Watch Strap Interchangeable Fixing Device with Movable Pivot
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Solution Overview
Problem
Existing watch bracelet fixing devices require tools for separation, are costly to manufacture, and may injure the wearer due to prominent elements, limiting interchangeability and convenience.
Innovation Solution
A device featuring a central horn with a movable pivot and handling means, including a cylindrical body and fin, allows for easy mounting and disassembly of the bracelet without tools, using a nested assembly with a recess and return mechanism, enabling quick and secure attachment and detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bar with pistons and elastic member is used to fix the bracelet, then the bracelet can be securely attached to the watch case, but a special tool is required to detach the bracelet
Solution Approach 1:
The bracelet fixing device enables the wearer to detach and reattach the bracelet independently without requiring external tools. The piston can be manually actuated through the tube to release the bracelet from the horn, and the elastic member automatically returns the piston to its initial position to secure the bracelet, making the system self-sufficient for user operations.
2Ease of operation
If a radial finger actuating member is mounted on the piston, then the bracelet can be detached without tools, but the device becomes more complex and may injure the wearer
Solution Approach 1:
The potentially harmful radial finger actuating member is extracted from the design. Instead, a simple piston actuated through the tube wall is used, eliminating prominent elements that could catch on or injure the wearer while maintaining the ability to detach the bracelet without tools.
3Adaptability or versatility
If major structural modifications are made to the bar and pistons to enable tool-free detachment, then interchangeability is improved, but manufacturing costs increase significantly
Solution Approach 1:
The fixing device is segmented into separate functional components: a bar element with a through-opening, a piston that moves within the bar, an elastic member for automatic return, and a horn with a receiving cavity. This modular segmentation allows each component to be manufactured independently using standard processes, avoiding the need for complex structural modifications and reducing overall manufacturing costs while enabling interchangeability.
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 easy and secure interchangeability of bracelets without additional manufacturing costs or risk of injury, providing a convenient and cost-effective solution for watch users.
Implementation Method 1
an elastic member arranged between said pistons and tending to drive them towards the outside of the tube
Implementation Method 2
the movable pivot being arranged to engage in a corresponding hole of the horn
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3c
AI summary
The invention relates to a device for attaching a watch strap to a watch case. The device comprises, on the one hand, a bar attached to the watch case by means of a lug, and on the other hand, an insert attached to the end of the strap. The bar and the insert are complementary and cooperate by interlocking, forming removable assembly means to make the strap interchangeable. According to the invention, the insert includes a movable pivot mounted within the insert. This movable pivot is arranged to engage in a corresponding hole in the lug. The device includes manipulation means attached to the movable pivot such as to move from a first position in which the pivot is free to move and the strap can be attached and/or detached, to a second position in which the pivot is fixed in translation and the strap is locked onto the watch case.