Improvements in and relating to Lifting-valves for Steam-engines.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in and relating to Lifting-valves for Steam-engines.
I, RUDOLF HEINRICH MANTEL, Consul of the Republic of Switzerland in Riga,
Russia, do hereby declare the nature of this invention to be as follows;-
This invention relates to improvements in lifting-valves for steam engines and
more particularly relates to the combination with a steam-distributing lifting-
valve, of any known construction, for example such as. are used in steam-
engines in place of slide-valves, of a latch-lever arranged tangentially to a curved
surface which acts as a variable fulcrum for the said latch-lever.
I am aware that similar tangential levers bearing on a curved surface acting
as a variable fulcrum, have already been used in steam-distributing lifting-valves
acted upon by eccentrics, that is to say, by a positive controlling means, but my
invention resides in the combination of such a tangential lever bearing on a
curved surface acting as a variable fulcrum, with a steam-distributing-lifting-
valve which is normally closed by means of a spring and the opening of which
is caused by the reciprocating motion of a snapper which, according to the
position of the regulator of the engine, engages more or less with the said
latch-lever and thus lifts the corresponding distributing-valve more
accordingly.
or less
Moreover, in combination with the said lifting valve, preferably operating
thereon through the tangential lever, arrange an air- or liquid-brake or dash-
pot checking or governing the motion of the valve.
The accompanying drawing illustrates, by way of example, one form of appli-
cation of the invention.
1 is the stem or rod of a steam-distributing lifting-valve, of any suitable con-
struction, which is Lormally closed by means of a spiral-spring i.
2 is the latch-level hinged to the said stem or rod 1 and arranged to have its
end 4 engaged from time to time by the nose 8 of a snapper 9 hinged at 10 to
one end of a crank 11 the other end of which is hinged to a fixed pivot 12. The
snapper 9 is acted upon by a spring 13 and is reciprocated by means of the
eccentric-rod 14.
The lever 2 bears tangentially upon a curved surface
fulcrum for the same, and is connected by means of
air or liquid brake or dash-pot intended to control
spring 7.
3, which acts as a variable
link 5 to a piston 6 of an
the action of the spiral
Accordingly as the snapper 9 depresses more or less the end 4 of the latch-
lever 2, the two arms of the same, the lengths of which are determined by the
point in which the edge of the tangential lever 2 is in contact with the curved
surface 3, vary in length; the length of the lefthand arm of said lever will
decrease the length of the righthand arm will increase as the steam-valve is lifted,
and vice versa. Now from this it results that the left-hand arm of the said
lever 2 will increase proportionately to the depression of the valve-rod 1 and that

page_text: therefore the brake 6 will act with its greatest intensity at about the time the
said valve reaches its seat when thrown back thereon by the spiral spring 7.
Dated this 20th day of October 1899.
D. YOUNG & Co.,
11 & 12, Southampton Buildings, London, W.C.,
Agents for the Applicant.
Improvements in and relating to Lifting-valves for Steam-engines.
I, RUDOLF HEINRICH MANTEL, Consul of the Republic of Switzerland in Riga,
Russia, 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:
This invention relates to improvements in lifting-valves for steam engines and
more particularly relates to the combination with a steam-distributing lifting-
valve, of any known construction, for example, such as are used in steam-
engines in place of slide-valves, of a latch-lever arranged tangentially to a curved
surface which acts as a variable fulcrum for the said latch-lever.
I am aware that similar tangential levers bearing on a curved surface acting
as a variable fulcrum, have already been used in steam-distributing lifting-valves
acted upon by eccentrics, that is to say, by a positive controlling means, but my
invention resides in the combination of such a tangential lever bearing on a
curved surface acting as a variable fulcrum, with a steam-distributing lifting-
valve which is normally closed by means of a spring and the opening of which
is effected by the reciprocating motion of a snapper or catch lever which, according
to the position of the regulator of the engine, engages more or less with the said
latch-lever and thus lifts the corresponding distributing-valve more or less
accordingly.
Moreover, in combination with the said lifting valve, preferably operating
thereon through the tangential lever, I arrange an air- or liquid-brake or dash-
pot checking or governing the motion of the valve.
Referring to the drawing accompanying my Provisional Specification which
drawing illustrates, by way of example, one form of application of the invention.
1 is the stem or rod of a steam-distributing lifting-valve, of any suitable con-
struction, which is normally closed by means of a spiral-spring 7.
2 is the latch-lever hinged to the said stem or rod 1 and arranged to have its
end 4 engaged from time to time by the nose or catch S of a snapper or catch lever
hinged at 10 to one end of a crank 11 the other end of which is hinged to a fixed
pivot 12. The snapper 9 is acted upon by a spring 13 and is reciprocated by
means of the eccentric-rod 14.
The lever bears tangentially upon a curved surface 3, which acts as a variable
fulcrum for the same, and the said lever is connected by means of a link 5 to
the piston 6 of an air or liquid brake or dash-pot intended to control the action
of the spiral spring 7.
Accordingly as the snapper 9 depresses more or less the end 4 of the latch-
lever 2, the two arms of the same, the lengths of which are determined by the
point at which the edge of the tangential lever 2 is in contact with the curved
surface 3, vary in length; the length of the left-hand arm of said lever will de-
crease and the length of the right-hand arm will increase as the steam-valve is lifted
and vice versa, when the steam-valve is lowered. Now from this it results that
the left-hand arm of the said lever 2 will increase proportionally to the depression

page_text: of the valve-rod 1 and that therefore the brake 6' will act with its greatest
intensity at about the time the said valve reaches its seat when thrown back
thereon by the spiral spring 7.
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. In steam-distributing lifting-valves for steam engines the combination, with
the valve-rod or stem, of a latch-lever hinged with one end to the said rod or
stem and acted upon by means of any suitable snapper, a curved surface upon
which the said latch-lever bears tangentially, and an air- or liquid-brake or dash-
pot acting upon the other end of the said lever with an increasing intensity of
force as the said valve descends upon its seat, substantially as shown and
described.
2. An improved lifting-valve substantially as described with reference to the
drawing and operating as, and for the purpose, specified.
אתר
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1000
D. YOUNG & Co.,
11 & 12, Southampton Buildings, London, W.C.,
Agents for the Applicant.