Package having closure assembly with concealed hinge

A package including a container assembly, such as a tube having a dispenser spout, and a closure assembly having a concealed hinge, is provided for use in dispensing a consumer product such as toothpaste or medicinal ointment. The concealed hinge of the closure assembly permits a lid to be opened up to 180.degree. away from an associated closure base to provide maximum access to the container assembly to which the closure assembly is assembled. The closure assembly, including the lid and base, is capable of being molded in a single mold cavity and having maximum ease of opening and closing together with either one or two seals.

This invention relates generally to a package consisting of a closure 
assembly and a container assembly in which the closure assembly has a 
concealed hinge. The invention specifically includes a dispensing type 
closure adapted for use on a container, such as a tube, which includes a 
dispensing spout, the closure being so constructed as to be capable of 
being molded in a closed position and to be opened 180.degree. to thereby 
provide maximum access to its associated container. 
BACKGROUND OF THE INVENTION 
Packages, which for purposes of the following description are defined as 
the combination of a closure assembly and a container assembly (such as a 
tube), are often purchased by the consumer on the basis of the 
convenience, or perceived convenience, of the closure assembly portion 
thereof. As a consequence much development effort has been devoted to 
closure assemblies, the goal being to provide a closure assembly which is 
efficient, easy to use and, most importantly from the manufacturer's point 
of view, economical to produce and assemble to an associated container 
assembly. Particular effort has been directed to packages in which the 
closure assembly includes a dispensing spout since a very large number of 
very different products can be conveniently dispensed from a dispensing 
spout including highly viscous cosmetic fluids and industrial grease of 
very low viscosity. 
All, or at least the very great majority, of current dispensing closures 
are molded in the open position or in two or more pieces. Closures molded 
open must be closed prior to capping. This extra step can be accomplished 
through post-mold closing equipment, or in-mold closing equipment. Either 
step adds cost to the process by requiring extra equipment. In addition, 
in-mold closing requires a longer molding cycle time and therefore a 
higher piece price cost. 
Closures molded in the open position require twice as much tool space as 
closures molded in the closed position. Therefore, for a given tool size, 
a mold can contain twice as many cavities of molded closed closures, 
compared to molded open closures. This reduces the tool cost per cavity. 
In addition, most molded open dispensing closures when capped onto an 
associated container and which require a tamper resistancy feature so as 
to protect against unintentional opening, use shrink wrap or a separate 
box to achieve this additional feature. The shrink wrap or a separate box 
increases the cost of manufacture of the final package in that an extra 
operation, separate and distinct from the molding operation in which the 
closure is formed, is required. And, of course, the cost of acquiring and 
providing equipment for a separate raw material is also required. Included 
in the cost of using a shrink wrap or separate box is the additional 
machine time necessary to apply a wrap or enclose the component within a 
box. 
Most, if not all, conventional dispensing closures with living hinges have 
non-uniform peripheries due to hinge protrusions. As a consequence, the 
protruding hinge tends to cause interference during the assembly and 
handling phases of production. When the closures are fed to the capping 
equipment, for example, preparatory to being secured to a tube, the 
peripherally outwardly extending protrusions can be the cause of jam-ups 
in the closure feeding mechanism and consequent line down time while the 
jammed closures are freed and the feed line restarted. In addition, 
closures with protrusions are often not well adapted for inverted 
packaging and can be of concern with respect to consumer handling safety. 
In addition, many dispensing closures are fastened to their associated 
package by threads. Threads require torquing type capping equipment which, 
on occasion, results in packages with non-oriented closures. Although such 
a filled tube may, from a technical standpoint, operate substantially as 
efficiently as one having the desired dead center alignment, as a 
practical matter the consumer tends to avoid purchasing such an out of 
alignment product, often on the assumption that there is something "wrong" 
with the product. In addition, torque type capping equipment is more 
costly than other types of capping equipment such as snap-on type capping 
equipment. Even the molds for screw-on type closures are more expensive 
than, for example, snap-on closures since screw-on molds usually require 
an unscrewing core or a collapsible core and, in general, are more complex 
and expensive than snap-on closure molds. 
