Improvements in Machinery for Finishing Cast Hollow-ware.
Year: 1893

page_text: Date of Application, 25th Jan., 1893
Complete Specification Left, 24th Oct., 1893-Accepted, 23rd Dec., 1893
1
PROVISIONAL SPECIFICATION.
Improvements in Machinery for Finishing Cast Hollow-ware.
I, STEPHEN WILLIAM CHALLEN, of Derwent Foundry, Constitution Hill, in
the City of Birmingham, Engineer, do hereby declare the nature of this invention
to be as follows:-
My invention relates to the manner in which I construct and arrange machinery
for turning or finishing the interior of saucepans or other cast hollow-ware by the
expenditure of less labour and time, and by a simpler and more effective process
than that in ordinary and common practice.
The object of my invention is to construct and arrange a machine which shall be
capable of producing a fine smooth surface upon the cylindrical and bottom interior
surfaces of the saucepan or other cast hollow-ware in one operation, leaving the
surface ready to be tinned without the necessity of polishing or in any way
improving the surface.
In one method of carrying my invention into effect I mount a strong spindle
between bearings on the headstock of a lathe driven directly by worm or toothed
gearing and by belt and pulley; and upon this spindle I mount a chuck or
holder in which I provide a circular recess having the shape and configuration of
the exterior of the saucepan or other vessel which I wish to operate upon. I
preferably arrange the holder in two halves or segments the one half hinged to the
other on one side, and on the other side I arrange a hinged screw and nut for
clipping these two segments together, and so firmly securing the saucepan or other
vessel within the recess formed in the chuck or holder to receive it. Upon the
opposite side of the lathe bed or frame I mount a headstock capable of adjustment
in a direction parallel with and at right angles to the length of the bed. A milling
cutter is screwed or otherwise securely fastened to the overhanging end of a
rotating spindle mounted in the bearings of this headstock and driven at the proper
surface speed by toothed wheels and cone pulleys in the ordinary manner; and
this rotating cutter is capable of being introduced into the interior of the vessel to
be operated upon by the action of a screw, lever, or rack and piniou, in any well
known manner. The diameter of the cylindrical milling cutter is equal to about
one half the diameter of the interior bottom of the vessel, and its length is equal
to that of the interior depth of the vessel, and has its cylindrical surface and end
surface cut, for action upon the cylindrical interior and upon the bottom interior
surfaces respectively, of the vessel. In the case of a milling cutter for operating
upon a saucepau a curve or taper from the middle to each end of the milling cutter
would be required in order that the necessary curvilinear contour might be given to
the interior of the saucepan.
The milling cutter operates simultaneously upon a line extending from the centre
of the bottom of the saucepan or vessel to the largest diameter of the bottom and
thence along the barrel or other shaped wall of the vessel to the rim so that when
the saucepan has been caused to revolve once the whole of its interior surface has
been milled.
The action of the machine would be as follows:-
The saucepan or other similar vessel is placed within the chuck holder and firmly
secured in position, and the chuck together with the saucepan are caused to rotate
slowly.
The milling cutter which is caused to rotate at a proper speed is then introduced
within the interior of the vessel and is caused to bear upon the interior cylindrical
surface and upon the bottom interior surface thereof; and as the vessel is slowly
rotated the eutire surface of the interior is milled after one revolution of the
.

