Improvements in Valve Gear for Oscillating-cylinder Engines.
Year: 1891

page_text: Date of Application, 14th Aug., 1891
Complete Specification Left, 13th May, 1892-Accepted, 18th June, 1892
PROVISIONAL SPECIFICATION.
Improvements in Valve Gear for Oscillating-cylinder Engines.
I, MATTHEW PAUL, Junior, of Levenford Works, Dumbarton in the County
of Dumbarton, North Britain, Engineer, do hereby declare the nature of this
invention to be as follows that is to say:
My said invention has for its object to improve and simplify the construction and
arrangement of valve gear for oscillating cylinder engines.
In carrying out my invention I may employ any suitable known kind of
reciprocating distribution valve working in a valve casing upon the side of an
oscillating cylinder. I cause a part of the valve's motion to be derived from the
oscillation of the cylinder by arranging a lever which moves the valve to be acted
on by a guide bar which is curved and which may be slotted like an ordinary valve-
motion link. This valve motion guide bar is attached to a slide which can move
in a stationary guide in a direction in or parallel to the plane passing through the
axis of the crank shaft and the axis of oscillation of the cylinder. The slide is by
an eccentric on the crank shaft, made to reciprocate to an extent corresponding to
the lead and lap of the valve, the eccentric being placed directly opposite to the
crank. Or the reciprocation of the slide may be obtained in any other suitable
manner. The valve motion guide bar is made angularly adjustable upon the slide
and its adjustment determines the direction of rotation of the engines and also the
extent of opening or point of cut-off of the valve. The adjustment of the valve-
motion guide bar is effected by a suitable arrangement of levers and links connecting
it to a reversing lever or shaft as with existing valve gear.
As the cylinder oscillates the end of the valve lever moves along the valve-
motion guide bar, and receives a compound motion partly due to the shape or
curvature of that bar and its angular position and partly due to the reciprocation
of the slide carrying the guide bar.
Dated this Thirteenth day of August 1891.
TEXTI
EDMUND HUNT,
Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in Valve Gear for Oscillating-cylinder Engines.
1, MATTHEW PAUL, Junior, of Levenford Works, Dumbarton, in the County
of Dumbarton, North Britain, 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, that is to say :-
My said invention has for its object to improve and simplify the construction and
arrangement of valve gear for oscillating cylinder engines.
In carrying out my invention 1 may employ any suitable known kind of
reciprocating distribution valve working in a valve casing upon the side of an
oscillating cylinder. 1 cause a part of the valve's motion to be derived from the
oscillation of the cylinder by arranging a lever which moves the valve to be
acted on by a guide bar which is curved and which may be grooved or slotted
like an ordinary valve-motion link. The guide bar receives a motion from an
eccentric on the crank shaft which eccentric is placed on the same side as the
crank or directly opposite thereto, accordingly as the movement it imparts is or
Or the
is not reversed by the lever between it and the valve spindle.
reciprocation of the guide bar may be obtained in any other suitable manner.

page_text: The guide bar is angularly adjustable, its adjustment determining the extent of
opening or point of cut-off of the valve, whilst the motion due to the eccentric
gives the lead and lap of the valve.
As the cylinder oscillates the end of the valve lever moves along the guide bar
and receives a compound motion partly due to the shape or curvature of that bar
and its angular position and partly due to the reciprocation caused by the
eccentric.
And in order that my said invention and the manner of performing the same may
be properly understood I hereunto append a sheet of explanatory drawings to be
hereinafter referred to and representing an oscillating cylinder as fitted with my
improved valve gear.
Figure, 1, of the drawings is a sectional plan; and
Figures, 2, and 3, are sectional elevations as at right angles to each other.
In these drawings the same reference letters are used to mark the same or like
parts wherever they are repeated.
In the example shown in the drawings the valve spindle, A, the outer end of
which is guided by a bracket, B, fixed on the cover of the cylinder, C, is moved by
one end of a lever, D, centered near its middle in a bearing, E, on the cylinder
cover. The opposite end of the lever, D, has fixed in it a pin, F, which, with a
bush on it can slide in a groove formed on the inner side of a curved guide bar, G.
This guide bar, G, has formed on or fixed to its middle a spindle, H, held in a
bearing in a cross,bar, J, which with two rods, K, fixed to it form a slide which is
guided vertically by the rods, I, working in guide eyes in a fixed bracket, L. The
spindle, H,,has jointed, on it forked ends, M, of the rod, N, of an eccentric, P, on
the crank shaft, Q, this eccentric being to the same ide as the main crank, R, the
motion it imparts being reversed by the lever, D.
The spindle, H, of the guide bar, G, has fixed on its outer end a lever, S, by
which the angular position of the guide bar is adjusted for direction of rotation and
extent of opening, the lever, S, being connected to, any suitable handing mechanism
by a connecting link, T, of sufficient length to avoid the angular position of the
guide bar, G, being objectionably affected by the motion due to the eccentric.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is. to be performed, I declare that, what I
-claim.is:
In the valve gear of an oscillating cylinder arranging the valve lever carried by
the cylinder so as to be acted on by a curved guide bar which is made to reciprocate
by an eccentric to give lead and lap and is adjusted angularly so as, with the
oscillation of the cylinder, to give direction of rotation and extent of opening,
substantially as hereinbefore described.
-Dated this Twelfth day May 1892
EDMUND HUNT,
Applicant's Agent.