Synthetic Resin Cap Fixing Rib Posture Control
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Solution Overview
Problem
Conventional synthetic resin caps often interfere with the drinker's face when opening a container, and it is difficult to determine when the container is fully opened, leading to discomfort and potential cap loss.
Innovation Solution
A synthetic resin cap design featuring a tamper-evident band and a cap main body with a fixing rib and strap portion, which maintains the cap's posture when opened by engaging with the container's mouth portion, preventing interference and ensuring complete opening detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cap main body is allowed to flip freely about the ring member as a base point, then the cap can be opened easily, but the cap may interfere with the drinker's face (cheek, nose) during drinking
Solution Approach 1:
The patent applies preliminary anti-action by designing the fixing rib with a specific geometric shape (first inclined portion flaring downwards and protrusion portion extending radially outward) that preemptively prevents the cap from interfering with the drinker's face. The protrusion portion contacts the container mouth portion at a predetermined position, establishing a stop point that limits the cap's flipping range before it can reach harmful positions near the drinker's face.
2Object-affected harmful factors
If the cap main body is constrained to maintain a specific posture when opened, then face interference is prevented, but it becomes difficult to determine when the container is completely opened
Solution Approach 1:
The patent applies the color changes principle through visual indication features on the cap structure. The fixing rib's geometric features (protrusion portion, first inclined portion) are designed to create visible positional relationships with the container mouth portion. When the cap is fully opened, these features align or contact in a specific manner that provides visual feedback to the user, enabling easy detection of opening completion without compromising the posture constraint.
3Reliability
If the cap main body is constrained to maintain a specific posture when opened, then the cap can be prevented from falling or loss, but the cap may still interfere with the drinker's face
Solution Approach 1:
The patent applies local quality by creating different functional zones on the fixing rib structure. The first inclined portion provides a smooth transition surface for opening, while the protrusion portion creates a specific contact point with the container mouth portion that limits the flipping angle. This localized geometric differentiation enables the cap to maintain reliability through controlled posture while preventing face interference by restricting the maximum rotation angle to a safe range.
Data Source
AI summary
[Object]To provide a synthetic resin cap of a structure that is further improved in convenience when drinking while suppressing falling or loss of the cap when a container is opened.[Solving Means]A synthetic resin cap as a specific example of the present invention has a tamper-evident band to be fitted on an outer peripheral surface of a container mouth portion of a container, and a cap main body having a skirt wall and a top plate, and including, in the skirt wall, a fixing rib coupled with the tamper-evident band via a weakened portion and a strap portion and extending to a radially outer side of the skirt wall. The fixing rib is formed from a first inclined portion that flares downwards, and a protrusion portion that is disposed below the first inclined portion. When the container is opened, a side surface of the container mouth portion and the protrusion portion come into contact with each other, and an upper surface of a laterally extending portion, the laterally extending portion being disposed below the container mouth portion and extending in a radial direction, and the top plate come into contact with each other, thereby maintaining a posture of the cap main body when the container is opened.