Improvements in the Valve Gear of Winding and Hauling Engines.
Year: 1895

page_text: Date of Application, 15th Mar., 1895
Complete Specification Left, 12th Dec.. 1895-Accepted, 25th Jan., 1896
PROVISIONAL SPECIFICATION.
Improvements in the Valve Gear of Winding and Hauling
Engines.
We, HARGRAVE WALTERS, of Woodhouse near Sheffield, in the County of
York, Colliery Manager, and GEORGE THORNLEY, of Burton-on-Trent in the
County of Stafford, Engineer do hereby declare the nature of this invention to be
as follows:-
This invention relates to improved means for operating the valve eccentries of
winding and hauling engines so that a suitable lead can be given to the said valves
and the engines be worked at a greater speed than hitherto whilst economy in the
consumption of steam and consequently of fuel is obtained.
According to our invention we provide. means whereby the eccentrics, by which
the valve or valves of the engine is or are operated can be adjusted relatively to
each other in position on the crank axle so as to impart the required lead to the
valve or valves for the time being in operation.
To effect this we provide on a stud carried by the shaft and situated between
the eccentrics a T or three armed lever two of which arms engage in openings or
recesses in each of the eccentrics whilst the third arm is connected by a rod to a
sleeve capable of being slidden along the shaft by any suitable means for example
by a foot lever or treadle.
By the movement of the sleeve along the shaft in one direction the three armed
lever will be turned on its stud and move the eccentrics relatively to the position
of the crank so as to bring the eccentric operating the valve or valves forward.
thereby giving the desired lead to the said valve or valves.
Dated this 15th day of March 1895.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents..
COLELE DI ECIFICATION.
Improvements in the Valve Gear of Winding and Hauling
Engines.
We, HARGRAVE WALTERS, of Woodhouse, near Sheffield, in the County of
York, Colliery Manager, and GEORGE THORNLEY, of Burton-on-Trent, in the
County of Stafford, Engineer, do hereby declare the nature of our 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 improved means for operating the valve eccentrics of
winding and hauling engines so that a suitable lead can be given to the said valves
and the engines be worked at a greater speed than hitherto whilst economy in the
consumption of steam, and consequently of fuel, is obtained.
According to our invention we provide means whereby the eccentrics by which
the valve, or valves, of the engine is, or are, operated, can be adjusted, relatively
to each other, in position on the crank axle, or shaft, or on an axle, or shaft, driven
| Pains Rd |

page_text: therefrom, so as to impart the required lead to the valve, or valves, which is, or are,
in operation.
We will describe our invention with reference to the accompanying drawing,
Figure 1 representing a shaft with two pairs of eccentrics, each provided with a
device according to this invention, Figure 2 being part section drawn to a larger
scale of the device applied to one pair of eccentrics, and Figure 3 being a view, at
right angles thereto.
It is understood that the arrangement shewn in Figure 1 is for a pair of
engines as generally used and that a single engine would have one pair of such
eccentrics.
According to our invention we provide a T, or three-armed lever a mounted on
a stud b carried by the shaft c whether the crank shaft, or a counter-shaft. It is
shewn as a counter shaft driven at the same speed as the crank shaft of the engine.
The stud is situated between the eccentrics d and d². Two of the arms of the
said or three armed lever a have projections a² which engage in openings, or
recesses, in each of the eccentrics whilst the third arm is connected by a rod f to a
sleeve 9 capable of being slidden along the shaft c by any suitable means, for
example by a foot lever or treadle or hand wheel and quick threaded screw which
conveys movement to the forked lever h provided with pins h² which engage with
the annular groove g² in the said sleeve g.
The engagement of the projections a² of the arms of the lever a can be effected
by making the said projections of circular or spherical form to engage in corre-
sponding recesses in cylindrical pieces d³ let into corresponding holes in the
eccentric sheaves.
By the movement of the sleeves g along the shaft c by the mechanism provided
for the purpose, the three armed lever a will be turned on its stud b and adjust the
eccentrics d and d2 relatively to the position of the crank so as to bring the
eccentric operating the valve or valves, forward, thereby giving the desired lead
to the said valve or valves. In Figure 1, the levers fand a which are applied to the
right hand pair of eccentrics are concealed they being at the far side of the
shaft.
The invention is applicable to engines generally for winding and hauling whether
stationary, or locomotive.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. In valve gear of engines of the kind referred to the combination with the
valve operating eccentrics of means for adjusting them, substantially as, and for
the purpose, herein before described.
2. In valve gear of engines of the kind referred to, a lever centered between the
eccentrics and engaging therewith and also connected to a sleeve capable of being
slidden along the shaft to effect the adjustment of the eccentrics substantially as,
and for the purpose, hereinbefore described.
3. The arrangement and combination of parts constituting the adjusting
mechanism substantially as and for the purpose hereinbefore described.
Dated this 12th day of December 1895.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents..