Chair Connector with Threaded Inserts for Seat-to-Base Strength
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Solution Overview
Problem
Chairs often face challenges in securing strong, secure connections between components due to forces tending to pull connectors away from weaker materials, particularly plastic, leading to potential disconnection.
Innovation Solution
A chair design featuring a connector with a channel in the seat for a cross-member of the base, a retention cover engaging with the cross-member, and fasteners securing the retention cover to the seat, utilizing threaded inserts for enhanced stability, and a V-shaped configuration to distribute forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional fasteners are used to connect the base to the seat, then the connection structure is simple, but the connection strength is insufficient due to forces pulling connectors away from weaker materials like plastic
Solution Approach 1:
The connector is divided into multiple functional components: a retention cover that engages with the cross-member, threaded inserts embedded in the seat for enhanced anchoring, and fasteners that secure the retention cover to the seat. This segmentation allows each component to perform its specific function optimally, distributing the connection forces across multiple elements rather than relying on a single fastener.
Solution Approach 2:
The connector assembly combines different materials with complementary properties: the retention cover (likely metal or rigid plastic) provides structural engagement, the threaded inserts (metal) provide secure anchoring in the plastic seat, and the fasteners (metal with threading) provide adjustable clamping force. This composite approach leverages the strengths of each material to achieve overall connection strength.
2Reliability
If forces are concentrated at a single connection point, then the connector structure is simple, but the risk of bending and disconnection increases
Solution Approach 1:
The connection system is segmented into multiple load-bearing elements: the retention cover distributes forces across its engagement surface with the cross-member, the threaded inserts distribute anchoring forces across multiple engagement points in the seat, and the fasteners provide distributed clamping force. This segmentation of force paths prevents concentration of stresses at any single point, reducing the risk of bending and disconnection.
3Strength
If a secure connection is achieved using multiple components, then the connection strength is improved, but the manufacturing complexity increases
Solution Approach 1:
The threaded inserts are pre-installed into the seat during seat manufacturing, creating prepared receptacles for the fasteners. The retention cover is designed with pre-formed engagement features for the cross-member. These preliminary actions during manufacturing stages simplify final assembly, as the connector components simply need to be engaged with the pre-prepared features rather than requiring complex multi-step assembly procedures.
Data Source
AI summary
A chair includes a seat and a base attached to the seat. A connector is configured to secure the seat to the base. The seat is configured to support a user sitting on the chair, and the base is configured to support the seat relative to a surface beneath the chair. The connector includes a channel formed in the seat for receiving a cross-member of the base, a retention cover configured to extend into the channel to engage with the cross-member, and a plurality of fasteners configured to couple the retention cover with the seat to hold the cross-member in the channel.