Chronograph Control Device Lever Spring Resistance
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Solution Overview
Problem
Existing chronograph control devices with two pushers often exhibit dependent functions and inconsistent resistance sensations, failing to maintain equal resistance for both pushers, especially when one is actuated more frequently than the other.
Innovation Solution
A chronograph control device featuring a first pivotally mounted lever actuated by a first pusher and a second pivot-mounted lever actuated by a second pusher, with a spring mounted on the second lever, where the arm and spring move relative to each other to ensure consistent resistance based on the spring's restoring force and geometry, allowing for equal resistance sensations by adjusting the lever arm ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a spring is shared between two pushers to provide restoring force, then the resistance sensation can be made equal for both pushers, but the functions of the two pushers become dependent on each other
Solution Approach 1:
The patent divides the spring system into two independent springs, each dedicated to one pusher. This segmentation allows each pusher to have its own independent restoring force, ensuring both function independence and consistent resistance sensation without the coupling problem of a shared spring.
Solution Approach 2:
The patent introduces an intermediary lever mechanism that translates the motion of one pusher into motion of the other through a controlled coupling. This intermediary allows the pushers to be mechanically linked for coordinated operation while maintaining independent spring systems, thus preserving both independence and functional coordination.
2Adaptability or versatility
If separate springs are used for each pusher to maintain function independence, then the functions remain independent, but the resistance sensations may become inconsistent especially when one pusher is actuated more frequently
Solution Approach 1:
The patent employs parameter changes by making the spring characteristics (force constant, pre-load) adjustable or variable. This allows the resistance sensation to be tuned and maintained consistent for both pushers even with different usage frequencies, while each pusher retains its own independent spring system.
Solution Approach 2:
The patent introduces dynamic elements such as adjustable spring pre-loads or variable stiffness mechanisms that can adapt to different usage patterns. This dynamic adjustment capability ensures consistent resistance sensation for both pushers while maintaining their functional independence.
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 independent functions for both pushers while providing a consistent resistance sensation, maintaining the ratio of resistances constant regardless of usage frequency, by leveraging the spring's restoring force and geometry, thus enhancing user experience.
Implementation Method 1
A spring (30) is mounted on the second lever (22)... the arm (26) and the spring (30) move relative to one another so that the arm (26) is always subjected to the restoring force of the spring (30)
Data Source
Figure 1~2
AI summary
The present invention relates to a chronograph control device comprising a first pivoting lever, actuated by a first pusher, and limited in its movement towards the first pusher by a first stop, and a second pivoting lever, actuated by a second pusher, and limited in its movement towards the second pusher by a second stop. A spring is mounted on the second lever. The first lever is associated with an arm equipped with a beak, said beak cooperating with the spring such that when either of the two levers is actuated by one of the pushers, the beak and the spring move relative to each other such that the beak is subjected to the restoring force of the spring.