Improvement in Apparatus for Sheet Metal Stamping.
Year: 1893

page_text: Date of Application, 28th June, 1893
Complete Specification Left, 28th Mar-, 1894-Accepted, 28th June, 1894
PROVISIONAL SPECIFICATION.
Improvement in Apparatus for Sheet Metal Stamping.
DANIEL CLARK Sheet Metal Worker 183 Grove Street Deptford S.E. do
hereby declare the nature of this invention to be as follows:-
This invention more particularly relates to the stamping of caps or covers of
lever tins, which have hitherto required two dies and two presses for their
production.
I now propose to combine these two dies on one ted in such a way that the cap
after undergoing the first operation in the first part of the now combined dies,
drops into the second part of the combined dies so that at the next stroke of the
press the second operation is performed at the same time as the first operation is
performed on the following cap thereby completing a cap at each stroke of the
press and saving the use of a press and operator.
June 23rd 1893
DANIEL CLARK.
COMPLETE SPECIFICATION.
Improvement in Apparatus for Sheet Metal Stamping.
C
DANIEL CLARK Sheet Metal Worker 183 Grove Street Deptford, S.E. do
hereby declare the nature of this invention and in what mauner the same is to be
performed, to be particularly described and ascertained in and by the following
statement :-
This invention more particularly relates to the cutting and stamping of caps or
covers for round lever tins, which have hitherto been made in two operations.
Fig. 1. shows the cap in section after the 1st operation.
Fig. 2. shows the same finished.
Fig. 3. shows the dies in section usually used for the first operation.
Fig. 4. shows the dies for second operation.
Fig. 5. shows the dies also in section for the two operations as I now propose to
combine them.
The usual way of making these caps is to fix into an ordinary stamping press the
dies for the first operation, Fig. 3, the top part A. into the upper or moveable part
of the press and the lower part B on to the bottom or bed plate of the press in such
a way that when the blow of the press is given the cutting edge (a. a.) of the upper
die passes against and just inside the cutting edge (d d) of the lower die, and the
inner parts (bb) of the upper die are pressed firmly against the inner parts (e e) of
the lower die.
A sheet of metal usually tinplate is taken and held by the operator in position
between the dies, and the press set in motion the cutting edges (a. a.) (d. d.) cut a
circular blank which is pressed into the shape shown at Fig. 1. by the pressure of the
inner parts of the upper and lower dies (b. b.) (e. e.) and is then thrown out of the
dies, if it has lodged in the lower part by the ring (ff) working on a spring or if
in the upper part by the ring (c c).
It is now taken to another press where the dies for the second operation Fig. 4
are fixed in a similar way to those for the first operation A being the top part
and B the bottom. Here the edges of the cap a. a. Fig. 1 are doubled up and the
cap now finished is thrown out by the plate (9) working on a coiled spring.
Do27

page_text: I now propose to combine the dies for these two operations, so that at each
stroke of one press a cap completely finished may be turned out in exactly the same
time that it has hitherto taken to perform one operation only.
To do this I take the upper part of the die for the first operation and the upper
part of the die for the second operation and combine them on one inclined plate as
shown at A Fig. 5 and I take the lower part of the die for the first operation and
the lower part of the die for the second operation and combine them on one inclined
bed plate as shown at B. Fig. 5.
The upper part of the combined dies is now fixed into the upper part of an
ordinary inclined press and the lower part on to the bed of the press in such a way
that that part of the combined dies which performs the first operation shall be on a
higher level than that part which performs the second operation.
The operator now places the metal sheet as before and sets the press in motion,
the cap then after undergoing the first operation drops down the incline into the
second part of the combined dies so that at the next stroke of the press the
second operation is being performed in the second part at the same time as the first
operation is being performed on the succeeding cap in the first part of the combined
dies, thereby completing a cap at each stroke of the press and saving the use of a
press and the time of an operator.
This inclined combination may be used for two operations as described or for
more whether they be cutting or stamping or cutting and stamping.
It may also be used for different shapes of cuttings and stampings other than
those described.
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
The combination on the incline of the dies for two or more, cutting or stamping,
or cutting and stamping operations.
Dated this 20th day of June 1894.
DANIEL CLARK.