Flip top carton with positive side lock

A lined, flip top style, paperboard carton with an integral hinged cover, that includes a positive side lock arrangement between the carton body and cover on each side of the carton, wherein each of the minor upper inner closure flaps has a first section secured to the inner surface of the major upper outer closure flaps and a second section depending from the first section and having extending there through an opening adapted to receive and retain a tab, projecting outwardly from the upper edge of a carton liner secured to certain of the carton side walls, to maintain the cover in a closed position upon reclosure of the carton cover after initial opening.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
This invention relates to paperboard folding cartons with reclosable hinged 
covers, and, more particularly, to a flip top style carton that includes 
positive side locks between the carton body and cover at both sides, upon 
reclosure of the carton cover. 
2. Description of the Background Art 
A background art search directed to the subject matter of this invention 
conducted in the United States Patent and Trademark Office disclosed the 
following United States Letters Patent: 
______________________________________ 
3,684,159 
3,910,486 4,216,898 
5,040,722 
5,325,989 5,373,960 
______________________________________ 
None of the patents uncovered in the search discloses a lined, flip top 
style, paperboard carton with an integral hinged cover, that includes a 
positive side lock arrangement between the carton body and cover on each 
side of the carton, wherein each of the minor upper inner closure flaps 
has a first section secured to the inner surface of the major upper outer 
closure flaps and a second section depending from the first section and 
having extending there through an opening adapted to receive and retain a 
tab, projecting outwardly from the upper edge of a carton liner secured to 
certain of the carton side walls, to maintain the cover in a closed 
position upon reclosure of the carton cover after initial opening. 
SUMMARY OF THE INVENTION 
It is a primary object of the invention to provide a flip top style 
paperboard carton having a hinged cover with a positive locking 
arrangement on each side of the carton to maintain the cover in a closed 
position upon reclosure after initial opening. 
Another object of the invention is the provision of a carton/cover side 
lock arrangement that is secure and will remain functional for numerous 
carton cover openings and reclosures. 
Yet another object of the invention is to provide a carton/cover side lock 
arrangement wherein little if any changes or modifications are required to 
run the cartons over existing packaging line forming and filling equipment 
currently being used to form and fill similar cartons of conventional 
design. 
A more specific object of the invention is the provision of a positive side 
lock arrangement between a carton body and cover on each side of the 
carton, wherein each of the minor upper inner closure flaps has a first 
section secured to the inner surface of the major upper outer closure 
flaps and a second section depending from the first section and having 
extending there through an opening adapted to receive and retain a tab, 
projecting outwardly from the upper edge of a carton liner secured to 
certain of the carton side walls, to retain the cover in a closed position 
upon reclosure of the carton cover after initial opening. 
These and other objects of the invention will be apparent from an 
examination of the following description and drawings.

It will be understood that, for purposes of clarity, certain elements may 
have been omitted from certain views where they are believed to be 
illustrated to better advantage in other views. 
DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring now to the drawings for a better understanding of the invention, 
it will be seen that the flip top carton body with hinged cover, indicated 
generally at C in FIG. 1, may be formed from the carton blank CB, 
illustrated in FIG. 3; while the liner, indicated generally at L in FIG. 
2, may be formed from the liner blank LB, shown in FIG. 4. 
The relationship of the liner blank LB to the carton blank CB is 
illustrated in FIG. 3A. 
As best seen in FIG. 3 the carton body C includes a first minor side wall 
panel 10, a first major side wall panel 12, a second minor side wall panel 
14 a second major side wall panel 16, and a glue flap 18 which are 
foldably joined to each other along parallel fold lines 13, 15, 17, and 
19, respectively, to form a collapsible tubular structure open at the 
ends. 
Closure of the lower end is accomplished by pairs of opposed lower minor 
inner closure flaps 20 and lower major outer closure flaps 22, which are 
foldably joined to lower end edges of the minor and major side wall panels 
along fold lines 21 and 23, respectively, and which are adhesively secured 
to each other in overlapped relation. 
In a similar manner the upper end of the carton is closed by pairs of 
opposed upper minor inner closure flaps 30 and upper major outer closure 
flaps 32, which are foldably joined to upper end edges of the minor and 
major side wall panels along fold lines 31 and 33, respectively, and which 
are adhesively secured to each other in overlapped relation. 
As best seen in FIGS. 3 and 6A-6C, each upper minor inner closure flap 33 
includes a first section 34, having an outer edge foldably joined on the 
previously mentioned fold line 31 to the upper edge of the related minor 
side wall panel and folded inwardly and adhesively secured to the inner 
surfaces of upper major outer closure flaps 32; a second section 36, 
having an inner edge foldably joined along a fold line 37 to an inner edge 
of first section 34 and folded outwardly and adhesively secured to the 
inner surface of second section 36; and a third section 38, having an 
upper edge foldably joined along a fold line 39a to an outer edge of 
second section 36 and folded downwardly to lie next to the inner surface 
of the adjacent minor side wall panel. 
