Improvements in Compound Locomotives, Compound Steam Engines, and other Compound Motors.
Year: 1895

page_text: Date of Application, 11th June, 1895-Accepted, 3rd Aug.,
1895
COMPLETE SPECIFICATION.
Improvements in Compound Locomotives, Compound Steam Engines,
and other Compound Motors.
A communication by CONRAD SONDERMANN, of
Landhaus Strasse, Stuttgart,
in the Empire of Germany, Civil Engineer.
1, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E. of The Agency for
Foreign Patent Solicitors, 6 Lord Street, Liverpool and 6 Bank Street,
Manchester both in the County of Lancaster, 118 New Street, Birmingham in
the County of Warwick and 31 High Holborn, in the County of Middlesex,
Civil 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 :-
In the ordinary arrangement of high and low pressure cylinders one above the
other such as is almost exclusively the case at present in compound locomotives
and which is also applied to other engines working by steam, compressed air and
the like, more particularly double and triple pumps and rolling mills, numerous
drawbacks are caused by the generally varying loads of the piston rods being
transferred to one cross head and from there by means of only one common driving
or connecting rod to only one of the cranks.
These drawbacks, which consist of bending strains on the cross head and piston
rods, whereby a breakage of these parts is frequently caused, are removed by the
present invention.
The invention will now be described with reference to the accompanying
drawings, in which—
Figures 1, 2, 3, and 4 are diagrams, there being for each of the cylinders C¹ C'
a driving or connecting rod T¹ and T₁ respectively, each of which engages at one
end in the cross head of its respective piston rod, but at its rotating end is not
connected with the cranks but with pins on projections A¹ A² of the coupling
rod K. The load or pressure on the piston rods is thereby equal and is conveyed
in an advantageous manner to two crank pins. The driving rods T¹ T and the
coupling rod K lie in one plane of force. Other coupling rods may branch off
from the cranks or from the coupling rod on one or both sides. The pro-
jections A¹ A may also lie outside the centre of the coupling rod, or be placed at
one end of the same. As shown in Figure 1, these projections may be made of
different lengths. Finally one of the projections may also form a continuation or
extension of the coupling rod (Figure 3), or both driving rods may engage on the
same side of the coupling rod as shown in Figure 4.
In the case of cylinders arranged at an angle to the horizontal (see Figure 1)
the same inclination must be allowed for in the projections A' A' or in other words
these projections must be suitably adjusted to one another.
In the diagrams shown on the drawings a separate cross head is assumed for
each piston rod and driving rod, but a common cross head may however also serve
for both piston rods, having its guide support either outside the piston rods as
shown in Figure 2, or between the same as shown in Figure 1.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is
-
The improvement in compound locomotives, compound steam engines and other

page_text: compound motors with high and low or equal pressure cylinders arranged one
above the other, consisting in conveying the pressure of the piston rods by means
of a separate driving rod for each of the piston rods to separate pins which are
firmly connected with the coupling rod but lie outside the same, substantially as
hereinbefore described.
Dated this 10th day of June 1895.
WM. P. THOMPSON & Co.,
Agents.