Thermoplastic Seat Backrest Framework with Embedded Reinforcement

The patent uses composite materials consisting of thermoplastic material combined with fiber reinforcement (such as glass fibers, carbon fibers, or organic fibers) to create a framework that achieves both lightweight construction and high strength/stiffness. The fiber-reinforced composite provides the necessary mechanical properties while being significantly lighter than carbon steel.

The patent changes the material parameters by transitioning from metallic materials to fiber-reinforced thermoplastic composites, altering the density, strength-to-weight ratio, and other physical properties to simultaneously reduce weight and maintain or improve strength and stiffness.

The patent merges multiple manufacturing operations into a single injection molding process. The framework, reinforcement elements, and connecting structures are all formed in one integrated molding operation, eliminating the need for separate manufacturing and assembly steps required by metal fabrication processes such as cutting, welding, and fastening.

The patent replaces mechanical assembly processes (welding, fastening, joining) with a chemical/thermal bonding process through injection molding. The thermoplastic material is molded directly onto the reinforcement elements, creating integral bonds without requiring additional mechanical assembly operations.