Year: 1884

page_text: I, ROBERT MATTHEWS of Hyde in the County of Chester, Engineer, seek leave
to amend the Title and Specification of Letters Patent No 10,368 of 1884, as
shewn in red ink in the copy of the original Specification hereunto annexed.
My reasons for making this amendment are as follows:-
Since I filed, on the 10th July 1884, my said Specification N° 10,368, there was
published, on the 21st October 1884, the Specification of Letters Patent N° 6702
granted to William Hargreaves and William Inglis and dated the 23rd April 1884.
In this Specification No 6702 I find described a considerable part of the invention
which I had believed to be my own, and now, seeing- that in this I had been .
unwittingly anticipated, I desire to confine my claims to those parts of my
invention which are not set forth in the said Specification No 6702 of 1884.
In the matter of the application made by Robert Matthews for leave to amend
the Specification of Letters Patent N° 10,368 of 1884.
In the matter of the application made by Robert Matthews for leave to amend
the Specification of Letters Patent N° 10,368 of 1884.
I hereby grant leave to the said Robert Matthews to amend the said Specification

page_text: I ROBERT MATTHEWS of Hyde in the County of Chester, Engineer, do hereby
declare the nature of my Invention for "AN IMPROVEMENT IN SAFETY GEAR
FOR STARTING LARGE FLY-WHEELS OR DRIVING WHEELS" 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 an improvement in safety gear for starting large
fly-wheels or driving wheels, so arranged that when the wheel started by it begins
to outrun the starting apparatus, the latter is at once thrown out of gear and is
kept out of gear. I will describe this apparatus referring to the accompanying
Drawings.
.Fig. 1 is an elevation of starting apparatus with one part of my improvement
applied thereto becording to my Invention-in-its-simplest form. A is a portion of
the toothed rim of the large wheel or drum that has to be started. With this rim
gears a pinion B which also gears with a worm C on a shaft driven by a small
engine or other motor. The shaft of the pinion B works in bearings D. which are
free to slide backwards and have jointed to them a.tumbling weight E. While the
pinion B is driving the wheel A, being itself driven by the worm.C, it is kept by
the strain of the worm in gear with A; but, when A tends to move faster than B,
then B tending to drive the worm C is by the reaction of the worm caused to move
away from A, and as soon as the weight E passes its vertical position, it by falling
over to the dotted position E¹ rapidly withdraws B out of gear with A and holds
it in that position. When A has stopped and has to be started again B is put in
gear with it by raising the hand lever F.
1
The worm C might obviously be arranged above the pinion B; and in cases
where the wheel A may have to be started in either direction, two worms may be
used, the one above, the other below B, either being raised out of gear with B
when the other is to be used.
The worm C and pinion B with its sliding bearings D constituting starting
apparatus for a large wheel A, having been described in the Specification of a
prior Patent, are not claimed as of my invention.
°
When the shaft of the worm C is worked by a small engine, as is usually the
case I add to the gear shewn in Fig. 1, the parts shewn by Fig. 2, that is to say,
I link the lever F by a connecting rod G to a catch H which holds the lever K in
such a position that the throttle or stop valve of the engine is kept open; but
when the pinion moves out of gear with A, the rod G is pulled down and after
descending a certain distance determined by a slot g at its upper end, it pulls
down the catch H and so permits the valve to be closed by the descent of the
loaded lever K, thus stopping the small engine.
→
Instead of or in addition to the tumbling weight E, I sometimes use the arrange-
ment shewn in Fig. 3, passing the rod G through a cylinder L fitted with a double
piston P P and having two steam supplies M and N and an exhaust O. The
cylinder has ports and passages so arranged in relation to the pistons P P₁ that the
steam pressure acts in the following manner. When B is in gear with A, steam
can enter the cylinder by N under the lower piston P¹ while steam is free to escape
from above the upper piston P to O; the pistons and their rod G are thus pressed
upwards holding.B in gear with A; but when B moves away from A, the piston P¹
descends till it covers the supply N and opens the passage from under P¹ to O,

