Zipper Guide Reduces Degrees of Freedom for Tremor Users
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Solution Overview
Problem
Patients with tremors, such as those with Parkinson's disease or Essential Tremor, face difficulties in performing tasks requiring small muscle movements, like aligning open-ended zipper ends due to the complexity of aligning zipper teeth in three-dimensional space.
Innovation Solution
A zipper guide that simplifies the alignment process by providing a base with a trench and a slider with a key that guides the zipper teeth into interlocking engagement, reducing the required degrees of freedom from five to one, allowing users to easily attach open-ended zipper ends without precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional open-ended zipper alignment is used, then the zipper mechanism is simple and requires no additional components, but the alignment complexity is high requiring precise three-dimensional manipulation
Solution Approach 1:
The patent introduces a guide component as an intermediary element between the two zipper ends. This guide includes a channel that receives the pin and a ledge that guides the box, mediating the alignment process and transforming the complex three-dimensional alignment task into a simple linear insertion task.
Solution Approach 2:
The patent reduces the alignment task from three-dimensional manipulation to one-dimensional linear movement by constraining the pin and box to move along predefined paths (channel and ledge). This dimensionality reduction simplifies the user's task while maintaining the zipper's basic mechanism.
2Device complexity
If traditional zipper alignment is used, then no additional components are required, but the margin of error for alignment is small requiring precise positioning
Solution Approach 1:
The guide component serves as a mediator that provides physical constraints (channel and ledge) to enforce proper alignment. These constraints act as a tolerance buffer, allowing for larger manufacturing variations in the zipper components themselves while still achieving precise final alignment through the guide's geometry.
Solution Approach 2:
The guide component is installed beforehand to provide alignment assistance during the zipper closing operation. The channel and ledge structures are designed in advance to compensate for potential misalignment issues, cushioning against positioning errors before the pin and box engage.
3Ease of operation
If traditional zipper alignment is used, then the operation process is simple requiring only pin insertion, but the degrees of freedom for movement are high making alignment difficult
Solution Approach 1:
The guide component dynamically constrains the movement of the pin and box during the alignment process. The channel guides the pin's movement while the ledge guides the box's movement, transforming the static alignment problem into a dynamic guided process that automatically compensates for positioning errors.
Solution Approach 2:
The alignment function is segmented into two independent guided movements: pin guidance through the channel and box guidance through the ledge. This segmentation allows each component to be optimized for its specific guidance function while working together to solve the overall alignment problem.
Data Source
AI summary
A zipper guide is provided to facilitate closure of an open-ended zipper. The zipper guide includes a base to which a zipper tape pin end is attached and a slider to which a zipper tape box end is attached. A key on a lower surface of the slider slides in a trench in an upper surface of the base at an orientation that guides the attached zipper tape box end toward the attached zipper tape pin end by planar sliding movements of the slider lower surface with respect to the base upper surface.