An Improved Appliance for Drilling Square Holes.
Year: 1892

page_text: Date of Application, 18th Oct., 1892
Complete Specification Left, 14th July, 1893-Accepted, 26th Aug., 1893
PROVISIONAL SPECIFICATION.
An Improved Appliance for Drilling Square Holes.
HENRY JENNINGS of 3 Devonshire Villas Upper West Street Ryde in the Isle
of Wight Carriage Painter and WILLIAM JOHN JENNINGS of 3 Devonshire
Villas Upper West Street Ryde aforesaid Whitesmith, do hereby declare the
nature of this invention to be as follows:-
It is an appliance for drilling square holes, and squaring round holes previously
drilled. It consists of a central drill, which when revolving, turns four other drills,
with which it is connected by means of cog-wheels.
The four drills are at right angles with each other, and are for drilling the
corners of the square hole.
With respect to the accompanying drawings,
A, represents a shaft, or spindle, on the bottom of which is fixed a drill, which
when working, will drill out a hole to the dotted line C, C, Fig. 1.
B B B B are four drills with their cutting edges at right angles, so that when
the drill is at work they will cut the corners.
DDDD are the four spindles connecting the four corner drills with four
bevelled cog-wheels E, E, E, E.
FFFF, are the bearings through which, the spindles D D D D work.
GGGG is a square case on which the bearings are cast.
Fig. II. As in Fig. I, A is the shaft.
CICI is the drill which will drill out to the dotted line C, C, in Fig. I.
B, B are the drills to cut out the corners.
D, D the spindles.
EE the bevelled cog-wheels to work the corner drills.
FF the bearings.
G G is the case.
J is a bevelled cog wheel which is not shown in Fig. I, it is fixed on the shaft A,
and is connected with the other four cogwheels.
KK is the cap or cover.
IL is a collar pinned on the shaft A which will pull the pressure on the four
corner drills, when it is applied to the shaft.
M is the hole for lubricating the corner drills.
Fig. II is showing the shape of cap or cover.
Fig. IV shows the shape of the corner drills with the cog-wheel attached.
HENRY JENNINGS.
WILLIAM JOHN JENNINGS.
COMPLETE SPECIFICATION.
An Improved Appliance for Drilling Square Holes.
We HENRY JENNINGS, of 3 Devonshire Villas, Upper West Street, Ryde, in
the Isle of Wight, Carriage Painter, and WILLIAM JOHN JENNINGS, of
3 Devonshire Villas, Upper West Street, Ryde aforesaid, Whitesmith, 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 :-
This invention relates to an apparatus, or appliance, for drilling square holes, or
for squaring previously formed round holes, and it consists of a central drill, which

page_text: when revolving turns four other drills by means of suitable gearing. The said four
drills are in horizontal position, and at right angles to each other, while the central
drill is vertical, so that it will be obvious the four drills form the corners of the
square hole.
Our invention will be fully understood by reference to the accompanying drawing
in which
Fig. 1 is a plan with top cover of drill box removed, and Fig. 2 is an elevation
of our improved appliance.
Similar letters of reference denote corresponding parts in each view.
The spindle A is made with its upper end of the ordinary form of a drilling tool
to suit an ordinary drilling machine. Its lower end receives a suitable drill a
which when working will form a round hole to the size of the dotted line a² shown
at Fig. 1. Keyed or otherwise secured to the spindle A is a bevel wheel C which
gears with four other bevel wheels D, each of the latter being made with or secured
to the shank part e', of a horizontal cutter or drill F, which is preferably milled on
its cutting edge as shown. There are four of these drills F situated at right angles
to each other and they are carried in bearings made in a square box or case G,
which has screwed to its top a cover or cap H arranged with four projecting
corners for the purpose hereinafter described. Above the cover H is fitted a
collar J arranged with a set screw k.
The improved appliance when working operates as follows:
The drill a' drills a round hole to the circumference shown at a² Fig. 1, the four
drills F follow on and form the corners of the square (each cutter F revolving at
right angles in opposite directions to the drill a') therefore the diameter of the
hole a² forms the width of the subsequently formed square a³. The box G works
loosely on the spindle A and the necessary pressure is given to the cutters F by
the fixed collar J. As the cutters or drills F begin to form the corners of the
square hole the projecting corners of the cover / enter the hole thereby steadying
the appliance during the rest of its performance. It will be obvious that the
appliance can be arranged to form three five or more sided figures by simply
employing the number of cutters F corresponding to the number of sides required.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is,
1. In an appliance for forming square holes the combination of a spindle A
having a drill a with four other drills or cutters F carried in bearings or in a box
case or frame G, and revolved by means of bevel wheels C and D or their equivalent
substantially as described and illustrated.
Dated this 13th day of July 1803
H. F. BOUGHTON, M.I. Mech. E.,
Sheffield, Agent.