Year: 1886

page_text: Date of Application, 30th Apr., 1886.
Complete Left, 11th Dec., 1886.
Complete Accepted, 11th Jan., 1887.
I, CHARLES HORACE BENTON of Victoria Mansions, Victoria Street, London, in the
county of Middlesex, Engineer, do hereby declare the nature of this invention to be
as follows:
My invention consists in an improvement in valve gear which is especially adapted
to that form of steam or fluid pressure engine in which the supply ports accompany
the piston in its reciprocating motion.
I mount a bell-crank lever upon the crank-pin, free to oscillate thereon as a centre.
To one arm of the bell-crank lever I attach a link connected by its other end to the
valve sten. I attach a second link to the second arm of the bell-crank lever and the
other end of this second link I attach to a part of the engine stationary relatively to
the motion of the crank-pin. The second link is free to vibrate. The revolution of
the crank-shaft carries the bell-crank lever around and its centre thus receives the
same reciprocating motion as the piston. At the same time the second link causes the
bell-crank lever to oscillate and the necessary compound motion, necessary to operate
the valves, is thus obtained and is transmitted by the first link to the valve stem.

page_text: Pressure Engines.
I, CHARLES HORACE BENTON, of Victoria Mansions, Victoria Street, London, in the
county of Middlesex, Engineer, do hereby declare the nature of my invention for AN
IMPROVEMENT IN VALVE GEAR FOR STEAM AND OTHER 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 of an improvement in valve gear for steam and other fluid pressure
engines refers to that form of steam or fluid pressure engine in which the supply porta
accompany the piston in its reciprocating motion. In this class of engines the piston
head or a body attached to the piston head is made the steam chest or a part of the
steam chest: connection being made with the boiler, by making the piston head 1
longer than its stroke and admitting steam to the side of the piston, or by a telescopic
tube or trunk attached to the piston head and working through a gland into the
live steam, or a differential engine is made in which the steam presses continually
upon the smaller area of the piston. The valves of such engines must have a
compound motion, as in addition to the motion necessary to open and shut the valves
they must partake of the reciprocating motion of the piston. Such valves have
heretofore been worked by means of tappets situated in the piston head or cylinder
head, by the angular motion of the connecting rod, or have been steam worked
valves such means however do not allow any variation from a fixed distribution of
steam.
My invention provides a valve gear which, while it has the necessary compound
motion, can by change in the relation or dimensions of its relative parts produce any
desired distribution of the motive fluid. My invention consists of a lever mounted on
and moved by the crank and connected by one link to the valve stem and by a second
link caused to oscillate relatively to the crank.
DESCRIPTION OF DRAWING.
The figure represents an end elevation of the crank wrist of a single acting vertical
steam engine. The connecting rod is split in two separate parts and the valve gear is
placed between the two parts. The nearer half of the connecting rod and the nearer
bend of the crank wrist are not shown. 1 is a part of the double connecting rod.
2 is a link which joins the valve stem to the bell-crank lever 3. The bell-crank lever
is made in two parts 3 and 31 so that it can be placed upon a double-bent crank.
4 is the crank, the revolution of which carries around the bell-crank lever 3 and 3¹ so
that the centre of the lever receives the same reciprocating motion as the piston.
5 is a second link, one end of which is joined to the arm of the bell-crank lever and
the other joined to a pair of ears 6 upon the engine frame 7. This second link
causes the bell-crank lever to oscillate and the necessary motion to move the valves
is thus obtained and transmitted by the link 2 to the valve.

page_text: 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 :
1. A valve gear for engines which have their supply ports accompanying the piston
in its reciprocating motion composed of a lever mounted on the crank and two links
one of which moves the valves and the other of which causes said lever to oscillate on
the crank as a centre.
2. A valve gear for engines which have their supply ports accompanying the piston
in its reciprocating motion made substantially as described and represented in the
annexed drawing.
CHARLES HORACE BENTON.