Rocking Chair Back Support Assembly with Dynamic Posture Adjustment
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Solution Overview
Problem
Conventional office chairs that rock back and forth often fail to provide adequate back support when the user tries to sit upright, leading to poor posture and discomfort, especially during long periods of work.
Innovation Solution
A back support assembly within the chair that includes a curved, rigid back support and a force generating strap system, allowing the back support to rotate outwardly when the chair tilts forward and inwardly when it tilts backward, ensuring continuous support and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the chair back is kept upright to allow the user to sit close to the work surface, then the user can work efficiently, but the user's back is spaced from the chair back and receives no support leading to poor posture and discomfort
Solution Approach 1:
The back support is designed to be movable rather than fixed, allowing it to rotate between a retracted position (when chair rocks backward) and a protruding position (when chair rocks forward). This dynamic adjustment ensures the back support is only active when needed, resolving the contradiction between maintaining work proximity and providing back support.
Solution Approach 2:
The back support system uses the chair's own rocking motion to automatically activate or deactivate the back support function. When the user rocks the chair forward, the back support automatically protrudes to provide support; when rocked backward, it automatically retracts. This self-activating mechanism eliminates the need for separate control systems.
2Ease of operation
If a fixed back support is added to the chair, then back support is provided, but the user cannot lean completely back and recline against the chair back
Solution Approach 1:
The back support is designed with rotational freedom at its connection point to the chair back. This allows the support to move relative to the chair back, enabling it to be positioned for forward-leaning support or retracted to allow full backward reclining. The dynamic positioning resolves the contradiction between providing support and allowing recline versatility.
3Ease of operation
If the back support protrudes outwardly when the chair rocks forward, then proper back posture is maintained, but the mechanism becomes more complex
Solution Approach 1:
The mechanism uses the natural rocking motion of the chair to automatically drive the back support's protrusion and retraction. The force generating strap converts the chair's rocking motion directly into back support movement without requiring separate actuators, motors, or complex control systems. This self-activating approach maintains posture while minimizing mechanical complexity.
Solution Approach 2:
The back support mechanism is integrated with the chair's existing rocking structure. The force generating strap connects to the chair's base and utilizes the same rocking motion that the user naturally employs. By merging the back support activation with the chair's inherent movement, the system avoids adding independent complex 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
Maintains proper posture and enhances user comfort by providing consistent back support regardless of the chair's tilt position, reducing the risk of lower back pain.
Implementation Method 1
The force generating strap remains stationary in the vertical direction relative to the back of the chair regardless of whether the chair seat and chair back tilt backwards or forwards
Implementation Method 2
The opposite end of the force generating strap carries a pair of rollers that lay and roll on a low friction roller pad affixed to the inside of the backing
Data Source
AI summary
A back support assembly for the back of a chair that rocks back and forth. The back of the chair includes a front that is spaced from and pivotally coupled to a rear. The front of the chair back is rotatable towards and away from the back of a user. A back support pushing arm within the back of the chair is pivotally coupled to the rear of the chair back and rotatable between a first position at which to apply a pushing force against the front of the chair back when the chair rocks forwards and a second position when the user leans back, the chair rocks backwards, and the front of the chair rotates towards the rear. A force generating strap within the chair back contacts and urges the back support pushing arm to rotate to the first position lying against the front of the chair back.