A further drawback with many current closures is that such closures almost 
invariably have a protruding tab in order to enable a user to quickly and 
conveniently locate the "handle" formed by the tab for easy opening and 
closing of the product. When a protruding tab extends outwardly beyond the 
outer diameter of the base of the closure, interference in the capping 
process and in the automatic handling of the closure can occur. 
Raised orifice spouts are an advantage to the consumer because of their 
distance from the conventional deck of the closure. An orifice flush with 
the deck of the closure can be harder to clean than a raised orifice, and 
a raised orifice spout gives the consumer a greater angled view to the 
orifice than a flush orifice. Thus a dispensing closure which will 
accommodate raised orifices of substantial heights is a distinct advantage 
over a package which includes a flush orifice. 
It is also important that the spout access area be as large as possible. 
This is particularly important in closures in which the hinge structure is 
located within the periphery of the closure. It will be understood that in 
a closure in which the hinge structure is located within the periphery of 
the closure; that is, no part of the hinge member protrudes outwardly 
beyond the periphery of the lid, a portion of the lid area must 
necessarily be dedicated to the hinge structure. In this invention the lid 
area which is necessarily dedicated to the hinge mechanism is made very 
small and as close to the periphery of the lid as possible to thereby 
provide the maximum possible access area to the spout. A further 
requirement is that the lid be easy to flip open and close since such 
containers are intended, primarily, for the consumer market. Further, the 
lid should be easily opened and closed to quickly present the spout, and 
the spout area, to the user in the sense of no binding engagement, or 
interference, of the parts which come in contact with one another during 
the opening and closing movements. 
In addition, a raised spout also makes possible the application of a foil 
"freshness" seal applied to the top of the spout. Such a seal provides a 
measure of tamper resistancy, as well as retaining the integrity of seal 
of the package and thus the freshness (moisture and oxygen barrier) of the 
product. 
It is also desirable that the closure be capable of providing a single seal 
or a double seal of the spout. It will be understood that a double seal 
may be highly desirable when the container with which the closure is 
associated holds and dispenses liquids of high viscosity. 
It is also highly desirable that the closure be capable of be capable of 
being positively and audibly locked when not in a dispensing condition so 
that the user is informed that the closure is fully closed and the sealing 
means made operative. 
And finally, all, or nearly all, conventional closures include, as a 
necessary feature, a closure deck. Such a deck requires a substantial 
quantity of material which, since most such closures are manufactured from 
good quality resins, comprises a significant item of cost. 
SUMMARY OF THE INVENTION 
The invention includes (i) a concealed hinge dispensing closure which can 
be molded in a closed position, (ii) a tamper resistancy feature which is 
added in the molding process, (iii) has a lid with a lifting and closing 
tab which does not extend beyond the periphery of the closure, (iv) is 
assembleable to a dispensing container by a snap-on process, (v) is of any 
desired height so as to be usable with a container having a dispensing 
spout of substantial height, (vi) has a spout access area of maximum or 
near maximum area permissible with a hinge mechanism located within the 
periphery of the lid, (vii) has a lid which is easily flipped open and 
closed by the user, (viii) is adaptable to both single seal and double 
seal containers, (ix) does not bind during opening or closing regardless 
of whether a foil seal system, a peripheral sealing system or a single or 
dual plug seal system comprises the sealing means, (x) be capable of being 
positively locked when not in use, and (xi) does not require a closure 
deck in any of its iterations. As a consequence, the molding costs of the 
closure are lower than conventional closures because a mold can contain 
twice as many closure cavities as a molded open closure mold, and the 
cycle time is less. Safety tabs can be formed during the molding process 
thereby eliminating later, and more costly, applications of shrink wraps 
and cardboard, with a consequent decrease in excess packaging which must 
be thrown away upon initial use. 
Further, the closure, due to a uniform periphery wherein neither hinges nor 
open-close tabs protrude beyond the periphery, is well adapted to be used 
in automatic assembly and handling equipment, and, since the closure may 
be snapped onto an associated container, the less costly snap-on type 
capping equipment can be used. 
