Improvements in or relating to Boiler Tubes
Year: 1895

page_text: Date of Application, 30th Apr, 1895
Complete Specification Left 30th Jan 1896-Accepted, 14th Mar, 1896
PROVISIONAL SPECIFICATION
Improvements in or relating to Boiler Tubes
I, WIIIIAM SMITH of 160 High Street, Borough, SE Manufacturer, do
hereby declare the nature of the invention to be as follows
This invention relates to an improved means for securing tubes in boilers, and
similai vessels, and has for its object to provide an arrangement which will
effectually prevent the tubes from blowing out of the tube plate
This
In carrying out my invention, the ends of the tubes instead of being secured
directly in the boiler plate are provided with a ferrule screw ed internally and
externally The end of the boilei tube is screwed to receive this ferrule, and the
boiler plate is tapped so that the ferrule inly be screwed into the hole
ferrule is preferably made of mild steel, but any other metal suitable for the
purpose may be employed Both the external and internal threads upon the
ferrule and tube are of the same pitch The root of the thread on the inside of
the feri ule should be opposite the apex of the outside thread to permit of the parts
being screwed into the proper position lo screw this feule into position, it
projects for a short distance from the face of the tube plate, and may be formed
with perforations placed diametrically opposite each other or notches in a similar
The ferrule may also be formed
manner permitting an instrument to be applied
with a hexagonal or nut head This head completes the joint between the tube
plate and ferrule, and if desired the head may be also formed with an internal
flange bearing upon the end of the tube, completing the joint between the tube and
feri ule I he joint may also be formed by rolling the tube into the ferrule, and the
feri ule into the tube plate with a roller drift
GEO
RAYNER,
37, Chancery Lane, London, Agent for the Applicant
GEO
RAYNER,
37, Chancery Lane, London, Agent for the Applicant
COMPLETE SPECIFICATION
Improvements in or relating to Boiler Tubes
I, WILLIAM SMITH of 160, H₁h Street Borough, London, S E Manufacturer,
do hereby declare the nature of this nivention and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement
-
This invention elites to an improved means for securing tubes in boilers, and
similar cssel, and has for its object to provide an aitangement which will
effectually prevent the tubes from blowing out of the tube plate
In carrying out my invention, the ends of the tubes, instead of being secured
directly in the boilci plate, are provided with ferrule sciewed externally and
internally 1he end of the tube is screwed to receive this ferrule, and the boiler
The said
plate tule hole is tapped so that the fenule may be screwed therein
ferrule is preferably made of mild steel, but iny other metal suitable for the purpose
may be employed Both the external and internal threads upon the ferrule and
tube are of the same pitch The root of the thread on the inside of the ferrule
should be opposite the apex of the outside thread to permit of the parts being

page_text: screwed into the proper position The ferrule when in position projects a short
distance from the outer face of the tube plate and this projecting part is formed
with perforations or notches placed diametrically opposite each other for the
purpose of applying an instrument for screwing up or unscrewing the said ferrule
which is prefciably slightly tapcied to facilitate the screwing action The ferrule
may be formed with a hexagonal or nut bead which completes the joint between
the tube plate and ferrule, and if desired the head may be also formed with an
internal flange bearing upon the end of the tube, thus completing the joint between
the tube and ferrule The joint may also be formed by rolling the tube into the
ferrule and the ferrule into the tube plate with a roller drift
And in order to clearly understand my invention I will describe the same with
reference to the accompanying sheet of drawings, in which
Fig 1 represents a section of a portion of a boiler plate and tube fixing ferrule
with the tube screwed therein, and
Fig 2 is an end view of the tube and ferrule
Fig 3 is side view of the feriale,
Fig 4 a section of the tube plate shewing the tapped hole for receiving the
feule, and
Fig 5 is in clevation of the sciew ended tube
a represents the boiler tube plate which is tapped to form the scrow thread, with
a slight taper for receiving the screwed ferrule is shown in F1 4 The tube 6 1s
fixed to the plate a by the ferrule which is formed with t mole thiend also
tapered to fit the screwed hole d in the plate a I he ferrule is also formed with a
female thread for receiving the male thread e formed on the end of the tube b
The ferrule is screwed into the plate by means of an instrument constructed so as
to take into perforations or notches c¹ formed in the outer end of the sud ferrule,
which end projects a short distance beyond the outer fice of the plate a, as shown
at c², when the ferrule is screwed into position in the said plate
Ihe end c may
be formed with hexagonal head or nut for completing the joint between the tube
plate and ferrule and may also be provided with an internal flange beaung against
the end of the tube, or I may screw collar or nut upon the said end and
against the plite a as shown in Fig 1
My invention may alo be applied to the fixing of spokes to wheel felloes by
forming thiend on the spoke and securing it to the felloes by the screwed ferrule
And may also apply it to fixing stays in bridge or girder work
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is,
(1) In means for fixing tubes in boiler tube plate, the employment of a ferrule
formed with a mile and female sew thread, substantially as described and for
the purposes specified
(2) In fixing tubes to boiler plates the employment of a feule formed with a
male thread for screwing into a tapped hole in the boiler plate, and with female
thread for 1ceiving the screwed end of the said tube, substantially as described
and for the purposes specified
(3) In fixing tubes to boiler plates the employment of a male and female screwed
ferrule fourred with perforations or notches for screwing up or unscrewing the
said feul and with oi thout hexagonal head o t nut substantially as
described and for the purposes specified
(4) The improved means for fixing tubes to boiler plates, substantially as
described and shown in the drawing>
Dated this 30th day of January 1896
GEO H RAINER,
37, Chancery Lane, London, Agent for the Applicant