AN IMPROVED LATHE FOR TURNING ELLIPTICAL, POLYGONAL, AND OTHER FORMS
Year: 1874

page_text: LETTERS PATENT to Peter Barthel, Engineer and Patent Agent, at
Frankfort-on-the-Maine, Germany, for the Invention of "AN
IMPROVED LATHE FOR TURNING ELLIPTICAL, POLYGONAL, AND OTHER FORMS.”
-
A communication from Richard Koch and Hermann Mueller, in
Dortmund, Prussia.
Scaled the 2nd April 1875, and dated the 19th November 1874.
PROVISIONAL SPECIFICATION left by the said Peter Barthel at the
Office of the Commissioners of Patents, with his Petition, on the
19th November 1874.
I, PETER BARTHEL, Engineer and Patent Agent, at Frankfort-on-the-
Maine, Germany, do hereby declare the nature of the said Invention
for" AN IMPROVED LATHE FOR TURNING ELLIPTICAL, POLYGONAL, AND OTHER
FORMS," a communication, to be as follows:-
The said improved turning lathe is provided with two mandrels, one
turning within the other. A pulley disc, on which the first motion is
Toothed wheels are
transmitted, is fastened upon the exterior mandrel.

page_text: provided for the purpose of imparting the required number of revolutions
to the exterior mandrel. Two of these wheels of the same diameter turn
a countershaft, on which is fastened the third wheel, and the latter
drives the fourth wheel fastened upon the interior mandrel. By having
toothed wheels of different sizes, and changing them as required, the
number of revolutions of the said interior mandrel or shaft may be varied.
Upon the interior mandrel is placed an excentric provided with a disc.
On this excentric is mounted the face plate, to which are fastened the
objects or pieces to be turned; this face plate is moved by a driver or
bolt fastened on the aforesaid exterior mandrel.
This improved lathe operates in the following manner:-Let it be
understood that the fourth toothed wheel has half the diameter of the
second wheel, then the excentric with the interior mandrel turns twice,
and moves the object to be turned twice to and fro. Meantime the
turning tool makes with the face plate only one revolution. The form
of the object or piece turned will be varied according to the eccentricity
of the disc of the excentric.
By changing the aforesaid toothed wheels various forms are obtained,
such as ovals, or three, four, six, or eight sided figures.
The sliding of the aforesaid face plate on the excentric is prevented
by the said disc or plate, which is fastened to the said face plate by a
screw; by giving to the head of this screw the form of a centre punch it
may serve as a support. In turning shafts a second headstock must be
placed on the lathe, having the same construction as that above described,
except that the toothed wheels may be dispensed with. The head of the 2
exterior mandrel serves to secure a wheel, which effects the self-acting of
the support.
"
The chief difference between the construction of this improved lathe
and that of others heretofore used consists in the application of the two
mandrels revolving with different angular velocities, and operating in a
combination with the turning tool, as above described.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Peter Barthel in the Great Seal Patent Office
on the 11th May 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, PETER
BARTHEL, Engineer and Patent Agent, at Frankfort-on-the-Maine,
Germany, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Nineteenth day of November, in the
year of our Lord One thousand eight hundred and seventy-four, in
the thirty-eighth year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto me, the said Peter Barthel, Her special
licence that I, the said Peter Barthel, my executors, administrators.
and assigns, or such others as I, the said Peter Barthel, my executors,
administrators, and assigns, should at any time agree with, and no
3 others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "AN IMPROVED
LATHE FOR TURNING ELLIPTICAL, POLYGONAL, AND OTHER FORMS," a com-
munication to me from Richard Koch and Hermann Mueller; in
Dortmund, Prussia, upon the condition (amongst others) that I, the
said Peter Barthel, my executors or administrators, by an instrument
in writing under or their, or one of their hands and seals, should
particularly describe and ascertain the nature of the said Invention,
and in what manner the same was to be performed, and cause
the same to be filed in the Great Seal Patent Office within six
calendar months next and immediately after the date of the said
Letters Patent.]
:
NOW KNOW VE that T the said Peter Berthel do hereby declare

page_text: 6'
is a rear end elevation of the same.
(
Figure 3 shews a portion of the said lathe detached.
Figure 4 shews various forms which may be produced in the said lathe.
Like letters indicate the same parts throughout the Drawing.
The said universal turning lathe is provided with two mandrils W
and W¹, the second turning within the first. The pulley discs R, on
which the first motion is transmitted, are fastened upon the exterior.
mandril W. The cog wheels 2, 21, 21, 211, are provided for the
purpose of imparting the required number of revolutions to the exterior
mandril W. The two cog wheels Z and Z' of the same diameter turn
the shaft w, on which is fastened the cog wheel Zu; the latter drives
the cog wheel Z¹ fastened upon the interior mandril W¹. By having.
toothed wheels Z", Z, of different sizes, and changing them as required,
the number of revolutions of the said interior mandril or shaft W¹ may.
be varied. Upon the interior mandril W' is placed an eccentric E, on
which is mounted the face plate P. On the latter are fastened the parts
to be turned. The face plate is moved by a driver or set bolt M fastened
on the exterior mandril.
This improved lathe operates in the following manner :-In the
Drawing the cog wheel 2111 has half the diameter of the cog wheel ",
therefore the eccentric with the mandril W¹ turns twice, and moves the
object to be turned twice to and fro; the turning tool during the move-
ment of the latter makes with the face plate only one revolution. The
form of the object or piece turned will be that shewn at 1 or 1*,
Figure 4, according to the eccentricity of the excentrics E.
in
By changing the aforesaid toothed wheels Z" and Z¹¹¹ various forms
are obtained, such as are represented in Figure 4.
The sliding of the face plate P on the excentric E is prevented by the
plate S fastened to P by a screw. By giving to the head of this screw
the form of a centre punch it may serve as a support in turning shafts.
A second headstock must be placed on the lathe having the same con-
struction as that above described. The rollers R and the wheels z, z²,
, and may be dispensed with. The head: V of the mandril W

page_text: serves to secure a wheel not shown in the Drawing; this wheel effects
in a well known manner the self-acting of the rest or support.
The chief difference between the construction of this improved lathe
and that of others heretofore used consists in the application of the two
mandrils W and W₁ revolving with a different angular velocity.
In witness whereof, I, the said Peter Barthel, have hereunto set
my hand and seal, this Seventh day of May, in the year
of our
Lord One thousand eight hundred and seventy-five.
Witness,
LOUIS BASSE.
PETER BARTHEL. (L.S.)