Improvements in Valve Gear or Apparatus for Operating and Controlling the Distributing Valves of Fluid Pressure Engines.
Year: 1884

page_text: Improvements in Valve Gear or Apparatus for Operating and
Controlling the Distributing Valves of Fluid Pressure Engines.
I JAMES BEVERIDGE of Soho Foundry Barrow in Furness in the County of
Lancaster Engineer, do hereby declare the nature of my invention for "IMPROVE-
MENTS IN VALVE GEAR OR APPARATUS FOR OPERATING AND CONTROLLING THE
DISTRIBUTING VALVES OF FLUID PRESSURE ENGINES," to be as follows:-
My Invention has for its object the provision of simple mechanism for working
the distributing valves of all kinds of Reversing Steam Engines whether Marine,
Stationary, Locomotive, Winding and Hauling Engines, Cranes Winches or the
like, whereby I am enabled to dispense with all eccentrics and link motion and
rods connected with the working of the same and to reverse the engine with one
and the same set of mechanism.
In carrying out my Invention in order to effect this object I employ a frame,
bracket or pair of links mounted loose at one end on the crank shaft so as to be
capable of being moved around the same; and connected at its opposite end to the
rod of any suitable description of reversing gear such for example as any one of
those in common use. In the frame, bracket or links, is mounted loose, so as to be
capable of turning freely, a spur wheel carrying a pin which is connected either direct
to the rod of the slide valve or to a lever for working such valve rod; and with the
Baid spur wheel engages another spur wheel (either split or solid) fast on the crank
shaft. As the spur. wheel carried by the frame, bracket or pair of links receives
rotary motion from the spur wheel on the crank shaft the slide valve is operated
with the requisite amount of lap and lead; whilst by the act of moving the frame
bracket or links around the crank shaft the engine will be reversed.
It is obvious that the arrangement of the gearing may be slightly modified and
that the frame, bracket or links with their connections may be somewhat varied
without departing from the principle of the invention.
The invention is also applicable to engines operated by other motive fluids than
steam.

page_text: Improvements in Valve Gear or Apparatus for Operating and
Controlling the Distributing Valves of Fluid Pressure Engines.
1 JAMES BEVERIDGE of Soho Foundry, Barrow in Furness in the County of
Lancaster, Engineer, do hereby declare the nature of my invention for "IMPROVE-
MENTS IN VALVE GEAR OR APPARATUS FOR OPERATING AND CONTROLLING THE
DISTRIBUTING VALVES OF FLUID PRESSURE ENGINES" and in what manner the
same is to be performed, to be particularly described and ascertained in and
by the following statement:-
My invention has for its object the provision of simple mechanism for working
the distributing valves of all kinds of reversing steam engines, whether Marine,
Stationary, Locomotive, Winding and Hauling Engines, Cranes, Winches or the
like, whereby I am enabled to dispense with eccentrics and link motion and rods
connected with the working of the same, and to reverse the engine with one and
the same set of mechanism.
In carrying out my Invention in order to effect this object I employ a pair of
links or a frame (equivalent to the pair of links) loosely pivotted at one end on or
concentric with the crank shaft so as to be capable of being moved around the
same; and connected at its opposite end, or at any other convenient point, to the
rod of any suitable description of reversing gear, such for example as any one of
those in common use. In the links or frame is mounted loose, so as to be capable
of turning freely therein, a toothed wheel carrying a pin which is connected either
direct to the spindle of the slide valve or to a lever for working such valve spindle,
and with the said toothed wheel engages another toothed wheel (either split or
solid) fast on or receiving motion from the crank shaft. As the toothed wheel
carried by the links or frame receives rotary motion from the toothed wheel on or
driven by the crank shaft, the alide valve is operated with the requisite travel
whilst by the act of moving the links or frame around the crank shaft the engine
will be stopped or reversed.
It is obvious that for operating two slide valves the pin carried by the loose
toothed wheel and its connections are duplicated.
And in order that the said Invention may be perfectly understood, I shall now
proceed more particularly to describe the same and for that purpose shall refer to
the two figures on the accompanying sheet of drawings the same letters of reference
indicating corresponding parts in both the figures.
Figures 1 and 2 represent elevations taken respectively at right angles to each
other of valve gear constructed according to my Invention for actuating and
reversing two slide valves, the reversing lever or its equivalent and the slide
valves being omitted from the figures as unnecessary to the elucidation of the
description.
A A are a pair of links mounted loose at one end on the crank shaft B so as to
be capable of being moved around the same; and connected at their opposite end
(or at any other convenient point) to the rod C of any suitable description of
reversing gear such for example as the ordinary reversing lever for small engines;
or in the case of large engines an auxiliary steam cylinder, screw gearing or

page_text: hydraulic apparatus may be employed for moving the links around the crank shaft
in order to stop or reverse the engine, the rod C being suitably connected to the
operative device of such power mechanism so as to be moved thereby, after the
manner of reversing ordinary eccentrics and link motion as will be well understood.
Between the two links A A is mounted, so as to be capable of turning freely in
such links, a spur wheel D, with which engages another spur wheel E (either split
or solid) fast on the crank shaft B. The wheel D, the boss or spindle of which has
its bearings in and passes through the links as shewn clearly by dotted lines,
carries two pins a a¹ (in the case of there being only one valve one pin only would
be required) which pins are either connected direct to the spindles 6 61 for
transmitting motion to the slide valves, or are connected to levers for working such
valve spindles.
This improved valve gear operates in the following manner :-
As the spur wheel D carried by the links A, A, receives rotary motion from the
spur wheel E on the crank shaft B, the requisite travel of the slide valves is
obtained, whilst by the act of moving the links A. A around the crank shaft from
the position 1 to the position 3 (Figure 1) or vice versa, as the case may be, the
engine will be reversed, the neutral condition or state of rest being when the links
are placed in the position 2.
In the position of the parts shewn in the drawings, the slide valve corresponding
to the pin a is just opening for the inlet of the steam whilst the slide valve
corresponding to the pin a¹ is very nearly closed.
In lieu of the links A, A a frame consisting substantially of the two links
combined together in one may be employed.
The Invention is also applicable to Engines operated by other motive fluids than
steam.
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
The combination of the links A A, or frame equivalent thereto, loosely pivotted
on or concentric with the crank shaft, the gear wheel D carried by such links or
frame so as to be capable of turning freely therein and having connections with the
valve or valves, and the gear wheel E fast on or receiving motion from the crank
shaft, all substantially as and for the purpose hereinbefore described.
D: 10L 1
Dated this
19th
day
1885.
TH J. HANDFORD,
Agent,
42, Southampton Buildings, London, W.C.