Patent Application
20240002128
The disclosure relates to a container lid, more specifically to a container lid that automatically opens its vent holes with the rise of pressure in a container.
Containers for storing and cooking food have various shapes and sizes. Such containers usually accompany matching lids sized and structured to cover and seal the container. With the advent of microwave ovens, food may be placed in a microwavable container for cooking in the microwave oven, and left over food may be stored in the same container in a refrigerator. The food may be cooked in a microwave, placed in a refrigerator for storage, and subsequently removed from the refrigerator and placed in the microwave for reheating. The containers are generally closed by lids during storage to prevent spilling of its content or entering of contaminants into the containers. The lids are then removed from the containers before placing the containers in the microwave ovens to present buildup of excessive pressure within the containers.
Embodiments relate to a container lid for sealing a container that automatically vents air or vapor when pressure within the container exceeds a threshold. The container lid includes a flange, a lower portion and an upper portion. The flange attaches onto a top end of the container. The lower portion extends inward and downward from the flange. The upper portion includes a top portion and a peripheral portion between the top portion and the flange. The peripheral portion is switchable between a first state where the peripheral portion is deformed upward to raise the top portion from the lower portion, and a second state where the peripheral portion is deformed downward to lower the top portion onto the lower portion. The peripheral portion is formed with one or more vent holes that are blocked by the lower portion in the second state but opened in the first state.
In one or more embodiments, the lower portion and the peripheral portion are separated in the first state and the lower portion contacts the peripheral portion in the second state.
In one or more embodiments, the peripheral portion switches from the second state to the first state when pressure within the container rises above a threshold.
In one or more embodiments, at least the peripheral portion is made of a flexible material.
In one or more embodiments, the flange, the lower portion and the upper portion are integrated as a single body.
In one or more embodiments, the upper portion is bistable at the first state and the second state.
In one or more embodiments, an inner end of the lower portion define a hole open towards the container.
In one or more embodiments, the peripheral portion is connected to the flange via a connection region having a thickness thinner than the peripheral portion and the flange.
In one or more embodiments, the thickness of the peripheral portion at a second part connected to the top portion is thicker than at the first part.
In one or more embodiments, the flange includes an annular body extending outwards and a hook. The hook has an inner rib and an inner groove that sealingly engage the container.
Embodiments also relate to a method of operating a container lid. One or more vent holes formed in a peripheral portion of an upper portion of a container lid are blocked by deforming the peripheral portion downward so that the peripheral portion is lowered onto a lower portion of the container lid that extends inward and download from a flange of the container lid that attached onto a top of the container. When pressure within a container attached with the container lid is increased above a threshold, the vent holes are unblocked by deforming the peripheral portion upward so that the peripheral portion is detached from the lower portion of the container lid. The pressure within the container is relieved by venting air or vapor through the unblocked one or more vent holes.
In one or more embodiments, the vent holes are blocked by having the lower portion contact the peripheral portion. The vent holes are unblocked by separating the lower portion and the peripheral portion.
In one or more embodiments, pressing force on a top portion of the upper portion is received to block the one or more vent holes by deforming the peripheral portion.
Embodiments also relate to a container assembly including the container and the container lid.
Embodiments are described herein with reference to the accompanying drawings. Principles disclosed herein may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. In the description, details of well-known features and techniques may be omitted to avoid unnecessarily obscuring the features of the embodiments. In the drawings, like reference numerals in the drawings denote like elements. The shape, size and regions, and the like, of the drawing may be exaggerated for clarity.
Embodiments relate to a container lid with vent holes that are blocked for storage but automatically unblocked when a container attached to the container lid is heated. The heating of the container lid causes the pressure to build in the container, which pushes up an upper portion of the container lid. When the upper portion of the container lid is pushed up, the vent holes are unblocked and enables air or vapor to escape through the vent holes. In this way, the container lid may seal the container during storage but enable automatic venting during the heating of the container to prevent buildup of excessive pressure within the container. The container lid is advantageous, among other reasons, because it is simple to use, has a unitary structure for easy manufacturing, and has a reliable and simple structure that is not susceptible to damage during everyday uses.
The container lid according to embodiments may be assembled onto the container for containing food items. After placing the food items in the container, the container lid may be sealed onto the container by fitting the container lid onto a top opening of the container, and then pushing down a top portion of the container lid. Such pushing action deforms a peripheral portion of the container lid, blocking vent holes in the peripheral portion, and thereby prevents contaminants from entering the container through the vent holes. The container sealed with the container lid may be stored (e.g., in a refrigerator). For consumption of the food item after storage, the container may be heated (e.g., using a microwave oven) with the container lid on. The heating of the food item increases the pressure within the container and pushes up the top portion of the container lid when the built-up pressure exceeds a threshold. In this way, the vent holes are automatically unblocked to release air and vapor from the container.
