Improvements in Compound Engines of the Road Locomotive, Traction Engine, Road Roller, and Agricultural type, wherein the Motor is Mounted on a Boiler.
Year: 1899

page_text: Date of Application, 16th Aug., 1899
Complete Specification Left, 16th May, 1900-Accepted, 14th July, 1900
PROVISIONAL DIPOLT 10ALIUN.
Improvements in Compound Engines of the Road Locomotive,
Traction Engine, Road Roller, and Agricultural type, wherein
the Motor is Mounted on a Boiler.
We, ALFRED SHUTTLEWORTH and FRANK SHUTTLEWORTH, Agricultural
Engineers, and WILLIAM FLETCHER, Mechanical Draughtsman, all of Stamp End
Works, Lincoln, in the County of Lincoln, do hereby declare the nature of this
invention to be as follows:-
In compound engines designed for use as road locomotives, traction engines,
road rollers and agricultural engines there have been mounted on a boiler a
couple of cylinders of different diameters adapted to be used as high and low
pressure cylinders respectively; and this invention has reference to an improved
construction of this type of engine according to which the high and low pressure
cylinders are arranged side by side; the steam chests and distributing valves are
placed on top of the cylinders; the said valves are actuated by radial valve gear
such as or similar to that known as Joy's; provision is made for enabling the
engine to be whenever required (as for example for starting purposes or for over-
coming obstacles) worked as a simple double-cylinder engine, steam practically
at boiler pressure being then admitted to both cylinders instead of to one cylinder
only, both cylinders then exhausting into the atmosphere. An arrangement for
this purpose is as follows:-.
A cock or cocks adapted to be partially rotated by a lever or equivalent is
constructed with ports so disposed that when the lever is in one position, the
exhaust steam from the high pressure cylinder passes by way of a receiver to the
steam side of the low pressure slide valve, whereas on turning the lever into
another position, the low-pressure steam chest is put into direct communication
with the high-pressure steam supply, the exhaust steam from the smaller or
high pressure cylinder being then allowed to pass directly to the atmosphere,
by means of a single cock having two ports, one of which forms a passage whereby
the high pressure exhaust passes either into the atmosphere or into the receiver
according to the position of the lever, while the other port when open admits high
pressure steam to, or when closed cuts it off from the larger
or low pressure
cylinder; the engine in the first instance working as a simple and in the second
instance as a compound engine.
The mechanism of the engine is so arranged that both the distributing valves,
as well as the throttle valve, and the stop valve can be examined on the removal
of a single cover.
By this invention eccentrics being dispensed with on the crank shaft in an
engine of the type referred to the two speed first motion gearing can be placed
inside the box brackets in a four shaft engine, without crowding the parts of the
mechanism; the same gearing can be used throughout as for a single cylinder
road locomotive; the slide valve faces and valve rods being parallel with the:
centre line of the cylinders, the setting of the cylinder on the machine for tooling,

page_text: the planing of the slide valve faces, and the boring of the slide valve stuffing
boxes are simplified; the slide valves are readily accessible for setting, examina-
tion or repair the boiler need not be of larger diameter than for a single cylinder
engine and the economy of space effected permits the introduction of three-speed
gearing when desired.
Improvements in Compound Engines of the Road Locomotive,
Traction Engine, Road Roller, and Agricultural type, wherein
the Motor is Mounted on a Boiler.
We, ALFRED SHUTTLEWORTII, and FRANK SHUTTLEWORTH, Agricultural
Engineers, and WILLIAM FLETCHER, Mechanical Draughtsman, all of Stamp End
Works, Lincoln, in the County of Lincoln, 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:—
In compound engines designed for use as road locomotives, traction engines,
road rollers and agricultural engines, there have been mounted on a boiler a
couple of cylinders of different diameters, adapted to be used as high and low
pressure cylinders respectively; and this invention has reference to an improved
construction of this type of engine according to which the high and low pressure
cylinders are arranged side by side; the steam chests and distributing valves
are placed on top of the cylinders; the said valves are actuated by radial valve
gear such as or similar to, that known as Joy's; and provision is made for enabl-
ing the engine to be, whenever required, as for example for starting purposes, or
for overcoming obstacles, worked as a simple double-cylinder engine, steam
practically at boiler pressure being then admitted to both cylinders instead of to
one cylinder only, both cylinders then exhausting into the atmosphere.
