Improvements in or relating to Valve Gearing for Steam or other Engines.
Year: 1896

page_text: Date of Application, 26th June, 1896
Complete Specification Left, 24th Mar., 1897-Accepted, 19th June, 1897
PROVISIONAL SPECIFICATION.
Improvements in or relating to Valve Gearing for Steam or
other Engines.
We, THOMAS PATTINSON of 39 Elmore Road, Engineer, and THOMAS SLATER
of 2 Daniel Hill Street, Engineer, both of Sheffield, in the County of York, do
hereby declare the nature of this invention to be as follows:-
The object of our improvements in or relating to valve gearing for steam engines,
or the like, is to provide a simple and efficient form of trip gearing for economically
working the valves. According to our invention we construct a revolving cam
fixed on a spindle by any suitable means, and in connection therewith we form a
collar and groove or recess, suitable for receiving the ordinary lever from the
governor, and on the cam which is preferably of cast iron, we affix a steel face or
tappet of any suitable form, so that on the cam being revolved with the spindle the
face of the cam or steel tappet comes in contact with an angular or curved
projection affixed at the end of one or more trip levers, which causes the lever or
levers to oscillate and being fixed on a fulcrum the other end of the lever or levers
are moved into the opposite direction, carrying with them a connection from one
trip lever to the other. To the said connection a lever or crank is fastened by a.
pin or otherwise; it operates on a lever or crank which is attached to the valve
spindle and regulates the valve which is preferably of the "Corliss" type.
On the cam revolving to the other or opposite trip lever, the action is the reverse.
When the lever of the governor operates on the groove or recess of the cam it.
causes either a forward or backward motion of the cam. The steel face or tappet...
projection on the cam is thus regulated to strike or come in contact earlier or later.
with the trip lever projections thus giving more or less action to the valve and
obtaining an efficient cut off, and by means of our cam we not only secure a rapid
charge of steam but also obtain a rapid cut off as well as keeping the exhausti
well open to nearly the end of the piston stroke.. We do not bind ourselves to:
one type of valve as we can adapt. our iuvention to any new or existing engines.
as may be suitable.
Dated this 26th day of June 1896.
COMPLETE
Improvements in or relating to Valve Gearing, for Steam or
other Engines.
We THOMAS PATTINSON of 39 Elmore Road, Engineer, and THOMAS SLATER
of 2 Daniel Hill Street, Engineer, both of Sheffield, in the County of York, 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 valve-operating gear for steam or other engines, its

page_text: working the valves.
In the accompanying drawings
Figure 1 is a front elevation of the improved gearing.
Figure 2 is a side elevation of the same.
Figures 3 and 4 are respectively an end view and side elevation of the tappet-
operating cam.
Like letters indicate like parts throughout the drawings.
The engine cylinder A is provided with the usual steam and exhaust ports and
on their faces is applied a Corliss valve box B of the ordinary type; the spindle C
of the valve C is preferably arranged so that it rests in a bracket D of suitable
shape fastened to the valve box B or in some other convenient position.
On the spindle C¹ is fixed a cheek or other lever E which is fastened by a pin E,
screw or other means to a connecting link or the like F and within this link is
placed one part of the levers G which are fulcrummed at H to a bracket K attached
to the valve box B by flanges K. Tappet levers L carry on their ends adjustable
tappets L, and on the top of the bracket K is fastened another bracket M with
flange M by which it is attached to the flange K2 of the bracket, K. At one end
of the bracket K is formed a boss or bearing K³, and on the opposite end of the
bracket M is arranged another boss or bearing M. A square spindle N, the ends
of which are turned down to fit the bearings K and M2, carries a collar P and
bevel wheel O; and also upon the squared portion of the spindle a cam R which is
preferably formed taper with suitable curvature and grooved to suit a governor
lever. These parts are put together by first inserting one end of the spindle N
into the bearing K³, and then passing the other end into the bearing M2 and
attaching the bracket M in position by means of the flanges M and K. The
spindle N is rotated either through the bevel wheel O or by means of chain or
other gearing from the inain shaft and causes the cam R to revolve, the movement
of the latter being arranged to be in correct relation to the speed of the engine.
The governor receives its motion in some suitable manner, and controls the cam R
through a lever engaging with a groove in the latter by causing the cam to have
an inward outward or other motion by which means the admission of steam owing
to the action of the cam upon the tappets L is varied. Movement of the tappets
owing to the cam coming in contact with them earlier ór later is imparted through
the levers to the valves, the action of which is varied so as to enable a rapid
admission of steam to be obtained as well as a quick cut off, while allowing of the
exhaust being open nearly to the end of the stroke. It is obvious that the position
of the trip arrangement may be varied, as also the shape of the adjustable
tappets L and the taper or curvature of the cam. The latter may be cast in one
piece or a steel face of suitable form may be fixed to it as desired. The usual dash
pots may be utilized if convenient.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. In a valve-operating gear the combination with a Corliss valve of a tapered
cam such as R substantially as and for the purpose-described.
2. In a valve-operating gear the combination with a spindle such as N of
levers such as L and a cam such as R adapted to be moved endwise by a governor
For the purpose specified.
1
3. In a valve-operating gear the combination with a Corliss valve of a cam
such as R, spindle N, tappets such as L¹ and operating levers, substantially, as
described.
4. In a valve-operating gear the combination with a Corliss valve of a lever E,
link F, levers G and tappets L', substantially as described and illustrated in the
accompanying drawings.
5. The combination and arrangement of parts constituting the complete

page_text: valve-operating gear substantially as described and illustrated in the accompanying:
drawings.
BOULT & WADE,
Agents for the Applicants..