IMPROVEMENTS IN AND CONNECTED WITH TRANSVERSE WATER TUBES FOR STEAM BOILERS
Year: 1884

page_text: I, EDWARD JOSEPH CURTIN of the City and County of Bristol, Managing
Engineer do hereby declare the nature of my said invention for "IMPROVEMENTS IN
AND CONNECTED WITH TRANSVERSE WATER TUBES FOR STEAM BOILERS" to be as
follows:-
My Invention relates to that description of steam boilers in which water tubes
are employed for connecting one water space of the boiler with another. In such
boilers, more particularly those where conical tubes are employed, these have here-
tofore been constructed with flanges at the ends which have been rivetted to the
flue of the boiler.
According to my present invention I construct such tubes without flanges, and
I provide the larger ends thereof with a collar coned in the contrary direction to
the taper of the tubes, so that when the tube is fitted in the holes of the flue with
or without caulking, the pressure of the steam on the outside of the latter will
tend to tighten both ends of the tube in the flue, the holes of which may if desired
be formed with flanges round them to fit the taper ends. The smaller end of the
tube may also be provided with a collar of greater conicity than the tube itself and
the conical collars may be brazed or screwed or otherwise fastened to the ends of
the tubes or inay be formed on the tubes themselves.
The tube may be further secured in the flue by fixing to its ends screwed stems
passing through bridge pieces fixed to the flue and secured by screw nuts.
The above described conical tubes may be either plain or formed with longi-
tudinal, circular or helical corrugations and the parts of the tube between the two
ends may also be made with parallel sides, or the tubes may be plain, cylindrical
tubes instead of conical with the ends formed in either of the ways described.
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C.

page_text: COMPLETE SPECIFICATION.
I, EDWARD JOSEPH CURTIN of the City and County of Bristol, Managing
Engineer do hereby declare the nature of my said invention for "IMPROVEMENTS
IN AND CONNECTED WITH TRANSVERSE WATER TUBES FOR STEAM BOILERS" and in
-what-manner the same is to be performed to be particularly described and
ascertained-in-and-by the following statement :—
My invention relates to that description of steam boilers in which water tubes
are employed for connecting one water space of the boiler with another. In such
boilers, more particularly those where conical tubes are employed, these have here-
-toforo been constructed with. flanges at the ends which have been rivitted to the
flue of the boiler.
According to my presont invention I construct such tubes without flanges, and
I provide the larger ends thereof with a collar coned in the contrary direction to
the
taper of-the-tube-so-that-when-the tube is fitted in the holes of the flue with
or without caulking, the pressure of the steam on the outside of the latter-will-
tend to tighten both ends of the tube in the flue the holes of which may if desired
be formed with flanges round them to fit the taper ends. The smaller end of the
tube may also be provided with a collar of greater conicity than the tube itself and
the conical collars may be brazed or screwed or otherwise fastened to the ends of
the tubes or may be formed on the tubes themselves.
The tube may be further secured in the flue by fixing to its ends screwed stems
passing through bridge pieces fixed to the flue and secured by screw nuts,
The above described conical tubes may be either plain or formed with longi-
tudinal, circular or helical corrugations and the parts of the tube between the two
ends may also be made with parallel sides, or the tubes may be plain, cylindrical
tubes instead of conical with the ends formed in either of the ways described.
Fig 1 of the accompanying drawings shews the above described construction of
conical water tubes with the larger end provided with a collar A coned in the
contrary direction to the taper of the tube, so that the pressure of the steam upon
the flue B will tend to tighten this upon the collar of the tube, while at the lower
end the flue will tighten upon the tube itself; or the latter may be provided with
a collar having greater conicity than the tube. Fig. 2 shews a similar construction
to Fig. 1, the joints being further secured by means of screwed stems C attached to
cross pieces in the tubes, and passing through bridge pieces D bearing upon the flue,
the ends of the tubes being drawn in tight by means of nuts E.
In the arrangement shewn to an enlarged scale at Fig. 3 the coned collar A is
screwed upon the end of the tube, which may be either conical or with parallel
sides, and the outer taper surface of the collar may also be formed with a screw
thread, so as to screw into the flange B formed on the boiler tube. Or the collar
may simply fit with a plain surface into the hole of the flue, with or without
caulking, as at Fig 1,
1

page_text: 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
1. Constructing water tubes for steam boilers with collars at their ends coned in
such manner that when fitted in the holes of the boiler flue, the pressure of tho
steam will tighten the flue upon the tube, substantially as herein doscribed.
2. Constructing conical water tubes for steam boilers with a collar at the larger
end operating as set forth in the precceding claim, while the smaller end is con-
structed without such collar, substantially as herein described with reference to
Fig. 1 of the drawings.
3. In combination with water tubes such as are referred to in the preceeding
claims the use of screwed stems with nuts attached to the tubes and bridge pieces
attached to the boiler flue, operating as herein described with reference to Fig 2 of
the drawings.
4. Constructing water tubes for steam boilers with coned collars screwed thereon,
substantially as herein described with reference to Fig. 3 of the drawings.
Dated this 9th day of February 1885.
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C.