An Improved Internal Cutter for Boiler and other Tubes.
Year: 1895

page_text: Date of Application, 20th Apr., 1895-Accepted, 1st June, 1895
COMPLETE SPECIFICATION.
An Improved Internal Cutter for Boiler and other Tubes.
I, HENRY HADDON of No. 83 Splott Road, Cardiff, in the County of Glamorgan,
Boiler Maker, 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 object of my invention is the production of an improved internal cutter for
boiler and other tubes, and the utility of the improved internal cutter consists in
the substitution of a rolling cut effected at a right angle with the axis of the tube,
for the obliquely applied hammer and chisel work heretofore relied on.
The invention is more particularly applicable to boiler tubes and it is in
connection with such tubes that the construction and use of it are illustrated and
described; but it is to be distinctly understood that the invention is applicable to
the internal cutting of all metal tubes in situ or otherwise.
Figure 1 is a sectional longitudinal elevation illustrating my invention in cut.
Figure 2 is a transverse sectional elevation shewing my invention in cut.
Figure 3 is a plan corresponding with Figure 1. .
Figure 4 is a front elevation.
Figure 5 is an elevation of the eccentric disc and its pin.
Figure 6 is an elevation of the concentric disc.
Figure 7 is a transverse section taken on the line A-B of Figure 1.
E is the boiler tube to be cut and F is the end plate in which one end of it has
been fixed by the well known expansion.
G is a spindle of a length and strength suitable for the work it has to do. The
operative members of the invention are arranged round or combined with it. J is a
dise or roller held to one end of the spindle G at right angles and concentric with
it. The function of this disc is to serve as a support and guide for the internal end
of the improved cutter, i.e., the end farthest away from the workman, and also
to provide for the free and concentric rotation of the spindle G within the
tube E.
The axis of the spindle G being the axis of rotation for the improved cutter as a
whole, an eccentricity necessary to provide for the cutter proper getting into cut
and completing it. This eccentricity is provided by cranking the front end g of the
spindle G, giving it a sufficient amount of throw for the purpose and combining it
with the eccentric bearing described further on.
K is a disc or roller of a proper diameter to fit in the expanded end e of the
tube E so as to turn smoothly therein in a plane at right angles with the axis of the
said tube. is a hole bored through the disc K to receive the end g journal wise,
the end g being circular in cross section. The said disc K, therefore, forms a
support for the front end g of the spindle G, while the front end g can revolve
freely in the hole k which serves it as the eccentric bearing already mentioned.
The said end g projects through the disc K to the front, where it is prolonged into
a square M adapted to receive a suitable wrench or lever by which the cutter, as a
whole, can be rotated within the tube E.
I is a radial enlargement of the spindle G and occupying a suitable position
thereon to stand within the expansion e when the improved cutter is in working
postion. The radius of it slightly less than the internal radius of the expansion e,
while its length is sufficient to provide a suitable slot i in which is pivotted upon
the axis h, the rolling cutter proper H the edge of which stands, and is adapted to
rotate in, a plane at right angles with the axis of the spindle G.

page_text: L is a pin fast to and projecting from the disc K, in the path of the enlargement I.
It is, preferably, continued through the disc so as to project equally from both sides
of it.
My improved cutter is used as follows. The disc J is pushed into the tube E
past the expansion e, and the disc K set with its eccentricity in line with the said
cutter H, when both the latter can be pushed into the expansion e far enough to
bring the said cutter into the plane of the required cut. The spindle is then
turned about its axis whereupon the enlargement I will overtake the pin L thereby
making the cutter H cut into and through the expansion, as indicated by the
dotted line in Figure 4, because the eccentricity of the axis of the spindle end
relatively with that of the spindle G. This eccentricity also prevents the said
cutter H making a spiral cut.
I do not claim to be the inventor of more than the improved internal cutter for
boiler and other tubes in situ or otherwise but I must point out that the present
invention includes all equivalents for the several operative members of it.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, 1 declare that what I
claim is :-
1. The combination of spindle; concentric disc or equivalent support; cutter
proper support for the front end of the spindle, and a device for putting the cutter
proper into cut, as set forth.
2. The hereinbefore described combination with the spindle aforesaid, of the
several operative members arranged round or combined with it as such spindle and
members are severally hereinbefore described with reference to their respective
functions.
3. The general construction of the improved internal cutter for boiler and other
tubes.
this 20th day of April 1895.
PHILLIPS & LEIGH,
No. 22, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.