IMPROVEMENTS IN THE TURNING OF A com- THREE OR MORE SIDED OBJECTS, AND IN APPARATUS THEREFOR
Year: 1879

page_text: LETTERS PATENT to Gerard Wenzeslaus von Nawrocki; of the Firm of
J. Brandt and G. W. v. Nawrocki, of 124, Leipzigerstrasse, Berlin, Germany,
Patent Agent, for the Invention of "IMPROVEMENTS IN THE TURNING OF
A com-
THREE OR MORE SIDED OBJECTS, AND IN APPARATUS THEREFOR."
munication from Johann Fangel and Ludwig Weisse, both of Berlin,
Cormany
Sealed the 30th April 1880, and dated the 3rd November 1879.
PROVISIONAL SPECIFICATION left by the said Gerard Wenzeslaus von
Nawrocki at the Office of the Commissioners of Patents on the 3rd
November 1879.
GERARD WENZESLAUS VON NAWROCKI, of the Firm of J. Brandt and G. W.
" IMPROVE-
v. Nawrocki, of 124, Leipzigerstrasse, Berlin, Germany, Patent Agent.
MENTS IN THE TURNING OF THREE OR MORE SIDED OBJECTS, AND IN APPARATUS
THEREFOR." (A communication from Johann Fangel and Ludwig Weisse, both of
Berlin, Germany.)
By this Invention it is rendered possible to produce three sided or four sided or
polygonal objects in an ordinary lathe without the assistance of any special whee!
gearing.
According to this Invention the object to be turned is fastened eccentrically to
the lathe centres, and is shifted in position when one side has been turned.
A suitable mode of carrying this Invention into effect is as follows:-
A spindle is placed between the centres of the lathe, and carries two discs, which
are placed in the distance apart required for the object to be held between them,
and which is to be turned. The discs may be of wood or metal, and are so fastened
on the spindle that at least one of them can be shifted along it, so that the object
to be turned can be placed between them; this object is at each end formed with a
three or more sided projecting part fitting in a corresponding recess in each disc.
The form of the projection depends upon the number of sides of the object to be
turned; supposing the object is square, then the projections thereon, and the
recesses in the discs are also square; if the object is three cornered, then the
projections are also three cornered. For many sided objects the projections are of
the same number of sides.

page_text: Supposing the object is intended to be turned square, the square objects or bars
are fastened with their square projections entering the square recesses in the discs,
and between them are placed filling pieces which have steady pins entering recesses
in the disc; a nut on the screwed end of the spindle tightens up the whole, which
can now be turned between the centres of the lathe as required, one side of each of
the four objects or bars is thus finished in the lathe; one of the discs is then moved
so as to permit the four bars to be turned round one half, the opposite side of the
bars is then similarly turned, the surfaces in like manner, then the third and fourth
side of each bar.
While turning the first side of each bar the filling in pieces are turned even
therewith, and these then serve as a guide for the setting and turning of the other
sides, thus doing away with all measuring. Instead of the recesses in the discs
slots may be used, whereby the bars to be turned may be easier put in and taken
out without moving the discs apart.
The so turned surfaces of the bars or objects are not quite flat, but curved,
forming part of a circle; the larger the discs are made, and the more bars can thus
be fixed between them, the less will that curvature be.
These appliances may be used for turning objects of any material. For turning
.different lengths spindles of different lengths are used.
'

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Gerard Wenzeslaus von Nawrocki in the Great Seal Patent Office
on the 3rd May 1880.
"
IMPROVE-
GERARD WENZESLAUS VON NAWROCKI, of the Firm of J. Brandt and G. W.
v. Nawrocki, of 124; Leipzigerstrasse, Berlin, Germany, Patent Agent.
MENTS IN THE TURNING OF THREE OR MORE SIDED OBJECTS, AND IN APPARATUS
THEREFOR." (A communication from Johann Fangel and Ludwig Weisse, both of
Berlin, Germany.)
t
.:
By this Invention it is rendered possible to produce three sided or four sided or
polygonal objects in an ordinary lathe without the assistance of any special whee.
gearing.
According to this Invention the object to be turned is fastened eccentrically to
the lathe centres, and is shifted in position when one side has been turned. .
A suitable mode of carrying this Invention into effect is as follows, and will be
understood by reference to the accompanying Drawings:-Figure 1 a longitudinal
section, and Figure 2 an end view of an arrangement for turning up four bars at a
time. A spindle A is placed between the centres of the lathe, and carries two
discs B, which are placed in the distance apart required for the object to be held
between them, and which is to be turned. The discs may be of wood or metal,
and are so fastened on the spindle that at least one of them can be shifted along it,
so that the object to be turned can be placed between them; this object is at each
end formed with a three or more sided projecting part, say, a four sided part a, as
shown in Figures 1 and 2, fitting in a corresponding recess b in each disc B. The
form of the projection depends upon the number of sides of the object to be turned;
supposing, as here assumed, the object is square, then the projections thereon, and
the recesses b in the disc B are also square; if the object is three cornered then the
projections are also three cornered, as shown dotted in one place in Figure 2. For
many sided objects the projections are of the same number of sides.
Supposing, as illustrated by Figures 1 and 2, the object is intended to be turned
square, the square objects or bars D, say four in number, are fastened with their
square projections entering the square recesses in the discs, and between them are
placed filling pieces E, see Figure 3; these pieces E have steady pins entering
recesses in the discs B; a nut d, Figure 1, on the screwed end of the spindle A
tightens up the whole, which can now be turned between the centres of the lathe,
as required; one side I of each of the four objects or bars is thus finished in the
lathe, one of the discs is then moved so as to permit the four bars to be turned
round one half, the opposite side I, I, of the bars is then similarly turned, as shown
in Figure 4, in like manner, then the third and fourth side of each bar, as shown
in Figures 5 and 6. While turning the first side of each bar the filling in pieces
are turned even therewith, and these then serve as a guide for the setting and
turning of the other sides, thus doing away with all measuring. Instead of recesses
in the discs slots may be used, whereby the bars to be turned may be easier put in
and taken out without moving the discs apart; these slots are shown in dotted
lines at x Figure 2.
The so turned surfaces of the bars or objects are not quite flat, but, as shown on
the Drawing, curved, forming part of a circle; the larger the discs B are made, and
the more bars can thus be fixed between them, the less will that curvature be. In
Figure 7 are shown twelve bars.
These appliances may be used for turning objects of any material. For turning
different lengths spindles A of different lengths are used.

page_text: And having thus described and ascertained the nature of this Invention
communicated to me, I declare that I claim,-
First. The mode of turning objects three or more sided, mainly consisting in that
the object to be turned, together with suitable filling in pieces, is fixed between two
discs, and eccentrically to the centres of a lathe wherein one side is first turned,
the object being then shifted in position, and suitable for turning another side, and
so on, substantially as set forth.
Second. The apparatus for turning objects three or more sided, substantially as
described and shown.
In witness whereof, I, the said Gerard Wenzeslaus von Nawrocki, have here-
unto set my hand and seal, this Thirtieth day of April, in the year of our
Lord One thousand eight hundred and eighty.
GERARD WENZESLAUS VON NAWROCKI. (L.S.)