IMPROVEMENTS IN ROLLING MILLS OR MACHINERY FOR THE PRODUCTION OF SHEET METAL AND FLAT AND OTHER METAL BARS AND ARTICLES
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 ROLLING MILLS OR
MACHINERY FOR THE PRODUCTION OF SHEET METAL AND FLAT AND OTHER
METAL BARS AND ARTICLES." A communication from Louis Eibisch, of
Zaborze, Upper Silesia.
Sealed the 6th February 1880, and dated the 8th August 1879.
PROVISIONAL SPECIFICATION left by the said Gerard Wenzeslaus von
Nawrocki at the Office of the Commissioners of Patents on the 8th August
1879.
GERARD WENZESLAUS VON NAWROCKI, of the Firm of J. Brandt and G. W. v.
Nawrocki, of 124, Leipzigerstrasse, Berlin, Germany, Patent Agent.
"
IMPROVE-
MENTS IN ROLLING MILLS OR MACHINERY FOR THE PRODUCTION OF SHEET METAL
AND FLAT AND OTHER METAL BARS AND ARTICLES." (A communication from
Louis Eibisch, of Zaborze, Upper Silesia.)
The object of these improvements is to manufacture sheet and flat, round, or
otherwise shaped bars or other articles of iron or other metals having in certain
places projections or depressions.
For this purpose one of the rollers in the apparatus is arranged as a drag or loose
roller, and also provided with an appliance whereby it is compelled to resume its
original position after the piece of metal operated on has been passed through. With
this object the gudgeon or shaft of the roller is provided with lever carrying a
counterweight, or springs may be applied.
The modes of application of this apparatus are very numerous, but I will now as
an example aescribe one for the manufacture of shovels. In order to roll them with
rib they must pass through the rolls several times in order to obtain the required
difference in thickness of the rib and the other parts, but that the projection which
the piece has obtained by the first passage through the rolls be not obliterated by
the next passage it is necessary that the piece must enter the rolls at the same part
of the periphery of the rolls.

page_text: The apparatus has three rollers working in frames; the bottom roll is driven by
clutch from the engine, the middle roll is carried along by the bottom roll by
tooth wheel gearing; and the top roll is a drag roll, or unconnected with the others.
The shaft of the bottom roll is prolonged, and drives by pulley and strap a crank
or eccentric press.
The gudgeons of the top roll have levers with counterweight for returning the
roll into its original position; or torsion or other springs may be applied.
The rolls are formed with the required depressions for forming the rib on the
shovels.
The piece of sheet iron of the required length, width, thickness, and weight of
the shovel to be made is first put into the heating furnace; it is then passed between
the lower and middle roll; the attendant on the other side then passes it back
between the top roll and middle roll; when it has passed through, the counterweights
cause the top roll to return into its original position ready to receive the next piece
of iron to be rolled.
The piece is then put into the press and the socket parts formed.
Instead of the upper roll the middle or lower one may be arranged as a loose or
drag roll.

