IMPROVEMENTS IN STEAM ENGINES FOR VARYING THE INLET OF STEAM TO THE CYLINDERS THEREOF to be as follows:-
Year: 1884

page_text: I THOMAS MILNES FAVELL of Etruria Iron Works Stoke upon Trent, Mechanical
Engineer do hereby declare the nature of said Invention for "IMPROVEMENTS IN
STEAM ENGINES FOR VARYING THE INLET OF STEAM TO THE CYLINDERS THEREOF
to be as follows:-
"
My Invention has for its object to provide steam Engines with an arrangement
whereby the inlet of steam to the cylinder or cylinders is capable of being regulated
as required either automatically by the engine itself or by hand.
According to my Invention I provide at the back or face of the slide valve plates
or cut off slides situated between the steam inlets through the valve which plates
or cut off slides are capable of being moved to alter their position relatively with
the slide valve so as to cause the said steam inlets through the valves to be opened
for a greater or lesser period or to cut off entirely the inlet for steam. This
movement of the cut off slides may be effected by an arrangement of levers
resembling that of a lazy tongs and consisting of a pair of arms connected at one
end to a fixed centre in the steam chest and at their other ends to the cut off
slides by a sliding connection for accommodating the motion of the levers. Similar
arms are attached at their inner ends to the said connection with the cut off slides
the other ends of the said arms being attached to a rod passing to outside the steam
chest and being attached to means for enabling it to be actuated by a Governor or
by hand. As the said rod is moved inwards by means of the Governor or by
hand as the case may be the ends of the arms which are connected to the cut off
slides are moved apart and the said slides are correspondingly moved and as the
slide valve moves cut off the steam at the necessary period. If it be desired to
make the cut off slides capable of being operated by hand as well as by the
Governor the outer ends of the one pair of arms are attached as aforesaid to the
rod actuated by the Governor the outer ends of the other pair of arms being fixed
to a centre carried by a rod passing to outside the steam chest and capable of being
moved inwards or outwards by hand,

page_text: COMPLETE SPECIFICATION.
"
I THOMAS MILNES FAVELL of Etruria Iron Works Stoke upon Trent Mechanical
Engineer do hereby declare the nature of my invention for "IMPROVEMENTS IN
STEAM ENGINES FOR VARYING THE INLET OF STEAM TO THE CYLINDERS THEREOF
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
My Invention has for its object to provide Steam Engines with a convenient and
efficient arrangement whereby the inlet of Steam to the cylinder or cylinders is
capable of being regulated as required either automatically by the Engine itself or
by hand.
According to my Invention I provide at the back or face of the slide valve plates
or "cut off" slides situated between the steam inlets through the valve which
plates or cut off slides are capable of being moved to alter their position relatively
with the slide valve so as to cause the said steam inlets through the valves to be
opened for a greater or lesser period or to cut off entirely the inlet for steam. This
movement of the cut off slides may be effected by an arrangement of levers
resembling that of lazy tongs and consisting of a pair of arms connected at one
end to a fixed centre in the steam chest and at their other ends to the cut off slides
by a sliding connection for accommodating the motion of the levers. Similar arms
are attached at their inner ends to the said connection with the cut off slides the
other ends of the said arms being attached to a rod passing to outside the steam
chest and being attached to means for enabling it to be actuated by a Governor or
by hand. As the said rod is moved by means of the governor or by hand as the
case may be the ends of the arms which are connected to the cut off slides are
moved apart and the said slides are correspondingly moved and as the slide valve
moves cut off the steam at the necessary period. If it be desired to make the cut
off slides capable of being operated by hand as well as by the governor the outer
ends of the one pair of arms are attached as aforesaid to the rod actuated by
the Governor the outer ends of the other pair of arms being fixed to a centre
carried by a rod passing to outside the steam chest and capable of being moved
inwards or outwards by hand.
And in order that my said Invention may be fully understood I shall now
proceed more particularly to describe the same and for that purpose shall refer to
the several figures on the annexed sheet of drawings the same letters of reference
indicating corresponding parts in all the figures.
"
.
Figure 1 represents in side view with the cover removed and Figure 2 in
sectional plan an arrangement of the apparatus according to my Invention wherein
the cut off slides are operated automatically by a Governor.
Figures 3 and 4 are views similar to figure 1 shewing respectively an arrange-
ment wherein the cut off slides are adjusted by hand and the automatic operation
and hand adjustment combined. Referring to Figures 1 and 2 at the back or face
of the slide valve A and between the steam ports B therein are mounted two plates
t:

page_text: or cut off slides CC capable of being moved longitudinally towards and away from
each other between the positions shown in fall and dotted lines in Figure 1. To a
pin F fixed in the steam chest are centred the arms E the other ends being centred
by the pins K. K to blocks D capable of moving in guides in the plates or cut off
slides C. To these pins K are also centred the arms G G centred at their other
ends to a pin H to which is attached the rod J operated by the movement of the
governor through the intervention of a lever as clearly shewn. The rod J passes
through a gland or other steam tight opening into the steam chest.
As the speed
of the engine increases the lever of the governor moves the rod J inwards and
causes the arms G and E to approach the position shewn in dotted lines moving
the plates or cut off slides further from each other so that the steam ports in
the slide valve remain uncovered for a shorter period than they do when the
Engine runs more slowly and the plates are closer together. Figure 3 shews the
mechanism arranged to be operated by hand for giving an adjustment of the cut
off slides as required for any degree of expansion. Figure shews this means
for operating by hand combined with the means for automatically varying the
position of the slides by means of a Governor so that the initial adjustment of
the slides may be made by hand and the automatic adjustment be effected by
the movement of the Governor during the working of the Engine. The other
parts in these arrangements are arranged as described with regard to Figures 1
and 2 and are marked with the same letters of reference.
It will be evident that with single acting engines one of the cut off slides or
plates may be arranged to be operated by one set of levers or arms.
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
The arrangement with the slide valves of steam engines of a cut off slide or plate
or cut off slides or plates in combination with arms or levers centred to a fixed or
adjustable centre and to a centre or centres on the said cut off slide or plate or
slides or plates and connected to an extension or extensions passing to the exterior
of the steam chest and provided with means for being operated upon automatically
by a Governor or by hand or both by a Governor and by hand substantially as
herein before described with reference to the accompanying drawings.
"
2 T
100