can lid

Abstract

A can lid includes a lid body and at least one protrusion. The lid body includes an annular wall and a cover plate. The annular wall is connected to the periphery of the cover plate and extends downward from the periphery of the cover plate. The at least one protrusion is connected to the periphery of the cover plate and extends upward from the periphery of the cover plate in a direction away from the annular wall. This strengthens the structure at the connection between the cover plate and the annular wall, preventing deformation of the can lid during injection molding, thus improving the manufacturing yield of the can lid. It also forms a barrier to prevent the can lid from overlapping with another inverted can lid, thereby improving the efficiency of automated assembly.

Description

[Technical Field]

[0001] This invention relates to can lids; in particular, it refers to a can lid that can improve the efficiency and yield of automated assembly. [Previous Technology]

[0002] It is known that the purpose of a can lid is to seal a container, such as a common metal can or plastic can. By connecting the can lid to the opening of the container, the contents of the container are prevented from leaking out of the opening. A conventional can lid includes a cover plate and an annular wall connected to the periphery of the cover plate.

[0003] The process of manufacturing containers with lids usually involves first using injection molding technology to manufacture the lids, then conveying the finished lids via a conveyor belt, and finally assembling the lids onto the containers by machinery. However, because a large number of lids are placed on the conveyor belt at the same time, it is easy for adjacent lids to overlap during the conveying process. At this time, since the periphery of one lid is blocked by the periphery of another lid, the machinery may not be able to smoothly pick up the lower lid, thus reducing the efficiency of automated assembly. In addition, since the structure of the connection between the lid and the ring wall is relatively fragile, during the manufacturing process of injection molding the lid with plastic, the connection between the lid and the ring wall is easily deformed when the lid is ejected from the mold, resulting in a decrease in the yield of the lid manufacturing.

[0004] As shown in Figures 1 and 2, a conventional can lid 100' includes a cover plate 10', which includes a protrusion 11', a circumferential surface 12' and an annular wall 13'. The circumferential surface 12' is formed between the protrusion 11' and the annular wall 13'. When the can lid 100' is assembled onto a container 1, and multiple containers 1 with the can lid 100' are packaged with packaging materials, such as shrink film, these containers 1 with the can lid 100' are squeezed and arranged tightly by the packaging materials. If the can lid 100' is misaligned with another adjacent can lid 100', at this time, part of the annular wall 13' is located above another circumferential surface 12'. The circumferential surface 12' of the lower can lid 100' can easily push up the upper annular wall 13', causing the upper can lid 100' to move upward or even detach from the container 1.

[0005] Therefore, how to provide a can lid that improves the efficiency and yield of automated assembly is an urgent problem to be solved. [Summary of the Invention]

[0006] In view of this, the object of the present invention is to provide a can lid that strengthens the structure of the connection between the lid and the ring wall through the protrusion, and can form a barrier so that the can lids cannot easily overlap.

[0007] In order to achieve the above objectives, the present invention provides a can lid comprising a lid body and at least one protrusion, wherein the annular wall is connected to the periphery of the lid plate and the annular wall extends downward from the periphery of the lid plate; the at least one protrusion is respectively connected to the periphery of the lid plate, and the at least one protrusion extends upward from the periphery of the lid plate in a direction away from the annular wall.

[0008] The effect of the present invention is that, through the design of at least one protrusion of the can lid, the structure of the connection between the lid and the ring wall can be strengthened, so that the can lid is prevented from deformation caused by the force of the ejection during the manufacturing process, thereby improving the manufacturing yield of the can lid, and can form a barrier so that the can lid cannot easily overlap with another can lid, making it easier for the machine to obtain the can lid located on the conveyor belt, thereby improving the efficiency of automated assembly. In addition, when the can lids are closely arranged, if the can lid is in a vertically misaligned state with another adjacent can lid, the can lid is not easily pushed up by the adjacent can lid.

Implementation Method

[0009] To more clearly illustrate the present invention, preferred embodiments are described in detail below with reference to the accompanying drawings. Please refer to Figures 3 and 4, which show a can lid 100 of the first preferred embodiment of the present invention. The can lid 100 is used to seal the opening of a container (not shown). The can lid 100 includes a lid body 10 and at least one protrusion 20. In this embodiment, the can lid 100 is manufactured by injection molding technology, and the shape of the can lid 100 is circular for example. In other embodiments, the shape of the can lid 100 may also be rectangular or other shapes.

[0010] The cover 10 includes a cover plate 11 and an annular wall 12. The cover plate 11 is a plate, and the annular wall 12 is connected to the periphery of the cover plate 11 and is formed by extending downward from the periphery of the cover plate 11.

