Adjustable lifting structure for chair back
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional chairs lack the ability to adjust the height of the chair back, limiting comfort and ergonomic customization.
Innovation Solution
An adjustable lifting structure for a chair back, comprising a first adjustment unit with a longitudinally hollow chamber and a guide plate, and a second adjustment unit connected via a transmission cable, allowing for customizable height adjustment of the chair back and seat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional chair structure is used, then the structure is simple and easy to manufacture, but the chair back height cannot be adjusted
Solution Approach 1:
The adjustment mechanism is divided into multiple independent components: a first adjustment unit for chair back height, a second adjustment unit for seat height, and a transmission cable connecting them. This segmentation allows each component to perform a specific function while maintaining overall system adjustability without excessive complexity.
Solution Approach 2:
The guide plate is slidably accommodated within the first adjustment unit's hollow chamber, creating a nested structure. The drive block with deformable chambers is nested within the receiving groove of the body. This nesting reduces spatial requirements and integrates multiple functions into compact arrangements.
2Adaptability or versatility
If an adjustable lifting structure with multiple units is added, then chair back and seat height can be customized, but the device complexity increases
Solution Approach 1:
The first adjustment unit (chair back height) and second adjustment unit (seat height) are connected via a transmission cable, allowing them to be operated together as an integrated system. This merging enables coordinated adjustment of both components through a single operational interface, simplifying user interaction despite the multiple functions provided.
Solution Approach 2:
The deformable chambers in the drive block automatically engage with the rail teeth through elastic deformation, providing self-locking functionality. The resilient elements automatically push the drive block to engage with the rail, eliminating the need for manual locking mechanisms and reducing operational complexity for the user.
3Ease of operation
If a sliding mechanism with guide plate and drive block is implemented, then smooth adjustment is achieved, but the manufacturing precision requirements increase
Solution Approach 1:
The drive block utilizes elastic deformation of its deformable chambers to accommodate variations in manufacturing tolerances. The resilient elements provide variable force to maintain engagement between the drive block and rail teeth across different positions, compensating for precision variations without requiring extremely tight manufacturing tolerances.
Solution Approach 2:
The drive block incorporates deformable chambers with elastic walls that can flex to accommodate the sliding motion. This flexibility allows the rigid guide plate to slide smoothly while the deformable chambers absorb misalignments and maintain continuous contact, reducing the precision requirements for the sliding interface.
Data Source
AI summary
An adjustable lifting structure for a chair back contains: a first adjustment unit and a second adjustment unit. The first adjustment unit mates with the second adjustment unit via a transmission cable, and the first adjustment unit includes a longitudinally hollow chamber for slidably accommodating a guide plate connected on a seat. The first adjustment unit includes a body and two covering assemblies. A drive block includes a locking space, a slit, two deformable chambers, a trough, and two projections. The guide plate includes a conducting element and a rail having multiple teeth and multiple cutouts. The second adjustment unit includes an adjuster, an operation cavity, a first aperture, a connecting room, and two stop segments. A transmission cable includes a first transmitting segment and a second transmitting segment, wherein the first transmitting segment has a first defining portion, and the second transmitting segment has a second defining portion.