Improvements in or appertaining to Apparatus for Actuating the Cut-off or Throttle Valve Gear of Corliss and other Engines.
Year: 1896

page_text: Date of Application, 14th Apr., 1896
Complete Specification Left, 22nd Jan., 1897-Accepted, 27th Mar., 1897
VISIONAL
CATION.
Improvements in or appertaining to Apparatus for Actuating
the Cut-off or Throttle Valve Gear of Corliss and other
Engines.
We, JOHN SCARISBRICK WALKER, THOMAS ASCROFT WALKER and
EDWIN ROBERT WALKER, Engineers, of Pagefield Iron Works, Wigan in the
County of Lancaster do hereby declare the nature of this invention to be as
follows:-
This invention is designed to enable the governor in a Corliss engine to work
the present hand cut-off gear, the latter being slightly modified to effect this
arrangement. The cut-off gear in use at the present time consists of a worm driven
by a band wheel. This worm works into a pinion or circular rack on a cross shaft
and on this cross shaft are keyed the levers coupled with the trip levers of the
Corliss gear. Now in order to enable the governor to also work this gear and thus
when the engine is going too quickly the governor shall at once act on the cut-off
gear through the trip levers we cause the worm to slide on a feather on the shaft
and give a considerable length of shaft between the two bearings at opposite ends
of the worm so that the worm shall have a considerable longitudinal freedom of
movement. A spring normally however keeps the worm in the ordinary position
against one bearing. On the shaft of the pinion gearing into the worm we place a
second lever and connect this with the governor rod. An adjusting screw regulates.
the tension of the spring and thus the delicacy of action of the governor can be
regulated. The mode of action is as follows:-If the engine has to be regulated
by hand, the hai d-wheel is turned, the worm at once turns the pinions the spring
being powerful enough to keep the worm in its normal position or at any rate it
acts as an abutment and the hand-wheel can be turned until the necessary degree
of cut-off is obtained. The cut-off therefore is adjusted by hand for ordinary
purposes. The governor acts in the following manner.-The engine going too quickly
there is at once a pull on the governor rod consequently on the lever connecting it
with the shaft of the pinion aforesaid. The pinion consequently turns and simply
moves the worm forward against the pressure of the spring. The moment however
the governor goes slower the pull on the rod is relaxed and the spring exerting itself
presses the worm and consequently the pinion back towards their original position.
If there be a spring between each end of the worm and its respective bearing, the
governor can also be regulated in the same way for any great accession of work
being placed on the engine necessitating a great lessening of the cut-off. This
however is not so useful as the former arrangement. We have described the
invention only for the Corliss engine, but it is obvious that this arrangement of
hand and governor device is applicable for the governing of any kind of engine as
instead of being connected with the trip levers of a Corliss engine it can be
connected with the cut-off, throttle valve or even ordinary valve mechanism of
other engines.
WM. P. THOMPSON & Co.,
Of 6 Lord Street, Liverpool, Patent Agents for Applicants.

