Improvements in Stop Gear for Steam Engines.
Year: 1893

page_text: Date of Application, 3rd Oct., 1893
Complete Specification Left, 7th Nov., 1893—Accepted, 20th Jan., 1894
PROVISIONAL SPECIFICATION.
Improvements in Stop Gear for Steam Engines.
I, JOHN HOWARD TENNYSON of 54, Charlton Street, in the City County and
State of New York, United States of America, Engineer, do hereby declare the
nature of this invention to be as follows:-
My invention relates to stop gear for arresting the motion of engines of the
Corliss or other like type and it has for its object to provide a simple durable and
economic device capable of attachment to any such engine whereby from any point
in the building, no matter how far distant from the engine, the engine may be
stopped as quickly if not quicker than when the stoppage is performed in the usual
manner.
For the purpose of this invention the bevel wheels by which the governor spindle
is driven are capable of being thrown out of gear by a longitudinal sliding motion
imparted to the driving wheel by a weight and spring actuated fork whose arms are
slotted to receive die blocks on trunnions engaging with a collar on the wheel boss,
the collar and shaft being enclosed in a stationary hood or casing having slots
through which the trunnions pass. The gear shifting fork is normally prevented
from so acting by its tail end engaging with a spring bolt so as to keep the
governor driving wheels in gear, the bolt being capable of being withdrawn to
release the fork by cords attached to it and leading to various parts of the building.
When the fork is thus released the shutting off of the steam is effected by an arm
on a weight and spring actuated rock shaft so acting on the governor crank which
operates the cut-off gear usual in Corliss and other similar engines as to prevent
the valve opening mechanism from coming into action to open the valves. This
rock shaft is however normally prevented from coming into action by a locking
arm upon it engaging with an arm on the gear shifting fork from which it is
released only on the oscillation of the fork taking place. When however it does
come into action the governor crank and cut-off gear are so shifted that bosses on
the arms to which the cut-off rods are connected are brought into such position as
to act on the crabs of the valve opening mechanism and so move them that the picks
of the crabs cannot engage with the valve fingers to open the valves.
Dated this 3rd day of October 1893
J. H. TENNYSON,
By A. M. & Wni. Clark,
53, Chancery Lane, London, Chartered Patent Agents.
COMPLETE SPECIFICATION.
•
Improvements in Stop Gear for Steam Engines.
I, JOHN HOWARD TENNYSON of 54, Charlton Street, in the City County and
State of New York, United States of America, 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 relates to stop gear for arresting the motion of engines of the
Corliss or other like type and it has for its object to provide a simple, durable, and
economic device capable of attachment to any such engine whereby from any point
in the building, no matter how far distant from the engine, the engine may be
[Price Sdl

page_text: stopped as quickly, if not quicker, than when the stoppage is performed in the usual
manner.
The invention consists in the novel construction and combination of the several
parts, as will be hereinafter fully set forth and pointed out in the claims.
Reference is to be had to the accompanying drawings, forming part of this
Specification, in which
Figure 1 is a side elevation of an engine of the Corliss type, having the stop gear
applied.
Figure 2 is a side elevation of the major portion of the device and a vertical
section through the governor gear casing.
Figure 3 is a front elevation of the device and is likewise a partial sectional view,
the section being taken practically on line 3-3 Figure 2.
Figure 4 is a longitudinal section through the governor driving gear, illustrating
the governor driving gear and the engine stop gear in the position. the latter gear
assumes when it comes into operation, the governor casing and the stop mechanism
being shewn in rear elevation.
Figure 5 is a horizontal section through the governor casing, taken practically on
line 5-5 Figure 4 and illustrating the stop mechanism in plan.
Figure 6 is an edge view of the crab of the cut-off valve of the engine.
Figure 7 is a section taken practically on line 7-7 Figure 6.
Figure 8 is a detail view, illustrating the manner in which the stop mechanism is
held in its inactive or normal position while the governor driving gear is in operative
position.
Similar figures and letters of reference indicate corresponding parts in all the
views.
The gear by which the governor spindle 10 is driven is capable of being thrown
out of engagement and consists preferably of a bevel wheel 11 on said spindle with
which gears another wheel 14 on a hub 12 capable of sliding upon a guide rod 13
or its equivalent and upon which a pulley 15 is keyed or otherwise secured. The
outer end of the hub which is preferably contained within a casing 16 carries a
collar 17 which does not revolve with the hub 12 and is connected at opposite sides
with trunnions 18 having pivotal or rocking engagement with the collar 17, said
trunnions passing through slots in the casing 16 and through blocks 19 fitted to
slide in slideways in the arms 20 of a fork B so that when the fork B is rocked
there can be no possible jam in its connection with the hub 12. The fork B is
pivoted on an axis 25 carried by arms 26 or otherwise supported and it has a
shank 21 which is adapted to engage with a bolt B¹ or its equivalent, attached to
any convenient fixed support. When the stem of the fork is in engagement with
the bolt the governor driving wheels 11 and 14 are in gear, this being the normal
position. A spring 22, attached to the tail piece 21 of the fork and to a bracket 23
or other fixed point, tends to rock the fork and throw wheel 14 out of gear with
wheel 11, and a weighted arm 24 projecting from the fork has the same tendency,
so that as soon as the bolt B' is disengaged from the fork-shank 21 the spring and
weight will act combinedly to throw the wheel 14 out of gear with the wheel 11.
In a standard 28, preferably at the rear of the governor casing 27, a rock shaft 29
is journaled. The rock shaft has rigidly secured to it a curved arm 30 and from
this arm is suspended a weight 32 capable of quickly drawing the arm 30 downward
and thereby rocking the shaft 29. This action of the weight is supplemented by
that of a spring or springs 42 whereby to render the motion of the arm as rapid as
possible. The curved arm 30, which may be termed a trip-arm, has a friction
roller 30 at one side in position to bear upon the governor crank 33 to which is
connected, as usual, the shifting rod 34 usually connected with the governor sleeve
for the purpose of drawing down the governor balls, as shewn in Figure 1. The
governor crank likewise carries the usual rocking bar 35 whose opposite ends are
connected by jointed rods 36 with the arms D of the inlet valves which are provided
with the usual fingers 37 to be engaged by the crabs 38 used in engines of the
Corliss type. The arm D is provided with stops 39, shewn in Figure 7, and when

