Year: 1888

page_text: Date of Application, 9th Mar., 1888
Complete Specification Left, 10th Dec., 1888
Complete Specification Accepted, 5th Feb., 1889
I, DAVID PUGH, of No. 88, Carlisle Street, Cardiff, in the County of Glamorgan,
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to an improvement in apparatus for stopping a leaky tube in
a marine boiler.
In carrying my invention into effect, I take a rod of a suitable length, and form
upon it two circular enlargements, one near each end. An annular recess of a suitable
cross section is formed in the outer face of each enlargement. The ends of the rod are
screwed, and each fitted with a nut. A cramp is provided for each end of the stopper,
which can be tightened up towards the enlargement by the said nut. A projection is
formed upon the face of the cramp, and is adapted to enter the said annular recess for
the purpose of expanding a ring of elastic packing material, previously placed therein,
against the internal surface of the leaky tube.
A square is provided on one end of the stopper, so that it may be held fast while the
nuts above mentioned are being screwed up.
1000
PHILLIPS & LEIGH,
22, Southampton Buildings, Chancery Lane,
Agents for the Applicant.

page_text: I, DAVID PUGH, of No. 88, Carlisle Street, Cardiff, in the County of Glamorgan,
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 relates to an improvement in apparatus for stopping leaky tubes in a
marine-boiler.
In order that my invention may be more fully understood, I will now proceed to
describe the same in detail referring in so doing to the accompanying drawings which
are to be taken as part of this specification and read therewith.
Fig. 1. is a longitudinal elevation of a tube stopper constructed according to my
invention and fixed in position within a boiler tube.
Fig. 2 is a sectional elevation illustrating a modified form of my tube stopper and
its operation.
Fig. 3 is a sectional elevation of one end of the stopper illustrated in Fig. 1.
Similar parts are marked throughout the figures with the same reference letter.
Referring to Figs. 1 and 3, A is one of the boiler end plates; and B, part of a tube.
.C is a rod of suitable length terminating at each end in a solid cone c, c of a convenient
diameter for the purpose of my invention. I form an annular groove in the edge of
the base of each cone for the purpose of providing a seat for a ring d of Tuck's, or
other suitable, packing.
E, E are circular cramps of a proper diameter for compressing the rings of packing d
between them and the cones, for the purpose of bolding them water and steam-tight
against the inner face of the boiler tube.
For the purpose of tightening the cramps up upon the packings, I drill and tap the
cone-bases to receive screws f. The cramp is also bored to allow the screw to pass
through it freely. A square f¹ is formed upon the end of the screw by means of
which it can be held steady while the tightening nut f2 is being screwed up.
The advantages of the cone-ends are, 1st, a tube stopper is more easily and readily
inserted in the tube if the end be coned, and 2nd, if after the stopper has been got
into the tube, it be pushed too far until the end drops from the tube into the combustion
box, then the cone facilitates the return of the stopper end into the tube.
In the figures above described the stopper rod or shank C and conical ends c c are
shown as made in one piece, e.g., of cast iron. 1 wish it to be distinctly understood
that my invention does not confine itself to making the shank C and ends c, c in one
piece, or of either wrought or cast iron.
According to the modification illustrated in Fig. 2, the shank C is a length of round.
iron having a screw fcut on each end and terminating in a square f¹. The cones c
are loose, and are kept apart and in their proper relative positions by a distance tube g
slipped over the shank C before the second cone is passed on to it.

page_text: 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. The combination of cone, annular groove, cramp adapted to enter the same, and
a screw and nut device for approaching the cramp towards the cone without turning
either of the latter, as set forth.
2. The combination of shank or rod, a pair of cones, cramps, packing rings, and
devices for compressing and expanding the rings between the said cramps and cones
and against the internal face of the tube, as set forth.
Dated thin 9th Jan of Dana 1000
PHILLIPS & LEIGH,
No. 22, Southampton Buildings, Chancery Lane, W.C.,
Agents for the Applicant.