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 7th February 1880.
GERARD WENZESLAUS VON NAWROCKI, of the Firm of J. Brandt and G. W. v.
Nawrocki, of 124, Leipzigerstrasse, Berlin, Germany, Patent Agent. "IMPOVE-
MENTS IN ROLLING MILLS OR MACHINERY FOR THE PRODUCTION OF SHEET METAL
AND FLAT AND OTHER METAL BARS AND ARTICLES." (A communication from Louis
Eibisch, of Zaborze, Upper Silesia.)
The object of these improvements is to manufacture sheets and flat, round, or
otherwise shaped bars and other articles of iron or other metals having in certain
places projections or depressions.
For this purpose one of the rollers in the apparatus is arranged as a drag or
loose roller, and also provided with an appliance whereby it is compelled to resume
its original position after the piece of metal operated on has been passed through.
With this object the gudgeon or shaft of the roller may be provided with lever
carrying a counterweight, or springs may be applied.
The modes of application of this apparatus are very numerous, but I will now
as an example describe one for the manufacture of shovels.
Figure 1 of the accompanying Drawings is a sectional side elevation of a rolling
mill constructed according to this Invention, and Figure 2 a plan of same.
Figure 3 is end view; Figure 4, sectional side elevation; and Figure 7, sectional
end view of a modified arrangement.
Figures 5, 6, 8, 9, 10, and 11 are details, the last four views representing the
shovel blank in its various stages of manufacture.
In order to roll the shovel blanks with rib they must pass through the rolls
several times in order to obtain the required difference in thickness of the rib and
the other parts, but that the projection which the piece has obtained by the first
passage through the rolls be not obliterated by the next passage it is necessary that
the piece must enter the rolls at the same part of the periphery of the rolls.
The apparatus illustrated in Figures 1 and 2 has three rollers A, B, and C
working in frames D; the bottom roll A is driven by clutch from the engine. The
middle roll B is carried along by the bottom roll A by tooth wheel gearing b, and
the top roll C is a drag roll or unconnected with the others. The rolls A and B
make about 50 revolutions per minute.
The gudgeons of the top roll C are held in their bearings by screws d passing
through bushes in the upper part of the framings D, and have levers F with
counterweight for returning the roll C into its original position when it has
performed its work on the blank or piece under treatment; or torsion or other
springs may be applied.
The distance between the bottom roll A and the middle roll B is for the special
case here referred to as an example, about 1/8 inch, and that between the middle roll
B and the top roll C about 1/16 inch.
The rolls are formed with the required depressions for forming the rib on the
shovel, as shown in Figure 1.
The blank or piece of sheet iron of the required length and width, and of a
thickness of about 1/4 inch, and of the weight of the shovel to be made, is first put
into the heating furnace; is is then, when of the proper heat for rolling, passed
between the lower and middle roll, the attendant on the other side then passes it
back between the top roll and middle roll; when it has passed through the two
latter the counterweights cause the top roll C to return into its original position
ready to receive the next piece of iron to be rolled. After the first passage through
the rolls the blank is reduced to about 1/8 inch in thickness, and in its; middle
portion to barely 1/4 inch; after the second passage through the rolls it is reduced
to about 1/8 inch, and in the middle portion to about 3/10 inch.

page_text: The piece which has now assumed the form shown in plan and side view in
Figure 8 is then put into a press and the socket parts ƒ formed. Figure 9 shows
the shovel with the socket flaps f; and Figures 10 and 11 the finished shovel with
the socket formed.
The roll may be brought back into its original position by an arrangement illus-
trated in Figures 3 to 7; Figure 3 being an end view; Figure 4, sectional side
elevation; Figure 7, a sectional end view of the other end of the machine; and
Figures 5 and 6 details.
The gudgeon of the roll A is in this case provided with a spiral spring B, as shown
in Figures 4 and 7, enclosed in and attached to the inside of a casing fixed to the
framing of the machine, so that the upper roll will be dragged on with the blank or
piece passing between it and the middle roll, but will by the spring be forced back
into its original position when the piece has passed through the said rolls. And in
order to fix the roll exactly in that position the gudgeon at the other end of the
roll A, as here shown in Figures 3 and 4, may be fitted with a cam or stop D, which
abuts against a lug on the bearing or the framing; or for the lug may be substi-
tuted any sort of elastic buffer, for instance, as shown in Figure 5.
The same object may be attained by providing one or both gudgeons with a
chain or cord pulley which may be round, or of other form; on its circumference
there is a chain or cord weighted by a weight or spring. In this case a stop or
buffer is also required.
In certain cases the middle or lower roll may be arranged as a loose or drag roll;
or one roll of an ordinary rolling mill may be adapted as a loose or drag roll.
It is evident that, as aforesaid, these improvements also may be applied to rolling
mills for other purposes than the manufacture of shovels, which is only named as
an illustration or example.
And having thus described and ascertained the nature of this Invention, I declare
that I claim,
-
In a rolling mill the use of a drag or louse roll, which by counterweight, spring,
or other means, after each operation returns to its original position substantially as
and for the purpose herein described and shown.
In witness whereof, I, the said Gerard Wenzeslaus von Nawrocki, have here-
unto set my hand and seal, this Third day of February, in the year of our
Lord One thousand eight hundred and eighty.
GERARD WENZESLAUS VON NAWROCKI. (LS.)