Swivel Vehicle Seat Structure That Holds the Cushion Frame Upright

The hook structure is engaged with the fixing pin before swiveling begins, creating a preliminary counteracting force that prevents the seat cushion frame from folding down during the swiveling process. This preliminary anti-action ensures the frame remains stable throughout the rotation.

The hook acts as an intermediary component between the swivel lever and the seat cushion frame. It transfers and maintains the engaged state with the fixing pin throughout the swiveling process, ensuring the frame remains properly positioned during rotation.

The hook and swivel lever are combined into a single rotating assembly that moves together. When the swivel lever rotates to unlock the swivel device, the hook simultaneously maintains engagement with the fixing pin, merging the unlocking function with the stability maintenance function.

The hook-swivel lever assembly dynamically adjusts during operation. The hook remains engaged with the fixing pin during swiveling to maintain stability, and can be disengaged when needed, providing dynamic control over the frame's constrained movement.

The hook structure serves multiple functions: it acts as a locking mechanism to prevent unintended folding, serves as a connection element between the swivel lever and frame, and maintains the engaged state throughout swiveling. This multi-functionality reduces the need for separate components.

The locking function is segmented into a separate hook component that can operate independently from the main swivel mechanism. This segmentation allows the locking feature to be added without significantly increasing overall system complexity, as the hook is a discrete, simple element.