Year: 1885

page_text: I GEORGE SELLERS of Batley in the County of York Consulting Engineer, do
hereby declare the nature of this invention to be as follows:-
This invention has for its object a machine for setting out and testing the valves
of steam and other engines.
The machine consists of a frame or base board on which a wheel or disc is
mounted.
On one side of this wheel or disc and in the same plane two slides are provided
they are connected by rods to eccentric pins on the face of the disc as herein after
described.
On the other side of the wheel or disc there is a third slide similarly connected
with an eccentric pin carried by the disc.
When the wheel is turned by hand all these slides move in a direction to and
from the centre of the wheel or disc.
When the apparatus is in use say to test the action of the valves of an existing
engine the two slides first mentioned have fixed to them cardboard diagrams of the
main and the cut off valves respectively and the base board itself has fixed to it
a diagram of the cylinder ports. These diagrams are drawn to any scale which
may for convenience be selected and are set in their proper relative positions.
The wheel or disc has a radial slot in which is a slider carrying the pin connected
with the slide on which is the diagram of the main valve By means of a screw
this slider is traversed until the distance of the pin from the centre as indicated
by a scale on the face of the disc or wheel accords with the position of the centre
of the main eccentric relatively to that of the main shaft. An arm clamped to this
pin carries a second pin and this by the aid of an angle scale on the face of the
wheel or disc is set to a position to represent the centre of the cut off eccentric.
Another arm clamped to the second pin carries a third pin which is similarly
set to a position to represent the crank both in its angular position and distance
from the centre.
The rod which connects this latter pin with its slide is in two parts which are
connected by a clip so that the effective length can be adjusted to correspond to
that of the connecting rod of the engine on the scale which has been selected,

page_text: Opposite to the slide operated by the last mentioned rod a scale in cardboard is
fixed on the base board representing the length of stroke and subdivided in any
convenient manner.
The apparatus when thus set up is ready for use, the wheel can be turned step
by step through equal angular intervals and the position of the valve and piston at.
each step can be ascertained by inspection.
心
.
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A Machine for Setting Out and Testing the Valves of Steam and
other Engines.
I GEORGE SELLERS of Batley in the County of York Consulting 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:-
This Invention has for its object a machine for setting out and testing the valves
of steam and other engines.
The machine consists of a frame or base board on which a wheel or disc is
mounted.
On one side of this wheel or disc and in the same plane two slides are provided
they are connected by rods to eccentric pins on the face of the disc as herein after
described.
On the other side of the wheel or disc there is a third slide similarly connected
with an eccentric pin carried by the disc.
When the wheel is turned by hand all these slides move in a direction to and
from the centre of the wheel or disc.
When the apparatus is in use say to test the action of the valves of an existing
engine the two slides first mentioned have fixed to them cardboard diagrams of the
main and the cut off valves respectively and the base board itself has fixed to it
a diagram of the cylinder ports. These diagrams are drawn to any scale which
may for convenience be selected and are set in their proper relative' positiona
The wheel or disc has a radial slot in which is a slider carrying the pin connected
with the slide on which is the diagram of the main valve. By means of a screw
this slider is traversed until the distance of the pin from the centre as indicated
by a scale on the face of the disc or wheel accords with the position of the centre
'of the main eccentric relatively to that of the main shaft. An arm clamped to this
"

