Year: 1886

page_text: We JOHN GERHARDT, Mechanical Engineer, and SAMUEL: DAVIS, Merchant both of
the City of Montreal, in the Dominion of Canada, 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:—
Our invention consists, principally, of a governor for steam engines wherein the
governor valve is operated by pivoted vanes and suitable mechanism connected
therewith, the vanes being arranged to be acted upon by centrifugal force and the
resistance of the air for opening the vanes against the tension of a main spring
arranged to normally hold the vanes closed or drawn inward toward the axis of the
governor.
The invention also consists of the connections of the vanes or the shafts thereof to
the mainspring or its enclosing barrel, whereby the length of leverage gradually
decreases as the opening angle between the radii of the governor and the vanes
increases, and vice versa.
The invention also consists of means for regulating the tension of the mainspring,
of the means employed for lifting the valve rod, and of the construction arrangement,
and combination of parts, all as hereinafter described and claimed.
Reference is to be had to the accompanying drawings, forming a part of this
specification, in which similar letters of reference indicate corresponding parts in all
the figures.
Figure 1 is a central vertical sectional elevation of our new and improved governor.
Fig. 2 is a detailed view showing the means for regulating the tension of the main-
spring. Fig. 3 is a sectional plan view on line of Fig. 1, and Fig. 4 is a similar
view on line y. y. of Fig. 1.
A represents the main hollow standard of the governor formed with the base A¹
and oilcup A and formed or provided with the horizontal arm A³, which constitutes
the bearing for the motor-shaft B. Within the hollow standard A is placed the
tube C, which is arranged to be revolved by the shaft B, through the medium of the
two beveled gear-wheels B and C, secured respectively, upon the shaft B and
tube C, so as to mesh with each other, the tube being stepped upon the standard A
by the collar or annular boss C, formed or secured upon the tube, as shown clearly in

page_text: •
Fig. 1.
Secured to the tube C, above the collar or boss C², are the two circular
plates D D, and within the tube C is placed loosely the valve rod E, which is
constantly pressed downward by the spiral spring F, which acts between the upper
end of the rod E, and the plug G, screwed into the upper end of the said tube C. To
the lower end of the rod is attached, by a set-screw or otherwise, the small rod E³,
which passes down through the stuffing box H in the base plate A' to the steam valve.
(Not shown.) The valve rod E in the tube is saddled upon the cross bar I, the said
rod and tube being respectively and correspondingly mortised, as shown at a b, for the
passage through them of the said cross bar I; and the rod E is provided at its upper
end with the screw c, which impinges upon the upper edge of the crossbar I, so that
by turning this screw the rod E may be raised or lowered for adjusting it relatively
to the governor valve, with which it may be connected by rod "E₁, and which it is
designed to operate.
Between the two circular plates D D', on either side of the tube C, are secured the
two vertical posts J J, and in line with the said posts are journaled, in the plates D D',
the two vertical shafts K K, each of which is provided with a vane, L, and these vanes
project in opposite directions from their respective shafts, as shown clearly in Figs. 3
and 4.
The shafts K are each provided with a horizontal cai, M, and the said shafts are
yoked together by a rod, N, connected to the cams as shown in Fig. 4, so that the
said shafts and the vanes L, will move exactly in unison. The cams M are (in the
operation of the governor) for raising and lowering, the cross bar I, and with it
the valve rod E E, as the vanes L veer to and from the axis or centre of the
plates D D. The cams M act upon the ends of the bar L, and to avoid friction
-the small rollers are journaled upon the ends of the bar I, under and against which
the cams act, and beneath the cams are placed the rollers,, also attached to the
posts J, so the cams act between the rollers and with very little friction. For
guiding the bar 1 in its up and down movement, the vertical posts J are slotted at j
for the passage through said posts of the bar I, as clearly shown in Figs. 1 and 4.
=
The vanes are normally held closed-that is held at the position shown in full lines
in Fig. 4by the mainspring P, which acts through the medium of the barrel Q,
which incloses the spring, and the connections or chains RR, connected with the
said barrel, and the heads & secured to the upper ends of the vane-shafts K.
The barrel Q is placed loosely upon the collar S, which is slipped upon the upper
end of the tube and rests upon the upper surface of the upper circular plate D
The outer end of the spring is attached to the barrel Q, while its inner end is attached
to the said collar, so that any tension upon the spring (the collar S being
relatively stationary) will tend to turn the barrel upon the collar. The collar S, is
locked in its relatively stationary position by the worm wheel d, secured thereon, and
the small worm-shaft d', which meshes with the worm-wheel, and is journaled in two
lugs, e, formed upon the frame T, which rises from the upper surface of the plate D',
as shown in Fig. 2. The worm-shaft d, is made square at one end for the application
of a key for turning the collar Q for winding the mainspring P, to increase or
diminish the tension thereof, so its reaction upon the vanes L may be adjusted to
increase or diminish the speed of the engine.
The heads, at the upper ends of the vane-shafts K, and to which the chains Rare
connected, are by preference eccentrics. These net as levers, and are arranged so that
their greatest leverage is applied to the vanes Lat the time the vanes are closed, as
shown in Fig. 3, and are least affected by the resistance of the atmosphere in revolving.
The object of this is to increase the sensitiveness of the governor when running at its
normal speed. As the speed increases and the vanes open out-ward under the influence
of the centrifugal force and the resistance of the air, the leverage of the mainspring T
upon the yanes gradually diminishes in length, so that at high speed the vanes are
very sensitive and vary with every slight variation of the speed of the governor.
m mare stop-rods fitted in the plates D D' to prevent the vanes from being
drawn inward foo far by the action of the mainspring P, and upon the lower ends of

page_text: the shafts K are secured the stop-fingers m³, that are adapted to strike the stop
screws m² to limit the outward movement of the yanes L.
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.
1. In a steam governor, the combination with the valve-rod of rotating and pivoted
vanes controlled by a spring acting independently of the valve-rod and connected to
the valve-rod by means whereby the opening and closing of the vanes will move the
valve-rod longitudinally, substantially as described.
2. The valve-rod E, resting upon the cross-piece I, in combination with the
shafts K, vanes L, and cams "M, for lifting the cross-piece I and valve-rod, sub-
stantially as described.
3. The shafts K, to which the vanes are secured, in combination with the main-
spring P, the eccentrics k, and the connecting chains R, substantially as and for the
purposes described.
4. The barrel Q, containing the mainspring P, in combination with the vanes and
vane-shafts and connections R, the barrel being provided with means for turning
the same, for increasing or diminishing the tension of the spring, substantially as
described.
5. The standard A, containing the revolving sleeve C, and the revolving valve-
rod E, and provided with the plates 1) D', in combination with the vanes I and
their shafts K, the cams M, cross bar I, that rests upon the cams and supports the
valve-rods E, the mainspring P', barrel Q, and the chains R, connecting the barrel
with the shafts K, substantially as described.
HORN & SON,
Agents on behalf of the Applicants.