A distinct advantage over many conventional closure systems is that the 
present design permits the deck and spout of the conventional closure to 
be transferred, in effect, to the tube head thus greatly simplifying the 
design of the closure and reducing its cost, possibly without a 
significant increase in the cost of the tube. And since the closure does 
not contain a closure deck, less material is required in the closure than 
in similar type closures. Even though no closure deck is used, the closure 
can be of substantial height so that the container can include a raised 
orifice spout of any desired height.

DESCRIPTION OF SPECIFIC EMBODIMENT 
Like reference numerals will be used to refer to like or similar parts from 
Figure to Figure in the following description of the drawing. 
Referring to FIG. 1 a package is indicated at 10, the package consisting of 
a container assembly, indicated generally at 11, and a closure assembly, 
indicated generally at 12. It will be understood that the product 
contained within the container assembly 11 may vary widely from automotive 
grease to medicinal ointments. For convenience of description, it will be 
assumed that a typical consumer product, such as toothpaste, is the 
product to be stored and dispensed at the will of a user. It should be 
understood, however, that reference to toothpaste is for convenience only 
and is not to be taken as limiting the scope of the invention. The 
container assembly 11 includes, in this instance, a tube structure 13 
which is closed at one end, as by crimping. The closure assembly 12 
includes a closure base, indicated generally at 16, and a closure lid, 
indicated generally at 17. A lift tab, which is part of the closure lid, 
is indicated at 18, and a hinge assembly which connects the lid to the 
base is indicated at 19. 
Referring now to FIG. 2 the closure assembly 12 is shown exploded away from 
the container assembly 11. The tube structure 13 includes an inwardly and 
upwardly inclined lower transition section 20, a top section 21 whose 
outer diameter is sized to be received within the closure base 16 as will 
be described in detail hereinafter, an upper inwardly and upwardly 
inclined transition section 22, and a tube deck 23 from which a pouring or 
dispensing spout structure, indicated generally at 24, extends upwardly. 
The top section 21, transition section 22 and tube deck 23 are all known 
as the "neck finish" and that term will be used from time-to-time 
hereinafter. The spout structure includes a neck portion 26 which has an 
eye-pleasing upwardly curved contour, a peripheral bead 27 and, in this 
instance, a conventional foil safety seal 28. It will be noted that the 
tube deck 23 side walls overhang the upper surface of the upper transition 
section 22 to form an annular indentation 29 or indent ring for a purpose 
which will appear hereinafter. 
Referring now to FIG. 5 the relationship of the closure assembly 12 to the 
container assembly 11, and specifically the upper end portion of the 
container assembly 11, is illustrated in greater detail. 
The closure lid 17 includes a central, generally circular top plate 32 (see 
also FIG. 6) which moves from the closed position of FIGS. 5 and 6 to the 
fully opened position of FIG. 15, as will be described hereinafter. The 
lift tab 18 is integral with top plate 32. The top plate 32 is connected 
by the hinge assembly 19, which includes hinge plates 33, 34, see FIG. 6 
also, to hinge base 35 which in turn is an integral horizontal extension 
of a vertical extension 36 from the enclosed circular base wall 37, see 
also FIGS. 3, 4, 6 and 8. The lid and hinge base form a top disposed on 
the closure base. A reinforcement wall 38 located forwardly of hinge 
assembly 19 projects downwardly from top plate 32. Wall 38 is cut away as 
at 39, see FIGS. 4, 5 8 and 10, so as not to interfere with spout 
structure 24. A lid skirt, which extends approximately 300.degree. about 
the circumference of the top plate 32 is indicated at 41, see FIGS. 5, 7, 
8 and 12. 
Fastener means for ensuring that the closure lid 17 remains secured to the 
tube spout 24 is indicated generally at 42 in FIGS. 5 and 11. The fastener 
means includes a downwardly projecting circular flange 43 which has an 
internal bead 44 encircling its lower, inner end. The bead 44 has a curved 
contour 45 on its lower side so that it will easily cam past the 
peripheral bead 27 on the spout structure 24 and engage the underside of 
bead 27 to secure the closure lid to the spout structure 24. A circular 
downwardly pointed seal ring 46 engages the exposed upper rim surface of 
the neck portion 26 of the spout after the safety seal 28 has been removed 
to seal the contents of the tube assembly from ambient atmosphere after 
the first use by the user, and the removal of the foil seal 28. 
