IMPROVEMENTS IN APPARATUS FOR STAMPING OR PRESSING SHEET METAL INTO MOULDS."
Year: 1880

page_text: LETTERS PATENT to August Scherb, of Vienna, in the Austro-Hungarian
Empire, for an Invention of "IMPROVEMENTS IN APPARATUS FOR STAMPING
OR PRESSING SHEET METAL INTO MOULDS."
PROVISIONAL SPECIFICATION left by the said August Scherb at the Office of
the Commissioners of Patents on the 20th July 1880.
AUGUST SCHERB, of Vienna, in the Austro Hungarian Empire.
"IMPROVEMENTS
IN APPARATUS FOR STAMPING OR PRESSING SHEET METAL INTO MOULDS."
The improvements relate to apparatus for manufacturing plates, trays, and
similar articles of sheet metal by means of an ordinary press, said apparatus
consisting of two sets of stamps to be applied successively in the following
manner: The first set of stamps presses from a flat sheet the rough shape of the
product and turns up a rim which is afterwards bent round by the second set of
stamps. The circumference of the lower mould belonging to the first set is made
higher than the central portion (which produces the bottom of the plate), so that
when the flat sheet is laid over the lower mould it does not touch the central
portion of the latter. For the second operation (with the second sets of stamps)
the moulded plate is laid over a mould which fits it exactly, but without surrounding.
the rim turned up by the first set, which rim is exposed to the stamp or upper mould
which converts it into a roll. For this purpose the stamp is hollow to receive the
lower mould and provided with a bevelled mouth, which, when the stamp is pressed
downward, meets the rim of the article to be treated so as to turn the latter
inward and cause it to meet a curved surface which forms the base of the bevelled
mouth and turns the end of the rim downward, thereby converting the rim into a
roll of circular cross section. During the second operation the plate or other article
to be pressed is held fast upon the lower mould by a ring suspended from the
stamp by bolts or other suitable means and pressed downward by springs which
counteract the pressure applied by the stamp. A wire may be laid into the rim
before the second operation if desired. The articles to be stamped may be circular,
oval, or angular in plan, and the pressure is so applied to the stamp as to act
uniformly on all sides.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said August Scherb in the Great Seal Patent Office on the 20th January
1881.
AUGUST SCHERB, of Vienna, in the Austro-Hungarian Empire.
"IMPROVEMENTS
IN APPARATUS FOR STAMPING OR PRESSING SHEET METAL INTO MOULDS."
The stamping appliances illustrated in cross section by the accompanying
Drawings serve for the manufacture of cups, plates, &c., from metal by means of
an ordinary press.
I stamp the cup and raise the flange, Figure 3, in the fore press, Figure 1, by
one operation, and without the formation of folds, after which the flange is turned
back or rolled all round, as shown in Figure 4, either hollow or over a wire core
by means of the finishing press or stamp, Figure 2, again in one operation.
The
The upper part A of the fore press, Figure 1, is carefully fitted into the lower
part B, and so as to leave a uniform space or clearance between the accurately
perpendicular surface 9 of the upper part and the margin of the lower part B,
said clearance corresponding to the thickness of the sheet metal. The margin r of
the lower part B is somewhat higher than the face m, so that a straight piece of
sheet metal placed upon the said margin does not touch the said face m.
down motion of the upper part has first the effect of turning up that part of the
sheet metal which lies beyond the vertical ring surface r, and then to press it down
-between-q-andras soon as the sheet metal encounters a resistance on the face m.
The further motion of the upper part causes the-turned-up. flange which is caught
between 9 and 1 to recede over the rounded edge of the stamp until the said edge
is arrested by the bottom of the matrix (B) and the slicet has assumed the shape
of the stamp.
Because the sheet metal offers the same resistance all round the sheet is stretched
out uniformly in all directions, so that the cup when taken from the fore press,
Figure 3, is quite smooth and even.
The cup is I now placed in the finishing press, Figure 2, the lower part of which
is worked out to correspond exactly to the fore press, so that the cup fits over it
completely, leaving only the turned up flange to project over the matrix.
From
the upper part C is suspended the ring e which is pressed downward by springs
and fits over the cup, holding the latter firmly on the lower part D for the purpose
of preventing a dislocation or change of form of the cup while the flange is turned
over. By the application of pressure on the upper part the tension of the springs
is overcome and the flange of the cup brought in contact with the upper part, the
oblique surfaces of which causes the flange to turn inward obliquely until it
reaches the (annular) groove at the top of s. This groove forces the flange to turn
round and form a roll either over a wire placed inside, or hollow without a wire.
In this manner stamps may be made to produce flanges of various shapes; and
instead of a circle the outlines of the cup or plate to be stamped, &c., may form an
oval, a rectangle, or any other suitable figure. Many shapes, especially the rounded
or oval, allow to dispense with the holding down ring e if the flange is sufficiently
stiff by its shape or bulging to prevent a lateral dislocation or other change of form
of the cup when the margin is rolled.
Claim. The apparatus, substantially as described, for stamping cups, plates, and
similar objects of various shapes from any suitable material, said apparatus having
the following peculiarities:-
a. A flange is first turned up and held fast in such a manner that no folds can
be produced while the raw material is pressed into rough shape.
6. By holding the flange thus fast the sheet is stretched uniformly in all directions
to ensure the perfect regularity of the objects thus stamped.

page_text: c. By one operation or pressure the turned up flange is rolled either hollow or
over a wire core.
.
d. While the flange is turned over or rolled the stamped article is so held down
by a ring or plate that the article cannot change its form during this operation.
In witness whereof, I, the said August Scherb, have hereunto set my hand and
seal, this Fourteenth day of January 1881.