Container assembly for separated flowable containers

Abstract

A container assembly consisting of an outer container and an inner container is provided. The outer container has a recess that conforms in its shape to the shape of the inner container, whereby a cavity is formed in the outer container between the outer walls of the outer container and the walls of the recesses. When the containers are filled with flowable materials and are assembled, both flowable materials are isolated from each other and are not miscible. The containers have engageable threads on the mating surfaces so that the inner container can be inserted into the outer container by twisting. The unique feature of the assembly is a provision of one, two, or three locking means for securing the containers in the assembled state.

Claims

1. A container assembly for separated flowable contents comprising: a first container having a bottom surface, a length, an outer wall having an inner side, a recess that has a shape and a recess wall that has an inner side and an outer side and that extends in the direction from the bottom surface of the first container inward to a part of the length thereof, and a first sealable cavity for a first content formed between the inner side of the outer wall of the first container and the outer side of the recess wall; a second container having a bottom surface, a wall having an outer side, and a second sealable cavity formed inside the second container for a second content, the second container having an outer shape conforming to the shape of the recess of the first container; a first thread on the outer side of the recess wall, and a second thread formed on the outer side of the wall of the second container which is engageable with the first thread through a threading connection therebetween, the first thread and the second thread forming mating threads; and a first locking means for locking the second container inside the first container when the second container is inserted into the first container to a state of complete assembling by threading the second thread into the first thread to the end of the threading, wherein the first locking means comprises a gap between the thread of one of the containers and the thread of the other container which gradually decreases over the entire length of both threads from a loose fit between the threads to a snug fit in said state of complete assembling for locking the second container in the first container.

2. The container assembly according to claim 1, further comprising a second locking means in a form of at least one projection on one of the threads and at least one dimple on the other of the threads, the projection and the dimple being located on the respective threads in positions which are aligned in said state of complete assembling and provide a snapping action between the projection and the dimple when aligned for locking the second container in the first container.

3. The container assembly according to claim 2, further provided with a third locking means comprising a circular ridge on one of the containers and an annular recess on the other of the containers, the circular ridge and the annular recess being located on the respective containers in positions which are aligned in said state of complete assembling and provide a snapping action between the circular ridge and the annular recess when aligned for locking the second container in the first container.

4. The container assembly according to claim 3, wherein the containers are bottles.

5. The container assembly according to claim 4, wherein the bottom surface of the second container has deepenings.

6. The container assembly according to claim 2, wherein the containers are bottles.

7. The container assembly according to claim 6, wherein the bottom surface of the second container has deepenings.

8. The container assembly according to claim 1, wherein the containers are bottles.

9. The container assembly according to claim 1, wherein the bottom surface of the second container has deepenings.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a longitudinal cross-sectional view of the outer and inner bottle bottles of the invention in an assembled state.

(2) FIG. 2 is a longitudinal sectional view of an outer bottle used in the assembly of the invention.

(3) FIG. 3 is a side view of an inner bottle used in the assembly of the invention.

(4) FIG. 4 is a perspective rear view of the bottles of the invention in the assembled state.

(5) FIG. 5 is a cross-section along the line V-V of FIG. 1.

(6) FIG. 6 is a development of the gap between the threads in the longitudinal direction of the assembly from the bottom to the neck.

(7) FIG. 7 is a perspective rear view of the bottle assembly of the invention illustrating the removal of the inner bottle by untwisting it from the outer bottle.

DETAILED DESCRIPTION OF THE INVENTION

(8) This invention relates generally to containers, and more particularly, to two containers inserted one into the other and containing two different or similar liquids kept separated and thus not miscible when the containers are in an assembled state. In the following context, just exemplarily the containers will in some places be referred to as bottles.

(9) The present invention will now be described in more detail with reference to the accompanying drawings, wherein FIG. 1 is a longitudinal cross-sectional view of the outer and inner bottle bottles in an assembled state. More specifically, the container assembly, which is in general is designated by reference numeral 20, consists of an outer bottle 22 having a length M1 and an outer wall 22a and an inner bottle 24 having a length M2 and an outer side 24c, where the M1 is greater than the length M2. The outer wall 22a has an inner side 22a1. Both bottles are shown empty but may contain different or the same flowable contents such as liquids or powders. FIG. 2 is a longitudinal sectional view of the outer bottle, and FIG. 3 is a side view of the inner bottle.

(10) As can be seen from FIG. 2, the outer bottle 22 has an inner-bottle receiving cavity 26 which has a shape to conforms to the outer shape of the inner bottle 24 (FIG. 3) so that, when the inner bottle 24 is inserted into the inner-bottle receiving cavity 26 of the outer bottle 22, it completely fills this cavity and is held entirely inside the outer bottle 22 without protruding beyond the outlines of the latter.