The means for securing the closure assembly 12 to the container assembly 11 
is illustrated best in FIGS. 2, 5, 7, 8, 10 and 15. Referring first to 
FIG. 15, the inner edge of the base wall 37 is chamfered as at 48 so that 
when the container assembly 11 and the closure assembly 12 are brought 
into engagement for securement to one and other, the base wall 37 will 
contact the upper outer edge 47, see FIG. 2, of the tube deck 23 as the 
closure assembly moves to its fully engaged position of FIGS. 5 and 15. 
Referring now to FIGS. 5, 7, 8 and 10, and to FIG. 8 initially, two of four 
snap-on lugs are indicated at 49, 50. For purposes of illustration a lug 
is indicated in FIG. 15 on the right side of the package. Each lug 
consists of an upper inclined surface 51, see FIG. 7, which could be flat 
but, as shown, is preferably inclined slightly downwardly and inwardly, a 
vertical surface 52, and a lower downwardly and outwardly inclined surface 
53, the three surfaces forming a projection which is snugly received in 
the area 29 whose cross section is generally triangularly shaped as shown 
in FIGS. 5 and 15. It will be noted that the slant of the lower surface 53 
matches the slant of the transition section 22 of the container assembly 
11, and the upper surface 51 fits slightly under the overhanging edge of 
the tube deck 23. The upper slanted surface 51 makes possible the removal 
of the closure assembly 12 from the container assembly 11 with the 
application of sufficient force exerted between the lower edge of base 
wall 37 and the lower transition section 20. If the contained product is 
tooth paste and hence there is little or no foreseeable need to 
disassemble the closure assembly from the container assembly during the 
normal life of the package, the upper surface 51 could be flat, though 
mold design considerations could still indicate the use of the illustrated 
slanted configuration. 
The unique means for molding the package in a closed position is 
illustrated best in FIGS. 6, 7, 12, 13 and 14. 
Referring first to FIG. 7, a tamper resistant member which joins the 
closure lid 17 to the closure base 16 is indicated generally at 56. The 
tamper resistant feature is a tab which is formed integrally with base 
wall 37 as best seen in FIGS. 7 and 14. The tamper resistant tab includes 
a base section 57 which terminates in a thin strap 58 which joins the 
lower outer edge of lid skirt 41 to base wall 37. The strap 58 may, for 
example, be on the order of only about 0.006" in thickness and hence it 
forms a line of weakness which can be readily ruptured by the application 
of upwardly directed thumb pressure on lift tab 18, yet the tamper 
resistant tab, of which two are shown in this instance, are sufficiently 
strong to maintain the closure base 16 and the top plate 32 and its 
depending lid skirt 41 in the position of FIG. 7 during molding including 
ejection, and subsequent handling and capping steps. It will be understood 
that since the top plate 32 is oriented relative to base wall 37 as shown 
in FIG. 6, engagement pressure for pushing the closure assembly 12 onto 
the container assembly 11 may be exerted on the upper exposed surface 
portions 54, 55 of base wall 37, see FIG. 5, and thus little pressure will 
be exerted on closure lid 17 which would be transmitted to the thin straps 
58. As a result, the integrity of the straps 58 is maintained until the 
user, such as a consumer, prepares to use the package for the first time. 
The unique concealed hinge feature of this invention is illustrated best in 
FIGS. 1, 5, 6, 8-10, 12, 14 and 15. 
Referring first to FIG. 9, which is a detailed view of the hinge portion of 
FIG. 8, but to a larger scale, it will be seen that the upper surface of 
left hinge plate 33 is flush with the top surface of top plate 32 so that 
a smooth, aesthetically pleasing appearance is presented to the eye. Since 
hinge plates 33 and 34 are identical, only hinge plate 33 will be 
described. This can also be seen from FIGS. 1 and 6. The hinge plate 33 
includes a rear portion 60 and a front portion 61, the two portions 
tapering upwardly at the mid-portion of the hinge plate to define a bend 
line area 62. It will be understood that the material to the left of bend 
line area 62 in FIGS. 6 and 8 is integral with, and forms a portion of, 
hinge base 35, and the material to the right of bend line area 62 is 
integral with, and forms a portion of, top plate 32. 
