Improvements in Shearing and Stamping Tools.
Year: 1892

page_text: Date of Application, 22nd Sept., 1892-Accepted, 31st Dec., 1892
COMPLETE SPECIFICATION.
Improvements in Shearing and Stamping Tools.
I, HERMANN SCHURIG, Director of the School of Arts at Offenbach */M. Germany
do hereby declare the nature of this invention and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement :—
My invention relates to improvements in punching machines, by means of which
a piece of sheet metal can be punched through at certain spaces in such a manner
as to present perforations being covered by arched stripes punched out of the metal
and bent through. I attain this object by means of the devices shown on the
annexed drawing and described hereafter.
Figure 1 is the simplest manner of its construction consisting of a pair of plain
stamps working together;
Figure 2 the horizontal and vertical projection of a piece of plate shaped by
the new tool;
Figure 3 is a perspective view of this plate;
Figure 4 shows the corresponding tools in front and side view shaped so as to
serve at the same time for moulding the cut out stripes of plate in a special form ;
Figure 5 is a perspective view of this shape of tool;
Figure 6 shows a piece of work produced by this tool;
Figure 7 is a form of the new tool by means of which the cut out stripes as well
as the side edges are stamped into special moulds;
Figure 8 shows this tool in a perspective view ;
Figure 9 is a view of the work produced by this tool;
Figure 10 is a design of my tool in which the steels are made of roller shape
for the sake of being able to be rolled lengthways upon the plate to be perforated.
The tool shown by Fig. 1 in front and side view consists of the two parts A
and B acting against each other in the direction of the arrows shown, perforating
and shaping the piece of plate or plates Cx put between them. The manner of
aproaching the two pieces A and B to each other depends upon the auxiliary
mechanism to which they are attached.
They may be fixed to a press or stamping machine moving in a straight line, or
to a rotary press, that is to say, to the circumference of a rotating roller or rollers
or wheel, in which case A and B approach each other in a circular movement.
One of the tools may be fixed, the other alone moving towards the first one without
altering the manner of working or the work produced.
The characteristic items of my invention, which are all owned by the different
forms of execution, and shown in Figures 1, 4, 7 and 10 2, 6 and 9 respectively,
are the following: First the shearing action of the comb like steels and secondly
the shaping and moulding of the cut out stripes and thirdly moulding at the same
time the side edges.
The first one is obtained in making each tooth like projection of the tool of
exactly the same width as the space between two teeth of the other corresponding
tool, so that in moving both tools towards each other, their side edges touch each
other and act like the cutting edges of shears. Thus the tooth a of the lower
tool A has exactly the width of the opposite space II in the upper tool B between
the teeth 61, 62 of the latter; 61 is of exactly the same width as the open space III
between the teeth a and a' of the lower tool and so on.
The second action is obtained by making the two corresponding tools act together
like the punch and the corresponding matrice of a stamping machine; the tooth
(punch) in this case receives such a shape which corresponds exactly to the hollow
space of the opposite tool, the matrice or die. This may be a plain arch, as in
Figures 1 and 3, or it may be a more complicated design.

page_text: In Figures 4, 5 and 6 is represented that form of the new tool, by means of
which the cutout stripes at the same time as they are bent out to form an arch in
vertical direction up and down alternately, they are provided with a moulding in
another direction, a channel shape crossways to the length of the stripe in the
example shown.
Thus the tooth e of the lower tool C has again exactly the width of the opposite
space 2 between the teeth d and d¹ in the upper tool D and the tooth d¹ fits exactly
between the two teeth c and of the lower tool C. At the same time however, as
will be seen from Figures 4 and 5 the projecting teeth C, c¹
of
d, d¹
the tools C and D have received a curved shape crossways to the main arch and
of course the spaces 1, 3, 5 and 2, 4, 6 respectively, between the teeth which form
the corresponding matrice or die are shaped accordingly in the bottom, so that
when a plate is first cut out in stripes which are at the same time bent out to form
arches corresponding to the main shape of the teeth, these stripes, when coming to
the bottom of the tool are finally moulded or stamped into the form of the surface
of the teeth.
The third action is obtained by providing the tools E and F at the same time
with side edges H and H¹ being shaped according to a certain design instead of
being straight as in Figures 1 and 4. This form of the tool is shown in Figures 7
and 8 and the work produced therewith is represented by Figure 9. The side
edges H and H of the tools receive corresponding projections and mouldings in
both tools acting together like a punch and its corresponding matrice, in a similar
manner as the projecting teeth and cutting tools, but of course without cutting the
plates through and having a moulding action only.
From Figures 7 and 8 it will be seen that these mouldings in the example shown
are ondulated and therefore the plate produced has besides the double arched
stripes, the corrugated side edges, as shown by Figure 9. Other designs of the
stamping and shearing tools of course give otherwise shaped work.
The stripes can be stretched lengthways when one of the tools is shifted in one
direction so that it glides upon the perforated plate or also by pulling the latter
along underneath the stationary stamping tool. In these cases a tool made accord-
ing to Fig. 10 will be most suitable.
Here the toothlike projections i, i¹, 22 and k, k', k2 are made in shape of little
steel rollers fixed upon spindles L and M upon the bodies I and K and each roller
fits into the corresponding space left in the other tool between its projecting rollers.
In moving these tools to and fro less friction will be caused than with stationary
projections, but otherwise the action of the tools is exactly the same as in the cases
described before.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :
or
A combined shearing and punching tool consisting of two corresponding
stamps (A and B) having toothlike projections a, a¹, a²
b, b1, b2
c, c¹, c²
d, d¹, d² or e, e¹, e²
2
ff, respectively or rollers i, i³,
k, k¹, k³
instead and corresponding depressions I, III, V. II, IV, VI or 1, 3, 5
2, 4, 6.
into which the respective projections fit exactly like the punch and
matrice of a punching machine, when the tools are moved towards each other,
shearing off stripes from a plate put between the tools and moulding the same at
the same time, the alternate projections in each forming the punch for the
corresponding depression or matrice in the other.
Dated this 15th day of December 1892.
H. SCHURIG,
Per Karl J. Mayer,
Agent.