chair redesign

 

 

finally working on something that I can do.

ok so that idea was flawed, 

this might make it easier to get around though idk.

Potential Benefits:

• Increased Mechanical Advantage: A gear system could allow the user to change resistance, making it easier to move on inclines or rough terrain.
• More Efficient Energy Use: A crank system might allow for smoother propulsion compared to traditional push-rim designs, reducing strain on the arms.
• Ergonomic Improvements: Hand-crank systems (similar to hand cycles) could reduce repetitive stress injuries from traditional wheelchair use.

Potential Challenges:

• Complexity: A chain and gear system introduces more moving parts that require maintenance.
• Maneuverability: Traditional wheelchairs rely on direct rim contact for fine control, which might be more difficult with a drivetrain.
• Bulk and Weight: Adding a chain and crankset could increase the weight and dimensions of the wheelchair, making it less portable.

Possible Solutions:

• Hybrid System: Combining direct rim propulsion for fine control with a crankset for long-distance movement.
• Lever-Based Propulsion: Instead of a full bicycle drivetrain, some wheelchairs already use lever systems to reduce strain and improve efficiency.
• Recumbent Hand-Cycle Design: Some sports wheelchairs use hand cranks to propel a third wheel, making movement more efficient over longer distances.

Would you like to explore a 3D design concept for a drivetrain-powered wheelchair? This could be a fun and useful prototype to develop in Blender and Unreal Engine!

possible solutions 

3 Ways to Shift Between Low & High Gear on a Wheelchair Transmission

1. Manual Lever Shifting (Simplest)

• How it works: A lever or twist-grip mounted on the chair controls a derailleur or a gear selector.
• Pros: Simple, reliable, lightweight.
• Cons: Requires manual shifting effort.

✅ Example: Think of how a mountain bike’s front derailleur shifts between a big and small chainring.

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2. Automatic Hub Gear (Internal Gear Shifting)

• How it works: Uses an internal planetary gear hub (like a Nexus or Rohloff hub) to switch between gears without derailleurs or chains jumping between sprockets.
• Pros: No external moving parts, smooth shifting, reliable.
• Cons: Harder to build yourself, might require commercial parts.

✅ Example: Think of an electric bike’s internal hub gear, where the gears shift smoothly inside the hub.

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3. Centrifugal Clutch / Automatic Gear Shifting

• How it works: Uses RPM (wheel speed) to shift automatically between low and high gear based on movement.
• Pros: Hands-free shifting, adapts dynamically.
• Cons: More complex, needs fine-tuning.

✅ Example: Think of how a go-kart or a moped’s CVT transmission shifts gears automatically as it gains speed.

the most practical cost effective accessible thing I can think of that solves the problems of wheel chairs and stairs. =) I sent this to the upsto office I'm not done I just don't know blender and I'm exhausted. I'm going to give it to the va though that way everyone can benefit from it. I just want to work on the thing lol =) =D

Patent Pending.

well someone beat me to it. =) 

https://www.youtube.com/watch?v=hxf-fIubkMs&t=347s