[0011] In this embodiment, the number of at least one protrusion 20 is one. The protrusion 20 is connected to and surrounds the periphery of the cover plate 11. The protrusion 20 extends upward from the periphery of the cover plate 11 in a direction away from the annular wall 12. The protrusion 20 has a top surface 21, and the annular wall 12 has a bottom surface 121. The bottom surface 121 of the annular wall 12 and the top surface 21 of the protrusion 20 are vertically and horizontally corresponding. The protrusion 20 can strengthen the structure of the connection between the cover plate 11 and the annular wall 12, so that the can lid 100 is prevented from being deformed by the force applied during the manufacturing process, thereby improving the manufacturing yield of the can lid 100. It can also form a barrier so that the can lid 100 cannot easily overlap with another can lid 100, making it easier for the machine to pick up the can lid 100 located on the conveyor belt, thereby improving the efficiency of automated assembly.

[0012] As shown in FIG5, in another embodiment, the number of at least one protrusion 20 is two, but not limited thereto. In other embodiments, the number of at least one protrusion 20 may also be three or more; wherein, the shape of each protrusion 20 is a C-shaped block, but not limited thereto. When the cover 10 is rectangular, each protrusion 20 may also be a U-shaped or other shape, as long as the shape of each protrusion 20 corresponds to the shape of the periphery of the cover plate 11. The two protrusions 20 surround the opposite sides of the periphery of the cover plate 11, and two gaps S are formed between the ends of the two protrusions 20.

[0013] Please refer to Figures 6 and 7 for a can lid 200 of the second preferred embodiment of the present invention. The can lid 200 has a central axis L defined in the center. The can lid 200 includes a lid body 30 and at least one protrusion 40. The lid body 30 includes a cover plate 31 and an annular wall 32. The cover plate 31 has an upwardly protruding protrusion 311 in the middle. The protrusion 311 has a top surface 311a. The periphery of the protrusion 311 is connected to the inner periphery of an annular portion 312. The outer periphery of the ring portion 312 is connected to the ring wall 32. The ring portion 312 has a ring top surface 312a. The ring wall 32 is connected to the periphery of the cover plate 31, and the ring wall 32 is formed by extending downward from the periphery of the cover plate 31. At least one protrusion 40 extends upward from the periphery of the cover plate 31 in a direction away from the ring wall 32. The at least one protrusion 40 is connected to the outer periphery of the ring portion 312. The at least one protrusion 40 has at least one protrusion top surface 41. The bottom surface 321 of the annular wall 32 corresponds vertically to the top surface 41 of the protrusion of the at least one protrusion 40. The distance along the central axis L between the outer periphery of the top surface 311a of the protrusion and the top surface 312a of the annular portion has a first height H1, and the distance along the central axis L between the top surface 312a of the annular portion and the bottom surface 321 of the annular wall 32 has a second height H2. The top surface 41 of each protrusion 40 corresponds to the bottom surface 321 of the annular wall 32. The distance between them along the central axis L has a third height H3, the first height H1 is greater than the second height H2, and the third height H3 is greater than 0.5 times the sum of the first height H1 and the second height H2. In this embodiment, the number of the at least one protrusion 40 is one, but it is not limited thereto; the top surface 312a of the ring portion is a plane (i.e., the inner periphery of the top surface 312a of the ring portion and the outer periphery of the top surface 312a of the ring portion are at the same height along the central axis L). In other preferred embodiments, the number of the at least one protrusion 40 may be two or more; the top surface 312a of the ring portion may be an inclined surface (i.e., the height of the inner periphery of the top surface 312a of the ring portion along the central axis L is higher or lower than the outer periphery of the top surface 312a of the ring portion).

[0014] Please refer to Figure 8, which shows a can lid 300 according to a third preferred embodiment of the present invention. The can lid 300 has a central axis L defined at its center. The can lid 300 includes a lid body 50 and at least one protrusion 60. The lid body 50 includes a cover plate 51 and an annular wall 52. The cover plate 51 of the lid body 50 has a protruding top surface 511 and a circumferential surface 512. The height of the protruding top surface 511 along the central axis L is higher than the height of the circumferential surface 512 along the central axis L. The periphery of 11 is connected to the inner periphery of the peripheral surface 512, and the outer periphery of the peripheral surface 512 is connected to the annular wall 52. In this embodiment, the peripheral surface 512 is a slope. In other embodiments, the cross-section of the peripheral surface 512 may be arc-shaped. The annular wall 52 is connected to the periphery of the cover plate 51, and the annular wall 52 is formed by extending downward from the periphery of the cover plate 51. The at least one protrusion 60 extends upward from the periphery of the cover plate 51 in a direction away from the annular wall 52. Connected to the outer periphery of the peripheral surface 512, the at least one protrusion 60 has a protrusion top surface 61. The bottom surface 521 of the annular wall 52 corresponds vertically to the top surface 61 of the at least one protrusion 60. The distance between the top surface 511 of the protrusion and the outer periphery of the peripheral surface 512 along the central axis L has a fourth height H4, and the distance between the outer periphery of the peripheral surface 512 and the bottom surface 521 of the annular wall 52 along the central axis L has a fifth height H5. The distance between the top surface 61 of each protrusion 60 and the bottom surface 521 of the annular wall 52 along the central axis L has a sixth height H6. The fourth height H4 is greater than the fifth height H5, and the sixth height H6 is greater than 0.5 times the sum of the fourth height H4 and the fifth height H5. In this embodiment, the number of at least one protrusion 60 is one, but it is not limited thereto. In other preferred embodiments, the number of at least one protrusion 60 may be two or more.

