Angle Adjustment Assembly with Limiting Rod for Foldable Sofa Fixation
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Solution Overview
Problem
Conventional sofa supporting legs lack a mechanism to fix adjustable angles, limiting their functionality in foldable and stretchable sofa designs.
Innovation Solution
An angle adjustment assembly comprising a first connecting piece, a second connecting piece, and a limiting rod, where the limiting rod is axially movable to allow angle adjustment and fixation by engaging with an arc-shaped through hole and expansion grooves, enabling precise control of the sofa's angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the supporting legs are hinged to the sofa seat to enable angle adjustment, then the angle adjustability is improved, but the angle cannot be fixed once adjusted
Solution Approach 1:
The limiting rod is designed with two different diameter sections to enable dynamic functionality: the first section (smaller diameter) allows the supporting leg to rotate and adjust angles by passing through the arc-shaped through hole, while the second section (larger diameter) engages with the expansion groove to fix the angle when needed. This dynamic design resolves the contradiction between angle adjustability and angle fixation.
Solution Approach 2:
The limiting rod changes its effective engagement parameter by axial movement: when the first section engages with the through hole, the connection is rotational and adjustable; when the second section engages with the expansion groove, the connection becomes fixed. This parameter change enables both adjustability and fixation functions.
2Stability of the object's composition
If a limiting rod with two different diameter sections is used to enable both angle adjustment and fixation, then the angle fixation capability is improved, but the device complexity increases
Solution Approach 1:
The limiting rod with two different diameter sections serves multiple functions within a single component: it enables both angle adjustment (through the first section passing through the arc-shaped hole) and angle fixation (through the second section engaging the expansion groove). This multi-functionality reduces the need for separate adjustment and fixation mechanisms, thereby resolving the complexity issue.
Solution Approach 2:
The adjustment function and fixation function are merged into a single limiting rod component rather than requiring separate mechanisms. The rod combines both the adjustment capability (smaller first section) and fixation capability (larger second section) in one integrated part, simplifying the overall assembly.
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 adjustable and fixed angles of the sofa components, enhancing the usability and stability of foldable and stretchable sofa designs by allowing controlled rotation and fixation of the supporting legs.
Implementation Method 1
The limiting rod is configured to be axial moved to make the first section of the limiting rod receive in the through hole or make the second section of the limiting rod receive in the at least one corresponding expansion groove
Data Source
AI summary
An angle adjustment assembly includes a first connecting piece including first side plates, a second connecting piece including second side plate, and a limiting rod. The first side plates are hinged to the second side plates. The first side plates include a through hole that is arc-shaped and centered at a hinge joint of the first side plates and the second side plates. A path of the through hole has at least one expansion groove. The limiting rod is axially movably connected with a corresponding second side plate. The limiting rod includes a first sections and a second section. A diameter of the first section is smaller than a diameter of the second section. A size of the first section matches a size of the through hole. A size of the second section matches a size of the at least one expansion groove.