Four-Way Switch Malfunction Prevention via Guide Grooves
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Solution Overview
Problem
Conventional four-way switches often malfunction by operating two switches simultaneously when the edge portion of the knob is pushed, leading to inaccurate operations in four directions.
Innovation Solution
A four-way switch design featuring a stopper with a predetermined height and a recess portion on the knob, along with guide protrusions and guide grooves, limits the downward motion of the knob to prevent simultaneous operation of switches by interfering with the tilt motion in incorrect directions, ensuring accurate operation in four directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protrusion (stopper) is formed on the housing to prevent simultaneous operation, then the reliability of switch operation is improved, but when the stopper height is low, the knob can still be pushed down to on-stroke causing two switches to operate simultaneously
Solution Approach 1:
The invention transitions from a single-dimension stopper height adjustment to a multi-dimensional solution by adding guide protrusions and guide grooves that constrain knob motion in horizontal directions, complementing the vertical stopper function to achieve comprehensive motion control
Solution Approach 2:
The guide protrusions and guide grooves act as intermediary elements between the knob and the switching mechanism, mediating the knob's motion to ensure it follows the correct path and only activates the intended switch
2Reliability
If the stopper height is increased to prevent edge pushing, then simultaneous operation is prevented, but the downward motion of the knob is excessively limited affecting normal switching operation
Solution Approach 1:
The invention segments the motion control function into multiple independent components: the stopper controls vertical motion to prevent simultaneous operation, while guide protrusions and guide grooves control horizontal motion to enable accurate four-direction switching, allowing each component to optimize its specific function without interfering with others
3Ease of operation
If the knob is allowed free motion for accurate four-direction switching, then ease of operation is improved, but the edge portion can be pushed causing two switches to operate simultaneously
Solution Approach 1:
The invention applies local quality by providing different motion constraints at different locations and directions: the stopper provides constraint in the vertical direction at the edge portions to prevent simultaneous operation, while guide grooves provide guidance in horizontal directions to enable accurate four-direction switching, allowing free motion only where desired
Data Source
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AI summary
A four-way switch including a malfunction prevention structure is disclosed. The four-way switch according to an embodiment of the present invention includes a knob configured to be tilted in four directions to perform a switching operation in the four directions. A summary of the configuration of the four-way switch is that the four-way switch includes a housing to which the knob is attached in a tiltable manner; a stopper formed on a surface of the housing so as to protrude by a predetermined height, the stopper being configured to limit a downward motion of the knob by contacting a portion of a lower surface of the knob while the knob is tilted; a guide protrusion formed on the lower surface of the knob so as to protrude by a predetermined length; and a guide groove portion formed on the surface of the housing so as to protrude by a predetermined height so as to face the guide protrusion, the guide groove portion including a recess portion having a structure that engages with the guide protrusion.