Improvements in Valve Gear for Fluid Pressure Engines.
Year: 1897

page_text: Date of Application, 9th Sept., 1897-Accepted, 4th Dec.,
1897
COMPLETE SPECIFICATION.
Improvements in Valve Gear for Fluid Pressure Engines.
I, FRANZ SCHOENEBERGER, of 12 Hackstrasse, Kaiserlautern, in the Empire of
Germany, 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:-
This invention relates to vaive gear for fluid pressure engines which is simple in
construction, reliable and easily regulated, as I shall describe referring to the
accompanying drawings.
Fig. 1 represents in side view, end view and plan a direct acting pumping engine
with valve gear according to this invention.
Fig. 2 is a vertical section of the steam valve box with plan of the lower end of the
slide valve, which is shewn in its up position.
Fig. 3 is a side view of the valve box with half plan of its cover.
Fig. 4 is a vertical section of the valve box with the slide valve in its down
position.
Fig. 5 is a section on a plane at right angles to that of Fig. 2.
Figs. 6 and 7 are side elevations and plans of the upper part of the slide valve, and
section plans of the slide valve and valve box.
Figs. 8 and 9 are sections and sectional plans of the valve for the pump.
Fig. 10 is a plan of the steam cylinder and tappets.
Fig. 11 shews sections of the engine and pump valve boxes indicating the connection
of the slide valves.
The working fluid, which may be steam, water under pressure or compressed air,
enters the valve box B through the inlet e² and thence passes by the passages a and a¹
to the right and left ends respectively of the cylinder. In the valve box B is fitted to
slide a piston valve C which operates as follows:-
The piston valve C being in its high position as shewn in Figs 2 and 5, fluid
entering by e² flows by passage b to the slit d in the piston Cand presses the piston C
down to its low position shewn in Fig. 4.
In the narrow part of the piston C are slits f and f¹ which according as the piston
is down or up make connection of the inlet e to the passages a a¹ leading respectively
to the two ends of the cylinder.
Thus when the slide is down (Fig. 4) fluid passes from e² by f and a to the right
end of the cylinder; the slit f¹ at the same time makes connection of the passage a¹
from the left end of the cylinder to an interior hollow g of the slide valve and the
exhaust fluid escapes by a¹ f¹ and g.
In order that the fluid under the piston C may escape when the piston descends a
slit e¹ in the piston puts the space under the piston in connection with an escape
passage 61.
As the piston of the cylinder A moves to the left a tappet k on a rod 8 t which is
connected to and moves with the piston, strikes the lever h which is fixed on the
piston C turning C to the position shewn in Figs. 2, 5 and 6. The slit d' is then brought
to the inlet e², so that the fluid flowing through 6 into d¹ presses up the piston to the
position shewn in Figs. 2 and 5 so that by the slits ƒ2 and ƒ³ exhaust passes from

page_text: the right end of the cylinder by a and f³ to g, while fluid passes to the left end of
the cylinder by f' and a¹.
As the piston of the cylinder A then makes its stroke to the right the tappet k
acts on ½ turning the slide valve partly round and thus reversing the distribution of
the working fluid.
By a lever H one arm of which is attached to the rod of the slide valve C and the
other to the slide valve T of the pump this slide valve is moved up and down so that
slits in it as shewn in Figs. 8, 9 and 11 alternate the passage of fluid to and from the
ends of the pump cylinder P.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
Valve gear for a fluid pressure engine having a piston valve partly turned by
tappets worked by the piston of the engine so as to present slits in which the working
fluid acts to move the valve alternately up and down thereby governing ports which
put the ends of the main cylinder alternately in communication with the supply and
exhaust, substantially as described.
Dated this 9th day of September 1897.