Tube or Stay Fastenings for Steam Boilers or other Pressure Receivers
Year: 1897

page_text: Date of Application, 17th Apr.,. 1897
Complete Specification Left, 21st July, 1897-Accepted, 16th Apr.,
1898
PROVISIONAL SPECIFICATION.
Tube or Stay Fastenings for Steam Boilers or other Pressure Receivers:
CHARLES DOWSEN, 21, Croft Terrace, Jarrow-on-Tyne, County of Durham,
Mechanical Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention consists of tapping the holes in the boiler or receiver shell in
such a manner as to leave the end of the hole with a thread of diminishing diameter
for a suitable portion of its length, and of screwing the tube or stay with a thread
of the same pitch. An annular plug is made, the hole through which is tapped to
fit the tube or stay, and screwed on the outside to fit the hole in shell, the end
of the plug is divided across by one or more fine saw cuts for a portion of its
length, the plug is screwed onto the tube end, and returned into the hole in shell
and screwed down until the divided end is forced into the diminishing part of the
hole and so closing the end of the plug tightly onto the tube, and into the hole in
shell.
11
1
11007
I, CHARLES DOWSEN, of 21, Croft Terrace, Jarrow-on-Tyne, Mechanical Engineer,
do hereby declare the nature of this invention and in what manner the same is
to be performed, to be particularly described and ascertained in and by the follow-
ing statement:—
This invention is illustrated in the accompanying drawings, whereof Fig. 1
shows a section of part of a boiler or receiver shell part of a tube to be fixed
therein and an annular fixing plug,
Fig. 2 shows the annular plug in side elevation and
Fig. 3 shows it in end view.
i tap the holes in the boiler or receiver shell a in such a manner as to leave the
end 6 of each hole with a thread of diminishing diameter for a suitable portion
ef its length and screw the tube c or stay with a thread of the same pitch. An
annular plug d is made the hole through which is tapped to fit the tube c or stay
and the plug is screwed on the outside to fit the hole in shell a. The end of the
plug is divided across by one or more fine saw cuts e (three are shown) for
a portion of its length. The plug is screwed on to the tube end and returned into
the hole in shell and screwed down until the divided end is forced into the
D
017

page_text: diminishing part 6 of the hole so closing the end of the plug tightly on to the
tube and into the hole in shell.
;
Having now particularly described and ascertained the nature of the said in-
vention and in what manner the same is to be performed I declare that what I
claim is:-
Fastening a tube or stay in a steam boiler or other pressure receiver by means
of an annular plug that is (a) tapped internally to fit the externally screwed part
of the tube or stay, (b) screwed externally to fit a tapped hole in the boiler or
receiver shell made for a part of its length of diminishing diameter towards one
of its ends, and (c) divided across by one or more fine saw cuts for a portion of
its length, the said plug being screwed on to the tube end and afterwards into the
hole in the shell and screwed down until the divided end is forced into the diminish-
ing part of the hole so as to close the end of the plug tightly on to the tube
and into the hole in the shell.
Dated this 20th day of July 1897.
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.

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