Watch Strap Eccentric Clasp Mechanism for Glove Operation
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Solution Overview
Problem
Traditional watch straps have limited adjustment ranges and are difficult to put on or take off, especially when wearing gloves, and may not provide adequate retention during high-acceleration activities.
Innovation Solution
A watch strap system with a claspless design featuring a flexible blade that slides between a cap and a lever, hinged on the case, using an eccentric mechanism for adjustment and retention, allowing easy donning and doffing and suitable for various materials like leather or synthetic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional clasps are used, then retention is ensured, but ease of operation deteriorates (impossible to handle with gloves)
Solution Approach 1:
The patent removes the traditional clasp mechanism entirely from the watch strap system. Instead of using a separate clasp component that requires manual manipulation, the retention function is integrated directly into the strap attachment mechanism itself, allowing the strap to be secured without any additional clamping or fastening actions that would be difficult to perform with gloves.
Solution Approach 2:
The strap attachment mechanism is designed to automatically secure itself to the watch case without requiring manual intervention. The integration of the retention function into the attachment mechanism allows the system to self-secure when the strap is put on, eliminating the need for users to manually operate complex clasp mechanisms.
2Reliability
If traditional clasps are used, then retention is ensured, but device complexity increases (expensive and include blunt protruding parts)
Solution Approach 1:
The patent combines the attachment function and retention function into a single integrated mechanism. The strap attachment point directly incorporates the retention feature, eliminating the need for separate clasp components. This merging reduces the number of parts, simplifies the overall structure, and removes expensive elements like protruding clasps while maintaining secure retention.
3Ease of operation
If elastic material is used, then ease of operation improves, but retention deteriorates (insufficient retention during high acceleration)
Solution Approach 1:
The patent employs a composite construction where the strap incorporates both elastic material for comfort and ease of adjustment, and rigid or semi-rigid components at the attachment points for secure retention during high-acceleration activities. This combination allows the strap to be easy to put on and adjust while maintaining sufficient retention strength during sports activities.
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
Enables a wide range of adjustment, easy handling with gloves, and secure retention during use, including sports activities, while being cost-effective and easily exchangeable.
Implementation Method 1
the lever comprising an eccentric, which is integral with the lever in the vicinity of the axis of rotation and is provided in order to clamp the free end of the blade against the cap
Implementation Method 2
the eccentric comprises a knurling over all or part of its surface
Data Source
AI summary
Watch comprising at least one case and a strap formed by a flexible blade with a first end fixed to the case and a second opposite end provided to cooperate with a device for attaching and adjusting the length of the strap. According to the invention, the adjustment device comprises a clasp formed by a cap and a lever between which the flexible blade slides, the clasp being hinged on the case by linking means which define an axis of rotation about which the lever can undergo a rotation in order to be able to move into an open position and into a closed position, the lever comprising an eccentric which is integral with the lever in the vicinity of the axis of rotation and is provided in order to clamp the free end of the blade against the cap and to retain the strap when the lever is in the closed position.