AN IMPROVED APPARATUS FOR SCRAPING OR SCALING BOILER OR OTHER TUBES
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, WILLIAM BOAZ, of 29 West India Dock Road Limehouse, in the County
of Middlesex, Engineer, do hereby declare the nature of said Invention for AN
IMPROVED APPARATUS FOR SCRAPING OR SCALING BOILER OR OTHER TUBES to be
as follows:-
My invention relates to an improved apparatus for scraping or scaling the
interior of the fire tubes of steam boilers for the purpose of removing therefrom the
salt, soot, and other corrosive matters which adhere to the tubes, and by reason of
their accumulation act as a non-conductor of heat.
My improved apparatus consists of a small steel or iron casting or forging
provided with semi-circular ends or half discs, one in advance of the other, and
arranged in opposite directions, which act as the cutting or scraping edges, the two
semi-circles thus forming the complete circle or diameter of the interior of the tube.
The apparatus is formed or cast with taper guide pieces, to guide the apparatus into
the tube after having been passed through from the front end of the boiler, and it
is so constructed that it is impossible for the scraper to get choked as there is a
free passage for any accumulation of salt, soot or other corrosive substance. The
corners of the semi-circular ends or half discs also act as cutters to cut away
any hard deposit of salt which may accumulate through the leaking of any of
the tubes.
A handle is provided which acts as a spring to keep the semi-circular ends or
half discs pressed close against the interior of the tube.

page_text: I, WILLIAM BOAZ, of Limehouse, in the County of Middlesex, Engineer, do
hereby declare the nature of said invention for AN IMPROVED APRARATUS FOR
SCRAPING OR SCALING BOILER OR OTHER TUBES, and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement, reference being had to the accompanying drawings, and to
the letters and figures marked thereon, that is to say:
-
My Invention relates to an improved apparatus for scraping or scaling the
interior of the fire tubes of steam boilers, or other tubes, for the purpose of
removing therefrom the salt, soot and other corrosive matters which adhere to the
tubes, and by reason of their accumulation act as a non-conductor of heat.
And in order that my Invention may be readily understood I proceed to describe
the same with reference to the accompanying drawings.
Fig. 1, is a side elevation of a scraper constructed according to my Invention,
Fig. 2, a plan of same, and Fig. 3, an end view.
-
My apparatus consists of a small steel or iron. casting, or forging, having a
-body A, provided with two semi-circular end-pieces, plates or half discs B, B¹, one
in advance of the other, and arranged in opposite directions, that is to say, one
such semi-circular plate is on the upper side of the body and the other is on the
lower side thereof." These semi-circular end-pieces, plates or half discs B, B¹, act as
the cutting or scraping edges, on the apparatus being moved backwards and
forwards in the tube, and these two semi-circular pieces, when in the tube, form a
. complete circle or diameter of the interior of the tube.. The apparatus is formed or
cast with taper guide pieces b, 61, 62, 63, 64, to guide the apparatus back into the
tube, after it has been passed through, from the front end of the boiler. Owing to
the construction of the scraper it is impossible for it to get choked, as there is a
free passage formed between the semi-circular plates and the body A, for any
"accumulation of salt, soot, or other corrosive substance which has been removed by
the action of the scraper. The corners of the semi-circular end-pieces plates or
half discs also act as cutters to cut away any hard deposit of salt which may
accumulate through the leaking of any of the tubes.
One end of the body is cored out, and is tapped internally to any suitable
distance, to receive one end of a handle C. This handle is flattened for a portion of
its "length, as shewn at c, fig. 7, and acts as a spring to keep the semi-circular end-
pieces, plates or half discs pressed close against the interior of the tube. At its
other end this handle acts as a counterweight.,
101D VIRTUAL
"
__
Figs. 4, 5 and 6 are similar views to 1, 2 and 3, but in this method of construction
the parts constituting the scraper are forged separately, and afterw
and afterwards rivetted
together, whereas in figs. 1, 2 and 3 the apparatus shewn is a casting. At one end
it is provided with a screwed portion c', to receive the handle which, in this case,
is furnished with a tapped socket.
Fig. 7 shews the application of the scraper, represented in figs. 1, 2 and 3 to a
boiler tube.
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. An apparatus for scraping or scaling boiler, or other tubes, consisting of a
body provided with semi-circular end-pieces, plates or half discs, one in advance of

page_text: the other and arranged in opposite directions, the said pieces, plat's or half discs
forming a complete circle when introduced into the tube, substantially as described
and for the purposes set forth.
2. An apparatus for scraping or scaling boiler, or other tubes, consisting of a
body having semi-circular end-pieces, plates or half discs, one in advance of the
other, and in opposite directions to each other, and provided with taper guide
pieces and with a handle acting as a spring, all substantially as described and for
the purposes set forth.
•
3. The special construction and arrangement of scraper, formed by casting, and
as herein described and shewn in figs. 1, 2 and 3 of the drawings.
4. The modified construction of scraper formed by forging, and made in parts,
and then rivetted together, as described and shewn in fig. 4, 5 and 6 of the
drawings.