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.

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; and   a 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; and   a 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; and   thereby 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.