Self-Retracting Safety Harness Device

I'm looking for a skilled engineer to design and create a self-retracting device specifically for safety harnesses used in residential construction.

Key Requirements:
- The device should safely retract the harness when not in use, preventing tripping hazards.
- It must be durable and reliable, suitable for the rigors of residential construction work.
- Safety features are a must to ensure the user's protection at all times.

Ideal Skills and Experience:
- Mechanical engineering background.
- Experience with safety equipment design.
- Proficiency in creating durable, reliable retracting mechanisms.

Please provide samples of previous work and detailed proposals.