Folding Table Leg Linkage With Binding Lock in Closed Position
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Solution Overview
Problem
Folding tables lack an effective mechanism to maintain legs in a closed position, leading to unintended extension and instability during storage and use.
Innovation Solution
A four-bar, four-pivot linkage mechanism with pivotally coupled links and a flexible clamp band that resists movement between open and closed configurations, using an intermediate binding configuration to securely hold the legs in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a leg locking mechanism is added to maintain legs in closed position, then stability during storage is improved, but device complexity increases
Solution Approach 1:
The four-bar linkage mechanism automatically locks the leg in the closed position through its own geometric configuration without requiring separate locking components. The binding configuration between links 38 and 40 self-activates when the leg reaches the closed position, eliminating the need for external locking devices while maintaining stability during storage.
Solution Approach 2:
The leg support structure is divided into distinct functional segments: the four-bar linkage mechanism for locking, the clamp band for securing, and the pivot joints for movement. This segmentation allows each component to perform its specific function efficiently while keeping the overall design manageable and maintainable.
2Reliability
If a four-bar linkage mechanism with binding configuration is used to resist movement, then leg position control is improved, but ease of operation deteriorates
Solution Approach 1:
The mechanism transitions between two dynamic states: a locked binding configuration where links 38 and 40 resist movement through geometric interference, and an unlocked configuration where the leg can be freely positioned. The binding configuration dynamically engages when the leg reaches the closed position and disengages when force is applied to change configurations, providing reliable position control while allowing intentional operation.
Solution Approach 2:
The four-bar linkage is pre-configured with binding geometry that automatically opposes and prevents unintended leg movement before it occurs. The intermediate binding configuration creates preliminary resistance that blocks accidental extension or retraction, ensuring reliable position control while requiring deliberate user action to overcome the binding and change configurations.
3Ease of operation
If a flexible clamp band is used to allow pivot movement through binding configuration, then ease of operation is improved, but reliability of locking deteriorates
Solution Approach 1:
The clamp band's flexibility parameter is specifically engineered to allow controlled deformation during the transition through the binding configuration, enabling easy operation. Once the leg reaches the closed position, the clamp band's elastic properties cause it to tighten and rigidify, transforming from a flexible state during movement to a rigid state during locking, thus maintaining both ease of operation and locking reliability.
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 mechanism effectively maintains the legs in a closed position, preventing unintended extension and enhancing stability during storage and use by requiring user intervention to overcome resistance for configuration changes.
Implementation Method 1
The clamp band can be flexible and resilient to allow the pivot axel to move in the intermediate binding configuration to allow the linkage to move through the intermediate binding configuration between the open and closed configurations
Implementation Method 2
The bars of the linkage are sized and the pivots of the linkage are located to resist movement of the linkage through an intermediate binding configuration between open and closed configurations
Data Source
AI summary
A folding table has a leg pivotally coupled to a bottom of a tabletop. A pair of links is pivotally coupled together and pivotally coupled in series between the tabletop and the leg. The pair of links, the tabletop and the leg form a four-bar, four-pivot linkage, including four pivots and four bars defined between the pivots. The bars of the linkage are sized and the pivots of the linkage are located to resist movement of the linkage through an intermediate binding configuration between open and closed configurations.