Third section 38 has, extending transversely from one end of fold line 39a 
to the side edge of third section 38, a cut 39b, the major portion of 
which is spaced a short distance from and extends parallel to fold line 
39a and, which forms in third section 38, a tab receiving opening 39c 
adapted to receive a lock tab 62, as hereinafter described. 
As best seen in FIGS. 2 and 3, carton C includes a reclosable, flip top 
style, hinged cover 40 which is formed by a detachable tear strip 42 
defined by a pair of weakened cut lines 43, in the outer surfaces of the 
front major side wall panel 12 and the minor side wall panels 10 and 14, 
and a narrow strip of plastic tape 46 adhesively secured to the panels 
between the cut lines 43. 
As best seen in FIG. 2, the minor side wall panels 10 and 14 are provided 
with weakened lines of tear 45 that extend diagonally downwardly and 
forwardly from the upper edges of the minor side wall panels to the ends 
of tear strip 42. 
Since it is more practical to lay the plastic tape across the entire width 
of the carton blank, the tape may be cut, as shown at 47, so that only the 
desired part of the tape is functional. 
In order to open the carton, one end of the detachable tear strip 42 is 
grasped and the tear strip removed. At the same time the front and rear 
portions of each minor side wall panel above the tear strip are separated 
to form a reclosable flip top style cover. 
Turning now to FIGS. 3A and 4, it will be seen that liner L includes a 
first glue flap 50, a first minor panel 52, a major panel 54, a second 
minor panel 56, and a second glue flap 58 which are foldably joined to 
each other along parallel fold lines 53, 55, 57, and 59, respectively. 
Each minor panel has an upper section 60 foldably joined to its upper edge 
along a fold line 61. 
Intermediate its ends fold line 61 is interrupted by an elongated C-shaped 
cut 63 that extends into the related minor panel to form therein an 
elongated lock tab 62 that is arranged and disposed to extend outwardly 
from section 60 when section 60 is folded inwardly from its related minor 
panel. 
The function of lock tab is to engage related opening 39c, upon reclosure 
of the cover, to positively lock the cover in a closed position, as 
illustrated in FIGS. 6A-6C. 
Turning now to FIGS. 8-11 of the drawings, it will be seen that a slightly 
modified form of the invention is illustrated. In this second described 
embodiment of the invention, elements corresponding to elements of the 
previously described embodiment have been identified by the same or 
related numerals. 
All of the elements of the second embodiment are the same as those of the 
first embodiment except for the upper minor inner closure flaps and the 
related liner minor panel upper sections and lock tabs. 
As best seen in FIG. 9, each upper minor inner closure flap 130 includes a 
first section 134, having an outer edge foldably joined on fold line 131 
to the upper edge of the related minor side wall panel and folded inwardly 
and adhesively secured to the inner surfaces of upper major outer closure 
flaps 132; a second section 136, having an inner edge foldably joined 
along a fold line 137 to an inner edge of first section 134 and folded 
outwardly and adhesively secured to the inner surface of second section 
136; and a third section 138, having an upper edge foldably joined along a 
fold line 139a to an outer edge of second section 136 and folded 
downwardly to lie next to the inner surface of the adjacent minor side 
wall panel. 
Third section 138 has extending therethrough a generally rectangular lock 
tab receiving opening 139c located intermediate the side edges of flap 132 
and defined by a cut line 139b, portions of which lie on both sides of 
fold line 139a. The purpose of opening 139c is to receive a lock tab. 
As best seen in FIGS. 8 and 10, carton C1, which is formed from blank CB1, 
includes a reclosable, flip top style, hinged cover 140 which is formed in 
exactly the same manner as the cover 40 of the previously described 
embodiment. 
Turning now to FIGS. 9 and 10A, it will be seen that liner L1, formed from 
blank LB, includes a first glue flap 150, a first minor panel 152, a major 
panel 154, a second minor panel 156, and a second glue flap 158 which are 
foldably joined to each other along parallel fold lines 153, 155, 157, and 
159, respectively. Each minor panel has an upper section 160 foldably 
joined to its upper edge along a fold line 161. 
Intermediate its ends fold line 161 is interrupted by an elongated C-shaped 
cut 163 that extends into the related minor panel to form therein an 
elongated lock tab 162 that is arranged and disposed to extend outwardly 
from section 160 when section 160 is folded inwardly from its related 
minor panel. 
The function of the lock tab is to engage related opening 139c, upon 
reclosure of the cover, to lock the cover in a closed position, as shown 
in FIGS. 6A-6C for the prior embodiment. 
Thus, it should be understood that each embodiment of the invention 
provides a flip top carton cover with a positive side lock arrangement 
that is secure and will remain functional for numerous carton cover 
openings and reclosures.