Year: 1888

page_text: Date of Application, 17th Jan,, 1888
Complete Specification Left, 15th Oct., 1888
Complete Specification Accepted, 16th Nov., 1888
I WILLIAM SISSON of 10 Florence Place, Falmouth, in the County of Cornwall,
Engineer do hereby declare the nature of this invention to be as follows:-
According to these improvements the slide valve or valves of an oscillating engine
cylinder are operated through a beam mounted on a pivot, which, besides being
carried to and fro by the cylinder, has a reciprocating traverse imparted to it (in a
determined path) by the action of the beam. This traverse of the pivot is employed
for giving motion to the slide valve or valves through suitable mechanism. The
action of the beam for traversing the pivot is produced by the oscillations of the
cylinder, and by connecting the beam at two points with mechanism carried by fixed
parts of the Engine. In the mechanism at one of these points, the connection to the
beam is through a link which is also connected to an arm of a rocking shaft; this
shaft being mounted in bearings on a fixed part of the Engine and being operated
through a rod driven by an eccentric or a crank on the Engine crank shaft. The
mechanism at the other point of connection acts so as to constrain this point to move
in a determined path and is adjustable for the purpose of altering the locus of the
path as required. The eccentric or crank acting through the mechanism described,
oscillates the beam sufficiently to give the required advance for steam admission to
the slide valve or valves at the beginning of each stroke of the Engine; and the
adjustable mechanism referred to, by constraining the movement of the point in the
beam to which it is connected, controls and varies the amplitude and direction of
the oscillations of the beam so as to give any required traverse of the valve or valves
for steam admission for working the engine either forwards or backwards, or so as to
suspend the "steam adinission traverse entirely, according to the conditions of the
adjustment of the mechanism.
1 of Tanna 1888
HY. C. CARON,
Agent for Applicant.

page_text: I WILLIAM SISSON of 10 Florence Place Falmouth in the County of Cornwall
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, and accompanying drawings :-
According to these Improvements the slide valve or valves of an oscillating Engine
cylinder are operated through a beam mounted on a pivot which besides being carried
to and fro by the cylinder has a reciprocating traverse imparted to it (in a determined
path) by the action of the beam. This traverse of the pivot is employed for giving
motion to the slide valve or valves through suitable mechanism. The action of the
beam for traversing the pivot is produced by the oscillations of the cylinder and by
connecting the beam at two points with mechanism carried by fixed parts of the
Engine. In the mechanism at one of these points the connection to the beam is
through a link which is also connected to an arm of a rocking shaft this shaft being
mounted in bearings on a fixed part of the Engine and being operated through a rod
driven by an eccentric or a crank on the Engine crank shaft. The mechanism at the
other point of connection acts so as to constrain this point to move in a determined
path and is adjustable for the purpose of altering the locus of the path as required.
The eccentric or crank acting through the mechanism described, oscillates the beam
sufficiently to give the required advance for steam admission to the slide valve or
valves at the beginning of each stroke of the Engine; and the adjustable mechanism
referred to by constraining the movement of the point in the beam to which it is
connected, controls and varies the amplitude and direction of the oscillations of the
beam so as to give any required traverse of the valve or valves for steam admission
for working the Engine either forwards or backwards or so as to suspend the "steam
admission traverse entirely according to the conditions of the adjustment of the
mechanism.
In the accompanying Drawings Fig. A is a side elevation. Fig. B a front elevation
and Fig. C a plan view of an oscillating marine Engine fitted with valve gear in
accordance with this invention, the various parts of the gear being shown in the
positions corresponding to the top dead centre position of the crank. Fig. D is an
end view of the Engine with the various parts of the gear shown in the positions
corresponding to one of the horizontal positions of the crank. In these Drawings
1 is the bed of the Engine-1ª the entablature-2 the cylinder-3 the trunnion centre
about which the cylinder oscillates-4 the crank shaft-5 the crank-6 the piston
rod 7-8 two valve rods which operate corresponding sliding valves 9 an eccentric on
the crank shaft actuating an eccentric rod 10-11 is the oscillating beam having a
pivot 12 working in a link 13 and having its centre lying in the same transverse
plane in which the axes of the cylinder and the trunnion centre lie-Connected to
the same link are rocking levers 14-15 pivotted to the cylinder at 16-17 respectively―
14 is connected to the valve rod 7 by the link 18 and 15 to the valve rod 8 by the
link 19-20 is the rocking shaft mounted in bearings on the Engine bed 1 and having
2 arms one of which is connected to the eccentric rod 10 and the other to a link 21
which at its other end connects with the oscillating beam 11 at the point 22-23 is a

page_text: vibrating pillar the upper end of which is connected to the oscillating beam 11 at
the point 24 and the lower end to a sliding block which can be traversed to and fro
in a curved guide 25 fixed on the Engine bed by means of a link 26 operated through
a crank disc 27-The crank dise 27 is rotated by a reversing Engine which is not
shown in the Drawings. When the Engine is working the pivot 12 actuated by the
cylinder oscillates to and fro with the longitudinal plane already referred to (the
rocking levers 14-15 and link 13 serving as a parallel motion for maintaining it.
therein) and has also an up and down movement in that plane imparted to it by the
action of the oscillating beam produced as follows: -The eccentric 9 operating
through the eccentric rod 10 rocking shaft 20 and link 21 oscillates the beam 11.
about the point 24 so as to produce an up and down movement of the pivot 12 which
transmitted through the link 13 rocking levers 14-15 links 18-19 and valve rods 7-8
gives the requisite lead to the sliding valves at each end of the piston stroke; and
the vibrating pillar 23 constrains the point 24 to move in such a manner (except
when the sliding block in the curved guide 25 is at mid traverse) that from this cause
the beam acts so as to produce an up and down movement of the pivot 12, which
transmitted as already described imparts to the sliding valves the requisite traverse
for steam admission and "cut off." The locus of the path traversed by the point 24
varies for each position of the sliding block; when this is in mid position very little or
no traverse of the slide valves takes place except for giving the lead, when it is at
one side of the mid position, traverse is imparted to the slide valves for affording
steam admission (to an extent depending upon the distance of the sliding block from
the mid position) for driving the Engine in one direction, and when it is at the other
side of mid position a like result follows for driving the Engine in the opposite
direction.
Figs. E F and G show three alternative arrangements of the oscillating beam and
its connections, similar parts being designated by the same numbers as in Figs. A B C
and D. Figs. H and E each show another alternative method of determining the
locus of the path of point 24 according to which a rocking curved guide 28 is
introduced instead of the combination of 23 and 25-this guide is mounted in
bearings fixed on the Engine bed, and is rocked when required by the reversing
gear through a link 29 and arm 30. A sliding block carrying the pivot at the
point 24 of the oscillating beam 11 traverses to and fro in this guide when the
Engine is working and determines the locus of the path of point 24. It is obvious
that other methods than the one shown may be employed for transmitting the up
and down motion of the pivot 12 to the sliding valves.
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 an oscillating Engine with a sliding valve or valves the employment of an
oscillating beam 11 having its action so directed and controlled at two points 22-24
as to produce at a third point of the beam where the pivot 12 is connected to it
movements which may be transmitted through suitable mechanism for operating the
slide valve or valves substantially as shown and described.
2. The arrangement of Valve gear substantially as shown in Figs. A. B. C. D.
3. The arrangement of Valve gear substantially as shown in Fig. E and described.
4. The arrangement of Valve gear substantially as shown in Fig. F and described.
5. The arrangement of Valve gear substantially as shown in Fig. G and described.
Dated this 11th law of October 1888
HY. C. CARON,
Agent for Applicant.