[0015] In summary, by designing at least one protrusion on the can lid, the structure of the connection between the lid and the ring wall can be strengthened. During the production of the can lid, when the can lid is ejected from the injection molding mold, the ejection force can be avoided to prevent deformation of the can lid, thereby improving the yield of the can lid. In addition, during the conveyor belt transport of the can lid, the can lid on the conveyor belt is less likely to be stacked with another can lid, making it easier for the machine to obtain the can lid on the conveyor belt, thereby improving the automated assembly efficiency of the can lid. Furthermore, when the can lid is assembled into a container, and multiple containers with the can lid are packaged with packaging materials, such as shrink film, the containers with the can lid are squeezed and arranged tightly by the packaging materials. If the can lid and another adjacent can lid are in a vertically misaligned state, the can lid is less likely to be pushed up by the adjacent can lid because the ring wall is blocked by the at least one protrusion of the adjacent can lid.

[0016] The above description is only a preferred embodiment of the present invention. Any equivalent changes made by applying the present invention specification and the claims should be included within the patent scope of the present invention. [Simplified Explanation of the Diagram]

[0017] Figure 1 is a schematic diagram of a prior art can lid and container. Figure 2 is a schematic diagram of a prior art can lid and container. Figure 3 is a top view of a can lid according to a first preferred embodiment of the present invention. Figure 4 is a front view of a can lid according to a first preferred embodiment of the present invention. Figure 5 is a top view of a can lid according to another preferred embodiment of the present invention. Figure 6 is a top view of a can lid according to a second preferred embodiment of the present invention. Figure 7 is a front view of a can lid according to a second preferred embodiment of the present invention. Figure 8 is a front view of a can lid according to a third preferred embodiment of the present invention.

Claims

1. A can lid, comprising: a lid body including a cover plate and an annular wall, the annular wall being connected to the periphery of the cover plate and extending downward from the periphery of the cover plate, the annular wall having a bottom surface; at least one protrusion being respectively connected to the periphery of the cover plate, the at least one protrusion extending upward from the periphery of the cover plate in a direction away from the annular wall, the at least one protrusion having a top surface, the bottom surface of the annular wall and the top surface of the at least one protrusion corresponding vertically to strengthen the structure of the connection between the cover plate and the annular wall.

2. The can lid as claimed in claim 1, wherein the lid is a plate, and the at least one protrusion includes two protrusions, each of the protrusions being a C-shaped block, forming two gaps between the two protrusions.

3. The can lid as claimed in claim 1, wherein the lid has an upwardly projecting protrusion, the periphery of which is connected to a ring, the outer periphery of which is connected to the ring wall; the protrusion has a top surface, the ring has a top surface; and the at least one protrusion is connected to the periphery of the ring.

4. The can lid as claimed in claim 3, wherein a central axis is defined in the can lid, the distance along the central axis between the top surface of the protrusion and the outer periphery of the top surface of the ring has a first height, the distance along the central axis between the top surface of the ring and the end edge of the ring wall opposite to the direction of the lid has a second height, and the first height is greater than the second height.

5. The can lid as claimed in claim 4, wherein the distance between each of the protrusions and the end edge of the annular wall opposite to the direction of the lid body along the central axis has a third height, the third height being greater than 0.5 times the sum of the first height and the second height.

6. The can lid as claimed in claim 1, wherein a central axis is defined in the can lid, the lid plate has a convex top surface and a circumferential surface, the height of the convex top surface along the central axis is higher than the height of the circumferential surface along the central axis, the periphery of the convex top surface is connected to the inner periphery of the circumferential surface, the outer periphery of the circumferential surface is connected to the annular wall, and the at least one protrusion is connected to the outer periphery of the circumferential surface.

7. The can lid as claimed in claim 6, wherein the distance along the central axis between the top surface of the protrusion and the outer periphery of the circumferential surface has a fourth height, and the distance along the central axis between the outer periphery of the circumferential surface and the end edge of the annular wall facing away from the lid body has a fifth height, the fourth height being greater than the fifth height.

8. The can lid as claimed in claim 7, wherein the distance between each of the protrusions and the end edge of the annular wall opposite to the direction of the lid body along the central axis has a sixth height, the sixth height being greater than 0.5 times the sum of the fourth height and the fifth height.

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