Ceramic Knob Insert Grooves for Secure Threaded Retention
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Solution Overview
Problem
Ceramic knobs, being brittle, cannot form screw threads or receive threaded members, leading to inadequate retention of threaded inserts when forced into the knob and held with adhesive, as existing solutions fail to ensure secure attachment.
Innovation Solution
A threaded insert with adhesive grooves extending parallel to the axis and circumferentially, receiving adhesive that is forced upwardly as the insert is depressed into the knob, providing a secure attachment by filling axial and circumferential passages for enhanced retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If threaded inserts are forced into the bore and held with adhesive, then the insert can be attached to the ceramic knob, but the retention is inadequate and the insert is not securely retained
Solution Approach 1:
The adhesive groove is segmented into multiple circumferential channels that extend axially through the insert. This segmentation allows adhesive to be distributed along the entire axial length of the insert, creating multiple bonding zones that collectively provide strong and reliable retention, overcoming the inadequacy of single-point adhesive application.
Solution Approach 2:
The adhesive groove transitions from a simple circumferential channel to a three-dimensional structure with axial extension and radial branching. This dimensional expansion creates a complex adhesive distribution network that fills voids and creates mechanical interlocking, significantly enhancing retention strength and reliability compared to traditional two-dimensional adhesive application.
2Adaptability or versatility
If ceramic knobs are used for furniture closures, then aesthetic and decorative functions are achieved, but the material cannot form screw threads or receive threaded members
Solution Approach 1:
A metal threaded insert is nested within the ceramic knob body. The insert contains internal screw threads that can receive threaded members, while the external diameter of the insert matches the bore in the ceramic knob. This nesting approach allows the ceramic knob to gain threading functionality without requiring the ceramic material itself to be threaded, preserving both aesthetic qualities and functional capability.
Solution Approach 2:
The metal threaded insert acts as an intermediary between the ceramic knob and the threaded member (screw or bolt). Since ceramic cannot directly form or receive threads, the metal insert serves as a mediating component that provides the threading interface while being securely retained within the ceramic body through adhesive bonding in the axial direction.
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 solution ensures a firm and secure attachment of the threaded insert within the ceramic knob, eliminating the issue of inadequate retention by utilizing adhesive grooves and passages to securely hold the insert in place.
Implementation Method 1
adhesive which is forced upwardly by a hydraulic force caused as the insert 24 is depressed into the knob 22
Data Source
AI summary
A knob is formed of a relatively brittle material, and has a bore to receive an insert. The insert is received in the bore, and includes an internal bore to receive a fastener member to secure the knob to an underlying structure. The insert is formed with an axial passage on an outer surface of the insert. The axial passage is between the insert and an inner surface of the bore in the knob. The insert extends into the bore along an axial direction. The axial passages extend with at least a component in an axial direction. The adhesive is received in the bore in the knob, and moves upwardly into the axial passage in the insert.