Worked by Fluid Pressure.
Year: 1885

page_text: Worked by Fluid Pressure.
I GEORGE CAWLEY of 67 King Street Manchester in the County of Lancaster
Mechanical Engineer do hereby declare the nature of invention for IMPROVEMENTS
IN VALVE GEAR FOR STEAM AND OTHER ENGINES WORKED BY FLUID PRESSURE,
to be as follows:-
These improvements relate to the valve gear of steam and other engines operated
by fluid pressure and have for their objects:
(1) To obtain the motion of the expansion valve from the Engine cross head.
(2) To determine or vary the admission of steam or other fluid through the
agency of a lever having a moveable fulcrum attached to a centrifugal or other
governor or alternatively attached to a frame nuts or other apparatus adjustable
by hand.
For the purposes of this invention I may attach to the Engine Cross head directly
or by means of any suitable levers or link work an arm or lever pivotted or jointed
to the expansion valve spindle and working upon a suitable moveable or fixed
fulcrum. By this means the motion of the expansion valve is similar to that
which would be derived from an eccentric coincident with or directly opposite to
the Crank pin.
In order to determine or vary the admission of steam or other fluid to the
engine cylinder I attach to the lever pivotted to the expansion valve spindle, a
fulcrum carried on a sliding block or frame or other suitable arrangement which is
moved by the governor or alternatively is moved by a hand wheel and screw or
other adjusting arrangements. By this arrangement the travel or extent of motion
of the expansion valve is made variable and the admission of steam or other fluid
to the Engine Cylinder thereby varied or determined.
Dated this twenty fourth day of February one thousand eight hundred and

page_text: Improvements in valve Gear Ior
Steam
لما
Worked by Fluid Pressure.
BEBRAVO
I, GEORGE CAWLEY of 67 King Street Manchester in the County of Lancaster
Mechanical Engineer do hereby declare the nature of my invention for IMPROVE-
MENTS IN VALVE GEAR FOR STEAM AND OTHER ENGINES WORKED BY
FLUID
PRESSURE and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:
These Improvements relate to the valve gear of steam and other engines operated
by fluid pressure and have for their objects: (1) To obtain the motion of the
expansion valve from the Engine crosshead and (2) To determine or vary the
admission of steam or other fluid through the agency of a lever having a movable
fulcrum attached to a centrifugal or other governor or alternatively attached to a
frame nuts or other apparatus adjustable by hand.
And in order that this my said Invention may be more readily understood and
carried into practical effect I have hereunto appended a sheet of Drawings having
the Figures thereon marked with similar letters to denote similar parts and
reference being hereinafter had thereto.
Fig. 1 represents in elevation and Fig. 2 in plan a wall engine having these
Improvements applied thereto.
For the purposes of this Invention I may attach to the Engine crosshead directly
or by means of any suitable arrangement of levers rods or linkwork an arm.or
lever A pivoted jointed or connected to the expansion valve spindle B and working
upon a suitable movable or fixed fulcrum. As shown in the Drawings the arm or
lever A is represented as working upon a movable fulcrum C hereinafter described
and as jointed to the expansion valve spindle by means of a slotted disc D. This
arrangement permits the angular motion of A to be transformed into rectilinear
motion in B with great facility. The lower end of the arm or lever A is also shown
as connected to the crosshead by means of the link or rod E but it may be other-
wise connected by means of levers rods or link work. This or an equivalent
disposition of the arm or lever A and its connecting rods or links imparts a motion
to the expansion valve similar to that which would be derived from an eccentric
coincident with or directly opposite to the crank pin.
In order to determine or vary the admission of steam or other fluid to the
Engine cylinder I attach to the lever A a inovable fulcrum C carried upon a sliding
block or frame F or other suitable arrangement which is moved by the governor
or alternatively is moved by a hand-wheel G and screw H or by other adjusting
arrangements. By this means the travel or extent of motion of the expansion
valve is made variable since when the movable fulcrum is lifted or lowered by the
action of the governor or by rotation of the hand wheel the motion imparted to B
by the shorter or longer effective radius of A will produce a correspondingly shorter
or longer travel or amount of motion in the expansion valve and the admission
of steam or other fluid to the cylinder is thereby varied. When it is not desired
to vary the admission of steam or other fluid from time to time, that is to say when

page_text: it is desired to determine a fixed cut off a fixed fulcrum may be employed instead
of a movable fulcrum. In this case the fulcrum may be secured to a bracket
attached to the Engine bed or framing or directly to the Engine bed or framing
itself and the position of the fulcrum must be determined by the point of cut
off or the amount of motion to be imparted to the expansion valve.
The main valve may be driven by an eccentric in the usual manner or motion
may be imparted to it from the crank pin or connecting rod by means of a rod
and lever or link work as indicated on the Drawing and as described in my
specification to Letters Patent No 16304 of A.D 1884.
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.) In a steam or other engine operated by fluid pressure, a lever connected to
the engine cross head and to the expansion valve spindle and having a fulcrum the
position of which relatively to the expansion valve spindle may be varied by hand
or by the action of a governor, substantially as and for the purpose herein before
described and as illustrated on the accompanying sheet of Drawings.
(2.) In a steam or other engine operated by fluid pressure, the combination of a
lever connected with the expansion valve spindle and having a fixed fulcrum, with
a link or rod or with levers rods or link work connecting the lever A with the
engine crosshead for the purpose of imparting a fixed amount of motion or travel-
to the expansion valve from the engine cross head; substantially as hereinbefore
described.
(3.) In a steam or other engine operated by fluid pressure, the combination of
the lever A connected to the expansion valve spindle and having a movable fulcrum,
with a link or rod or with lever rods or linkwork connecting the lever A to the
engine crosshead, substantially as and for the purpose herein before described and
as illustrated on the accompanying sheet of Drawings.