Skin care container with dual Anti-rotation locking mechanism

Abstract

The present invention relates to a cosmetic container assembly comprising a liquid storage container and a container cap equipped with an enhanced anti-rotation mechanism. The assembly is specifically configured to reduce unintended rotation, leakage, and wear that are frequently encountered in conventional threaded closures. The liquid storage container includes a connecting portion incorporating first and third anti-rotation portions, while the container cap is provided with second and fourth anti-rotation portions arranged to cooperatively engage with those of the container. The first anti-rotation portion is defined by a guide convex portion and a blocking convex portion, which together create a stepped surface with different radial heights for guiding insertion and secure locking of the second anti-rotation portion. The third anti-rotation portion includes a guide wall and blocking wall for receiving the fourth anti-rotation portion. Their cooperative engagement along concentric circles ensures improved stability, tactile feedback, and reliable sealing performance.

Description

TECHNICAL FIELD

[0001] The present invention relates to a locking mechanism for container closures, and more particularly to an improved dual anti-rotation locking system for storage containers and container caps that prevents unintended loosening, enhances sealing reliability, and ensures long-term stability of liquid storage containers. This invention particularly concerns a structural arrangement that prevents relative rotation between the liquid storage container and its container caps. This improves the sealing and stability of the container during use and applies to various skin care and cosmetic fluid delivery systems.BACKGROUND

[0002] Traditional containers for liquid skincare and cosmetic products generally employ threaded caps or snap-fit covers to achieve sealing and to prevent leakage of the formulation. While these designs represent the industry standard, they are far from flawless. Conventional threaded caps are highly susceptible to unintentional loosening during routine handling, transport, or repeated opening and closing cycles. Even minor vibrations or impact forces can cause the cap to rotate and disengage from the threads, leading to product leakage, contamination, or complete spillage. Snap-on covers, although faster to use, often lack sufficient locking force and can disengage unpredictably, posing similar risks. These deficiencies not only compromise the integrity of the stored product but also diminish user confidence in the container system.

[0003] Another critical drawback of conventional designs lies in their inability to effectively restrict rotational movement once the container cap is in place. Most existing solutions rely almost exclusively on thread friction or the elasticity of the snap joint to resist rotation. Over time, thread wear, material fatigue, or changes in environmental conditions such as humidity and temperature significantly reduce this frictional resistance. As a result, the container cap becomes progressively easier to rotate, leading to inconsistent sealing forces, unpredictable closure tightness, and reduced long-term reliability. This is particularly problematic in the skincare and cosmetic industry, where users expect both airtight sealing to preserve product quality and effortless usability during daily application.

[0004] Attempts to address these shortcomings have typically introduced only a single anti-rotation feature, such as a locking lug or a notch-and-tab mechanism. However, these single-point solutions often provide insufficient stability, as forces applied in other directions can still overcome the locking element. Moreover, the lack of redundancy in such systems means that once the single anti-rotation feature wears down, the overall container performance rapidly deteriorates. Thus, existing technologies fail to deliver a robust, multi-directional anti-rotation solution that can withstand extended use without sacrificing ease of assembly or user convenience.

[0005] The present invention directly addresses these challenges by introducing a container assembly equipped with a dual anti-rotation mechanism. Unlike traditional designs, the invention employs first and second anti-rotation devices arranged on concentric circular paths, each providing distinct locking functions. The coordinated use of convex projections, recessed notches, and elastic guiding structures ensures that rotational movement is restricted from multiple directions simultaneously. This design not only enhances sealing reliability but also provides tactile feedback to the user, signalling when the container cap is securely engaged. The redundancy of having two anti-rotation devices significantly reduces the risk of loosening, even after repeated usage cycles.

[0006] By integrating these structural innovations, the invention overcomes the long-standing problems of leakage, inconsistent sealing, and premature wear in conventional container systems. It ensures long-term durability, repeatable assembly performance, and superior protection of the stored formulation. This makes the invention particularly advantageous for liquid skincare, cosmetic, pharmaceutical, and other sensitive liquid-based products where leakage prevention, product integrity, and user convenience are of paramount importance.OBJECTS OF THE INVENTION

[0007] Some of the objects of the invention are as follows:

[0008] An object of the present invention is to provide a container assembly with improved anti-rotation mechanisms that enhance sealing reliability and prevent unintended loosening of the container cap.

[0009] Another object of the present invention is to provide a container assembly that incorporates dual anti-rotation devices arranged on concentric circular paths to maximize rotational stability.

[0010] Another object of the present invention is to provide a container assembly that reduces wear and tear of threaded connections, thereby increasing the durability and service life of the product.

[0011] Another object of the present invention is to provide a container cap and liquid storage container with interchangeable anti-rotation configurations, including projections and notches, enabling flexible design variations.

[0012] Another object of the present invention is to provide a container assembly that offers tactile feedback during assembly through elastic guide portions, improving user experience.

[0013] Another object of the present invention is to provide a container assembly with double-threaded connections, allowing faster installation and multiple angular starting positions for convenience.

[0014] Another object of the present invention is to provide a container assembly that ensures secure engagement between the container cap and the storage container even after prolonged use and repeated assembly cycles.

[0015] Another object of the present invention is to provide a container system with modular compatibility, wherein container caps can be interchangeably used across multiple containers while maintaining anti-rotation functionality.

[0016] Another object of the present invention is to provide a container assembly suitable for use in skincare, cosmetic, and pharmaceutical applications, ensuring reliable storage and controlled dispensing of liquid formulations.

[0017] Another object of the present invention is to provide a container assembly that is particularly useful in situations where the upper unit or cover is rotated during use while the lower base of the container remains fixed. The dual anti-rotation locking mechanism ensures that the base does not rotate together with the upper unit, thereby maintaining stability of the container, preventing loosening of the connection, and ensuring consistent sealing performance even under repeated handling or one-handed operation.SUMMARY OF THE INVENTION

[0018] According to a first aspect of the present invention, a container assembly is provided. The container assembly comprising: a liquid storage container having a container body and a connecting portion with a liquid outlet; a container cap configured to be detachably mounted onto the liquid storage container, wherein the container assembly includes: a first anti-rotation device comprising a first anti-rotation portion disposed on the liquid storage container and a second anti-rotation portion disposed on the application head or container cap; a second anti-rotation device comprising a third anti-rotation portion disposed on the liquid storage container and a fourth anti-rotation portion disposed on the application head or container cap, wherein the first and second anti-rotation devices are arranged along different concentric circular paths concentric with the liquid outlet.

