IMPROVEMENTS IN THE EXPANSION GEAR OF STEAM ENGINES
Year: 1884

page_text: I HERMANN KÜHNE, of 34 Great St Helens in the City of London in the
County of Middlesex, Merchant do hereby declare the nature of my Invention for
IMPROVEMENTS IN THE EXPANSION GEAR OF STEAM ENGINES to be as follows:-
:―
Referring to the accompanying drawings a lever E receives by attachment to an
excenter or crank a circular movement in its point b, and by ättachment to a bridle
rod L, which swings round the firm point c a rocking movement in its point t. In
consequence the point e of the said lever E moves compulsorily in a pear shaped
curve To the point e is attached a second bridle rod O the other end f of which
is suitably connected to the governing rod M of the governor. The movement of
the point fin the desired curve, circular or otherwise, round the point e may also
be obtained by cutting a slot into the said lever E, and by a sliding block guided
in the said slot by the governing rod.
To the point of the said second bridle rod O, or to the said sliding block, a
suitable arm G, moving round the centre of either, is attached which glides with
its other end in a sleeve H, the said sleeve being attached to one arm of a bellcrank
or two armed lever B or B', the other arm of which bellcrank or lever acts on the
steam admission valve or cock or other suitable steam admission arrangement, which
hereafter is called the admission valve.
The closing of the said admission valve may be effected by a weight or spring or
other suitable means.
The point m at which the arm G in its movement through the sleeve H acts on
the bellcrank or two armed lever is determined by suitable lock nuts or otherwise.
The movement of the point b being made suitably synchronous with that of the
engine shaft and the position of the governor influencing that of the point f of the
said arm G, the cut off of the steam is effected in an automatically variable but
compulsory manner.
The described system is usually applied twice to each steam engine cylinder, that
is in pairs, right and left hand or otherwise, each of the two systems in a direction
opposite or parrallel to the other. The two bellcranks or armed levers either act
each on a separate admission valve, as shown in B, once during every revolution of
the engine, or both bellcranks or two armed levers act on the same admission valve
once each during every revolution as shown in B¹.

page_text: LUMIDELE
DIECIFICATION,
I HERMAN KÜHNE of 34, Great Saint Helens in the City of London in the
County of Middlesex do hereby declare the nature of my Invention for IMPROVE-
MENTS IN THE EXPANSION GEAR OF STEAM ENGINES and in what manner the
same is to be performed, to be particularly described and ascertained in and by
the following statement :-
Referring to the accompanying drawings a lever E receives by attachment to an
excentric or crank a circular movement in its point b and by attachment to a bridle
rod L which swings round the firm point c a rocking movement in its point t. In
consequence the point e of the said lever E moves compulsorily in a pear shaped
curve. To the point e is attached a second bridle rod O the other end ƒ of which
is suitably connected to the governing rod M of the governor. The movement of
the point in the desired curve circular or otherwise round the point e may also be
obtained by cutting a slot into the said lever E and by a sliding block guided in
the said slot by the governing rod. To the point f of the second bridle rod O or
the said sliding. block a suitable arm G moving round the centre of either is
attached which glides with its other end in a sleeve H the said sleeve being
attached to one arm of a bellcrank or two armed lever B or B₁ the other arm of
which bellcrank or lever acts on the steam admission valve or cock or other suitable
steam admission arrangement which hereafter is called the admission valve. The
closing of the said admission valve may be effected by a weight or spring or
other suitable means. The point m at which the arm G in its movement through
the sleeve H acts on the bellcrank is determined by suitable lock nuts or otherwise.
The movement of the point b being made strictly synchronous with that of the
engine shaft and the position of the governor influencing that of the point f of the
said arm G the cut off of the steam is effected in an automatically variable but
compulsory manner earlier or later in the stroke according to the position of the
governor rod M.
The described system is usually applied twice to each steam engine cylinder that
is in pairs right and left hand or otherwise each of the two systems moving in a
direction opposite to the other the bellcranks or two armed levers B or B¹ either
acting each on a separate steam admission valve (as shown in B) once during every
revolution of the engine or both bellcranks or two armed levers viz:-B¹ and its
duplicate acting on the same admission valve once during each stroke of the engine
that is twice during each revolution in a manner similar to that shown in Fig 10
of letters patent No 2069 AD 1881 granted to Carl Pieper being a communication
from William Rudolph Proell Doctor of Philosophy of Dresden Saxony.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
The arrangement or combination of parts as and for the purpose and in the
manner substantially as herein before described.