The container lid 110 is dimensioned to fit onto the container 120 and seal the container 120. For this purpose, the container lid includes a flange 108, and an upper portion 112. The upper portion 112 includes a top portion 142 and a peripheral portion 106 between the flange 108 and the top portion 142. The peripheral portion 106 and the flange 108 are connected via a connection region 152 that is thinner to function as a scoring line relative to which the peripheral portion 106 is flexed. The flange 108 fits onto the container 120, as described below in detail with reference to
The top portion 142 is at the highest location when the container lid 110 is in a popped up state (e.g., a first state), as shown in
The peripheral portion 106 is flexible and has a bistable configuration where in one state (e.g., the first state), the top portion 142 is popped up, and in the other state (e.g., the second state), the top portion 142 is pushed down. The peripheral portion 106 may be made of a material and of a thickness profile that causes the peripheral portion 106 to deform between the two states when a certain amount of force or pressure is applied to the container lid 110. The peripheral portion 106 is formed with vent holes 104 that penetrate the peripheral portion 106. These vent holes 104 are blocked or unblocked depending on the state of the peripheral portion 106, as described below in detail with reference to
The container lid 110 may be of a unitary structure made of the same material. For example, the entire container lid 110 may be made of silicone with different thickness at different parts of the container lid. In this way, the entire container lid 110 may be fabricated using a single injection molding process without involving separate assembling of parts. Alternatively, the top portion 142 and the flange 108 may be made of a solid material (e.g., plastic) whereas the peripheral portion 106 is made of a flexible material (e.g., silicone).
When the container 120 is heated, the expanded gas or vapor passes through the hole 432 and applies pressure to the top portion 142 and the peripheral portion 106 of the container lid 110 so that the top portion 142 is popped up automatically.
The flange 108 of the container lid 110 removably secures the container lid 110 onto the container 120. The flange 108 may include, among other components, an annular body 412 connected to the peripheral portion 106 and the lower portion 402 and a hook 414 having an inner rib 416. The hook 414 is formed with an inner groove 418 at a surface facing the side wall of the flange 108.
The container 120 has an externally protruding rim 420 at its top rim. When the container lid 110 is pushed down for assembly onto the container 120, the hook 414 deforms outward followed by latching of the hook 414 onto the protruding rim 420. That is, the protruding rim 420 is inserted into the inner groove 418 and the inner rib 416 engages the bottom portion of the protruding rim 420 to lock the container lid 110 onto the container 120. In order to disassemble the container lid 110 from the container 120, the container lid 110 is pulled from the container 120. This causes the hook 414 to deform and release the protruding rim 420 from the inner groove 418.
The connection region 106 may have a thickness t2 that is thinner than the peripheral portion and the lower portion 402 (having a thickness t1). The connection region 106 defines an area where most of the deformation occurs when the peripheral portion 106 is deformed downward to contact the lower portion 402 so that the vent holes 104 are fully blocked when the peripheral portion 106 is deformed downward. Further, the peripheral portion 106 may have a thickness profile that varies from a location where it is connected to the connection region 106 and another location where it is connected to the top portion 142.
Although the container 120 and the container lid 110 are described herein as using the structure of protruding rim 420 and the inner groove 418 to secure the container lid 110 onto the container 120, various other mechanisms such as screws or solid latches may be used to secure the container lid 110 onto the container 120.
The container 120 may then be retrieved from storage and be heated (e.g., by a microwave oven) for consumption. The heating of the food item increases 620 the pressure within the container 120. When the pressure exceeds a threshold, the peripheral portion 106 deforms and pops the top portion 142. In this way, the peripheral portion 106 is detached from the lower portion 402 of the container lid 110 and unblocks 630 the vent holes 104. Such deformation of the peripheral portion 106 occurs automatically when the pressure within the container 120 exceeds the threshold, and does not involve any manual operation by the user other than heating the container 120.
As the vent holes 104 are unblocked, the pressure within the container 120 is relieved 640 by venting air or vapor through the unblocked vent holes. In this way, building up of excess pressure within the container may be prevented.
Although the present disclosure has been described above with respect to several embodiments, various modifications can be made within the scope of the disclosure. Accordingly, the disclosure described above is intended to be illustrative, but not limiting.