[0019] In one embodiment of the invention, the first anti-rotation portion is formed by a blocking convex portion and a guide convex portion spaced apart to define a limiting gap, and the second anti-rotation portion is a projection configured to enter the limiting gap and abut against the blocking convex portion to restrict rotation.

[0020] In one embodiment of the invention, the second anti-rotation portion is positioned on an annular sleeve concentrically disposed inside the container cap, the annular sleeve being threadedly coupled to the connecting portion of the liquid storage container.

[0021] In one embodiment of the invention, the first anti-rotation portion is formed as a recessed groove with an inclined arcuate bottom surface that guides the second anti-rotation portion into a stable anti-rotation position.

[0022] In one embodiment of the invention, the third anti-rotation portion is formed as a notch on the circumferential wall of a positioning boss disposed on the liquid storage container, and the fourth anti-rotation portion is a projection on the mounting groove of the container cap, the projection being received in the notch to prevent relative rotation.

[0023] In one embodiment of the invention, the mounting groove of the container cap is dimensioned to closely fit over the positioning boss, thereby enhancing the structural stability and reducing wobbling during use.

[0024] In one embodiment of the invention, the container assembly further includes double-threaded connections between the annular sleeve of the container cap and the connecting portion of the liquid storage container, enabling secure fastening from multiple angular positions and reducing thread wear.

[0025] According to a second aspect of the present invention, a container system is provided. The container system comprises: a plurality of liquid storage containers and container caps, each provided with first and second anti-rotation devices, wherein the container cap may be interchangeably mounted on different liquid storage containers while maintaining rotational stability through coordinated engagement of the anti-rotation portions.

[0026] In one embodiment of the invention, the third anti-rotation portion is provided as a triangular notch with a guide wall and a blocking wall, and the fourth anti-rotation portion is configured to slide along the guide wall and be stopped by the blocking wall, thereby securely clamping the container cap.

[0027] In one embodiment of the invention, the first anti-rotation device and the second anti-rotation device are arranged along different radial directions of concentric circular paths, such that rotation is restricted from four directions, providing enhanced resistance against loosening.

[0028] In one embodiment of the invention, the container cap further comprises a magnetic locking element cooperating with a corresponding magnetic element on the connecting portion of the container, thereby improving installation stability.

[0029] In one embodiment of the invention, the guide convex portion of the first anti-rotation device is elastically deformable, enabling smooth sliding of the projection and providing tactile feedback during assembly.

[0030] In one embodiment of the invention, two or more pairs of first and second anti-rotation portions are symmetrically disposed along opposing radial directions, increasing the locking effect and enhancing sealing reliability.

[0031] According to a third aspect of the present invention, a cosmetic container is provided. The cosmetic container comprising: a liquid storage container with a connecting portion; a container cap or / and a container cap with an application head and a base; a first anti-rotation device disposed along a first concentric circular path; and a second anti-rotation device disposed along a second concentric circular path, the combination of which prevents rotational misalignment, reduces wear on threaded connections, and ensures secure, repeatable assembly over prolonged use.

[0032] In one embodiment of the invention, the container assembly further includes sealing members and guided alignment structures, thereby preventing leakage of stored liquid formulations and improving user convenience.

[0033] In one embodiment of the invention, the container system is configured for use in skincare, cosmetic, and pharmaceutical applications, ensuring controlled dispensing, long-term durability, and improved user experience.

[0034] In the context of this specification, the term “first anti-rotation device” refers to any pair of engaging structures positioned along a first concentric circular path for restricting relative rotation between the container cap and the liquid storage container.

[0035] In the context of this specification, the term “second anti-rotation device” refers to any pair of engaging structures positioned along a second concentric circular path, concentric with the first, for providing additional restriction against rotation.

[0036] As used herein, the terms ‘container cover,’‘container cap,’ and ‘application head’ may be used interchangeably to describe the detachable closure element coupled to the liquid storage container.

[0037] Unless otherwise indicated, all directional references such as “upper,”“lower,”“radial,”“axial,”“inner,”“outer,” and similar terms are used for convenience of description and are not intended to limit the orientation or relative position of the elements described. The terms “comprising,”“including,”“having,” and similar terms are intended to be open-ended and encompass additional features or components not expressly listed.

[0038] In the context of this specification, guiding elements such as protrusions, lugs, bosses, tabs, or ribs may cooperate with grooves, notches, recesses, or slots to achieve alignment, orientation, or anti-rotation functionality. These guiding and restraining features may be symmetrical or asymmetrical, continuous or intermittent, and may include angled, curved, or stepped surfaces to facilitate smooth engagement and controlled locking. It will be understood that such guides and grooves may be positioned radially, axially, circumferentially, or in any other arrangement suitable for the intended function.

[0039] In the context of this specification, the term “positioning boss” refers to a protruding element on the liquid storage container configured to cooperate with the mounting groove of the container cap for alignment and stabilization.

[0040] In the context of this specification, the term “annular sleeve” refers to a cylindrical extension within the container cap configured with internal threads and anti-rotation features for coupling with the connecting portion of the liquid storage container.

[0041] In the context of this specification, the term “double-threaded connection” refers to a threaded coupling having multiple starting positions, enabling faster installation, reduced wear, and secure fastening of the container cap and may include single-start threads, double-start threads, or multi-start threads, and may be formed in any suitable profile such as triangular, square, trapezoidal, rounded, buttress, or custom thread forms. The threads may be integrally formed, machined, molded, or provided as inserts. It should be appreciated that the thread pitch, lead, and depth may be varied according to the required sealing, torque, or user ergonomics, and that left-handed, right-handed, or reverse threads are contemplated within the scope of the invention.

[0042] Unless otherwise specified, references to “connection” or “engagement” between two components are intended to encompass permanent, semi-permanent, and releasable connections, including but not limited to threaded connections, snap-fit couplings, press-fit couplings, bayonet locks, magnetic engagement, adhesive bonding, welding, or any equivalent fastening technique. Such connections may be rigid or flexible, and may be supplemented with seals, gaskets, or O-rings to enhance fluid tightness or stability.

[0043] In the context of this specification, the term “container” as used herein is intended to broadly container cap any receptacle, vessel, reservoir, bottle, vial, jar, cartridge, or housing capable of storing or dispensing a fluid, cosmetic, skincare, pharmaceutical formulation, cream, gel, or other material. The container may be rigid or flexible, transparent or opaque, disposable or refillable, and may be fabricated from plastic, glass, metal, non-metal, composite, or biodegradable materials. The container may be manufactured in a single piece or multiple assembled parts, and may optionally include reinforcement ribs, handles, or ornamental features.

