Chair Frame Joint With Dual Leg Receptacles for Uneven Ground
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Solution Overview
Problem
Conventional chair joints for collapsible chairs face issues with uneven positioning and potential damage when folded legs are obstructed on uneven ground, as they require extended portions to maintain chair height, leading to detachment or damage.
Innovation Solution
A joint design with recesses on either side of the body, allowing the leg to adjust between two configurations, featuring a sidewall slot for cord passage and a channel to secure the cord, enabling smooth transition between deployed and stowed positions without obstructing space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If extended portions are added to joints to maintain chair height, then chair height is preserved, but the space for folded legs becomes obstructed on uneven ground
Solution Approach 1:
The joint body incorporates multiple recesses positioned at different locations and orientations (first recess for deployed position, second recess for folded position, third recess for alternative folded position). This spatial arrangement in multiple dimensions allows the leg to be securely received in various configurations without requiring extended portions that would obstruct space on uneven ground.
2Adaptability or versatility
If legs are folded to 90 degrees and secured underneath the horizontal member, then chair collapsibility is achieved, but legs may detach or become damaged on uneven ground
Solution Approach 1:
The joint body is segmented into multiple functional recesses: a first recess for receiving the leg in deployed configuration, a second recess for receiving the leg in folded configuration, and a third recess for alternative positioning. This segmentation allows the leg to be securely received in different configurations without requiring extended portions that would obstruct space on uneven ground.
Solution Approach 2:
The joint body serves multiple functions through its different recesses: it allows the leg to be received in deployed position, folded position, and alternative folded position. This multi-functionality enables the chair to be used in various configurations while maintaining reliability on uneven ground without requiring extended portions.
3Adaptability or versatility
If recesses are positioned laterally offset from each other, then leg transition between configurations is enabled, but cord passage becomes complex
Solution Approach 1:
A cord passage is provided in the joint body that connects the different recesses. This intermediary passage allows the cord to move smoothly between the first recess, second recess, and third recess as the leg transitions between deployed and folded configurations, simplifying the overall structure while enabling configuration adjustment.
Data Source
AI summary
A joint to connect frame members to form a frame of a chair. The joint has a first receptacle to receive a leg in a first position in which the leg extends in a first direction to support the frame of the chair at a distance above a surface, the leg attached to the frame via a cord. The joint has a second receptacle to receive the leg in a second position in which the leg extends in a second direction, opposite to the first direction, so that the joint rests on the surface, the second receptacle having an axially-oriented slot along a sidewall thereof to allow the cord to pass through into a central portion of the second receptacle.