Improvements in Valve-gear of Pumping Engines.
Year: 1889

page_text: Date of Application, 28th Feb., 1889
Complete Specification Left, 26th Nov., 1889-Accepted, 28th Dec., 1889
PROVISIONAL SPECIFICATION.
Improvements in Valve-gear of Pumping Engines.
JOHN EDWARD ROGERS Sycamore Road Smethwick in the County of Stafford,
Engineer do hereby declare the nature of this invention to be as follows:
My Improvements relate to that class of Engine known as the Duplex or
Worthington Type which in design are as two Pumping Engines working side by
side and one Pumping Engine Piston Rod actuating the Slide Valve of the other.
The arrangement of my improvements on the Valve Gear of the two Engines
would be as follows:-
In the Pedestal situated in the required position between the Steam and Water
cylinders for carrying the cross shafts that receive motion from the Piston Rods of
the Pumping Engines, and impart it to the Slide Valve through suitable Gear I
arrange specially constructed cross shafts as follows. The end of the cross shaft that
takes its movement from the Piston Rod is constructed with what may be called for
the purpose of this description a suitably shaped Boss which is bored out at right
angles with the axis of the cross shaft to receive a rod which is to form part of what
for the purpose of this description, is called the long lever which takes its motion from
the piston rod and gives it to the cross shaft which cross shaft at the Slide Valve End
is fitted with short lever and connections for working the slide Valve in the usual
manner.
The part of the long lever that is fitted into the Boss of the cross shaft is free to
slide through it as required, the lower part of the cross shaft lever or that part where
the connection is to be made to enable it to take up the motion from the Piston Rod
is constructed with an eye that fits in to a jaw fixed securely on the Piston, a Pin
passing through the jaw and eye attaches it to the Piston Rod in such a manner that
any motion of the piston rod is transmitted through the cross shaft to the Slide Valve
in the following manner.
The movement of the Piston Rod causes the long lever to slide through the Boss or
axis of the cross shaft and changes the position of the Slide Valve as required.
1 may make the fixed jaw on the Piston Rods with adjustable holes for adjusting
purposes when required in the working of the pump.
I have described the Gear from one Piston Rod but it must be understood as
applying to the two and may be varied in design without interferance with the
principle of my Invention.
Dated this 97th day of Februar 1889
COMPLETE SPECIFICATION.
Improvements in Valve-gear of Pumping Engines.
JOHN EDWARD ROGERS Sycamore Road Smethwick in the County of Stafford
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:-
Fig. 1 is sectional elevation, Fig. 2 sectional end view through A B of Fig. 1
and Fig. 3 plan of what is known as the Worthington or Duplex type of pump and
my Invention consists of a method or construction of Gear for operating the slide
Valves of the Steam cylinders. It is therefore needless to describe the whole of the
parts of the Engine other than the Gear that relates to my Invention.
Like letters refer to like parts in each Fig. C and are the sliding levers,
D and D¹ are the clip joints, to which sliding levers C and C¹ are jointed by pins E

page_text: and C¹.
and E¹. F and F¹ are extra holes in clip joints for adjustment of sliding levers C
G and G¹are cross shaft eyes through which sliding levers C and C¹ work.
Hand H¹ are jaws fixed on the ends of cross shafts Land 1. J and Jare con-
necting rods connecting the Valve Gear with Slide Valve Spindles M and M'.
The dotted lines shew position of Valve Gear at each end of the stroke of the
pump. The action of the Valve Gear is as follows.―
Suppose the Piston Rod of pump to be at one end of the stroke, in moving to
the opposite end, it carries with it the clip joint D in which is jointed the sliding
lever C, this sliding lever gives a partial rotary movement to the cross Shaft L
which moves the jaw H sufficient to give the required motion to the slide Valve of
the duplicate engine. Each engine in turn giving motion to the Slide Valve of the
other through the Gear as described and shewn.
The various parts of the Gear may be differently designed without departing from
the nature of my Invention.
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.-
The joints D and D₁ in combination with sliding levers C and C1 sliding lever
cross shaft eyes G and G¹ cross shaft L and L'. Jaws H and H' giving motion to
the slide Valves through the connecting rods J and J.and Valve rods M and M¹
substantially as shewn and described.
Dated this 23rd day of November 1889.
JOHN EDWARD ROGERS.