The hinge assembly 19 includes a U shaped hinge 64 whose rear leg 65 
terminates in a thin strap 66 which in turn is integral with depending 
rear base member 67 which is integral with hinge base 35. The front leg 68 
of hinge assembly 19 terminates in a thin strap 69 which in turn is 
integral with the depending front base member 70 which is integral with 
the top plate 32. The left end and right end portions of hinge 64 are 
preferably cut away as at 71, 72, see FIGS. 6 and 12, to relieve any 
tendency for the hinge assembly to bind as it moves from a fully closed to 
a fully opened position, and back again. 
The closure assembly 12 is illustrated in a fully closed position in FIGS. 
5, 8, 9 and 12. This is the position in which the closure assembly is 
molded and snapped onto container assembly 11 prior to the first use of 
the package. 
In FIGS. 14 and 15, the package has come into the hands of a consumer and 
it is shown in operation during the first use. In FIG. 14, the user has 
exerted upward pressure on lift tab 18, usually by a thumb or a finger, or 
both, and the thin straps 58 of FIG. 7 which held the closure lid 17 
spaced from the closure base 16 have been broken so that there is no 
external restraint to movement of one with respect to the other. The lid 
17 is shown in a 90.degree. or half open position in FIG. 14. In this 
position the hinge 64 has been flattened in contour and the hinge straps 
66 and 69, as well as the hinge 64, are under considerable tension. By the 
same token, the material in the bend line area 62 has been partially 
extended. It will be understood, however, that since the material from 
which the closure assembly 12 is made is preferably a thermoplastic 
material such a polypropylene, and since the bend line area may be on the 
order of about 0.011" in thickness, the degree of deformation represented 
by the half open position of the FIG. 14 may be easily attained. 
In FIG. 15, the closure 17 is in the 180.degree. or fully opened position. 
In this condition the rear and front straps 66 and 69 of the hinge have 
had the tension represented by FIG. 14 relieved, and these straps are 
therefore under no tension. However, bend line area 62 is at maximum 
extension and tension but, as indicated in FIG. 15, the tension in bend 
line area 62 and straps 66 and 69 which tends to urge the closure 17 back 
to the position of FIG. 8 is insufficient to overcome the counterpressure 
of hinge 64 which tends to remain in its as molded position of FIG. 9. As 
a consequence, the closure 17 remains in a 180.degree., fully open 
position thereby providing maximum access, during use, to the spout 26. 
It will be noted in FIGS. 5 and 15 that the container assembly 11 is shown 
in its condition as manufactured and up to the moment before the user 
seeks initial access to the contents of tube structure 13. In this 
position the foil safety seal 28 remains intact and hence the user can 
tell at a glance prior to first use whether the package 10 has been 
tampered with to the extent that the contents of tube structure 13 has 
been accessed. During the first use, the user will, of course, remove the 
foil safety seal 28 in any appropriate manner, such as by breaking with a 
finger and tearing around the periphery or lifting off by a suitable tab 
which is integral with the seal. 
Referring now to the alternative embodiment of FIGS. 16-27 a package is 
indicated generally at 70, the package consisting of a container assembly, 
indicated generally at 71, and a closure assembly, indicated generally at 
72. It will be understood that the product contained within the container 
assembly 71 may vary widely in characteristics and viscosity. For 
convenience of description it will be assumed that a typical consumer 
product, such as a cosmetic liquid of high viscosity, is the product to be 
stored and dispensed at the will of a user. It should be understood 
however that reference to a highly viscous cosmetic fluid is for 
convenience only and is not to be taken as limiting the scope of the 
invention; the container assembly could just as well contain automotive 
axle grease of very low viscosity. The container assembly includes, in 
this instance, a tube structure 73 which is closed at one end, as by 
crimping. The closure assembly 72 includes a closure base, indicated 
generally at 76, and a closure lid, indicated generally at 77. A lift tab, 
which is formed integrally with the closure lid 77, is indicated at 78, 
and a hinge assembly which connects the lid to the base is indicated at 
79. 
