IMPROVEMENTS IN ENGINES TO BE WORKED BY STEAM
Year: 1883

page_text: LETTERS PATENT to Carl Baumgarten of Berlin in the Kingdom of Prussia
and Empire of Germany for an Invention of IMPROVEMENTS IN ENGINES TO
BE WORKED BY STEAM
PROVISIONAL SPECIFICATION left by the said Carl Baumgarten at the
Office of the Commissioners of Patents on the 18th June 1883.
CARL BAUMGARTEN of Berlin in the Kingdom of Prussia and Empire of
Germany IMPROVEMENTS IN ENGINES TO BE WORKED BY STEAM
The Invention has for its object improvements in engines to be worked by
steam, and relates to a novel construction and arrangement of parts whereby
although a crank is used dead points are avoided.
The principle of this engine consists in transmitting power from the piston to
the crank by a slide-piece A connected with the piston, said slide being slotted in
such a form that the crank, on the piston reaching the end of its stroke, has yet to
pass through an angle of 45° to reach the utmost extent of its stroke in the same
direction, while the piston is about to go back, and notwithstanding (owing to the
peculiar shape of the slot) continues to exert a pressure upon the crank-pin in the
direction of rotation, so that the engine in any given position of the crank, can be
started without any extraneous assistance.
To attain this object, the slot is in the middle thereof enlarged so as to make
the angle the slot is forming with any given position of the crank, large enough to
attain the impelling components which fall in the direction of rotation.
The alternate supply of the impelling steam is obtained by the slide valve B,
which has a central port C, and which by the rod D and the levers E and E' is
moved in such a manner, that alternately the ports F and F¹ are opened.
The levers E and E¹ are placed at the end of the stroke of the slide piece A, in
such a manner that they can be pushed by the latter so as to make the .necessary
motion for opening the slide valve.
The spring projections Y, Y¹, fixed on the levers E, E¹, can be so arranged, thab
they by striking upon the pins H, H', can produce any desired degree of expansion
to be determined in advance, as they, after the slide piece A, has gone back, cause
the lever E, or El, also to go back, and therefore the slide valve B, springs back as
far as it is necessary for the desired degree of expansion.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Carl Baumgarten in the Great Seal Patent Office on the 17th December
1883.
CARL BAUMGARTEN of Berlin in the Kingdom of Prussia and Empire of
Germany "IMPROVEMENTS IN ENGINES TO BE WORKED BY STEAM
"
The Invention has for its object improvements in engines to be worked by steam
and relates to a novel construction and arrangement of parts whereby although a
crank is used dead points are avoided. In the drawings Figure 1 is a longitudinal
section of an engine constructed according to my Invention. Figure 2 is a cross
section taken through the cylinder and slide valve and Figure 3 is a plan thereof
partly in section.
The principle of this engine consists in transmitting power from the piston to
the crank by a slide piece A connected with the piston, said slide being slotted in
such a form that the crank, on the piston reaching the end of its stroke has yet to
pass through an angle of 45° to reach the utmost extent of its stroke in the same
direction, while the piston is about to go back, and notwithstanding (owing to the
peculiar shape of the slot) continues to exert a pressure upon the crank pin in the
direction of rotation, so that the engine, in any given position of the crank can be
started without any extraneous assistance.
To attain this object, the slot is in the middle thereof enlarged so as to make
the angle the slot is forming with any given position of the crank large enough to
attain the impelling components which fall in the direction of rotation.
The alternate supply of the impelling steam is obtained by the slide valve B
which has a central port O and which by the rod D and the levers E and E¹ is
moved in such a manner that alternately the ports F and F¹ are opened.
The levers E and E¹ are placed at the end of the stroke of the slide-piece A in
such a manner, that they can be pushed by the latter so as to make the necessary
motion for opening the slide valve. The spring-projections G G¹ fixed on the
levers E E¹ can be so arranged, that they by striking upon the pins H. H' can
produce any desired degree of expansion to be determined in advance, as they,
after the slide-piece A has gone back, cause the lever E or E¹ also to go back, and
therefore the slide valve B springs back as far as it is necessary for the desired
degree of expansion.
Having thus described the nature of the said Invention and the mode in which
the same may be carried into effect I would have it understood that what I
claim is :-
First. For converting the rectilinear motion of a reciprocating steam engine
into rotary motion, the application of a slide A, connected with the piston by a rod,
the slot of which slide A is of such a shape that the crank-pin, moving therein
whatever may be its position can be impelled thereby.
Second. The application of a slide valve B with a central port C for directly
utilizing the to and fro movement of the slide A for distributing the steam by
means of the levers E and E¹ and rod D.
Third. The combination of the levers E and E¹ with the spring projections G
and G with the pins H and H₁ for producing at will, the desired degree of
expansion.
In witness whereof I the said Carl Baumgarten have hereunto set my hand
and seal this Twenty-eighth day of November in the year of our Lord One
thousand eight hundred and eighty three.