Improvements in Valve-gear for Locomotive and other Engines.
Year: 1892

page_text: Date of Application, 26th May, 1892
Complete Specification Left, 31st Jan., 1893-Accepted, 8th Apr., 1893
PROVISIONAL SPECIFICATION.
Improvements in Valve-gear for Locomotive and other Engines.
I, HENRY HAWKSHAW CARRICK, of 15, Gosforth Terrace, Gosforth, Newcastle-
on-Tyne, in the County of Northumberland, Draughtsman, do hereby declare the
nature of this invention to be as follows:-
This invention relates to gear for working the valves of locomotive, marine and
other engines; its objects being to actuate the valve-gear from the cross-heads
instead of from eccentrics on the crank-shaft, or from the connecting rods, as in
what is known as Joy's gear, to combine the motions of both cross-heads for
operating each valve, and to provide a reversing shaft which is not influenced by
the movement of the bearing-springs.
In applying my invention, by way of example, to a locomotive having two
cylinders, the gear I employ for actuating the valve of one of the cylinders is of
the following description:-Beneath or above the cross-head guides, I arrange two
transverse rocking shafts. The cross-head is linked to the end of an arm keyed to
the first shaft. This shaft also carries another arm linked to the end of the long
arm of a lever pivoted to a block sliding between guides in a movable quadrant ;
the short arm of the lever being connected to the valve-spindle. The cross-head
of the other cylinder is linked to the end of a lever mounted loosely on the first
shaft this lever being also linked to an arın keyed on the second transverse shaft.
The latter is furnished with another fast arm, which is connected to the pin on
which the valve-spindle is pivoted. Thus the valve-spindle is rocked from the
cross-head pertaining to the piston-rod of its cylinder, and is at the same time
raised and lowered from the cross-head of the piston-rod of the other cylinder.
Reversing is effected by altering the inclination of the guides. The valve for the
other cylinder is operated in a similar manner. The valve-spindle lever is linked
to and rocked by the lever which is mounted loosely on the first transverse shaft...
The sliding block to which the valve-spindle lever is pivoted is raised and lowered
by a bell-crank lever mounted loosely on the second transverse shaft; one arm of
this lever being connected to the cross-head of the piston-rod of the first cylinder,
and the other arm to the pin on the sliding block.
If the engine have only one cylinder, an eccentric on the crank-shaft set at right
angles to the crank may be used for rocking the second transverse shaft.
Instead of two transverse rocking shafts, only one may be employed. In this
case, the guides are inclined in opposite directions; that is, when the engine is
running forward, one guide is inclined in one direction and the other guide in the
contrary direction, the two guides crossing each other for reversal.
Dated the 26th day of May 1892.
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C., Chartered Patent Agent.
COMPLETE SPECIFICATION.¨
Improvements in Valve-gear for Locomotive and other Engines.
I, HENRY HAWKSHAW CARRICK, of 15, Gosforth Terrace, Gosforth, Newcastle-
on-Tyne, in the County of Northumberland, Draughtsman, 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 gear for working the valves of locomotive, marine and
other engines; its objects being to actuate the valve-gear from the cross-heads

