AN APPARATUS FOR STOPPING LEAKAGE IN BOILER TUBES
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I WILLIAM POTTER of 1 Albert Cottages, North Woolwich Road, Silvertown,
Essex, Engineer, do hereby declare the nature of my said invention for "AN
APPARATUS FOR STOPPING LEAKAGE IN BOILER TUBES," to be as
IMPROVED
follows:-
The object of this invention is to so construct an apparatus that expansible rings
can be forced outwards by screwing up a shield to prevent leakage in boiler tubes
without materially interfering with the passage through the tube.
For the purpose of my invention I take a tube of any desired length with a
scrow thread cut on each end or near thereto and I fit on each screw thread an
adjustable nut with chamfered or inclined faces to engage against and expand rings
of any soft or expansible metal so as to bulge them outwards.
Between the two expansible rings I arrange abutting rings and also a kind of
sleeve tube formed with one or more slots to permit of movement on the threaded
tabe. On the outer end or ends of the threaded tube I fit a shield to take against
the face of the boiler to protect the person using the apparatus.
The expansible rings may be composed of several rings so placed between the
abutting rings that the inclined surfaces on pressure being applied shall spread
them outwards to the desired extent.
The apparatus can be fitted in a boiler tube from either end, and the opening
through the threaded tube allows of the boiler tube being continued in use. The
threaded tubo may bo in two or more pieces capable of connection in any desired
manner.
H. GARDNER,
166, Fleet Street, London,
Agent for the Applicant.

page_text: COMPLETE SPECIFICATION.
I WILLIAM POTTER of 1 Albert Cottages, North Woolwich Road, Silvertown,
Essex, Engineer, do hereby declare the nature of my said invention for "AN
IMPROVED APPARATUS FOR STOPPING LEAKAGE IN BOILER TUBES," 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 so construct an apparatus that expansible rings
can be forced outwards' by screwing up a shield; to prevent leakage in boiler tubes,
without materially interfering with the passage through the tube.
For the purpose of my invention I take a tube of any desired length with a
screw thread cut on each end or near thereto and I fit on each screw thread an
adjustable nut with chamfered or inclined faces to engage against and expand rings
of any soft or expansible metal so as to bulge them outwards.
-:
Between the two expansible rings I arrange abutting rings and also a kind of
sleeve tube forined with one or more slots to permit of movement on the threaded
tube. On the outer end or ends of the threaded tube I fit a shield to take against
the face of the boiler to protect the person using the apparatus.
The expansible rings may be composed of several rings so placed between the
abutting rings that the inclined surfaces, on pressure being applied, shall spread
them outwards to the desired extent.
The
The apparatus can be fitted in a boiler tube from either end, and the opening
through the threaded tube allows of the boiler tube being continued in use.
threaded tube may be in two or more pieces capable of connection in any desired
manner.
The invention as herein before described is clearly represented in the annexed
drawings in which at Figure 1 I represent the end of a boiler tube A in section
with my improved apparatus in place. Said apparatus consists of a tube B which
tube is screw threaded at each end and may be of any desired length so as to stop
leakage at any part of the boiler tube. The inner end of the tube is provided
with a collar nut C whose inside face D is inclined at any desired angle to swage
out or expand any metallic body E into close contact with the tube A and the
inner tube B when pressure is brought to bear by means of a nut F which' can be
screwed upon the opposite end of the tube B.
Any number of these soft motal packings E can be used on the same tube B,
and in Figure 1 I show two of them with a sleeve tube G, this being in two pieces
for convenience. The ends of the sleeve tube are made with abutting inclined
faces H which act in conjunction with the angle face D of the back ring and the
angle face J of a collar or shield K against which the tightening nut F is caused
to bear. This shield K is of large diameter so as to cover up the opening around
the boiler tube and abutts against the shell L of the boiler which offers a resistance
to the packing rings E, and the sleeve tube G, when the nut F is turned, the 4
tube B being drawn outwards during that operation. The shield K thus formed
serves to protect the person screwing up the nut F from injury from scalding
water,

page_text: Figure 2 is a face view of the boiler plate L with the shield K and nut F exposed
and also the end of the tube B, which it will be seen only slightly reduces the
diameter of the boilor tube A but does not put it out of action as a boiler tube and
this would be the case whether the tube B be of the same length as the tube A
or for part of its length only.
The metallic packing either as solid rings E as represented at Figure 1 or as
separate rings or washers E as at Figure 3 may be increased or diminished in
number at the desire of the person using the apparatus, and the sleeve tube G may
be increased in number and in length by simply screwing any number of inter-
mediate pieces M on, one of which is shown only at Figure 3, the fracture in the
boiler tube in this case being at N.
The sleeve tube G has an annular chamber P around it between the shoulders HH
so that no pressure of the apparatus is exerted on the boiler tube near where the
fracture exists.
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. The improved apparatus or tube stopper having chamfered, inclined, or angled
faces D, H, J, which swage or expand a soft or expansible metal E in solid or ring
form into contact with the boiler tube by an outside nut Fand in combination with
the shield K as described and substantially as shown in the annexed drawings.
2. The angled face sleeve tube G in one or more pieces to make up the desired
length as and for the purpose described.