Horological Axial Stop Bolt for Easy Wheel Removal
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Solution Overview
Problem
Existing solutions for limiting the axial travel of moving bodies in horological movements, such as hour wheels, require tedious manual manipulation and can lead to dimensional uncertainties and control issues due to deformations of dial or structure elements, complicating maintenance and clearance control.
Innovation Solution
A bolt with a head and arbor design that allows axial holding and easy removal of moving bodies, featuring a radial addendum, bearing base, and rotational positions to limit axial travel, reducing friction and facilitating assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dial or structure element is used to limit axial travel of the moving body, then the axial travel is limited, but the removal of the moving body becomes tedious and time-consuming
Solution Approach 1:
The axial stop function is segmented from the dial or structure element and implemented as a separate bolt component. This allows the bolt to be independently manipulated for limiting axial travel while facilitating easier removal of the moving body during maintenance operations.
Solution Approach 2:
The axial stop function is extracted from the integrated dial or structure element and implemented as a separate, removable bolt component. This extraction allows the bolt to be independently manipulated for limiting axial travel while facilitating easier removal of the moving body during maintenance operations.
2Reliability
If the dial or structure element is used to limit axial travel, then the axial stop is formed, but dimensional uncertainties and deformations occur
Solution Approach 1:
The axial stop function is segmented from the dial or structure element and implemented as a separate bolt component with precisely controlled dimensions. This segmentation isolates the dimensional control requirements to the bolt manufacturing process, enabling better precision control through dedicated tooling and quality assurance.
Solution Approach 2:
The bolt is designed with precisely controlled dimensional parameters including the radial addendum height, arbor diameter, and head dimensions. These parameters are optimized during design to provide reliable axial stop formation while accommodating manufacturing tolerances and minimizing deformations.
3Reliability
If the radial addendum faces the moving body in blocking position, then axial travel is limited, but friction increases during rotational movement
Solution Approach 1:
The bolt is designed to rotate between unlocking and blocking positions, dynamically adjusting the position of the radial addendum relative to the moving body. In the blocking position, the radial addendum faces the moving body to limit axial travel, while the rotational capability allows the bolt to be positioned optimally to minimize friction during rotational movement.
Data Source
AI summary
A bolt (10) configured to limit the axial travel of a moving body (21) of a horological movement (20). The bolt includes a head (11) arranged at the end of an arbor (12) extending according to a longitudinal axis of revolution, the head (11) extending radially with respect to the arbor (12) and including over a portion of its periphery, a radial addendum (110) configured to be arranged opposite said moving body (21), and including, at the interface with the arbor (12), a bearing base (111) through which the bolt (10) is configured to rest against a structure (22) of the horological movement (20).