Adjustable Wheelchair Telescopic Frame Assembly
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Solution Overview
Problem
Conventional wheelchairs are difficult to manufacture and assemble in regions lacking skilled workers and tools, making them inaccessible to individuals in need, particularly in third-world countries, where the high cost and complexity of construction condemn disabled persons to home confinement.
Innovation Solution
A wheelchair design featuring a telescopically adjustable undercarriage, tongue, and seat post, utilizing square bar tubes with through holes for easy assembly without welding, allowing for adjustable width, length, and height, along with rotatable seat brackets and interchangeable wheel camber, enabling simple assembly with basic tools by unskilled workers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional wheelchairs are made with welded metal tubing segments, then structural strength and durability are improved, but manufacturing complexity and skill requirements increase
Solution Approach 1:
The wheelchair frame is divided into separate telescopic segments (horizontal axle segments, tongue segments, seat post segments) that can be assembled without welding. Each segment is a discrete piece of metal tubing that connects through telescopic mechanisms, allowing simple assembly while maintaining structural integrity through the segmented design rather than requiring complex welded construction.
Solution Approach 2:
The welding process is replaced with a mechanical telescopic connection system. Instead of joining metal segments through welding, the design uses telescopic segments with alignment holes and fastening mechanisms that allow assembly through simple mechanical insertion and securing, eliminating the need for welding skills and equipment.
2Reliability
If conventional wheelchairs use welded construction techniques, then structural reliability is improved, but ease of assembly and manufacturing accessibility deteriorate
Solution Approach 1:
The frame structure is segmented into modular telescopic sections with standardized connection interfaces. This segmentation allows the wheelchair to be assembled by simple mechanical connections rather than welding, making it accessible to unskilled workers while maintaining reliability through the robust telescopic joint design that provides both strength and adjustability.
Solution Approach 2:
The telescopic segments are designed with self-aligning features and simple fastening mechanisms that allow workers to assemble the wheelchair independently without requiring skilled welding techniques. The design enables unskilled workers to construct reliable wheelchairs using basic tools and straightforward assembly procedures.
3Manufacturing precision
If conventional wheelchairs are manufactured with high skill requirements, then manufacturing precision is improved, but productivity and accessibility in resource-constrained areas deteriorate
Solution Approach 1:
The wheelchair is constructed from standardized telescopic segments that can be manufactured independently with standard precision requirements. The modular design allows for simplified manufacturing processes where each segment is produced using conventional tools, and assembly requires only basic skills, dramatically increasing productivity and accessibility in resource-constrained environments.
Solution Approach 2:
The design changes the manufacturing parameters from requiring precision welding to allowing simple mechanical assembly with standard fasteners. This parameter change enables production in locations with basic tooling capabilities, increasing manufacturing accessibility and productivity while maintaining acceptable precision through standardized connection interfaces.
4Device complexity
If conventional wheelchairs use fixed dimensions, then structural simplicity is improved, but adaptability and adjustability deteriorate
Solution Approach 1:
The wheelchair frame incorporates telescopic segments that can dynamically adjust their lengths. The horizontal axle, tongue, and seat post are all divided into telescopic segments that can be extended or retracted to different positions, allowing the wheelchair to adapt to different user sizes and preferences while maintaining a relatively simple overall structure.
Solution Approach 2:
The frame is segmented into adjustable telescopic sections with multiple alignment holes at different positions. This segmentation enables the structure to be reconfigured at multiple length settings while maintaining structural simplicity through the use of standardized telescopic connection mechanisms rather than complex adjustment systems.
Data Source
AI summary
An adjustable wheelchair for ready assembly in accordance with embodiments of the invention are disclosed. In one embodiment, the wheelchair includes, an undercarriage including, a horizontal axle including a first end segment telescopically coupled to a body segment and a second end segment telescopically coupled to the body segment opposite the first end segment allowing for adjustment of the wheelchair width, and a tongue including a body segment telescopically coupled to an end segment allowing for adjustment of the wheelchair length, and a seat post including an end segment telescopically coupled to a body segment allowing for adjusting the wheelchair seat height; and a pair of wheels; and a swivel wheel coupled to the tongue of the undercarriage to support the wheelchair and provide mobility; and a seat bottom coupled to the end segment of the seat post for load-bearing support; and a seatback rotatably coupled to the seat bottom.