[0044] In the context of this specification, the term “application head” as used herein is intended to broadly encompass any component configured to deliver, dispense, spread, massage, or otherwise apply a fluid, gel, cream, or other substance from the container to a target surface such as skin, scalp, or hair. The application head may take the form of, but is not limited to, a nozzle, spout, roller, ball applicator, brush, sponge, pad, comb, spray outlet, dropper tip, or porous dispensing surface.

[0045] Unless otherwise specified, the application head may be fixed, detachable, interchangeable, or rotatable relative to the container or lid. In certain embodiments, the application head may be integrated with functional elements such as vibration modules, heating or cooling devices, light emitters, or microcurrent electrodes to provide therapeutic or cosmetic benefits.

[0046] The components of the skin care kit may be manufactured from plastics, metals, ceramics, glass, composites, biodegradable polymers, or multilayer laminates. Materials may be selected for transparency, opacity, barrier properties, chemical resistance, recyclability, or tactile comfort.

[0047] Unless otherwise specified, locking features may include bayonet locks, detents, snap-fits, latch members, or magnetic couplings, and may serve as primary or secondary safety measures. These may be employed to prevent unintentional opening, accidental spillage, or tampering. The locking system may further incorporate child-proof or senior-friendly design variations.

[0048] The feedback features disclosed herein may include tactile, audible, or visual cues that signal correct engagement or locking of components. Tactile feedback may be provided by elastic deformation of a guiding protrusion, snap-fit detents, or the interference between a protrusion and a blocking wall. Audible feedback may occur in the form of a click, snap, or vibration resulting from the seating of parts. Visual feedback may be provided through alignment marks, indicator windows, color changes, or surface patterns that confirm closure status. It should be understood that any combination of tactile, audible, or visual feedback may be employed to enhance user experience and ensure reliable operation.BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

[0049] The accompanying drawings illustrate the best mode for carrying out the invention as presently contemplated and set forth hereinafter. The present invention may be more clearly understood from a consideration of the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings wherein like reference letters and numerals indicate the corresponding parts in various figures in the accompanying drawings, and in which:

[0050] FIG. 1 illustrates a cosmetic device provided with a container cap and a liquid storage container, in accordance with an embodiment of the present invention.

[0051] FIG. 2 illustrates a bottom view of the container cap showing the structure of the bracket, in accordance with an embodiment of the present invention.

[0052] FIG. 3 illustrates the structure of a liquid storage container, in accordance with an embodiment of the present invention.

[0053] FIG. 4 illustrate a top view of the liquid storage container, in accordance with an embodiment of the present invention.

[0054] FIG. 5 illustrate a top view of the liquid storage container with a point ‘A’, in accordance with an embodiment of the present invention.

[0055] FIG. 6 illustrates an enlarged view of point ‘A’ shown in FIG. 4, in accordance with an embodiment of the present invention.

[0056] FIG. 7 illustrates a top view of the liquid storage container provided with a first concentric circular path and a second concentric circular path, in accordance with an embodiment of the present invention.

[0057] FIG. 8 shows a cross-sectional view of the engagement of a one or more anti-rotation portions of the application head and the liquid storage container, in accordance with an embodiment of the present invention.

[0058] FIG. 9 illustrates a perspective view of an alternate container cap with a main body and a lower base, in accordance with an embodiment of the present invention.DETAILED DESCRIPTION

[0059] Embodiments of the present invention disclosure will be described more fully hereinafter with reference to the accompanying drawings in which like numerals represent like elements throughout the figures, and in which example embodiments are shown.

[0060] The detailed description and the accompanying drawings illustrate the specific exemplary embodiments by which the disclosure may be practiced. These embodiments are described in detail to enable those skilled in the art to practice the invention illustrated in the disclosure. It is to be understood that other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the present disclosure. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the present invention disclosure is defined by the appended claims. Embodiments of the claims may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

[0061] The present invention relates to a cosmetic device equipped with an advanced locking mechanism designed to improve sealing reliability and prevent unintended loosening of the container cap. The invention provides a dual anti-rotation structure in which coordinated projections, recesses, and guiding formations are arranged along concentric surfaces of the container cap and the container. These structural elements engage in a complementary manner to restrict relative rotational displacement between the container cap and the container, thereby ensuring stable closure during handling, transport, and repeated usage cycles. By enhancing rotational stability, the locking mechanism maintains a consistent sealing force, prevents leakage or contamination of the stored formulation, and extends the durability of the closure system.

[0062] The present invention relates to a container assembly, particularly a liquid storage container and a container cap, configured with enhanced structural coupling features and anti-rotation mechanisms. The invention aims to address the limitations commonly found in threaded connections between containers and caps, such as loosening, wear, and rotational misalignment over time. To overcome the limitations commonly found in threaded connections between containers and caps, such as loosening, wear, and rotational misalignment over time, the invention introduces multiple anti-rotation structures strategically arranged along concentric circular paths (R1 and R2) about the central axis of the liquid outlet, around the mounting interface. These include first and second anti-rotation parts integrated into threaded coupling components, and third and fourth anti-rotation parts incorporated into the broader container-cap interface. The invention further enables secure, repeatable attachment and detachment, while improving user experience through double-threaded connections, magnetic locking features, and structural reinforcements.

[0063] Referring to FIG. 1, in an embodiment, the present invention provides a cosmetic device comprising a container cap 100 and a liquid storage container 200 for storing a liquid formulation. The container cap 100 is configured to prevent contamination and leakage, and is further provided with an anti-rotation locking mechanism that cooperates with corresponding structural features on the liquid storage container 200 to restrict unintended loosening or rotation during handling. The liquid storage container 200 functions as the storage chamber for the cosmetic formulation and is securely coupled with the container cap 100, which may be implemented as a porous tip, roller, or brush assembly for direct application of the stored product to the skin.

[0064] Referring now to FIGS. 1 to 4, in another embodiment, the present application provides a skincare kit comprising a liquid storage container 200 and a container cap 100. The liquid storage container 200 is formed with a liquid outlet 204. The container cap / applicator head 100 is detachably mounted on the liquid storage container 200, and the container cap 100 connects from the liquid storage container 200 through a first anti-rotation device and a second anti-rotation device. The first anti-rotation device includes a first anti-rotation portion 208 disposed on the liquid storage container 200 and a second anti-rotation portion 156 disposed on the base of the container cap 100. The second anti-rotation device includes a third anti-rotation portion 214 disposed on the liquid storage container 200 and a fourth anti-rotation portion 160 disposed on the container cap 100.

