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Description  |
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BACKGROUND OF THE INVENTION
This invention relates to a liquid container, and, in particular, to a dual
container having two different bottle portions releasably joined for
handling and use.
There are many products which are used together, such as shampoo and hair
conditioner, ketchup and mustard, and oil and vinegar. These products are
generally provided in two separate containers. Thus, the end-user must
keep separate bottles together. For example, after shampooing, it may be
difficult for a person in the shower to find a separate conditioner
bottle. It is thus desirable to be able to store these related products
together so that both may be readily available at the same time.
Dual containers, per se, have been shown in the past. U.S Pat. No.
4,196,808 to Pardo, for example, shows a pair of containers which, as
disclosed, may be bonded together or may be held together by shrink wrap.
This provides for two containers which are either held together as a unit
or are separate. The disadvantage in this is that if one container is
emptied before the other, the empty container cannot be readily replaced
with a fresh container of the used product.
U.S. Pat. No. 3,194,426, to Brown, Jr. and U.S. Pat. No. 4,133,445, to
Mandelbaum, disclose containers which are removably connected. The Brown,
Jr. containers use longitudinal dovetails to lock the containers together
and a detent to prevent relative movement of the bottles along the axis of
the connection. The Mandelbaum containers, which are designed to store
different types of pills for use together, have a large number of
transversely oriented dovetail connections joining each container.
However, the structures of Brown, Jr. and Mandelbaum are not well suited
to many applications. The longitudinal dovetails of Brown, Jr. require
more force to join or separate the bottles than can be easily applied,
particularly when the bottles are made of plastic. The plurality of small
transverse dovetails of Mandelbaum might require less force, but would be
cumbersome to align and would not be stable against lateral bending
forces.
Therefore, it is desirable in many applications to provide a structure
permitting a plurality of containers to be readily joined and separated by
a simple manual motion and yet providing a rugged connection in the joined
condition.
SUMMARY OF THE INVENTION
The dual bottle container of the present invention has a unique interlock
system which permits a pair of separate bottles to be positively joined
and easily separated by simple transverse relative movements. In a
preferred embodiment, the two bottles have generally planar walls with
substantially complementary interlocking portions thereon. The generally
planar wall of one of the bottles has a raised area forming a
substantially flat plateau bordered on opposite sides by rounded lip
portions. The planar wall of the other bottle has a recessed area forming
a substantially flat depression bordered on opposite sides by rounded
groove portions. The plateau is slidable within the depression to cause
the rounded lip portions to engage the rounded groove portions as the
bottles are moved to a predetermined engaged position wherein the
generally planar walls are in close, face-to-face relation. This
engagement prevents relative movement of the bottles transverse to the
direction of sliding movement and facilitates joinder and separation of
the bottles. The rounded groove portions are preferably undercut into the
generally planar wall portion of the second bottle, and the rounded lip
portions and the rounded groove portions are both preferably tapered in a
plane parallel to the generally planar wall portions so that they engage
each other along only a portion of their length. Opposite ends of the lip
portions and groove portions are preferably tapered to form gradual peaks
directed away from the substantially flat plateau and toward the
substantially flat depression, respectively. In a further embodiment, the
dual bottle container is provided with a detent structure in the form of
at least one rib on one of the bottles receivable within an indentation on
the other of the bottles to releasably hold the bottles together once they
are engaged.
The disclosed structure minimizes friction between the two bottles by
minimizing the surfaces over which they contact one another. Nevertheless,
the bottles are held together securely in the joined condition. The
primary contact is between the rounded lip portions of the plateau on one
bottle and the rounded groove portions of the depression on the other
bottle. By their nature, these surfaces interfit smoothly and freely, even
when they and their respective bottles are made of plastic materials. In
addition, the lip portions and the groove portions are preferably tapered
and radiused at their ends to reduce contact between the bottles even
further. Thus, the user need not accurately align the bottles or apply
substantial force to them at the beginning of the movement by which the
bottles are joined. The lip portions and groove portions, in combination
with their respective plateau and depression regions, actually aid in
providing the proper alignment. The radiused ends and the tapered contours
of these connecting portions tend to "cam" the bottles up or down relative
to each other during the joinder process, resulting in accurate alignment
of the two bottles in the fully engaged position.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other features of the present invention may be more fully
understood from the following detailed description, taken together with
the accompanying drawings, wherein similar reference characters refer to
similar elements throughout and in which:
FIG. 1 is a perspective view of a dual bottle container constructed
according to a preferred embodiment of the present invention with a cap
thereon and a label across the front thereof;
FIG. 2 is a perspective view of the dual bottle container of FIG. 1 without
the cap and the label;
FIG. 3 is a top plan view of the dual bottle container of FIG. 2 showing a
detent for preventing relative lateral movement of the bottles from their
interlocked position;
FIGS. 4 and 5 are front elevational views of the two bottles of the
container of FIG. 2 separated from one another;
FIG. 6 is a side elevational view of one of the bottles, the side
elevational views of the two bottles being identical;
FIG. 7 is an elevational view of the cap, partially cut away;
FIG. 8 is a top plan view of the cap showing a closure for an opening of
the cap in its open condition;
FIG. 9 is a side elevational view taken along the line 9--9 of FIG. 8;
FIG. 10 is a perspective view of a dual bottle container constructed
according to another preferred embodiment of the present invention, with a
cap on one of the individual containers;
FIG. 11 is an exploded perspective view of the two containers of FIG. 10 in
the separated condition;
FIG. 12 is a horizontal sectional view taken along the line 12--12 of FIG.
