Improvements in Expansive Rotary Steam Engines.
Year: 1889

page_text: Date of Application, 11th June, 1889
Complete Specification Left, 11th Mar., 1890-Accepted, 12th Apr., 1890
PROVISIONAL SPECIFICATION.
Improvements in Expansive Rotary Steam Engines.
I, Henry BleasDALE of 52 Seymour Road, Astley Bridge near Bolton in the
County of Lancaster, Agent, do hereby declare the nature of my said invention to
be as follows :-
This invention relates to improvements in expansive rotary steam engines and
consists in mounting in a suitable casing or framing a disc or its equivalent with
slots fitted with slide valves. The disc or its equivalent is mounted on a steam
pipe or hollow shaft with openings to conduct steam into a chamber or cavity in
the said disc or its equivalent. The disc or its equivalent is also provided with
passages leading from the chamber or cavity to the slide valves. These passages
can be if desired-fitted with "Corliss" valves operated by suitable mechanism to
admit steam at the correct point or time and prevent back-pressure. The slide valves
are constructed with steam ports of such an area as to ensure of the outer ends of
the same being pressed tightly against the working face of the casing or framing.
The inside or working face of the latter is constructed in eccentric or cam like forms
to push the slide valves into their respective slots as the disc or its equivalent
revolves, by which action steam is cut off as many times in a revolution as there are
eccentric or can like working surfaces. Suitable exhaust ports are provided leading into
a chamber or cavity, from whence the exhaust steam is conveyed away by a pipe to
any desired point. Immediately the slide valves pass the exhaust ports they are
automatically pressed outwardly by the action of steam from the centre chamber or
cavity, at which point they present the greatest area to the full pressure of steam.
When a number of slide valves are employed it will be seen that several of the valves
will be under the operation or action of steam, while others are in the act of exhausting
or otherwise, thereby ensuring of a steady uniform speed provided the pressure of
steam is constant. The joints between the casing or framing and the revolving disc
or its equivalent and valves are made by any of the well known methods.
Dated the 10th June 1889.
EDMUND CHADWICK,
A cent
COMPLETE SPECIFICATION.
Improvements in Expansive Rotary Steam Engines.
I, HENRY BLEASDALE of 52 Seymour Road, Astley Bridge near Bolton in the
County of Lancaster, Agent, do hereby declare the nature of my said 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 relates to improvements in expansive rotary steam engines and con-
sists in mounting in a suitable casing or framing a disc or its equivalent with slots
fitted with slide valves. The disc or its equivalent is mounted on a steam pipe or
hollow shaft with openings to conduct steam into a chamber or cavity in the said disc
or its equivalent. The disc or its equivalent is also provided with passages leading
from the chamber or cavity to the slide valves. The slide valves are constructed
with steam ports of such an area as to ensure of the outer ends of the same being
pressed tightly against the working face of the casing or framing. The inside or
working face of the latter is constructed in eccentric or cam like forms to push the
slide valves into their respective slots as the disc or its equivalent revolves, by which
action steam is cut off as many times in a revolution as there are eccentric or cam
like working surfaces. Suitable exhaust ports are provided leading into a chamber