page_text: COMPLETE SPECIFICATION.
Improvements in or appertaining to Apparatus for Actuating
the Cut-off or Throttle Valve Gear of Corliss and other
Engines.
We, JOHN SCARISBRICK WALKER, THOMAS ASCROFT WALKER aud
EDWIN ROBERT WALKER, Engineers, of Pagefield Iron Works, Wigan in the
County of Lancaster, 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 is designed to enable the governor in a Corliss engine to work
the present hand cut-off gear, the latter being slightly modified to effect this
arrangement.
The invention will be understood from the following description, reference being
had to the accompanying drawings, in which
Figure 1 is an elevation of our hand cut- ff and governor gear, as applied to a
Corliss engine;
Figure 2, a view at right angles to Figure 1 of the levers M and N and
shaft L.
Referring to these figures-A is the usual oscillating disc, placed centrally, or
otherwise, on the cylinder B, with pins C to which the rods D are coupled
imparting motion to the spindles E of the oscillating steam inlet valves by means
of the cranks F. G are the trip levers and H' the trip hooks or catches. The
hand cut-off gear in use at the present time consists of a worm I, actuated by the
hand-wheel J. This worm I works into a worn-wheel or pinion K which is keyed
on the cross shaft L, and on this cross shaft is keyed the double lever N, the ends
of which are connected to the trip levers G G of the Corliss gear. It will be seen
that the turning of the hand-wheel J revolves the worm I and turns the shaft L
one way or the other.
Now in order to enable the governor to also work this gear, and thus when the
engine is going too quickly the governor shall at once act on the cut-off gear
through the trip levers, we cause the worm ! to slide on a feather on the end of
shaft P, and give a considerable length of shaft between the two bearings Q and Q
at opposite ends of the worm I, so that the worm I shall have considerable
longitudinal freedom of movement. A spring R normally however keeps the
worm I in the ordinary position against one bearing Q. On the shaft L, we place
a second lever M, and connect this with the governor rod O. An adjusting
screw T regulates the tension of the spring R, and thus the delicacy of action of
the governor can be varied.
The mode of action is as follows:-
If the engine is to be regulated by hand, the hand-wheel J is turned. The
worm I at once rotates and turns the worm wheel K, the spring R being powerful
enough to keep the worm in its normal position, or at any rate it acts as an
abutment, and the hand-wheel J can be turned until the necessary degree of cut-off
is obtained. The cut-off therefore is adjusted by hand for the ordinary purposes.
The governor acts in the following manner :-The engine going too quickly, there
is at once a pull on the governor rod O, consequently on the lever M connecting it
with the shaft L of the worm wheel K aforesaid. The worm wheel or pinion K
consequently turns, and simply slides the worm I forward on the shalt P against
the pressure of the spring R. The moment, however, the governor goes slower,
the pull on the rod O is relaxed, and the spring R exerting itself, presses the worm
and consequently the pinion back towards heir original position. If there be a

page_text: spring between each end of the worın 1 and its respective bearing Q, the governor
can also be regulated in the same way for any accession of work being placed on
the engine necessitating a great lessening of the cut-off. This, however, is not so.
useful as the former arrangement.
We have described the invention only for the Corliss engine, but it is obvious
that this arrangement of hand and governing device is applicable for the governor
of any kind of engine, as instead of being connected with the trip levers of the
Corliss engine, it can be connected with the cut-off, throttle valve, or even the
ordinary valve mechanism of other engines.
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. The improvement in or appertaining to apparatus for actuating the cut-off or
throttle valve gear of Corliss and other engines, whereby the valves can be
regulated either by hand or governor independently of each other substantially as
described.
2. In apparatus for actuating the cut-off or throttle valve gear of Corliss and
other engines, in which a worm, mounted on a shaft and driven by a hand-wheel or
its equivalent, works into a pinion, on a shaft carrying levers that are coupled to
the trip levers of a Corliss engine, or with the cut-off throttle or other valve
mechanism of other engines, the arrangement for regulating the cut-off or throttle
valve gear by either hand or governor, namely, arranging the worm aforesaid so
that it shall be capable of being rotated by its hand-wheel or of sliding
longitudinally on a feather on its shaft so that it shall have a considerable
longitudinal freedom of movement when the governor comes into play, in com-
bination with a spring for keeping the worm normally in the ordinary position in
gear with the pinion and against an abutment or bearing, and an extra lever on
the said pinion shaft connected with the governor, whereby if the hand-wheel or
its equivalent be turned the cut-off or throttle valve gear will be worked by the
worm rotating and working into the pinion, or when the governor comes into play
the worm will be slid longitudinally on its shaft by the rotation of the pinion.
and enable the governor to regulate the said gear automatically substantially as
described.
3. In apparatus for enabling a governor to work the cut-off or throttle valve
gear of Corliss or other engines, the use of a worm so arranged as to be capable of
working into and rotating a pinion when the worm is rotated by its shaft, or of
being slid longitudinally by the pinion when the latter is rotated, substantially as.
and for the purpose set forth.
4. The general combined arrangement and construction of parts forming our
improved apparatus for enabling the governor of an engine to work the hand
cut-off gear of a Corliss engine or the cut-off throttle valve or other valve mechanism.
of other engines, substantially as described.
W. P. THOMPSON & Co.,
Of Liverpool, Manchester, Birmingham, and London, Patent Agents.