Year: 1887

page_text: Date of Application, 26th May, 1887
Complete Left, 23rd Feb., 1888
Complete Accepted, 13th Apr., 1888
I THOMAS TREVARTHAN KEMP of Temple Cloud Bristol in the County of Somerset
Mining Foreman, do hereby declare the nature of this invention to be as follows:-
This invention relates to apparatus for use as a motive power engine (or pump,
with the necessary modification of the valves) driven by steam or other fluid.
The apparatus consists of an annular piston chamber having for its centre a rotating
disc caused to rotate by a central axis keyed thereto, and this disc has keyed to it
and projecting from it across the annular space a plate forming a piston. This piston
is packed to the side walls and circumferential wall of the annular chamber by means
of packing pieces kept pressed outwards by spring pressure.
An abutment for the pressure of the steam or motive fluid to be exercised against
in rotating this plate and disc is formed by a sliding plate suitably guided by guide
ways and operated by a suitable lever jointed thereto contained in a suitable steam
tight chest, carried by an axis and timed in its operation to form a closing wall
across the annular space except when in the revolution of the circularly travelling
piston plate that plate comes near to and requires to pass that abutment, then that
sliding abutment is withdrawn to permit the piston to pass and is replaced behind
it instantly by an eccentric or equivalent motion.
The steam or motive fluid to operate the engine enters through a suitable check
valve adapted to prevent a waste of steam during the time that the sliding abutment
is withdrawn and whilst the piston is passing it and to enable the engine to be
worked at any desired degree of expansion. This check valve is operated by
eccentric from the main central axis and the sliding abutment lever is also similarly
operated by a roller applied on a lifting lever being actuated by an eccentric on the
main shaft and this lever is connected by an adjustable link or connecting rod to
an arm carried by the axis of the lever operating the sliding abutment, or equivalent
connections may be used.

page_text: The piston having passed the point where the abutment has been withdrawn that
abutment drops into place again and the check valve being opened steam is again
introduced.
The steam entering from the check valve passes into a steam chest containing
the slide valve which controls the passage of the steam to one or other of two parts
communicating with the annular chamber, and through the slide valve to the exhaust
port.
The direction in which the piston at starting will be driven will depend on the
direction of motion given to a directing valve lever operating the stopping starting
and reversing valve gear.
WM. BROOKES & SON,
55 & 56, Chancery Lane, London,
Agents for the Applicant.

page_text: CUMI LEIE DE MUITIVATION.
Improved Rotary Steam or Fluid Engine or Pump.
1. THOMAS TREVARTHAN KEMP of Temple Cloud, Bristol in the County of Somerset,
Mining Foreman 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 relates to apparatus for use as a motive power engine (or pump
with the necessary modification of the valves) driven by steam or other fluid.
The apparatus consists of an annular piston chamber having for its centre a
rotating disc caused to rotate by a central axis keyed thereto and this disc has keyed
to it and projecting from it across the annular space a plate forming a piston.
This piston is packed to the side walls and circumferential wall of the annular
chamber by means of packing pieces kept pressed outwards by spring pressure.
An abutment for the pressure of the steam or motive fluid to be exercised against
in rotating this plate and disc is formed by a sliding plate suitably guided by guide-
ways and operated by a suitable lever jointed thereto contained in a suitable
steam tight chest, carried by an axis and timed in its operation to form a closing
wall across the annular space except when in the revolution of the circularly travelling
piston plate that plate comes near to and requires to pass that abutment, then that
sliding abutment is withdrawn to permit the piston to pass and is replaced behind
it instantly by an eccentric or equivalent motion.
The steam or motive fluid to operate the engine enters through a suitable check
valve adapted to prevent a waste of steam during the time that the sliding abutment
is withdrawn and whilst the piston is passing it and to enable the engine to be
worked at any desired degree of expansion.
This check valve is operated by eccentric from the main central axis and the sliding
abutment lever is also similarly operated by a roller applied on a lifting lever being
actuated by an eccentric on the main shaft and this lever is connected by an adjustable
link or connecting rod to an arm carried by the axis of the lever operating the
sliding abutment, or equivalent connections may be used.
The piston having passed the point where the abutment has been withdrawn that
abutment drops into place again and the check valve being opened steam is again
introduced.
The steam entering from the check valve passes into a steam chest containing the
slide valve which controls the passage of the steam to one or other of two ports
communicating with the annular chamber, and through the slide valve to the exhaust
port.
The direction in which the piston at starting will be driven will depend on the
direction of motion given to a directing valve lever operating the stopping starting
and reversing valve gear.

