Mechanical stretching device for movable seat unit and seat unit
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Solution Overview
Problem
The transition of a movable seat unit from a sitting to a lying position creates a gap between the backrest and seating portion, leading to issues such as upward pulling of garments and increased risk of items falling, due to the uncoordinated movement of the footrest and backrest.
Innovation Solution
A mechanical stretching device with a frame assembly and a backrest assembly that includes a lower and upper frame section, a curved extending armrest, and a backrest connecting rod assembly, allowing coordinated movement to minimize gaps and enhance user comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the footrest and backrest move independently during position transition, then the mechanical structure is simpler, but a gap emerges between the backrest and seating portion causing garment pulling and item falling risks
Solution Approach 1:
The patent combines the footrest assembly and backrest assembly into an integrated mechanical stretching device where both components are coupled to the seat frame through linkages. This merging ensures that when the footrest moves forward and upward, the backrest simultaneously bends backward in a coordinated manner, eliminating the gap between the backrest and seating portion while maintaining relatively simple mechanical structure.
2Ease of operation
If the backrest bends backward significantly during lying position transition, then user comfort in zero gravity position is improved, but the gap between backrest and seating portion increases causing garment pulling
Solution Approach 1:
The patent implements dynamic coordinated movement where the backrest's bending angle is mechanically linked to the footrest's position. As the footrest transitions to the lying position, the backrest dynamically adjusts its bending degree through the coupling mechanism, ensuring that the backrest maintains appropriate contact with the seating portion throughout the transition, thereby providing user comfort while preventing garment pulling.
3Ease of operation
If the footrest extends further forward and upward in lying state, then zero gravity position is achieved, but the uncoordinated movement with backrest creates larger gap
Solution Approach 1:
The patent merges the movement control of the footrest and backrest through a coupled mechanical linkage system. When the footrest extends to achieve the zero gravity position with legs higher than the head, the backrest simultaneously bends backward in a coordinated fashion through the linkage coupling, ensuring that the gap between the backrest and seating portion is minimized or eliminated throughout the entire transition process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device ensures smooth transitions between sitting, relaxing, and lying positions, reducing garment pulling and item loss while providing enhanced ergonomic support and comfort, especially in the 'zero gravity' lying position.
Implementation Method 1
the backrest connecting rod assembly compresses to rotate the backrest mounting member rearward about the first pivot point
Implementation Method 2
the backrest connecting rod assembly expands to rotate the backrest mounting member forward about the first pivot point
Implementation Method 3
the upper frame section transitions to the lower section via a stepped portion
Data Source
AI summary
The present disclosure relates to a movable seat with a mechanical stretching device. The movable seat includes a frame assembly connected to the mechanical stretching device and the frame assembly includes a seat frame configured to support a seating portion of the movable seat, an armrest frame fixedly connected to the seat frame, and a backrest frame configured to support a backrest of the movable seat, where the backrest frame includes a lower frame section and an upper frame section, the upper frame section transitions to the lower section via a stepped portion, and a rear part of the armrest frame includes a curved extending section, and a gap is formed between the armrest frame and the upper frame section.