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Патент USA US2112953

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April 5, 1938.
Q_ _1_ CHRlSTENSQN
LOCOMOTIVE FIREBOX
' ' Filed June 1s.
195e '
. 2,112,953
Patented Apr. 5, 1938
2,112,953
UNITED STATES PATENT OFFICE
2,112,953
LoooMo-'rlvE FmEBoX
Gust J. Christenson, Chicago, Ill., assignor to
Locomotive Firebox Company, Chicago, Ill., a
corporation of Delaware
Application June 13, 1936, Serial No. 85,063
3 Claims. (Cl. 122-68)
This invention relates to improvements in lo
to form the side water legs lll, back water leg
comotive type iireboxes and it consists of the
matters hereinafter described and more particu
larly pointed out in the appended claims.
One of the objects of the present invention
5
is to provide a locomotive type ñrebox with a
novel tube arrangement for increasing the heat
ing surface of the ñrebox and for accelerating
the water circulating action by syphoning water
10 irom points along the side water legs and dis
charging the same upon the top of the crown
sheet to insure a constant flooding of the same.
Another object of the invention is to provide a
circulating tube arrangement for a firebox of this
15 kind wherein the use of longer tubes is possible
not only to give a greater heating surface area,
but also to make them more ñexible so that they
will accommodate, without cracking, the relative
movement of certain of the ñrebox sheets under
20
temperature changes.
A further object of the invention is to provide
cept to say that companion sheets are suitably
staybolted.
To increase the effective evaporating surface
area of the rlrebox and the steaming and water
circulating efhciency of the associated boiler, I 10y
provide the following arrangement:_
On each side of the longitudinal median line
of the ñrebox are located sets of water evapo
rating and circulating tubes I8_I8 with the
tubes in each set arranged in spaced relation,
longitudinally of the firebox. Preferably the
tubes in one set are disposed in the transverse
planes of those in the other set.
Each tube includes an inlet portion i9, an
outlet portion 20 and an intermediate connecting
portion 2l of a reverse curve formation on the
order of an ogee. The inlet portion I9 has an
arrangement providing a better support for the
brick of the arch and whereby a lesser number of
brick patterns is required and wherein the brick
may be so arranged as to produce a tighter arch.
extremity 22 arranged at a right angle to the
plane of the associated side sheet 5. This eX
tremity opens through and is ñxed in said side
sheet and merges into the inlet portion by a
short curved portion 23.
The inlet portion I9
as well as others, together with the advantages
thereof will more fully appear as the specification
which as shown herein is relatively straight, eX
proceeds.
portion 23 at an inclination desired in the asso- u
In the drawing:
Fig. 1 is a longitudinal vertical sectional View
through a locomotive iirebox and adjacent boiler
parts, embodying the preferred form ofthe in
35 vention, the plane of the section being taken on
tends upwardly and inwardly from thecurved
ciated part of a fire arch which will be referred
to later.
The crown sheet 6 is arched or curved
transversely of the flrebox and the outlet por
tion 2l) of the tube extends radially with respect
thereto and opens through and is fixed therein
the line !_| of Fig. 2;
in any suitable manner.
Fig. 2 is a transverse vertical sectional view
through the same as taken on the line 2_2 of
As herein shown, the intermediate portion 2|
of the tube comprises upper and lower reversed
curved parts and the lower curved parts of the
tubes in both sets are spaced relatively close.
together as best appears in Fig. 2.
It is apparent that with the tubes anchored
in the crown sheet and side sheets as mentioned,
forces are transmitted through said tubes from
the crown sheet _to the side sheets. Due to the 45
Fig. l; and
40 ' Fig. 3 is a detail horizontal sectional View on a
somewhat enlarged scale as taken on the line
3_3 of Fig. 2.
Referring now in detail to that embodiment of
the invention, illustrated in the accompanying
' drawing, 5_5 indicates the side sheets of the
firebox, 6 indicates the crown sheet, 'l indicates
the front or iiue sheet and 8 indicates the back
sheet thereof. It will be understood that the
i'irebox is positioned in the rear end of the asso
50 ciated boiler shell, which includes the outer side
sheets 9_5?, top sheet l0, back sheet l I and front
throat sheet l2. Portions of the back sheets 8
and Il respectively, are formed to provide a fuel
55
ventional locomotive boiler rear end structure
and requires no further detailed description eX
in a locomotive type of ñrebox, a circulator tube
The above mentioned objects of the invention,
30
l5 and front throat I6 respectively, all bottomed
by a mud ring Il, The above is typical of a con
door opening I3.
Several of the various sheets mentioned coact
reverse curve or bulging formation of the inter
mediate portions 2! of the tubes, these portions
ñeX to accommodate such relative movement be
tween the sheets without cracking.
