Tube Cutter.
Year: 1891

page_text: Date of Application, 19th Aug., 1891
Complete Specification Left, 9th May, 1892-Accepted, 11th June. 1892
PROVISIONAL SPECIFICATION.
Tube Cutter.
GEORGE BURTON 87 Neville Road, Forest Gate, in the County of Essex, Boiler
Maker. I do hereby declare the nature of this invention to be as follows:-
An apparatus for cutting tubes out of tubular boilers for the purpose of removing
them with greater despatch.
Description as follows:-
Tubular cutter in two equal parts with oblong graduated center hole, the two
parts held together with india rubber or other springs.
Oval taper mandril.
COMPLETE SPECIFICATION.
Tube Cutter.
I GEORGE BURTON of 87 Neville Road Forest Gate in the County of Essex
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:-
My invention has for its object to provide a tube cutter more especially intended
for use in removing tubes from tubular boilers with readiness and despatch.
According to my invention I make the instrument in parts which can be moved
apart by means of a mandril or the like inserted in or between them so that a cutter
or cutters carried by the instrument is or are caused to cut the tube.
The accompanying drawing represents a tube cutter constructed in accordance
with my invention.
Figure 1 shews the instrument inserted into a tube with the cutters in the act of
cutting into the tube.
Figure 2 is a front view and Figure 3 a rear view of the instrument and
Figure 4 is a longitudinal view of one of the parts separately as seen from the
inner side.
The instrument is made in parts A A² having on their outer sides the
cutters a a². There is a hole (preferably of the elliptical and taper formation
shewn) lengthwise between the parts into which a similarly formed mandril or
drift B is inserted and driven to move the parts A and A' away from each other.
ccare flanges on the parts A A2 for giving a bearing against the ends of the tube
and tube plate for retaining the instrument in position. These flauges may for
convenience he made separately from the parts A A² and be attached thereto for
instance by screws c². D is a spring here shewn as a strong vulcanised rubber.
spring but it may be of any other kind and may encircle any convenient part of the
instrument. I have shewn at d a coiled metal spring encircling the inner part of
the instrument for example.
When the instrument is in use it is inserted into the end of the tube as shewn in
Figure 1 and the mandril or drift B is driven into the hole therein moving apart
the parts A and A² and causing the cutters a a² to penetrate the tube. On with-
drawing the mandril or drift the parts come together again under the action of the
spring and the instrument can be turned round a quarter turn so that the cutters
come opposite the parts of the tube not severed by the previous operation and by
again driving in the mandril or drift the cutters a a³ again penetrate the tube and

page_text: complete its severance. The same operation is then performed at the other end of
the tube or two men may operate each with a tool at each end of the tube at the
same time.
I do not limit myself to the making of the instrument in two parts as it may be
made in more than two parts if desired. Neither do I limit myself to the spring
arrangement shewn for returning the parts to their normal position as any suitable
arrangement may be used for the purpose. Nor do I limit myself to the shapes of
the hole and mandril shewn as they may be varied for instance the mandril
may be of a simple or flat wedge form to be passed into a hole between the parts A
and A² of proper shape to receive it.
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 cutter consisting of parts (such as A and A³ for example) carrying
cutters which when the said parts are placed in the tube can be moved apart to
cause the cutters to penetrate the tube substantially as hereinbefore explained.
2. A tube cutter, consisting of the parts A and A2 carrying cutters and an
encircling spring for returning them to their normal position and a hole between
them for the insertion of a mandril or drift for moving them apart substantially as
hereinbefore described and illustrated in the accompanying drawings.
Dated this 9th day of May 1892.
J. H. JOHNSON & Co.,
Agents.