The mechanism of the engine is so arranged that both the distributing valves,
as well as the throttle valve, and the stop valve can be examined on the removal
of a single cover.
Figs. 1 and 1 of the accompanying illustrative drawings show respectively in
plan and side elevation, so much of a road locomotive according to this invention
as is necessary to explain the construction thereof. Figs. 2, 3 and 4 are
respectively a plan, a rear end elevation and a cross section on the line A A of
Fig. 2, showing the high and low pressure cylinders, valve chests and adjacent
parts. Fig. 4a is a section on the line AA of Fig. 2, and Fig. 4b is a section
pártly on the line A2 A2 and partly on the line A3 A3 of Fig. 4. Figs. 5, 6 and 7
are respectively a side elevation, a plan and a vertical section on the line B B
of Fig. 5, showing an arrangement of auxiliary starting gear for use in such a
road locomotive. Figs. 8 and 9 are sections on the lines CC, and D D respectively
of Figs., and Figs. 8 and 9 are similar views to Figs. 8 and 9 respectively but
showing the parts in different relative positions.
I is the high pressure cylinder and 2 the low pressure cylinder, these being
arranged side by side upon the top of the boiler 3, the respective valve chests 4
and 5 being placed on top of the cylinder, as shown, so that the valve faces 6

page_text: and 7 upon which the high and lower pressure slide valves 8 and 9 respectively
work, are horizontal. The piston rod 10 of each cylinder is secured to a cross-
head 11 that is arranged to reciprocate in a suitably supported guide frame 12
and is connected by a rod 13 to a crank 14 on the main driving shaft 15 with
which the secondary shaft 15" can be connected through one or other of two
sets of spur gearing 15b, as well understood. The shaft 15 is supported in suitable
bearings 16 carried by box brackets 17 fixed to the top of the boiler, the two
cranks being at right angles to each other.
Each of the valve rods 8", 9ª of the slide valves 8 and 9 is arranged to work
through a stuffing box, as usual, and through a guide 18 carried by the corre-
sponding guide frame 12, and is connected to one end of a link 19 the other end
of which is jointed to and between the upper ends of a pair of links 20 that form
part of an arrangement of Joy's radial valve gear and are jointed to two parallel
dies 21, the lower ends of the links 20 being jointed at 22 to a pair of rods 23
that are jointed at one end to the connected rod 13 and at the other end to one
end of a radius link 24 the other end of which is jointed at 25 to the fixed
bracket or support 26 that assists in supporting the guide frame 12. The two
dies 21 are arranged to work in curved slots or guideways 26 formed in the inner
side of two cheeks or plates 27 that are connected together by bolts 28. The two
pairs of cheeks or plates 27, for the two valves, are connected together by an
intermediate connection 20 and are provided at their outer sides with two
trunnions 29 that are journalled in bearings 29ª carried by two brackets 29
extending upward from the plates or brackets 29 supporting the front end of the
guide frames 12, the two trunnions 29 with intermediate connection 28ª con-
stituting a weigh shaft provided with a lever arm 29d by which the valve gear
can be adjusted in a manner well understood through suitable mechanism which
is not shown but may be of any known or suitable kind.
