Improvements in Tubular Boilers.
Year: 1892

page_text: Date of Application, 4th Apr., 1892
Complete Specification Left, 15th Nov., 1892-Accepted, 26th Nov.,. 1892
PROVISIONAL SPECIFICATION.
Improvements in Tubular Boilers.
I, HENRY BENBOW, of the Royal Western Yacht Club, Plymouth, in the
County of Devon, Chief Inspector of Machinery, Royal Navy, do hereby declare
the nature of this invention to be as follows :-
The ends of the tubes next the combustion chamber are made with a shoulder.
which abuts against a seat turned on the inner face of the tube plate around the
hole through which the tube passes. The end of the tube which projects outside
the tube plate is rivetted or beaded over and preferably fits into a groove in the
outer face of the tube plate. The holes in the other tube plate are made of
sufficient diameter to allow of the shoulders on the tubes to pass through and the
ends of the tubes which fit into these holes are enlarged and are secured either by
being expanded into the holes in the usual manner and by being beaded over on the
outside or by being screwed in.
By this construction the ordinary stays or some of them may be omitted for each
tube itself forms a stay. The thickness of the combustion chamber tube plate may
also be reduced.
I provide for the expansion and contraction of boilers and especially those above
described by forming a groove or corrugation around the combustion chamber tube
plate beyond the outer row of tubes or the same result may be attained by a
groove or corrugation in the curved side of the combustion chamber itself.
Dated this 2nd day of April 1892.
H. BENBOW.
COMPLETE SPECIFICATION.
Improvements in Tubular Boilers.
I, HENRY BENBOW, of the Royal Western Yacht Club, Plymouth in the
County of Devon, Chief Inspector of Machinery, Royal Navy; 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 ends of the tubes next the combustion chamber are made with a shoulder
which abuts against a seat turned on the inner face of the tube plate around the
hole through which the tube passes. The end of the tube which projects outside
the tube plate is rivetted or beaded over and preferably fits into a groove in the
outer face of the tube plate. The holes in the other tube plate are made of
sufficient diameter to allow of the shoulders on the tubes to pass through and the
ends of the tubes which fit into these holes are enlarged and are secured either by
being expanded into the holes in the usual manner and by being beaded over on
the outside or by being screwed in.
By this construction the ordinary stays or some of them may be omitted for
each tube itself forms a stay. The thickness of the combustion chamber tube
plate may also be reduced.
I provide for the expansion and contraction of boilers and especially those above
described by forming a groove or corrugation around the.combustion chamber tube
plate beyond the outer row of tubes or the same result may be attained by a
groove or corrugation in the curved side of the combustion chamber itself.
Figure 1 is a longitudinal section of part of one of the tubes shewing its
junction with the tube plate.
Figure 2 is a longitudinal section of part of a double ended boiler.

page_text: Ca shoulder on the end of the tube which abuts against a seating formed on the
inner surface of the tube plate:
Da circular groove formed around the tube hole on the outer surface of the
plate into which the end of the tube is beaded.
E E are corrugations formed in the outer flanged edge of the tube plate and
extend below the lower row of tube holes.
F is a corrugation formed in the combustion chamber sideplate and extends
below the centre line of furnaces or could be continued the whole length of the
plate with the extreme ends left plain to allow them to be connected together by a
rivetted joint.
HH is a portion of furnace.
JJ of the combustion chamber, and
G G are the ends of tubes inside the boiler.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is :-
1. In boilers the combination of a shoulder near one end of the tube, a seat for
the shoulder formed on the inner surface of the tube plate around the hole through
it and means for securing the end of the tube to the outer side of the tube
plate.
2. In boilers the combination of a shoulder near one end of the tube, a seat for
the shoulder formed on the inner surface of the tube plate around the hole through
it and a groove on the outer surface of the tube plate, into which the end of the
tube is beaded.
3. In boilers the combination of tubes, a tube plate to which the tubes are
rigidly attached and a corrugation in the tube plate around the outer row of
tubes.
4. In boilers the combinations of tubes, a tube plate to which the tubes are rigidly
attached and a corrugation in the curved face of the combustion chamber extending
below the lowest tube.
5. Tubular boilers substantially as described and shewn in the drawings.
Dated this 15th day of November 1892.
CARPMAEL & Co.,
Agents for the Applicant.