Improvements in or relating to the Tubes of Locomotive or other Tubular Boilers.
Year: 1888

page_text: Date of Application, 6th Dec., 1888
Complete Specification Left, 28th Aug., 1889-Accepted, 5th Oct., 1389
PROVISIONAL SPECIFICATION
Improvements in or relating to the Tubes of Locomotive or other
Tubular Boilers.
I FRANCIS HOLT of Spondon near Derhy in the County of Derby Engineer, do
hereby declare the nature of this Invention to be as follows:-
It is customary to make the tubes in locomotive and certain other boilers of brass
or copper and it is to tubes of these metals that my Invention is chiefly applicable,
the principal objects of my improvements being first, to dispense with the ordinary taper
ferrules employed to secure the tubes in position in the tube plate at the firebox end,
and secondly to increase the durability of the tubes by protecting them at the point
where they are subjected to the greatest heat.
Those conversant with locomotive boilers are well aware of the injury caused to the
tube plate at the firebox end by repeatedly driving in the aforesaid ferrules to secure
the tubes this operation being frequently necessary on account of the ferrules
working loose through expansion and contraction of the tubes. It is also well
known that the tubes are quickly burnt through from the inside at a point near
to, the fire-box on account of the excessive heat to which they are exposed at that
point.
In carrying my Invention into effect I set each brass or other boiler tube in
position in the tube plate at the firebox end and with an expanding mandrel or
other suitable tool 1 expand the tube until it is fixed in its hole in the tube plate.
I then insert into the fire box end of the tube a short length, say about six inches,
of steel or iron tube of such a diameter that it will fit snugly inside the boiler
tube. The inner or lining tube when in position is next expanded with an
expanding tool and so firmly secures the tube in the plate thus dispensing with the
ordinary ferrule.
By my improvements the tubes are thoroughly secured in a simple practical
manner without injury to the tube plate and should the tube or tubes leak afterwards
from slackness in the plate I again expand them and thereby dispense with the rough
usage common when the ordinary ferrule is driven in by hammer.
The lining tube projects far enough through the tube plate inside to protect the
brass tube from the great heat and consequent rapid destruction and is bevelled
at the inner end to a feather edge so as to enable the tube cleaning rod to pass
through from the smoke box end without obstruction.
D
1000
COMPLETE SPECIFICATION.
Improvements in or relating to the Tubes of Locomotive or other
Tubular Boilers.
I, FRANCIS HOLT, of Spondon near Derby in the County of Derby, 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:
It is customary to make the tubes in locomotive and certain other boilers of brass
or copper and it is to tubes of these metals that my invention is chiefly applicable, the
principal objects of my improvements being first to dispense with the ordinary taper
ferrules employed to secure the tubes in position in the tube plate at the firebox end,
and secondly to increase the durability of the tubes by protecting them at the point
where they are subjected to the greatest heat.

page_text: Those conversant with locomotive boilers are well aware of the injury caused to
the tube plate at the fire box end by repeatedly driving in the aforesaid ferrules
to secure the tubes this operation being frequently necessary on account of the
ferrules working loose through expansion and contraction of the tubes. It is also
well known that the tubes are quickly burnt through from the inside at a point
near to the firebox on account of the excessive heat to which they are exposed at that
'point.
10.
And in order that my invention may be fully understood and readily carried into
effect I will describe the accompanying Sheet of Drawings reference. being had to the
figures and letters marked thereon.
Figure. 1 is a sectional elevation and Fig. 2 an end view of a portion of the. fire
box tube plate of a boiler illustrating my improved mode of securing tubes according
to my invention.
In these views a designates part of the fire box tube plate of the boiler, & three of
the boiler tubes and c the lining tubes.
C.
In carrying my invention into effect I set each brass or other boiler tube b.in
position' in the tube plate a at the firebox end and with an expanding mandrel or other
suitable tool I expand the tube b until it is fixed in its hole in the tube plate as shown
at A. 1 then insert into the firebox end of the tube, a short length, say about six
inches, of steel or iron tube c of such a diameter that it will fit snugly inside the
hoiler tube, as shown at B. The inner or lining tube c when in position is next
expanded with an expanding tool and so firmly secures the tube in the plate a as
shown at C thus dispensing with the ordinary ferrule.
By my improvements the tubes b are thoroughly secured in a simple practical
manner without injury to the tube plate a and should the tube or tubes leak
afterwards from slackness in the plate I again expand them and thereby dispense
with the rough usage common when the ordinary ferrule is driven in by hammer.
Instead of employing steel or iron lining tubes e as described I might employ
tubes of plumbago or other suitable refractory material and secure them in position
by fire clay or the like instead of by expansion as above mentioned.
The lining tube c projects far enough through the tube plate inside to protect
the brass or other tube 6 from the great heat and consequent rapid destruction
and is bevelled at the inner end c¹ to a feather edge so as to enable the tube,
cleaning rod to pass through from the smoke box and without obstruction.
lining tube also prevents the excessive evaporation from fracturing the boiler tube
just insido the tube plate.
The
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
The combination with the ordinary brass or other tubes of a locomotive or other
tubular boiler, of the steel or other lining tubes c substantially as and for the purposes
herein described and as illustrated by the accompanying Drawing.
11
301
H. B. BARLOW,
17, St. Ann's Square, Manchester, Agent for Applicant.