IMPROVEMENTS IN TOOLS AND CUTTERS FOR BORING TAPER HOLES "
Year: 1882

page_text: LETTERS PATENT to John Graham Perkin and James Scott both of Sandal
near Wakefield in the County of York for an Invention of "IMPROVEMENTS
IN TOOLS AND CUTTERS FOR BORING TAPER HOLES "
PROVISIONAL SPECIFICATION left by the said John Graham Perkin and
James Scott at the Office of the Commissioners of Patents
10th October 1882.
on the
JOHN GRAHAM PERKIN and JAMES SCOTT both of Sandal near Wakefield in the
County.of York "IMPROVEMENTS IN TOOLS AND CUTTERS FOR BORING TAPER
HOLES
"
Our improvements in tools and cutters are particularly applicable for boring out
the taper holes in the top boxes of fuel economizers similar to that described in the
Specification of our Patent N° 3502 Dated 22nd July 1882 and the object of
such tools and cutters is to bore such holes from the interior of the top box, having
their inner diameters larger than the outside diameters and is as hereafter
described.
We provide a circular tool box which is mounted and keyed on a vertical spindle.
This tool box is recessed to receive any required number of cutters which are held
therein by circular springs which embrace them. In order to prevent any
movement end ways the tool box is retained in position by end plates provided on
the spindle. The aforesaid springs not only hold the cutters in position but allow
them to be expanded at one end to suit the required taper of the holes to be bored.
In order to expand the cutters we provide a vertical screw or rod furnished with
a taper piece at its upper end, this taper piece is moved up between the cutters
after the tool is brought into position for boring causing them to expand bringing
them thereby to the same taper to which the hole is required to be bored.
The spindle carrying the cutters is caused to revolve and may be raised or
lowered by ordinary means.
The aforesaid construction of tool and cutter is applicable for boring other taper
holes than those in the top boxes of our hereinbefore mentioned fuel economizer..

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Graham Perkin and James Scott in the Great Seal Patent
Office on the 10th April 1883.
JOHN GRAHAM PERKIN and JAMES SCOTT both of. Sandal near Wakefield in the
County of York 'IMPROVEMENTS IN TOOLS AND CUTTERS FOR BORING TAPER
HOLES
"
"
Our Improvements in tools and cutters are particularly applicable for boring out
the taper holes in the top boxes of fuel economizers similar to that described in the
Specification of our Patent No 3502 dated 22nd July 1882 and the object of such
tools and cutters is to bore such holes from the interior of the top box, having
their inner diameters larger than the outside diameters and is as hereafter
. described.
We provide a circular tool box which is mounted and keyed on a vertical spindle.
This tool box is recessed to receive any required number of cutters which are held
therein by circular springs which embrace them. In order to prevent any
movement end ways the tool box is retained in position by and plates provided on
the spindle. The aforesaid springs not only hold the cutters in position but allow
them to be expanded at one end to suit the required taper of the holes to be bored
In order to expand the cutters we provide a vertical screw or rod furnished with
a taper piece at its upper end, this taper piece is moved up between the cutters
after the tool is brought into position for boring causing them to expand bringing
them thereby to the same taper to which the hole is required to be bored.
The spindle carrying the cutters is caused to revolve and may be raised or
lowered by ordinary means.
The aforesaid construction of 'tool and cutter is applicable for boring other taper
holes than those in the top boxes of our hereinbefore mentioned fuel economizers.
And in order that our invention may be more completely understood reference
is given to the accompanying sheets of drawings and to the letters and marks
thereon:-
DESCRIPTION OF DRAWINGS
Figs 1 and 2 are respectively a front and side elevation showing arrangement of
machine with our tool and cutters applied Fig 3 is a plan looking at the top of
the machine Fig 4 is a vertical section and Fig 5 a plan shewing general
arrangement of tool and cutters, also the means employed for adjusting the same
The upright or standard of the machine is shown at a in front of which in
. bearings b and c of ordinary construction is mounted the vertical spindle d. The
required rotary motion is imparted to the spindle d, through pulley 6, worm f, and
worm wheel g. The spindle d is so provided with a keyway that it may be
made to move freely up and down on the key in the worm wheel g
In order to bring the cutter spindle & quickly up or down into position for
cutting we employ frictional rope gearing which consists of a small drum li koyed
on to the shaft i carrying the driving pulley e also the rope pullies / and 1. Ono
rope m is secured to and passed round the outer rope pulley and then taken on
to and round the drum. The second rope n is secured to and passed round the
pulley also over the guide pulley o and weighted at p. On the shaft r carrying
the pullies and is keyed a rack pinion q which is in gear with a circular rack 8
fixed to the vertical spindle d. The driving pulley e rotates in the direction
shewn by arrow. In order to move the spindle upwards the rope m is pulled by
the attendant at t which causes it to bind on the drum h and is thereby set in

page_text: motion and being attached to and passed round the pulley it causes it to rotate
actuating thereby the rack pinion q and the racks thus imparting the upward
movement to the spindle d. On the pressure being taken off the rope m the
weight p moves the pullies and in the opposite direction thus causing the
spindle to move down as far as the adjustable stop u will permit When in this
position the cutters are expanded to the required extent in the manner hereafter
described
At Figs 4 and 5 d is the vertical spindle the lower end thereof is turned down
to receive the circular tool box v which is keyed thereon' This circular tool box v
is provided with any required number of recesses to receive the cutters w which
are held therein by the circular springs which embrace them. In order to prevent
any movement endways the tool-box v is retained in position by the plate x, which
is adjusted to its position and held there by the set screw y. The cutters ware
suspended from the screws z which are carried in the top plate 1.
The circular springs 2 and 3 not only hold the cutters w in position but allow
them to be expanded to suit the required taper of the holes to be bored. In order
to expand the cutters w we provide the vertical screw 4 which passes through a
nut fixed in the boss of the bevil wheel 5. This nut may be caused to rotate in
its bearing within the bracket 6 at pleasure by the attendant through the medium
of the bevil wheels 7 and 5 and handle 8 By this means the screw 4 can be
raised or lowerd at pleasure. The screw 4 is furnished with a taper piece 9 at its
upper end which may be moved upwards between the cutters w into the position
shewn in Fig 4 that is to say when the cutters w are brought down into position
for boring, thus expanding and thereby bringing them to the taper to which the
holes are required to be bored The taper piece 9 is fitted into the top of the
screw 4 and retained in position by the screws 10 the reduced ends of which 11 pass
into a circular groove provided in the taper piece 9. By this arrangement the
taper piece 9 can rotate with the cutters w when brought in contact therewith.
12 Fig 4 represents a portion of the top box of a fuel economizer and the cutters
are shewn in position for boring
The aforesaid construction of tool and cutters is applicable for boring other holes
besides those in our herein before mentioned fuel economizers
Having now described the nature of our said Invention and shewn by the aid of
drawings how the same may be carried into practice we would have it understood
that we do not limit ourselves to the precise details and configuration of the parts
we have described and shown as the same may be varied and modified without
departing from the nature of our said Invention but what we do claim is:
The arrangement construction and application of the circular tool box v
provided with cutters wand the means employed for operating and expanding the
same substantially as and for purposes herein set-forth.
In Witness whereof I the said James Scott for and on behalf of the said
John Graham Perkin and myself have hereunto set my hand and seal this
twentieth day of March in the Year of Our Lord one thousand eight
hundred and eighty three.
JAS SCOTT (L.S.)