IMPROVEMENTS RELATING PROVISIONAL SPECIFICATION
Year: 1869

page_text: LETTERS PATENT to George Salt, of Saltaire, in the County of.
York, Manufacturer, and William Inglis, of Bolton, in the County of
Lancaster, Engineer, for the Invention of "IMPROVEMENTS RELATING
PROVISIONAL SPECIFICATION left by the said George Salt and William
Inglis at the Office of the Commissioners of Patents, with their
Petition, on the 24th May 1869.
We, GEORGE SALT, of Saltaire, in the County of York, Manufacturer,
and WILLIAM INGLIS, of Bolton, in the County of Lancaster, Engineer,
do hereby declare the nature of the said Invention for "IMPROVEMENTS
RELATING TO STEAM ENGINE GOVERNORS AND ADMISSION OR THROTTLE VALVES,"
to be as follows, that is to say :-
This Invention has for its object the introduction in connection with
steam engine governors of appliances which will bring about the
stoppage of the engine in the event of the governor ceasing to rotate
from any cause, such as, for example, the failure of the mechanism
actuating it. In ordinary arrangements the stoppage of the governor's
rotation causes the supply of steam to the engine to be instantly

page_text: increased to its fullest, and when such stoppage occurs from failure
of the driving connections between the engine and governor it may
lead to very serious damage from the excess of steam thus made to act
on the engine.
The present Invention consists in applying a weight or spring, which
on being set free to act will close the throttle valve or act in an equi-
valent manner on "cut-off" gear, and in arranging a catch or catches
in connection with the governor in such a position that on the governor
balls descending to a predetermined point the governor will act on the
catch or catches and release the weight or spring; such catch
catches may be adjusted by hand after the engine is started, or may be
connected with the starting or stop valve lever or hand wheel so as to
be adjusted by opening the valve, and require no further attention. In
one convenient modification of the details a rod by which the ordinary
nction of the governor is transmitted to the throttle valve or to variable
cut-off" gear is inade like the connecting rod in what is known as
"liberating valve gear," that is, with catches which are released by a
toe lever or trigger connected to a fixed but adjustable point when
the connecting rod moves into a position corresponding to that of the
fixed point. The weight or spring is applied to the rod and acts instantly
on the catches being released.
Appliances such as are comprised in the present Invention are
especially needed when the governor is driven by means of a belt,
as the belt is liable to give way sooner or later, although its use is in
many cases more convenient than that of other gearing. When a belt is
used appliances of the kind herein-before described may be used; or a
lever in connection with the throttle valve or "cut-off" gear may have
a weight or spring applied to make it bear with an interposed antifriction
pulley against the belt, so that on the belt breaking the weight or
spring is free to act and stop the supply of steam.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Salt and William Inglis in the Great
Seal Patent Office on the 23rd November 1869.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, GEORGE
SALT, of Saltaire, in the County of York, Manufacturer, and WILLIAM 3
INGLIS, of Bolton, in the County of Lancaster, Engineer, send greeting.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-fourth day of May, in the.
year of our Lord One thousand eight hundred and sixty-nine, in the
thirty-second year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto us, the said George Salt and William
Inglis, Her special licence that we, the said George Salt and William
Inglis, our executors, administrators, and assigns, or such others as we,
the said George Salt and William Inglis, our executors, adminis-
trators, and assigns, should at any time agree with, and no others,
from time to time and at all times thereafter during the term therein
expressed, should and lawfully might make, use, exercise, and vend,
within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for "IMPROVEMENTS RELATING TO
STEAM ENGINE GOVERNORS AND ADMISSION OR THROTTLE. VALVES," upon the
condition (amongst others) that we, the said George Salt and William
Inglis, our executors or administrators, by an instrument in writing
under our, or their, or oue of their hands and seals, should particularly
describe and ascertain the nature of the said Invention, and in what
manner the same was to be performed, and cause the same to be
filed in the Great Seal Patent Office within six calendar months next
and immediately after the date of the said Letters Patent.
NOW KNOW YE, that we, the said George Salt and William Inglis,
do hereby declare the nature of our said Invention, and in what manner
the same is to be performed, to be particularly described and ascer
tained in and by the following statement in writing, reference being
had to the accompanying Drawings, that is to say:-
Our said Invention has for its object the introduction in connection
with steam engine governors of appliances which will bring about the
stoppage of the engine in the event of the governor ceasing to rotate
from any cause, such as, for example, the failure of the mechanism
actuating it.
And in order that our said Invention and the manner of performing
the same may be properly understood, we have hereunto appended
a Sheet of explanatory Drawings to be herein-after referred to, and
representing by way of example two modifications of our improved
arrangements.
Figure 1 is a side elevation showing some of the principal parts of a
steam engine having a horizontal cylinder 1, and the admission valves of

