Improvements relating to the Blast Pipes of Locomotives.
Year: 1890

page_text: Date of Application, 13th Aug., 1890
Complete Specification Left, 13th May, 1891-Accepted, 13th June, 1891
PROVISIONAL SPECIFICATION.
Improvements relating to the Blast Pipes of Locomotives.
I, WILLIAM ADAMS of the Engineers Office L. & S. W. Ry. Co.'s Locomotive
Works Nine Elms in the County of Surrey Locomotive Engineer, do hereby
declare the nature of this invention to be as follows:-
This invention relates to the blast pipes of locomotives; the orifice is annular
and is so arranged that the area of its aperture can be varied.
The pipes conveying the exhaust steam from the two cylinders enter at the
bottom of the smoke box on either side and are brought together in the middle and
united into a trunk which is somewhat flattened on the sides so that it may interfere
as little as may be with the access to the boiler tubes necessary for cleaning.
There is a passage through the blast pipe transversely from side to side and from
the top of this passage a tube or core rises vertically within the upper part of the
blast pipe and concentric with it. The steam issues by the annulus between the
mouth of the blast pipe and the upper end of the core. The products of combustion
at the same time are drawn through the transverse passage and delivered by the
hollow core in the middle of the annular steam blast.
The adjustment of the annulus is effected by means of a ring sliding on the
exterior of the core, this ring is coned on the outside and the mouth of the blast
pipe is similarly coned within.
By raising this ring upon the core the area of the annular orifice is reduced
whilst by lowering the ring the area is increased.
A. rod is arranged vertically within the core and the ring is connected with it
This rod is
by arms which extend over the mouth or upper end of the core tube.
connected with a cross bar carried by arms on an horizontal axis mounted in
bearings at the front of the blast pipe. The axis is continued through the side of
the fire box and here there is another arm upon it from which a rod extends to the
foot plate or furnace end of the boiler. A hand wheel and screw is provided in
connection with the rod and so arranged that by turning the hand wheel the cone
ring in the blast pipe can be raised or lowered. An indicator upon the rod shews
the area of the annulus provided for the escape of the exhaust steam.
In order that my said invention may be fully understood and readily carried into
effect I will proceed to describe the drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a transverse vertical section and Figure 2 is a longitudinal vertical
section of the smoke box end of a locomotive boiler with the adjustable annular
blast pipe within it. Figure 3 shews the regulating apparatus at the fire box end.
a is the barrel of the boiler, a' a' are fire tubes, is the smoke box, c is the
chimney. dd are the exhaust steam pipes. e is the trunk or pipe in which they
unite. is the transverse passage through the blast pipe and the hollow core.
These parts it will be seen are so arranged that whilst the steam ascends within the
blast pipe outside of and around the hollow core, the products of combustion enter
the passage on either side and ascend and are delivered through the interior of
and
is the cone ring which can slide upon the exterior of the core
which regulates the width of the annulus between its exterior and the interior of
the coned mouth e' of the blast pipe. The narrower the annulus is made the
greater the velocity of the steam issuing through it and the more efficient the blast
in drawing the products of combustion up the hollow core and expelling them into
the core.

page_text: is a rod within the core g, it is fixed to radial arms with which the
ring his provided. is a cross bar at the lower end of the rod, it is carried by
the arms on the axis . . are bearings upon the blast pipe in which the
axis is mounted. 12 is an arm on the outer end of the axis and m is a rod
leading from the arm 2 to the fire box end of the boiler where it is jointed to a
screw n. The screw is received into a screw nut o which is carried in a bearing p
and can be turned by means of the hand wheel 7. The screw n cannot turn but
travels endwise within the nut. is a pointer fixed to the rod m, it works along a
scale graduated on the bearing p and indicates the area of the annulus available
for the escape of the steam.
Dated this 0th day of
1900
COMPLETE SPECIFICATION.
Improvements relating to the Blast Pipes of Locomotives.
I, WILLIAM ADAMS, of the Engineers Office L. & S. W. Ry. Co.'s Locomotive
Works, Nine Elms, in the County of Surrey, Locomotive Engineer, 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 the blast pipes of locomotives; the orifice is annular
and is so arranged that the area of its aperture can be varied.
The pipes conveying the exhaust steam from the two cylinders enter at the
bottom of the smoke box on either side and are brought together in the middle
and united into a trunk which is somewhat flattened on the sides so that it may
interfere as little as may be with the access to the boiler tubes necessary for
cleaning. There is a passage through the blast pipe transversely from side to side
and from the top of this passage a tube or core rises vertically within the upper
part of the blast pipe and concentric with it. The steam issues by the annulus
hetween the mouth of the blast pipe and the upper end of the core. The products
of combustion at the same time are drawn through the transverse passage and
delivered by the hollow core in the middle of the annular steam blast.
The adjustment of the annulus is effected by means of a ring sliding on the
exterior of the core, this ring is coned on the outside and the mouth of the blast
pipe is similarly coned within.
By raising this ring upon the core the area of the annular orifice is reduced
whilst by lowering the ring the area is increased.
A rod is arranged vertically within the core and the ring is connected with it by
arms which extend over the mouth or upper end of the core tube. This rod is
connected with a cross bar carried by arms on an horizontal axis mounted in
bearings at the front of the blast pipe. The axis is continued through the side of
the smoke box and here there is another arm upon it from which a rod extends to
the foot plate or furnace end of the boiler. A hand wheel and screw is provided
in connection with the rod and so arranged that by turning the hand wheel the
cone ring in the blast pipe can be raised or lowered. An indicator upon the rod
shows the area of the annulus provided for the escape of the exhaust steam.
In order that my said invention may be fully understood and readily carried
into effect I will proceed to describe the accompanying drawings.
Decan

page_text: and
chimney, dd are the exhaust steam pipes. e is the trunk or pipe in which they
unite. is the transverse passage through the blast pipe and the hollow core.
These parts it will be seen are so arranged that whilst the steam ascends within
the blast pipe outside of and around the hollow core, the products of combustion
enter the passage on either side and ascend and are delivered through the interior
of the core.
is the cone ring which can slide upon the exterior of the core g
which regulates the width of the annulus between its exterior and the interior of
the coned mouth of the blast pipe. The narrower the annulus is made the
greater the velocity of the steam issuing through it and the more efficient the blast
in drawing the products of combustion up the hollow core and expelling them into
the chimney.
The
i is a rod within the core g, it is fixed to radial arms with which the
ring is provided. A is a cross bar at the lower end of the rod, it is carried by the
arms on the axis 1. are bearings upon the blast pipe in which the axis /
is mounted. is an arm on the outer end of the axis and m is a rod leading from
the arm to the fire box end of the boiler where it is jointed to a screw .
screw is received into a screw nut o which is carried in a bearing p and can be
turned by means of the hand wheel y. The screw n cannot turn but travels endwise
within the nut. is a pointer fixed to the rod m, it works along a scale graduated
on the bearing p and indicates the area of the annulus available for the escape of
the steam.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A blast pipe having an annular orifice the area of which is adjustable by
means of a coned ring which can be slidden up or down within the blast pipe and
upon its central hollow core.
2. A. blast pipe with annular orifice central hollow core; adjusting ring;
and lateral or side passages by which the combustion products are admitted to the
hollow core.
3. A blast pipe with annular orifice; central hollow core adjusting ring sliding
upon the core; a rod within the core connected with the ring by arms extending
over the top of the core and gearing coupling the rod with regulating apparatus
within reach of the engine driver.
Dated this 11th day of No 1801