Rotary Device Adapter for Low-Profile Knob Grasping
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Solution Overview
Problem
Rotary devices used for tightening laces or cables pose challenges for individuals with poor dexterity or impaired strength due to their low profile design, making it difficult to grasp and rotate the knob, and they often put undue stress on the article being secured, risking premature failure.
Innovation Solution
An adapter with a handle and coupler that provides increased clearance and mechanical advantage for rotating the rotary device, featuring a larger diameter handle with ergonomic grip and indicia for direction, and a connector system for secure mounting that eliminates adhesives and provides a robust connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the rotary device is designed with a low profile to integrate with the article, then the device minimizes bulkiness and clearance issues, but it becomes difficult for individuals with poor dexterity to grasp and rotate the knob
Solution Approach 1:
An adapter assembly is introduced as an intermediary component between the user's hand and the rotary device knob. The adapter includes a handle with grip features that extend beyond the low profile of the rotary device, providing an enlarged gripping surface while the coupler portion connects to the existing knob structure. This mediator allows users with poor dexterity to easily grasp and rotate the device without changing the rotary device's low-profile design.
Solution Approach 2:
The adapter is divided into distinct functional segments: a handle portion for gripping, a coupler portion for connecting to the rotary device, and engagement features that interface with the knob. This segmentation allows each part to be optimized independently - the handle can be sized for easy grasping while the coupler maintains compatibility with the low-profile rotary device mounting.
2Shape
If the rotary device is designed with a low profile to conform to the article, then the device integrates smoothly without catching on clothing, but there is insufficient clearance from the article making it difficult to grasp
Solution Approach 1:
The adapter extends the gripping interface in a dimension perpendicular to the article surface - the handle protrudes axially from the low-profile rotary device base. This dimensional extension provides the necessary clearance and gripping surface area without compromising the rotary device's conformance to the article in the radial plane, allowing smooth integration without catching on clothing.
3Productivity
If the rotary device transmits rotational forces to the article through tensioning, then the device effectively tightens laces or cables, but it may cause undue stress on the article portions or shear the connection
Solution Approach 1:
The adapter assembly serves as a mechanical intermediary that distributes and manages the forces transmitted during rotation. The coupler and handle structure provides a larger moment arm and more distributed force application point on the article, reducing stress concentration at the mounting connection. This mediator allows effective tensioning while protecting the article structure from premature failure.
4Volume of moving object
If the rotary device uses a small knob to maintain low profile, then the device integrates cleanly with the article, but individuals with weakness in hands or limited dexterity cannot rotate the knob to tighten laces
Solution Approach 1:
The adapter handle acts as a force-multiplying intermediary that users with hand weakness can easily manipulate. The enlarged handle diameter and grip features require minimal gripping force and provide mechanical advantage for rotation, while the coupler transmits this rotational motion to the small-knobbed rotary device, enabling users with impaired strength to effectively tighten laces.
Solution Approach 2:
The adapter introduces dynamic leverage through its handle-coupler geometry. The longer moment arm of the handle compared to the original knob creates mechanical advantage, reducing the torque required from the user's hand. This dynamic mechanical advantage enables users with limited hand strength to generate sufficient rotational force on the rotary device.
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
Facilitates easier and precise rotation of rotary devices for users with limited dexterity and strength, while ensuring the article can withstand rotational forces without structural damage, through improved gripping and mounting solutions.
Implementation Method 1
The handle and the coupler together define an adapter for a rotary device. The handle is sized with a width or diameter greater than a knob on the rotary device... providing increased clearance and mechanical advantage for rotating the rotary device
Implementation Method 2
a coupler extending from the handle and adapted to engage the rotary device and releasably interlock therewith
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An adapter (100) is arranged to secure to a rotary device (10). The adapter includes a handle (102) rotatable about an axis (A-A), and a coupler (104) extending from and coaxial with the handle (102). The coupler (104) is adapted to engage the rotary device (10) via traction elements for simultaneously rotating the rotary device (10) and the handle (102).