IMPROVEMENTS IN THE Construc- TION OF APPARATUS FOR CUTTING BARS OR TUBES OF METAL
Year: 1880

page_text: LETTERS PATENT to John Walker Newall, of Salford, in the County of
Lancaster, Engineer, for an Invention of "IMPROVEMENTS IN THE Construc-
TION OF APPARATUS FOR CUTTING BARS OR TUBES OF METAL."
PROVISIONAL SPECIFICATION left by the said John Walker Newall at the
Office of the Commissioners of Patents on the 9th January 1880.
JOHN WALKER NEWALL, of Salford, in the County of Lancaster, Engineer.
"IMPROVEMENTS IN THE CONSTRUCTION OF APPARATUS FOR CUTTING BARS OB
TUBES OF METAL."
This Invention is particularly designed for the purpose of cutting off definite
lengths from the end of a hexagonal tube of metal for the purpose of forming nuts,
but it is also equally applicable for cutting off the ends of bars or tubes of metal
(whether hot or cold) for other purposes.
The principal novel feature of this Invention is that the tube or bar is cut
through by means of two or more revolving chisel-edged discs or cutters, which are
carried in a frame which at the same time revolves and carries the discs or cutters
round the tube or bar being cut.
The revolving frame is carried in suitable bearings, and is caused to revolve by
means of a steam engine or other motive power.
The discs or cutters are mounted in radial slides in the said frame, and are
gradually forced forwards towards the centre of the tubo or bar by means of excen-
trics, which are caused to revolve partially by means of toggle jointed links or levers
attached to a sliding bush or sleeve.
This bush is caused to slide for the purpose of forcing forward or withdrawing
the cutters by means of a lever worked by hand or by any suitable mechanism.
The bar or tube to be cut may also be moved forward after each cut, either by
hand or by any convenient mechanism, according to the requirements of the case.
For most purposes it is preferable to heat the bar or tube to a red heat before
cutting, but for some purposes (especially for tubes of only moderate thickness) the
metal can be cut cold.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Walker Newall in the Great Seal Patent Office on the 8th July
1880.
JOHN WALKER NEWALL, of Salford, in the County of Lancaster, Engineer.
"IMPROVEMENTS IN THE CONSTRUCTION OF APPARATUS FOR CUTTING BARS OR
TUBES OF METAL"
This Invention is particularly designed for the purpose of cutting off definite
lengths from the end of a hexagonal tube of metal for the purpose of forming nuts,
but it is also equally applicable for cutting off the ends of bars or tubes of metal
(whether hot or cold) for other purposes.
The principal novel feature of this Invention is that the tube or bar is cut
through by means of one or more rotary chisel-edged discs or cutters, which are
carried in a frame which revolves and carries the discs or cutters round the bar or
tube being cut, the rotary cutters being at the same time gradually pressed inwards,
so as to cut into and divide the said bar or tube.
Such being the nature and object of my said Invention, I will now proceed to
describe in detail the manner in which the same is to be or may be performed or
carried into practical effect; and in order that the same may be clearly understood
I have annexed hereunto a Sheet of Drawings illustrative thereof, and have marked
the same with figures and letters of reference corresponding with those in the
following explanation thereof.
Fig. 1 in the annexed Drawing is a vertical section, and Fig. 2 a face view of any
improved apparatus.
The revolving frame consists of a disc a, a, attached to a hollow spindle b, b, which
is carried in suitable bearings in a head-stock c, c, and is caused to revolve by means
of a steam engine or other motive power.
The discs or cutters d, d, are mounted in slides c, c, moving in radial slides f.f, in
the face of the said disc a, a, and are gradually forced inwards by means of toggle-
jointed links and levers g, g, attached to a sliding sleeve h, h.
This sleeve h, h, is caused to slide for the purpose of forcing forward or with-
drawing the cutters d, d, by means of a lever worked by hand or by any suitablo
mechanism, and provided with a fork working in the groove i, i, formed therein.
It is mounted on a key or otherwise on the tube b, b, so that it can be moved
longitudinally thereon, but is at the same time compelled to revolve therewith.
The bar or tube to be cut is placed upon a table k, l, close up to the front of the
revolving disc a, a; this table is made to rise and fall so that the centre of the tubo
may always he made to correspond with the centre of the revolving disc.
When it is desired to cut off a piece of bar or tube the said bar or tubo is placed
upon the table k, k, with so much of its end projecting within the cutters d, d, as it
may be desired to cut off.
The bar is then clamped fast, the revolving disc a, a, set in motion, and the cutters
d, d, pressed inwards by sliding the sleeve h, k, in the direction of the arrow, when
they will separate the metal, and the piece so separatod will fall into the hollow
spindle b, b, and escape at the far end thereof. The bar is then unclamped, pushed
forward to the extent required, and the operations begin again.
The different motions required to clamp and unclamp the bar move the cutters
d, d, and feed forward the bar, may, if desired, be so arranged and connected together
by means of gearing that these operations shall be performed automatically, and each
at the proper moment relatively to the others.
It will be seen that since the cutters separate the metal without tearing it, as in
the case of saws, that there will be practically no waste, while the surface left will
be much less ragged.

page_text: For most purposes it is preferable to beat the bar or tube to a red heat before
cutting, but for some purposes (especially for tubes of only moderate thickness) the
metal can be cut in the cold state.
Having now described the nature and object of my said Invention, together with
the manner in which the same is to be or may be performed or carried into practical
effect, I wish it to be understood that I claim as my Invention the construction of
the improved apparatus for cutting bars or tubes of metal, consisting of one or more
rotary cutters revolving on their own axes, which cutters are held in suitable frame-
work and revolved around the bar or tube to be cut, and at the same time pressed
inwards, so as to divide the said bar or tube, substantially as hereinbefore described
and illustrated by the Drawings annexed.
In witness whereof, I, the said John Walker Newall, have hereunto set my
hand and seal, this Sixth day of July, in the year of our Lord One thousand
eight hundred and eighty.