Folding Frame for Baby Strollers with Sliding Wheel Linkage

The problem

When parents fold a stroller to load it into a car trunk or carry it up stairs, they often deal with multiple independent latches and loose parts. The handlebar drops, but the leg tubes stay spread out. The wheels remain at their full running width, keeping the folded package bulky. A frame that requires several distinct actions increases the chance of pinched fingers and makes it difficult to manage the fold while holding a child.

The solution

This patent describes a folding framework that links the rotation of the handle directly to the retraction of the wheel frame.

1. A base frame (1) forms the main structure, containing a sliding slot (11).
2. A wheel frame (2) carries the wheels and has a wheel frame sliding block (21) that fits into the sliding slot, allowing it to move back and forth along the base frame.
3. A rotating element (3) is mounted on the base frame so it can pivot around its own axis toward the longitudinal direction of the base frame.
4. A handheld carrying handle (4) is connected to the rotating element.
5. A connecting rod group (5) sits between the handle and the wheel frame. When the handle and rotating element turn relative to the base frame, the connecting rod group drives the wheel frame to slide and stretch on the base frame, unfolding or folding it.
6. A folding control mechanism locks the rotating member on the base frame when the stroller is open. The handle itself acts as the operating member to unlock it.

Who it is for

• Stroller brands looking for a frame mechanism that reduces the folded footprint without adding complex cables or secondary levers.
• Amazon private-label sellers who need a straightforward folding stroller design that is easy to demonstrate in listing videos and simple for buyers to operate.
• Wholesalers of juvenile products supplying retailers that prioritize compact storage for urban customers living in apartments.
• OEM stroller factories seeking licensed or reference frame architectures to build upon for their own brand lines.

How it works

The main parts

Operating steps

1. Unlock - The user grips the handheld carrying handle (4), which acts as the operating member of the folding control mechanism, releasing the lock on the rotating element (3).
2. Rotate - The user turns the handle, causing the rotating element to pivot around its axis toward the longitudinal direction of the base frame (1).
3. Link - The connecting rod group (5), connected either to the handle or directly to the rotating element, transfers this rotation into linear motion.
4. Slide - The wheel frame sliding block (21) moves inside the sliding slot (11), pulling the wheel frame (2) and its first wheel set (14) inward along the base frame.
5. Collapse - If present, the seat (6) rotates synchronously with the rotating element. The push handle (7) also rotates closer to the wheel frame via the folding joint (8).
6. Carry - Once fully collapsed, the reduced overall volume allows the parent to lift the stroller by the carrying handle. To unfold, the steps are reversed.

Applications

Urban apartment living

Parents storing strollers in small entryways or closets need the smallest possible folded size. By sliding the wheel frame inward along the base frame rather than just hinging the legs, this mechanism shrinks the footprint significantly. The carrying handle doubles as the fold release, leaving one hand free.

Car trunk loading

Fitting a stroller into a compact car trunk often means wrestling with protruding wheels. Because the wheel frame retracts into the base frame’s profile, the folded shape is more rectangular. The synchronized seat rotation prevents the seat fabric from catching on the frame during the fold.

Public transit and travel

Navigating buses or trains requires quick folding and carrying. The single-motion linkage allows a parent to collapse the frame while standing. The integrated carrying handle provides a secure grip immediately after folding, without needing to find a separate strap.

Forward and rear-facing use

Buyers frequently switch seat orientation depending on the child’s age. The rotating element features a seat connecting portion with a dovetail groove structure, allowing the seat to be installed facing forward or backward. The folding action works identically in both orientations.

Where it is less suitable

• Jogging strollers - large fixed wheels and rigid frames designed for running stability do not use sliding wheel retraction.
• Double or tandem strollers - the patent describes a single-seat framework; adapting the sliding slot and linkage for two seats side-by-side would require substantial redesign.
• Umbrella strollers - ultra-lightweight umbrella folds rely on a different scissor-hinge geometry rather than a sliding base track.