Single-hinged lifting mechanism with backboard pull spring reset type pressure prevention function

By incorporating a single-hinge lifting mechanism with a spring-loaded reset anti-pressure function into the massage chair, the problem of footrest damage due to obstacles during flipping is solved, enabling the backrest to automatically avoid obstacles and reset, thus improving the stability and safety of the massage chair.

CN224505014UActive Publication Date: 2026-07-17ZHEJIANG HAOZHONGHAO HEALTH PROD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ZHEJIANG HAOZHONGHAO HEALTH PROD
Filing Date
2025-08-12
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

The footrests of existing massage chairs are easily damaged by obstacles underneath when they are flipped over, and they cannot effectively avoid them.

Method used

It adopts a single-hinge lifting mechanism with tension spring reset anti-pressure function. Through the cooperation of multi-link lifting unit and tension spring, the backrest can automatically lift and avoid obstacles when it encounters them, and automatically reset after the obstacles are removed.

Benefits of technology

This effectively prevents the backrest from crushing obstacles below, ensuring the stability and safety of the massage chair, while also improving obstacle avoidance response speed and sensitivity.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224505014U_ABST
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Abstract

The utility model relates to a single hinge lifting mechanism with backboard pull spring reset type pressure prevention function, including frame, transmission rod and multi-connecting rod lifting unit, still including backboard and pull spring, the multi-connecting rod lifting unit includes transmission arm and support arm, the both ends of transmission arm are connected with frame and transmission rod rotation respectively, the both sides of backboard bottom near frame one end are connected with support arm rotation, one end of pull spring is connected to backboard bottom, the other end is connected with transmission arm, the backboard is by pull spring and is pulled and is supported on support arm. Adopt above -mentioned technical scheme, the utility model discloses through pull spring and drags backboard and sticks to support arm, makes backboard keep stable support when normally lifting, when the backboard below meets the obstacle, the upward reaction force that the obstacle exerts can overcome pull spring tension, force backboard to lift up and avoid for a moment around support arm hinge point, avoid to press the injury, after the obstacle removes, pull spring resets backboard to support position automatically, realizes dynamic pressure prevention and self-reset function.
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Claims

1. A single-hinge lifting mechanism with a backboard tension spring reset type pressure prevention function, comprising a rack (1), a transmission rod (2) symmetrically arranged on both sides of the rack (1), and two groups of multi-link lifting units (3) symmetrically arranged on both sides of the rack (1), characterized in that, It also includes a back plate (4) and a tension spring (5). The multi-link lifting unit (3) includes a transmission arm (31) and a support arm (35). The two ends of the transmission arm (31) are rotatably connected to the frame (1) and the transmission rod (2) respectively. The two sides of the bottom of the back plate (4) near the end of the frame (1) are rotatably connected to the support arm (35). One end of the tension spring (5) is connected to the bottom of the back plate (4) and the other end is connected to the transmission arm (31). The back plate (4) is pulled by the tension spring (5) against the support arm (35).

2. The single hinge lifting mechanism with a pressure preventing function of a return type according to claim 1, characterized in that, The tension spring (5) includes hooks (51) at both ends. The transmission arm (31) includes through holes for passing through the hooks (51). Mounting brackets (41) are fixedly provided on both sides of the bottom of the back plate (4). The mounting brackets (41) are provided with through holes for passing through the hooks (51).

3. The single hinge lifting mechanism with a pressure preventing function of a return type according to claim 2, characterized in that, The transmission arm (31) includes a bent part (311) that bends inward toward the frame (1). The through hole for passing through the hook (51) is provided on the bent part (311). The mounting frame (41) includes connecting parts (411) that fold inward toward the bottom of the back plate (4) on both the left and right sides. The connecting part (411) on the outer side of the mounting frame (41) is rotatably connected to the support arm (35), and the connecting part (411) on the inner side is provided with a through hole for passing through the hook (51).

4. The single-hinge lifting mechanism with a backrest spring return type anti-pressure function according to claim 1, characterized in that, The multi-link lifting unit (3) further includes a first movable arm (32), a second movable arm (33), and a third movable arm (34) located between the transmission arm (31) and the support arm (35). The first movable arm (32) and the second movable arm (33) form a cross structure. The two ends of the first movable arm (32) are rotatably connected to the transmission arm (31) and the support arm (35) respectively. One end of the second movable arm (33) is rotatably connected to the frame (1), and the other end is hinged to the support arm (35) through the third movable arm (34). The first movable arm (32) and the second movable arm (33) are rotatably connected at the intersection.

5. The single hinge lifting mechanism with a pressure preventing function of a return type according to claim 1, characterized in that, A drive unit is provided on the frame (1), and the drive unit drives the transmission rod (2) to swing forward relative to the frame (1).

6. The single hinge lifting mechanism with a pressure preventing function of a return type according to claim 5, characterized in that, The frame (1) includes a leg frame (11), which is hinged to the transmission rod (2) via a transmission arm (31), and the transmission rod (2) is located on the bottom side of the leg frame (11).

7. The single hinge lifting mechanism with a pressure preventing function of a return type according to claim 1, characterized in that, The support arm (35) has a bent structure, including a support part (351) for supporting the back plate (4) at the bottom and a mounting part (352) extending toward the transmission arm (31). The mounting part (352) is rotatably connected to the mounting frame (41) on the side near the frame (1).