10;
FIG. 13 is a greatly enlarged side elevational view of the bottle on the
left hand side of FIG. 11 showing the upper portion of a plateau region
thereof, the interfitting groove portion of the other bottle being shown
in phantom line; and
FIG. 14 is a greatly enlarged vertical sectional view taken along the line
14--14 of FIG. 13.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the drawings, and in particular to FIG. 1, reference numeral 1
represents a dual bottle container constructed according to a preferred
embodiment of the present invention. The container 1 includes two bottles
3 and 5 which are preferably made from a pliable, deformable synthetic
polymeric material, such as polyethylene or other plastic. Each of the
bottles 3 and 5 has a top wall 7, a bottom 9, an arcuate outside wall 11,
a generally planar side wall 13 and a longitudinal axis A extending
heightwise of the bottle. A neck 15 protrudes up from the bottle top wall
7 and defines a mouth 16 of the bottle. The side wall 13 of the bottles 3
and 5 have a dovetail mortise and tenon 19, respectively, for transversely
interlocking the bottles together in a predetermined side-by-side position
in which the generally planar side walls 13 of the bottles are in close
face-to-face relation, as shown in FIGS. 1 and 2. The mortise and tenon
extend transversely across the walls 13 to join the bottles together so
that the top walls 7, the bottom walls 9 and the sides 11 are
substantially coplanar. Thus the walls 13 are in face-to-face abutting
relation.
The mortise and tenon 19 extend transversely across the walls 13 and are
dovetailed so as to prevent relative vertical and side-to-side horizontal
movement of the bottles 3 and 5. The only relative movement of the bottles
possible is motion in the direction of the dovetail. In a preferred
embodiment, the mortise and tenon 19 cover at least approximately one-half
of the surface area of the generally planar side walls 13.
The relative transverse motion of the bottles can be prevented by adhering
a label 21 to both of the bottles so that it covers the mortise 17 and the
tenon 19, as can be seen in FIG. 1. Thus, the label 21, releasably holds
the bottles 3 and 5 together such that if the product in one bottle is
used up before the product in the other, the label can be broken and the
empty bottle can be replaced with a fresh bottle.
A detent 23 (detent means) may also be used to prevent relative transverse
movement of the bottles 3 and 5. The detent 23 includes rib means
comprising a semi-circular rib 25 which extends longitudinally along the
side 13 of the bottle 5 and an indentation 27 on the side 13 of the bottle
3. The rib 25 and the indentation 27 are positioned on their respective
walls so that they mate releasably to hold the two bottles in the stated
predetermined side-by-side position in which the outside walls 11 of the
bottles combine to provide for a smooth or uninterrupted outer-surface to
the container 1. The detent 23 facilitates the juncture of the bottles 3
and 5 but does not require the application of undue manual force to result
in their separation. The bottles 3 and 5 are preferably made of a
resilient material, such as plastic (e.g., high density polyethylene), so
that by exerting sufficient manual force, the walls 13 will deform (if
required) allowing the rib 25 to slide out of the indentation 27 and
thereby allowing separation of the bottles 3 and 5.
In accordance with this invention, the necks 15 of the container 1 are
closed by cap means which, as shown in FIG. 1, is a unitary cover 31. The
cover 31 includes openings 33 which define outlets for the bottles 3 and
5, respectively. The openings 33 can be opened and closed independently of
each other. Thus, the cover 31 need not be removed from the container 1.
Accordingly, the cover provides another mechanism for preventing relative
transverse motion of the bottles 3 and 5.
As shown in FIGS. 7-9, the cover 31 includes two identical halves 31a and
31b, only one of which will be described. Each cover half includes a top
35 having an exterior surface 36 and an interior surface 37, a side wall
39, and an open bottom 41. A first cylinder 43 depends from the interior
surface 37 of the top 35. It is positioned such that it is concentric with
and so it fits over the outside of the neck 15 of the bottle 3 or 5 when
placed on the container 1. A second cylinder 45 depends downwardly from
the top inner surface 37 concentrically within the first cylinder 43. The
second cylinder 45 is sized to be received within the neck 15 when the
cover 31 is placed on the container 1. The cylinders 43 and 45 define an
annular groove 47 which receives the neck 15. The fit of the neck 15 in
the groove 47 is preferably snug so that the cover 31 will not readily
come off of the container 1 and so that the neck is sealed relative to the
cap.
