Improvements in or relating to Valve-gear of Motive-power Engines.
Year: 1889

page_text: Date of Application, 15th Nov., 1889
Complete Specification Left 13th Sept., 1890-Accepted, 1st Nov., 1890
PROVISIONAL SPECIFICATION.
Improvements in or relating to Valve-gear of Motive-power
Engines.
We, CHARLES FREDERICK DIXON, of The Cleveland Bridge and Engineering Company
of Darlington in the County of Durham Engineer and WILLIAM NATHAN DACK, of
10 Byron Street, Patricroft in the County of Lancaster, Engineer, do hereby declare
the nature of this invention to be as follows:-
The first part of our invention relates to slide valves and we propose to connect the
valve rod to the valve so that the axis of the rod is as nearly as possible in a line with
the working face of the valve our object being to reduce friction and to obviate the
rocking motion which is imparted to the valve when the rod is attached to its back as
now customary; the second part of our invention relates to trip valve gear our object
being to make the trip action more certain.
In performing the first part of our invention we propose to divide the admission
and exhaust ports into two parallel lines with a recessed space between them; the
valve formed in one piece has its two working faces connected by a curved portion
which when the valve is in position forms with the recess before mentioned a circular
or other shaped opening to receive the valve rod which is connected to projections
cast on the valve and open at the bottom so that the valve can be lifted clear of the
valve rod without removing the latter; by this arrangement the axis of the rod and
the working faces of the valve are brought as nearly as possible in the same plane or
on the same centre line.
In small engines or in engines where a single admission or exhaust port is
employed I propose to cast with or secure to the valve a pair of lugs or ears on
opposite sides and at right angles and about central with the axis of the valve
rod, studs or projections on these lugs are prepared to receive links which are also
connected to the valve rod; or in place of links the valve rod can be forked and its
ends fitted on the studs of the ears, so as to bring the valve rod and valve face in
the same plane.
Our improved trip valve gear consists of a har supported on links fulcrumed on
fixed centres and reciprocated by an eccentric on the crankshaft. At each end of
this reciprocating bar is a catch attached to the oscillating valve lever which is the
same length as the above named links so that the bar and the catches reciprocate
together until a catch is released by a toe piece or equivalent actuated by the
governor and the valve controlled thereby closed by a spring or equivalent.
Dated this 14th day of November 1889.
H. B. BARLOW,
Agent for Applicants.
Improvements in or relating to Valve-gear of Motive-power
Engines
We, CHARLES FREDERICK DIXON, of The Cleveland Bridge and Engineering Company,
of Darlington, in the County of Durham, Engineer, and WILLIAM NATHAN DACK,
of 10 Byron Street, Patricroft, in the County of Lancaster, 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 :-
The first part of our invention relates to slide valves and we propose to connect

page_text: the valve rod to the valve so that the axis of the rod is as nearly as possible in a line
with the working face of the valve our object being to reduce friction and to obviate
the rocking motion which is imparted to the valve when the rod is attached to its
back as now customary; the second part of our invention relates to trip valve gear
our object being to make the trip action more certain.
And in order that our invention may be fully understood and readily carried into
effect we will describe the accompanying two sheets of drawings reference being had
to the figures and letters marked thereon.
Figure 1 is a cross section and
Fig. 2 a plan illustrating the application of our invention to a slide valve.
Figs. 3 and 4 are similar views respectively to Figs. 1 and 2 but showing a slide
valve with two spindles.
Fig. 5 is a cross section.
Fig. 6 a longitudinal section and
Fig. 7 a plan illustrating the application of the first part of our invention to a valvo
operated by a valve rod which has an axial reciprocating motion.
Fig. 8 is a side elevation of the cylinder of an engine showing our improved trip
valve gear according to the second part of our invention.
In performing the first part of our invention as illustrated by Figs. 1 and 2 we
propose to divide the admission and exhaust ports a a into two parallel lines with
a recessed space between them, the valve e formed in one piece has its two working
faces connected by a curved portion which when the valve is in position forms with
the recess b before mentioned a circular or other shaped opening to receive the valve
rod d which is connected to the projections c' cast on the valve and open at the
bottom so that the valve can be lifted clear of the valve rod without removing the
latter by this arrangement the axis of the rod and the working faces a¹ of
the valve are brought as nearly as possible in the same plane or on the same
centro line.
C
In Figs. 3 and 4 the valve c is provided with two lugs or ears e on opposite sides,
placed in line with the valve face a¹, the valve spindles d' d¹ are connected to the
lugs e in such manner that the axis of the valve spindles and the working face a¹
of the valve are brought as nearly as possible in the same plane or on the same
centre line.
In Figs. 5, 6 and 7 the valve c is provided with two lugs e in which are fitted
studs e¹ the centres of which are in the same plane as the working face a¹ of the
valve c; to the studs e' are pivoted links f connected to studs g actuated by levers /
secured to the valve rod d, so that the axial movement of this valve rod causes the
valve c to be moved from points in line with its working face.
Our improved trip valve gear illustrated by Fig. 8 consists of a bar m-supported
on links m fulcrumed on fixed centres i and reciprocated by a rod joperated by an
eccentric on the crankshaft. At each end of this reciprocating bar is a catch n
attached to the oscillating valve lever o which is the same length as the above named
links m so that the bar m and the catches n reciprocate together until a catch n is
released by a toe piece p or equivalent actuated by connections, not shown, from the
governor and the valve controlled thereby closed by a spring enclosed in a box q or
by equivalent means.
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 :-
1. The combination with a recess (or recesses) in the cylinder or steam chest, of
a projection (or projections) on the valve whereby the valve mover can be connected
to the valve at or about the level of its working surface.
2. The improved trip valve gear consisting of the bar m carried by links equal or
nearly so in length to the valve levers for the purpose of ensuring a parallel traverse
with the valve lovers.

page_text: 3. The general arrangements of parts embodying our improvements in valve gear
substantially as herein set forth.
Dated this 12th day of September 1890.
H. B. BARLOW,
17, St. Ann's Square, Manchester, Agent for Applicants.