Improvements in or relating to Engine Governors Combined with Eccentrics or Cranks.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in or relating to Engine Governors Combined with
Eccentrics or Cranks.
SAMUEL HARRISON, Kirkgate, Ripon, Yorks Surveyor, do hereby declare the
nature of this invention to be as follows:-
In order to alter the lead of eccentrics or cranks the shaft A has fixed to it
the frame B which carries the levers C, weights & springs; the inside of B
forms the pitch line on an internal wheel against which the wheels E revolve;
the wheels E drive forward the wheel G which is affixed to eccentric H by a
sleeve G, H & sleeve are fixed together; are loose on shaft and take up any
position desired; the carriers 1) revolve freely and have pins, some of which
are engaged by the levers C & on others the wheels E revolve.
The wheels and levers may drive or be driven by friction, teeth, bands,
chains, &c.
The action is as follows.
The weights when revolving at a sufficient speed to overcome the springs
fly out causing the levers C to push the carriers D forward which cause the
wheels E to revolve against the inside of B and acting as a lever to force the
wheel G onward which being fast to the eccentric H by a sleeve causes the
eccentric H to alter its lead.
When the force is not sufficient to overcome the strength of the springs they
pull the levers down and a reverse action takes place.
Dated this Eighth day of February 1899.
SAMUEL HARRISON.
Improvements in or relating to Engine Governors Combined with
Eccentrics or Cranks.
SAMUEL HARRISON, Kirkgate, Ripon, Yorks Surveyor, do hereby declare the
nature of my invention for Improvements in Engine Governors and in what
manner the same is to be performed, to be particularly described ad ascertained
in and by the following statement:-
In steam or other engines fitted with governors for varying automatically
the lead of the eccentric controlling the point of cut off, difficulty is experienced
in providing a sufficient range of action under varying loads without a great
variation in the speed of the engine. In the invention herein described means
are provided whereby the lead of the eccentric or crank & so on controlling

page_text: the cut off, is given a relatively large motion as compared to that of the
governor weights & hence for a small change in the speed of the engine a wide
variation in the point of cut off can be attained.
One method of carrying out my invention is as follows-Referring to the
drawings accompanying my Provisional Specification the shaft A has firmly
secured to it a frame or carrier B fitted with the necessary supports for two or
more movable levers C, C, carrying governor weights. The inside of the
frame B is also provided with teeth thus forming an internal gear wheel. The
shaft A also carries carries, but loose thereon, the eccentric & sleeve H to which
is keyed the spur wheel G; a loose frame or carrier D is fitted on the sleeve H
so as to embrace the wheel G & provides centres for intermediate wheels E, E,
which gear with wheel G & also with the internal teeth on inside of frame B.
This frame D also carries pins which engage with the slotted extensions of the
levers C, C. To vary somewhat the rate of revolution & also to provide a
return force for the mechanism. adjustable springs are respectively attached to
frame B & levers C, C. The action is as follows;-When revolving, the
weights are thrown out by centrifugal force & the frame D is drawn around
by the slotted ends of the levers C, C, engaging the pins in the frame D.
This causes the wheels E, E, to rotate in the internal gear as a rack & form
an epicycle train which causes the partial rotation of the spur wheel G & hence
of the attached sleeve or eccentric H. As the weights move inwards or outwards
with the variations of speed, their limited range of motion is multiplied by
the gearing described & this augmented partial rotation of the eccentric back-
wards or forwards is used to vary the point of cut off over a wide range.
The gear wheels shown are not essential to this method of governing, friction
gear may be used, or pulleys, bands, or chains or equivalent levers & so on.
The mechanism described shows the application to a shaft governor, but
the same principle of a small motion of the governor weights with multiplying
gear may also be applied to the direct action of a valve.
Having now particularly described and ascertained the nature of my said
invention, & in what manner the same is to be performed I declare that what
I claim is;-
-
I. The combination of a frame fixed to a shaft and carrying levers, weights &
springs with multiplying gear so arranged as to vary the lead of an eccentric
or crank & the like and thus control the point of cut off.
Dated this 2nd day of November 1899
SAMUEL HARRISON.