page_text: "
which are supposed to be of the kind worked by "liberating valve gear!
controlled by a governor 2. The details of the valve gear are not shown,
with the exception of the small lever 3 to which the governor is con-
nected, and the position of which determines the periods when the
admission valves close. In ordinary arrangements the stoppage of the
governor's rotation causes the supply of steam to the engine to be
instantly increased to its fullest extent, and when such stoppage occurs
from failure of the driving connections between the engine shaft and
the governor 2 it may lead to very serious damage from the excess of
steam thus made to act on the engine. By our Invention such damage
is avoided, by the engine being brought to a standstill under the cir-
cumstances referred to; and for this purpose we apply a weight or
spring, which on being set free to act will close the throttle valve or act
in an equivalent manner on "cut-off" gear, and in some modifications
we arrange a catch or catches in connection with the governor in such a
position that on the governor balls descending to a predetermined point
the governor will act on the catch or catches and release the weight or
spring. In the example shown in Figure 1 a weight 5 is applied by
means of a bell-crank lever G directly to the rod 7, by which the action
of the governor 2 is transmitted to the lever 3 of the cut-off gear. The
rod 7 is connected by a coupling piece 8 to the bell-crank lever 9 of the
governor, this coupling piece being fitted with a pair of clips, whilst the
end of the rod 7 is fitted with a disengaging toc lever or trigger 10 like
the valve rods of a well-known kind of "liberating valve gear." The
trigger 10 is connected by a link 11 to a lever 12, which is adjustable by
hand, the parts being shown in the positions in which they are when
ready to act; then should the rotation of the governor cease from any
cause the consequent descent of the balls will first cause the rod 7 to be
moved over towards the cylinder 1, which will be in the direction cor-
responding to an increased supply of steam, but this action will be only
momentary, as on the rod 7 being moved a certain distance the trigger 10
will effect the disengagement of the two parts 7, 8, of the rod, and the
weighted lever 5, 6, will immediately move the part 7 away from the
cylinder, and thereby adjust the valve gear so as to admit no steam.
When about to start the engine the hand lever 12 is placed in its other
position, being adjusted after starting in that in which it is shown, or it
may be connected with the starting or stop valve lever or hand wheel,
so as to require no further attention.
Appliances such as are comprised in our present Invention are

page_text: especially needed when the governor is driven by means of a belt (13),
as the belt is liable to give way sooner or later, although its use is in
many cases more convenient than that of other gearing. When a belt
is used appliances similar to the modification herein-before described may
be used, or a modification of the kind shown in Figure 2 may be
adopted. In this example the weight 5 of the bell-crank lever 6 is in
the form of a pulley, and is arranged to rest upon the driving belt 13,
whilst the lever 6 is connected by a rod 14 to the lever 3 of the valve
motion, the latter being prolonged and fitted with a pin for it. The end
of the rod 14 is formed with a loop, which allows the lever 3 to move in
obedience to the ordinary action of the governor, whilst the rod 7 from
the governor has on it a spring 15 of sufficient range to allow of the
lever 3 being moved in opposition to the governor when in consequence
of the failure of the belt 13 the weighted lever 5, 6, falls over. The
action of the lever 6 in this way causes the supply of steam to be
stopped.
In both the delineated examples our appliances are shown as adapted
to variable cut-off valve gear, but they may obviously be arranged
without difficulty to act on an ordinary throttle valve.
Having thus particularly described our said Invention, and the manner
in which the same is to be performed, we have to state that we do not
restrict ourselves to the precise details herein described or delineated, but
that what we believe to be novel and original, and claim as the Invention
secured to us by the herein-before in part recited Letters Patent is, the
arranging of appliances, substantially such as are herein described, in
connection with steam engine governors and admission or throttle valves,
for the purpose of stopping the supply of steam when the rotation of the
governor ceases from any cause.
In witness whereof, we, the said George Salt and William Inglis,
have hereunto set our hands and seals, this Twenty-second day
of November, in the year of our Lord One thousand eight hundred
and sixty-nine.
GEORGE SALT.
(L.S.)
WILLIAM INGLIS. (L.s.)