Swivel Knuckle Design Prevents Wire Twisting in Adjustable Light Fixtures
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Solution Overview
Problem
Conventional outdoor lighting systems that allow adjustable light fixtures often lead to wiring issues such as twisting, disengagement, and fraying due to unrestricted rotational adjustment.
Innovation Solution
A light fixture design featuring a spherical joint and sealing grommet that enables relative longitudinal motion while preventing rotational motion, thereby maintaining wire integrity and preventing water and foreign matter ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If unrestricted rotational adjustment is allowed in adjustable light fixtures, then ease of operation is improved, but wire integrity deteriorates due to twisting and fraying
Solution Approach 1:
The rotational movement is segmented into discrete positions (e.g., 0°, 45°, 90°, 135°) rather than allowing continuous rotation. The channel in the spherical joint is designed to guide the toothed anchor portion to specific angular positions, preventing excessive wire twisting while maintaining adjustability.
Solution Approach 2:
A channel acts as an intermediary between the anchor portion and the spherical joint, constraining the rotational movement. The channel guides the toothed anchor portion along a predefined path, allowing controlled adjustment while preventing unrestricted rotation that would damage the wiring.
2Reliability
If rotational motion is prevented in the support arm, then wire integrity is improved, but ease of operation deteriorates due to reduced adjustability
Solution Approach 1:
The system transitions from a static fixed position to a dynamic adjustable position system. The spherical joint with channel and toothed anchor allows the light fixture to be adjusted to different angular positions while maintaining stability at each position, combining adjustability with wire protection.
Solution Approach 2:
The rotational parameter is changed from continuous to discrete values. The channel geometry defines specific angular positions where the toothed anchor can rest, transforming the continuous rotation parameter into discrete adjustable positions that protect the wiring.
3Object-affected harmful factors
If a sealing grommet is added to prevent water ingress, then protection against harmful factors is improved, but device complexity increases
Solution Approach 1:
The sealing grommet is merged with the existing support arm structure. The grommet is integrated into the support arm to provide sealing without requiring separate mounting brackets or additional fastening mechanisms, thus adding protection while minimizing complexity increase.
Data Source
AI summary
A light fixture comprising, a housing having a base, a support arm, an opening opposite the base with a lens disposed in the opening, and a light source disposed within the housing; and an anchor portion having a fastening end and a cylindrical projection with a tooth on a surface of the cylindrical projection, and a central axis extending through the anchor portion into the support arm; and a spherical joint comprising an inner channel extending less than 360 degrees around the inner surface of the spherical joint; and a sealing grommet. The light fixture is configured to enable relative longitudinal motion between the spherical joint and the support arm and configured to prevent rotational motion therebetween.