Lid Driving Elements for Torque Control and Direction Feedback
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Solution Overview
Problem
Existing opening devices for containers, such as those used for pourable food products, often result in users pulling the lid instead of unscrewing it, applying excessive torque during re-closing, and facing ambiguity in the unscrewing direction, leading to potential damage.
Innovation Solution
A lid design with a tamper evidence device and distinct driving elements on either side to reduce torque requirements for unscrewing and provide tactile feedback for correct rotation direction, preventing incorrect rotation and excessive force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the lid is designed with a simple screw thread, then the device complexity is reduced, but the user may apply excessive torque or pull the lid causing damage
Solution Approach 1:
The lid is segmented into two functional parts: a driving element integrated into the lid body for torque control, and a separate engagement element (such as a tamper-evident ring or locking mechanism) that interfaces with the pouring spout. This segmentation allows the simple lid structure to work with enhanced pouring spout features, providing torque control and damage prevention without complicating the lid itself.
Solution Approach 2:
An intermediary mechanism is introduced between the lid and pouring spout, such as a tamper-evident ring or intermediate locking structure. This intermediary element absorbs excessive torque and prevents direct force transmission that could damage the pouring spout or lid threads, while still maintaining secure attachment.
2Device complexity
If no direction indication is provided, then the device complexity is reduced, but the user cannot determine the correct unscrewing direction leading to potential damage
Solution Approach 1:
The driving element incorporates visual indicators such as color-coded markings, asymmetric patterns, or directional arrows that change appearance or become visible when rotated. For example, a colored band or pattern on the lid rim provides clear visual feedback about the correct rotation direction, eliminating ambiguity without adding mechanical complexity.
Solution Approach 2:
The driving element features asymmetric geometry, such as an uneven rim pattern, non-circular cross-section, or positioned protrusions, that physically prevents insertion in the wrong orientation. This asymmetric design provides tactile and visual cues for the correct unscrewing direction, ensuring users cannot apply force in the incorrect direction while maintaining a simple overall structure.
3Ease of operation
If the lid provides strong gripping surface, then the ease of operation is improved, but the user may apply excessive torque causing damage
Solution Approach 1:
The lid's gripping surface is segmented into a driving element with enhanced friction features (such as knurled pattern, ribs, or textured surface) that provides strong grip, while the attachment mechanism (threads or locking features) is designed with torque control capabilities. This segmentation allows strong gripping without necessarily transmitting excessive torque to the connection points.
Solution Approach 2:
An intermediary torque-control mechanism is introduced between the gripping surface and the attachment threads, such as a flexible intermediate layer, torque-limiting mechanism, or compliant connection. This intermediary absorbs excess torque while allowing strong gripping, preventing damage to the lid or pouring spout during operation.
Data Source
AI summary
A lid for an opening device for a container includes a body having a longitudinal axis and provided with a top wall and with a side wall internally provided with a thread element suitable for cooperating with a further thread element of a spout of the opening device, the lid further including at least one driving element arranged to receive the fingers of a user during unscrewing of the lid from the spout and during screwing of the lid on the spout, the at least one driving element being delimited by an upper wall and by a lower wall extending from the side wall and spaced apart from each other along the longitudinal axis, the lower wall diverging from the upper wall when moving away from the side wall.