Bottle Closure Tabs for Torque Generation
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Solution Overview
Problem
Individuals with hand impairments, such as arthritis, face difficulties in opening standard twist and turn caps due to the inefficiency of existing cap designs that fail to provide sufficient torque and comfort, leading to discomfort and reduced capability in accessing bottle contents.
Innovation Solution
A cap design featuring two rectangular vertical tabs over ¼ inches in height, arranged in parallel along the perimeter, allowing users to leverage against a corner surface for torque generation without direct contact, providing stable engagement and increased torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If shallow tabs (about 1/4 inch height) are used to engage corners, then the cap can be twisted, but the tabs slip easily from the corner surface and provide insufficient torque
Solution Approach 1:
The patent changes the height parameter of the tabs from shallow (1/4 inch) to substantial height (5/8 inch or greater), which transforms the engagement mechanics to provide both sufficient torque and reliable corner gripping without slipping
Solution Approach 2:
The patent uses rounded tab profiles with specific radius of curvature to optimize the contact surface with corner edges, distributing pressure to prevent slipping while maintaining torque generation capability
2Force
If tabs are oriented toward the midline of the cap, then the cap structure is simplified, but the torque that can be generated is limited
Solution Approach 1:
The patent positions tabs asymmetrically at the periphery of the cap rather than symmetrically toward the midline, creating longer lever arms that generate greater torque while maintaining structural simplicity
3Force
If rounded tab ends are used, then the tabs have a smooth profile, but the ends have reduced heights and do not provide extensive solid contact surfaces for torque transmission
Solution Approach 1:
The patent optimizes the tab end geometry by controlling the radius of curvature to be small enough to maintain substantial height at the ends, ensuring extensive solid contact surfaces for effective torque transmission while keeping the profile smooth
4Ease of operation
If vertical tabs are used to engage the forearm, then the user can twist the cap, but the tabs dig into the forearm causing discomfort and pain
Solution Approach 1:
The patent introduces a corner surface as an intermediary between the tabs and the user's hand, allowing torque application without direct tab-to-skin contact, thereby eliminating discomfort while maintaining twisting capability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy and comfortable cap opening for impaired individuals by generating sufficient torque through corner engagement, improving usability for arthritic patients and child-resistant caps alike, with enhanced gripping capabilities and reduced risk of slipping.
Implementation Method 1
the tabs of the cap engage the corner. Then the user twists the bottle so as to leverage the tabs against that corner sufficiently to generate enough torque
Implementation Method 2
generate enough torque to loosen the cap
Data Source
AI summary
A cap for a bottle is provided with taps that make it easy for someone with a disability, e.g., arthritis, to twist the cap off of the bottle. The cap can have two or more rectangular vertical tabs arranged along the perimeter of the top surface of the cap so as to face each other in parallel on opposite sides of the top surface of the cap. The tabs have an extended height, i.e., greater than ¼th inch and are separated by a distance approximately equal to the diameter of the top surface of the cap. The top corners of the tabs are squared (90 degree angles) to provide better gripping of a corner against which the tabs are placed while twisting the bottle so as to cause the cap to be released from the bottle.