Improvements in Drilling Appliances and Attachments.
Year: 1891

page_text: Date of Application, 27th July, 1891
Complete Specification Left, 27th May, 1892-Accepted, 16th July, 1892
PROVISIONAL SPECIFICATION.
Improvements in Drilling Appliances and Attachments.
I, ADOLPH VIELKIND, of 69 Saint Dunstan's Road, West Kensington, in the
County of Middlesex, Electrician, do hereby declare the nature of this invention
to be as follows:-
This invention relates to improvements in drilling appliances and attachments,
and has for its object to produce either triangular or square holes in metal, or other
suitable material.
For the purpose of my invention, and when drilling triangular holes, I employ a
template or cap formed with a triangular hole, and said template is so constructed
that it may be used either with a lathe or with a drilling machine.
The drill I prefer to employ is of blade form, and is provided with a double
cutting edge at its extreme end, that it to say one half of the cutting edge faces an
opposite direction to that of the other half, so that when the drilling operation is
taking place the whole of the cutting edge effectually acts as a cutter.
When the template is used with a lathe it is secured centrally to the work in any
suitable manner, and revolves therewith and the cutting edge of the drill is passed
through the triangular hole of the template and bears upon the work, while its
other end is supported by the back centre of the lathe by which it is fed forward
during the drilling operation. The drill is prevented from revolving, but is at
liberty to partake of a lateral movement by any suitable means such as a carrier,
dog, hand-vice, or spanner. Thus when the work is revolved the drill will follow
the contour of the triangular hole in the template, and a triangular hole corre-
sponding with that in the template will be reproduced in the work.
When square holes are to be produced I employ a template or disc provided with
a triangular hole similar to that already mentioned, and I mount this template in a
carrier or socket in such a manner as to permit of its being successively turned
through a quarter revolution. The triangular hole occupies such a position in the
template that by successively turning said template through a quarter revolution,
and drilling a hole when the template is in each of its new positions, a square hole
will be produced after the completion of an entire revolution of the template.
When adapting my invention to drilling machines, I may mount the template in
a socket or piece which is fixed to the table of the drilling machine in such a mauner
as to permit of the work passing below it, but instead of revolving the work and
the socket carrying the template, I prefer to make the template a fixture. In this
case the drill would revolve and the drill socket or holder would be so connected to
the spindle of the drilling machine as to enable the drill to partake of the requisite
lateral movement which, according to my invention, is necessary without interfering
with its free revolution.

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1 COMPLETE SPECIFICATION.
Improvements in Drilling Appliances and Attachments.
ADOLPH VIELKIND of 69 St. Dunstan's Road West Kensington Engineer
chereby 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 :-
The object of this invention is to produce angular square or polygonal holes in
metal or other suitable material, by means of attachments to the ordinary lathe or
drilling machine.
The essential features are an excentric chuck for holding the cutting tool, an
adjustable and revolving template, capable of being turned in desired sections in a
carrier, and pierced with an equilateral triangle, and a flat bladed cutter provided
with a double cutting edge.
In the accompanying drawings
Fig. 1 is a plan of the template and carrier, for use with an ordinary lathe.
Fig. 2 is a section of same.
Fig. 3 plan of template and bridge or carrier as used on a drilling machine.
Fig. 4 cross section of same.
Fig. 5 section and elevation (side) of same.
Fig. 6 shews elevation cross section and cutting edge of cutter.
Fig. 7 is plan of cutter head or chuck.
Fig. 8 section of same.
Fig. 9 elevation of same.
A is the template pierced with triangular hole a as arranged to cut a square hole
one inch across, as shown by dotted lines B is the carrier socket or bridge b shews
screws for clamping the carrier on to the work for lathe b¹ shews bolt holes for
fixing bridge to table of drilling machine by bolts 62 cccc are holes in template
two of which engage with pins e on carrier, d d are thumb screws or heads by
means of which the template may be raised off the pins e e are springs fixed on rim
of carrier holding template down C is the cutter to fit the triangle shewn in template
W the work in which the hole is to be cut.
The feature of the invention as embodied in the template can be shewn in
describing it as adapted for drilling a square hole either by the lathe or drilling
machine.
In a circular disc or plate of metal I pierce an equilateral triangle of the proper
size the under edges of the triangle are bevelled, near the edge of the plate I pierce
four holes e equidistant from each other, (the plate instead of being circular. may he
square fitting into a square carrier in which case these holes would not be required)
of which two at one time engage with pins provided on the carrier, the plate is held
firmly in its bed either by springs fixed on the carrier as shewn in Figs. 1 and 2. or
by other suitable means such as a cam or wedge as shewn in Figs. 3 and 5.
The socket carrier or bridge may be of any form suitable to the work and is
provided with a recess to take the template the carrier has also fixed, to it the
means of holding the template in position and is provided with means of fixing it to
the work as shewn in Figs. 1 and 2 or fixing to table in case of the drilling machine
as shewn in Figs. 3. 4. 5 the outer circumference of the templates being uniform
they are interchangeable in the carrier or bridge.
The cutter is an important feature of the invention it is in the form of a flat
blade and is of such dimension as to equal the distance across the triangle from the
apex to centre of base and is provided with a double cutting edge that is to say one
half of the cutting edge faces an opposite direction to that of the other so that when
the drilling operation is taking place the whole of the cutting edge effectually acts
as a cutter.
When working in the lathe the template is securely fastened to the work in any
"

