20251ME3: Folding Stair Climbing Trolley and Hand Truck

Last updated on 27 Jul 2025

Brief Description & Functionality

A folding stair climbing trolley and hand truck is a mechanical device designed for safe and efficient transport of heavy goods over stairs and uneven terrain. The key feature of this device is the Tri-Star wheel mechanism, which allows the trolley to “walk” over steps. It is also equipped with a foldable steel frame, allowing the user to collapse and carry or store it conveniently when not in use.

This trolley is designed to:

Climb standard staircases with minimal user effort
Be folded for storage and easy portability
Transport medium to heavy loads over uneven terrain
Reduce physical strain on the operator compared to traditional trolleys
Be built from low-cost, durable materials such as mild steel and rubber

Working Principle

The system integrates a Tri-Star wheel configuration, where three wheels are mounted on a rotating triangular frame on either side of the axle. When one wheel encounters an obstacle (like a stair edge), the frame rotates and positions the next wheel in contact, allowing the trolley to “climb” the step. This significantly reduces the lifting force required from the user.

Additionally, the foldable frame mechanism allows the trolley to be collapsed horizontally or vertically to reduce space consumption, making it ideal for compact storage in homes, warehouses, or delivery vehicles.