Slots 49a, 49b are formed in the top exterior surface 36. Each slot 49
extends across the cover 31 from the front to the back thereof. The
opening 33 is formed within each slot 49a, 49b. Arms 51a, 51b are hingedly
connected to the cap 31 so that they may be received in a respective slot
49a, 49b. Each arm 51a, 51b includes a pin 53 which is sized and
positioned to sealably snap fit into a respective opening 33 when the arm
is swung down into its slot 49a, 49b so as to close the bottle outlet.
Each arm is preferably as long as its slot 49a, 49b, as can be seen in
FIGS. 1 and 8.
Referring now to FIGS. 10-12, which illustrate a dual bottle container
constructed according to another preferred embodiment of the present
invention, the container 100 is made up of a first bottle 102 and a second
bottle 104 releasably joined along substantially planar side walls 106 to
form a composite structure having a generally continuous arcuate outer
surface 108. The bottles are joined by a substantially flat plateau 110 of
the bottle 102 which engages a substantially flat depression 112 of the
bottle 104. The plateau 110 and the depression 112 are formed in the
planar side walls 106 of the respective bottles and extend transversely
over the width of the side walls. Thus, the plateau 110 is slidably
receivable within the depression 112 for joinder of the bottles in the
manner shown in FIG. 11
The primary surfaces of engagement between the plateau 110 and the
depression 112 are located at the upper and lower boundaries of the two
elements and are specially configured for ease of operation. Thus, the
plateau 110 is bordered by rounded lip portions 114 and 116 at its upper
and lower ends, respectively, which extend vertically beyond the remainder
of the plateau portion to define channels 118 and 120. Similarly, the
depression 112 of the bottle 104 is bordered by upper and lower rounded
groove portions 122 and 124, respectively, formed within the substantially
planar side wall 106 of the bottle 104. This results in a pair of rounded
or blunt edge portions 126 and 128 which extend inwardly toward the
depression 112.
The lip portions 114 and 116 and the groove portions 122 and 124 are
"rounded" in the sense that they have a rounded cross section which
minimizes friction and binding between the parts. This characteristic of
the connecting structure is seen most clearly in FIG. 14.
The plateau 110 is received within the depression 112 for sliding movement
such that the rounded lip portions 114 and 116 engage the rounded groove
portions 122 and 124 for smooth sliding movement between the joined (FIG.
10) and separated (FIG. 11) conditions of the dual container 100. In a
preferred embodiment, the plateau 110 and the depression 112 cover
approximately one-half of the surface area of the substantially planar
walls 106.
The sliding engagement of the bottles is further facilitated by other
structural features of the lip and groove portions, as illustrated in FIG.
13. FIG. 13 shows that the rounded lip portion 114 tapers outwardly within
the plane of the plateau 110 from a maximum or "peak" 130 to a pair of
radiused outer ends 132. Similarly, the rounded groove portion 122, shown
in phantom line in FIG. 13, also tapers outwardly within the plane of the
depression 112 from a "peak" 134 to a pair of radiused outer ends 136. As
illustrated, the outer ends 136 of the groove portion 122 are preferably
curved to a larger radius than the outer ends 132 of the plateau 110. Of
course, these features apply to all of the rounded lip portions and
rounded groove portions of the container 100.
The tapered configuration of the lip portion 114 and groove portion 122
further reduces friction and any tendency of the parts to "bind" during
sliding movement. As a result of this double taper, the lip portion 114 of
the plateau 110 does not interfere with, or even engage, the structure of
the groove portion 122 until the two bottles are slid together (FIG. 11)
approximately one-third of the distance toward the fully joined condition
(FIG. 10). In the fully joined condition, the peak 130 of the lip portion
114 overlaps the peak 134 of the groove portion 122 to hold the bottles
together against longitudinal (vertical) forces. The outer ends of the lip
portion 114 and the groove portion 122, however, do not overlap, as shown
in FIG. 13, due to the tapered profiles of the two elements. In addition,
the radiused outer ends 132 and 136 prevent interference of the parts, and
therefore binding of the bottles, in the early stages of the joining
process. In fact, the extreme radiuses provided on these elements causes
them to cam the two bottles up or down until they are aligned. Thus, the
plateau and depression structure of the container 100 advantageously
contributes to the proper alignment of the bottles in the joinder process.
The bottles 102 and 104 are held in the joined condition of FIG. 10 by a
detent structure illustrated most clearly in FIGS. 11 and 12. The bottle
104 has longitudinal rib segments 138 which engage longitudinal
indentations 140 of the bottle 102 to "lock" the bottles in a joined,
side-by-side relationship with the substantially planar side walls 106
closely abutting each other. This condition is shown in cross section in
FIG. 12, wherein the rib segment 138 is received within the indentation
140 to resist sliding movement of the plateau 110 within the depression
112. When it is desired to separate the two bottles, a greater force is
applied in the direction of sliding movement to release the rib segment
138 from the indentation 140. This additional required force is nominal,
however, due to the easily deformable character of the side wall 106.
Nevertheless, the reta | | |