page_text: way that may be necessary or convenient the cutting edge of the drill is passed
through the triangle and bears on the work the other end rests against the back
centre of the lathe and is fed into the work in the ordinary way the cutter is
prevented from revolving by holding it with a hand vice or in any convenient way
that will not prevent the lateral or vibratory motion imparted to it as the template
revolves when a sufficient depth has been drilled the template is turned a quarter
section of its circumference and the drilling repeated and so on till for a square
hole four sections have been turned and drilled when a square hole will have been
cut corresponding in size to the length of the side of the triangle.
The cutter head for using in a drilling machine is shewn at Figs. 7. 8. 9 in this
case as the cutter must revolve as well as have a lateral or vibratory motion I make
the head or chuck in two parts the main is a flat hollow case of circular shape and
is provided centrally with a shank to fit into spindle head of machine the underside
of the case has a circular opening, within the case and freely sliding therein is a
solid plate slightly larger than the opening referred to this plate also has a shank
in which the cutting tool is fixed with a bar passing through it horizontally on the
underside of the hollow case are fixed two pins or studs which engage one on either
side of the bar in cutter shank, these studs when the hollow case receives its motion
from the spindle of the machine serve to rotate the cutter shank and plate in a
similar direction and as the solid is allowed to travel freely in any direction in the
hollow case the bar and studs allow it and the cutter to take the necessary lateral
motion to follow the contour of the template.
The shifting of the template and drilling is similar to that already described the
cutter being fed into the unk in the ordinary way.
case
In Figs. 7. 8. 9 G and G' are the two pieces screwed together to form the hollow
the opening in the lower part permitting the cutter shank to pass through.
H is the solid plate to which the shank his fixed and in which the cutter m is fixed
by set screw m', g' shews the pins or studs which act on the bar i driving or
rotating and the cutter shank in a similar direction.
Templates for holding drills or work in position are not novel and are in common
use and I desire it to be understood that I do not claim the template entirely but
Having fully described and ascertained the nature of my invention and in what
manner it is to be performed I declare that what I claim is
1. The cutting of square or polygonal holes by the use of a template pierced
with a triangle and a flat blade cutter whose width is equal to the altitude of the
triangle each side of which triangle is equal to one side of the desired square or
polygon such template capable of being rotated or moved in sections of a circle
substantially as described and shewn in the accompanying drawings.
2. The combination of such template with a carrier or bridge and a flat blade
cutter (with or without a double cutting edge) of a width equal to that from the
apex to center of the base of the triangle to be cut substantially as described and
shewn.
3. As an auxillary to a drilling machine a tool or cutter head capable of
imparting lateral and rotary motion simultaneously constructed as shewn with
reference to Figs. 7. 8. & 9.
Dated this 27th 1000
ADOLPH VIELKIND.