Improvements in Shaft Governors for Motive Power Engines.
Year: 1896

page_text: Date of Application, 6th May, 1896-Accepted, 25th July, 1896
COMPLETE SPECIFICATION.
Improvements in Shaft Governors for Motive Power Engines.
I, FERDINAND BOSSHARDT, of the Firm of F. Bosshardt & Co., of
4, Corporation Street, Manchester, in the County of Lancaster, Patent Agent,
do hereby declare the nature of this invention which has been communicated
to me by Johann Rudolf Frikart, of 24, Karlstrasse, München, in the
German Empire, Engineer, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
=
This invention relates to improvements in shaft governors for motive power
engines and has for its object to provide means whereby the speed of the governor
can be regulated within certain limits whilst running.
A
And in order that my invention may be more fully understood I have caused
to be appended hereunto four sheets of drawings marked with letters of referénce
indicating like parts in the various figures.
Fig. 1, Sheet I, is a cross section at line A-A of Fig. 2, Sheet II, and the
latter a longitudinal section of Fig. 1 at line B-B,
Fig. 3, Sheet III, is a cross section at line C-C of Fig. 2,
Fig. 4 a cross section at line D-D of Fig. 1, of my improved shaft governor
without safety appliance.
Fig. 5, Sheet IV, is a side view, Fig. 6 an end view and Figs. 7 & 8 respectively
a sectional end and side view enlarged of the various parts constituting the safety
appliance.
In carrying out my invention and referring to Fig. 1, Sheet, I, I employ a
suitable number of frames a (in the present instance 4) each formed with pivots b
and suitably suspended. The inner end of each frame a is placed 'under the
influence of springs E, which have a tendency of pressing the frame towards the
centre of the main shaft F, and carries also an adjustable weight C'the centrifugal
force of which balances the springs E.
As the weights C are brought nearer to or further away from the centre of the
pivots b, the speed necessary to form a balance will be increased or reduced
respectively.
In order to vary the position of the weights C whilst the governor is running,
the frames a are formed as shown in Fig. 5, Sheet IV. The weights C are each
guided between the longitudinal rails of the frame a and rendered adjustable by
means of a screwed spindle G actuated by means of bevel wheels H, H: The
pivot J of each frame a is furnished with a lever K whereby motion is transmitted
to the eccentric L Fig. 2, whilst in the other hollow pivot M, is mounted a shaft
which transmits motion from the bevel wheel H' to the bevel wheel N. Each
wheel N gears into a pinion O fixed upon a short shaft. P carrying a bevel
wheel which latter gear into two bevel wheel R, R' adapted to rotate independently
of each other around the centre of the main shaft. F and the back of which are
turned out conically and adapted to receive the friction cones S & S¹ respectively.
The wheels R & R¹ are kept in their proper positions by means of a ring T,
which also form sockets for the shafts P. The cones S, S₁ connected together by

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a bush are made. adjustable longitudinally upon a stationary bush U by means of
screws V, so as to bring one or the other into frictional contact. The latter
carry each a bevel pinion W which gear into a wheel X rotated by means of a
handle Y.
The mechanism described operates as follows;―
The main shaft F, with the whole of the governor, the shafts P, wheels Q, R
& R', rotates whilst the friction cones S, S¹ remain stationary out of contact with
the cones on the wheels R, R¹.
If it is desired to vary the speed, by turning the wheel Z, by means of the
handle Y in one or the other direction, the wheels H & W and the screws V are
actuated and the friction cone S or S¹ is caused to respectively engage the
wheel R or R' and bring the same to a standstill. The shafts P rotating
continuously with the whole of the governor, they will rotate around their centres
whilst the wheel R or R¹ remain stationary as long as the cones are in contact
with each other. This movement of the shaft P by means of the wheels O, N,
H, H, is imparted to the screws G and causes a displacement of the weight C.
The inner position of the weights C corresponds with the highest and the outer
with the lowest number of revolutions and in order to render the range as large as
possible the frames a are so balanced by weights employed opposite to the
weights C that its point of gravity with all the cross. connections, the
spindle G, the wheel H and the lever K, will be in the centre of rotation of its
pivot b, b.
As soon as the desired speed has been obtained the cone S or S¹ is brought out
of contact with the wheel R or R' as the case may be, by turning back, by means
of the handle Y, the wheel Z to its middle position, whereby the whole of the
mechanism is thrown out of action.
However in case such should be omitted a safety appliance is provided by means
of which the action of the screws G will be automatically discontinued as soon as
the weights have arrived at their outer or inner ends.
This safety appliance shown in Figs. 6, 7 & 8, Sheet IV, is constructed as
follows;
Upon the screwed spindle G is employed a nut f, adapted to turn in the
weight C and having at each end a ratchet wheel h. As will be seen from
Figs. 6 & 7 the ratchet wheels h are adapted to oppose each other, and the nut f
is thus prevented from turning as long as the pawls are kept in gear by the
springs f¹.
If the weight C approaches the end of its travel, the pawls i on that side will
be put out of action owing to the projections k arranged thereon being pressed
outwards by means of inclined slots l'after which the nut fcan freely turn in the
weight C and the movement of the latter is discontinued until the screwed
spindle G turns in the same direction.
If the latter turns in the opposite direction the weight C will be caused to
reverse its travel again as the nut f is prevented from turning by the pawls i at
the other end of the weight C.
Having now particularly described and ascertained the nature of my said inven.
tion, and in what manner the same is to be performed, I declare that what I
claim, is-
1st. A shaft governor, consisting of balanced frames a which are arranged under
the influence of springs E, and carry weights C, which latter, by means of the
screwed spindles G, wheels H & H', N & O, shafts P, wheels Q & R, R,
friction cones S & S¹, screws V, and wheels W & Z, can be displaced for the
purpose of varying the speed whilst the engine is running, all substantially as set
forth.
2nd. A safety appliance, consisting of a nut f employed in the weight C and
provided at each end with a ratchet wheel h and pawls i, which are arranged to

page_text: oppose each other and serve to break the connection between the weights C and
nut f, as soon as the weight arrives at the end of its travel, all substantially as set
forth.
Dated this 5th day of May 1896.
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester, Agents to Applicant.