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Патент USA US2122746

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July 5, 1938.
2,122,746
M. P. KERNAHAN
LOCK-TOP CONTAINER
Filed Aug. 24. 1955 '
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INVENTOR
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ATTOR
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‘Patented July 5, 1938; ‘
2,122,746
UNITED‘ STATES
PATENT OFFICE
2,122,746
' LOCK-TOP CONTAINER
Martin P. Kernahan, Phillipsburg, N. 1., assignor
to The Canister Company, Phillipsburg, N. 1.,
a corporation of New Jersey
.
Application August 24, 1935, Serial No. 37,641
6 Claims. (Cl. 229-43)
The invention is an improved lock-top con
tainer having a paper-stock body and a metal
cover adapted to be locked to the body by a turn
ing motion, as by means of an interrupted screw
5 thread connection. Lock-top containers of this
kind are common in the art in which the paper
body is provided with a metal edging or trim on
which are formed 'the inclined ribs or screw
threads to interlock with corresponding ribs on
l0 the metal cover, the interlock being between two.
metallic parts.
,
'
‘The object of this invention is to produce a
similar and equally satisfactory container in
' which the metal trim is eliminated and the cover
.5 attaches direct to the paper. body, thus affording
a substantial saving in manufacturing cost. Pre
vious attempts to produce such low cost lock-top
containers have met with no commercial favor
principally because the wall or rim of the paper
body having the screw thread ribs embossed
thereon could not easily be‘ made rigid enough to
prevent the ribs on the cover from pulling or
riding over them,- thus releasing the interlock.
By this invention this'objection is eliminated and
5 the cover ‘can be attached and removed with
practically the same facility and security as with
a metal-to-metal interlock.
’
By paper as herein used is meant any ordinary
paper-stock or like ?brous material such as com
0 monly'used for making paper cans or containers
chinery, the paper-stock being well sized. or stiff
ened to enable it to retain the shape given to it by
the bossing dies. It is to'be noted that by virtue
of the circumferential separation of the inclined
ribs no two of them are laterally adjacent so i
that the displacement of stock incident to the
embossing of one is not affected by the proximity
of the other, thereby facilitating the formation of
ribs with sharp well bossed contour.
,
The metal cover is formed with a depressed 10
center 3 and a_ circumferential ?ange 4,.the latter
being provided with a curled ?nish-bead 5 along
its edge, and with a number of inwardly em
bossed inclined ribs 6 for screw'thread or inter
locking engagement with the outwardly bossed 15
paper ribs 2. When the cover is applied to the
rim of the paper body and rotated, the metal ribs
ride under the paper ribs and by virtue of their
inclinations draw or lock the cover on the body, in
which position its ?nish-bead 5 bears more or less
on the stop-bead I, and the top of the annular
groove, formed between the flange and the de
pressed part of the cover, seats on the top or cut
edge of the paper rim. This produces a double
seal for the container, one at the bead and .one 25
at the edge, to prevent escape of its contents or
entrance into it of foreign matter. It is not in
dispensable that the cover ‘make simultaneous
contact at both places but it is desirable and such
construction is preferred.
30
and the term “metal cover”, as herein used,
The
annular
wall
1
which
forms
the
inner
wall
comprehends covers made of any similar or hard '
of the annular groove just referred to is specially
material.
I
dimensioned'with relation to the paper body so
The container illustrated in the accompanying that in the application of the cover, it bears
5- drawing will’ su?ice to exemplify the principles snugly against the inner surface of the paper rim
of the invention it being understood that there of the body and thereafter supports it against 35
is no limitation to this particular form except bending
or yielding. inwardly, out of interlock
as required by the claims. In such drawing Fig. ing relation,
thereby resisting the tendency for
1 is a side elevation with cover separated, Fig. 2 ‘the metal, ribs to ride over the paper ribs. For
) a top plan of the container body, Fig. 3 atop plan this purpose the wall 1 is desirably, though not
of'thecovenand Figs..-4 and 5 enlarged longi ‘necessarily, ‘formed with a slight conicity as in 40
tudinal sections atthe interlock. ,
dicated. Fig. 5 illustrates this supporting func
The body of vthe container as shown'is eyliné tion; from which it will be apparent that the paper
‘ dri‘cal. and maybe understood to be formed of
i wound ‘paper-stock as usual and provided with
rib must be ‘virtually crushed-by the ‘metal rib
any'suitable bottom, metal or otherwise as pre- ' before the cover can be pulled on‘, and since the
ferred. ,Its upper end is formed with an out
wardly embossed circumferential stop-bead l and 4
a series, of outwardly embossed inclined ribs 2,
rib is well sized this action is effectually re
sisted.
'
-
The security of the attachment is increased
by treating or coating the surfaces of the ribs,
or more easily the surface'of the whole rim above
the stop-bead, to give it a greater friction coe?l
cient to metal than the paper stock alone would
> above the stop-bead, spaced apart equally around
the circumference, six of such ribs being shown
with the spaces between them somewhat shorter
than their own lengths. The bossing of the stock afford. This can be done in many ways as for
to form the bead and ribs is a well known proc
example by dipping the rim in a lacquer of shel
ess and can be performed in automatic ma
lac in alcohol, or in an enamel, or in fact any
2,122,746
2
kind of surface-coating material which is inex
pensive ancLa non-lubricant, that is to say, upon
the extent that they are individually new they
constituteeparts of this invention usable in other
which the metal ribs will not slide as easily as ' relations as will be evident.
