Vehicle Seat Backrest Frame Stiffness via Displacement Restrictor

The connection system is segmented into a male connection member and a female connection member with distinct functions. The male member provides structural support while the female member with displacement restrictor provides controlled movement limitation. This segmentation allows each component to be optimized independently, achieving high stiffness without excessive overall complexity.

The displacement restrictor acts as an intermediary element between the male and female connection members. It mediates the interaction by providing a controlled stop that limits transverse movement while allowing the connection to remain relatively simple in overall structure. This intermediary component enables the stiffness improvement without requiring a completely complex connection system.

The rigid constraint is applied locally only where needed - at the connection point between centre frame and side frame through the displacement restrictor. The rest of the frame structure can remain lighter and less complex. This localized application of stiffness provides crash safety improvement without requiring the entire frame structure to be heavily reinforced.

The connection system changes the parameter of transverse movement from unrestricted to restricted at a specific insertion distance. This parameter change provides the necessary stiffness for crash safety while maintaining a relatively simple and lightweight overall structure, as the restriction is achieved through a geometric feature rather than additional heavy materials.