Chair Leg Frame Groove Locking for Adhesive-Free Decoration Strips
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Solution Overview
Problem
Conventional folding chair decoration strips often fall off due to uneven adhesive application and adhesive deterioration over time, leading to a securement issue.
Innovation Solution
A leg frame design with acute corners and extended ribs on the decoration strip that fits into an engaging groove, utilizing the strip's elasticity for secure engagement without adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive is applied to attach the decoration strip, then the decoration strip can be initially fixed to the leg frame, but the adhesive deteriorates over time causing the decoration strip to fall off
Solution Approach 1:
The patent replaces the chemical adhesive system with a mechanical engagement system. The decoration strip includes engagement protrusions that fit into engagement grooves on the leg frame, creating a mechanical interlocking connection that eliminates the need for adhesive and provides durable, long-lasting attachment without deterioration.
Solution Approach 2:
The decoration strip is segmented with multiple engagement protrusions distributed along its length, and the leg frame has corresponding engagement grooves. This segmentation allows the attachment function to be distributed across multiple contact points, improving overall reliability and preventing complete detachment even if one engagement point fails.
2Reliability
If adhesive is used to attach the decoration strip, then attachment can be achieved, but the adhesive application process is time-consuming and requires precision
Solution Approach 1:
The mechanical engagement system allows for quick assembly by simply inserting the decoration strip into the grooves and engaging the protrusions, eliminating the time-consuming adhesive application process including surface preparation, adhesive application, positioning, and curing time.
Solution Approach 2:
The engagement protrusions and grooves are designed to self-align and self-engage during assembly. The decorative strip automatically finds its correct position as it is inserted into the grooves, eliminating the need for precise manual positioning that adhesive application requires.
3Reliability
If adhesive is applied on the decoration strip, then the strip can be attached to the leg frame, but uneven adhesive application causes the decoration strip to warp and disengage
Solution Approach 1:
The mechanical engagement system eliminates the adhesive application process entirely, removing the source of precision problems. The engagement protrusions and grooves provide inherent alignment and positioning, ensuring uniform distribution of engagement forces along the decoration strip without requiring precise application of any material.
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 ensures the decoration strip remains securely attached to the leg frame, preventing disengagement and offering a quicker, more reliable assembly method compared to adhesive-based attachment.
Implementation Method 1
The decoration strip takes advantage of geometric configuration and elasticity to be engaged between two curved ridges of the leg frame, and therefore does not need adhesive to be securely fixed in place.
Data Source
AI summary
A leg frame of a chair having a decoration strip engaged therein includes the leg frame and the decoration strip. The leg frame includes a frame base, two curved ridges respectively disposed at both edges of the frame base, and an engaging groove formed between the frame base and the curved ridges. An inner lower side of each curved ridge is slanted to form an acute corner between the frame base and the curved ridge. The decoration strip corresponding to the engaging groove is fitted in the engaging groove. The decoration strip includes a bottom surface, two concave side surfaces, and two extended ribs respectively disposed between the bottom surface and the side surfaces. When the decoration strip is engaged with the leg frame, the ribs are respectively engaged with the acute corners and the side surfaces are respectively in contact with the curved ridges.