Year: 1892

page_text: which can be taken off and put on as required, and is used for rocking the grate to
clean out the ashes and for upsetting the entire grate when the pin is withdrawn for
dumping out the coal and ashes into the ash pit below.
The fire pot A, Figs. 2, 3, 4, 5 and 6, consists of a hollow top ring a, and a
hollow bottom ring ; these are cast integral with the central or intervening part
or wall C, which consists of tubes B, of double tubular form as shown in Fig. 4.
Tubes of this form make a stronger fire pot and produce more heating surface than
if plain. The tubes B, are connected together by bridge pieces d. By making
these bridge pieces short, the heat received by them is nearly all absorbed by the
water in said tubes, the whole forming a complete casing which when in operation
is full of water and does not require a jacket to prevent escape of heat.
Another advantage obtained by constructing the central tubular portion or wall
of the fire pot double tubular and with bridge pieces is, that the fire pot is
remarkably exempt from liability to crack by the unequal expansion of the metal
caused by the fire acting unequally on its various parts.
e, Figs. 3 and 4, is the door way to the fire pot, and f, f, are inlet water pipes or
returns leading into the bottom ring b.
g, Fig. 2, is the outlet in a projection L, made integral with the ring a, of the
fire pot, through which outlet the water passes (after flowing through all the parts
of the tubular spaces and rings) into the upper part of the heater or boiler.
E, Figs. 7, 8, 9 and 10, are the water chambers or boiler sections, placed oue
above the other flatwise, the lower one on top of the fire pot C, and said sections
have flue perforations P, the perforation of one section intercepting the perforations
of the other section, whereby the products of combustion pass between the boiler
sections in a zig-zag course.
The sections E, when in use, contain the water to be heated and circulated, and
said sections may be of octagonal or other form, but circular is preferred. Each
section has at one portion of its circumference a thickened part with openings h, h,
Figs. 9 and 10, into the interior of the chamber, one for ingress and the other for
egress of water.
Each section or chamber E, is integrally cast, and is formed of
the upper or top, and lower or bottom plates, and the wall or circumferential rim,
to allow smoke to pass between the sections and perforations to allow smoke and
heat to pass through them in a zig-zag manner from the fire pot to the top of the
boiler. Alternate sections have six or more flue perforations P, Fig. 9, arranged near
the circumference, and the intermediate sections a central flue perforation P,
Fig. 10, equal in capacity to the six smaller flues.
Inside the sections or chambers E, is cast a diaphragm M, Figs. 8, 9 and 10,
which extends from the division between the ingress and egress water apertures to
some distance radially within the chamber, to cause the water to flow around the
end of the diaphragm to the utmost limits of the section in its passage from one
compartment of a water post hereinafter referred to to the egress aperture of the
other compartment of the water post. These diaphragms are made to suit the
internal form of each section, as shown in Figs. 9 and 10.
The circumferential wall of the water sections E, extends downward and
upwards, as shown in Figs. 7 and 8, the downward extension m terminating plain,
and the upward extension forming a narrow head n projecting sufficiently to admit
of the lower part of the next section seating within it, whereby the sections are
contained one within the rim of the other when the sections are placed one above
the other to complete the boiler. The space N, thus formed between the sections
is for the passage of heat and smoke, which first strikes the lowest section after
leaving the fire pot, and in said lowest section are six flucs P, through which the
products of combustion pass and distribute the heat over the lower surface of said
water chaniber or boiler section E. The smoke and heat then focus toward the
central flue of the next section upwardly, thence spreading again to the six upper
flues and again focusing to the central flue in the next upper section, and so on
through the combined sections until discharged through the outlet R, at the top of
the boiler, into the chimney.

page_text: At the division between the ingress and egress apertures where the diaphragm
begins or starts, is a pocket S, Figs. 7, 9 and 10, to receive a nut T, by which the
water post (hereafter referred to) is bolted to each section E.
The outlet g, Fig. 2, of the fire pot water space is in a diaphragm K, integral
therewith and covering more than one half of the projection L, and closing the
bottom of one compartment of the water post.
The water post V, Figs. 11, 12 and 13, is a hollow column made with a flange at
the bottom to bolt on top of the outlet of the fire pot, and said water post is
divided uprightly by a diaphragm D, and horizontally at the top by a shorter
diaphragm H. The diaphragm H, causes all the water which issues from the fire
pot when heated, to flow into the compartment F, of the water post, and thence
through the water space in the sections E, into the compartment G, of the water
post, and said compartment G, is closed at the bottom by the diaphragm on fire pot
at q Fig. 2, and the other compartment F, opens into the water space of the fire
pot. The top of the water post or column has one or more outlets, from which
issues the heated water into the circulating pipes forming the heating apparatus all
through the building to be heated.
14, 15, Figs. 9, 10 and 11, are apertures in the respective water compartments F
and G, for ingress and egress of water to and from the water sections E, of each
section, and these apertures when the water post is in position on the top of the
fire pot, coincide with the ingress and egress apertures h, in said sections E, and as
the water in circulation enters the water post from the fire pot at 16, Fig. 11, it
ascends inside the compartment until it reaches the aperture of ingress into the
respective sections E, whence it flows within the circumference of the sections until
it finds its outlet at the aperture of egress 15, into the compartment of the water
post from whence it flows up to the openings or outlets at the top of the post and
into the circulating pipes forming the system of heating.
The water in the fire pot as it becomes heated circulates into the compartment F,
of the water post, and from said compartment F, into the several sections of the
boiler, and from these sections by a circuitous route into the other compartment of
the water post, and then into the pipes throughout the building to be heated.
In line with the apertures of ingress and egress in the water post, are bolt
holes 17, entirely through the water post where the diaphragm divides it into two
compartments. These bolt holes are in the thickness of metal forming the
diaphragm, consequently the bolts 20, going into the holes do not come in contact
with the water, and are preserved from rust. The bolts hold the boiler sections to
the water post by the nuts and pockets, when the sections are placed in position
above the fire pot.
Another valuable feature in this boiler is that the joints where the several parts
of the boiler are connected, are entirely apart from the fire, and can never be
heated to a greater degree than the water contained in the boiler, and therefore are
not liable to be burned out or destroyed by heat.
Although the boiler as above described is shown as circular, yet the same
principles of construction may be adopted for any other form of boiler or heater,
therefore the invention is not limited to the precise form or shape of the base, the
fire pot, or the sections, or water chambers, or the water post.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The fire pot having upper and lower hollow rings connected by tubes and the tubes
connected by bridge pieces, said fire pot provided with a fire hole or door way, and
outlets and inlets, substantially as described and shown in Figures 2, 3, 4, 5, and 6,
of the drawings.
2. The water post V, having diaphragms D and H, and openings 14, 15 and bolt
holes 17, as shown in Figures 11 and 12 of the drawings.
3. The combination of the base 2, the fire pot C, the sections E, the water

page_text: post V, having diaphragms D, H, and apertures 14, 15, provided with bolt holes 17,
the whole forming a sectional hot water boiler substantially as described and shown
in the drawings.
ALLISON BROS.,
Agents for the Applicant.