Ball-Jointed Office Chair Seat Panel for Dynamic Sitting
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Solution Overview
Problem
Existing office chairs with rigid connections between the seat and backrest limit user movement, leading to static positions that can cause muscular discomfort and increase the risk of injury during sudden movements.
Innovation Solution
An office chair design featuring a ball joint at the front and compression springs at the rear, allowing independent sideways tilting of the seat panel, with tilt limiters to prevent excessive movement and a locking mechanism for user control, enabling a 360-degree pivot and reducing the risk of back injury.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid connection between seat panel and backrest is used, then structural stability is improved, but user movement freedom deteriorates
Solution Approach 1:
The chair is divided into independent movable segments: the seat panel can tilt sideways independently via a ball joint mechanism, while the backrest remains fixed. This segmentation allows the seat to adapt to user movements without compromising the overall structural stability of the chair frame and backrest connection.
2Ease of operation
If the seat panel is allowed to move freely, then user comfort is improved, but structural control deteriorates
Solution Approach 1:
The ball joint mechanism changes the movement parameters of the seat panel, allowing controlled rotation around a central axis. The joint permits sideways tilting within a specific angular range while preventing uncontrolled movement in other directions, thus maintaining structural control while improving user comfort through increased movement freedom.
3Adaptability or versatility
If sideways tilting mechanism is added, then movement promotion is improved, but device complexity deteriorates
Solution Approach 1:
The ball joint mechanism uses a spherical geometry to enable sideways tilting movement. The ball-shaped pivot point allows natural rotation in multiple directions while maintaining a simple mechanical structure, avoiding the need for complex articulated mechanisms or multiple linkage systems.
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 design promotes dynamic sitting, reducing muscular discomfort and the risk of injury by allowing greater user mobility and adjustable movement, enhancing comfort and safety during prolonged sitting periods.
Implementation Method 1
The rear of the seat is essentially floating on two compression springs spaced evenly away from the central plane
Implementation Method 2
This ball joint is formed from two half spheres forming a complementary shaped housing enclosing said ball... This arrangement essentially creates a 360 degree pivot around the centre point of said ball joint
Data Source
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AI summary
An office chair comprises a seat element (3) mounted movably on a fixed support element (1) and a back support element (2). The arrangement simultaneously allows the seat element (3) to move and tilt backwards when the user leans backwards. The seat element (3) carries the chair seating panel (4) in such a way that when the user leans to a side, said chair seating panel (4) tilts to the same side according to the user's movement and independently of said chair's back element (2).