Improvements in Shaft or Automatic Expansion Governors for Steam Engines.
Year: 1895

page_text: Date of Application, 6th Feb., 1895
Compl te Specification Left, 29th Oct., 1895-Accepted, 21st Dec., 1895
PROVISIONAL SPECIFICATION.
Improvements in Shaft or Automatic Expansion Governors for
Steam Engines.
JAMES HUTCHINSON MANN Mechanical Engineer Canning Works, Dewsbury
Road, Leeds, SIDNEY CHARLESWORTH Mechanical Engineer Canning Works,
Dewsbury Road, Leeds, do hereby declare the nature of this invention to be as
follows:-
In our shaft or automatic expansion governor, instead of pivotting the eccentric
by an arm or tail piece, upon a stud in the governor wheel, we employ the following
arrangement, which consists of a governor or fly wheel keyed upon the crank shaft,
having lugs upon it, receiving pins, which form fulcrums for two distance levers or
arms, which pass through and carry at their other ends the eccentric, the attachi-
ment being made by similar lugs and pins to those on the wheel. The eccentric
has a slot hole through it, allowing it to be moved straight across the crank shaft,
thereby altering the travel of the valve (or reversing the engine if necessary),
without practically altering the "lead." The distance levers being of equal length
insure the eccentric being always parallel to the centre line of the engine, in any
position. We employ two weights (acting against springs) pivotted on studs in
the usual manner. A radius piece is bolted upon one of the weights which gives
the required movement to the eccentric through a die which is taken through the
body or that part of the eccentric, encircled by the strap (instead of through an
arm or lug cast on it) thereby enabling us to get a much longer bearing. The die
is further supported by 2 jaws on side of eccentric, made adjustable for taking
up wear.
Dated this 5th day of February 1895.
JAS. H. MANN.
SIDNEY CHARLESWORTH.
Improvements in Shaft or Automatic Expansion Governors for
Steam Engines.
We JAMES HUTCHINSON MANN and SIDNEY CHARLESWORTH of the
Canning Works, Dewsbury Road, Leeds in the County of York, Engineers, 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 :-
In our shaft or automatic expansion governor, instead of pivotting the eccentric
by an arm or tail piece upon a stud in the governor wheel; as is usual in shaft
governors, we employ the following arrangement. This consists of a governor
wheel or fly-wheel, which is keyed upon the crank shaft, and has lugs upon it for
receiving pius, which form fulcrums for two distance levers or arms.
distance levers or arms most conveniently pass through, and carry at their free
ends, the eccentric; the attachment being made by similar lugs and pins to those
These

page_text: on the wheel. Such levers form the sole attachment or means by which the
eccentric is carried. The eccentric has a slot hole through it, through which
passes the shaft, allowing the eccentric to be moved straight across the crank shaft
in a direction at right angles to the crank, thereby altering the travel of the valve
and consequently the expansion without practically altering the lead. The distance
levers being of equal length, ensure the eccentric being always parallel to the
centre line of the engine, i.e. at right angles to the crank shaft in any position.
We employ two weights, (acting against springs), pivotted on studs, and connected
by a link in the usual manner. A radius piece or curved block is bolted upon one
of the weights, which gives the required movement to the eccentric through a die
fitting over the radius piece, and which die is fitted to, by being inserted through
the eccentric sheave, or that part of the eccentric encircled by the strap, (instead
of through an arm or lug cast on it), thereby enabling us to get a much longer and
therefore steadier bearing. The die is further supported by two jaws on the side
of eccentric, made adjustable for taking up wear.
And in order that our invention and the manner in which the same is to be
performed may be more readily and clearly understood we have annexed hereto the
accompanying sheet of drawings in which :-
Fig. 1 is a side elevation of a shaft or automatic expansion governor constructed
in accordance with our invention, and Fig. 2 is a cross or end elevation of the
same; the rim of the governor wheel being shewn in cross section to permit of the
enclosed mechanism being clearly seen.
a indicates the crank shaft or other shaft on which the governor wheel b is
mounted and keyed, or otherwise secured. On this wheel are provided side
lugs (c Fig. 2, not shewn in Fig. 1), having pins d, which form fulcrums for two
broad distance pieces or arms e. These distance pieces or arms e pass through and
carry at their free ends the eccentric f, the attachment being made by the lugs g
on the front side of the eccentric and pins h. These levers e form the sole means
for carrying the eccentric from the governor wheel or other shaft attachment. The
eccentric is formed with a slot, through which the shaft a and the distance pieces e
pass, and which allows the eccentric f to be moved to and fro across the crank
shaft in a direction at right angles to the crank, whereby the travel of the valve
and consequently the ratio of the expansion are altered.
, over
Two weighted levers i and are provided, pivotted on pins or studs k and
attached to the governor wheel, the levers being connected together by means of
the link m. These weighted levers i and j are also connected to one end of the
springs n and o, the opposite ends of the springs being fastened to fixed lugs p on
the governor wheel. To the lever i is bolted a radius piece or curved block
which fits the dier, the stem of the die passing through the sheave of the eccentric
and through a boss cast on the sheave, in order to obtain a longer bearing surface,
without increasing the width of the governor as a whole. The dier also fits
between two jaws s which support the die, and are adjustable for taking up wear.
The dotted circles 1, 1, indicate the bolts attaching the radius piece to the
weighted lever i, and u¹ the centre about which the radius piece q is curved. If it
is desired to run in the reverse direction, the radius piece is taken off and fixed in
a fresh position, indicated by the bolt hole circles 2, 2, for which position the centre
of curvature of the radius piece is now at U.
It will be evident that the advantages of our invention consist in the simple and
almost frictionless method of carrying the eccentric sheave in such a manner that
the lead remains constant, and in obtaining a much longer bearing for the die
without increasing the width of the governor as a whole.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
olaim is :
1. A shaft or automatic expansion governor for steam engines characterized by
the use of a slotted eccentric sheave carried solely by a pair of broad parallel

page_text: levers of equal length, hinged to the fly-wheel or governor wheel or attached in an
equivalent manner to the crank shaft so that the traversing of the eccentric across
the crank shaft is effected in a straight line, that is without altering the lead.
2. In connection with the use of a curved block or radius piece and a die, the
method of connecting the die to the eccentric by carrying the die or stem thereof
through the body (ie. the sheave) of the eccentric (instead of to an arm or lug
cast on the eccentric) for the purpose of obtaining a longer and steadier bearing
without increasing the width of the governor as a whole.
3. In shaft or automatic expansion governors the use of a slotted eccentric
sheave carried solely by a pair of hinged parallel levers and having the die or stem
of the die connecting it to the traversing device fitted in and through the body
(i.e. the sheave) of the eccentric.
1°
4. In shaft or automatic expansion governors for steam engines, the combination
of a slotted eccentric carried by means of hinged parallel levers e pivotted to the
governor wheel b, a die block fixed in and through the body or sheave of the
eccentric, a weighted lever i (or levers i and j) pivotted to said governor wheel b
and controlled by a spring n (or springs n and o) and a curved block or radius
piece 7 attached to said lever i, all substantially as and for the purposes herein set
forth and as shewn.
5. Our improved shaft or automatic expansion governor substantially as herein
set forth and illustrated.
Dated this 28th day of October 1895.
J. CLARK JEFFERSON,
2 East Parade, Leeds, Agent for Applicants.