Monolithic Lever Escapement for Watchmaking Adjustment
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Solution Overview
Problem
The adjustment of escapement mechanisms in mechanical watchmaking is complicated by the presence of clamps, which require consideration of multiple positions, making it delicate and prone to errors.
Innovation Solution
A Swiss lever escapement design featuring a monolithic lever with integrated impulse, rest, and stop pallets, eliminating the need for external clamps by using a convex stop pallet to interact with the escape wheel, allowing for pulling and blocking functions without external stops, and made from monocrystalline materials like silicon to optimize friction and prevent fouling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional Swiss lever escapement with separate pallets and stops is used, then the escapement can perform pulling and blocking functions, but the adjustment becomes complicated and delicate due to multiple positions and interactions
Solution Approach 1:
The patent merges the stop pallet and push pallet into a single integrated component called a 'lever'. This lever is inscribed in a general plane and has a fork at its free end to cooperate with the balance wheel, while its stem engages with the escape wheel. This integration eliminates the need for separate stops and simplifies the adjustment process while maintaining the escapement's pulling and blocking functions.
Solution Approach 2:
The lever component performs multiple functions simultaneously: it acts as both the stop pallet and push pallet, provides the fork for balance wheel engagement, and serves as the engagement element with the escape wheel. This multi-functionality reduces the number of separate components needed and simplifies the overall adjustment procedure.
2Ease of manufacture
If multiple separate components (pallets, stops, forks) are used, then the escapement can achieve precise function separation, but the number of parts increases and adjustment becomes more difficult
Solution Approach 1:
The patent combines multiple separate components (stop pallet, push pallet, fork) into a single monolithic lever structure. This reduces the number of parts that need to be assembled and adjusted, making the manufacturing and assembly process easier while maintaining the precise functional separation through the lever's geometric design.
Solution Approach 2:
While the lever is a single component, it is segmented functionally into distinct zones: the fork portion for balance wheel engagement, the stem portion for escape wheel engagement, and the pallet portions for pulling and blocking. This functional segmentation within a unified structure achieves both simplicity in assembly and precision in function.
3Reliability
If external stops are used with the pallets, then the blocking function is achieved, but the interaction between multiple components increases the risk of fouling and adjustment errors
Solution Approach 1:
The stop function is integrated directly into the lever structure itself, eliminating the need for separate external stops. The lever's stem portion engages directly with the escape wheel teeth, providing the blocking function without requiring additional components that could introduce fouling or adjustment errors.
Solution Approach 2:
The patent extracts the stop function from the traditional separate stop component and incorporates it into the lever itself. This removes the potential source of fouling between separate stop and pallet components while maintaining the reliable blocking function through the lever's direct engagement with the escape wheel.
Data Source
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AI summary
The invention relates to an improved lever for a Swiss lever escapement and to an improved escapement, which enable the timing operations to be simplified by doing away with outer banking pins. The lever is made of an integral part, comprising a rod (12) defining a general plane in which the lever (10) lies, and provided, at the free thereof, with a fork (14) for interacting with a balance (17), wherein the lever is extended by two arms (20) on the side opposite that of the fork (14). Each arm (20) comprises: an impulse and rest pallet (22); a stop pallet (26) that is separate from the first lever and protrudes, relative to the arm (20), in said general plane, said stop pallet (26) having, at the end thereof, a convex portion defining a point of contact with an escapement wheel (24).