Synchronized Chair Seat-Backrest Motion Without Lever Mechanisms

The patent removes the complex lever mechanism from the chair structure and replaces it with a simplified elastic connection system. The elastic element directly connects the seat and backrest, eliminating the need for intermediate lever arms and articulated joints while maintaining the synchronized movement function.

The patent replaces the mechanical lever system with an elastic mechanical system. Instead of using rigid levers and hinges, the invention uses an elastic element that provides both the connection and the restoring force, substituting a complex mechanical transmission system with a simpler elastic deformation-based system.

The patent removes multiple elastic elements and lever components from the design, reducing the bill of materials. The simplified structure requires fewer parts to manufacture, assemble, and quality-check, directly lowering production costs while maintaining the core synchronized movement functionality.

The patent combines the functions of multiple components (lever arms, hinges, and multiple elastic elements) into a single integrated elastic connection system. This merging reduces the total number of parts that need to be manufactured and assembled, thereby reducing manufacturing complexity and cost.

The patent extracts and removes the articulated mechanism components from the chair design, replacing them with a direct elastic connection between the seat and backrest. This eliminates intermediate connection elements and reduces the total component count while preserving the synchronized movement capability.

The elastic element serves multiple functions simultaneously: it connects the seat and backrest, provides the restoring force for return movement, and enables the synchronized motion through its elastic deformation. This self-service approach eliminates the need for separate components that would otherwise be required in a traditional articulated mechanism.