Nested Rotary Switch Potentiometer for Compact Instrument Panels
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Solution Overview
Problem
In vehicles, particularly on the instrument panel, the limited structural space poses a challenge for integrating adjacent operating elements for functions like headlight adjustment and light function selection, as existing designs often require excessive space for switches and potentiometers.
Innovation Solution
A rotary switch design featuring a central handle, a ring-shaped shield, a rotatable button offset from the central axis, and a radially offset potentiometer coupled via a gear, which reduces the overall space requirement by allowing the potentiometer's radial extent to be minimized and utilizing available space more efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rotary switch with an additional rotary button for headlight range adjustment is integrated into the instrument panel, then the functionality is improved, but the available installation space is insufficient
Solution Approach 1:
The potentiometer is positioned radially inside the rotary button, with its axis offset from the button's axis. The gear mechanism transmits rotation from the rotary button to the potentiometer, allowing the potentiometer to be nested within the radial space of the rotary button rather than requiring additional radial space
Solution Approach 2:
The patent transitions from a conventional layout where the potentiometer would be positioned radially outside the rotary button to a nested configuration where the potentiometer is positioned radially inside. This dimensional reorganization allows both components to share the same radial space envelope, reducing the overall area requirement
2Device complexity
If the potentiometer is positioned radially outside the rotary button, then the coupling is simplified, but the radial space requirement increases
Solution Approach 1:
The potentiometer is positioned radially inside the rotary button with an offset axis. The gear mechanism bridges the radial distance between the rotary button and the potentiometer, transmitting rotation efficiently while allowing both components to share the same radial space envelope
Solution Approach 2:
The gear acts as an intermediary mechanism that transmits rotation from the rotary button to the potentiometer positioned at a radial offset. This intermediary allows the potentiometer to be positioned inside the rotary button's radial envelope while maintaining functional coupling
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
This design effectively reduces the total space needed for the rotary switch, enabling better utilization of limited installation space while maintaining functionality for headlight adjustment and light function selection, even in compact vehicle environments.
Implementation Method 1
The potentiometer is arranged radially spaced from the offset axis and is coupled with the rotary button by means of a gear
Data Source
AI summary
A rotary switch is disclosed which has a central handle (12) which is rotatable about a central axis (Z), a ring-shaped shield (16) surrounding the handle (12), a rotary button (18) which is arranged on the shield (16) and is rotatable about an axis (V) offset from and parallel to said central axis (Z), and a potentiometer (28) which is adjustable by means of the rotary button (18).The potentiometer (28) is radially spaced from the offset axis (V), and is coupled with the rotary button (18) by means of a gear (24, 26). The potentiometer (28) is offset radially inwards from the offset axis (V) towards the central axis (Z).