Truss Section Joint Using a Single Multi-Diameter Locking Pin
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Solution Overview
Problem
Existing chain motor distribution systems are bulky, heavy, and inefficient, requiring specialist cables and distribution units, and lack safety and efficiency features, making them difficult to ship and handle, and posing safety hazards due to lack of phase reversal and remote power switching capabilities.
Innovation Solution
The solution involves relocating power switching and phase reversal after branch circuit protection, reducing the current rating and size of the distribution unit, and using industry-standard 'Soco' multi-cable for power distribution, which allows for a smaller, lighter, and more cost-effective distro that can be pre-installed in trusses, with integrated safety features such as power monitoring and remote control capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power switching and phase reversal are performed before branch circuit protection using large contactors, then remote control capability is achieved, but the distribution unit becomes bulky and heavy
Solution Approach 1:
The patent segments the power control function by separating the high-current power switching from the low-current control signaling. Small relays handle the control signaling after branch circuit protection, while the power switching is distributed to individual motor circuits. This segmentation allows the main distribution unit to be compact while maintaining remote control capability through low-current signaling.
Solution Approach 2:
The patent introduces an intermediary control system using low-current signaling and small relays that mediate between the remote control interface and the high-current motor circuits. This intermediary layer enables remote operation without requiring large contactors in the main distribution unit, as the actual power switching occurs at the individual motor level.
2Reliability
If specialist cables and distribution units are used for three-phase 30-60 A supply, then chain motor operation is enabled, but inventory complexity and distribution difficulty increase
Solution Approach 1:
The patent makes the distribution unit universal by accepting both three-phase 30-60 A supply and single-phase 120 V supply through the same interface. The system can derive three-phase power from single-phase input using phase converters, allowing the same distribution unit to work with different power sources and cable types, thereby simplifying inventory requirements.
Solution Approach 2:
The patent enables parameter changes in the power supply configuration, allowing the system to adapt between different voltage phases and current ratings. The distribution unit can convert single-phase input to three-phase output, and adjust current ratings based on the connected motors, providing flexibility without requiring specialized equipment for each configuration.
3Ease of operation
If phase reversal is performed at the main power input, then motor direction control is achieved, but the distribution unit size increases due to large contactors
Solution Approach 1:
The patent segments the phase reversal function from the main distribution unit and places it at the individual motor level. Small relays at each motor circuit handle phase reversal locally, allowing the main distribution unit to remain compact while maintaining full motor direction control capability through the segmented control architecture.
Data Source
AI summary
An endwise joining of truss sections is disclosed. A section end is provided with at least two fittings, connecting with suitable fittings on another truss section end, locked together by inserting a pin through suitable openings in both fittings. Savings in time and labor are achieved by using the same pin for both fittings, the diameter of the openings in the fittings differing.