Improvements in and relating to Locomotive Steam Blast Pipes.
Year: 1899

page_text: Date of Application, 4th Nov., 1899-Accepted, 13th Jan., 1900
COMPLETE SPECIFICATION.
Improvements in and relating to Locomotive Steam Blast Pipes.
I, OTTO HORENZ, of No. 43, Pfotenhauer Strasse, Dresden, in the German
Empire, Manufacturer, do hereby declare the nature of this invention and in
what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement.-
The present invention relates to an apparatus which increases automatically
the sectional area of the outlet of the blast pipe of locomotives whenever the
steam cylinder works with more steam or greater pressure and consequently at
a greater speed than usual In this manner a double advantage is obtained. In
the first place an excess of draught 18 avoided, which injures the fine and also
incurs the danger of causing forest fires or the like by small pieces of red-hot
coal violently ejected. Moreover the invention is also employed with advan-
tage for diminishing the increased back-pressure of the steam when the amount
of the supply 18 greater than usual because the area of the outlet pipe for the
steam becomes laiger automatically Consequently the back-piessuie line in
the indicator diagiam sinks and its surface, and consequently the work developed
by the steam, increases
Figure 1 of the accompanying drawing shows an arrangement in which an
extra outlet usually closed is opened automatically when the supply is increased.
Figures 24 illustrate arrangements in which no extra pipe 18 necessary
Figures 5, 6 and 7 show another modification of the invention in two different
positions and in plan view
To one of the two pipes a, through which the steam reaches the single blast-
pipe 6, 18 joined the pipe e forming an extra outlet, which does not discharge
into the funnel but duectly into the open an
This extra outlet is usually shut off from the pipe a by means of an auto-
matic spring or weighted valve d and the like. This valve can also be applied
however outside the smoke chamber, therefore duectly to the cylinder.
When the pressure in the pipe a 11ses above a certain limit, the extra out-
let 18 opened and a certain quantity of the steam escapes through it
In the forms of construction illustrated in Figures 2 to 7 the end of the blast
pipe 18 movable so that it can rise or open automatically under the influence of
the increased pressure of steam It may consist of one piece e (Figure 2) or
else of two halves f (Figure 3) and so forth
In the modification illustrated in Figures 5, 6, and 7 the exhaust-end 9 can
move vertically, suitable guides h which are mounted on the cylindrical part
and serve as weights at the same time, provide for its return to the right posi-
tion when the pressure of steam is reduced.
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.
Apparatus for automatically increasing the outlet area of the blast pipe of
locomotives characterized by the arrangement either of a valve (d) or the like

page_text: which opens automatically under the quantity of steam from the cylinder or of
a greater pressure in consequence of greater speed of the engine, which connects
a usually closed extra outlet (c) with the pipe a coming from the boiler, or bv
the arrangement of a valve in the blast pipe which 11ses under increased pres-
sure and thereby increases the outlet area for the steam, so that neither the
back pressure of the steam nor the draught are substantially increased.
Deted the 4th day of November 1890
WM. P. THOMPSON & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicant