IMPROVED MEANS OF SETTING OR SECURING BOILER TUBES IN THEIR TUBE PLATES
Year: 1877

page_text: LETTERS PATENT to Alexander Melville Clark, of 53, Chancery Lane, in the
County of Middlesex, Patent Agent, for the Invention of "IMPROVED MEANS
OF SETTING OR SECURING BOILER TUBES IN THEIR TUBE PLATES" A com-
munication fiom abiond by the Patent Tube Setting Company of Salamanca,
Cattaraugus County, State of New York, United States of America
Sealed the 22nd June 1877, and dated the 24th January 1877.
PROVISIONAL SPECIFICATION left by the said Alexander Melville Clark at
the Office of the Commissioners of Patents on the 24th January 1877
ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the County of Middle-
sex, Patent Agent "IMPROVED MEANS OF SETTING OR SECURING BOILER TUBES
IN THEIR TUBE PLATES" A communication fiom abroad by the Patent Tube Setting
Company of Salamanca, Cattaraugus County, State of New York, United States of
America
This Invention consists in protecting and securing the ends of the tubes of steam
boilers by means of a flange formed on the outer edge of the openings in the tube
sheet, and bent inward against the ends of the tubes, which project or flare outward
into the grooves formed behind the flange, as herein-after described
The ordinary mode of setting or securing tubes of steam boilers in their tube
sheets is by riveting or upsetting the ends of the tubes.
Another method, which has been suggested, consists in flaring the ends of the
tubes outward into a circular groove, and screwing an annulai nut up against the
ends of the tubes thus flared.
The first of these modes is objectionable on account of the liability of leakage
occurring in consequence of expansion and contraction of the parts, and the second
mode on account of the expense of forming the screw thread for the nut, and the
construction of the nut itself, which must be frequently renewed
According to this Invention holes are bored in the usual way in the tube sheet

page_text: to receive the ends of the tubes, but said holes are of the same diameter as the
tubes on the inner side only of the tube sheet, the holes being enlarged in the
middle by a groove, and contincted on the face side of the sheet by a flange
When a tube is inserted in a hole its end abuts against the inner side of the flange,
and it is flared or bent outward into the groove, and the flange turned down over
it on the inside By this mode of setting tubes their ends are protected from injury
by flame or heat, and leakage is not liable to occur from the expansion and contraction
to which such parts are constantly subjected
Any suitable means may be employed to flare the tube or turn down the
flange
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Alexander Melville Clark in the Great Seal Patent Office on the
17th July 1877
ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the County of Middle-
sex, Patent Agent "IMPROVED MEANS OF SETTING OR SECURING BOILER TUBES
IN THEIR TUBE PLATES" A communication fiom abroad by the Patent Tube Setting
Company of Salamanca, Cattaraugus County, State of New York, United States of
America
This Invention consists in projecting and securing the ends of the tubes of steam
boilers by means of a flange formed on the outer edge of the openings in the tube
plate, and bent inward against the ends of the tubes, which project on flaro outward
into the grooves formed behind the flange, as hier ein-after described
The ordinary mode of setting or securing tubes of steam boilers in their tube
plates is by riveting or upsetting the ends of the tubes.
Another method, which has been suggested, consists in flaring the ends of the
tubes outward into a circular groove, and screwing an annular nut up against the
ends of the tubes thus flared
The first of these modes is objectionable, on account of the hability of leakage
occulling in consequence of expansion and contraction of the parts, the second
mode on account of the expense of forming the screw thread for the nut, and the
construction of the nut itself, which must be frequently renewed.
In the Diawing Figure 1 is a cross section of a fiagment of the tubo plate, and
Figures 2 and 3 are sections of the tube plate and a tube, showing the mode of
connection
In carrying out this Invention holes B, Figure 1, are bored in the usual way in
the tube plate A to receive the ends of the tubes D, but said holes are of the same
diameter as the tubes on the inner side only of the tube plates, the holes being
enlarged in the middle by a groove C, and contracted on the face side of plate A by
a flange F, as shown When a tube D is inserted in a hole B its end abuts against
the inner side of the flange F, as shown in Figure 2, and when flared or bent out-
ward into groove C, and the flange F turned down over it on the inside, the parts
appear as in Figure 3 By this mode of setting tubes their ends are protected from
injury by flame or heat, and leakage is not liable to occur from the expansion and
contraction to which such parts are constantly subjectod
Any suitable means may be employed to flare the tube, o turn down the
flange
Having described the nature of the said Invention, and the manner of performing
the same, I wish it understood that I do not claim a flange projecting inward and
abutting the flared end of the tube, as shown in Figure 2, but what I do claim
as the Invention to be protected by the herein-before in part recited Letters Patent

page_text: 18, the combination with the tube of the flange F turned inward or calked over the
flared end theroof, as set forth, for the purpose specified.
In witness whereof, I, the said Alexander Melville Clark, have hereunto set
my hand and seal, this Seventeenth day of July, in the year of our Lord One
thousand eight hundred and seventy-seven
A 15 AT ADTZ
A. MOL
M CLARK (s)