An Improved Form of Apparatus for Turning or Barring the Fly- wheels of Steam Engines and other Heavy Machinery.
Year: 1889

page_text: Date of Application, 28th Aug., 1889
Complete Specification Left, 22nd May, 1890-Accepted, 28th June, 1890
PROVISIONAI. SPECIFICATION.
An Improved Form of Apparatus for Turning or Barring the Fly-
wheels of Steam Engines and other Heavy Machinery.
We THOMAS GREENWOOD and JOHN WILLIAM WHITELEY, both of Sowerby Bridge,
in the County of York, Foreman Mechanics do hereby declare the nature of this
invention to be as follows:-
The object of our invention is to arrange and construct an improved form of
apparatus for starting large fly wheels when they have stopped with their cranks
over a dead centre, or when large fly wheels require to be assisted when starting.
To accomplish this object, we mount a pinion wheel loosely on a short horizontal
shaft, such pinion being in gear with the teeth of the fly wheel.
On one side of the pinion wheel we form one half of a clutch taking into a corre-
sponding half of a clutch fixed upon the said horizontal shaft, so that when the said
shaft is inade to rotate by a small engine or other means, the fixed clutch causes the
pinion wheel to rotate, consequently moving the fly wheel, but as soon as the fly
wheel runs quicker than the pinion wheel, the former causes the latter to be dis-
engaged from the fixed clutch and slided out of the way of the fly wheel.
To prevent the pinion wheel getting back again to the fixed clutch, a Hat steel
spring, let into a key-bed in the horizontal shaft, becomes liberated and occupies a
position which prevents the pinion wheel approaching the clutch, but when it is
necessary to slide the pinion wheel back so as to place the clutches into gear the
workman pushes the flat spring away from its position, whereupon the pinion wheel
can be slided into the fixed clutch ready for action. In order that the sliding clutch
may get fairly "home" into the fixed clutch, the jaws of the clutches are inclined
or cain shaped; such inclines also preventing the clutches from separating too easily.
Dated thie 97th day of Angust 1889
TASKER & CROSSLEY,
Halifax, Agents.
COMPLETE SPECIFICATION.
An Improved Form of Apparatus for Turning or Barring the Fly-
wheels of Steam Engines and other Heavy Machinery
We, THOMAS GREENWOOD and JOHN WILLIAM WHITELEY, both of Sowerby Bridge,
in the County of York, Foremen Mechanics, 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 :-
The object of our invention is to arrange and construct an improved form of
apparatus for starting large fly wheels when they have stopped with their cranks over
a dead centre, or when large fly wheels require to be assisted when starting.
To accomplish this object, we mount a pinion wheel loosely on a short horizontal
shaft, such pinion being in gear with the teeth of the fly wheel. On one side of
the pinion wheel we form one half of a clutch taking into a corresponding half of
a clutch fixed upon the said horizontal shaft, so that when the said shaft is made
to rotate by a sinal engine or other means, the fixed clutch causes the pinion
wheel to rotate, consequently moving the fly wheel, but as soon as the fly wheel
runs quicker than the pinion wheel, the former causes the latter to be disengaged
from the fixed clutch and slided out of the way of the fly wheel.
Such being the nature and object of our said invention, we will now proceed to
describe the same more fully, and for that purpose inake reference to the accom-
panying sheets of drawings illustrative thereof, wherein Fig. 1 is elevation and Fig. 2
.

page_text: plan view of a small auxiliary engine employed to give, by means of worm and wheel,
a slow rotary motion to the shaft A, on which is fixed a clutch B, and also on the said
shaft A we place loosely a pinion wheel C the internal part of which pinion is provided
with a clutch D, as shewn more clearly in detail Fig. 3. This clutch formed within
the pinion wheel is, when required, placed into gear with the fixed clutch B so that
when the auxiliary engine is started, the clutch B drives the pinion C, and as this
loose pinion is in gear with the teeth of a fly wheel of a large or main engine, it
follows that the large fly wheel would be set going and made to rotate, but as soon as
the fly wheel gains in speed over that of the pinion, which it immediately does,such
said pinion, which is loose on its shaft, is made to revolve quicker than the clutch,
consequently the pinion is slided end wise out of gear with the driven clutch B, but
this takes place only when the pinion has performed its function. When our improved
starting or barring apparatus is next required to be used, the workınan simply slides
the clutches into gear, when it is at once ready for restarting.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is :-
Firstly. For starting or barring fly wheels of steam engines and other heavy
imachinery, the use of a loose pinion-wheel, provided with a clutch, made to revolve
by a driven clutch, but liberated in the manner described and for purposes set
forth.
_ Secondly. The general combination and arrangement of parts forming our improved
entrotua