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Патент USA US3083938

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April 2, 1963
M. c. vols'ssm
3,033,928
cons PLUG
I
Original Filed Jan. 29, 1958
IN VENTOR.
Mme/11v C. VO/J'SEM
MMMYMZ,
A f TORNE Y5
United States Patent
3,083,928
Patented Apr. 2, 1963
1
2
3,083,928
practice of the invention, these notches are intersected
by two diametrically opposite ribs 14, thereby exposing
CURE PLUG
a relatively sharp edge 20 at the end of the rib.
Marvin C. Voissem, Menasha, Wis, assignor to liadger
Plug Company, Appleton, Wis., a corporation of
Wisconsin
Two diametrically opposite sharp edges 20 are suffi
5
Original application Jan. 29, 1958, Ser. No. 711,962, new
Patent No. 2,988,032, dated June 13, 1961. Divided
and this application Nov. 25, 1960, Ser. No. 71,781
cient to anchor the core plug securely in the core but,
if desired, it is possible to cut the blanks 161 on closer
centers than the blank 16 in FIG. 4, this resulting in
forming four notched wall portions and four sharp
terminal edges of the respective ribs which intersect the
notches. FIG. 5 shows the closely coupled blanks 161
and the ?attened margins 17’ which supplement margins
17 to provide the additional anchor terminal edges. Un
3 Claims. (Cl. 242-686)
This invention relates to a core plug.
This application is a division of application 711,962,
?led January 29, 1958, now U.S. Patent 2,988,032,
like the blanks 16 of FIG. 4, which are cut with a con
granted June 13, 1961.
ventional circular die, the blanks 161 of FIG. 5 will
I have discovered that without extra operations, con
require a special die of a form to produce the ?attened
siderable material can be saved, and interlocking en 15 side margins 17’.
gagement of the core plug in a paper roll core can be
Previous attempts to provide an interlock between
secured by stamping the blanks for the core plug from
core plugs and cores have involved extra stamping or
a strip of stock which is narrower than the maximum
forming operations. In addition to the saving of mate
diameter of the blank so that the blank has ?at sides.
rial, the advantage of the present invention lies in the
When the core plug is formed from the blank, ribs are 20 fact that no extra operations are required. The ribs 14
formed in its periphery in areas in which the ribs will
would ordinarily be used in any event. However, even
intersect the notches resulting from the ?attened sides
apart from the ribs, the edges 170, lying within the core,
of the blank. This exposes the ends of such ribs, with
have
very pronounced locking effect since, unlike the
the result that the ribs do not offer more than frictional
rounded
juncture of the side wall with the bottom, these
resistance when the core plug is introduced into the core,
edges are sharp and tend to interlock with the ?ber of
but the interlocking engagement of the ribs with the core
the core.
offers materially increased resistance to withdrawal, thus
I claim:
locking the core plug in place.
1. As a new article of manufacture, a cup-shaped core
The saving in material which is an incidental advan 30 plug
having a bottom wall apertured to receive a mandrel
tage of the method and construction is very signi?cant,
shaft and having a side wall of generally circular con
amounting to 15% to 20% of the total of the metal
tour with a marginal peripheral ?ange about a portion
formerly required.
of its periphery, another portion of the side wall being
In the drawings:
notched
and having a raw edge exposed between portions
FIG. 1 is a view in end elevation of a core plug em 35
of
the
peripheral
?ange, and said last mentioned side wall
bodying the invention.
FIG. 2 is a view of the core plug in side elevation with
portions broken away to the section 2—2 in FIG. 1.
FIG. 3 is a view of the improved core plug in per
spective.
FIG. 4 is a plan view of the strip ‘from which the
blanks are stamped in the practice of the invention.
FIG. 5 diagrammatically illustrates a modi?ed practice
portion having an axially extending outwardly embossed
rib with one terminal end included in the raw edge at
said notch and its other end proximate the bottom wall.
2. The article of claim 1 in which the core plug side
40 wall has a plurality of notches and a plurality of ribs
registered vwith such notches and having raw terminal
edges exposed.
3. As a new article of manufacture, a cup-shaped core
in which the blanks are stamped on such close centers
plug having a bottom wall apertured to receive a mandrel
as to have four ?at sides instead of merely two.
45 shaft and having a side wall of generally circular contour
FIG. 6 is a view similar to FIG. 1 showing the modi?ed
with a marginal radial ?ange about a portion ‘of its
core plug produced by the practice diametrically illus
periphery, another portion of the side wall being notched
trated in FIG. 5.
In general, the core plug is of a ‘well known type
and having a raw edge exposed between portions of the
peripheral ?ange, and said last mentioned side wall por
shown in the expired patent to Brown 1,919,769. It is 50 tion having an axially extending outwardly embossed
a cup-shaped metal member having a bottom wall 10
and a side wall 11 peripherally ?anged at 12. The bot
tom wall has an integral sleeve at 13 which receives the
core shaft or mandrel. The side wall has ribs 14 which
assure a snug ?t of the core plug Within the core.
In accordance with the present invention, the blanks
from which the core plug is formed are cut with a cir
cular die from a strip or web 15 of stock which is
narrower than the over-all diameter of the otherwise cir
cular blank 16 so that each of the blanks has opposed 60
?attened sides at 17 as shown in FIG. 4. When the cup
shaped core plug is formed in a die from the ‘blank 16,
each of the non-circular marginal portions 17 appears
as a notch 170 in the side wall 11.
In the preferred
rib with one terminal end included in the raw edge at
said notch and its other end proximate the bottom wall,
and said side wall being smooth in the area adjacent to
said rib and to the margin of said notch.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,566,788
1,919,769
1,941,495
2,049,334
12,196,378
2,269,939
2,336,161
Clark _______________ __ Dec. 22,
Brown et al. _________ __ July 25,
Schoultheis ___________ __ Jan. 2,
Sobota ______________ __ July 28,
Bebie ________________ __ Apr. 9,
Janisch _____________ __ Jan. 13,
Blanchet _____________ __ Dec. 7,
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