IMPROVED SAFETY GEAR FOR STARTING OR TURNING ENGINES PROVISIONAL SPECIFICATION
Year: 1883

page_text: LETTERS PATENT to John Musgrave and Robert Gregory, Junior both of
Bolton in the County of Lancaster for an Invention of "IMPROVED SAFETY
GEAR FOR STARTING OR TURNING ENGINES
PROVISIONAL SPECIFICATION left by the said John Musgrave & Robert
Gregory, junior, at the Office of the Commissioners of Patents on the
3rd January 1883.
JOHN MUSGRAVE and ROBERT GREGORY, Junior, both of Bolton in the County
of Lancaster "IMPROVED SAFETY GEAR FOR STARTING OR TURNING ENGINES".
Our improved starting gear consists of a small pinion gearing into the cogs of
the driving wheel of the large engine or into a wheel on the main or second motion
shaft.
The pinion is a loose or sliding fit on the starting gear shaft near its end and it
is formed with one or more claws or saw teeth on one side and the boss on the
other side has a groove into which the ends of a hand lever, pivoted to the frame,
rest for the purpose of sliding the pinion on the starting gear shaft.
Keyed to this shaft is the other half of the saw tooth or clutch coupling.
In order to start the large engine the hand lever is moved so as to slide the
pinion into gear with the cogs on the fly wheel and the saw teeth come into gear
with the clutch keyed to the starting gear shaft so that motion being given to the
latter shaft it is communicated by the clutch and pinion to the fly wheel of the
largo engine.
Should the pinion be left in gear when the large engine starts, the saw tooth.
clutch aided by a weight on the long arm of the hand lever will immediately cause
it to slide out of gear without any breakage or accident.
Our invention can be applied to marine and other engines in which a roversing
motion is required.
33
"
ог turning
30->
For this purpose we employ two pinions on separate shafts either of which can
be moved by means of a hand lever into gear with the "barring
wheel of the main engine; on each of these shafts is keyed a worm wheel, both of
[Price Gil.]

page_text: which gear into a sliding worm which rests against a fixed collar near one end of
the starting gear shaft and to which it is connected by a float key fixed in the
shaft.
The motion from this starting shaft is transmitted through the worm to the two
worm wheels keyed to the shafts which carry the pinions and to which shafts the
clutches are secured; one of the pinions (to give the desired direction to the main
engine) is moved on the shaft by a hand lever into gear with the "barring" or
turning" wheel and the fixed portion of the clutch and thus transmits inotion
from the starting shaft to the main engine.
In order to reverse the engine the pinion last in use is moved out of gear on the
shaft by the hand lever and the other pinion (with reverse motion) brought into
action by another hand lever.
In case the large engine was started with both the starting pinions in gear with
the "barring" or "turning" wheel one of thein would be thrown out of gear and
the worm would slide out of gear at the same time.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Musgrave & Robert Gregory, junior, in the Great Seal
Patent Office on the 2nd July 1883.
JOHN MUSGRAVE and ROBERT GREGORY, Junior, both of Bolton in the County
" S
of Lancaster. "IMPROVED SAFETY GEAR FOR STARTING OR TURNING ENGINES
Our improved starting gear consists of a small pinion gearing into the cogs of
the driving of the large engine or into a wheel on the main or second motion
shaft.
The pinion is a loose or sliding fit on the starting gear shaft near the end and it
is formed with one or more claws or saw teeth on one side and the boss on the
other side has a groove into which the ends of a hand lever pivoted to the frame
rest for the purpose of sliding the pinion on the starting gear shaft. Keyed to
this shaft is the other half of the saw tooth or clutch coupling.
In order to start the large engine, the hand lever is moved so as to slide the
pinion into gear with the cogs on the fly wheel and the saw teeth come into gear
with the clutch keyed to the starting gear shaft: so that motion being given to
the latter shaft it is communicated by the clutch and pinion to the fly wheel of the
large ongine.
Should the pinion be left in gear when the large engine starts, the saw tooth
clutch aided by a weight on the long arm of the hand-lever will immediately cause
it to slide out of gear without any breakage or accident.
Our invention can be applied to marine and other engines in which a reversing
motion is required.-For this purpose we employ two pinions on separate shafts
either of which cau be moved, by means of a hand lever, into gear with the
“barring” or “turning" wheel of the main engine: on each of these shafts is

