Actuating Knob Spring Alignment for Consistent Cover Gaps
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Solution Overview
Problem
Assembly inaccuracies due to manufacturing-related tolerances lead to an inclined position of the actuation axis in electrical installation devices, resulting in an uneven gap between the central button and the cover element, affecting the visual appearance and functionality.
Innovation Solution
A spring element is used to exert a compressive force on the central button, correcting the inclination of the actuation axis and ensuring parallel positioning with the cover element, thereby maintaining a consistent gap width and compensating for manufacturing tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If guide elements with radial play are used for the actuating shaft, then the actuating shaft can rotate and slide freely, but the actuating axis becomes misaligned and the gap width becomes inconsistent
Solution Approach 1:
The spring element changes the force parameter acting on the central button, applying a compensating force that adjusts the position of the actuating shaft to maintain consistent gap width while preserving rotational freedom
Solution Approach 2:
The spring element acts as an intermediary between the central button and the guide elements, mediating the position adjustments needed to compensate for radial play and maintain alignment
2Device complexity
If standard guide components are used without modification, then the device structure remains simple, but the actuating axis inclination cannot be corrected
Solution Approach 1:
The spring element is introduced as a simple intermediary component that corrects actuating axis inclination without requiring modification of the existing guide components, maintaining structural simplicity while improving alignment precision
3Manufacturing precision
If the central button is rigidly fixed to the actuating shaft, then positioning is precise, but assembly inaccuracies cannot be compensated
Solution Approach 1:
The spring element introduces a dynamic, elastic connection between the central button and actuating shaft, allowing the system to adapt to assembly inaccuracies and compensate for tolerances while maintaining precise positioning through the spring force
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 spring element effectively balances tolerance chains, ensures parallel alignment of the central button with the cover element, and allows for variable positioning, enhancing the visual appeal and operational reliability of the device.
Implementation Method 1
A spring element is used to exert a compressive force on the central button, correcting the inclination of the actuation axis and ensuring parallel positioning with the cover element
Data Source
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AI summary
The present invention relates to an electrical installation device comprising a housing (1) for receiving an electrical circuit board (4) with an upper housing wall (3) and a cover element (5) extending over its upper surface, the cover element having a base surface (7) and an annular collar (8) formed on its circumference, wherein an actuating shaft (12) extends through the upper housing wall (3) and the base surface (7) in a direction perpendicular to both. The actuating shaft (12) is guided by means of a guide bushing (13) arranged on the upper housing wall (3), wherein a central knob (18) is attached to the upper end of the actuating shaft (12), the central knob having a circumferential wall (20) on its circular edge, directed towards the base surface (7) and terminating within the annular collar (8).Between the cover element (5) and the central knob (18) an annular spring element (22) is arranged concentrically to the central axis (XX) of the guide bushing (13) and is designed such that the central knob (18) is subjected to an axially directed compressive force circumferentially when fully inserted.