Improvements in Engine Governors.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in Engine Governors.
I, WILLIAM SISSON, of Quay Street Iron Works, Gloucester, in the County of
Gloucester, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention has reference to an improved construction of automatic expansion
governors particularly suitable for comparatively slow running engines of large size
with heavy working parts.
In using governors of the class referred to as heretofore constructed I have found
that even in engines of moderate size running somewhat slowly, the weight of the
eccentric sheave and attached gear introduces a considerable discrepancy into the
working of the governor, and moreover is liable to result in heavy knocking or
banging in the governor when the load is near either the maximum or the minimum,
the effect of the weight of the eccentric sheave, strap and rod being to open the
governor weights out during one portion of the revolution and close them in during
another, with the result that when the weights are near the stops they are liable to
be caused to touch them at one part of the revolution. Now in order to obviate
this disadvantage I make the two weights of the governor unequal to such an extent
as to balance or approximately balance the otherwise unsupported weight of the
eccentric sheave, strap, and portion of the eccentric rod in the case of a horizontal
engine, or in the case of a vertical engine (it may be) the eccentric sheave and strap
and the whole of the eccentric rod, valve spindle and slide valve, providing springs
of approximate strengths corresponding to the respective weights.
In some cases when the working parts are very heavy,
altogether and arrange the other so as to balance the eccentric sheave and other
may omit one weight
parts.
In order to avoid overhang and a twisting effect on the eccentric, it is formed
without any arms or projections outside its bounding circle in such wise that it can
be placed close up to the side of the disc or plate to which it is pivoted by a pin,
the link attachments or attachment, as the case may be, for connexion to the
governor weights, or weight, being arranged within the bounding circle of the
eccentric.
In a construction of governor according to this invention, the eccentric is mounted
upon a pin projecting from one side of a disc and is connected by links or a link
to pins or a pin that extend through slots in the disc to the other side thereof
where one of them is connected to an arm connected to the larger weight and the
other direct to the smaller weight.
The disc, carrying pins upon which the weights are mounted, may, for convenience,
be made in two halves each with a half boss from which extends an angular rib or
projection provided with a seat for the inner end of the corresponding spring, and
with a lug or projection that comes opposite the outer end of the angular rib or
projection on the opposite half of the disc, the two halves being connected by
bolts or studs and nuts that connect the two half bosses together and the outer end
of each angular rib or projection to the corresponding adjacent lug or projection.
Each weight has jointed to it one end of a rod the other end of which carries an
djustable plate that is arranged to work in a guide and between which and the
In

page_text: corresponding spring seat is a coiled spring encircling the rod, the spring for the
larger weight being larger and stiffer than that for the smaller weight.
Dated this 18th day of February 1896.
W. LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.
Improvements in Engine Governors.
I, WILLIAM SISSON, of Quay Street Iron Works, Gloucester, in the County of
Gloucester, Engineer, 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 :-
This invention has reference to an improved construction of automatic expansion
governors particularly suitable for comparatively slow running engines of large size
with heavy working parts.
In using governors of the class referred to as heretofore constructed I have found
that even in engines of moderate size running somewhat slowly, the weight of the
eccentric sheave and attached gear introduces a considerable discrepancy into the
working of the governor, and moreover is liable to result in heavy knocking or
banging in the governor when the load is near either the maximum or the minimum,
the effect of the weight of the eccentric sheave, strap and rod heing to open the
governor weights out during one portion of the revolution and close them in during
another, with the result that when the weights are near the stops they are liable to
be caused to touch them at one part of the revolution. Now in order to obviate
this disadvantage I make the two weights of the governor unequal to such an extent
as to balance or approximately balance the otherwise unsupported weight of the
eccentric sheave, and attached gear i.e. the strap, and portion of the eccentric rod
in the case of a horizontal engine, or in the case of a vertical engine (it may be)
the eccentric sheave and strap and the whole of the eccentric rod, valve spindle
and slide valve, providing springs of approximate strengths corresponding to the
respective weights.