The arrangement of auxiliary starting gear shown in the drawings for enabling
the engine to be worked, when desired, either as a compound engine, or as a
simple double cylinder engine, comprises a cock the plug 30 of which is formed
with an upper chamber 31 having ports 31 and 31, and with a lower chamber 32
having ports 32", 32. The plug is mounted to be partly rotated by a lever 33,
in a case 34 having three upper branch passages 35, 35 and 35 opposite which
the ports 1 and 31 in the plug 30 can be brought, and two lower branch
passages 36 and 36" opposite which the ports 32 and 2 in the said plug can be
brought. The passage 35 is placed in communication with the intermediate
pressure receiver 37 into which the high pressure cylinder 1 exhausts; the
passage 35 is placed in communication with the low pressure valve chest 5:
and the passage 35b is connected to an exhaust pipe 38. The lower branch
passage 36 is placed in communication with the high pressure valve chest 4 by
a pipe 39, and the branch passage 30 is placed in communication with the
low pressure valve chest 5 by a pipe 40.
As will be seen the arrangement is such that when the plug 30 and lever 33
are moved into the positions shown in Figs. 8 and 9. the engine will work as a
compound engine, the exhaust steam from the high pressure cylinder 1 passing
from the receiver 37 through the passage 35, plug chamber and ports 31, 31*
and 31b and passage 35" to the low pressure valve chest 5, the pipes 39 and 40
being disconnected from each other, whereas upon turning the plug and lever
into the positions shown in Figs. 8 and 9, the engine will work as a simple double
cylinder engine, the low pressure valve chest 5 being then placed in direct com-
munication with the high pressure valve chest through the pipe 39, lower plug
chamber 32 and its ports 32, 32b and the pipe 40, the exhaust steam from the high
pressure cylinder exhausting from the receiver 37 to the exhaust pipe 38 through
the passage 35, plug chamber 31 and its ports 31 and 31 and the passage 35b
High pressure steam is supplied to the high pressure valve chest 4 through a
pipe 41 to a jacket that surrounds the cylinders 1 and 2, whence it flows through
a passage provided with a stop valve 42 into a chamber 43 provided with a throttle

page_text: valve 43" and thence into the high pressure valve chest 4, the throttle valve
operating spindle 44 and stop valve spindle 45 extending through glands 44°
and 45 respectively. By this arrangement it will be seen that upon removing
the single cover (" common to the two valve chests 4 and 5, access can be gained
to the high and lower pressure slide valves, the throttle valve and the stop valve
for examination or repairs.
46 (Fig. 4) is the high pressure exhaust passage leading to the receiver 37
which communicates with the low pressure valve chest 5 at 47, and 48 is the low
pressure exhaust passage communicating with the exhaust pipe 38.
By this invention eccentrics being dispensed with on the crank shaft in an engine
of the type referred to, the two speed first motion gearing 15, 15ª 16 can be placed
inside the box brackets 17 in a four shaft engine, without crowding the parts of the
mechanism; the same gearing can be used throughout as for a single cylinder
road locomotive; the slide valve faces and valve rods being parallel with the
centre line of the cylinders, the setting of the cylinder on the machine for tooling,
the planing of the slide valve faces, and the boring of the slide valve stuffing
boxes are simplified; the slide valves are readily accessible for setting, examina-
tion or repair the boiler need not be of larger diameter than for a single cylinder
engine and the economy of space effected permits the introduction of three-speed
gearing when desired.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that what
we claim is-
1. A compound engine of the type herein referred to wherein the high and
low pressure cylinders are arranged" side by side, the steam chests and distributing
valves are placed on top of the cylinders, and the valves are actuated by radial
valve gear such as or similar to that known as Joy's, substantially as described
2. The combination with the high and low pressure cylinders of a compound
engine of the type herein referred to of auxiliary starting gear comprising a cock
the plug and case of which are constructed substantially as described and shown
with ports and passages that are so arranged in relation to each other and
to the high and low pressure steam chests and the exhaust pipe of the engine that
by suitably turning the plug, the engine can be worked at will, either as a com-
pound engine, or as a simple double cylinder engine, substantially as described.
3. The improved compound engine of the type herein referred to, constructed
arranged and operating substantially as herein before described with reference to
the drawings annexed.