[0065] In an embodiment, the container cap / applicator head 100 houses a bracket 152 that serves as the primary structural portion, providing support, load-bearing capacity, and connection to a corresponding liquid storage container 200. For example, the bracket 152 may include internal threads for threaded engagement with corresponding external threads on a liquid storage container 200.

[0066] In an embodiment, the relative rotation between the container cap 100 and the liquid storage container 200 is primarily facilitated by the bracket 152. The bracket 152 serves as a structural interface that accommodates the connecting portion of the container 200, allowing threaded or guided engagement. During assembly, the bracket 152 permits the container cap 100 to be rotated with respect to the container 200 until the anti-rotation portions, including the first anti-rotation portion 208, the second anti-rotation portion 156, the third anti-rotation portion 214, and the fourth anti-rotation portion 160, achieve full engagement. The bracket 152 thus provides both rotational clearance during mounting and structural reinforcement upon locking. Once the anti-rotation portions are interlocked, further relative movement is restricted, and the bracket functions as a stabilizing component that transmits axial and radial forces between the container cap 100 and the liquid storage container 200, ensuring secure attachment and reliable sealing.

[0067] During use, when the container cap 100 is mounted onto the liquid storage container 200, the second anti-rotation portion 156 of the container cap 100 interlocks with the first anti-rotation portion 208 of the liquid storage container 200, and the fourth anti-rotation portion 160 interlocks with the third anti-rotation portion 214. In this state, if the container cap 100 attempts to rotate relative to the liquid storage container 200, the second anti-rotation portion 156 and the fourth anti-rotation portion 160 are obstructed by the corresponding first and third anti-rotation portions 208, 214. This cooperative arrangement effectively prevents further translation or rotational displacement, thereby restricting rotation of the container cap 100 relative to the liquid storage container 200. The provision of dual anti-rotation devices positioned along concentric circles significantly enhances the locking effect, increases resistance against relative motion, and improves the sealing reliability of the device.

[0068] Furthermore, in an embodiment, the magnetic locking may be provided by permanent magnets, magnetic alloys, or embedded magnetic elements configured to cooperate between the annular sleeve and the connecting portion. In an embodiment, the threaded engagement requires at least two full turns to achieve locking engagement.

[0069] In an embodiment, the first anti-rotation portion 208 is formed as a notch, while the second anti-rotation portion 156 is formed as a convex projection dimensioned to engage the notch. Similarly, the third anti-rotation portion 214 may be a notch, and the fourth anti-rotation portion 160 may be a convex projection that plugs into the notch. The convex projections abut against the sidewalls of the corresponding notches when relative rotation is attempted, and the notch sidewalls thereby limit the displacement of the convex projections. This arrangement ensures effective limitation of relative rotation between the container cap 100 and the liquid storage container 200.

[0070] In an embodiment, the configuration may be reversed. Specifically, the second anti-rotation portion 156 may be formed as a notch, with the first anti-rotation portion 208 formed as a convex projection that engages the notch. Likewise, the fourth anti-rotation portion 160 may be formed as a notch, with the third anti-rotation portion 214 formed as a convex projection that engages the notch. The embodiments may be used independently or in combination. When both the first and second anti-rotation devices are provided in combination, the limiting effect on relative rotation between the container cap 100 and the liquid storage container 200 is maximized.

[0071] In an embodiment, the first anti-rotation portion 208 is configured as a convex projection, and the second anti-rotation portion 156 is likewise configured as a convex projection disposed to abut against the first anti-rotation portion 208. Similarly, the third anti-rotation portion 214 is formed as a convex projection, and the fourth anti-rotation portion 160 is configured as a convex projection abutting against the third anti-rotation portion 214.

[0072] Opening of the dual-locking mechanism is accomplished through rotation and removal of the container cap 100 relative to the liquid storage container 200. When the user applies reverse torque / force to the application head or outer surface of the container cap 100, the threaded engagement between the annular sleeve 154 of the container cap 100 and the connecting portion 206 of the liquid storage container 200 begins to disengage. During this motion, the second anti-rotation portion 156, initially seated within the first anti-rotation portion 208, is guided outward by the inclined or arcuate surface of the guide protrusion 212, thereby reducing resistance and providing tactile feedback. Likewise, the fourth anti-rotation portion 160 disengages from the third anti-rotation portion 214 by sliding along the guide wall 218, ensuring smooth release without excessive wear of the contacting surfaces.

[0073] As rotation continues, the threaded connection between the container cap 100 and the liquid storage container 200 is progressively loosened until fully disengaged, at which point the lid may be lifted axially to expose the liquid outlet 204 for dispensing or refilling. Because the dual anti-rotation structures are disposed on concentric radial positions, they disengage in a controlled sequence, which distributes stress evenly and extends the service life of the assembly. This arrangement provides the user with a clear sequence of resistance and release, thereby improving handling ergonomics, preventing accidental slippage, and maintaining sealing integrity until intentional opening is completed.

[0074] Referring to FIG. 5, in an embodiment, the container body 202 is integrally formed with a connecting portion 206, and a plurality of structural anti-rotation features are arranged along the periphery of the connecting portion 206. Specifically, a blocking convex portion 210 and a guide convex portion 212 are disposed in circumferentially spaced relation, and the gap formed therebetween defines the first anti-rotation portion 208. Additionally, the liquid storage container 200 is provided with third anti-rotation portions 214, which include a guide wall 218 and a blocking wall 216 to further enhance rotational restriction when engaged with the fourth anti-rotation portion 160 of the container cap.

[0075] The guide convex portion 212 is configured with an arcuate surface that facilitates the guided entry of the second anti-rotation portion 156 of the container cap 100. The blocking convex portion 210, positioned adjacent to the guide convex portion 212, provides a vertical stop surface that prevents further rotational displacement once the second anti-rotation portion 156 has been guided into position. The relative arrangement of these convex portions along the circumference ensures that the anti-rotation device is robust and resistant to unintended loosening.

[0076] Referring to FIG. 6, Point A, the structural relationship between the blocking convex portion 210, the guide convex portion 212, and the first anti-rotation portion 208 is shown. The radial height d1 of the guide convex portion 212 is less than the radial height d2 of the blocking convex portion 210, thereby establishing a stepped height difference. This step provides both a guided sliding path and a final stop, ensuring that the second anti-rotation portion 156 is first directed smoothly into position by the guide convex portion 212, and then securely locked by the blocking convex portion 210.