While the spacing between the lower curved
parts of the intermediate portions of the tubes
is relatively close, it is so gauged as to never
permit actual contact between said parts.
The structure admirably coacts to support an
arch indicated> as a whole as at 24 in Fig. 2. 55
2,112,953
This arch is made up of transverse rows of brick,
each including an outer end brick 25, an inner
end brick 26 and intermediate brick 2l'. The
bricks are preferably curved transversely to the
plane of the row in which they are positioned, as
appears in Fig. 1. Each brick has concaved
corners 28 to rest upon upper parts of the tubes.
The outer end brick abut against the associated
side sheet 5 and the inner` end face of the inner
10 end brick of the row is bevelled off to provide a
full face contact with the like face of the inner
end brick of the opposed row of brick. Each
inner end brick is cutaway as at 29 to reduce its
width to permit it to pass the curved intermediate
15 parts of the tubes, as best appears in Fig. 3.
In the front end row of bricks, the bricks there
oi rest at one side upon the frontmost tubes and
at th-e other side engage upon lugs 30 on the flue
sheet 'I below the lowermost ñre tube or flue
20 therein.
In the outer side sheets 9_9, in line with the
inlet end extremities 22 of the tubes are wash-out
plugs 3| and in the top sheet ID of the boiler
shell, in line with the outlet ends 20 of the tubes,
i are wash-out plugs 32.
In the operation of the boiler, of which the ñre
box forms a part, the tubes absorb heat units
~from the products of combustion. Due to the
thermic heads thus produced, water and steam
30 are discharged through the outlet ends into the
boiler water space above the crown sheet, and
water is drawn into the tubes from the side water
legs I4, at longitudinally spaced points therein.
Thus a continuous circulatory action is estab
35 lished, the inñuence of which is exerted in all
directions in the side water legs so as to produce
a turbulence therein which prevents settling out
oi the solids in the water at the bottom of the
side water legs. Also, due to the gushing or dis
charge of water from the outlet -end of the tubes,
` a constant flooding of the crown sheet is effected
that insures its complete submergence. Thus
even though the water level in the boiler falls
45,
below normal, it is assured that the same will at
all times be covered with water.
Again, due to the increased circulation'of water
through the side water legs, the stresses normally
imposed on the side sheets of the i'lrebox are
equalized and this of course increases the life of
50 said sheets.
The tubes which are preferably made of seam
less rnetal, may be readily bent to shape without
cracking and may be easily installed in place.
While in describing the invention, I have re
55 ferred in detail to the form, arrangement and
construction of the parts thereof, the same is to
be considered only in the illustrative sense so
that I do not wish to be limited thereto except as
may be specifically set forth in the appended
claims.
I claim as my invention:
1. A locomotive ñrebox embodying therein a
crown sheet and side sheets, a set of circulator
tubes arranged on each side of the longitudinal
median line of the crown sheet, each tube includ
ing an inlet end portion opening through an as
sociated side sheet, an outlet end portion opening
through the crown sheet and an intermediate
portion of reverse curvature connecting said inlet
and outlet end portions, the intermediate portions
of the tubes in one set substantially abutting the
like portions of the tubes in the other set near the
longitudinal median line of the ñrebox, and arch
brick supported on the inlet end portions of the
tubes in both sets and meeting on said line.
2. A locomotive ñrebox embodying therein'a
crown sheet and side sheets, a set of circulator
tubes arranged on each side of the longitudinal
median line of the crown sheet, each tube includ
ing an inlet end portion opening through an as
sociated side sheet, an outlet end portion opening
through the crown sheet and an intermediate por
tion of reverse curvature connecting said inl-et
and outlet end portions, the intermediate por
tions of the tubes in one se-t being disposed in
substantially close relation to the intermediate
portions of the tubes in the other set near the
longitudinal median line of the firebox, and arch
brick supported on said inlet end portions and
parts of said intermediate portions of the tubes
of both sets and meeting in the longitudinal
median line of the ñrebox to form a closed arch.
3, A locomotive iirebox embodying therein a
crown sheet and side sheets, a set of circulator
tubes arranged on each side of the longitudinal
median line of the crown sheet, each tube includ
ing an inlet end portion opening through an as
sociated side sheet, an outlet end portion open
ing through the crown sheet and an intermediate
portion of reverse curvature connecting said inlet
and outlet end portions, the intermediate portion
of the tubes in one set being disposed in sub
stantially close relation to the intermediate por
tion oi the tubes in the other set near the longi
tudinal median line of the ñrebox, the tubes in
each set being successively longer as they ap
proach the front of the ñrebox and the inlet ends
of the tubes in each set opening through the
associated side sheet at successively lower points
toward the front end of the firebox, and arch
brick supported on said inlet end portions and
parts of said intermediate portions of the tubes
of both sets.
GUST J. CHRISTENSON.
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