Referring now to FIGS. 16 and 21, and particularly to FIG. 21, the tube 
structure 73 includes a barrel portion 74, an upwardly and inwardly 
inclined transition section 80, another upwardly and inwardly inclined 
transition section 75, and a top section 81 whose outer diameter is sized 
to be received within the closure base 76 as will be described in detail 
hereinafter. A lid locking flange is indicated generally at 82, the 
locking flange having, in this instance, a substantially planar upper 
surface which is inclined radially inwardly and downwardly from its 
periphery to provide an undercut or locking ring 83 which, in this 
instance, extends around the entire periphery of the locking flange. 
Although the locking flange is here illustrated as circular in 
configuration it will be understood that its configuration is not so 
limited, and any suitable configuration may be employed although a 
circular configuration minimizes binding during locking and unlocking of 
the lid from the locking flange. 
A pouring or dispensing spout is indicated generally at 84 extending 
upwardly from the locking flange. The spout 84 includes a neck portion 86 
which has an eye pleasing, upwardly curved contour and terminates, in this 
instance, in a top plate, 87 having a centrally located, circular 
dispensing aperture 88. 
The closure lid 77 includes a central generally circular top plate 92 which 
moves from the closed position of FIGS. 16-18, 20, 21, 23 and 25 to a 
fully open position represented generally by FIG. 15 of the first 
embodiment. The lift tab 78 is integral with top plate 92 and, as will be 
noted from FIGS. 17, 19 20 and 21, does not extend beyond the external 
periphery of the closure assembly, though it could if desired or required. 
The top plate 92 is connected by the hinge assembly 79, which includes 
hinge plates 93, 94, to hinge base 95 which in turn is an integral 
horizontal extension of a vertical extension 96 from the circular base 
wall 97. The lid and hinge base form a top disposed on the closure base. A 
lid skirt, which extends approximately 240.degree. about the circumference 
of the top plate 92, is indicated at 101. 
Locking means for ensuring that the closure lid 77 remains secured to the 
tube spout 84 is indicated at 102 in FIGS. 21 and 26. The locking means is 
a bead which is dimensioned to fit in the locking ring 83 formed beneath 
the lid locking flange 82. Preferably the locking bead 102 extends about 
180.degree. around the front of the circular base wall 97, though the 
actual extent may be lesser or greater. Preferably the length of the 
locking bead should not be so great as to cause a binding action between 
the bead and the locking flange 82 during locking and unlocking, and yet 
be of sufficient length so as to ensure that the two parts grip one 
another firmly. 
A double seal system for ensuring fluid tight engagement between the 
closure lid 17 and the dispensing spout 84 is illustrated in FIGS. 21 and 
23-25. The first seal consists of a circular plug 103 which projects 
downwardly from the underside of top plate 92 and in alignment with the 
dispensing aperture 88 of the top plate. As best seen in FIG. 24, the 
lower circular end of the wall of plug 103 is tapered inwardly as at 104 
in order to enable the plug 103 to cam past the upper corner of aperture 
88 when the lid 77 is rotated in a downward, closing and sealing 
direction. The second seal consists of a circular ring 105 which projects 
downwardly from the underside of top plate 92 radially outwardly from plug 
103, the ring 105 and that portion of the lid lying within it forming in 
effect a solid wall, closed bottom receptacle. The ring 105 is so 
dimensioned that its inner wall 106, see FIG. 23, slides along the 
exterior surface of the vertically upwardly extending portion of spout 84, 
said upwardly extending portion forming, in effect, a spud. As best seen 
in FIGS. 23 and 25, the lower circular inner wall end portion of ring 105 
is tapered radially outwardly at 107 in order to enable the ring 105 to 
cam past the upper outer corner of the neck portion 86 of the spout when 
the lid 77 is rotated in a downward closing and sealing direction. It will 
be appreciated that the tapered surfaces 104 and 107 on the plug and ring 
ensure that there will be no undesirable binding between the lid and the 
spout when the lid is rotated downwardly into sealing engagement with the 
pouring spout. It will be noted that the double seal system is a seal 
within a seal system; that is, one seal completely surrounds and protects 
the other seal. 
