Chair Angle Adjuster With Friction Wrap for Stepless Recline
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Solution Overview
Problem
Existing angle adjusters for reclining chairs face challenges in reducing size and ease of assembly, with limited stepless adjustment capabilities and noise issues during operation.
Innovation Solution
The design incorporates a winding-and-tightening member with spring elasticity that acts on the rotation shaft portion, eliminating the need for a fixed boss portion and allowing for stepless adjustment of the development angle, while preventing unexpected rotations through controlled frictional forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed boss portion and rotation boss portion structure is used to prevent rotation, then the angle adjuster can prevent unexpected rotations, but the thickness dimension increases and assembly becomes difficult
Solution Approach 1:
The invention extracts the rotation prevention function from the complex fixed boss portion and rotation boss portion structure, implementing it instead through frictional force between the winding-and-tightening member and rotation shaft portion. This eliminates the need for protruding boss portions, thereby reducing the thickness dimension while maintaining rotation prevention capability.
Solution Approach 2:
The invention introduces frictional force as an intermediary mechanism between the winding-and-tightening member and rotation shaft portion. This frictional interaction serves as the mediator to prevent unexpected rotation without requiring mechanical interlocking structures like boss portions, thus achieving a more compact design.
2Reliability
If a fixed boss portion and rotation boss portion structure is used to prevent rotation, then the angle adjuster can prevent unexpected rotations, but the assembling operation becomes difficult
Solution Approach 1:
The invention removes the complex assembly requirements of fixing the winding-and-tightening member to the rotation boss portion. Instead, the friction-based rotation prevention mechanism allows for simpler assembly where the winding-and-tightening member simply needs to engage with the rotation shaft portion through friction, eliminating difficult fixing operations.
3Ease of operation
If gear teeth and ratchet claw engagement is used for angle adjustment, then the structure can provide stepwise adjustment, but the development angle cannot be adjusted steplessly and click noise is produced
Solution Approach 1:
The invention replaces the mechanical gear teeth and ratchet claw engagement system with a friction-based winding-and-tightening mechanism. This substitution eliminates the discrete stepwise engagement that produces click noise, allowing for smooth, stepless angle adjustment while maintaining operational control through frictional forces.
Solution Approach 2:
The invention changes the adjustment mechanism from discrete gear tooth engagement to continuous friction-based control. By varying the frictional force between the winding-and-tightening member and rotation shaft portion, the development angle can be adjusted continuously without the stepwise increments and associated click noise of gear mechanisms.
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 solution enables a compact size reduction of the angle adjuster, simplifies assembly, and allows for quiet, stepless adjustment of the reclining chair's angle without the 'click' noise, ensuring reliable operation and user convenience.
Implementation Method 1
a winding-and-tightening member (5) having spring elasticity, one end portion (5a) and the other end portion (5b) of which are pivotally fixed to the first arm (1) in a rotatable manner
Implementation Method 2
the frictional force acts on the winding-and-tightening member (5) in the winding-and-tightening direction, thereby making it possible to prevent the rotation of the second arm (10) in the reverse rotation direction
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
An angle adjuster (71) is equipped with a first arm (1) provided with a winding-and-tightening member (5) and a second arm (10) provided with a rotation shaft portion (13). As seen in the axial direction of the rotation shaft portion (13), one end portion (5a) and the other end portion (5b) of the winding-and-tightening member (5) are provided at the first arm (1) in a manner in which they are separated from each other. The first arm (1) and the second arm (10) are connected so that the second arm (10) is rotatable centering the rotation shaft portion (13) in a state in which the winding-and-tightening portion (6) of the winding-and-tightening member (5) is wound on the outer peripheral surface (13a) of the rotation shaft portion (13). It is configured so that a rotation of the second arm (10) by a frictional force (SM) and (GM) generated by a rotational movement of the second arm (10) in a forward rotation direction (S) or a reverse rotation direction (G) is allowed or prevented.