Improvements in and relating to Water-tube Steam Boilers or Generators.
Year: 1899

page_text: Date of Application, 5th Dec., 1899-Accepted, 27th Jan,,
1900
COMPLETE SPECIFICATION,
Improvements in and relating to Water-tube Steam Boilers or
Generators.
I, EMMETT MCCONVILLE, of Imperial Power Building, in the City of Pitts-
burgh, County of Allegheny, and State of Pennsylvania, United States of America,
Manufacturer, do hereby declare the object 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:-
The object of the present invention is to construct a simple, efficient and econo-
mical steam boiler or generator, whereby steam can be generated in quantities
much more rapidly than has heretofore been accomplished in boilers of a some-
what similar type.
A further object of my invention is to employ vertical water and steam boxes
opposing the other, and held or tied together by suitable jointed tubes and at
the same time utilize said tubes or pipes which tie together and brace the
vertical steam boxes, as passages for intercommunication, for circulating steam
at the upper extremities of the boxes in conjunction with a steam drum, and at
their lower extremities for feed water circulation.
My invention further consists in providing a number of continuous tubes or
water coils having their extreme ends attached to vertical water and steam
boxes or generators, one end connecting to the lowermost feed water extremity,
the other end at the extreme end of the box for allowing the generated steam in
said coils to enter the aforesaid boxes through the tubes that tie the boxes
together, and thence into the steam drum.
My invention further consists in having the feed water enter the vertical boxes
at four points simultaneously through the medium of a pipe traversing the
steam and water coils and connecting centrally at right angles to the two lower-
most tubes which brace and hold the vertical boxes together.
My invention further consists in securing the water coils near their free ends
and contiguous to the bushings by means of braces secured to the vertical boxes
in alignment with the coils, and in conjunction with collars shrunk on said coils
for preventing the braces from leaving their position through any strain or shock
that may come upon the coils.
DESCRIPTION OF THE DRAWING
Figure 1 is a front elevation of my improved steam generator partly in section
as indicated by line 2 Figure 1. Fig. 2 is a side elevation of the same with a
portion of one box broken away and the pipes or coils in section. Fig. 3 is a
plan view of my improved steam generator. Fig. 4 is a side elevation of a single
coil, illustrating the means for securing the coils to the water and steam boxes,
this box being shown in vertical section. Fig. 5 is a side elevation, partly in
section, illustrating the means (on an exaggerated scale) for securing and brac-
ing the ends of the water and steam coils. Fig. 6 is a detail view of one of
the screw bushings with a portion of the end of a steam coil therein, and its

page_text: accompanying copper washer contiguous thereto. Fig. 7 is a detail in section,
of a portion of a steam or water coil, illustrating the turned up or flanged end
for securing said coils to the boxes in conjunction with the bushings and washers.
My invention consists of boxes A, which are provided with coverings A¹, and
tied together by sections of tubing B and B', and tee couplings 1.
Secured to the outside and immediately opposite each other on said boxes are
trunnions al for swinging the entire steam generator or boiler on suitable sup-
ports of a carriage or other vehicle.
Secured to the tees 61 on tubing B¹ is a feed water pipe C. The water is fed
in the boxes at c, and as the feed water traverses said pipe C it enters the two
lower sections of tubing B1, thus feeding water into the water boxes at four
distinct points simultaneously, by this means giving a free distribution of feed
water.
The generator or boiler is provided with a steam drum D, and is supported by
steam pipes b, e and E, see Figs. 1 and 2; the steam pipes just referred to supply
steam to said drum D through the medium of the sectional tubes B and boxes A.
Extending from the aforesaid steam drum D is a steam feed pipe F, for supply-
ing the engine with steam.
The drum D is surmounted by a spring safety valve having a hood for
covering up the parts, and an opening for allowing overcharged steam to
escape.
The water and steam boxes are reinforced by two strips of metal or stock a²,
see Figs. 1, 2, 4 and 5. so as to allow sufficient metal for screw-threading the
numerous holes bored therein for the reception of screw-threaded bushings g
with their accompanying copper washers H.
The holes referred to are drilled the size of the bore of the coil of pipes G.
entirely through the boxes A, then I counterbore each hole and screw-thread-
the same, so as to form a seat or shoulder for the copper washer H, see Fig. 5,
which fully illustrates the device on an exaggerated scale.
Secured to the bushings g are the free ends of the steam coils G. The ends
of said steam coils are finished perfectly round and steam tight, and have their
ends turned up at right angles to the body of the pipe, as shown at g', Figs. 4
to 6, inclusive, thus forming a flange which is perfectly smooth and true for rest-
ing against the face of the bushing and also against the soft copper washer.
Each water or steam coil is secured to one box A, as by this means leaky
joints are obviated, as any leakage that might occur is confined to the four tie
tubes B and B, thus overcoming the inconvenience of many joints, such as used
in boilers or generators for the purpose this is designed.
י
Near the extreme free ends of the coils G are collars J, which are shrunk on
the ends of the pipe for receiving the thrust of braces I, the opposite end of
said braces is rivetted to the boxes A, as indicated at Figs. 4 and 5.
The object of these braces is to relieve the bushings of any undue strain
when assembling the coils. or from any violent agitation in the coils when the
steam is at first generating.
When assembling my improved generator, I secure all the coils in one box A,
and also in the opposite box A, I then slip one set of coils between its opposite
set. until sufficiently close to use the tie tubing B and B which are provided
with right and left hand screw threads. By this means my steam generator
becomes perfectly steam tight. Before coupling the boxes together I insert the
short pipes b into the drum D, and also in the tee couplings b. The pipes E
are also right and left hand screw-threaded for the purpose as previously indi-
cated.
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what I
claim is

page_text: coils for generating steam arranged in series, each alternate coil being secured
to its independent vertical box, and said boxes tied together by water and steam
circulating tubes.
2. In combination with two oppositely arranged water boxes having reinforc-
ing strips thereon, continuous water coils arranged so that each alternate coil
is secured to its independent box through the medium of screw bushings, and
flanges on the free ends of said coils contacting soft metal washers or gaskets,
as specified.
3. In combination with two water or steam boxes, continuous water or steam
coils arranged so that each alternate coil is secured to its independent water or
steam box through the medium of screw bushings, of braces supporting each coil
by means of adjacent collars and secured to the water or steam boxes as specified.
4. In a steam generator consisting of water and steam boxes tied together by
means of four ends of tubing, having a tee centrally located in each of the four
sets of tubing, and a feed water pipe connecting the two lower sets of tubing for
delivering water to said generators at four distinct and distant points, in com-
bination with water and steam coils secured individually to each water and
steam box, as specified.
5. In combination with two water boxes having reinforcing strips thereon
tied together by means of water and steam circulating tubing, water and steam
coils secured to said water boxes by bushings and braces, collars contacting said
braces, and one trunnion attached to each of the two water boxes for supporting
the same in a movable position, as shown and described.
21.3 13:441, der of December 1899.
JENSEN & SON,
77. Chancery Lane, London, W.C.,.Patent Agents.