Composite Container Lid Sound-Suppressing Protrusion
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Solution Overview
Problem
The existing composite container lids often experience defective closing and generate noise during resealing due to abrupt collisions between the outer and inner lids, leading to incomplete sealing, as consumers mistakenly believe the lid is fully closed when sounds are produced.
Innovation Solution
The design incorporates a sound-suppressing protrusion on the inner surface of the upper lid, which adjusts the distance between the upper lid engaging cylinder and the top plate, preventing abrupt descent and contact between screw threads, thereby suppressing noise and ensuring complete closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer lid is descended by being turned in the closing direction during resealing, then the upper end of the pole-like protrusion enters into the annular protrusion and engagement occurs, but the undercut moves over the upper end of the protrusion causing abrupt descent and sound generation leading to defective closing
Solution Approach 1:
A cushioning protrusion is provided on the inner surface of the top plate of the outer lid. This protrusion contacts the upper end surface of the upper lid engaging cylinder before the undercut of the engaging pieces moves over the pole-like protrusion, cushioning the abrupt descent of the outer lid and preventing sound generation that would indicate defective closing to the consumer
2Reliability
If the gap between the screw thread and container mouth portion is reduced to eliminate sound, then the lid may be difficult to close or may require excessive force
Solution Approach 1:
The cushioning protrusion provides prior cushioning to the abrupt descent caused by undercut engagement, eliminating the need to reduce the screw thread gap. This maintains ease of operation while preventing sound generation, as the cushioning protrusion absorbs the shock before the screw threads engage fully
Solution Approach 2:
The cushioning protrusion acts as an intermediary element between the outer lid and the upper lid engaging cylinder. It mediates the engagement process by providing gradual contact and cushioning the abrupt descent, allowing the screw threads to engage smoothly without generating harmful sounds
Data Source
Figure 1
Figure 2(a)~2(c)
Figure 3(a)~3(c)
AI summary
A composite container lid comprising an inner plug 1 with a flow-out port and an upper lid 3 detachably attached to a container mouth portion 80, wherein the inner plug 1 includes an upper lid engaging cylinder 5, a container mouth portion-securing member 7 having a circumferential wall 9 that surrounds the upper lid engaging cylinder 5, and linking pieces 11 that link the inner surface of the circumferential wall 9 to the upper lid engaging cylinder 5 so as to form a flow-out port 13; the upper lid engaging cylinder 5 is provided, on the upper end portion of the outer surface thereof, with a circumferential protuberance 5a for temporary engagement; engaging pieces 37 are formed on the inner surface of a top plate 31 of the upper lid 3, the engaging pieces 37 having an undercut 37a for temporarily engaging with the circumferential protuberance 5a that temporary engages with the upper lid engaging cylinder; and a sound-suppressing protrusion 50 is provided in a region surrounded by the engaging pieces 37.