page_text: the rocking bar 35 is shifted from its normal position by the trip-mechanism which
has been partially described above one of these stops 39 will act on the crab 38, as
shewn in Figure 7, so as to prevent the pick 41 of the crab from engaging with the
valve-finger to open the valve. The end of the governor crank which carries the
rocking bar 35 is journaled in suitable bearings 36ª carried by any convenient
support. To the outer end of the rock shaft is attached an arm 43, which may be
termed a lock-arm. This arın 43 is shaped to suit the engine and normally extends
downward and is provided at its lower end with a friction roller which bears, as
shewn in Figure 8, against an arm 44 fixed to the fork B so that while the fork is
in its normal position the rock shaft 29 will be so held as to prevent the trip-arm 30
from acting on the governor crank. Cords or other connections 45 are attached to
the bolt B, as shewn in Figure 1, and lead to various parts of the building so that
by pulling any one of them the bolt may be disengaged from the shifting fork.
When the bolt B' is thus withdrawn, the fork is oscillated, as shewn in Figure 4,
and the wheel 14 disengaged from wheel 11 of the governor driving gear, thus
stopping the governor at the same time that the bar 44 is withdrawn from the
arm 43 of the trip-mechanism so that the weights and springs 32 and 42 are free to
draw down the trip arm 30 causing it to so act on the governor crank as to cause
the governor balls to close and the rocking bar of the cut-off rods to be so shifted
as to cause the valves with which they are connected to cut-off, presenting the
proper lugs to the crabs to prevent their picks from touching the cut-off fingers.
By this means the engine may be stopped almost instantly from any portion of the
building and even with greater facility than by the mechanism ordinarily provided
upon the engine for that purpose.
I do not, however, restrict myself to the use of tensional connections for tripping
the bolt as electrical devices may be employed for that purpose, and I further
desire it to be understood that the details of the invention may be varied,
equivalents being substituted and that some of the parts may be omitted without
departing from the nature of the invention.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In an engine of the type specified, a stop gear connected with the cut-off valve
and controlled by the governor, substantially as and for the purpose specified.
2. A shifting governor gear and a trip mechanism controlled thereby and adapted
to act upon the governor crank, substantially as described.
3. In an engine, a governor gear provided with a shifting section, a device for
shifting the same, substantially as described, and a trip-mechanism controlled by
the governor and having a shifting action upon the cut-off rods whereby the
governor gear is disconnected and the trip mechanism automatically closes the
cut-off valves, substantially as described.
4. In an engine, a shifting governor gear, a trip mechanism controlled thereby
adapted to act upon the governor crank, a shifting mechanism connected with the
governor gear, a locking device connected with the shifting mechanism, and means,
substantially as shewn and described, for releasing the lock from said shifting
mechanism at the engine, or at any point remote therefrom, as and for the
purpose specified.
5. In an engine, a shifting mechanism adapted to operate upon the governor
crank of the engine, the two being normally held out of engagement, and a releasing
device having connection with the trip mechanism capable of being operated at the
engine, or at a point remote therefrom, whereby when the releasing device is
operated the trip mechanism acting upon the governor crank will close the cut-off
valve of the engine, substantially as shewn and described.
6. In an engine, the combination, with a shifting governor gear, a rocking arm
adapted for engagement with the governor crank, a support normally maintaining
the arm out of engagement with the crank, and a shifting mechanism connected

page_text: with the governor gear capable of being operated from a point near the engine or
remote therefrom, and a releasing device connecting the shifting mechanism and
the support of the rocking arm whereby the shifting mechanism and arm will
operate simultaneously, as set forth.
7. In an engine, the combination, with a shifting governor gear, of a rocking arm
adapted to act upon the governor crank, tension devices connected with the rocking
arm and tending to draw it to an engagement with the governor crank, a supporting
device connected with the rocking arm, a shifting, mechanism connected with the
governor gear, and a releasing device carried by the shifting mechanism and
engaging with the supporting device of the rocking arm, as and for the purpose
specified.
8. In an engine, the combination, with a shifting governor gear, a rock shaft, a
trip arm projected from the rock shaft and adapted to engage with the crank of
the governor, and tension devices tending to draw the arm to a contact with the
governor crank, of a shifting mechanism connected with the governor gear, tension
devices connected with the shifting mechanism and operating to carry the sections
of the gear out of engagement, a supporting arm connected with the rock shaft, a
releasing device adapted for engagement with the supporting arm and connected
with the shifting mechanism, a locking device adapted for engagement with the
shifting mechanism, and means for tripping said locking device, as and for the
purpose specified.
2
1
1000
400L
J. H. TENNYSON,
By A. & Wm. Clark,
53, Chancery Lane, London, Chartered Patent Agents.