page_text: and P also descending.closes the passage from above P to O and opens the supply M,
whereupon the steam presses down the pistons and so causes B to be rapidly
withdrawn out of gear with A.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim as an improvement in safety gear for starting large fly-wheels or driving
wheels is:
1. The combination of a tumbling weight E and hand lever F with the sliding
bearings of the starting apparatus substantially as described and shewn in Fig. 1
of the accompanying Drawings.
2. In combination with the apparatus shewn in Fig. 1, the rod G and the trip
gear for steam valve as shewn in Fig. 2.
3. In combination with the apparatus shewn in Fig. 1 the steam cylinder with
its pistons and passages arranged and operating as described with reference to
Fig. 3.

page_text: I ROBERT MATTHEWS of Hyde in the County of Chester, Engineer, do hereby
declare the nature of my Invention for SAFETY GEAR FOR STARTING LARGE
FLY-WHEELS OR DRIVING WHEELS " 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 safety gear for starting large fly-wheels or driving
wheels, so arranged that when the wheel started by it begins to outrun the starting
apparatus, the latter is at once thrown out of gear and is kept out of gear. I will
describe this apparatus referring to the accompanying Drawings.
Fig. 1 is an elevation of apparatus according to my Invention in its simplest
form. A is a portion of the toothed rim of the large wheel or drum that has to be
started. With this rim gears a pinion B which also gears with a worm C on a
shaft driven by a small engine or other motor. The shaft of the pinion B works in
bearings D which are free to slide backwards and have jointed to them a tumbling
weight E. While the pinion B is driving the wheel A, being itself driven by the
worm C, it is kept by the strain of the worm in gear with A; but, when A tends
to move faster than B, then B tending to drive the worm C is by the reaction of
the worm caused to move away from A, and as soon as the weight E passes its
vertical position, it by falling over to the dotted position E rapidly withdraws B
out of gear with A and holds it in that position. When A has stopped and has to
be started again B is put in gear with it by raising the hand lever F.
The worm C might obviously be arranged above the pinion B; and in cases
where the wheel A may have to be started in either direction, two worms may be
used, the one above, the other below B, either being raised out of gear with B
when the other is to be used.
When the shaft of the worm C is worked by a small engine, as is usually the
case I add to the gear shewn in Fig. 1, the parts shewn by Fig. 2, that is to say,
I link the lever F by a connecting rod G to a catch H which holds the lever K in
such a position that the throttle or stop valve of the engine is kept open; but
when the pinion moves out of gear with A, the rod G is pulled down and after
descending a certain distance determined by a slot g at its upper end, it pulls
down the catch H and so permits the valve to be closed by the descent of the
loaded lever K, thus stopping the small engine.

page_text: Instead of or in addition to the tumbling weight E, I sometimes use the arrange-
inent shewn in Fig. 3, passing the rod G through a cylinder L fitted with a double
piston P P and having two steam supplies M and N and an exhaust O. The
cylinder has ports and passages so arranged in relation to the pistons P P' that the
steam pressure acts in the following manner. When B is in gear with A, steam'
can enter the cylinder by N under the lower piston P' while steam is free to escape
from above the upper piston P to O; the pistons and their rod G are thus pressed
upwards holding B in gear with A; but when B moves away from A, the piston P¹
descends till it covers the supply N and opens the passage from under P¹ to O,
and P also descending closes the passage from above P to O and opens the supply M,
whereupon the steam presses down the pistons and so causes B to be rapidly
withdrawn out of gear with A.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim as safety gear for starting large fly-wheels or driving wheels is :-
1. Apparatus substantially as described and shewn in Fig. 1 of the accompanying
Drawings.
2. In combination with the apparatus shewn in Fig. 1, the rod G and the trip
gear for steam valve as shewn in Fig. 2.
3. In combination with the apparatus shewn in Fig. 1 the steam cylinder with
its pistons and passages arranged and operating as described with reference to
Fig. 3.