page_text: DESCRIPTION OF THE DRAWINGS.
Like letters denote like parts in each of the Figures.
a
Figure I. is a cross section of the engine according to one arrangement of the
invention a is the main shaft a¹ solid keys forged on said shaft; ca disc held in
place on the shaft a by these keys; d is a plate forming the piston preferably cast
with the disc c d a packing piece, g the chamber in which the piston d revolves,
f steam ports, the sliding abutment, packing piece in the slide h, h² a box or
distance piece into which the slide h is withdrawn for the passage of the piston d,
3 a head or cover with a stuffing box for packing the slide rod h, a packing gland,
7 the piston rod, connected to the piston 6, working in cylinder r, h the stuffing
box for packing the piston rod 5, a head with a junction and a stopper ³ for
purposes of lubricating is a lever, one end of which works in box 8 which box is
forged or connected to the end of the piston rod the other end of the lever / is
keyed to the shaft k, which works in bushes in the bracket 1, the cylinder or outer
wall of the chamber g, the bracket is bolted to the cylinder. Lugs are cast on the
cylinder gl for bolting same to the bed A, ja hand wheel fixed to the spindle which
actuates the starting and stopping valve j, j is a bracket for the support of the
spindle to which the hand wheel j¹ is attached.
Figure II is a longitudinal section of Fig. I the plate d forming the piston is not
shown in this section, but the disc c is shown in its place, between the projections g³ of
the heads g² of the cylinder g; these heads 2 with their projections g³ form the sides
and inner walls of the chamber y, c'e' are packing pieces pressed by springs c² in the
recess 9 against the disc c.
,
Attached to one of the heads of the cylinder is a valve box i¹, which contains two
valves one for starting, stopping and reversing; the other acting as a check
valve, is a spindle to which the valve is connected, j is a slotted cam keyed to
spindle is the eccentric rod, and jo is the eccentric which thereby works the
valve 2. is a steam pipe, with a branch for supplying cylinder with steam;
s is the exhaust passage; is the cover of valve box ; a bearings for shaft a; k¹ is
a crank arm keyed to or forged solid with the shaft k. k² a pin which may be moved
up or down the slot in crank arm k¹. b is a lever hinged to the stud 6 at bottom;
the other end rests against the pin k; a boss keyed or otherwise fastened to the
shaft a.
The heads and. are here shewn connected by distance pieces h¹º;
a, a, are packing glands; il passage for steam in seat of ; a' is a fly wheel keyed
to the shaft a by key a.
Figure III is an end view with the end of bed A and bearing block removed, to
show the action of the lever b, crank arm k¹, lever and the boss a³; 6 roller running
on a pin in the lever b, and bearing against the boss a³.
Figure IV is an end view of the engine from the valve box end.
Figure V is a plan view of the engine.
Figure VI is an end view of the valve box head g² with the valve box attached,
the cover being removed.
Figure VII is an interior end view of one of the heads g³.
Figure VIII a cross section through the centre of one of the heads g².
Figure IX is an edge view of the same.
Figures X, X and X are side, edge and cross sectional views respectively of the
disc c and piston d separately.
Figures XI, XI, XI, XI, and XIª, are views of the packing pieces c¹ separately.
Figure XII is an underside view, enlarged of the slide with packing picce h¹ in
place and Figure XII is a plan of the groove into which the bottom of the
slide h fits.
Figure XIII is an enlarged sectional view of the foot of the slide 1, and groove
into which it fits, shewing also part of disc c and packing pieces c' and spring c³ for
keeping packing piece h against the disc e.
Figure XIV is a section of a double cylinder 5 is a head inserted between two cylinders,.

