Barrel Arbor Mounting for Ultra-Thin Horological Movements
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Solution Overview
Problem
Existing mechanical horological movements have a bulky barrel mounting that obstructs the production of extra-flat timepieces, as the barrel arbor is mounted between a plate and a barrel bar with bearings on both ends, increasing the thickness of the movement.
Innovation Solution
A horological assembly where the barrel arbor is mounted on a rough movement by minimizing bulk in the thickness direction, utilizing a configuration where the arbor has a shoulder extending radially and is slid into a groove on the rough movement, allowing for translation and rotation while minimizing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the barrel arbor is mounted between a plate and a barrel bar with bearings on both ends, then the arbor is securely supported and can rotate freely, but the thickness of the horological movement increases
Solution Approach 1:
The invention extracts the barrel arbor mounting from the traditional two-bearing configuration and relocates it to a single-bearing arrangement on the plate, eliminating the need for the barrel bar and reducing the overall thickness of the movement while maintaining rotational support functionality
Solution Approach 2:
The invention changes the mounting dimension from a vertical two-point support (plate to barrel bar) to a horizontal single-point support (plate only), allowing the arbor to be mounted in a plane that reduces the thickness direction while maintaining structural integrity
Data Source
AI summary
The timepiece assembly (1) is intended for an arbor (81), in particular a barrel arbor, on a blank (91), in particular a bridge or a plate (91), where the arbor (81) comprises a first axis (A80) and a shoulder (82) extending at least in a radial direction relative to the first axis (A80); and the blank (91) comprises a groove (92) that is oriented along a second axis (A90). The arbor and the blank are configured and/or arranged so as to (i) prevent the arbor from moving in translation along a first axis relative to the blank; and (ii) enable the arbor to slide, during assembly, in translation in a groove along the second axis (A90) perpendicular to the first axis.