Improvements in Boilers.
Year: 1891

page_text: Date of Application, 26th Aug., 1891
Complete Specification Left, 20th May, 1892-Accepted, 25th June, 1892
PROVISIONAL SPECIFICATION:
Improvements in Boilers.
We, CHARLES LOXTON JACKSON of Wharf Foundry, Engineer, and
STANLEY RIDINGS of 27 Tonge Moor Road, Boiler Maker, both of Bolton in the
County of Lancaster, do hereby declare the nature of our said invention to be as
follows:-
This invention relates to improvements in boilers and is equally applicable to
what are known as Lancashire, Cornish, tubular, portable, and other types of steain
boilers and others, such as those for stoving, drying, boiling, and other purposes,
and has for its object that of increasing the heating surface of the flues or furnaces
and the evaporative power of the same, also to provide means to facilitate expansion.
and contraction of the flues without the detrimental results experienced hitherto
with what are known as "bowling hoops" and flanged joints. It is well known that
owing to sharp corners. or acute angles in "bowling hoops " and flanged joints
employed for jointing the flue rings of boilers that they frequently crack by the
continual strain of expansion and contraction, and owing to the inefficiency of the
latter they groove the boiler ends and crack the angle irons.
Our invention is designed to entirely dispense with these defects which we effect
by employing at each joint or otherwise an annular or U shaped ring, with equal
or unequal sides, to which the flanged ends of the flue rings are rivetted. This
form of expansion ring allows of boiler flues being constructed so that the rivets are
outside or otherwise, and free from the action of fire or flame. This improved
annular expansion hoop can be constructed with an even or uneven or corrugated
outer surface to facilitate expansion and contraction. The said hoops can be of any
desired depth and project beyond the surface line or inner circle of the flue rings
to increase the heating or impinging surface of the flue, by which the evaporative
power of the boiler will be considerably increased This invention will dispense
with the collection of soot and other deposits in the flues as is the case with
bowling hoops."
"
Dated the 25th August 1891.
EDMUND CHADWICK,
Agent.
COMPLETE SPECIFICATION.
Improvements in Boilers.
We, CHARLES LOXTON JACKSON of Wharf Foundry, Engineer, and
STANLEY RIDINGS of 27 Tonge Moor Road, Boiler Maker, both of Bolton in the
County of Lancaster, do hereby declare the nature of our said 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 improvements in boilers and is equally applicable to what
are known as Lancashire, Cornish, tubular, portable, and other types of steam
boilers and others, such as those for stoving, drying, boiling, and other purposes,
and has for its object that of increasing the heating surface of the flues or furnaces
and the evaporative power of the same, also to provide means to facilitate
expansion and contraction of the flues without the detrimental results experienced
hitherto with what are known as "bowling hoops" and flanged joints. It is well
known that owing to sharp corners or acute angles in "bowling hoops" and flanged
joints employed for jointing the flue rings of boilers that they frequently crack by
[1

page_text: the continual strain of expansion and contraction, and owing to the inefficiency of
the latter they groove the boiler ends and crack the angle irons.
Our invention is designed to entirely dispense with these defects which we effect
by employing at each joint or otherwise an annular or U shaped ring, with equal or
unequal sides, to which the flanged ends of the flue rings are rivetted. This form
of expansion ring allows of boiler flues being constructed so that the rivets are
outside or otherwise, and free from the action of fire or flame. This improved
annular expansion hoop can be constructed with an even or uneven or corrugated
outer surface to facilitate expansion aud contraction. The said hoops can be of any
desired depth and project beyond the surface line, or inner circle of the flue rings
to increase the heating or impinging, surface of the flue, by which the evaporative
power of the boiler will be considerably increased. This invention will dispense
with the collection of soot and other deposits in the flues as is the case with
bowling hoops."
Fig. 1 is a part sectional longitudinal clevation of a boiler showing one modi-
fication of our improved expansion ring for boiler flues.
Fig. 2 is an enlarged sectional elevation of same showing it connected to the flue
rings.
Fig. 3 is a part sectional longitudinal elevation of a boiler showing another modi-
fication of our improved expansion ring for boiler flues, and
Fig. 4 is an enlarged sectional elevation of same showing it connected to the
flue ringe.
A in the boiler shell; B the boiler front, and the internal boiler flues. The
fines C are composed of separate rings with flanged ends, between which we dispose
the annular or U shaped rings D, with equal sides, to which the flanged ends of the
fluerings C are secured by the rivets E; the latter being outside the flues and free
from the action of fire or flame. The annular or U shaped rings D are of such a
width as to allow of the same being rivetted to the flue rings and of sufficient
depth so as to project beyond the surface line or inner circle of the flue rings C to
increase the heating or impinging surface of the flue, by which the evaporative
power of the boiler will be considerably increased.
The annular or U shaped ring may be made with unequal sides, wherein oue end
of the flue ring C is flanged and the other left straight as shown in Figs. 3 and 4.
In this arrangement the rivets E of the flanged end of the fluc rings Care outside
the flues and free from the action of fire and flame. The bent or unequal end of
the annular ring D is rivetted to the straight end of the flue ring C by the rivets S.
In the latter case the heads of the rivets S are inside the flues Cand behind the
internal projecting portion of the annular ring D, which position protects them
against the action of fire and flame. Owing to the annular rings D being inverted
or concaved they are filled with water or liquid contained in the boiler, consequently
a greater volume is subjected or presented to the surface of the flues heated by the
fire or flame passing through the same.
-
The construction or contour of the annular shaped rings D are of such a large
sweep that they will readily expand and contract according to the requirements of
the boiler shell and flues without affecting the rivetted joints, thereby dispensing
with the detrimental results experienced hitherto with what are known as " bowling
hoops" and flanged joints.
Having now particularly described and ascertained the nature of our said invention
and in what manner the same is to be performed, we declare that what we claim is :-
In combination with the flues of steam and other boilers the use of the annular
or Ushaped rings D, with equal or unequal sides, for the purpose specified, sub-
stantially as described.
EDMUND CHADWICK,
A cont