[0077] During assembly, as the container cap 100 is rotated relative to the liquid storage container 200, the second anti-rotation portion 156 is aligned with the gap between the guide convex portion 212 and the blocking convex portion 210. The arcuate edge of the guide convex portion 212 allows the second anti-rotation portion 156 to slide along its surface, while the elastic deformation of the guide convex portion 212 accommodates insertion. Once in place, further rotation brings the second anti-rotation portion 156 into abutment with the end face of the blocking convex portion 210, thereby preventing further rotational displacement. The stepped radial difference between d1 and d2 enhances both the locking effect and the tactile feedback perceived by the user.

[0078] Accordingly, the combination of the blocking convex portion 210, the guide convex portion 212, the first anti-rotation portion 208, and the third anti-rotation portions 214 with their respective guide wall 218 and blocking wall 216, provides a highly effective anti-rotation mechanism. The stepped relationship defined by d1 and d2 ensures precise engagement, secure locking, and enhanced sealing reliability.

[0079] Referring to FIGS. 3 to 6 and 8, in certain embodiments, the liquid storage container 200 is provided with a blocking convex portion 210 and a guide convex portion 212 arranged in circumferentially spaced relation along the periphery of the concentric circular path. The spacing between the blocking convex portion 210 and the guide convex portion 212 defines the first anti-rotation portion 208. The radial height d1 of the guide convex portion 212 is less than the radial height d2 of the blocking convex portion 210. The guide convex portion 212 is formed with an arcuate outer edge and is preferably made of a flexible or elastically deformable material.

[0080] During assembly, when the container cap 100 is rotated relative to the liquid storage container 200, the second anti-rotation portion 156 is guided into alignment with the gap formed between the guide convex portion 212 and the blocking convex portion 210. Under applied pressure, the guide convex portion 212 undergoes elastic deformation, allowing the second anti-rotation portion 156 to slide along its arcuate edge until it drops into the gap. Thereafter, if the container cap 100 continues to exert a rotational tendency, the second anti-rotation portion 156 abuts the end face of the blocking convex portion 210, which, owing to its greater radial height, prevents further rotational displacement. This configuration provides reliable rotational restriction between the liquid storage container 200 and the container cap 100. Moreover, during the sliding interaction between the second anti-rotation portion 156 and the guide convex portion 212, the user perceives a distinct deceleration caused by reactive force feedback, thereby providing a tactile indication that the second anti-rotation portion 156 is about to engage within the first anti-rotation portion 208.

[0081] In an embodiment, the first anti-rotation portion 208 is formed as a limiting groove recessed into the end surface of the liquid storage container 200, the groove having a bottom wall shaped as an inclined arcuate surface. In this case, when the second anti-rotation portion 156 enters the groove, it is guided to settle into the deepest part of the groove, thereby establishing a stable anti-rotation engagement.

[0082] In an embodiment, two sets of guide convex portions 212 and blocking convex portions 210 are provided in diametrically opposing positions along the circumference of the concentric circular path, thereby forming two corresponding first anti-rotation portions 208. Correspondingly, two second anti-rotation portions 156 are provided on the container cap 100 such that each engages with a respective first anti-rotation portion 208. This arrangement significantly increases the rotational limiting force, thereby enhancing the anti-rotation effect between the container cap 100 and the liquid storage container 200.

[0083] Furthermore, the liquid storage container 200 comprises a container body 202 and a connecting portion 206. The container body 202 defines a first surface on which a positioning boss 220 is formed. The connecting portion 206 is disposed on the positioning boss 220 and includes the liquid outlet 204. The peripheral side of the positioning boss 220 is provided with a notch defining the third anti-rotation portion 214. Specifically, the positioning boss 220 is disposed adjacent to the outer periphery of the container body 202, and the third anti-rotation portion 214 is formed as a notch on the outer circumferential wall of the positioning boss 220. When the container cap 100 is assembled, the fourth anti-rotation portion 160 engages within the notch such that the sidewall of the notch restricts rotational displacement of the container cap 100 relative to the liquid storage container 200. In another embodiment, the third anti-rotation portion 214 is formed as a limiting groove provided on the upper surface of the positioning boss 220, into which the fourth anti-rotation portion 160 is inserted to achieve the anti-rotation effect.

[0084] In an embodiment, the container cap 100 is provided with a mounting groove 158, the inner sidewall of which is formed with the fourth anti-rotation portion 160. The peripheral wall of the positioning boss 220 is dimensioned to be fitted against the sidewall of the mounting groove 158, thereby establishing contact engagement and further stabilizing the anti-rotation function.

[0085] In an embodiment, a mounting groove 158 is concavely formed at the bottom of the container cap 100, and a fourth anti-rotation portion 160 is disposed on the sidewall of the mounting groove 158. When the container cap 100 is assembled with the liquid storage container 200, the sidewall of the mounting groove 158 abuts the outer peripheral wall of the positioning boss 220, thereby enhancing the structural support of the container cap 100. Simultaneously, the fourth anti-rotation portion 160 engages with the third anti-rotation portion 214 to provide an anti-rotation effect. In this arrangement, the positioning boss 220 functions as a locating element, which stabilizes the container cap 100 and reduces wobbling after installation. The mounting groove 158 is dimensioned to fit over the upper end of the liquid storage container 200. In this embodiment, the mounting groove 158 is formed within a bracket 152, and the fourth anti-rotation portion 160 is provided as a convex feature on the inner sidewall of the bracket 152. The fourth anti-rotation portion may be formed as a wedge, peg, or similar projection dimensioned to fit within the triangular notch.

[0086] In an embodiment, the container cap 100 further comprises an annular sleeve 154 disposed concentrically within the mounting groove 158. The annular sleeve 154 is formed with an internal thread on its inner wall, while the liquid storage container 200 is provided with an external thread surrounding the liquid outlet 204. Both the internal and external threads are configured as double threads. The second anti-rotation portion 156 is disposed on the annular sleeve 154.

[0087] Specifically, in an embodiment, the liquid storage container 200 includes a connecting portion 206 disposed at the center of the positioning boss 220, the connecting portion 206 defining the liquid outlet 204. The connecting portion 206 is cylindrical and dimensioned to be received within the annular sleeve 154. The height of the annular sleeve 154 is such that it does not protrude beyond the bottom surface of the container cap 100. The annular sleeve 154 and the connecting portion 206 are threadedly coupled by the internal and external threads. Additionally, a second anti-rotation portion 156 is formed on the bottom wall of the annular sleeve 154. When the connecting portion 206 is fully threaded into the annular sleeve 154, the second anti-rotation portion 156 is positioned to engage with the first anti-rotation portion 208 of the connecting portion 206.