Means for ensuring that there will be no binding between the lid and the 
spout when the lid is moved toward a container open position of FIGS. 14 
or 15 are also shown in FIGS. 21, 23 and 25, said means comprising 
decreasing the length of the lower end portion of ring 105 in a direction 
toward the hinge assembly 79. The full extent of the decrease in length is 
seen from a careful inspection of FIG. 21; it is more readily seen as 
represented by the bottom edge contour 108 in FIGS. 23 and 25. 
Referring now to FIGS. 23 and 25, three of four snap-on lugs are indicated 
generally at 99, 109 and 110. Each snap-on lug consists of an upper 
inclined surface 111, which could be flat but, as shown, is preferably 
inclined slightly downwardly and inwardly, a vertical surface 112, and a 
lower downwardly and outwardly inclined surface 113, the three surfaces 
forming a projection which is snugly received in the locking ring 83 whose 
cross section is generally triangularly shaped as best seen in FIG. 21. It 
should be understood that the slant of the lower surface 113 matches the 
slant of the transition section 75, and the upper surface 111 fits snugly 
under the overhanging edge of top section 81. The upper slanted surface 
makes possible the removal of the closure assembly 72 from the container 
assembly 71 upon the application of sufficient force between the lower 
edge of the base wall 97 and the transition section 80. If there is little 
or no foreseeable need to disassemble the closure assembly from the 
container assembly during the normal life of the package, the upper 
surface 111 could be flat, though mold design considerations could still 
indicate the use of the illustrated slanted configuration. 
The unique means for molding the closure assembly in a closed position are 
illustrated best in FIGS. 17, 29 and 26. 
Referring first to FIG. 26, a tamper resistant member which joins the 
closure lid 77 to the closure base 76 is indicated generally at 116. The 
tamper resistant feature is a tab which is formed integrally with base 
wall 97 as best seen in FIG. 26. The tamper resistant tab includes a base 
section 117 which terminates in a thin strap 118 which joins the lower 
outer edge of lid skirt 101 to base wall 97. The strap 118 may, for 
example, be on the order of only about 0.006" in thickness and hence it 
forms a line of weakness which can be readily ruptured by the application 
of upwardly directed thumb pressure on lift tab 78, yet the tamper 
resistant tabs, of which two are shown in FIG. 17, are sufficiently strong 
to maintain the closure base 76 and the top plate 92 and its depending lid 
skirt 101 in the position of FIG. 26 during molding, including ejection, 
and subsequent handling and capping steps. 
It will be noted that since the top plate 92 is oriented relative to the 
base wall 97 as shown in FIG. 17, engagement pressure for pushing the 
closure assembly 72 onto the container assembly 71 may be exerted on the 
upper exposed surface portions 114, 115 of base wall 97, and thus little 
pressure will be exerted on closure lid 77 which would be transmitted to 
the thin straps 118. As a result, the integrity of the straps 118 is 
maintained until the user, such as a consumer, proposes to use the package 
for the first time. 
The unique concealed hinge feature of this invention is illustrated best in 
FIGS. 16-22 and 27. 
Referring first to FIGS. 16, 17 and, initially, to FIG. 22, which is a 
detailed view of the hinge portion of FIG. 21, but to a larger scale, it 
will be seen that the upper surface of the left hinge plate 93 is flush 
with the top surface of top plate 92 so that a smooth, aesthetically 
pleasing appearance is presented to the eye. Since hinge plates 93 and 94 
are identical, only hinge plate 93 will be described. Hinge plate 93 
includes a rear portion 120 and a front portion 121, the two portions 
tapering upwardly at the mid-portion of the hinge plate to define a bend 
line are 122. It will be understood that the material to the right of bend 
line area 122 (as viewed in FIG. 22) in FIGS. 16 and 21 is integral with, 
and forms a portion of, hinge base 95, and the material to the left of 
bend line area 122, as viewed in FIG. 22, is integral with, and forms a 
portion of, top plate 92. 
