Improvements in Tubes for Locomotive and Marine Bollers.
Year: 1893

page_text: Date of Application, 16th Sept., 1893
Complete Specification Left, 15th June, 1354-Accepted, 28th July, 1894
[Communicated from abroad by Mr. JOHN SHOTTON, of the Ottoman Railway,
Smyrna, Turkey in Asia, Engineer.]
Improvements in Tubes for Locomotive and Marine Bollers.
I WASHINGTON HUDSON of No. 2 Elliscombe Villas Charlton in the County of
Kent Consulting Engineer do hereby declare the nature of this invention to be as
follows:-
The object of nty invention is to prevent the leaking of loco. and marine boiler
tubes by allowing for the expansion and contraction of the tubes, thereby taking
the excessive pressure off the tube plate. I form on one or both ends of the tubes
one or more corrugations or undulations, which allows the tube to give and take in
length by the elasticity of the corrugations. I sometimes prefer to make the
corrugated end or ends of the tube seperate and either braized, welded or screwed
to the tube, as the tubes expand more than the casing the tube plate is overstrained
and sometimes cracks between the holes or the tube moves in the holes causing
leakage or the tubes are distorted in length and in time tends to cause fracture.
I form the corrugations by rolling either with a specially arranged "tube-expander"
or by rollers one inside the tube and one outside and fed together by adjustable.
mechanical means or I may prefer to "draw the tubes through dies and by
turning at the same time produce a helical corrugated tube especially in the case of
brass or copper.
"
1000
COMPLETE SPECIFICATION.
Improvements in Tubes for Locomotive and Marine Boilers.
I WASHINGTON HUDSON of 2 Elliscombe Villas Old Charlton in the County of
Kent Consulting 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 :-
The object of this invention is to prevent the leaking and bursting of tubes.
in locomotive and marine boilers, and the cracking of the tube plates between the
holes, by providing and allowing for the expansion and contraction of the tubes,.
thereby taking the excessive pressure off the tube plates by giving elasticity to the
tubes. As the tubes expand more than the boiler casing the tubes are distorted in.
length and tend to cause fracture.
I first form corrugations undulations or grooves in seperate short pieces of tube
and then secure them to one or both ends of the boiler tubes by braizing welding or
screwing thereto. By this means it becomes practically easy to form any kind of
corrugated or undulated grooves either parallel or spiral with the special tools.
hereinafter described, that by rollers or dies.

page_text: .
the corrugations, undulations or grooves by means of dies. The outside dies D, D,.
are in two parts and have the corrugations formed in them. The inside roller or
die I make in several parts E, with a central core F, either flat round or other
suitable section, so that when the core is withdrawn the other parts can be released
and taken out. G, G, are collars or clamps for holding the parts together
temporally. I press the whole under a steam hammer or screw or hydraulic press
and at the same time turn the tube round.
Any kind of grooves can be formed by this tool either parallel or helical and the
metal can be drawn or worked cold.
Figs. 4 and 5, are two sections of another form of tool I use for rolling the said
corrugations, undulations or grooves in which case the metal tube is rolled hot.
H is the outside roller with one end prolonged so as to connect to the spindle of a
drilling machine, or it may be turned by hand or mechanical power. H¹ is the
inside roller also working in bearings in the frame I, with springs J and screw K for
setting up the pressure required. The rollers are male and female with their
corresponding grooves and projections to suit, one roller being also made small
enough to be withdrawn after the grooves are rolled as required.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner it is to be performed I declare that what 1 claim is
1st. Forming corrugations, undulations or other grooves in short pieces of tube
and securing them to the end or ends of the tubes for locomotive and marine boilers
substantially as described.
2nd. The tools for pressing, rolling and forming the said corrugations, undulations
or grooves substantially as described.
Dated this 14h 1
100