IMPROVED APPARATUS AND ARRANGEMENTS FOR SHAPING BOLT OR SCREW HEADS AND NUTS FROM LESS THAN ONE-QUARTER OF AN INCH TO MORE THAN ONE INCH and a Half In DIAMETER
Year: 1875

page_text: LETTERS PATENT to Henry Conradi, of 7, Lower James Street, Golden
Square, in the County of Middlesex, for the Invention of “IMPROVED
APPARATUS AND ARRANGEMENTS FOR SHAPING BOLT OR SCREW HEADS AND
NUTS FROM LESS THAN ONE-QUARTER OF AN INCH TO MORE THAN ONE INCH
and a Half In DIAMETER."—A communication from abroad by Albin
Otto Sack, residing at Cassel, Germany.
PROVISIONAL SPECIFICATION left by the said Henry Conradi at the
Office of the Commissioners of Patents, with his Potition, on the
22nd April 1875.
I, HENRY CONRADI, of 7, Lower James Street, Golden Square, in the
3 County of Middlesex, do hereby declaro the nature of the said Invention
for “IMPROVED APPARATUS AND ARRANGEMENTS FOR SHAPING BOLT OR SCREW
HEADS AND NUTS FROM LESS THAN ONE-QUARTER OF AN INCH TO MORE THAN ONE
INCH AND A HALF IN DIAMETER," to be as follows:-

page_text: screwing machine (Patent No. 2979, September 1874), but also for
general use, consists chiefly in two different shaping arrangements, one
of which serves for working or shaping the face of the bolt heads,
screws, or nuts, while the other is arranged to work or face the sides; in
using it with my Patent screwing machine, cach apparatus can be
fastened directly to the corresponding guide columns, while for general
use it can in a similar way be attached to any machine or placed
anywhere.
The apparatus for shaping the faces of bolt heads, screws, or nuts is
composed mainly of the hollow arm or bracket A, the spindle B, the
tool holder C, and the box-shaped receiver and holder D, fixed upon the
hollow spindle P, in which the bolt heads, screws, or nuts, are fixed by
means of set clamps u. These set clamps are shut or opened in a radial
direction by means of a spiral spring actuated by bevel wheels. In
shaping nuts the box-shaped holder D can be replaced by a mandrel
upon which the nut is screwed, the mandrel being then fixed to the
hollow spindle by a set screw in a similar manner to that employed in
my Patent screwing machine.
If preferred the nuts can be fixed in the holder D, but in this case the
facing or shaping of the sides f has to be accomplished previously, so as
to obtain a correct centering of the nuts. The tool holder O is provided
with several cutters or tools for shaping, say, six in the present case,
three of which shape the faces at right angles to the centre line, while
the thrco others shape the side faces. The cutters are so disposed that
in every set of three each cutter or shaping tool works at a different
angle to the other, so that the first takes off the outer skin, the second
makes the fine cut, while the third makes the finishing cut and gives the
polish. The cutter can casily be fixed in or removed from the holder.
The oil, soapy water, water alone, or other liquid required for lubricating
the cutters or tools, or for similar purposes of the machine, is kept in
the hollow arm or bracket A which serves as a reservoir, while the
cog E conveys the liquid to the cutter or tool holder C, allowing it to
drop in sufficient quantity over the parts, faces, or sides to be worked or
shaped.
The tool box is raised or lowered by the hand wheel F when it is
required to insert a fresh bolt or nut; the latter scrves also to keep it
properly closed when at work. In fixing the bolts it is necessary that

page_text: the bracket A be capable of being turned, and this is effected by
allowing some little play between the bracket and the column, the
former being only fixed tight against the column by the action of the
set screw G, while the small screws act only as holding down bolts.
In order to keep the arm or bracket always in its true position so as
to work properly, its bottom part is provided with a stop J which is
caught by the projecting part of the ring I fixed underneath it, and
firmly attached to the column by the set screws b. This ring serves
as a bearing for the bracket A, which rests on or slides upon it as
required.
The apparatus for working, shaping, or facing the sides of the bolt
heads, screws, or nuts, is also fixed to the column in a similar manner;
its essential parts are the following:-The cross rest N placed trans-
versely, the bearing M placed in a longitudinal position, the main guide
or bracket, the hollow spindle carrying the shaping tool or disc cutter R,
and therefore serving as a tool holder, and the self-acting forward and
backward motion with all its component parts, the arrangement of the
mandrel with its head, the notched wheelf, the worm and worm wheel.
The rest N which is capable of being moved in a direction from the centre
of the column to the centre of the cutter is clongated at both its ends
into two arms, of which the one serves as a guide to the screw spindle c
with its hand wheel d, while the other carries the mandrel head e and
the wheel f. The adjusting screw or spindle c pointed like a centro
punch serves to fix the mandrel m into the conical hollow of its head, so
that it may be guided during working.
D
According to size from 3 to 12 or more nuts can be placed upon the
mandrel at once. Upon the mandrel head is fixed the wheel f which is
provided with notches equidistant from each other, and corresponding in
number to the sides of the bolt heads or screws or nuts, as square,
hexagonal, octagonal, and so on, say, 6 in the present case. This wheel
is kept in the required position by the spring g, so as to ensure that all
sides being cut clean, equal, and true. The thumbscrew serves to
clamp the adjusting screw c. The cylindrical disc cutter R fixed in the
hollow spindle P shapes the sides of the bolt heads, screws, or nuts in
its rotation. The worm k fixed on the hollow spindle gears with the
screw wheels, putting in motion the screw spindlet by means of the
spur wheels z and y.