page_text: saucepan, leaving a fine smooth surface which does not require finishing or polishing
prior to the subsequent process of tinning.
More than one revolution of the vessel may be made if desired to impart extra
finish but with a proper pitch and milling tool I find that the surface is sufficiently
finished at one revolution of the saucepan or vessel.
"
I preferably cast the headstock carrying the spindle on which the chuck or
holder is mounted in one with the lathe bed or frame, thereby obtaining greater
rigidity of construction.
I do not limit my invention to the particular method hereinbefore described of
chucking" the vessel to be operated upon, but employ any other equivalent and
suitable method for securing the vessel to the chuck.
Dated this 24th day of January 1893.
MARKS & CLERK,
13, Temple Street, Birmingham, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Machinery for Finishing Cast Hollow-ware.
I, STEPHEN WILLIAM CHALLEN, of Derwent Foundry, Constitution Hill, in
the City of Birmingham, 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 :-
My invention relates to the manner in which I construct and arrange machinery
for turning or finishing the interior of saucepans or other cast hollow-ware by the
expenditure of less labour and time and by a simpler and more effective process
than that in ordinary and common practice.
The object of my invention is to construct and arrange a machine which shall be
capable of producing a fine smooth surface upon the cylindrical and bottom interior
surfaces of the saucepan or other cast hollow-ware in one operation, leaving the
surface ready to be tinned, without the necessity of polishing or in any way
improving the surface.
In the accompanying sheet of explanatory drawings,
Figure 1 is a front elevation of a lathe which I employ in connection with my
improvements.
Figure 2 is a plan and Figure 3 an end elevation of the same.
Figure 4 is an enlarged sectional plan of a saucepan with the cutting tool in
position, and
.
Figure 5 is an end' elevation or view of the face of the cutter.
In one method of carrying my invention into effect I mount a strong spindle
between bearings on the headstock of a lathe driven directly by worm or toothed
gearing and by belt and pulley; and upon this spindle I mount a chuck or
holder A in which I provide a circular recess a having the shape and configuration
of the exterior of the saucepan or other vessel which I wish to operate upon. I
preferably arrange the holder A in two halves or segments the one balf A hinged
to the other A on one side, and on the other side I arrange a hinged screw and
nut for clipping these two segments together, and so firmly securing the saucepan
or other vessel within the recess formed in the chuck or holder to receive it. Upon
the opposite side of the lathe bed or frame I mount a headstock B capable of
adjustment in a direction parallel to and at right angles to the length of the bed.
A milling cutter C is screwed or otherwise securely fastened to the overhanging
end of a rotating spindle D mounted in the bearings of this headstock B and driven
at the proper surface speed by toothed wheels and cone pulleys in the ordinary
manner; and this rotating cutter is capable of being introduced into the interior
of the vessel to be operated upon by the action of a screw E, lever, or rack and
pinion in any well known manner.

page_text: The diameter of the cylindrical milling cutter C I make equal to about one half
the diameter of the interior bottom of the vessel such as F, and its length is equal
to that of the interior depth of the vessel, and has its cylindrical surface and end
surface cut for action upon the cylindrical interior and upon the bottom interior
surfaces respectively of the vessel. In the case of a milling tool for operating upon
a saucepan a curve or taper from the middle to each end of the milling tool would
be required in order that the necessary curvilinear contour might be given to the
interior of the saucepan.
The milling tool operates simultaneously upon a line extending from the centre
of the bottom of the saucepan or vessel to the largest diameter of the bottom and
thence along the barrel or other shaped wall of the vessel to the rim so that
when the saucepan has been caused to revolve once, the whole of its interior
surface has been milled.
The action of the machine would be as follows:-
The saucepan or other similar vessel F is placed within the chuck holder A A¹
and firmly secured in position, and the chuck together with the saucepan are caused
to rotate slowly by pulleys and worm or other ordinary mechanical gearing such
as G H K. The milling cutter C which is caused to rotate at a proper speed is
then introduced within the interior of the vessel and is caused to bear upon the
interior cylindrical surface and upon the bottom interior surface thereof; and as
the vessel is slowly rotated the entire surface of the interior is milled after one
revolution of the saucepan, leaving a fine smooth surface which does not require
finishing or polishing prior to the subsequent process of tinning.
$6
More than one revolution of the vessel may be made if desired to impart extra
finish, but with a proper feed, or pinch" and a proper milling tool find that
the surface is sufficiently finished at one revolution of the saucepan or other
vessel.
I preferably cast the headstock L carrying the spindle on which the chuck or
holder is mounted in one with the lathe bed or frame L', thereby obtaining greater
rigidity of construction.
I do not limit my invention to the particular method hereinbefore described of
"chucking "the vessel to be operated upon, but employ any other equivalent and
suitable method for securing the vessel to the chuck.
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. The combination and arrangement of a lathe or machine for use in finishing
cast hollow-ware having a chuck holder carried upon a slowly revolving spindle
upon one headstock or portion of the lathe or machine, and a revolving cutter
or milling tool mounted upon another adjustable headstock substantially as and
for the purposes herein before described and as illustrated in the accompanying
drawings.
2. The construction of milling cutters or tools for finishing hollow-ware having
the cutting edges shaped to suit the interior surface and bottom of such hollow-
ware, substantially as and for the purposes hereinbefore described and as illustrated
in the accompanying drawings.
Dated this 04th day of Databox 1902
MARKS & CLERK,
18, Southampton Buildings, London, W.C., Agents for the Applicant.