[0088] In the absence of the first anti-rotation device, prolonged use of the threaded connection may lead to wear and eventual failure of the threads. However, in this embodiment, when the threaded connection reaches its tightened position, the first anti-rotation portion 208 and the second anti-rotation portion 156 abut against one another to prevent further rotation of the container cap 100 relative to the liquid storage container 200. This configuration mitigates the risk of thread failure while also ensuring that the container cap 100 remains securely fastened to the liquid storage container 200. The use of double threads enables the container cap 100 to be tightened onto the connecting portion 206 from multiple angular positions, thereby improving the convenience and user experience. Moreover, positioning the second anti-rotation portion 156 on the bottom wall of the annular sleeve 154 also reinforces the structural strength of the annular sleeve 154.

[0089] In an embodiment, the connecting portion 206 is designed to be movably inserted into the annular sleeve 154. In this configuration, the sidewall of the annular sleeve 154 is provided with a magnetic attraction element, while a corresponding magnetic attraction element is disposed on the sidewall of the connecting portion 206. When the connecting portion 206 is inserted into the annular sleeve 154, the magnetic attraction elements engage to enhance the installation stability between the components.

[0090] Further, in an embodiment, the guide protrusions 212 and blocking protrusions 210 are arranged at the bottom of the connecting portion 206, beneath the external thread. Correspondingly, the second anti-rotation portion 156, which is disposed on the bottom wall of the annular sleeve 154, protrudes inwardly. Upon completion of the threaded connection, the second anti-rotation portion 156 engages with the first anti-rotation portion 208, thereby establishing the anti-rotation effect.

[0091] In an embodiment, four third anti-rotation portions 214 are provided, distributed along the same concentric circular path. Two of the third anti-rotation portions 214 are disposed along one radial direction, while the remaining two are disposed along another radial direction. Additionally, two fourth anti-rotation portions 160 are provided on the container cap 100, the two fourth anti-rotation portions 160 being positioned to correspondingly engage with any two of the third anti-rotation portions 214 located along the same radial direction. This configuration further enhances the anti-rotation performance of the assembly.

[0092] Referring to FIG. 7, in an embodiment, the arrangement of anti-rotation structures along concentric circular paths R1 and R2 relative to the central axis of the liquid outlet 204 is shown. The liquid storage container 200 is provided with a container body 202 that accommodates the liquid outlet 204. Around this central region, a first concentric circular path R1 and a second concentric circular path R2 are depicted. These concentric circular paths R1 and R2 are concentric with the central axis of the liquid outlet 204, and serve to define the relative radial positions of different anti-rotation engagement portions.

[0093] In particular, the first anti-rotation portion 208 is disposed along the inner circular path, first concentric circular path R1, closer to the central axis. This first engagement region provides a primary locking function by cooperating with a corresponding structure (such as a notch or groove) on the liquid storage container 200.

[0094] Outside of R1, the second concentric circular path R2, defines the position of another set of anti-rotation structures. The fourth anti-rotation portion 160, formed as a projection or convex body on the container cap 100, is positioned along this second radial distance from the central axis, and is configured to cooperate with a corresponding third anti-rotation portion 214 formed on the liquid storage container 200.

[0095] By arranging the first and third anti-rotation portions 208 and 214, along two concentric circular paths (R1, R2), the design enables a dual locking mechanism. The first locking structure, located closer to the central axis, restricts initial rotational movement, while the second locking structure, positioned radially outward, provides additional resistance to torque and stabilizes the container cap 100 in its mounted state. This dual arrangement effectively prevents loosening caused by repeated opening and closing, vibration, or external impact.

[0096] The arrows indicate the coordinate system for reference, wherein the upward direction corresponds to “Up,” the downward direction corresponds to “Down,” the left-hand side corresponds to “Left,” and the right-hand side corresponds to “Right.” This coordinate system is used to describe the relative circumferential arrangement of the anti-rotation portions along the concentric circular paths R1 and R2.

[0097] It is noted that the anti-rotation portions may be formed at multiple circumferential positions along R1 and R2. For example, in an embodiment, the first anti-rotation portion 208 is arranged at a specific angular position along R1, while the third anti-rotation portion 214 is circumferentially offset along R2, such that when the container cap is mounted, both portions engage with corresponding structures on the liquid storage container to provide multidirectional resistance against rotation.

[0098] The combination of two concentric circular paths (R1, R2) thus provides a two-level anti-rotation effect: the inner structure ensures precise alignment and initial positioning, whereas the outer structure enhances torque resistance and long-term stability, ensuring improved sealing reliability of the cosmetic container assembly.

[0099] Referring to FIG. 8, the engagement of one or more anti-rotation portions of the container cap 100 with the liquid storage container 200 is illustrated. The container cap 100 is provided with a second anti-rotation portion 156 and a fourth anti-rotation portion 160, while the liquid storage container 200 includes a first anti-rotation portion 208 and a third anti-rotation portion 214. These anti-rotation portions are arranged in complementary positions such that, when the container cap 100 is coupled to the container 200, rotational displacement of the container cap 100 relative to the liquid storage container 200 is effectively restricted.

[0100] In an embodiment, the second anti-rotation portion 156 of the container cap 100 is configured to interlock with the first anti-rotation portion 208 of the liquid storage container 200. Similarly, the fourth anti-rotation portion 160 engages with the third anti-rotation portion 214 of the container 200. This dual engagement creates a multi-point locking arrangement that distributes rotational resistance across concentric concentric circular paths, thereby enhancing structural stability and ensuring consistent closure even after repeated cycles of installation and removal.

[0101] The arrangement of the first and second anti-rotation portions 208 and 156 along a first concentric circular path (R1), and the third and fourth anti-rotation portions 214 and 160 along a second concentric circular path (R2), provides a coordinated locking mechanism. The cooperative action between these two sets of anti-rotation devices restricts relative rotation from multiple directions, thereby preventing loosening caused by vibration, handling, or torque applied during use. This concentric distribution also improves alignment during assembly, ensuring precise engagement and reliable sealing performance.

[0102] Furthermore, when the container cap 100 is rotated into its final position, the second anti-rotation portion 156 slides into engagement with the first anti-rotation portion 208, while the fourth anti-rotation portion 160 is guided into the third anti-rotation portion 214. This engagement produces both a physical lock and a tactile feedback response, enabling the user to sense that the container cap 100 has reached its fully secured position. The tactile feedback ensures ease of use and reduces the likelihood of incomplete closure or accidental misalignment.

