Year: 1886

page_text: Date of Application, 14th Aug., 1886.
Complete Left, 11th May, 1887.
Complete Accepted, 14th June, 1887.
I, HERMANN KÜHNE, of 25-35 New Broad Street in the City of London in the
county of Middlesex Engineer do hereby declare the nature of my said invention to
be as follows:-
In order to ensure constant lead of a variable expansion valve curved links
coupled to one eccentric have been used the strap of the said eccentric being at a
suitable point attached to a bridle rod the other end of which bridle rod was moveably
attached to a fixed point. The same purpose can however be obtained by using a
straight link if care is taken that the point to which the said bridle rod is attached at
its one end is not fixed but receives a suitable movement opposite and simultaneous
to that which the nut receives from the governor or expansion rod. In that case it
is important that the curved link and nut can be replaced by a straight and preferably
round bolt surrounded by a sleeve to which the eccentric rod is attached. Referring
to the illustration E is an eccentric the strap K of which is attached to the bridle
rod B. in the point P. The said bridle rod B is at its point Plattached to the two
armed lever L the said two armed lever having its fulcrum at F and. being connected
in its point Q by means of another bridle rod Ň with the eccentric rod T.
It is thus evident that if the two armed lever L receives an up or down movement
from a governor rod or drag link G the sleeve S will receive a movement in one
direction and the eccentric strap K with the rod R attached thereto a proportionate
movement in the opposite direction the result being that the sleeve S follows the
movements of the governor rod or drag link G within a predetermined curve similar
to that as if the rod R formed such curve itself and the bridle rod B were attached to
the point F instead of P¹.

page_text: I HERMANN KÜHNE of 25-35 New Broad Street in the City of London in the
county of Middlesex, Engineer, do hereby declare the nature of my invention for
IMPROVEMENTS 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 :-
In order to ensure constant lead. of a variable expansion valve curved links coupled
to one eccentric have been used, the strap of the said eccentric being at a suitable
point attached to a bridle rod the other end of which bridle rod was moveably
attached to a fixed point. The same purpose can however be obtained by using a
straight link if care is taken that the point to which the said bridle rod is attached at
its one end is not fixed, but receives a suitable movement opposite and simultaneous
to that which the nut receives from the Governor or expansion rod. In that case it is
important that the curved link and nut can be replaced by a straight and preferably
round bolt surrounded by a sleeve to which sleeve the eccentric rod is attached.
Referring to the illustration filed with the provisional application E is an eccentric
the strap K of which is attached to the bridle rod B in the point P. The said bridle
rod B is at its point P¹ attached to the two armed lever L the said two armed lever
having its fulcrum at F and being connected in its point Q by means of another bridle
rod N with the eccentric rod T.
It is thus evident that if the two armed lever L receives an up or down movement
from a Governor rod or drag link G the sleeve S will receive a movement in one
direction and the eccentric strap K with the bolt R attached thereto a proportionate
movement in the opposite direction the result being that the sleeve $ follows the
movements of the Governor rod or drag link G within a predetermined curve similar
to that as if the bolt R formed such curve itself and the bridle rod B were attached to
the point F instead of P¹.
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 :
1. The combination of an expansion gear wherein the bridle rod of an eccentric
strap is attached at that end upon which the said bridle rod oscillates to a point on a
two armed lever the said point being outside that is not concentric with the fulcrum
of the said two armed lever while another suitable point on the opposite arm of the
said two armed lever is suitably connected with an expansion or valve rod which
expansion or valve rod is coupled to a guide or sleeve which guide or sleeve slides on
a bar or rod and the said bar or rod having the shape of a straight and preferably
round bolt, substantially as described and drawn.
2. The combination of the above arrangement with any suitable kind of valve or
valves for regulating the distribution of steam.
Loudon 11th dow of Ma. 1907
HERMANN KUHNE.