Dual-Purpose Shoes with a Folding Pulley Device

The problem

Consumers often want the convenience of rolling transport without sacrificing the ability to walk normally. Existing solutions usually involve bulky add-on devices or separate skate shoes that are uncomfortable to walk in due to protruding wheels. There is a need for a footwear design where the rolling elements can be completely hidden within the shoe structure when not in use, providing a stable, flat base for walking while retaining the functionality of inline skates.

The solution

The patent describes a folding pulley device integrated into a shoe sole. The core of the solution is a mechanical linkage system that moves the wheels from an operational position to a storage position.

1. A linkage frame serves as the central structural component. It holds three horizontal, parallel shafts: a locking movable shaft, a transmission front shaft, and a middle fixed shaft.
2. The front wheel frame connects to the first rotating fixed shaft and the transmission front shaft.
3. The rear wheel frame connects to the second rotating fixed shaft and the transmission rear shaft.
4. A shell seat houses these components. It features specific limiting holes (horizontal, vertical, and arc-shaped) that guide the movement of the shafts.
5. A switch mechanism allows the user to toggle the state. By moving the locking movable shaft into either a folding clamp hole or an unfolded clamp hole, the device is held securely in its respective position.
6. A reset tension spring assists in the return movement between the middle fixed shaft and the first rotating fixed shaft.

Who it is for

• Recreational Footwear Brands: Companies looking to expand their product lines with hybrid shoes that offer both walking and skating capabilities.
• Commuter Product Developers: Brands targeting urban users who need versatile transportation options for short distances.
• Children’s Toy and Gear Manufacturers: Producers interested in safe, interactive footwear designs that allow kids to switch modes easily.
• Outdoor Activity Suppliers: Retailers seeking unique inventory items that bridge the gap between casual shoes and sports equipment.

How it works

The main parts

The device relies on precise alignment of shafts and frames to ensure stability during both states.

Operating Steps

1. Unfolded State (Skating): The locking movable shaft engages the unfolding clamp hole. The front and rear wheel frames extend downward through openings in the sole, allowing the wheels to contact the ground.
2. Transition: The user manipulates the switch mechanism. The locking shaft disengages from one clamp hole and moves toward the other.
3. Folded State (Walking): The locking movable shaft engages the folding clamp hole. The wheel frames rotate upward and inward, tucking into recesses on the left and right sides of the sole’s middle section.
4. Locking: The shaft remains in the folding clamp hole, preventing the wheels from accidentally deploying while walking. The top surface of the shell seat sits flush with the sole.

Applications

Urban Commuting

Users can roll over sidewalks and bike paths, then quickly fold the wheels to enter buildings or cross uneven terrain where skating is impractical.

Park Recreation

Ideal for families visiting parks where certain areas prohibit wheeled devices. The shoes convert instantly to regular footwear for playgrounds or grassy areas.

School and Campus Travel

Students can navigate large campuses efficiently using the rolling mode, then switch to walking mode for classrooms and libraries without changing shoes.

Fitness Walking

Provides an option for low-impact exercise. Users can alternate between brisk walking with flat soles and gliding movements when the wheels are deployed.

Where it is less suitable

• High-Speed Skating: The mechanical complexity and folding nature may not support the rigidity required for aggressive inline skating or high speeds.
• Rough Terrain: While useful for commuting, the small wheel size and folding mechanism are not designed for off-road or highly irregular surfaces.
• Heavy Industrial Use: The plastic and metal components described are intended for recreational wear, not protective safety footwear standards.