Engineer's Safety-Throttle for Locomotive Dry Pipes Page: 2 of 3
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UNITED STATES PATENT OFFICE.
JOHN WESLEY HARTMAN, OF HOUSTON, TEXAS, ASSIGNOR OF ONE-HALF TO HENRY T.
DOBBINS, OF LAFAYETTE, LOUISIANA.
ENGINEER'S SAFETY-THROTTLE FOR LOCOMOTIVE DRY PIPES.Specification of Letters Patent.
Patented Nov. 16, 1920.
Application filed Tune 21, 1919. Serial No. 305,788.
To all whom it may concern:
Be it known that I, JOHN W. HARTMAN,
a citizen of the United States, residing at
Houston, in the county of Harris and State
5 of Texas, have invented certain new and
useful Improvements in Engineer's Safety-
Throttles for Locomotive Dry Pipes, of
which the following is a specification, refer-
ence being had to the accompanying draw-
10 ings.
This invention relates to locomotive en-
gines, and particularly to the dry pipe
thereof.
The general object of this invention is to
15 provide a valve whereby the entrance of
steam to the dry pipe of a locomotive engine
may be cut 6ff in case of derailment and
eliminate any possible chance for accident
from escaping steam, and which will further
20 permit repairs being made on pipe connec-
tions to air pump, injector, etc., while steam
is kept up in the boiler.
A further object is to provide a construc-
tion of this kind which is very simple, may
25 be readily applied to locomotives now in
use, and which may be also used with sta-
tionary engines.
Other objects will appear in the course of
the following description.
30 My invention is illustrated in the accom-
panying drawings, wherein:-
Figure 1 is a longitudinal sectional view
of a locomotive boiler provided with my dry
pipe throttle; and
35 Fig. 2 is a fragmentary sectional view of
the inlet end of the dry pipe and the valve
therefor.
Referring to these drawings, 10 designates
the boiler of a locomotive engine having the
40 usual steam dome 11. From this steam dome
extends the usual throttle stand pipe 12, the
entrance of steam to which is controlled by
the throttle valve 13 operated by the throt-
tle valve rod 14 extending to the throttle
45 valve handle 15 into the cab of the locomo-
tive.
Extending from the steam dome 11 into
the cab is the usual dry pipe 16 which is
provided within the steam dome with two
50 inlet valve seats 17, two valves 18 seating
simultaneously on the seats, and mounted
upon a valve spindle 19. This valve spindle
in turn is mounted upon a bell crank lever
20, pivotally connected to a throttle valve
55 operating rod 21 extending longitudinallythrough the boiler and through the front
sheet thereof and pivotally connected to an
operating lever 22. The bell crank 20 is
mounted on a bracket 23.
Normally the throttle valves 18 are open 60
so that the dry steam will pass into the
fountain dry pipe 16 and thence into the
steam fountain 24 and then into the steam
pipes, injector, etc. It will be seen that my
mechanism provides a safety device which, 65
in case of derailment, will protect the engine
crew from being injured by escaping steam.
The throttle valve lever 22 can be readily
operated in case of accident to thereby close
the throttle and cut off the steam at the 70
entrance of the fountain dry pipe. This
eliminates all possible chance of accident
from escaping steam in case of broken pipes
in the cab except, of course, the bottom and
top water glass cocks and the gage cocks. 75
Furthermore this throttle valve can be
closed in case repairs are to be made on the
pipe connections to the air pump and in-
jector without reducing the pressure of
steam in the boiler. At the present time, in 80
case these repairs have to be made, the steam
has to be allowed to escape from the boiler
or the fires drawn. It will be obvious that
this device is very simple in construction,
that it may be readily installed on all loco- 85
motives using a dry pipe with but little
extra expense, and that it is thoroughly ef-
fective for the purpose intended.
I claim:-
1. A locomotive having a steam dome and 90
a fountain dry pipe extending rearward
from the steam dome and disposed within
the boiler and opening at its rear end at the
rear end of the boiler, said dry pipe within
the dome being formed with two alined 95
valve seats constituting ports opening into
the dome, a pair of valves controlling inlet
through said seats, a bell crank operatively
connected to the stem of said valves, a rod
operatively connected to the valves to shift 100
them to cause the opening or closing of the
valves as the rod is shifted, said rod extend-
ing rearwardly through the boiler sheet of
the locomotive, and a handle disposed ex-
teriorly of the rear end of the boiler in 105
immediate proximity to the throttle valve
handle for operating the rod.
2. A locomotive having a boiler and a
steam dome, a throttle valve handle at the
end of the boiler, a fountain dry pipe ex- 1101,358,844.
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Hartman, John Wesley. Engineer's Safety-Throttle for Locomotive Dry Pipes, patent, November 16, 1920; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1256438/m1/2/: accessed June 28, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.