,
in the Republic of France, Engineer.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for
Foreign Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street,
Manchester, both in the County of Lancaster, and 323, High Holborn, in the
County of Middlesex, Civil Engineer, do hereby declare the nature of this inven-
tion to be as follows:-
The object of this invention is a rotary motor which can be driven by any
suitable fluid under pressure, such as water, steam, compressed air, etcetera, and
which is applicable to numerous industrial purposes and particularly for the direct
driving of certain tools or special apparatus such as hoists or boring machines for
mines, etcetera, etcetera.
The machine is composed essentially of a cylinder of circular section, divided
into two approximately equal compartments by a partition, its two extremities
being closed by covers.
On an axle, which passes through the cylinder eccentrically to it, are fitted
two similar pistons situated respectively in each of the compartments of the machine
and placed on the axle at right angles to each other. The exterior form of the
pistons is determined by two arcs of a circle of a radius approximately equal to that
of the interior of the cylinder, so that, when the greatest length of a piston is placed
in the direction of the minimum chord passing through the centre of the axle,
the whole interior of the cylinder situated above this chord is filled by the
piston.
The pistons are adapted to slide longitudinally on blocks or guides keyed on the
axle to which they thus transmit the revolving motion that they receive from the
motive fluid. The ends of the pistons are furnished with grooves in which are
lodged sliding strips, which suitable springs tend constantly to press towards the
internal walls of the cylinder in order to form a tight joint at these places. It will
be easily understood that, the axis of the machine being eccentric, the length of the
pistons must vary according as their position corresponds to the minimum or maximum
chord of this cylinder.
Each strip is preferably fitted with a jointed slide, the contact face of which is
bored cylindrically to the diameter of the cylinder in order to assure the hermetical
tightness of the joint; any other equivalent packing arrangement can be employed
for the same purpose.
The motive fluid is supplied from any suitable source and, after passing by a four
way cock or valve, traverses a circumferential passage made in the external wall of
the apparatus and enters the interior of the cylinder by an opening or port; then
the fluid, after having acted on the piston so as to turn it about half a revolution,
flows out by the exhaust opening at the opposite side of the cylinder channel into a
circumferential passage similar to the first named, and finally traverses the other
passage of the four way cock and flows away to the outside by a suitable pipe.
It is to be understood that the cylinder being divided into two compartments by
the partitions, the feed and exhaust ports must exist in duplicate.
It is also to be understood that, according to the position given to the four way
valve, all passage of the motive fluid can be interrupted at will, or it may be forced
to travel in either direction, thus changing the direction of the movement of the
machine.

page_text: Wide openings are formed in the blocks or guides of the pistons to prevent the
air contained in the interior of the same from offering resistance to their longitudinal
displacement.
The sliding strips of the pistons are furnished with lateral flanges, the height of
which is calculated in such a way that, striking against the bottom of the grooves
in which they rest, they relieve the springs from the direct pressure of the fluid on
the jointed slides at the moment of their passage before the entrance ports above
named.
In order to insure the perfect lubrication of all the parts of the machine, passages
are bored in the material of the walls, by means of which the lubricating substance,
contained in a lubricator, can have free access to all the moving parts of the
machine.
Suitable packing may be used on the ends of the pistons in cases where it is
deemed necessary.
When the motive fluid used for driving the machine is an elastic fluid, such as
steam for instance, it may be of advantage to utilise the expansion of this fluid; to
attain this result it suffices to fix the partition in such a way that it divides the
cylinder into two unequal compartments, and to make use of a system of distribution
which allows of introducing the compressed fluid first into the smaller of the two
compartments of the apparatus, and then into the larger compartment, where the
expansion then takes place.
Finally, it is evident, that, like most machines of this class, the apparatus, if
desired, can be used as a pump by the application of a suitable motive force to the
axle which carries the rotary pistons.
Dated this 13th day of May 1890
WM. P. THOMPSON & Co.,
Agents for the Applicant.
Improvements in Rotary Motors or Pumps.
A communication from abroad by CAMILLE BORNET, of 19, Rue Faraday, Paris,
in the Republic of France, Engineer.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for
Foreign Patent Solicitors, 6, Lord Street, Liverpool, & 6, Bank Street, Manchester,
both in the County of Lancaster, & 323, High Holborn, in the County of Middlesex,
Civil 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 :-
The object of this invention is a rotary motor which can be driven by any
suitable fluid under pressure, such as water, steam, compressed air, etcetera, and
which is applicable to numerous industrial purposes and particularly for the direct
driving of certain tools or special apparatus, such as hoists or boring machines for
mines, etcetera, etcetera.
On the accompanying drawings:-
Figure 1 is a transverse vertical section of the machine, and
Figure 2 is a longitudinal section of the same.
The machine is composed essentially of a cylinder A of circular section, divided
into two approximately equal compartments by a partition B, its two extremities
being closed by covers C.
On an axle D, which passes through the cylinder eccentrically to it, are fitted
two similar pistons E situated respectively in each of the compartments of the
machine and placed on the axle at right angles to each other. The exterior form
of the pistons is determined by joining two arcs of a circle of a radius approximately
equal to that of the interior of the cylinder A, so that, when the greatest length of
a piston is placed in the direction of the minimum chord passing through the centre