[0103] Referring to FIGS. 7 and 8, in an embodiment, the first anti-rotation portion 208 and the third anti-rotation portion 214 are arranged on two different concentric circular paths, which are concentric about the central axis of the liquid outlet 204. A first concentric circular path R1 has a smaller radius than a second concentric circular path R2. The first anti-rotation portion 208 and the second anti-rotation portion 156 are distributed along the first concentric circular path R1, while the third anti-rotation portion 214 and the fourth anti-rotation portion 160 are distributed along the second concentric circular path R2.

[0104] In an embodiment, four third anti-rotation portions 214 are circumferentially distributed along the second concentric circular path R2. Two of the third anti-rotation portions 214 are positioned along one radial direction of the concentric circular path, while the other two are positioned along another radial direction. Two fourth anti-rotation portions 160 are correspondingly provided on the container cap 100. When the container cap 100 is assembled with the liquid storage container 200, the two fourth anti-rotation portions 160 engage with the two third anti-rotation portions 214 located along the same radial direction, thereby increasing the limiting force of the second anti-rotation device and further preventing relative rotation of the container cap 100 with respect to the liquid storage container 200.

[0105] In an embodiment, two-thirds of the anti-rotation portions 214 arranged along the same radial direction are symmetrically disposed with respect to the center of the concentric circular path. Each third anti-rotation portion 214 includes a guide wall 218 and a blocking wall 216. The fourth anti-rotation portion 160 is guided into the third anti-rotation portion 214 along the guide wall 218 and is then stopped by the blocking wall 216. Specifically, each third anti-rotation portion 214 is formed as a triangular notch recessed inwardly from the second concentric circular path R2. The adjacent sides of the triangular notch define the guide wall 218 and the blocking wall 216, which are configured with different lengths. During assembly, as the container cap 100 approaches its fully threaded position, the fourth anti-rotation portion 160 engages the guide wall 218 and slides along it until it abuts the blocking wall 216. Since the shape of the fourth anti-rotation portion 160 corresponds to the triangular notch, it becomes securely clamped when fully inserted. The fourth anti-rotation portion 160 may be formed as a wedge, peg, or similar projection dimensioned to fit within the triangular notch, thereby providing reliable engagement. Furthermore, due to the symmetrical arrangement about the circle center, each fourth anti-rotation portion 160 engages only with its corresponding third anti-rotation portion 214, preventing misalignment or incorrect insertion. This arrangement provides a stable and secure connection, reducing the likelihood of disengagement and further enhancing the anti-rotation performance between the container cap 100 and the liquid storage container 200.

[0106] In an embodiment, the first anti-rotation device and the second anti-rotation device are positioned along different radial directions of the concentric circular paths. Specifically, the first anti-rotation device is arranged along a diameter of the first concentric circular path R1, while the second anti-rotation device is arranged along a diameter of the second concentric circular path R2. The two diameters are offset from one another by a predetermined angle. In such a configuration, the first anti-rotation portion 208 and the second anti-rotation portion 156 are disposed along the left-right direction of the concentric circular path, whereas the third anti-rotation portion 214 and the fourth anti-rotation portion 160 are disposed along the up-down direction of the concentric circular path. This arrangement restricts the rotational freedom of the container cap 100 from four different directions, thereby further preventing relative rotation between the container cap 100 and the liquid storage container 200. Moreover, the first anti-rotation device and the second anti-rotation device may alternatively be arranged along the same radial direction of the concentric circular path.

[0107] Referring to FIG. 9, in an alternate embodiment, an improved container assembly is provided that is particularly suitable for applications in which the container cap / applicator head 100 comprises a main body 150 and a base 120, which is subjected to rotational manipulation during use, while the base 120 is fixed to the liquid storage container 200. This mechanism secures the lower base 120 relative to the main body 150. As a result, the liquid storage container 200 is maintained in a stable condition, the risk of unintentional loosening is reduced, and a consistent and reliable sealing performance is achieved even during repeated handling or one-handed operation.

[0108] In an embodiment, where the container cap 100 is provided with the main body 150 that must be rotated or otherwise manipulated by the user during dispensing or closure, while the lower base 120 or liquid storage container 200 remains securely restrained. For example, in cosmetic or skincare product dispensing applications, the user applies torque / rotational force to the main body 150 in order to selectively open or close a liquid outlet 204 of the liquid storage container 200. In such cases, the dual anti-rotation locking mechanism prevents the lower base 120 or liquid storage container 200 from rotating together with the main body 150, thereby preserving positional stability, preventing disengagement or loosening of the threaded or equivalent coupling, and ensuring a uniform sealing force over repeated cycles of use. The lower base 120 only detaches from the liquid storage container 200 when certain external force is applied on lower base 120 in reverse direction.

[0109] In an embodiment, the structural components for the dual-locking mechanism may alternatively be provided on the base 120. For example, the annular sleeve 154 can be provided at the bottom of the base 120 to receive the anti-rotating portions of the liquid storage container 200. Similarly, the second anti-rotation portion 156 and the fourth anti-rotation portion 160 provided on the base 120 of the container cap 100, such as notches, grooves, recesses, protrusions, or blocking walls, cooperate with the complementary first anti-rotation portion 208 and third anti-rotation portion 214 of the liquid storage container 200 to restrict relative rotation. In this arrangement, the functional engagement between the container cap 100, main body 150 and the base 120 remains substantially the same, ensuring restricted relative rotation, stable sealing engagement, and consistent user feedback. This variation illustrates the versatility and modularity of the design, permitting either the container cap 100 or the base 120 to incorporate the annular sleeve 154, anti-rotation portions, guides, grooves, tactile feedback features, or other connection elements without departing from the scope of the invention.

[0110] The present invention provides the structural features and functional advantages of the cosmetic container assembly equipped with the dual anti-rotation locking mechanism. By integrating complementary anti-rotation portions between the container and the application head, the invention provides enhanced rotational stability, secure sealing performance, and improved user convenience over conventional closure systems. The configuration effectively prevents leakage, contamination, and premature loosening, thereby extending the shelf life and usability of liquid formulations. Owing to its modular design and compatibility with various applicator heads, the invention is suitable for widespread industrial application in the cosmetics and personal care sector, as well as in related fields such as pharmaceuticals and dermatological products. Accordingly, the invention not only improves product reliability and consumer safety but also provides manufacturers with a scalable and durable packaging solution adaptable to diverse liquid-based formulations.

