Adjustable Chair Foot Ring Locking for Independent Height Setting
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Solution Overview
Problem
Conventional furniture frames with foot rings lack user-friendly vertical adjustment capabilities, as the foot ring's height is often fixed or adjusted in conjunction with the support column, failing to accommodate individual user preferences for comfort.
Innovation Solution
A furniture frame design featuring a fastening device with a first threaded bushing on the support column and a second threaded bushing on the foot ring, allowing axial displacement and rotational movement, along with a locking element that enables independent vertical adjustment of the foot ring, enabling user-friendly positioning and secure locking in desired heights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the foot ring is affixed to the support column with a fixed predefined height, then the structure is simple and stable, but the user comfort and adaptability are reduced
Solution Approach 1:
The fastening device transforms the static foot ring attachment into a dynamic system where the foot ring can be adjusted to different heights along the support column. The threaded bushing mechanism allows the foot ring to move axially and be positioned at various heights, converting a fixed structure into an adjustable one that adapts to user needs.
Solution Approach 2:
The fastening device is divided into separate functional components: a first threaded bushing on the support column, a second threaded bushing on the foot ring, and a locking element. This segmentation allows each component to perform its specific function independently, enabling height adjustment while maintaining structural integrity.
2Ease of operation
If the foot ring height is adjusted independently of the support column, then user comfort is improved, but the device complexity increases
Solution Approach 1:
The threaded bushing mechanism enables the foot ring to be adjusted by simple rotational movement, allowing users to easily change the height without requiring complex tools or mechanisms. The self-contained threading system provides intuitive operation where rotation directly translates to axial displacement.
Solution Approach 2:
The adjustment mechanism changes the positional parameter of the foot ring along the axial direction of the support column. By rotating the second threaded bushing relative to the first, the axial position of the foot ring is varied, enabling independent height adjustment while maintaining a relatively simple mechanical structure.
3Reliability
If the locking element prevents relative movement between threaded bushings, then the foot ring position is stable under load, but the adjustment mechanism becomes more complex
Solution Approach 1:
The locking element is extracted as a separate, movable component that can be independently positioned to either engage with the threaded bushings for stabilization or disengage to allow adjustment. This separation allows the locking function to be added without fundamentally complicating the threaded adjustment mechanism.
Solution Approach 2:
The locking element transitions between two dynamic states: engaged (preventing relative movement between bushings for stability under load) and disengaged (allowing rotational adjustment). This dynamic switching capability provides both adjustment ease and position stability without requiring a permanently complex structure.
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 easy, user-friendly vertical adjustment of the foot ring independently of the support column's height adjustment, enhancing user comfort and adaptability, while preventing unintended displacement under load.
Implementation Method 1
The fastening device contains a first threaded bushing arranged coaxially with the support column, non-rotatably connected to the support column and having an external thread, as well as a second threaded bushing arranged coaxially with the support column, non-rotatably connected to the foot ring and having an internal thread. The internal thread of the second threaded bushing engages with the external thread of the first threaded bushing
Data Source
AI summary
A furniture frame contains a support column, a furniture leg to support the support column, a foot ring, and a fastening device affixing the foot ring to the support column. The fastening device contains a first threaded bushing being non-rotatably connected to the support column and has an external thread, and a second threaded bushing being non-rotatably connected to the foot ring and has an internal thread. The internal thread engages with the external thread. The second threaded bushing is rotatable about the first threaded bushing by at least one revolution such that the second threaded bushing can be axially moved relative to the first threaded bushing. The fastening device has as a locking element which prevents a relative movement between the first and the second threaded bushing in a first operating position and enables relative movement between the first and the second threaded bushing in a second operating position.