page_text: of the axle D, the whole interior of the cylinder situated above this chord. is filled
by the piston, as shown in Figure 1 of the drawings.
The pistons E are adapted to slide longitudinally on blocks or guides F keyed
on the axle D to which they thus transmit the revolving motion that they receive
from the motive fluid. The ends of the pistons E are furnished with grooves in
which are lodged sliding strips G, which suitable springs H tend constantly to
press towards the internal walls of the cylinder A, in order to form a tight joint at
these places. It will be easily understood that, the axis D of the machine being
eccentric, the length of the pistons must vary according as their position corre-
sponds to the minimum chord a c, Figure 1, or maximum chord y y of the cylinder,
as shown by the dotted lines.
Each strip G is preferably fitted with a jointed slide I, the contact face of which
is bored cylindrically to the diameter of the cylinder A, in order to assure the
hermetical tightness of the joint; any other equivalent packing arrangement can be
employed for the same purpose.
As shown in Figures 1 and 2, the motive fluid is supplied by the pipe j or from
any suitable source, and, after passing by a four way cock or valve K, traverses a
circumferential passage L made in the external wall of the apparatus and enters
the interior of the cylinder A by an opening or port M; then the fluid, after
having acted on the piston E so as to turn it about half a revolution, flows out by
the exhaust opening M at the opposite side of the cylinder channel into a
circumferential passage L' similar to the first named, and finally traverses the
other passage of the four way cock K and flows away to the outside by a suitable
pipe N.
It is to be understood that the cylinder A being divided into two compartments
by the partitions B, the feed and exhaust ports M M¹ must exist in duplicate on
each side of the machine, as shown in dotted lines on Figure 2 of the drawings..
It is also to be understood that, as shown in Figure 1, according to the position
given to the four way valve K, all passage of the motive fluid can be interrupted
at will, or it may be forced to travel in either direction by the passage L or L',
thus changing the direction of the movement of the machine.
Wide openings O are formed in the blocks or guides F of the pistons to prevent
the air contained in the interior of the same from offering resistance to their longi-
tudinal displacement.
The sliding strips G of the pistons are, as shown, (Figure 2) furnished with
lateral flanges, the height of which is calculated in such a way that, striking
against the bottom of the grooves in which they rest, they relieve the springs H
from the direct pressure of the fluid on the jointed slides I at the moment of their
passage before the entrance ports M M' above named.
In order to insure the perfect lubrication of all the parts of the machine,
passages P P P are bored in the material of the walls, by means of which the
lubricating substance, contained in a lubricator placed at Q, can have free access
to all the moving parts of the machine.
Suitable packing may be used on the ends of the pistons in cases where it is
deemed necessary.
When the motive fluid used for driving the machine is an elastic fluid, such
as steam or compressed air, for instance, it may be of advantage to utilise the
expansion of this fluid; to attain this result it suffices to fix the partition B in
such a way that it divides the cylinder A into two unequal compartments, and
to make use of a system of distribution which allows of introducing the com-
pressed fluid, first into the smaller of the two compartments of the apparatus,
and then into the larger compartment; where the expansion then takes place.
It is evident that, like most machines of this class, the apparatus, if desired, can
be used as a pump by the application of a suitable motive force to the axle which
carries the rotary pistons.
It is also evident that the cylinder of the machine could be composed of a single
compartment and only contain a single piston, similar to that described above, but,

page_text: in this case, the shaft must have a fly wheel for the purpose of carrying it over the
dead points.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is :-
1. In a rotary motor, a cylinder divided into two equal or unequal compartments.
in combination with two revolving pistons, in the shape of two coupled arcs of a
circle, placed at right angles to one another, and each capable of sliding over a
slide block fixed on the eccentric axle of the motor, substantially as described.
2. In a rotary motor, in combination with a cylinder divided into two compart-
ments and containing two revolving eccentric pistons of oval shape, an inlet device
comprising a two way cock, whereby the apparatus may be caused to work in either
direction, substantially as described.
3. A rotary motor comprising a circular cylinder A divided into two compart-
ments, an eccentric axle D, two oval pistons E placed at right angles to one
another and sliding on the blocks F keyed on the axle, the spring strips G allowing
automatic variations in the length of the pistons, the passages of communication Ŏ
on both sides of the interior space of the pistons, the double channels M and M' for
the inlet and outlet of the motive fluid, the four way cock K regulating the flow of
this fluid and the channels P for the lubrication of the movable parts of the motor;
the whole combined and arranged substantially as described.
Dated this 4th day of February 1891.
WM. P. THOMPSON & Co.,
Agents for the Applicant.