(11) The interior of the inner bottle 24 forms a sealable cavity 28, which hereafter will constitute a second sealable cavity for containing a second flowable material, e.g., a liquid (not shown). On the other hand, the inner-bottle receiving cavity 26 does not fill the entire interior of the outer bottle, and a first sealable cavity, i.e., a space 30 still remains inside the outer bottle 22 between the inner side 22a1 of the wall of the outer bottle 22 and a recess wall 22b of the inner-bottle receiving cavity 26. The recess wall has an inner side 26c and an outer side 22b1.

(12) It is understood that both cavities 26 and 28 can be sealed by closing the upper ends of the bottles with respective caps, e.g., by screwing caps 32 and 34 on the threaded mouths of the respective bottles.

(13) For inserting the inner bottle 24 into the outer bottle 22, the outer side 24c of the inner bottle 24 has a first thread, i.e., an internal thread 24d, and the outer surface 26c of the inner-bottle receiving cavity 26 has an external thread 26d so that for assembling of the bottles into an integral unit, the inner bottle 24 is screwed into the outer bottle 22.

(14) The threads may be a left-hand or a right-hand thread with a helix angle, e.g., in the range of 30 to 50 with a rectangular profile in cross section. The width of the thread may vary, e.g., from 3 mm to 15 mm, and the thread pitch may be in the range of, e.g., 20 mm to 80 mm. The depth of the internal thread, and hence, the height of the external thread, may vary in the range of 0.5 mm to 3 mm. These values are just practical examples and do not limit the scope of the invention. It is understood that actual geometry of the threads will depend on the size of the containers, thickness of their walls, and the like.

(15) The inner bottle 24 is shorter than or equal to the depth of the inner-bottle receiving cavity 26 of the outer bottle 22. Therefore, in an assembled state (FIG. 1) the inner bottle remains within the outlines of the outer bottle so that the end face or bottom 24e of the inner bottle 24 is located deeper or in flush with the bottom 26e of the outer bottle 22. It is understood that the internal thread can be formed on the inner bottles and the external on the outer bottles or vice versa, i.e., the internal thread can be formed on the outer surface of the inner-bottle receiving cavity 26 and the external thread can be formed on the outer surface of the inner bottles.

(16) For convenience of insertion of the inner bottle 24 into the outer bottle 22, a gripping portion is formed in the bottom of the inner bottles, e.g., in the form of recesses, e.g., two diametrically opposite recesses for user's fingers (see FIG. 4, which is a perspective rear view of the bottles 22 and 24 in the assembled state). It can be seen that the bottom 24e of the inner bottled 24 (FIG. 3) has recesses or deepenings 24f and 24g. The deepenings 24f and 24g have depths t (FIG. 3) sufficient for insertion of the user's fingers F and walls 24h and 24i substantially perpendicular to the bottom surface for use as abutments for the fingers.

(17) A distinguishing feature of the container assembly 20 of the present invention is that both containers, i.e., bottles 22 and 24, are additionally provided with at least one locking means for securely locking the bottles in the final assembled position.

(18) According to one aspect of the invention, the locking means is formed by snapping engagement between at least one projection on one of the threads and a dimple on the other of the threads. Two such snapping engagements 36 and 38 are shown as examples in FIG. 5, which is a cross-section along the line V-V of FIG. 1. In the illustrated case, projections 36a and 38a are formed on the external thread 26d of the outer bottle, and the dimples or recesses 40a and 40b are formed on the internal thread 24d. It is possible, within the scope of the invention, to form projections on the internal thread and dimples or recesses on the external thread.

(19) Snapping is provided by making the height of the projection 36a and 38a slightly higher than the thickness of the gap G between the threads so that, when the inner bottle 24 reaches its final position in the outer bottle 22 (i.e., the position shown in FIG. 1), the projections 36a and 38a are aligned with the recesses 40a and 40b and are snapped in them. The depth of the recesses ensures snug fit of the projections in the dimples. According to another aspect of the invention, the assembly 20 may be provided with an additional. i.e., a second locking means that may be used independently or simultaneously with the above-mentioned projections and dimples on the threads. The second locking means is based on a similar interaction between a circular ridge 42 (FIG. 3) on the outer surface of the neck 38a (FIG. 3) of the inner bottled 24 and an annular groove or recess 44 (FIG. 2) formed on the mating surface of the inner-bottle receiving cavity 26, or vice versa. In other words, the ridge can be formed on the surface of the inner-bottle receiving cavity 26 and the annular recess can be formed on the neck of the inner bottle. Similar to the case of the first locking means, the height of the ridge and the depth of the annular recess are selected so as to provide an easily separable snapping connection.

