Lighting Fixture Swivel Joint with Automatic Electrical Disconnect
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Solution Overview
Problem
Industrial lighting fixtures in elevated locations pose safety hazards for maintenance workers due to the need for ladder access, require multiple tools for servicing, and risk electrical arcs during repairs, especially in hazardous environments.
Innovation Solution
A lighting fixture design featuring a unique swivel joint that allows safe access without ladders, a locking/switching mechanism for automatic power disconnection during servicing, and a tool-free mounting system to minimize hardware loss and ensure safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a ladder is used to access the lighting fixture head, then the maintenance worker can reach the fixture, but the worker faces safety hazards from climbing a ladder supported on a catwalk high above the ground
Solution Approach 1:
The patent applies the dynamics principle by making the pole movable rather than fixed. The pole can be lowered from its elevated position to ground level, allowing maintenance workers to access the fixture head safely without climbing ladders. This dynamic adjustment of the pole position directly resolves the safety hazard while maintaining accessibility.
2Ease of operation
If a pivot joint is used to lower the pole, then the fixture head becomes accessible, but the fixture head is pivoted laterally beyond the catwalk requiring the worker to reach over the rail
Solution Approach 1:
The patent applies asymmetry by designing the pivot joint with a specific geometric configuration that prevents lateral movement beyond the catwalk. The asymmetric design of the pivot mechanism ensures the fixture head remains positioned over the catwalk during lowering, eliminating the need for workers to reach over dangerous rails while still providing accessible maintenance.
3Strength
If conventional mounting hardware is used, then the fixture head can be attached to the pole, but multiple tools are required and hardware may be lost
Solution Approach 1:
The patent applies self-service through the tool-free mounting mechanism where the pole itself serves as the fastening tool. The pole is designed with integrated features that allow it to mechanically engage and secure the fixture head without requiring external tools like wrenches or screwdrivers. This eliminates tool requirements and the risk of hardware loss while maintaining a secure mounting connection.
4Reliability
If power is terminated at the source before servicing, then electrical safety is improved, but large areas of the facility become unilluminated
Solution Approach 1:
The patent applies segmentation by dividing the electrical power system into individual controllable units at each fixture location. Each fixture has its own disconnect mechanism that can be independently activated, allowing power to be cut only at the specific fixture being serviced while other fixtures remain illuminated. This segmented approach maintains both electrical safety and overall facility productivity.
5Reliability
If on/off switches are provided at each fixture, then individual power control is achieved, but the cost of the fixture and installation increases
Solution Approach 1:
The patent merges the electrical disconnect function with the mechanical mounting structure. The disconnect mechanism is integrated into the pole and fixture head assembly, combining two functions (mechanical attachment and electrical disconnection) into a single unified system. This integration eliminates the need for separate expensive switches while maintaining individual power control capability.
6Strength
If the locking pin aperture is accessible, then the locking pin can be inserted to secure the fixture, but electrical arcs may occur during plug disconnection
Solution Approach 1:
The patent applies preliminary action by designing the mechanism so that the electrical disconnect occurs automatically and simultaneously with the mechanical locking action. The locking pin insertion triggers the plug disconnection before the worker handles any electrical components, preventing electrical arcs. This preliminary automatic disconnection eliminates the harmful electrical arc hazard while maintaining secure mechanical locking.
Data Source
AI summary
A lighting fixture stanchion arm generally includes a housing, a guard lever supported in the housing, a switch mechanism supported in the housing and a locking pin. The housing has an entry for receiving a radial finger of a fixture head and an aperture for receiving the locking pin. The guard lever is movable from a home position to an away position by the radial finger of the fixture head upon rotation of the fixture head with respect to the housing, wherein the guard lever blocks the locking pin aperture of the housing when in the home position. The locking pin is insertable in the locking pin aperture of the housing for actuating the switch mechanism when the lever guard is moved to the away position by the radial finger of the fixture head.