IMPROVEMENTS IN THE METHOD OF AND APPARATUS FOR ROLLING METAL
Year: 1882

page_text: LETTERS PATENT to Frank Wirth, of the Firm of Wirth and Company,
Patent Solicitors, at Frankfort-on-the-Main, in the Empire of Germany, for
an Invention of "IMPROVEMENTS IN THE METHOD OF AND APPARATUS FOR
ROLLING METAL." A communication froin Louis Röhr, of Hohenlimburg, in
the Empire of Germany
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the Office
of the Commissioners of Patents on the 7th January 1882.
FRANK WIRTH of the Firm of Wirth and Company Patent Solicitors, at
Frankfort on the Main, in the Empire of Germany. " IMPROVEMENTS IN
THE METHOD OF AND APPARATUS FOR ROLLING METAL." A communication
from Louis Röhr of Hohenlimburg in the Empire of Germany.
This Invention has for its object to produce bars or sheets of varying thickness
by means of parallel rollers the distance of which can be varied according to the
thickness of the product.
For this purpose I use a third or press roller in addition to the pair of working
rollers and mount one of the working rollers in open or movable bearings, the
third roller being preferably placed at the top.
The third roller is made excentric or curved according to the variation of the
thickness of the product, so that the largest diameter of the press roller corresponds
to the thinest portion and the smallest diameter to the thickest part of the
product, the movable working roller being constantly in contact with the surface
of the press roller and approaching to or receding from the fixed working roller in
proportion to the eccentricity of the press roller.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Frank Wirth in the Great Seal Patent Office on the 6th July
1882.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at
Frankfort on the Main, in the Empire of Germany. "IMPROVEMENTS IN THE
METHOD OF AND APPARATUS FOR ROLLING METAL." A communication from
Louis Röhr, of Hohenlimburg, in the Empire of Germany.
This Invention has for its object to alter the distance between two circular
rollers (rollers of circular section) while the metallic bar or sheet is being passed
through the pair, in such a manner that the material subjected to the rollers
obtains at different places a different thickness.
In the new arrangement the two working rollers are of circular section and
remain parallel with each other during every revolution, but over the top of the
upper roller is mounted a third roller of excentric or specially designed section,
which running in fixed bearings and turning with the working rollers exerts a
strong pressure on the upper working roller. The latter being mounted in open or
movable bearings and made to approach to or recede from the lower working
roller, according to the radius (distance from the axis of rotation) of the eccentric
roller, at the point where the circumference of the latter touches the upper
working roller.
The accompanying Drawings illustrate the combination of a pair of working
rollers A and B with an adjusting roller C, in whose circumference are fixed two
protecting pieces D D. With this arrangement the roller A approaches twice
towards the roller B during every revolution of the roller C and recedes from the
same twice in the same time, thereby causing the material passed through the pair
of rollers to become thinner in two places than on the rest of its length.
The roller C may be made excentric or any other shape corresponding to the
desired alteration in the thickness of the material to be rolled. Where it seems
advantageous the adjusting-roller may be placed under the press rollers so as to
come in contact with the roller B which, in this case, would be mounted in
movable bearings.
CLAIM.
The combination of a pair of circular rollers A and B (that is rollers with
circular section) with an excentric or otherwise fashioned roller C serving to vary
the distance between the said circular rollers during the passage of the material to
be rolled.
In witness whereof I the said Frank Wirth have hereunto set my hand
and seal this Third day of July A.D. 1882.