Lever Escapement Dual Time Zone Segmentation
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Solution Overview
Problem
Conventional lever escapements for timepieces typically only allow for a single time zone display, lacking the capability to efficiently indicate different time zones simultaneously.
Innovation Solution
The introduction of a second escapement wheel set driven by a separate gear train, with additional impulse and rest pallets, allows for two separate escapement mobiles to operate independently, enabling dual time zone display by coordinating the impulses and rest phases between the two mobiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single escapement wheel set is used, then the device complexity is reduced, but the time zone display capability is limited to one zone
Solution Approach 1:
The escapement mechanism is segmented into two independent escapement wheel sets (first and second escapement wheels), each capable of driving a separate hour hand to indicate different time zones. This segmentation allows the mechanism to display multiple time zones simultaneously while maintaining the simplicity of individual single-wheel escapement designs.
2Adaptability or versatility
If two separate escapement wheel sets are used, then dual time zone indication is enabled, but the dimensional size of the mechanism increases
Solution Approach 1:
The two escapement wheel sets are merged into a single escapement mechanism that shares common components including the balance wheel, anchor, and impulse pallets. The first and second escapement wheels are positioned to interact with the same impulse pallets during the balance wheel's oscillation cycle, allowing dual time zone indication within a compact footprint rather than requiring two separate escapement mechanisms.
Solution Approach 2:
The escapement wheels are arranged in a spatial configuration where they operate in different angular dimensions around the balance wheel. The first escapement wheel interacts with impulse pallets during one half of the oscillation cycle, while the second escapement wheel interacts during the other half, effectively utilizing the temporal and spatial dimensions of the balance wheel's motion to accommodate both time zone indications without increasing the planar area.
3Adaptability or versatility
If additional impulse and rest pallets are added for the second escapement wheel, then the dual time zone functionality is achieved, but the manufacturing complexity increases
Solution Approach 1:
The impulse pallets are designed with multi-functionality to interact with both the first and second escapement wheels. The same impulse pallets that receive impulses from the first escapement wheel also receive impulses from the second escapement wheel during different phases of the balance wheel oscillation. This universality reduces the number of unique pallet components needed and simplifies the manufacturing process compared to having completely separate pallet sets for each escapement wheel.
Data Source
Figure 1~2
Figure 3~6
Figure 7~10
AI summary
The escapement has two distinct escapement mobiles (1, 2) driven by respective gear trains. A scale carries a pin (4), and a pulse pallet (5) is arranged to cooperate with teeth that carries the mobile (1). A pallet (6) is articulated on a pivot (7), and another pulse pallet (9) is arranged to cooperate with teeth of the mobile (1). A plate carries a third pulse pallet (12) cooperating with teeth that carries the mobile (2). The pallet (6) has fourth pulse pallet (13) cooperating with the teeth of the mobile (2), and rest pallets (14, 15) cooperates with the teeth of the mobile (2).