page_text: keyed a worm wheel, both of which gear into a sliding worm which rests against a
fixed collar near one end of the starting gear shaft and to which it is connected by
a float key fixed in the shaft.
The motion from this starting shaft is transmitted through the worm to the two
worm wheels keyed to the shafts which carry the pinions and to which shafts the
clutches are secured one of the pinions (to give the desired direction to the main
engine) is moved on the shaft by a hand lever into gear with the "barring" or
turning" wheel and the fixed portion of the clutch and thus transmits motion
from the starting shaft to the main engine.
In order to reverse the engine, the pinion last in use is moved out of gear on the
shaft by the hand lever and the other pinion (with reverse motion) brought into
action by another hand lever.
In case the large engine was started with both the starting pinions in gear with
the "barring" or "turning" wheel one of them would be thrown out of gear and
the worm would slide out of gear at the same time.
And in order that our invention may be fully understood and readily carried
into effect we will proceed to describe the accompanying two sheets of drawings
reference being had to the figures and letters marked thereon.
Fig. 1 is a front elevation. Fig 2 a side elevation and Fig. 3 is a plan of our
improved safety gear for starting or turning engines; in these views the auxiliary or
starting engine is shown-Fig 4 is a front elevation, Fig 5, a side elevation and
Fig 6 is a plan of our improved starting gear applied to a fly wheel with internal
spur teeth. Fig. 7 is a front elevation. Fig 8 a side elevation and Fig. 9 a plan
of our improved starting gear applied to a marine or other engine which is required
to be " run or started in either direction at will.
"
In Figs 1. 2. and 3. a is the fly wheel of the engine to be started; a¹ are the
spur teeth on its periphery, b is the pinion which is free to slide on the crank
shaft b' of the auxiliary engine c. On the shaft b¹ is keyed or secured one half of
a saw tooth or clutch coupling c¹, the pinion b has saw teeth formed on one side of
the boss to correspond with those on c¹; on the opposito boss of 6 is turned
a groove 6 into which the ends of the vertical lever d project; the weighted hand
lever e is employed to move the pinion b into or out of gear with the teeth on the
fly wheel a. The operation of starting or moving the dy wheel a of the large or
main engine into any required position is as follows; the hand lever e is moved so
as to slide the pinion b into gear with the teeth of the fly wheel a; the saw teeth
on b and c¹, forining the clutch, also come into gear at the same time; steam is now
admitted to the auxiliary engine c and sets it and the large engine in motion; the
pinion b remains in gear with a only so long as b. is the driver, as soon as the large
engine attains sufficient velocity to drive b (in place of being driven) the part of
the saw tooth clutch c¹ pushes 6 from it and the weighted lever e assists in sliding
the pinion 6 out of gear with the wheel a. The fly wheel a of the main engine
may be moved, and stopped repeatedly without the necessity of sliding the
pinion b, out of gear with the wheel a-as in all cases the pinion will slide out of
gear with the fly wheel before the main engine attains its normal speed. Instead
of putting the pinion on the crank shaft, it may be fitted on a second shaft geared
from the auxiliary engine.
In Figs 4. 5. and 6 a represents the fly wheel of the main engine with internal
spur teeth a' and b the pinion which is free to slide on a shult c, driven by a
starting or auxiliary engine not shewn in the drawings: one half of a saw tooth
clutch c¹ is keyed or secured to the shaft c and the pinion b has saw teeth on one
side which form the other half of the clutch; this pinion is moved into gear with
the fly wheel a and half clutch c¹ by means of the weighted hand lever e; the
operation is similar to that described with reference to Figs. 1. 2. and 3.
In Figs 7. 8. and 9. we shew our improved starting gear applied to a marine or
reversing engine-In these views a is the "barring" or "turning" wheel, with
teeth on its periphery, not shown in the drawing; b is a shaft driven by a starting
or auxiliary engine with a worm b¹ which gears into and drives the worm wheel c,

page_text: secured to the shaft c¹ which revolves in bearings c³ c², a hand lever is employed
to move the worm d, which is free to slide on a feather key along the shaft c¹ and
transmits motion to the worm wheels e and f, which are secured respectively to the
shafts c' and f¹; on these shafts are made or fixed the half saw tooth clutchos e² ƒª
-the pinions g. and h are free to slide on the shafts e¹ and fl respectively, they are
provided with saw teeth on one side, and grooves g' and ' in the opposite bosses.
into which the ends of the hand levers and respectively project. When motion
is given to the shaft b, the worm b' drives the worm wheel c, shaft c¹ and worm d
which is moved into gear with the worm wheels cand f by the hand lever d'; and
thus motion is transmitted to the shafts e¹ and ƒ which revolve in opposite
directions. When it is desired to move the "barring" or "turning" wheel a in
one direction, the pinion g is moved into gear with the clutch e² and when it is
desired to turn the wheel a in the reverse direction the pinion h is moved into gear
with the clutch f.
In case the barring wheel a has been started by the pinion 7 when both
pinions g and h were in gear with it, the first movement of the wheel a would
throw the pinion h out of gear with the clutch f, and the pinion g which had been
used for starting would be thrown out of gear with the barring wheel before the
engine attained its normal speed.
Having stated the nature of our invention and described the manner of
performing the same.
We declare that we claim
1. The improved safety gear for starting or turning engines substantially as
herein shewn and described
2. The use of a sliding pinion, driven by an auxiliary engine, in combination
with a clutch in the manner and for the purposes herein described and as shewn
with reference to Figs 1. 2. 3. 4 5. and 6.
3. The combination of the worm wheel d, actuated by an auxiliary engine, and
worm wheels e and f with the sliding pinions g and h and clutches e² and f* for
the purpose of starting a marine or other engine in either direction substantially as
described and as shown with reference to Figs 7. 8. and 9.
In witness whereof I the said John Musgrave for myself and on behalf of the
said Robert Gregory, junior have hereunto set my hand and seal this
twenty eighth day of June, One thousand, ciglt hundred, and eighty three.
JOHN HOOD AVE