Offset Handle Single Tube Crutch Design
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Solution Overview
Problem
Current crutches are often expensive, heavy, not ergonomically designed, lack stability, and have inconvenient adjustment mechanisms, leading to discomfort and potential injury for users.
Innovation Solution
A lightweight, height-adjustable single-tube crutch with a fixed handle and offset grip handle design, featuring a telescoping mechanism for adjustable underarm support and foot grip, made from low-weight materials like aluminum, ensuring stability and comfort with a 300-pound weight capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a single-tube crutch design is used to reduce weight and cost, then material usage and weight are reduced, but ergonomic comfort and stability deteriorate due to improper handle positioning and lack of adjustment mechanisms
Solution Approach 1:
The crutch incorporates adjustable components including a telescoping top member for height adjustment, a movable foot member with locking mechanism, and an adjustable handle position system. These dynamic adjustment capabilities allow the crutch to adapt to different user needs while maintaining stability, resolving the contradiction between lightweight single-tube design and ease of operation.
Solution Approach 2:
The handle is positioned offset from the central axis of the crutch tube, creating a gap between the handle and the tube. This dimensional change in handle positioning allows for improved ergonomics and user comfort while maintaining the structural integrity of the single-tube design.
2Ease of operation
If an adjustable handle is incorporated to improve ease of operation, then user comfort is improved, but stability and reliability deteriorate due to potential handle displacement and improper securing
Solution Approach 1:
The handle adjustment mechanism provides controlled adaptability through a systematic positioning system with multiple fixed positions. Each position can be securely locked, providing both adjustability for comfort and stability through proper securing mechanisms.
Solution Approach 2:
The handle adjustment system is divided into discrete, separable components with defined positioning points. This segmentation allows the handle to be adjusted to different positions while maintaining stability at each position through secure locking mechanisms.
3Device complexity
If the handle is positioned along the central axis of the crutch tube to simplify structure, then manufacturing complexity is reduced, but user comfort and arm positioning deteriorate due to awkward bending requirements
Solution Approach 1:
The handle is positioned offset from the central axis of the crutch tube, creating a gap between the handle and the tube. This dimensional change allows the handle to be positioned in a location that improves ergonomics and user comfort, enabling natural arm positioning without awkward bending, while the offset structure maintains acceptable manufacturing complexity.
Data Source
AI summary
A height adjustable crutch includes a single tube member, a foot grip, an underarm support, and a handle. The single tube member has a central axis along which a main member, a telescoping top member, and a telescoping foot member are aligned. The top member is adjustable relative to a top end of the main member. The foot member is adjustable relative to bottom end of the main member. The foot grip is fixedly attached to the foot member, and the underarm support is fixedly attached to a top end of the top member. The underarm support is generally perpendicular to the central axis of the single tube member. The handle is fixedly attached to the main member and is offset from the central axis of the single tube such that a gap separates a central area of the handle and the main member.