Year: 1887

page_text: Date of Application, 1st Oct., 1887
Complete Left, 19th June, 1888
Complete Accepted, 20th July, 1888
We SAMUEL HOPE SHORROCK, Bolton Road and Lee Foundries, Engineer, Darwen,
and JOHN MANGNALL, Lee Foundry, Engineer, Darwen, in the County of Lancaster
do hereby declare the nature of this invention to be as follows:-
This invention relates to that part of "Corliss" steam valve gears, generally known
as engaging and disengaging or tripping gear, and safety apparatus for causing the
engine to stop in case the governor wheels or connections break. Our object is to
make, put together, and use such a combination of details or mechanism as shall
effectually disengage or trip the steel catch plates out of contact with each other in a
simple, useful and efficient manner. Although this improvement is designed to suit
"Corliss" cylinders with the steam valves as well as the exhaust valves at the bottom
of the cylinder, we do not confine ourselves to this arrangement, it being equally
applicable to "Corliss" steam valves at the top and the exhaust valves at the bottom
of the cylinder, or even all the "Corliss" valves at the top of the cylinder. We prefer
however all the "Corliss" valves at the bottom of the cylinder.
We accomplish our object in the following way :-
On a slide fixing which is secured to the cylinder or floor, and fixed in any convenient
position between the "Corliss" steam valve at each end of the cylinder, two slide
blocks are provided-Each of these slide blocks is connected to the lever at the end of
the "Corliss" steam valve spindles, by means of coupling rods-On the top of each
slide block a steel catch plate is let into and firmly secured thereto-A bar which is
connected to the end, and forms a continuation of the "Corliss" steam valve eccentric
rod, will move backward and forward by ineans of the "Corliss" steam valve eccentric―
The outer end of this driving bar is supported and will reciprocate and slide over the
above mentioned slide blocks, but on one side of the same, a distance equal in amount
to the width of the catch plates-At a suitable distance apart and on the slide block
side or edge of the driving bar is pivoted on suitable pins or centres two catch plate
pawls, which will move backwards and forwards with the driving bar-Each pawl will
have a steel catch plate firmly secured and let into same, and will be provided with a
horn or trigger springing from the top vertically for a short distance and then opening
outwards with a suitable bevel depending upon the lift or rise of the governor and the

page_text: traverse of the steam "Corliss" valves-Immediately above and between the before
mentioned horns or triggers a vertical rod or slide is carried or supported in a suitable
fixing At the bottom end of this vertical rod or slide horizontal adjustable arms
project outwards on each side and opposite each other, with pointed ends or provided
with small loose rollers-The top of this vertical rod or slide is connected by suitable
means to the governor in such a manner, that as the governor rises, the vertical
rod or slide is lowered and will disengage or trip the catch plates, for allowing the
supply of steam to be cut off the cylinder sooner, and "vice versa.".
In order that the catch plates on the catch plate pawls may quickly engage or drop
into gear
with the catch plates on the before mentioned slide blocks for the purpose of
opening the steam valves, the vertical part of each disengaging or tripping horn or
trigger is connected together by a steel spiral spring which is always in tension,
and therefore constantly pulling and pressing downwards the catch plate pawls
against the top of the slide blocks connected to the "Corliss" steam valve spindle
levers.
When the movement of the steam eccentric, and therefore the driving bar is on its
dead centres or full throws, the steel catch plates drop into gear with each other-
The slide blocks connected to the valve spindle levers is in turn pushed forward and
opens in turn each "Corliss" steam valve for steaming, and continues to open until
the points or rollers at the ends of the horizontal arms at the bottom end of the vertical
rod or slide connected to the governor is brought into contact with the bevelled part
of the horns or triggers springing upwards from the catch plate pawls-The steel
catches at this point are forced out of gear with each other by the horns or triggers,
and the steam valves are closed by means of a steel spring or springs in dash pots or
buffer boxes in the usual and common manner.
The points of cut off, or the moment the disengaging or tripping of the catch plates
take place, will depend upon the vertical position of the points or rollers at the ends
of the horizontal arms at the bottom of the vertical rod or slide connected to the
governor, which position will be regulated and fixed by the governor, and the load
upon the engine.
In order to prevent the engine racing or running away in case the governor wheels
or connection break, an arrangement of levers, rods and other details will be provided
and which will be operated from the small shaft or centre upon which the levers for
raising and lowering the before mentioned vertical slides is keyed-This safety
apparatus will be so arranged that any accident occurring to the governor wheels or
connections the steel catches in the catch plate pawls will be immediately lifted and
permanently held out of gear and the engine brought to rest.
Dated this 30th day of September 1887.
RICHARD HARGRAVES,
Agent for the Applicants.

