IMPROVEMENTS IN THE MANUFACTURE OF CORRUGATED METAL AND IN APPARATUS THEREFOR
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by Gerard Wenzeslaus von Nawrocki at
the Office of the Commissioners of Patents on the 13th April 1883. A com-
munication from Gottfried Kammerich of Berlin, in the Empire of Germany.
GERARD WENZESLAUS VON NAWROCKI, Proprietor of the firm of J. Brandt &
G. W. v. Nawrocki, Patent Solicitor and Civil Engineer of 124 Leipzigerstrasse,
Berlin, Germany "IMPROVEMENTS IN THE MANUFACTURE OF CORRUGATED METAL
AND IN APPARATUS THEREFOR" [a communication from Gottfried Kammerich of
Berlin, in the Empire of Germany]
This invention relates to the manufacture of corrugated sheet metal plates either
cold or hot, by means of rollers and to apparatus therefor.
Various methods have heretofore been adopted for the manufacture of fluted or
corrugated sheet-iron plates but that most generally in use, is by means of straight
dies or rollers.
The sheet-metal bending machines with dies are (when they are to work to
advantage) on the one hand very heavy and large, and expensive as regards the
attendance necessary; and they are on the other hand very complicated.
The sheet-metal bending machines with rollers (or the roller machines) for the
manufacture of flat sheets (Rheinbrohler) are simple, inasmuch as the rollers are
fluted only lengthwise, and engage with one another like toothed wheels. But
they are not applicable for the manufacture of all kinds of corrugated iron plates.
According to the present invention the corrugated sheet-metal plates are made
in the following manner that is to say, the flat sheets are caused to pass through a
rolling mill in which are arranged as many pairs of rollers one behind another as
the number of flutings or corrugations the sheet is required to have. The pairs of
rollers form one after another, two half flutings at a time
Motion is imparted to the rollers by means of belts and pulleys one pulley being
fixed on the same axle as a toothed wheel which engages with another toothed
wheel fixed on the axle of the upper roller of the first pair. This toothed wheel
gears with another toothed wheel fixed on the same axle as the lower roller of the
second pair. The last named toothed wheel gears with another toothed wheel on
the same axle as the upper roller of the third pair and so on. The driving rollers
have all an equal diameter, and consequently also have the toothed wheels so that
the circumferential velocity of all the rollers is the same

page_text: The fluting or corrugation of the plates is effected as follows;-that is to say.
The flat sheet metal plate is placed in front of the first pair of rollers upon a table
tapering towards the rollers; the said plate is bent downwards on either side, and
pushed in through the rollers. The latter draw the sheet through, and form the
first fluting. As it is moved further forward; the two sides that were previously
bent down glide over tongues which are placed between the first and second pairs
of rollers. The position of the said tongues is so arranged, that the parts of the
plate that were bent down are now bent upward so as to be caught by the second
pair of rollers which form on each side a half-fluting or corrugation.
The part of the plate which has passed the second pair of rollers again has its
sides bent down by other tongues so that it can be caught by the third pair of
rollers.
By the third pair of rollers a half-fluting or corrugation is also formed on each
side. The plate is then again bent upwards by a third pair of tongues so that it
can pass through the fourth pair of rollers and so on until the plate is fluted or
corrugated throughout its entire breadth.
The advantages of the improved machine are the following, that is to say ;—The
plates can without interruption be passed in at one side of the machine and come
out at the other without its being necessary to stop, or reverse the motion of the
machine. Sheets of great length can be produced of all shapes and thickness.
Thick plates are worked at a red heat.
By the above described treatment, the pliability or elasticity of the material
only is put to the test, while when a plate is fluted or corrugated by means of
rollers as heretofore constructed stretching cannot be avoided and a cracking of the
plate may easily result therefrom.
The improved rolling apparatus may also be so arranged, that the sheets will not
be fluted from the middle towards both sides, but from one side towards the other.
There must then be double the number of pairs of rollers, as then each pair would
only bend half a fluting. Instead of the aforesaid toothed wheels pulleys can be
employed and any other suitable mechanism may be used for imparting motion to
the rollers.