Vehicle Seat Frame Structure Without Cushion Side Frames

The invention extracts and removes the cushion side frame from the seat frame structure. Instead of using a traditional cushion side frame that connects the rail to the seatback frame, the patent employs a rail with an integrated connection structure that directly connects to the seatback frame, eliminating the need for separate cushion side frame components and thereby reducing overall weight.

The invention merges the functions of the rail and the connection structure into a single integrated component. The rail includes a connection protrusion that directly engages with the seatback frame, combining what were previously separate elements (rail + cushion side frame + connection mechanisms) into one unified structure, reducing part count and weight.

The invention combines multiple functional components into the rail structure itself. The rail includes integrated connection protrusions and engagement structures that perform the functions previously requiring separate cushion side frames, links, and brackets. This merging maintains operational reliability while significantly reducing component count.

The rail is designed as a multi-functional component that simultaneously provides structural support, enables movement, and includes integrated connection mechanisms for the seatback frame. This universal design eliminates the need for specialized components like cushion side frames, as the rail performs multiple functions that were previously distributed across several parts.