Year: 1888

page_text: I, SYDNEY PITT, of Sutton, in the County of Surrey, Gentleman, (a communication
to me from abroad by John Wheeler Mellen, a citizen of the United States,
residing at Geneva, in the County of Ontario, and State of New York, U.S.A.,
Banker,) do bereby 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 consists in a novel construction of a tube-cutting implement which is
comparatively inexpensive to manufacture, very convenient and efficient in its
operation, and leaves the cut end of the tube in good shape to allow the tube to be
withdrawn through the hole in the flue-sheet and for scarfing and welding it.
The invention is fully illustrated in the annexed drawings, in which―
Figure 1 is a side view of a boiler-tube with my improved tube-cutter in position
for cutting said tube.
Fig. 2 is a longitudinal section of the same.
Fig. 3 is a plan view of the tube-cutting implement.
Fig. 4 is a plan view of the extension of the mandrel, and
Fig. 5 is an enlarged perspective view of that portion of the cutter.proper which is
provided with the cutting edge.
Similar letters of reference indicato corresponding parts.
A represents the mandrel, which is adapted to enter endwise into the end of the
tube T to be cut. To properly sustain the said mandrel in the tube, and at the same
time allow it to freely rotate, I form the mandrel with a circumferential shoulder b,
and journal on the mandrel a collar d, which in the operation of the implement rests
against the end of the tube T and abuts against the shoulder b, as shown in Figs. 1
and 2 of the drawings. The inner end of the mandrel I provide with a screw-threaded
stud s, on which is journaled a roller r, which is of approximately the same diameter
as the interior of the tube and is retained on the stud by a nut n.
Diagonally through the mandrel A from the outer side of the collar d to the inner
side thereof is extended a channel a, and through this channel is extended the cutter
proper c, consisting of a straight bar fitted closely to the interior of the channel, and

page_text: having on the end which is inside of the tube T a rounded chisel-pointed cutting-
edge c. The shank or opposite end of the cutter c is serrated, and on the mandrel is
pivoted an eccentric e, having a serrated face engaging the shank of the cutter and
holding the same in its adjusted position. The outer end of the mandrel is squared
for the application of a wrench by which to revolve the mandrel.
In the operation of my improved tube-cutter the cutter c is to be drawn outward
sufficient to bring the cutting-edge c¹ within the mandrel. Then the latter is introduced
into the tube T and brought to rest with its collar d against the end of the tube. Then
by a blow or blows of a hammer the cutter e is driven in, so as to cause its cutting
edge to penetrate the side of the tube. Then the eccentric is to be turned to lock the
cutter c in its position in the mandrel, and then by turning mandrel the cutter c, turning
with the mandrel, is caused to sever the tube in one revolution of.the mandrel.
The chisel-pointed cutting edge c² of the inclined cutter c produces a beveled cut on
the end of the severed tube, and thereby leaves the same in proper shape to allow it to
be removed through the same hole in the flue-sheet in which it was seated, and also in
suitable shape for scarfing and welding the said end of the tube.
In operating the described implement through a smoke-box a wrench with a pro-
longed shank is to be applied to the outer end of the mandrel, and in order to counter-
balance this wrench I employ an extension A', of the mandrel, said extension being
provided at one end with a screw-threaded socket, by which it is screwed onto the
studs of the mandrel A in lieu of the roller r and nut n. The opposite end of the
extension A¹ is provided with a screw-threaded-stud s¹, to which are connected
the aforesaid roller and nut, as illustrated in Fig. 4 of the drawings.
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. A tube-cutter composed of the mandrel A, provided with a diagonal channel a,
and a cutter c, sustained adjustably longitudinally in said channel to cut the tube
inside of the boiler, substantially as shown.
2. A tube-cutter consisting of a mandrel adapted to enter into the tube to be cut, a
collar on the mandrel abutting against the end of the tube, a channel extending
diagonally through the mandrel from the outer side of the said collar to the inner side
thereof, and a cutter sustained adjustably longitudinally in said channel, substantially
as described and shown.
3. In combination with the mandrel A, having the channel a extending diagonally
through it, the cutter c, extending longitudinally through said channel, and a clamp
on the mandrel engaging the shank of the cutter and holding the same in its position,
as set forth.
a,
the
4. The combination of the mandrel A, provided with the oblique channel
cutter c, extending through said channel and having its shank serrated, and the
eccentric e pivoted to the mandrel and having a serrated face engaging the said shank
of the cutter, substantially as described, and shown.
Dated this 25th day of June 1888