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Патент USA US3038440

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June 12, 1962
D, KQLTON
3,038,430
METHOD OF MAKING SHEET-METAL PARTS
'
Filed Dec. 50, 1959
FIG. I
FIG. 2
INVENTOR
DAVID KOLTON
BY
ATTORNEY
United grates @atent @?fiee
l
3,938,436
iiatenteri June 12, 1962
2
As illustrated in FIGS. 3 and 4, a series of parts 2% are
stamped out of sheet-metal stock 18. The strips 12 are
spasms
NETHGD 0F MAKENG ?HEET-METAL PARTS
shown disposed within the rings it)‘ in the relative posi
David Koiton, Newark, NJ” assignor to Federal Paci?c
tions they occupy in the stamping operation. There is no
wasted disc within ring 10. However, the width of strip
12 is considerably greater than would normally be avail
2 Claims. (Cl. 113-116)
able at gap 14; and for this reason the edges 14' of ring
The present invention relates to methods of forming
it) are spaced apart much greater during the stamping
metal parts.
operation than would be permissible in the ?nished prod
An object of this invention is to avoid waste in making 10 uct. Either prior to or during the blanking operation, or
parts of sheet-metal and more particularly parts having a
immediately after the blanking operation with the por
split ring having an integral strip extension. An element
tions of ring ill ?xed in the relative positions illustrated,
of this form is used as the electrical terminal connection
dimples 22 are formed in the sheet-metal remote from
for a fuse holder, but it will be apparent that the concepts
edges 14', these dimples being of greater extent at the
involved apply to other products.
15 outside edges of ring 10 than at the inner edges of that
Eiectric Company, a corporation of Delaware
Filed Dec. 30, 1959, Ser. 1 To. 862,333
As will be seen from the description of an illustrative
ring.
embodiment shown in the drawings and described in de
Subsequently, handling parts 2% individually so that the
tail below, the article is stamped from sheet-metal; and
space between edges 14'—14’ is left vacant, dimples 22
at least part of the strip portion extending from the ring
are ?attened. This has the e?ect of closing the wide space
is taken from the sheet-metal stock that would normally 20 between edges 14’ as illustrated in FIG. 3 so that they
be waste, within the ring. In order to do this, the slit in
assume the required spacing in FIG. 1.
the ring is initially made wide enough to provide material
It is evident that the described illustrative embodiment
for the strip portion, even though that width is greater
of this invention is readily adaptable to articles of various
than is permissible in the ?nished article; and portions
shapes, and therefore the invention should be broadly
of the ring are deformed either before or during the blank 25 construed in accordance with its full spirit and scope.
ing operation. Thereafter the deformations are ?attened
Having thus described my invention, what I claim and
causing the over-size width of the opening in the ring to
desire to secure by Letters Patent is:
close to the desired dimension.
l. The method of making an article having a split ring
The nature of the invention will be better appreciated
and a strip extending integrally from the ring from a
from the following detailed description of the illustrative 30 length of sheet-metal stock material, the split in the ring
embodiment shown in the drawings, wherein:
being narrower than the width of the strip, including the
FIG. 1 is the plan view of the sheet-metal article to be
‘steps of blanking and forming the strip and split ring with
formed;
dimples therein, the split in the ring portion being large
FIG. 2 is the side elevation of the article in FIG. 1;
enough to provide material for the strip portion of an
FIG. 3 is the plan view of a continuous series of metal 35 other like article to be blanked from the sheet-metal
blanks as they are related to each other in the blanking
stock, and with the dimples in said ring portion being at
process, the broken lines in FIG. 3 representing marginal
points remote from the edges of the split, the dimples be
edges of a strip of sheet-metal from which the blanked
ing deeper at the outside edges of the ring than at the
parts illustrated are taken; and
inside edges of the ring, and thereafter ?attening the dim
FIG. 4 is an end view of a part in FIG. 3, viewed from
ples to reduce the width of the split to the required size.
the right.
2. The method of making an article having a split ring
Referring now to the drawings, the article in FIGS. 1
provided with an inner and an outer periphery and a
and 2 is seen to include a split-ring It} with a strip 12
strip extending integrally from the outer periphery of the
extending integrally from the ring, this article having a
ring from a length of sheet-metal stock material, the split
slit or gap 14 that is opposite strip portion 12. A hole 16 45 in the ring being narrower than the width of the strip,
is provided in strip 12, screw-threaded as illustrated. The
including the steps of blanking and forming the split ring
ring 10 forms a contact for a fuse in a fuse holder. This
with dimples therein, the split in the ring portion being
ring is to be forced into an opening whose diameter is
large enough to provide material for the strip portion of
less than the ring diameter, and snaps below an overhang
another like article to be blanked from the sheet-metal
so as to be ?xed in position. During this inserting opera 50 stock, and with a plurality of the dimples spaced along
tion, the gap 14 is reduced and the inherent resilience of
the outer periphery of the ring, the dimples being deeper
the ring 16 causes the ring to resume the shape illustrated,
at the outer periphery of the ring than at the inner periph
becoming self-locked in position. The strip 12 is bent to
meet the requirements of the fuse holder.
ery of the ring, and thereafter ?attening the dimples to
reduce the width of the split to the required size.
If such a part were to be stamped from sheet-metal as 55
is readily feasible, the hole left by piercing a disc from
References Cited in the ?le of this patent
ring 1% would represent considerable waste, and the cost
UNITED STATES PATENTS
of this article would be unduly high. In accordance with
the present invention, a method is provided which avoids
Lang ________________aw. Aug. 21, 1945
2,383,135
most of this waste.
‘
6
2,490,864
Engel ________________ __ Dec. 13, 1949
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