An Improvement in Fastening Boiler or other Tubes into Tube- plates, whereby they are kept Tight by the Action of the Steam or other Pressure.
Year: 1893

page_text: Date of Application, 6th Jan., 1893
Complete Specification Left, 1st Feb., 1893-Accepted, 11th Mar., 1893
PROVISIONAL SPECIFICATION.
An Improvement in Fastening Boiler or other Tubes into Tube-
plates, whereby they are kept Tight by the Action of the Steam
or other Pressure.
I, GEORGE WILSON of Thirteen Victoria Street in the City of Westminster
Civil Engineer do hereby declare the nature of this invention to be as follows:-
My invention consists in recessing for a considerable portion of its depth, the
hole in the tubeplate on the pressure side, which recess may be parallel or slightly
taper to the length of the tube, and inserting into this recess, and encircling the
tube, a U-shaped ferrule, which ferrule may be of metal and loose upon the tube,
or preferably formed out of the tube-end itself.
By this means I obtain a circular flexibility of the tube-end in the tube-hole and
also an end bearing surface of sufficient width to cover any distortion of the tube-
hole by unequal expansion or other causes. I also obtain the internal steam or
other pressure to force and expand the U-shaped ferrule, or tube-end, into the
tube-hole and recess.
When the U-shaped ferrule is formed out of the tube-end itself I stop the tube
short with the bottom of recess in tube-hole, so as to obtain as broad an end
bearing surface as possible for the tube to butt against. When the ferrule is loose,
I slightly taper one end of the tube, so as to ensure a good fit between it and the
ferrule, (the tube-end passing through the tube-hole in the usual manner), the end
bearing surface is then formed by the end of ferrule and bottom of recess in
tube-hole.
My improvement as herein described is applicable for fastening both ends of the
same tube, but when the U-shaped ferrules are formed out of the tube-ends
themselves, I do not recess the tube-hole through which the tube has to pass to be
placed in position. When the ferrules are loose on the tube I prefer to recess the
holes in both tube-plates.
After the tube is in position it is lightly expanded into the tube-holes by an
ordinary tube-expander the rollers of which may be parallel.
Dated this Fifth day of January 1893.
GEORGE WILSON.
COMPLETE SPECIFICATION.
An Improvement in Fastening Boiler or other Tubes into Tube-
plates, whereby they are kept Tight by the Action of the Steam
or other Pressure.
I, GEORGE WILSON of Thirteen Victoria Street in the City of Westminster
Civil 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 following statement :-
My invention consists in recessing for a considerable portion of its depth, the
hole in the tubeplate on the pressure side, which recess may be parallel, or slightly
taper to the length of the tube, and inserting into this recess, and encircling the
tube, a U-shaped ferrule, which ferrule may be of metal and loose upon the tube,
or preferably formed out of the tube-end itself.
By this means I obtain a circular flexibility of the tube-end in the tube-hole, and
also an end bearing surface of sufficient width to cover any distortion of the tube-
hole by unequal expansion or other causes.
I also obtain the internal steam or

page_text: other pressure to force and expand the U-shaped ferrule, or tube-end, into the
tube-hole and recess.
When the U-shaped ferrule is formed out of the tube-end itself I stop the tube
short with the bottom of recess in tube-hole, so as to obtain as broad an end
bearing surface as possible for the tube to butt against. When the ferrule is loose,
I slightly taper one end of the tube, so as to ensure a good fit between it and the
ferrule (the tube-end passing through the tube-hole in the usual manner), the end
bearing surface is then formed by the end of ferrule and bottom of recess in the
tube-hole.
My improvement as herein described is applicable for fastening both ends of the
same tube, but when the U-shaped ferrules are formed out of the tube-ends.
themselves, I do not recess the tube-hole through which the tube has to pass to be
placed in position. When the ferrules are loose on the tube I prefer to recess the
holes in both tubeplates.
After the tube is in position it is lightly expanded into the tube-holes by an
ordinary tube expander, the rollers of which may be parallel.
In order that my invention may be more readily understood I have attached
hereunto a sheet of drawings to which I will now refer.
In the said drawings-
Figure 1 is a longitudinal section of part of the tube shewing its junction with
the tubeplates in which the loose U-shaped ferrule is employed.
Figure 2 is a longitudinal section of part of the tube shewing its junction with
the tubeplates in which the U-shaped ferrule is formed out of the tube-end itself
and in which the recess in tubeplate is parallel to the length of the tube.
Figure 3 is a longitudinal section of part of the tube shewing its junction with
the tubeplates in which the U-shaped ferrule is formed out of the tube-end itself
and in which the recess in tubeplate is slightly taper to the length of the tube.
A is a portion of the smokebox tubeplate.
B a portion of the firebox tubeplate.
C the end of tube.
D the recess on pressure side of tubeplate.
E the U-shaped ferrule either loose on or formed out of the tube-end itself.
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-Recessing for a considerable portion of its depth the tube-hole on the
pressure side of the tubeplate and inserting into this recess the tube-end or
ferrule, thereby obtaining an end bearing surface for the tube or ferrule to butt
against.
2-Forming a tube end or ferrule so that it is free to expand by the action of
the steam or other pressure into or against the side of said recess or tube-hole
substantially as hereinbefore described and illustrated by the drawings.
Dated this Thirty-first day of January 1893.
GEORGE WILSON.