(20) According to still another aspect of the invention, the bottle assembly 20 may have a third locking means suitable for use independently and/or simultaneously with the first and/or a second locking means or with both of them simultaneously. This third locking means comprises a gradually reduced helical gap or backlash G (FIG. 5) between the tip of the external thread 26d and the valley of the interacting internal thread. In other words, the gap G between the external and internal threads of both bottles varies from a loose fit at the beginning of the bottled assembling operation to a snug fit when the inner bottle reaches its final position (FIG. 1) in the inner-bottle receiving cavity 26 of the outer bottle 22. As a result, the snug fit will secure the inner bottle 24 inside the outer bottle 22 due to friction between the interacting surfaces of the mutually engaged threads.

(21) The bottles may be disconnected from each other by applying an insignificant force but the disconnection force is much higher than the locking force of snapping or friction that hold the bottles together.

(22) The inner container and the outer container, which in the illustrated case are bottles, may be made of a suitable material or materials, for example, of polystyrene, polyurethane, glass, or other materials, for enabling connection and disconnection thereof. The relative sizes of the containers may be the sizes of standard white wine bottles for the outer bottle, and smaller size standard bottles for the red wine inner bottle. The red and white wines are mentioned just exemplarily. It is preferable that the bottle materials are transparent, although the use of non-transparent materials is also within the scope of the present invention.

(23) Although there are no special restrictions with regard to the dimensions of the bottles, for bottles of the aforementioned type it is recommended to maintain the backlash between the mating threads 24d and 26d of the inner and outer bottles in the following range: H from 2 mm to 0.38 mm and a from 5 to 2.8, where a is a taper angle and H is the backlash value in the middle of the threaded connection in the assembled state of the bottles. It is meant that in the assembled state of the bottles (FIG. 1) the maximum value of the H selected in the indicated range is a value of the gap between the external and internal threads at the bottom side of the assembly and that at the opposite end of the threaded connection there will be no gap at all and the threads will have a snug fit. This is shown in FIG. 6, which is a development of the gap G, where H is shown in the middle of the threads, i.e., L1=L2, where L is the length of the gap development, i.e., the length of the thread.

(24) In use, the cavity of the inner bottle 24, i.e., the second sealable cavity 28, is filled with one flowable contents, e.g., a red wine (not shown), and the inner bottle is sealed by threading a respective cap 34 onto the threaded mouth 37 of the inner bottle 24. The interior of the outer bottle 22, i.e., the first sealable cavity 30, is filled with a first flowable content, e.g., a white wine (not shown), and the first sealable cavity 30 is then sealed by screwing a respective cap 32 onto the threaded mouth 37 of the outer bottle 22.

(25) When it is necessary to assemble both bottles into a compact assembly 20 that is suitable for placing into a small carry-on bag, rucksack, backpack, etc., and go, e.g., to picnic, a user inserts the inner bottle 24 filled with one content into the outer bottle 22 filled with another content by screwing the thread 24d of the inner bottle into the thread 26d of the outer bottled 22. When the inner bottle 24 reaches its final assembled position (FIG. 1), it is fixed in this position by one, two, or all three locking means described above, i.e., by projections 36, 38 and recesses 36a, 38a, and/or by the ridge 42 and the annular recess 44, and/or by the friction on the threads 24d and 26d. Since in the assembled state the contents of both bottles are physically isolated, they are prevented from mixing.

(26) When it is necessary to use the separated liquids, the bottles 22 and 24 are disconnected by unscrewing the inner bottle 24 from the outer bottle 22 by inserting the fingers on one hand of the user (see FIG. 7) into the deepenings 24f and 24g in the bottom of the inner bottle 24 and twisting the inner bottles in the unscrewing direction (in the illustrated case, in the counterclockwise direction) while holding the outer bottle 22 within the fingers of the other hand.

(27) The invention has been described and shown with reference to specific examples. It is understood that these examples should not be construed as limiting the application of the invention and that any changes and modifications are possible without deviation from the scope of the attached patent claims. For example, the outer container may have a rectangular external shape, provided that the inner-bottle receiving cavity has the shape of a body of rotation with an internal or external thread, depending on what thread is needed for engagement with the mating thread of the inner bottle. Both bottles may contain the same contents.

(28) Both containers may contain powders or liquids, or one container may contain a liquid and the other a powder.