Mechanical stretching device and seat unit

By designing a mechanical extension device, and utilizing the coordinated movement of the base, backrest assembly, leg assembly, and drive mechanism, combined with the swing assembly and support assembly, the stability problem caused by the forward shift of the center of gravity during posture changes in the seating is solved, achieving safety and stability in different postures.

CN122004608APending Publication Date: 2026-05-12JASON FURNITURE(HANGZHOU) CO LTD
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Patent Information

Application Number
CN202610030063.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2025-12-01
Filing Date
2026-01-09
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

When transitioning from a standard sitting posture to a TV posture or reclining posture, the center of gravity of existing seating shifts significantly forward, resulting in reduced stability and a risk of tipping over.

Method used

A mechanical extension device is designed, including a base, a backrest assembly, a leg assembly, and a drive mechanism. It avoids forward shift of the center of gravity by coordinating movements and provides additional support during posture transitions by utilizing a swing assembly and a support assembly, thereby enhancing stability.

Benefits of technology

It effectively avoids the risk of tipping over due to the forward shift of the center of gravity, ensures the stability of the device during different posture transitions, and adapts to the sitting posture requirements of different usage scenarios.

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Abstract

The invention discloses a mechanical stretching device and a seat unit. The mechanical stretching device can prevent the mechanical stretching device from overturning when the mechanical stretching device is in a lying posture position. The mechanical stretching device further comprises a swing assembly and a supporting assembly, the swing assembly is movably connected to the base, the supporting assembly comprises a second supporting rod and a third supporting rod, one end of the third supporting rod is rotationally connected to the swing assembly, the other end of the third supporting rod is rotationally connected to the second supporting rod, and one end of the second supporting rod is movably connected to the leg assembly. A roller is arranged at the other end of the second supporting rod; in the process that the mechanical stretching device is changed from the sitting posture position to the TV posture position, the third supporting rod and the swing assembly are relatively static, and the second supporting rod rotates in the third direction so as to reduce the height of the rolling wheel; in the process that the mechanical stretching device is converted from the TV posture position to the lying posture position, the third supporting rod and the swing assembly move relatively, and the second supporting rod moves forwards in the first direction and rotates in the third direction so that the rolling wheel can be supported on the ground.
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