page_text: Improvements in "Corliss" Valve Gears.
We SAMUEL HOPE SHORROCK Bolton Road and Lee Foundries Engineer Darwen
and JOHN MANGNALL Lee Foundry Engineer Darwen.in the County of Lancaster
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 that part of "Corliss" steam valve gears generally known
as engaging and disengaging or tripping gears. Our object is to make and use such
a combination of details or mechanism as shall effectually disengage or trip the steel
catch plates out of contact with each other in a simple useful and efficient manner.
Although this improvement is designed to suit "Corliss" cylinders with the steam
valves as well as the exhaust valves at the bottom of the cylinder we do not confine
ourselves to this arrangement it being equally applicable to Corliss steam valves at the
top and the exhaust valves at the bottom of the cylinder or even all the "Corliss"
valves at the top of the cylinder. We prefer however all the Corliss valves at the
bottom of the cylinder.
And in order that our invention may be better understood we have caused to be
appended hereunto a sheet of drawings marked with letters of reference indicating like
parts throughout the various figures.
Fig. 1. This is a front elovation shewing the slide fixing catch plates with disengaging
horns or triggers and governor connections.
Fig. 2. This is a plan of the above.
Fig. 3. This is a sectional elevation of the slide fixing shewing also disengaging and
governor connections.
Fig. 4. This is a plan shewing governor pillar vertical slide &c. in connection with
governor connections.
On a slide fixing A which is secured to the cylinder or floor, and fixed in any
convenient position between the "Corliss" steam valve B Fig. 1 at each end of the
cylinder two slide blocks (Fig. 1 & 3 are provided. Each of these slide blocks C is
connected to the levers D Fig. 1 at the end of the "Corliss" steam valve spindles by
means of coupling rod E Fig. 1 & 2. On the top of each slide block a steel catch
plate F is let into and firmly secured thereto. A bar G Fig. 1. 2 & 3 which is
connected to the end and which forms a continuation of the "Corliss" steam valve
eccentric rod will move backwards and forwards by means of the steam valve
eccentric.
The outer end of this driving bar G is supported and will reciprocate and slide over the
above mentioned slide-blocks C, but on one or both sides of the same a distance equal
in amount to the width of the catch plates F. At a suitable distance apart and on the
slide block sides or edges of the driving bar G is pivoted on suitable pins or centres
two catch plate pawls H Fig. 1. 2 & 3 which will imove backwards and forwards with
the driving bar G.

page_text: Each pawl will have a steel catch plate I Fig. 1 firmly secured and let into same
and will be provided with a horn or trigger J. Fig. 1. 2 & 3 springing from the top
vertically for a short distance and then opening outwards with a suitable bevel
depending upon the lift or rise of the governor and the traverse of the steam "Corliss"
valve eccentric. Immediately above and between the before mentioned horns or
triggers Ja vertical rod or slide K is carried or supported in a suitable fixing L
Fig. 1. 3 & 4. At the bottom end of this vertical rod or slide K horizontal adjustable
arms M project outwards on each side and opposite each other with pointed ends or
provided with small loose rollers N as shewn in Fig. 1. 2 & 3. The top of this vertical
rod or slide K is connected to the governor through the levers O and P and the rod Q
in such a manner that as the governor balls rise the vertical rod or slide K is lowered
and will disengage or trip out of gear the steel catch plates F & I for allowing the
supply of steam to be cut off from the cylinder sooner and vice versa.
In order that the catch plates I on the catch plate pawls H may quickly engage or
drop into gear with the catch plates F on the before mentioned slide blocks C for the
purpose of opening the steam "Corliss" valves the vertical part R Fig. 1 of each
disengaging or tripping horn or trigger J is connected together by a steel spiral
spring S Fig. 1 which is always in tension and therefore is constantly pulling and
pressing downwards the catch plate pawls H against the top of the slide blocks C
connected to the "Corliss" steam valve spindle levers D.
When the movement of the steam eccentric and therefore the driving bar G is on
the dead centres or full throws, the steel catch plates F & I drop into gear with each
other. The slide blocks C connected to the valve spindle levers D at each end of
the cylinder is in turn pushed forwards and opens in turn each Corliss steam valve B
for steaming and continues to open until the points or rollers N at the ends of the
horizontal arms M at the bottom end of the vertical rod or slide K connected to the
governor comes into contact with the bevelled part of the horns or triggers J
springing upwards from the catch plate pawls H. The steel catches F & at this
point are forced out of gear with each other as shewn in Fig. 1. The Corliss steam
valves are closed by means of a steel spring or springs in a dash-pot or buffer box
in the usual and ordinary, manner not shewn on drawing.
The points of cut off or the moment the disengaging or tripping of the catch
plates F&I take place will depend upon the vertical position of the rollers N at the
end of the horizontal arms M at the bottom of the vertical rod or slide K connected
to the governor which position will be regulated and fixed by the governor and the
load upon the engine.
Having now particularly described and ascertained the nature of our said Inven-
tion and in what manner the same is to be performed we declare that what
we claim is
Firstly. The engaging and disengaging or tripping gear consisting of the combina-
tion of parts or details C. E. F. G. H. I..J. K. L. M. N. substantially as shewn in
drawing, and for the purpose herein specified.