Year: 1898

page_text: I, HUGO LENTZ, of 44, Neustiftgasse, Brünn, in the Empire of Austria,
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 :-
The invention relates to a shaft governor for engines with slide valves or lift
valves.
In the accompanying drawings the shaft governor is shown as follows;-
Fig. 1. A cross section of the governor.
Fig. 2. Elevation in the direction of the arrow "1" of Fig. 1.
Fig. 3. Elevation in the direction of the arrow "2" of Fig. 1.
Fig. 4. A section of a second method of constructing the governor.
Fig. 5. Side elevation in the direction of the arrow "3" of Fig. 4.
On the boss a¹ of the casing a which is fast on the shaft r of the engine and which
may also be constructed so as to serve as a fly wheel, the fly ring 6 turns. This
ring b is prevented from moving sideways by means of a disc s, which is provided
with a projecting rim and fixed by means of the screw f. The fly-ring b is fastened by
the stud bolts d d¹ to the springs e e¹ which are in the form of watch springs and are
fixed to the casing a by the bolts by which means the fly ring b is maintained
in a stable position with respect to the shaft r and therefore with respect to the
casing a by means of the springs e e¹.
The weights p.pl are at one place attached to the fly-ring 6 by the bolts & d¹
which pass through the eyes t t and are supported at another place by the studs g g'
against which they are supported by the knife edges h h¹ and which are fixed in the
casing. In consequence of these connections the weights p p¹ are able to turn the
fly ring round at the same time compressing or stretching the springs e e¹.
A stud j is fixed in the boss of the casing a' on which the eccentric disc turns.
This eccentric disc is also connected with the fly ring 6 by the carrier stud k, so that
when the fly-ring turns round in the casing it turns the eccentric-disc round
with it.
When at rest the springs e e' hold the fly-ring b so far back that the weights p p¹ rest
upon the boss of the fly-ring, and then the eccentric takes the position of Fig. 2 which
allows the maximum supply of steam.
When the engine is started, the centrifugal force acts upon the weights p p' which
overcome the elasticity of the springs e e¹. The weights p p¹ can fly out ultimately
into the position marked 2 in Fig. 2, and during the period of this motion the
springs e el become stretched. During this motion the weights pp' assisted by the
inertia of the fly-ring b with which they are connected by the bolts d d' hold back the
fly-ring in relation to the motion of the casing a. Thereby the position of the bolt /

page_text: is at the same time altered; the latter, and with it the eccentric, takes the position
marked 2 in Fig. 2, which gives a minimum supply of steam.
When this occurs the events described before will take place in the reverse order.
The casing a moves more slowly, whilst the fly-ring b, on account of its momentum,
gets in advance of the casing. At the same time the slower motion of the casing
diminishes the centrifugal force of the weights, so that the stretched springs e e¹ pull
back the weights p p¹ by the bolts d d¹ and support the fly-ring in the direction of
its rotation.
Corresponding to the load on the engine at the moment, the centre of the eccentric
will take up some position between these two marked 1 and 2 which represent
respectively the maximum supply and minimum supply of steam.
Thus whenever any of the load is taken off the engine, as the velocity of the casing
increases while the fly-ring in consequence of its inertia maintains its velocity
unaltered, the fly-ring will fall behind the casing a. At the same time the
centrifugal force of the weights p p¹ will increase and these will fly further apart and
will thus hold back the fly-ring in its position and thus also the eccentric is brought
into such a position that a diminution in the supply of steam is effected.
When the load on the engine is increased, the velocity of the casing is diminished;
the fly-ring, however, in consequence of its momentum goes on in advance of the
casing a. Since at the same time the centrifugal force of the weights decreases,
these, by the action of the stretched springs e e¹ will close up and help on the fly-
ring in the direction of its motion. By these movements the eccentric o is moved
in the direction from 2 towards 1 and a greater supply of steam is given.
As a result of the action of these two forces,-that is-the inertia of the fly-ring b
on the one hand, and the centrifugal force of the weights p p¹ on the other, the
centre of the eccentric will be moved either from 1 towards 2 or in the reverse
direction until the steam supply is proportioned to the load.
The total reaction of the parts connected with the eccentric (for instance, weights
of slide valve and rods, steam pressure, inertia, and in some cases the pressure of
springs on lift-valves &c.) will be balanced by the momentum of the fly-ring b in the
same way as with the fly-wheel of an engine, so that a very small amount of
irregularity is attained.
The method of construction shown in Figs. 4 and 5 of the shaft governor consists
in making one of the weights p p in one piece with the eccentric o, or rigidly
connected with it by means of a bolt, and the studs k and j in the first construction
are dispensed with.
When the weights p p¹ fly apart, the eccentric o is carried along with the weight p,
and the whole arrangement acts as previously described.
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. A shaft-governor for slide-valve or lift-valve engines, distinguished by having
a fly-ring 6 turning loose on the boss a¹ of the casing a, connected on the one hand by
means of springs e e¹ formed like watch-springs with the casing a, on the other hand by
the stud with the eccentric o which turns on the stud j which is fixed eccentrically
to the engine shaft in the boss a of the casing a. Weights p p¹ suspended upon the
studs d d on the fly-ring b and supported on the studs g g¹ by the knife edges h h³,
so that when the engine is started, or afterwards if some of the load be taken off,
these weights fly apart and overcoming the elasticity of the springs e e¹ and assisted
by the inertia of the fly-ring retard the latter in relation to the velocity of the
casing a, whereby the eccentric o, in accordance with the supply of steam required
to suit the load, is turned round, whilst with an increase of load, on the engine, and
the retardation of the velocity of the casing a which is caused thereby, the fly-
ring b in consequence of its momentum, goes on in advance of the casing a, and is
assisted in this by the weights p p falling together under the influence of the
springs e e¹

page_text: 2. A method of constructing the shaft governor described which consists in making
one of the weights p p¹ and the eccentric o both in one piece, or by fastening
them rigidly together by a bolt.
3. A governor having the several parts constructed and arranged, substantially
5 as described
Dated this 19th day of May 1898.
WM. P. THOMPSON & Co.,
Manchester, Liverpool, and London, Patent Agents.