The hinge assembly 79 includes a U shaped hinge 124 whose rear leg 15 
terminates in a thin strap 176 which in turn is integral with depending 
rear base member 127 which is integral with hinge base 95. The front leg 
128 of hinge assembly 79 terminates in a thin strap 129 which in turn is 
integral with the depending front base member 130 which is integral with 
the top plate 92. The left end and right end portions of hinge 124 are 
preferably cut away as at 131, 122, see FIGS. 17 and 27, to relieve any 
tendency for the hinge assembly to bind as it moves from a fully closed to 
a fully opened position, and back again. 
The closure assembly 12 is illustrated in a fully closed position in FIGS. 
16-21, 23 and 25. This is the position in which the closure assembly is 
molded and snapped onto container assembly 71 prior to the first use of 
the package. 
Of particular importance is that the hinge assembly 79 is located almost on 
the periphery of the area covered by the closure lid 77 and the hinge base 
95. This is accomplished by using the thinnest possible hinge plates 93, 
94 and locating the U shaped hinge 124 as close to the circle defined by 
the inner surface of the closure based wall 97 as possible. Specifically, 
the outermost corners 132, 133 of the hinge assembly opening formed 
between the hinge base 95 and the lid 92 lie on, or almost on, the 
outermost extremity of the horizontal area of the closure lid which, in 
this instance, is the circle defined by the inner surface of the closure 
base wall 77 when projected upwardly to the circular area defined by the 
hinge base 95 and lid 92. 
Further, the hinge plates 93, 94 are of minimum width. They are for example 
only about 1/2 the width of the corresponding hinge plates 33, 34 in the 
embodiment of FIGS. 1-15. The only requirement of the width of the hinge 
plates is that they be sufficiently wide, and thick, to withstand, without 
operative degradation, the number of flexings which will occur over the 
life of the package. It will be understood that the packages with which 
this invention is concerned are intended to be single use packages in the 
sense that they are not intended to be refilled, and are discarded after 
their contents are exhausted. Having in mind these parameters it will be 
appreciated that, using conventional resins, the width of the hinge plates 
93, 94 may be on the order of about 1/16 of an inch when the package is 
applied to consumer products intended to be used in the home. 
A further distinct advantage of the remote setback of the hinge assembly 
relative to the periphery of the closure lid is that the maximum (for a 
top located concealed hinge) radius of swing is provided. Hence the 
closure lid will unlock and flip upwardly with less force than would 
otherwise be the case in constructions in which the hinge assembly is 
located well off the circular periphery, such as the construction 
illustrated in the embodiment of FIGS. 1-15. 
It will also be noted that the embodiment of FIGS. 16-27 provides a double 
seal, if desired, to prevent leakage of the contents. Since the closure 
assembly is composed of currently used resins and hence has substantial 
deformation and yieldability capabilities whenever external forces are 
imposed thereon, a first seal will be formed between the abutting outer 
surface of plug 103 and the inner surface of the dispenser aperture 88, 
and a second seal will be formed between the abutting inner surface of 
second plug 105 and the vertical outer surface of spout 84. If desired, 
either one of said seals may be omitted if the end use conditions only 
require a single seal as would be the case with axle grease, for example. 
In all probability if only one seal were employed it would usually be the 
plug 103, and the second plug 105 would be eliminated. 
It will thus be seen that a unique closure assembly, and a closure assembly 
in combination with a container assembly to form a package, has been 
disclosed in which a smooth exterior periphery is provided, together with 
a concealed internal hinge which provides a smooth upper surface. At the 
same time, the closure assembly may be molded in a closed position thereby 
reducing dramatically the cost of production. 
It will be understood that, although a specific embodiment has been 
illustrated and described, modifications and changes may be made within 
the spirit and scope of the invention. Accordingly, it is intended that 
the scope of the invention be limited solely by the hereafter appended 
claims, when interpreted in light of the relevant prior art, and not by 
the foregoing exemplary description.