Retractable Ceramic Pin Watch Strap Attachment
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Solution Overview
Problem
Existing solutions for fixing a wristband to a watch case lack reliability, robustness, user-friendliness, and aesthetic appeal, as they often result in unintended detachment, wear, and compromised esthetic compatibility with high-end timepieces.
Innovation Solution
A device comprising a connecting element with retractable pins and a receiving element, utilizing ceramic materials for reduced friction and enhanced durability, allowing for two configurations: a retracted position for easy removal and a projecting position for secure attachment, with an attached element for aesthetic integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pin is used to fix the wristband to the watch case, then the attachment is secure and reliable, but the pin is subject to wear that deteriorates functionality over time
Solution Approach 1:
The patent replaces the traditional metal pin with a ceramic pin (made of sintered ceramic material). This substitution maintains the mechanical fastening function while eliminating wear between the pin and the wristband link, as ceramic does not wear against metal or other ceramic surfaces. The ceramic pin provides both the reliability of secure attachment and the durability of wear resistance, resolving the contradiction between attachment reliability and pin service life.
Solution Approach 2:
The patent uses composite construction by combining ceramic material for the pin with metal components for the connecting element and receiving element. The ceramic pin interfaces with metal surfaces, creating a composite system where each material contributes its superior properties: ceramic provides wear resistance and low friction, while metal provides structural strength and machinability. This composite approach resolves the contradiction by allowing the pin to be wear-resistant while maintaining overall attachment reliability.
2Reliability
If the pin is fixed in position for secure attachment, then the wristband is reliably retained, but the wristband cannot be easily removed and replaced
Solution Approach 1:
The patent makes the pin dynamic rather than fixed by allowing it to move axially within a housing. The pin can be pushed to retract from the receiving element, enabling easy wristband removal, and then pushed forward to engage with the link, providing secure attachment. This dynamic positioning resolves the contradiction between reliable retention (when engaged) and ease of operation (when disengaged).
Solution Approach 2:
The patent segments the fastening function into two independent actions: the pin's axial movement for engagement/disengagement and the wristband's articulation for wear comfort. The pin is housed in a separate housing that allows independent movement, decoupling the removal operation from the attachment operation. This segmentation allows the wristband to be easily removed by simply retracting the pin, while maintaining secure attachment when engaged.
3Ease of manufacture
If traditional fixing devices are used, then the wristband can be attached to the watch case, but the appearance is compromised and incompatible with high-end timepieces
Solution Approach 1:
The patent nests the pin within a housing that is integrated into the connecting element, and the connecting element is received within the receiving element's opening. This nested arrangement conceals all fastening components (pin, housing, connecting element) within the structural openings of the watch case lugs, leaving no external visible elements. The functional attachment mechanism is fully contained, resolving the contradiction between attachment functionality and aesthetic appearance.
Solution Approach 2:
The patent introduces a ceramic pin as an intermediary between the metal connecting element and the metal receiving element. The ceramic material provides a visually distinct, high-gloss surface that enhances aesthetic appearance while maintaining mechanical functionality. The ceramic pin acts as a mediating element that improves both appearance and performance, resolving the contradiction between functionality and aesthetics.
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 provides a reliable, robust, and user-friendly attachment system that minimizes wear and maintains an attractive appearance, ensuring secure and easy attachment of the wristband while being compatible with high-end timepieces.
Implementation Method 1
The pins are made of a material for limiting frictional wear, such as a sintered ceramic
Data Source
AI summary
The device for fastening a strap strand to a watch middle includes a connecting element (11) for connection to a strap strand (10) or a watch middle (20), at least one pin (1), a receiving element (21), connected to the other of the watch middle (20) or the strap strand (10), and at least one insert element (2). The device is designed to occupy at least two configurations: a first configuration, in which the at least one pin (1) is free to translate within a recess (11a) of the connecting element (11), to be able to occupy a position projecting from the connecting element (11) and a position set back into the recess (11a); and a second configuration, in which the at least one insert element (2) cooperates with the at least one pin (2), to hold it in its position projecting from the connecting element (1).