An Improved Tube Scraper.
Year: 1892

page_text: Date of Application, 28th Jan., 1892
Complete Specification Left, 12th Oct., 1892-Accepted, 12th Nov., 1892
PROVISIONAL SPECIFICATION.
An Improved Tube Scraper.
I, GEORGE FLETCHER, of Masson Works, Litchurch, Derby, in the County
of Derby, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improved apparatus for scraping or removing scale
and other like deposits from the interior of tubes.
In carrying out my invention I provide a steel bar having attached to or formed
integral with its ends semi-circular steel plates placed at substantially right angles
to the bar, the diameter of the said semi-circular plates being suitable to the
diameter of the tubes to be scraped. The peripherical portions of the said
semi-circular plates are thinned to form edges. To the bar is rivetted a rod
which serves to move the scraper through the tube, the said bar being arranged
sufficiently far from the axial line of the scraper to form a guide for the latter.
In practice the bar is so bent that the centres of the semi-circular plates are
on opposite sides of the axial line of the scraper so that in order to introduce
the scraper into a tube it is necessary to bend the said bar sufficiently to bring
the said centres into practically the same axial line thereby causing the scraping
edges to bear against the interior surface of the tube.
With this construction of apparatus it will be obvious that if a tube becomes
choked or overfull or coated with a hard substance the scraper plates will spring
back and pass over the substance removing the same after being passed backwards
and forwards two or three times.
Dated the 28th day of January 1892.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improved Tube Scraper.
I, GEORGE FLETCHER, of Masson Works, Litchurch, Derby, in the County of
Derby, 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 :—
This invention relates to improved apparatus for scraping or removing scale and
other like deposits from the interior of tubes.
In carrying out my invention I provide a steel bar having attached to or formed
integral with its ends semi-circular steel plates placed at substantially right angles
to the bar, the diameter of the said semi-circular plates being suitable to the
diameter of the tubes to be scraped. The peripherical portions of the said semi-
circular plates are thinned to form edges. To the bar is rivetted or bolted a rod
which serves to move the scraper through the tube, the said bar being arranged
sufficiently far from the axial line of the scraper to form a guide for the latter.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawing, in which :-
Figure 1 is a sectional side elevation of my scraper in a tube; and,
Figure 2 is a plan of the said scraper.
Figure 3 is a section on the line aa
Figure 1.
is the ber of steel or other metal having the turned-up semi-circular ends b, b,

page_text: and c is the rod to which the scraper is connected by bolts d, the said rod as
hereinbefore stated being set sufficiently far away from the axial line of the scraper
that when the scraper is introduced into a tube, as shewn in Figures 1 and 3 in
which e is the tube, the said rod forms with the tube a guide.
In practice the bar is so bent that the centres of the semi-circular plates are on
opposite sides of the axial line of the scraper, as indicated by the dotted lines in
Figure 1, so that in order to introduce the scraper into a tube it is necessary to
bend the said bar sufficiently to bring the said centres into practically the same
axial line, thereby causing the scraping edges to bear against the interior surface
of the tube.
With this construction of apparatus it will be obvious that if a tube becomes
choked or overfull, or coated with a hard substance the scraper plates will spring
back and pass over the substance removing the same after being passed backwards
and forwards two or three times.
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. A tube scraper having semi-circular plates bent in opposite directions at the
two ends of a bar.
2. The combination with a tube scraper constructed as described in the preceding
claiming clause of a rod or handle set away from the axial line so as to form a
guide, substantially as described.
3. The manufacture and use of the improved tube scraper hereinbefore described
and illustrated in the accompanying drawing.
Dated the 12th day of October 1892.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.