page_text: or cavity, from whence the exhaust steam is conveyed away by a pipe to any desired
point. Immediately the slide valves pass the exhaust ports they are automatically
pressed outwardly by the action of steam from the centre chamber or cavity, at which
point they present the greatest area to the full pressure of steam. When a number of
slide valves are employed it will be seen that several of the valves will be under the
operation or action of steam, while others are in the act of exhausting or otherwise,
thereby ensuring of a steady uniform speed provided the pressure of steam is constant.
The joints between the casing or framing and the revolving disc or its equivalent
and valves are made by any of the well known methods.
Fig. 1 is a sectional side elevation of my improved expansive rotary steam engine-
Fig. 2 is a sectional elevation through line A' B¹ in Fig. 1-Fig. 3 is a front
view of the slide valves--Fig. 4 is a back view of same, and Fig. 5 is a longitudinal
elevation of my improved expansive rotary steam engine mounted on a frame and
provided with a fly wheel or driving pulley.
A is a casing or framing in which is mounted the disc B provided with the slots C
to receive the slide valves D¹ to D' inclusive. The disc B is mounted on the steam
pipe or hollow shaft E with the openings G to convey steam.into the chamber or
cavity H in the disc B. The latter is also provided with the passages I leading from
the chamber or cavity H to the slide valves D' to D. The disc B is fitted with the
loose plate or disc O secured by the set screws P to admit of the same being
mounted in the casing or framing A. The slide valves are constructed with the
ports J. The inside of the casing or framing A is constructed with the eccentric or
cam like working surfaces K to operate the slide valves D¹ to D' in their respective
slots as the disc B rotates in the direction indicated by the arrow. The casing or
framing A is secured in position and fixed in the outer casing N by the keys B².
The casing or framing A is provided with the exhaust ports L leading into the exhaust
chamber M between the outside of the casing or framing A and the inside of the
casing N. After the casing or framing A and the disc B have been placed in position
in the casing N they are secured by the discs R and S and the bolts T. The disc S
is fitted with the stuffing box U to prevent the escape of steam in case the joint V
leaks. The outside of the disc B is grooved and filled with asbestos rings V₁ or
other equivalents to make a steam tight joint between the disc B and plate O and
the discs R and S. The steam pipe or hollow shaft E is mounted in the bearings X
and X on the bed-plate Y. The bearing X' is fitted with the steam box Z, from
whence steam is admitted to the hollow shaft E, being supplied to the box Z by the
steam pipe C leading from the boiler. The shaft E is fitted with the fly-wheel or
pulley E from whence machinery can be driven by strap or belt. If desired the
rim or periphery of the fly-wheel or pulley E' can be grooved for ropes, or substituted
by spur gear as desired.
This invention operates in the following manner :-Steam is conveyed from the
boiler into the hollow shaft E, from whence it passes through the openings G into
the chamber or cavity H and passages I to the slide valves D¹ to D'. As the disc B
rotates the outer ends of the valves are pressed tightly against the eccentric or cam
like working surfaces K by the action of steam. When the valves pass the points S¹
they are at once blown outwardly by the pressure of steam as indicated by valve D',
which is full open for steaming. As the disc B rotates the valves are moved inwardly
by their movement or traverse on the eccentric or cam like working surfaces K until
the position indicated by valve D³ is attained, at which point steam is cut off, the
remaining portion of the travel of this valve on the surface K being effected by
expansion of the steam. When the steam side of the slide valves pass the exhaust
ports L the steam in the spaces between the points S₁ and the exhaust ports L passes
into the chamber M and away through the pipe M¹ into the atmosphere, or to any
suitable condensing apparatus. This rotary expansive engine can be fitted with any
suitable governor for the purpose of automatically regulating speed.
I would have it understood that I do not confine myself to the number of eccentric
or cam like working surfaces and slide valves shown on the drawings, as the same
can be fitted with any desired number according to the size and power required.
G

page_text: Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. In a rotary steam engine the use of the casing or framing A with the eccentric
or cam like working surfaces K for the purpose of operating the valves so as to work
steam expansively, substantially as described and as shown on the drawings.
2. In a rotary steam engine the use of the slide valves provided with the steam
port J, substantially as described and shown for the purpose specified.
3. In a rotary steam engine the combination of the disc B, hollow shaft E with
the openings G, chamber or cavity E, passages I, slide valves with the ports J sliding
to and fro in the slots C, the casing or framing A with the eccentric or cam like
working surfaces K and the exhaust ports L, the casing N, and the discs R and S,
applied and operating substantially as described and as shown on the drawings.
4. The general construction, combination, and arrangement of parts forming my
improved expansive rotary steam engine, substantially as described and as shown on
the drawings.
T1 1900
EDMUND CHADWICK,
Agent.