Year: 1888

page_text: I, GEORGE RUSSELL Alpha Works, Motherwell, Lanarkshire, North Britain
Engineer do hereby declare the nature of this invention to be as follows:-
This invention has for its object improvements in reversing gear for hydraulic
motors or engines which produce a rotatory motion, and which are required to revolve
in either direction. The improvements are applicable to single or double acting
engines, where the reciprocating motion of the ram or piston is converted into rotatory
motion of the crank shaft, and where the admission and escape of the water is
regulated by a slide or other reciprocating valve.
According to one modification, the valve spindle has attached to it, by a pin, one
end of a radial bar or link. The further end of this radial bar slides in a segment of
same radius as the length of the radial bar.
At the centre of this segment is a fixed point on which it oscilates, motion being
communicated by a rod from a crank or eccentric on the crank shaft. When the
radial bar is at centre of segment no motion is given to the valve, but if moved to
either end, the valve is moved backward and forward, the motion being reversed when
radial bar is shifted from one end to the other, and consequently the engine revolves
in the opposite direction.
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page_text: 1, GEORGE RUSSELL, Alpha Works, Motherwell Lanarkshire, North Britain
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 :-
My Invention is a simple and effective reversing gear for Hydraulic Motors or
Engines.
According to one modification, as applied to a double acting engine, see Figs.
A is the crank or disc shaft, which revolves in the bearing B. is a disc on this
shaft, fixed eccentrically so that its rim forms an eccentric for working the valve, as
well as a crank for the pin D, which is coupled by the connecting rod E to the piston
rod F. G is the cylinder with casing H, containing an ordinary short slide valve,
working on a face having three ports; the outer ports connecting with ends of
cylinder, the middle port being for the exhaust or return water. J is a cylinder con-
taining a pull back piston, connected to slide valve by a link so as to reduce the
pressure on the valve, and make it easier moved. K is a case containing a piston,
loaded with a spring, communicating with main cylinder, to avoid shocks and undue
pressure, by the yielding of the piston and compression of spring in case K.
The eccentric strap L by its rod M conveys a reciprocating motion to N which
oscilates on a fixed bearing. The quadrant or curved link O is fixed to N and the slot
or opening in it is curved to a radius equal to length of rod P. By means of a rod Q
and suitable mechanism, the rod P can be moved to P, which shifts the slide valve to
opposite position, and so reverses the engine. The rod P might be attached direct to
slide valve spindle, but by preference it is made to vibrate a lever on fixed centre R,
and give motion to valve with a reduced stroke as shewn.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, 1 declare that what
I claim is.
The arrangement of reversing gear for Hydraulic Motors, by means of a link and
moveable rod, for actuating the valve regulating the inlet and outlet water to and from
main cylinder, and accessories, substantially as herein described.
Dated this Sixteenth day of January 1889.