page_text: 22 are two metal rings, 3 is a moveable piece for putting in rings, and spiral
spring 4.
The working of the engine is as follows. Steam is admitted to the cylinder through
one of the ports f. f. by moving the valve (Fig. II) the steam drives the piston d
(Fig. 1) round the annular chamber g. When the piston approaches the sliding
abutment h, steam will be cut off by the valve ; the flat surface on the boss a³
(Fig. III) will come opposite the roller 62 supported in the lever b, and this will
allow the piston in the cylinder to withdraw the slide 4, which will stand out
just long enough to allow the piston d to pass, when the slide will be again drawn into the
cylinder by the pressure of the boss a³ on the roller 12, steam being again admitted
by the valve. The exhaust steam passes from the cylinder by the other port,
through the valve j into the exhaust s.
•
The steam acts under the piston h in the cylinder » as an unbreakable spring,
this cylinder has no exhaust, but the cylinder may be of the ordinary type, with a
modification of the check valve, and the levers band, the eccentric arm k¹, shaft k,
and the bracket being dispensed with. This arrangement is designed especially
for use where the slide is arranged to be worked in a horizontal position. Then to
the box forged on the end of the piston rod ³, there may be applied an attachment
to the slide rod of a pump made after this plan and working on the same shaft.
The bottom of the sliding abutment h does not touch the revolving disc c,
but is provided with a packing piece ¹, which comes in contact with the disc c,
and packing pieces c¹. The slide is set by moving the pin k up or down a slot k³
in the eccentric or cam arm k¹.
The sliding abutment h, with its packing piece h¹ and the two packing pieces c¹
make the chamber g steam tight, at that part to the shaft a. The disc c and piston d
at d carry packing pieces round with them.
The packing pieces in the disc and piston are wider, and have stronger springs
than the packing pieces c¹, which prevent c¹ from catching in the groove of the
packing pieces in the disc c; the packing pieces to disc c are too wide to get into
the groove of the packing pieces c¹. The packing pieces in the piston & are made
wider than the slot in the cylinder in which the sliding abutment h works. The
check valve performs two functions: it prevents waste of steam during the with-
drawal of the slide for the passage of the piston d and it works the engine
expansively.
An ordinary ball governor may regulate the speed by making a connection with
the eccentric rod (Fig. II) and allowing the pin which connects the rod ³ with
the cam * to move freely to and fro in a slot in the cam.
The engine is reversible; and the starting, stopping, and reversing are effected
by one valvej (Fig. II).
The outlet on the top of cylinder is to allow any leakage through the piston h
to escape.
The stopper is for lubricating.
The lubricator for lubricating the chamber g and disc c may conveniently be
attached to the steam pipe j.
Figure XIV shews a modification applicable when it is required to avoid a dead
centre and when two cylinders are used, these cylinders g are bolted together with
one head having two projections between them one of the projections being moveable
for the insertion of packing rings and springs to prevent the steam passing from one
cylinder to the other. This cylinder is shewn in Figure XIV in longitudinal section
corresponding to Figure II. The box or distance piece h³ is cast in one piece with a
partition across the centre of the thickness of the flange of the head ¹¹. The rings 2
are carried round with the shaft a by a stud in the shaft a fitting into a groove on the
inside of the ring. The spring 4 is of sufficient strength only to keep the rings in
place so that steam coming in on one side tends to tighten the ring on the other side.
The width of these chambers may be varied according to the power required but
the distance between the outer and inner walls of the chamber should be short, to
facilitate attainment of speed by the engine by providing a short travel for the slide.

page_text: For compounding a number of chambers may be bolted side by side employing one
valve box, on the high pressure chamber. The steam from this being carried to the
other chambers by pipes, with valves in them, under the control of the engine man,
who would be able to put the expansion chambers out of use for reversing or
manoeuvring, and the slides of such series of chambers may be readily worked.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim, is
1. The combination or arrangement and use of parts of apparatus forming a Rotary
Engine or Pump for raising or forcing fluids, substantially as set forth.
2. In a Rotary Engine or Pump for raising or forcing fluids the construction and
use of a rotating disc and annular piston-chamber cooperating as set forth.
3. The combination and use of the sliding abutment, rotating disc and packing
pieces thereto, with an annular piston-chamber all cooperating as set forth and for
the purpose specified.
4. The construction or arrangement of parts substantially as set forth whereby the
working of the sliding abutment is effected by means of the steam, in a rotary engine
or pump, so as to cooperate with the rotating disc and annular piston chamber for the
purpose specified.
5. In a pump or rotary engine the combination or arrangement of parts whereby
the starting, stopping and reversing may be effected by means of one and the same
valve substantially as set forth.
6. The construction and use of a check valve for preventing waste of steam in a
rotary engine or pump during the withdrawal of the sliding abutment and for
regulation of the engine substantially as set forth.
1003
WM. BROOKES & SON,
55 & 56, Chancery Lane, London,
Agents for the Applicant.