Improvements in Locomotives for Facilitating Passing Round Curves.
Year: 1891

page_text: Date of Application, 3rd Apr., 1891-Accepted, 9th May, 1891
COMPLETE SPECIFICATION.
Improvements in Locomotives for Facilitating Passing
Round Curves.
1, CHRISTIAN HAGANS of Erfurt, Germany, Locomotive Manufacturer, 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 object of my invention is to construct locomotives with cylinders fixed on
the main-frame and with one or two bogie frames having coupled wheel axles in
such manner as to facilitate their passing round curves of comparatively small
radius. As a result of this construction the reciprocating parts are also counter-
balanced.
The object is attained by transmitting the power from the piston rod to the
connecting rod by means of double arned levers which are mounted on movable
weigh shafts which adapt their position to the curves of the road.
Fig. 1 of the accompanying drawings is a side elevation of a locomotive.
Fig. 2 is a vertical cross section half on the line, and half on the line y, y.
Fig. 3 is a plan and Figure 4 is a side view of a modification.
Figs. 5 and 6 are half plans of other modifications.
For the better understanding of the invention only such parts are indicated which
are necessary for illustrating the same.
A Figs. 1, 2 and 3 is a steam cylinder fixed on the main frame and B C a double
armed lever which at its upper end B is connected to the piston rod cross head and
at its lower end C to the connecting rod C D which takes upon the crank pin D of
the driving wheel. The levers BC are upon the centrally pivoted weigh shaft E
(or upon separate shafts) which at each outer end is supported in links FG. These
latter are suspended by their upper gudgeons F while their lower ends are controlled
by the directing rods G H. These latter are connected to the brackets H fixed
on the bogie frame. The fixed points of connecting may however be in other.
places, all depending upon the construction of the bogie truck and the other parts
which are to be applied to or arranged on same.
Thus for instance as shewn in the half plan Fig. 5 the point of connecting may
be on the pin H of a counter crank. Or as shewn in the half plan Fig. 6 the
point of connecting may be on axle bearing H. (or on the axle itself) in cases
where for constructive reasons the links F G are arranged inside of the
levers B C.
In their middle position the levers B C swing at their lower ends from K to L.
So long as the engine runs along a straight piece of road the parts take the
position indicated by capital letters. But as soon as the engine comes to a curve
the pendent links FG will by reason of the directing rods G H assume a slanting
position such for instance as indicated by Fg. And this on each side of the engine,
so that hence the shaft E which with its ends, rests in the pendent links F G will
also be put out of its normal position and assume a slanting one, or for instance as
far as indicated by the letter e¹.
The levers will thus turn on each side and hence their lower points C will not
swing from K to L but from k to l.
The rear bogic as well as the front bogie may have two cylinders as shown at
Fig. 4 or there may be only two cylinders altogether for the two bogies, or there
In the last
may be one cylinder on one side and two cylinders on the other side.
two cases one reversing gear only is necessary. The two armed levers B C may
have arms of equal or unequal lengths.

page_text: 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
First. The application and use in locomotives of double armed levers with
shifting fulcrum for the driving of the axles of the bogie trucks substantially as
set forth.
Second. The modes described and shewn for supporting the stationary end of
the directing rods G H.
Third. The arrangement of cylinders and driving gear shown on the drawings.
Dated this 3rd day of April 1891.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.