[0111] Various modifications to these embodiments are apparent to those skilled in the art, from the description and the accompanying drawings. The principles associated with the various embodiments described herein may be applied to other embodiments. Therefore, the description is not intended to be limited to the embodiments shown along with the accompanying drawings but is to provide the broadest scope consistent with the principles and the novel and inventive features disclosed or suggested herein. Accordingly, the invention is anticipated to hold on to all other such alternatives, modifications, and variations that fall within the scope of the present invention and appended claims.

Claims

1. A container assembly comprising:a liquid storage container having a liquid outlet;a container cap detachably connected to the liquid storage container;a first anti-rotation portion formed on the liquid storage container and a cooperating second anti-rotation portion formed on the container cap, the first and second anti-rotation portions being disposed along a first concentric circular path with the liquid outlet; anda third anti-rotation portion formed on the liquid storage container and a cooperating fourth anti-rotation portion formed on the container cap, the third and fourth anti-rotation portions being disposed along a second concentric circular path with the liquid outlet and having a radius greater than that of the first concentric circular path;wherein engagement between the first and second anti-rotation portions and engagement between the third and fourth anti-rotation portions collectively limit rotational movement of the container cap relative to the liquid storage container.

2. The container assembly of claim 1, wherein the first anti-rotation portion comprises a notch and the second anti-rotation portion comprises a protrusion configured to engage with the notch, and / or the third anti-rotation portion comprises a notch and the fourth anti-rotation portion comprises a protrusion configured to engage with the notch.

3. The container assembly of claim 1, wherein the liquid storage container includes a guide protrusion and a blocking protrusion spaced apart along a circumference of the first concentric circular path, a space between the guide protrusion and the blocking protrusion forming the first anti-rotation portion, the guide protrusion having a radial projection height less than a radial projection height of the blocking protrusion.

4. The container assembly of claim 1, wherein the liquid storage container comprises a container body and a connecting portion, the container body including a first surface with a positioning boss, the connecting portion being disposed on the positioning boss and including the liquid outlet, the positioning boss having a circumferential notch constituting the third anti-rotation portion.

5. The container assembly of claim 1, wherein the annular sleeve of the container cap includes an internal thread, the liquid storage container includes an external thread surrounding the liquid outlet and mating with the internal thread, both the internal and external threads being double-start threads, the second anti-rotation portion being disposed on the annular sleeve.

6. The container assembly of claim 1, wherein the annular sleeve is positioned centrally within a mounting groove of the container cap and does not protrude from a bottom surface of the container cap.

7. The container assembly of claim 1, wherein the second anti-rotation portion protrudes downward from the annular sleeve to engage a corresponding recess of the first anti-rotation portion.

8. The container assembly of claim 1, wherein four third anti-rotation portions are disposed on the second concentric circular path, two of the third anti-rotation portions being aligned in a first radial direction, and two of the third anti-rotation portions being aligned in a second radial direction, and wherein two fourth anti-rotation portions are provided on the container cap, each of the two fourth anti-rotation portions engaging with two of the third anti-rotation portions located along a same radial direction.

9. The container assembly of claim 8, wherein the two third anti-rotation portions in the same radial direction are symmetrically arranged with respect to a center of the second concentric circular path, each third anti-rotation portion including a guide wall and a blocking wall, the fourth anti-rotation portion being guided into the third anti-rotation portion by the guide wall and abutting against the blocking wall.

10. The container assembly of claim 1, wherein the third anti-rotation portion comprises a triangular notch recessed inward and defined by a guide wall and a blocking wall, and the fourth anti-rotation portion comprises a projection guided into the triangular notch and abutting the blocking wall.

11. The container assembly of claim 1, wherein the first and second anti-rotation portions are disposed along a first radial direction of the first concentric circular path, and the third and fourth anti-rotation portions are disposed along a second radial direction of the second concentric circular path, the first and second radial directions being different from one another.

12. The container assembly of claim 11, wherein the first radial direction and the second radial direction are substantially perpendicular to one another.

13. The container assembly of claim 11, wherein the first radial direction and the second radial direction are angularly offset relative to one another.

14. A container cap for use with a liquid storage container having a liquid outlet, the container cap comprising:an annular sleeve configured to connect to the liquid outlet by at least one of a threaded engagement or a magnetic engagement;a mounting groove formed on a bottom surface of the container cap, the mounting groove including a fourth anti-rotation feature positioned to engage with a corresponding third anti-rotation feature of the liquid storage container; anda second anti-rotation feature positioned on an inner surface of the annular sleeve and adapted to engage with a corresponding first anti-rotation feature of the liquid storage container;wherein the mounting groove and the annular sleeve cooperate to prevent relative rotation between the container cap and the liquid storage container upon connection.

15. The container cap of claim 14, wherein the mounting groove includes side walls provided with the fourth anti-rotation feature, the circumferential side of a positioning boss of the liquid storage container being adapted to and in contact with the side walls of the mounting groove.

16. The container cap of claim 14, wherein the annular sleeve includes an internal thread and the liquid storage container includes an external thread surrounding the liquid outlet, the internal and external threads being double-start threads, the second anti-rotation feature being disposed on the annular sleeve.

17. The container cap of claim 14, wherein the second anti-rotation feature comprises a protrusion projecting inwardly from the annular sleeve, and the fourth anti-rotation feature comprises a protrusion projecting inwardly from the mounting groove.

18. The container cap of claim 14, wherein the annular sleeve and the connecting portion of the liquid storage container include cooperating magnetic elements that magnetically secure the container cap to the liquid storage container.

19. A method of securing a container cap to a liquid storage container, the method comprising:aligning the container cap with a liquid outlet of the liquid storage container;engaging an annular sleeve of the container cap with a connecting portion of the liquid storage container;rotating or inserting the container cap until a second anti-rotation feature of the container cap engages with a corresponding first anti-rotation feature of the liquid storage container located along a first concentric circular path with the liquid outlet;further positioning the container cap until a fourth anti-rotation feature of the container cap engages with a corresponding third anti-rotation feature of the liquid storage container located along a second concentric circular path with the liquid outlet; andthereby limiting rotational displacement of the container cap relative to the liquid storage container and improving sealing performance of the container assembly.

20. The method of claim 19, further comprising sensing a tactile resistance when the second anti-rotation feature engages with the first anti-rotation feature and / or when the fourth anti-rotation feature engages with the third anti-rotation feature, thereby providing user feedback of secure attachment.

Images