Improvements in Apparatus for Cutting and Facing Circular and Oval Holes and Rings.
Year: 1886

page_text: Date of Application, 15th Dec., 1886
Complete Left, 15th Sept., 1887
Complete Accepted, 28th Oct., 1887
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Cutting and Facing Circular and
Oval Holes and Rings.
We ANGUS MCCALL of Pembroke Dock in the County of Carmarthen South
Wales, and CLAUDE CARTER of Levenshulme, Manchester, in the County of
Lancaster, Engineers do hereby declare the nature of this Invention to be as
follows:-
Our Invention relates to apparatus adapted principally for application to the
revolvable spindle of a drilling or boring machine and intended for use in the cutting
of circular and oval holes in metal plates, in the cutting of circular or
oval rings and in the facing of annular or curvilinear surfaces. Upon a
short spindle which is adapted to be secured to the main spindle of the machine is
fixed an arm upon which a tool carriage is fitted to slide and upon the same spindle
is mounted an adjustable excentric which is connected with the tool carriage. The
said excentric is fitted to be adjustable upon a wheel or part which is mounted to
revolve upon the said spindle and receives motion by means of gearing from a wheel
which is fixed upon the said spindle, the arrangement being such as that the said
excentric revolves at the same speed as the spindle but in the reverse direction or
revolves in the same direction but makes two revolutions to one of the spindle
according to the nature of the gearing. In an arrangement of gearing which we
have devised for the purpose a bevel wheel fast to the spindle transmits motion through
intermediate pinions to a bevel wheel which is connected with the said excentric in such a
manner as that both revolve together as for example a square boss on the wheel
may fit in a slot in the excentric which latter can be adjusted to be concentric or to
be excentric to any required extent within the limits determined by its proportions.
When adjusted the excentric is fixed by means of screws or of bolts. The said
intermediate pinions are mounted to revolve in a part which is prevented from
revolving with the spindle. A link is fitted to the excentric and is formed with a
A block which is adjustable within the slot in the said arm by means of
slotted arm.
..

page_text: a screw or by suitable means works upon a pin or stud which is fixed to the aforesaid
tool carriage. When the excentric is excentrically adjusted the tool carriage is moved
once to and fro during each revolution of the spindle whereby the tool is caused to
move in an oval path. The proportions of the oval are determined by the adjustment
of the excentric upon the bevel wheel and of the said block within the slot in the
excentric link arm. In place of a link a sliding part acted upon by the excentric and
adjustably connected with the said tool carriage may be used. The lower end of the
spindle may be steadied by working upon a stud fixed to the work or by other
suitable means.
Dated 14th day of December 1886.
DUTTON & FULTON,
1, St. James Square, Manchester,
Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Cutting and Facing Circular and
Oval Holes and Rings.
We ANGUS MCCALL of Pembroke Dock in the County of Pembroke South Wales
and CLAUDE CARTER of Levenshulme Manchester in the County of Lancaster
Engineers 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 and accompanying drawings :-
Our Invention relates to apparatus adapted principally for application to the
revolvable spindle of a drilling or boring machine and intended for use in the cutting
of circular and oval holes in metal plates, in the cutting of circular or oval rings and
in the facing of annular or curvilinear surfaces.
And in order that our said Invention may be properly understood we will now
proceed more particularly to describe the same with reference to the accompanying
2 sheets of drawings.
Fig. 1 of the said drawings is a vertical section of our improved apparatus. A
short spindle a is secured to the main spindle 6 of the boring machine by the cottar c
or by other means. The lower end of the spindle a is steadied on a centre pin or
stud d which may be secured to the work e or to the table, where a space exists in the
work. This steadying centre pin d is requisite or desirable to maintain the spindle a
against the sidelong thrusts to which it is subjected. On the lower part of the
spindle a is fixed an arm fupon which slides a tool carriage or holder 9 carrying a
cutting tool h. Above the said tool holder arm we mount an excentric i which is
carried and driven by the lower squared projecting boss j of a bevel wheel k which
revolves loosely upon the spindle a. The square boss j enters a longitudinal space
through the excentric as seen in the separate views Figs. 2 and 3 of the drawings,
Fig. 2 being a plan of the under side and Fig. 3 a view of the upper side of the
excentric. The said space in the excentric is long enough to permit of its being
adjusted on the boss j so as to vary the throw. The bevel wheel k is driven through
intermediate gearing 11. from another similar bevel wheel m which is fixed on the
spindle a above the wheel k as shown at Fig. 1. The intermediate pinion wheels / l
are carried independently of the spindle a by a carrier n which is supported by a
bracket o fixed to any convenient part of the framing of the machine. The said
carrier n is shown separately and in plan at Fig. 4 of the drawings: It will be seen
that under the illustrated arrangement the bevel wheel k and excentric i will revolve
at the same speed as the spindle a but in a reverse direction. The excentric is
secured in its adjusted position to the bevel wheel k by binding screws p which pass
through slots in the excentric as shown at Figs. 2. and 3. The adjustment of the
excentric to the desired throw is facilitated by a divided scale 9 marked on the face of
the excentric and seen at Fig. 3. The excentric i is surrounded by an excentric
strap r one of the halves of which carries an arm or link ¹ having a longitudinal

page_text: space as clearly seen at Fig. 5 of the drawings. A blocks is fitted to slide in this
space and is adjusted to any desired position by means of a screw t which passes
through a threaded hole in the end of the arm or link and can be turned by a key
or handle fitting on its squared end. The blocks is connected to the sliding tool
holder 9 by a stud so that the sidelong throw or motion of the excentric i is
imparted to the tool holder and tool. If the excentric i is adjusted so as to be
concentric with the spindle a the tool will describe a circle and will cut a circular
hole or ring or face a circular surface; but if the excentric is adjusted out of
truth with the spindle a the tool h will describe an oval curve the proportions of the
oval being determined by the relative adjustments of the excentric on the bevel
wheel k, and the block s in the link as will be well understood. When cutting
rings, two tools set the proper distance apart may be used. In place of the link r¹ a
sliding part acted upon by the excentric and adjustably connected with the said tool
holder may be used. We do not confine ourselves to the exact dispositions of driving
gearing shown and described as these may be modified.
Having now particularly described and ascertained the nature of our said invention
and in what manner the same is to be performed we declare that what we claim is :-
(1.) The general arrangement and combination of apparatus for cutting and facing
circular and oval holes rings and surfaces substantially as hereinbefore described and
shown.
(2.) In apparatus of the indicated nature the employment of an excentric adjustable
with relation to the central spindle and arranged to operate a sliding adjustable tool
holder carried in an arm fixed to the central spindle so as to cause the tool to describe
an oval path when the machine is at work for the purposes and substantially as
herein before described and shown.
(3.) The arrangement of gearing for driving the excentric and actuating the tool
holder in the indicated manner from the central spindle substantially as hereinbefore
described and shown or any mere modification thereof.
Dated this 13th day of September 1887.
DUTTON & FULTON,
1, St. James Square, Manchester.
Agents.