Integral Transfer Bar for Wheelchair Stability and Exercise
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Solution Overview
Problem
Existing wheelchair transfer systems lack stability and safety during transfers between a wheelchair and a bed or other support facilities, often requiring complex and costly structures that are inconvenient to use and prone to misplacement, and existing exercise attachments have no secondary function during transfers.
Innovation Solution
An integral tubular exercise and transfer bar with vertically extending legs and a transversely extending grip section that can be securely attached to both the wheelchair and a support facility, allowing it to serve as both an exercise bar and a stable transfer aid, with elastic resistance bands for upper body exercises and a secure barrier during transfers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a transfer board is used to facilitate transfers between wheelchair and bed, then transfer capability is improved, but structural stability deteriorates because the board is positionally secured only at the wheelchair but not at the bed
Solution Approach 1:
The transfer bar integrates both the transfer function and exercise bar function into a single unified structure. The bar includes a grip section with first and second legs that can simultaneously engage with the wheelchair and bed, creating a stable bridge structure that combines multiple functions (transfer aid and exercise equipment) into one device, thereby improving both stability and versatility.
Solution Approach 2:
The transfer bar is designed to serve multiple functions: it acts as a stable transfer bridge when engaged with both wheelchair and bed, and simultaneously functions as an exercise bar when engaged only with the wheelchair. This multi-functionality eliminates the need for separate transfer boards and exercise bars, while ensuring structural stability through dual engagement points.
2Ease of operation
If a transfer board is used to facilitate transfers, then transfer capability is improved, but device complexity increases because the board must be stowed as part of the chair structure when not in use
Solution Approach 1:
The transfer bar serves dual purposes: as a transfer bridge when needed and as an exercise bar during routine use. This eliminates the need for separate storage mechanisms and reduces overall device complexity by consolidating multiple functions into a single attachment that remains permanently mounted on the wheelchair.
Solution Approach 2:
By merging the transfer bar and exercise bar into a single integrated structure with identical mounting interfaces, the design eliminates the complexity of separate storage and retrieval systems. The unified structure simplifies the overall attachment mechanism while maintaining both functions.
3Adaptability or versatility
If separate transfer boards and exercise bars are used, then functional versatility is improved, but loss of time increases because the exercise bar must be stored or stored separately where it may be misplaced
Solution Approach 1:
The transfer bar is designed to perform both transfer and exercise functions through a single attachment system. The bar can be configured for transfer by engaging both wheelchair and bed connectors, or for exercise by engaging only the wheelchair connectors, eliminating the need for separate equipment and ensuring both functions are always available without retrieval or storage operations.
4Ease of operation
If bridge members diverge to connect wheelchair to bed, then transfer capability is improved, but reliability deteriorates because the user must twist body 180° and switch hands while turning around in the space
Solution Approach 1:
The transfer bar employs asymmetric leg configurations where the first and second legs are positioned at different angles and lengths to optimize the transfer path. This asymmetric design creates a more favorable geometric arrangement that reduces the twisting motion required during transfer, thereby improving safety while maintaining transfer capability.
Data Source
AI summary
Stable transfer of a person from a wheelchair to another support facility, such as a bed or commode, utilizes a support bar having first and second legs depending vertically from respective ends of a transversely extending grip section. In a normal or exercise mode the lower ends of the bar legs can be selectively secured in respective sockets on opposite sides of the wheelchair with the grip section disposed horizontally in front of the wheelchair. In a transfer mode the bar is positioned with the lower end of the first leg removably engaging a bed or other support facility and the lower end of the second leg engaging to one of the wheelchair sockets such that the bar stably secures the wheelchair to the facility and the grip section can be grasped by a person transferring between the wheelchair and the support facility.