page_text: instead of from eccentrics on the crank-shaft, or from the connecting rods, as in
what is known as Joy's gear, to combine the motions of both cross-heads for
operating each valve, and to provide a reversing quadrant-shaft which is not
influenced by movement in the bearing-springs.
In the accompanying digrams,
Fig. 1 represents, partly in section and partly in side elevation, the right-hand
cylinder, valve, piston, piston-rod, cross-head, connecting rod and valve-actuating
mechanism pertaining to a locomotive or other engine having two cylinders and
cranks at right angles to one another.
Fig. 2 being a corresponding view of the left-hand cylinder and accessory parts.
Figs. 3 and 4 are cross sections showing the relative positions of the levers on
the two rocking shafts.
Fig. 5 is a detail view illustrating an alternative mode of construction.
In applying my invention, by way of example, to a locomotive having two
cylinders, the gear I employ for actuating the respective valves is of the following
description Beneath the cross-head guides. A A and A¹ A¹, I arrange two
transverse rocking shafts B and C, which are mounted in bearings supported by
the framework of the engine. The cross-head D is connected by a link E to the
end of an arm F keyed to the shaft B. This cross-head is also coupled by a link G
to the end of the long arm H of a lever H J pivoted to a block sliding between
guides in a movable quadrant-shaft K; the short arm J of the lever being con-
nected to the valve-spindle L by a rod M. The shaft K also turns in bearings
supported by the framework of the engine, and its position with respect to the rest
of the gear consequently remains uninfluenced by movement in the bearing-springs.
The cross-head D₁ of the other cylinder is coupled by a link N (Fig. 2) to the end
of an arm Okeyed on the shaft C. The latter is furnished with another fast
arm P (Fig. 1), which is connected by a link Q to the pin I on which the valve-
spindle lever H J is pivoted. An arm P1 is also keyed on the shaft B, and
connected by a link Q with a pin I¹ on a second sliding block. Thus the valve-
spindle lever H J is rocked or vibrated through the link G from the cross-head D
pertaining to the piston-rod of its cylinder, and is at the same time raised and
lowered or moved transversely through the link N, the arms O and P, and the
link Q from the cross-head D of the piston-rod of the other cylinder. In a similar
manner, the lever H¹ J' is rocked about the pin I' from the cross-head D' through
the link G, and is at the same time raised and lowered from the cross-head D
through the link E, the arms F and P¹, and the link Q. It is connected to the
valve-spindle L' by the rod M¹.
Reversing is effected by altering the inclination of the guides; that is, by
partially rotating the quadrant-shaft K by means of the arm R.
The lever HJ may be coupled by a link F¹ to the lever F, as indicated in
Fig. 5, or to an arm keyed on the shaft B. The lever H'J' may be coupled to
the arm O on the shaft C, or to a lever mounted loosely on the shaft B and con-
nected to the cross-head D'. The sliding block to which the valve-spindle
lever H J is pivoted may be raised and lowered by a bell-crank lever mounted
loosely on the shaft C; one arm of this lever being connected to the cross-head D
and the other arm to the pin I¹.
If the engine have only one cylinder, an eccentric on the crank-shaft set at
right angles to the crank may be used for rocking the second transverse shaft.
Instead of two transverse rocking shafts, only one may be employed. In this
case, the guides are inclined in opposite directions; that is, when the engine is
running forward, one guide is inclined in one direction and the other guide in the
contrary direction, the two guides crossing each other for reversal.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I claim :-
1. The improved valve-gear for locomotive and other engines arranged or
operating substantially as described with reference to the accompanying diagrams.

page_text: 2. In valve-gear for locomotive and other twin-cylinder engines, actuating the
valve for either cylinder through a lever to which a vibratory movement imparted
from the cross-head of its own cylinder and a transverse motion from the cross-
head of the other cylinder, substantially as herein described.
3. In valve-gear for locomotive and other twin-cylinder engines, the employment
of a reversing quadrant-shaft K mounted substantially as herein described and in
such a manner that its position with respect to the rest of the gear is not influenced
by movement in the bearing-springs.
4. In valve-gear for locomotive and other twin-cylinder engines, the combination,
with one cross-head, a lever pivoted to a sliding block, and means for connecting
that cross-head and the valve-spindle with that lever, of the other cross-head, an
arm on a rocking shaft, means for connecting the arm with the latter cross-head,
and a link coupled to an arm on the rocking shaft and to the sliding block,
substantially as and for the purposes herein set forth.
5. In valve-gear for locomotive and other twin-cylinder engines, the combination,
with the cross-heads D and D', rocking shafts B and C, levers H J and H¹ J',
links G, M, G and M', sliding blocks mounted between guides on a quadrant-
shaft K, arms F and O, links E and N, arms P and P₁, and links Q and Q', of the
movable quadrant-shaft K, substantially as and for the purposes herein set
forth.
Dated the 31st day of January 1893.
A
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C., Chartered Patent Agent.