IMPROVEMENTS IN APPLIANCES TO BE USED IN CUTTING AND BORING HOLES IN METAL
Year: 1884

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I, ROBERT KENT JONES, of 5 Ridley Street, Birkenhead in the county of Chester,
Engineer, do hereby declare the nature of my said invention for IMPROVEMENTS
IN APPLIANCES TO BE USED IN CUTTING AND BORING HOLES IN METAL to be as
follows:-
The invention relates to appliances to be used with drilling or boring machines,
ratchet braces, or like apparatus to hold the cutting tools and feed them forward at
the required speed.
When it is desired to cut a cylindrical hole I make use of a screwed stem around
which there is fitted a sliding block with arms for carrying the cutting tools and a
nut coupled to the block. Any suitable mechanism such as a friction clutch is
used for retarding the motion of the nut and so causing the block and arms to move
along the stem. The cutting tools are secured by means of wedges set screws, or
equivalent devices to the arms, or to adjustable carriers thereon.
The apparatus is used as follows:-The cutters are secured in position and the
stem is attached to the revolving spindle of the drilling or boring machine or like
apparatus say by means of a socket: as the spindle revolves it carries with it the
stein and cutters which latter are fed forward with the block and carrying arm by
means of the nut.
When it is desired to bore taper or conical holes the stein is made in two pieces
jointed by means of a sliding block and groove so that the piece carrying the axis
can be moved excentrically. In this case the nut forms part of the cutter block
and arm and a separate feed screw is used.

page_text: Fig 1 is an elevation, fig 2 a plan, and fig 3 a vertical section of appliances
constructed in accordance with my invention to be used in cutting cylindrical holes
in metal.
.
A central stem is made with a guiding point a. A square slide portion b;
a screwed feed portion c, and a square head or driving portion d. e is a block
provided with arms fand is free to slide on the portion b of the stem. g is a nut
which gears into the screwed portion c of the stem and is coupled to the block e by
the screwed cap h; i jam nut, k sliding blocks on the arms f, for carrying the
cutter 1, m set screws for holding the sliding blocks and cutters in position, n is a
friction clutch fitting around the nut g and adjusted as to grip by the screw and
wing nut o.
In use the point a of the stem is caused to rest on the metal in the centre of the
hole to be cut; a ratchet brace or other appliance suitable for giving rotary motion
to the stem is secured to the said stem at d and is held in position by a suitable
cramp or stand. The arm of the friction clutch is secured to any convenient
stationary object and is tightened by the screw and nut until the required feed is
obtained. Rotary motion is then given to the stem and with it to the arms and
cutters which are caused to travel along the stem by the action of the nut g until
the metal plate is cut through.
Fig 4 is an elevation of apparatus under my invention for boring taper or
conical holes. Fig 5 is an elevation at right angles to fig 4 of part of the apparatus.
Fig 6 is a plan of the apparatus; and tig 7 is a plan of the cutter block and nut.
The central stem is here made in two parts the lower part has the centre point a
and sliding portion b and is fitted with a separate feed screw c instead of having
a screwed portion c. The upper part of the stem is provided with the driving
head d and is connected to the lower portion by the joint q and sliding block and
groove 7' Instead of the upper portion of the stem being made with a driving
head it may form part of a ratchet brace or like appliance, s is a screw and nut

page_text: for moving the sliding block r and with it the lower part of the stem to or from
the centre of rotation so as to adjust the apparatus to bore a parallel or more or
less taper hole. The nut g forms part of the sliding block e which carries the
cutter . The feed screw c is connected by a flexible wire or other joint t to a
spindle and wheels u. v. carried by the upper portion of the stem; the wheel v is
used to give the feed and the wheel u to draw back the cutter by means of the
internally toothed wheel w; or one wheel may be used for both purposes.
The apparatus is used as follows: The point of the stem is caused to rest in the
centre of a piece at one end of the hole to be bored, the upper portion of the stem
fixed to a ratchet brace or like appliance and the whole is adjusted in central
position. The adjusting screws is then turned until the top of the lower portion
of the stem is removed the required distance from the centre. The apparatus is
caused to rotate by means of the said ratchet brace or like appliance. The cutter
block is fed forward and the required taper hole obtained.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is
First. In apparatus for cutting or boring holes in metal the combination of
a central stem, a sliding block and cutters, and a feed nut substantially as set-
forth.
Second. In apparatus for cutting or boring holes the combination of a central
stem with cutter block, nut, cap, and friction clutch substantially as setforth.
Third. In apparatus for cutting or boring holes the combination of a jointed
stem connected by block and groove, with adjusting screw cutter block and nut
and feed screw substantially as setforth.