Improvements relating to the Blast Pipes of Locomotive and other High Pressure Engines.
Year: 1888

page_text: Date of Application, 22nd Nov., 1888
Complete Specification Left, 22nd Aug., 1889-Accepted, 28th Sept., 1889
PROVISIONAL SPECIFICATION.
Improvements relating to the Blast Pipes of Locomotive and other
High Pressure Engines.
We, CHARLES ADAMS of 35 Queen Victoria Street, London and GEORGE MACALLAN
of Earlham Grove, Forest Gate, London, E. Engineers, do hereby declare the nature
of this invention to be as follows:-
On locomotive and other high pressure engines the exhaust steam from the cylinders
passes through a blast pipe at high velocity exhausting air and gases from the smoke
box and causing draught through the tubes and furnace. The nozzle of the blast
pipe is generally of a fixed area for each class of engine.
In carrying our invention into practice e arrange at the end of the blast pipe a
conical cap with an outlet smaller in area tuan that of the end of the blast pipe. It
is attached to the blast pipe by a hinged joint which allows the cap to fall over clear
of the end of the blast pipe when the velocity and friction of the steam passing
through it is greater than required to cause sufficient draught.
The arrangement is such that the cap hinges over in front of the main blast pipe
where it is easily seen and got at and the deposit which is formed and clogs up the
outlet of blast pipes to a mischievous extent can be easily removed.
We also arrange that the cap is coupled to a lever and rod so that the driver
or fireman may, at will from the footplate, bring the smaller or larger outlet
into use.
We also arrange that the blast pipe gear works automatically with the expansion
gear so that when the engine is working expansively the outlet is of the smaller area
and when it is working in or near full gear it is of the larger area preventing excessive
draught and consequent waste of fuel, emission of sparks, wear and tear of fire-box,
tubes, smoke-box and chimney also reducing back pressure.
Dated this 99nd dow of November 1888
CARPMAEL & Co.,
Agents.
COMPLETE SPECIFICATION.
Improvements relating to the Blast Pipes of Locomotive and other
High Pressure Engines.
We, CHARLES ADAMS, of 35 Queen Victoria Street, London, and GEORGE MACALLAN,
of Earlham Grove, Forest Gate, London, E., Engineers, 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:-
On locomotive and other high pressure engines the exhaust steam from the cylinders
passes through a blast pipe at high velocity exhausting air and gases from the sinoke
box and causing draught through the tubes and furnace. The nozzle of the blast
pipe is generally of a fixed area for each class of engine.
In carrying our invention into practice we arrange at the end of the blast pipe a
conical cap with an outlet smaller in area than that of the end of the blast pipe. It
is attached to the blast pipe by a hinged joint which allows the cap to fall over clear
of the end of the blast pipe when the velocity and friction of the steam passing
through it is greater than required to cause sufficient draught.
The arrangement is such that the cap hinges over in front of the main blast pipe
where it is easily seen and got at and the deposit which is formed and clogs up the
outlet of blast pipes to a mischievous extent can be easily removed.

page_text: We also arrange that the cap is coupled to a lever and rod so that the driver
or fireman may, at will from the footplate, bring the smaller or larger outlet
into use.
In order that our said invention may be fully understood and readily carried into
effect we will proceed to describe the drawings hereunto annexed.
we
DESCRIPTION OF THE DRAWINGS..
Figure 1 is a vertical section and Figure 2 is a plan.
a is the ordinary fixed blast pipe. is the moveable conical cap or nozzle which
provide. We connect this cap or nozzle with the blast pipe by a hinge joint.
a a are lugs on the pipe a and b bare lugs on the cap. c is a joint pin passing
through the lugs, it is free to turn in the lugs a' but is fast with the lugs 6. d is a
slotted arm fixed on the joint pin c; it receives a stud on the upper end of another
lever arm upon an horizontal axis below and this latter axis can be turned by any
convenient arrangement of gear moved by the engine driver from the footboard of
the engine.
In this way when desired the cap b can be lifted from the top of the pipe a
and moved forward out of the way, turning about the joint pin c.
Again when
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
the engine driver desires the cap can be replaced on the top of the blast pipe.
1. The moveable cap or nozzle b substantially as described which can when required
be placed on the top of the blast pipe a and removed out of the way when it is no
longer wanted.
2. The combination of parts a b and c substantially as described.
CHARLES ADAMS.
G. MACALLAN.