In some cases when the working parts are very heavy, 1 may omit one weight
altogether and arrange the other so as to balance the eccentric sheave and other parts.
In order to avoid overhang and a twisting effect on the eccentric, it is formed
without any arms or projections outside its bounding circle in suchwise that it can
be placed close up to the side of the disc or plate to which it is pivoted by a pin,
the link attachments or attachment, as the case may be, for connexion to the governor
weights, or weight, being arranged within the bounding circle of the eccentric.
Referring to the accompanying drawings,
Fig. 1 is an inside view of a construction of shaft governor according to this
invention removed from the crank shaft of the engine,
Fig. 2 is a face view of the governor; and
Figs. 3 and 4 are sections on the line x x and y y Fig. 1, respectively.
The eccentric sheave 1 is mounted upon a pin 2 projecting from the outer side or
face of a disc 3 adapted to be keyed upon the crank shaft of the engine and is
connected by links 4 to pins 5, that extend through slots 6 in the disc to the other
side thereof where they are connected to the respective weights, 7, 7", one of them
being connected to an arm 8 carried by the larger and heavier weight 7 and the other
direct to the smaller and lighter weight 7. The unequal weights, 7, 7", (which are
mounted on pins 9 carried by the disc 3) are thus connected to the eccentric sheave in

page_text: such a manner that by suitably proportioning the two weights to one another they
can be caused to balance approximately the weight of the eccentric sheave and other
moving parts attached or connected thereto and to thus prevent any movement of the
sheave and consequent opening out or closing in of the weights, except that due to
their speed of revolution, and the action of the springs.
The disc 3, is formed with a boss from which extend angular ribs or projections 10.
Each weight has jointed to it one end of a rod 11 the other end of which carries
an adjustable plate 12 that is arranged to work in a guide 13 and between which
and a spring seat formed on the corresponding rib or projection 10 is a coiled
spring 14 encircling the rod 11, the spring for the larger weight being by preference
stronger and stiffer than that for the smaller weight so as to correspond to their
respective centrifugal forces. This, though preferable so as to avoid friction and
wear, is not essential, for if the springs be made equal in strength and stiffness and
each corresponding to the mean centrifugal force of the two weights, then the spring
attached to the heavier weight will be assisted by the surplus strength of the spring
(attached to the lighter one) by transmission through the links 4, pins 15 and eccentric
sheave 1, carrying these pins.
As will be seen on reference to Fig. 2, the pin 2 and the pins 15, which connect
the links 4 to the eccentric sheave are arranged within the bounding circumference
of the said sheave.
Figs. 5, 6, 7 and 8 are views corresponding respectively to Figs. 1, 2, 3 and 4 and
illustrating a modified construction of governor according to my invention, in which
the weights 7 and 7", instead of being cast integral with the bosses through which
the pins 9 pass, are adjustably mounted on arms 16 projecting from such bosses,
bolts 17 extending through slots 16" in the arms and nuts 17 being provided for
fixing the weights in any required position.
In some cases, the disc 3 may for convenience be made in two halves each with
a half boss from which extends one angular rib or projection 10, provided with a
seat for the inner end of the corresponding spring, and with a lug or projection that
comes opposite the outer end of the angular rib or projection on the opposite half
of the disc, the two halves being connected by bolts or studs and nuts that connect
the two half bosses together and the outer end of each angular rib or projection to
the corresponding adjacent lug or projection.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. An automatic expansion governor in which the governor weights are relatively
proportioned and arranged to balance or approximately balance the otherwise
unsupported weight of the eccentric sheave and attached gear substantially in the
manner hereinabove described.
2. An automatic expansion governor having one weight adapted to balance or
approximately balance the otherwise unsupported weight of the eccentric sheave and
attached gear substantially as described.
3. My improved automatic expansion governors substantially as described with
reference to the examples illustrated respectively in Figs. 1 to 4 inclusive, and in
Figs. 5 to 8 inclusive of the accompanying drawings.
Dated this 18th day of November 1896.