Fold-Down Chair Tablet Assembly With Torsion Positioning
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Solution Overview
Problem
Conventional fold-down tablets in chairs lack stability and are difficult to operate due to the absence of a positioning or fold assist mechanism, leading to potential user injury and increased complexity and cost in chairs with existing solutions.
Innovation Solution
A fold-down tablet design incorporating a torsion positioning mechanism, a shaft with a protrudent positioning bar, and an armrest with a shaft hole and slot, allowing for horizontal and vertical rotation while restricting movement within a defined angular range, enhancing stability and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional fold-down tablet is connected to a chair only with a shaft without a positioning or fold assist mechanism, then the structure is simple and cost is low, but the tablet is unstable in use and user injury may occur
Solution Approach 1:
The positioning function is segmented into two independent mechanisms: a torsion spring mechanism for horizontal positioning and a positioning bar-slot mechanism for vertical positioning. This segmentation allows each mechanism to perform its specific function simply and effectively, achieving reliable positioning without excessive complexity
Solution Approach 2:
The tablet mechanism transitions from a static fixed connection to a dynamic system with controlled movement. The torsion spring provides dynamic positioning assistance during rotation, while the positioning bar and slot provide dynamic constraints that allow movement within safe angular ranges, improving reliability without requiring a fully rigid structure
2Reliability
If a positioning or rotation mechanism is added to improve tablet stability, then tablet stability improves, but the structure becomes too complicated and cost increases
Solution Approach 1:
The torsion spring mechanism is designed to automatically provide positioning assistance during tablet rotation without requiring external power or complex control systems. The spring self-regulates the rotation motion, providing stable positioning while maintaining manufacturing simplicity through the use of a single elastic component
Solution Approach 2:
The positioning mechanism uses simple, inexpensive components such as a torsion spring, positioning bar, and slot rather than expensive precision mechanisms. These components are easy to manufacture and replace, maintaining cost-effectiveness while achieving the required stability
3Ease of operation
If a fold-down tablet mechanism is designed without positioning assistance, then the structure is simple, but it is difficult to operate and user injury may occur
Solution Approach 1:
The torsion spring is pre-loaded to provide positioning assistance before the user completes the rotation action. This preliminary positioning guidance makes it easier for users to operate the tablet by indicating the correct stopping positions, reducing the risk of improper operation while keeping the mechanism simple
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 provides a stable and labor-saving operation by ensuring the tablet remains positioned securely in both use and storage positions, reducing the risk of user injury and simplifying the mechanism while maintaining cost-effectiveness.
Implementation Method 1
The torsion positioning mechanism includes a casing, a torsion spring, a restriction plate, a sleeve and a seat
Data Source
AI summary
A fold-down tablet used in a chair is disclosed. The tablet includes a board, a torsion positioning mechanism, a shaft and an armrest. The torsion positioning mechanism is fixed to a side of the board for horizontally rotating and positioning the board. The shaft has a protrudent positioning bar and is fixed to the torsion positioning mechanism for making the board vertically rotatable. The armrest has a shaft hole for rotatably receiving the shaft and a slot communicating with the shaft hole. When the board is turned horizontally, the positioning bar is embedded into the slot to be restricted.