I claim: '
on the bare paper. The increased friction pro
1. A lock-top container comprising a paper
duced in this way does not objectionably or ap
preciably obstruct the rotation of the coveron body and metal cover respectively provided with
the paper because then the ribs move endwise, ' ribs adapted to interlock,vthe cover including a
but it does obstruct the riding of the metal ribs wall of conical shape adapted to engage and sup
over the paper ribs because in that case the metal
10 ribs must move sidewise. Increasing the friction
thus favors security of attachmentlwithout other
wise a?ecting the operation.
'
'
In the ordinary case the metal wall which sup
ports the paper rim against bending or yielding
15 out of interlocking relation with the metal ribs
can be produced most easily by depressing the
center of the cover as commonly done in many
forms of container covers, but so long as its de
scribed function is properly performed, the style
20 or mechanical organization of the cover as well
as the depth, location and shape of the wall it—
self will be seen to be relatively subordinate and
to be determined according to circumstances.
It is a further feature of the invention that the
port the paper rim of the body against bending
away from interlocking relation with the ribs
in the cover.
2. A lock-top container comprising a body and
cover, thebody being wholly of paper and formed
with a series of inclined embossed ribs circum
ferentially spaced apart at intervals around its
rim, the cover being of metal and formed with
mating ribs'to' interlock with the paper ribs and
with an annular wall engaging and supporting '
the inner side of the paper rim when so inter
locked, said paper rim and the ribs thereon being
impregnated with a non-lubricating material pro
viding increased friction to the move‘ment'of the
metal ribs thereoverc
3.: A lock=top container comprising an all
metal ribs or projections on‘the cover are cir.-.
papei.‘ body wall cut from tubular stock. and
cumferentially spaced from each other by short
formed with an embossed stop-bead and a series
and uniform distances because this helps mate
rially in preserving the paper rim from becoming
distorted from true circularity by the force some
30 times applied in screwing on the cover. In this
respect the metal ribs supplement the functions
of the stop-bead, and the support wall‘I. The
number of ribs is subject to variation according
to the body diameter, six being found satisfactory
for body diameters ranging from two to six inches,
being in each case circumferentially spaced from
i‘each other by distances not greater than their
own lengths and not greater than the spaces be
tween the paper ribs. So organized the high ends
40 of the metal ribs will occupy the spacesbetween
the paper, ribs when the cover is screwed ihome
thereby aiding in preserving circularity. This is
indicated by the dotted lirie position of the metal
ribs in
1. It will be seen that in performing
45 this function it is not necessary that each one
of ‘the metal ribs shall interlock with mating pa
per ribs, whichris to say that the purpose of
maintaining circularity can be accomplished. by
-of inclined ribs circumferentially'spaced apart
between said bead and the cut edge, and a cover
having a metal ?ange provided with a finish bead
and with mating ribs to coact with said stop bead
and paper ribs respectively, and having a de
pressed center forming an annular wall for en- ‘
gaging and supporting the cut edge of said body
wall when the cover is screwed home.
'
,4. A lock-top container comprising an all-pa
per body wall cut from tubular stock and having
its rim portion embossed with circumferentially ‘
spaced, inclined ribs and a metal cover formed
with mating ribs to'interlock with said paper
ribs and having a depressed center forming an
annular wall adapted to engage the out edge of
said body wall, said rim- portion being covered
with a non-lubricating coating and said metal
ribs being of greater length than the paper ribs.
5. A lock-top container comprising an all-pa- l
per body wall having :a circular stop-bead em
bossed therein below its out edge and _a series of
inclined ribs embossed above the bead, a ?anged
metal cover having a circular groove to receive
ribs. It is preferred however that all of the said edge and a series of inclined ribs to inter- .
lock with the paper ribs, the cover and body parts
projections be ribs adapted to interlock with cor
being relatively dimensioned so that the bottom
responding paper ribs.
It is likewise important anda collateral fea ' of the groove seats on the cut edge of the body
ture of the invention that the angle of the metal when the ?ange of the cover abuts ‘the stop-bead,
and paper ribs be about 10“_. While lower angles thereby forming a double seal for the container.
6. A lock-top container comprising an all-pa
are permissible within the limits of the inven
tion, it has been found that-an angle of about perv body and a metal cover respectively provided
cover projections that are not ribs or inclined'
this value, in combination with tither features of
the new structure, practically removes all possi
60 bility of driving the metal ribs over'the paper ones
even by the application of excessive screwing-on
force, and at the ‘same ‘time adequately locks the
cover against unscrewing itself.
All of the features above described cooperate
in producing a superior lock-top container but to
with embossed inclined ribs adapted to interlock
by rotary cover motion, the paper body being
embossed with a circular bead below its inclined
ribs and having a friction-increasing coating on
said ribs, and said cover having an annular wall
normally having a bearing contact with the inner
side of the paper rim.
.
MARTIN P. KERNAHAN.
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