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Патент USA US2106407

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Patented Jan. 25, 1938 v
CAN 'rns'rmo DEVICE
Guy P. Hensley, Gustine, Calif.
Application November 5, 1934, Serial No. 751,632
3 Claims.
(01. 73-51)
My invention relates to a can testing device, . which an arm I18 ofa lever I19 extends.
and particularly to those which are adapted to
test cans with the top covers permanently se
cured to the body of the can and having 'a'cen
5 trally disposed vent _ ‘hole in the top cover.
through which the cans are ?lled with ?uid such
' as milk, oil, tomato juice, and the like.
The lever I19 is adapted to swing about a shaft
NH and the upward movement oi’ the arm I18 is
limited by a stop pin I82. The shaft I6I and the
pin I82 are supported by a lever block I83 which
is supported on the mounting ring I66.
An object of‘my invention is to provide auto
matic means for testing sealed cans and for
10 segregating the unsealed cans from sealed cans.
Other objects and advantages will appear in the
From the foregoing description of various parts
ofthe testing table D, the operation thereof will
be readily understood.
following speci?cation, and the novel features of
the device will beparticularly pointed out in the
cans encounter .an upwardly inclined slide I85
My invention is illustrated in the accompany
Immediately after entering the testing table the
(see Figure 1) with a ?at portion I85’. The slide
' is placed in the path of the cans, whereby the cans : I
ing drawing forming a part of this application, in
other arm I88 of the lever extends upwardly.
are forced upwardly and against the vacuum cups 16
I68. The latter spread outwardly as shown in
Figure 2, and the air con?ned in the cup is forced
'out through the opening I13 and the bushing.
Figure l is a plan view of a can testing table;
Figure 2 is a side elevation of Figure 1, cer
2 O tain parts being shown in section; and
Figure 3 is a cross section of the vacuum cup
used in testing the cans.
A suitable combined feeding and driving means
I58 for the can testing table _D is shown in Figure
NJ 01 1. A guide rail I53 guides the cans 1, that are
to be tested, onto the testing table. The testing
table comprises a gear I68 meshing with the gear
I58 and driven thereby, and a spacing ring I6I
attached to the gear I68 and having pockets I62.
The passing air exhausting from the cup momen
tarily lifts the plunger I 15 upwardly, but the 20
atmospheric pressure immediately thereafter
forces the plunger downwardly, thereby closing
the opening I13 and preventing the passage of air
into the cup through the bore of the bushing.
Therefore, when the cans leave the'?at portion 25
I85’ of the slide I85 they continue to travel in
suspended positions, being so held by the vacuum
cups I 68.‘
The cups I68 are of suf?cient size to cover a
considerable area of the can top, and if it happens 30
that some vent in the cover has not been properly
Spaced from the gear I62 and a?ixed thereto sealed, then air. from the inside of the can begins
by bolts I 65 is amounting ring I66 to the lower ‘to seep into the cup I68. This releases the
face of which a number of vacuum testing cups, vacuum and the cup drops the can, which there
I61 is attached so that the center of 'each cup after continues to travel on the gear I68, until it
coincides with the center line of the corresponding strikes a ?nger I81, and is thereby directed onto
can below.
a belt I88. This belt runs between the guards
The testing vacuum cup I61, see Figure 3, I89 and I98 and delivers the cans to an operator. .
Well sealed cans remain in suspended position,
comprises an inverted cup-shaped member I68
and pass over the ?nger I81, but are dropped
40 having a cylindrical vertical portion I69 integral
therewith. The portion I69 is pressed into a down thereafter by means of a release ?nger I92. 40.’
This ?nger is attached to the guard I98 and ex
bushing I 18 which is screwed into the mount
tends over the ring I66 so that the upstanding
ing ring I66. In this way the cup I61 is'at
arms I88 strike the release ?nger while corre
tached to the ring.
30 The cans enter the pockets I62 and are retained
therein by a guard rail I63.
» The upper portion of the member I68 is pro
vided with a central hole "I into which a bush- .
sponding testing cups I61 pass thereunder. The
arm I88 being struck by the release ?nger I92
ing I12 is inserted. The bore of the bushing
swings in a. clockwise direction,‘ and by means of
communicates with a hole I13 of a small diameter
arranged in the lower portion of the member~sl68
the arm I18 raises the plunger I15.
50 and communicates with the inside. of the cup
shaped member I68. The bushing I12 slidably
carries a plunger I15 which normally closes the
hole I13. The plunger is loosely received in the
bushing so that air .can pass thereby. The
65 plunger I15 has a transverse opening I11 through
by allowed to enter the cup I68.
Air is there- _
The can im
~ mediately drops onto the gear I68, and on its
further forward movement strikes the de?ecting
rail I94 and is thereby guided into a discharging
The checking of the ?lled and sealed cans dis-_
penseswith the old method' of immersing each.
can in water and noting whether any bubbles
escape from the sealed portion, and substitutes
movable with the conveyor, means for raising the
vacuum cups which support the cans. If a can
the can tops and will enclose the sealed part,
leaks, the vacuum cup will release it and this can
is separated from the others and is delivered back
said cups carrying the cans from the can raising
means and supporting them clear of the conveyor,
whereby leaky cans will permit air to enter their
vacuum cups and allow these cans to drop onto
the conveyor, means for removing the leaky cans
from the conveyor, and means for admitting air
to the vacuum cups of the good cans for freeing 10
these cans from the cups.
3. In combination, a conveyor for ?lled cans, a
vacuum cup disposed above each can, and being
movable with the conveyor, means for raising the
to the inspection table. The good cans are sub‘
sequently released from the vacuum cups and are
delivered to the discharge chute.
While I have shown only the preferred form of
10 my invention, it should be understood that vari
ous changes or modi?cations may be made within
the scope of the appended claims without depart
ing from the spirit of the invention.
I claim:
1. A checking device for ?lled and centrally
sealed cans comprising a moving conveyor for
carrying ?lled cans in an upright position, a plu
rality of vacuum cups positioned above the cans
and movable along with the cans, means for mov
20 ing the cans into engagement with the cups for
causing the cups to contact with the can tops
and to enclose the centrally sealed portion, on the
top, whereby the cups will continue to support
the leak-yproof cans above the conveyor and faulty
cans will drop from their cups onto the conveyor,
and means for freeing the leak-proof cans from
their cups and for segregating them from the
faulty. cans.
2. In combination, a conveyor for ?lled cans,
30 a vacuum cup disposed above each can and being
cans so that the vacuum cups will contact with
cans so that the vacuum cups will contact with 15
the can tops and will inclose the sealed part, said
cups carrying the cans from the can raising
means and. supporting them clear of the con
veyor, whereby leaky cans will permit air to enter
their vacuum cups and allow these cans to drop 20
onto the conveyor, means for removing the leaky
cans from the conveyor, the good cans being car
ried beyond said last named means, each vacuum
cup having an air vent, means for normally clos
ing said vent, and means for removing said last
named means from the vent for admitting air to
the vacuum cup of the good can, whereby the
good cans are freed from the cups at a point
removed from the faulty cans.
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