Lower-back supporting apparatus, backrest supporting frame and seating unit
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Solution Overview
Problem
Existing lower-back supporting apparatuses in functional sofas and chairs have complex structures, making maintenance inconvenient and limiting their versatility due to restrictive mounting positions.
Innovation Solution
A lower-back supporting apparatus with a simple structure featuring extendable and retractable parts, utilizing links and protrusions to adjust the distance between supporting plates, allowing adaptive mounting and easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a scissor lift structure cooperated with a driving screw is used, then the lower-back supporting apparatus can provide support to the user's back, but the structure becomes complex and maintenance becomes inconvenient
Solution Approach 1:
The lower-back supporting apparatus is divided into independent functional modules: the backrest supporting frame, the lower-back supporting plate, and the extendable and retractable part. This segmentation allows each module to be independently maintained and replaced, reducing overall system complexity while maintaining the support function.
Solution Approach 2:
The complex driving screw mechanism is extracted and replaced with a simpler extendable and retractable part that can be mounted at flexible positions. This extraction eliminates the complexity of the screw structure while preserving the essential support function through alternative means.
2Reliability
If a scissor lift structure cooperated with a driving screw is used, then the lower-back supporting apparatus can provide support to the user's back, but the mounting position becomes restrictive and versatility is reduced
Solution Approach 1:
The mounting position of the extendable and retractable part is made dynamic and flexible, allowing it to be mounted at different locations on the backrest supporting frame. This dynamic mounting capability enables the apparatus to adapt to various sofa and chair configurations, significantly improving versatility while maintaining the support function.
Solution Approach 2:
The lower-back supporting apparatus is designed with universal mounting capabilities that allow it to be installed on different types of seating furniture. The extendable and retractable part can be positioned flexibly to accommodate various mounting scenarios, making the apparatus suitable for multiple applications including sofas, chairs, and other seating units.
3Ease of repair
If the structure is simplified with extendable and retractable parts, then maintenance becomes easier and mounting becomes flexible, but the volume may increase
Solution Approach 1:
The extendable and retractable part is designed to nest within the backrest supporting frame structure when not in use. This nesting arrangement allows the apparatus to maintain a compact overall volume while still providing the flexibility and ease of maintenance associated with the simplified structure. The supporting plate can be stored within the frame boundaries, minimizing volume increase.
Data Source
AI summary
Provided are a lower-back supporting apparatus, a backrest supporting frame, and a seating unit. The lower-back supporting apparatus includes a lower-back supporting plate; a lower mounting plate; two supporting structures, provided between the lower-back supporting plate and the lower mounting plate, hinged to the lower-back supporting plate and the lower mounting plate, respectively; and an extendable and retractable part, including an extendable and retractable end hinged to the lower-back supporting plate or the supporting structure, so as to drive the lower-back supporting plate away or close to the lower mounting plate. The lower-back supporting plate may be lifted and lowered by cooperating the extendable and retractable part with the supporting structure; the volume of lower-back supporting apparatus may be effectively reduced by adopting the extendable and retractable part; the whole of the extendable and retractable part is easy to maintain and replace.