page_text: pin carries a second pin and this by the aid of an angle scale on the face of the
wheel or disc is set to a position to represent the centre of the cut off eccentric.
5.
Another arm clamped to the second pin carries a third pin which is similarly
set to a position to represent the crank both in its angular position and distance
from the centre.
The rod which connects this latter pin with its slide is in two parts which are
connected by a clip so that the effective length can be adjusted to correspond to
that of the connecting rod of the engine on the scale which has been selected.
Opposite to the slide operated by the last mentioned rod a scale in cardboard is
fixed on the base board representing the length of stroke and subdivided in any
convenient manner.
The apparatus when thus set up is ready for use, the wheel can be turned step
by step through equal angular intervals and the position of the valve and piston at
each step can be ascertained by inspection.
In order that my said invention may be most fully understood and readily
carried into effect I will proceed to describe the drawing hereunto annexed.
の
DESCRIPTION OF THE DRAWING.
The drawing shows in plan an apparatus constructed in accordance with my
invention.
a is a base board. b is a wheel mounted so as to be able to revolve freely about
a stud b¹ fixed into the base board. c and d are two slides mounted on the base
board and held in place thereon by dovetail guides a a The slides are so
arranged that they can move towards and from the centre of the wheel b. f is a
third slide also working in guides mounted on the base board and capable of
movement to and from the centre of the wheel b. g is an eccentric pin carried
upon a block which is moveable along a radial slot in the face of the wheel b. h is
a screw with a milled head; the screw passes through the block and by turning
it the block can be moved to and from the centre of the wheel b. The pin g
receives upon it one end of the rod i.' and the other end of this rod is connected with
the slide c. Over the end of the rod the pin g receives upon it the slotted arm j, and
this can be clamped fast when in any position on the stud by means of the locking
nut k which is provided with handles k¹ convenient for turning it. The arm j
carries at its end a stud j¹ and this stud receives upon it the eye of the rod l, and
this rod which is of the same length as the rod i, is connected by an eye at its
other end with a stud fixed into the slide d. The stud j¹ also receives another
slotted arm m and by a clamping nut n provided with handles n¹ this arm can be
clamped in any desired position upon the stud 7. The arm m carries at its end
a stud m¹ and this by a connecting rod o is connected with the slide f-The
connecting rod o is telescopic and can be adjusted to any desired length and then
set fast by a clamping screw o¹.
In the use of the apparatus the centre of the pin g is set to a distance from the
centre of the wheel at b¹ equal to the eccentricity of the main eccentric of the
engine and this is done by the aid of the scale q which is provided upon the face
of the wheel. This having been done the stud j¹ is set to a position to represent
the centre of the cut off eccentric both in angular distance from the centre of the
main eccentric and in linear distance from the centre of the wheel b this distance
represents the eccentricity of the cut off eccentric-This adjustment is made by
the aid of the angular scale r fixed upon the surface of the wheel b. The stud m¹
has now to be set to a position to represent the centre of the crank pin in the actual
engine that is to say the angular distance of the stud m¹ from the pin g is to be
the same as the angular distance of the main eccentric from the centre of the crank
pin but the radial distance of the stud m³ from the centre of the wheel b is not the
actual length or throw of the crank but some convenient fraction of this-The
length of the connecting rod o is then adjusted to represent on the same scale the
5 length of the connecting rod in the actual engine. The apparatus is now ready

page_text: for use as soon as diagrams of the valves and ports which it is wished to study
have been mounted upon it as already described-Thus on the slide o a diagram 8
of the main valve is mounted. On the slide d a diagram t of the cut off valve is
attached and on the guide a' which is fixed to the base board a a diagram u
representing the cylinder ports is secured These having been properly set in
relation the one to the other for any position in the stroke of the engine, the
positions which they will assume in every other part of the stroke can be
ascertained by simply turning the wheel b by hand. The part of the stroke which
has been arrived can at any time be read off upon the scale v and the corresponding
position of the valves is apparent from an examination of the diagrams.
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.) A machine for setting out and testing the valves of steam and other engines
consisting of a wheel 6 arranged to carry adjustable eccentric pins and studs g. 11
and m' and slides c d. and f and connecting rods i. and o connecting the said
slides with the studs carried by the wheel substantially as described.
(2.) In connection with the foregoing the adjustable connecting rod o¹ capable
of being adjusted to represent the connecting rod of an engine to a suitable scale,
(3.) A machine for setting out and testing the valves of steam and other engines 2
substantially as described and represented by the annexed drawing.