Adjustable lifting structure for chair back
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional adjustable lifting mechanisms for chair backs are complex, limited in movement due to multiple locking orifices, and do not allow for continuous variable adjustment of the lifting height.
Innovation Solution
An adjustable lifting structure comprising a first and second adjustment unit connected via a transmission cable, where the first adjustment unit includes a longitudinally hollow chamber to accommodate a guide plate, and the second adjustment unit features an actuation mechanism with a pull ring, resilient elements, and a drive block to enable adjustable lifting and fixing of the chair back.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple locking orifices are used to limit chair back movement, then the chair back can be fixed at discrete positions, but the lifting height adjustment is limited and cannot achieve continuous variable adjustment
Solution Approach 1:
The patent replaces the conventional mechanical locking orifice system with a cable-driven tensioning mechanism. The cable connects the chair back to the support column, allowing continuous adjustment of the chair back height by varying cable tension, eliminating the need for discrete locking orifices and enabling continuous variable adjustment.
Solution Approach 2:
The patent changes the adjustment parameter from discrete positional locking (locking orifices) to continuous tension variation (cable tension). By adjusting the cable tension through winding or unwinding, the chair back can be positioned at any height within the adjustment range, achieving continuous variable adjustment.
2Ease of operation
If a conventional adjustable lifting mechanism with multiple components is used, then the chair back can be adjusted, but the mechanism becomes complicated and requires screwing elements for assembly
Solution Approach 1:
The patent merges multiple components into an integrated cable-driven system. The cable serves multiple functions: it supports the chair back, enables height adjustment, and provides tensioning control. This consolidation reduces the number of separate components and eliminates the need for screwing elements, simplifying both the mechanism and assembly.
Solution Approach 2:
The patent extracts and eliminates unnecessary components from the conventional mechanism, such as locking orifices, retainers, and screwing elements. By removing these redundant parts and retaining only the essential cable-driven tensioning mechanism, the overall device complexity is reduced while maintaining adjustment functionality.
3Reliability
If the case is fixed on the chair back using screwing elements, then the connection is secure, but the production process becomes more complex and time-consuming
Solution Approach 1:
The patent replaces the screwing connection system with a cable attachment mechanism. The cable is secured to the chair back using simple knots, clips, or other non-screwing fastening methods, which maintain connection stability while dramatically simplifying the production and assembly process.
Solution Approach 2:
The patent employs simple, easily replaceable connection elements instead of permanent screwed joints. These simplified connectors can be quickly installed and removed without specialized tools, reducing manufacturing complexity and assembly time while maintaining sufficient connection reliability for the application.
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
Enables continuous and adjustable lifting of the chair back with enhanced user control and flexibility, allowing for precise positioning and easy storage of the guide plate.
Implementation Method 1
two resilient elements, a band, and a pull ring, wherein the actuating element has a recessed segment defined on a first end thereof and slidably limited by two stop segments of the adjuster, two positioning columns respectively extending from two sides of the recessed segment and configured to fit with the two resilient elements respectively, hence the two resilient elements are accommodated in the connecting room of the adjuster
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.