Rotatable Latch Mechanism for Boom Gates with Staged Failure
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Solution Overview
Problem
Existing latch mechanisms for boom gates lack a reliable and resilient solution to securely hold the gate in a closed position, especially under high vertical loads and potential collisions from vehicles, and do not provide a staged failure mechanism.
Innovation Solution
A rotatable latch mechanism with multiple retention members and key apertures that allow for staged failure, featuring a latch portion that engages with retention members to prevent withdrawal and includes a lock portion for additional security, enabling reliable closure and resistance to high loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single retention member is used, then the device complexity is reduced, but the reliability and ability to withstand high vertical loads deteriorates
Solution Approach 1:
The latch mechanism is divided into multiple retention members (first retention member with first key aperture, second retention member with second key aperture) spaced along the main support. This segmentation allows the system to distribute loads across multiple engagement points, enhancing reliability while maintaining manageable complexity through modular design.
2Reliability
If the latch mechanism is designed to be highly secure, then the reliability improves, but the ease of operation deteriorates
Solution Approach 1:
The rotatable latch provides dynamic operation, allowing the gate to be easily opened and closed by simple rotation. The latch portion can rotate between a receiving position (for easy operation) and a latched position (for secure engagement), balancing ease of operation with reliability.
3Reliability
If multiple retention members are used, then the reliability and staged failure capability improve, but the device complexity increases
Solution Approach 1:
The use of multiple retention members spaced along the main support creates a segmented structure that enables staged failure. If one retention member fails, the others can continue to provide support, maintaining reliability while the modular segmented design keeps complexity manageable.
4Strength
If the latch mechanism is designed to withstand high vertical loads, then the strength improves, but the ease of manufacture deteriorates
Solution Approach 1:
The main support is segmented with multiple retention members spaced along its length, allowing the structure to distribute and withstand high vertical loads through multiple engagement points. This segmented approach maintains strength while keeping individual components manufacturable.
Data Source
AI summary
A latch mechanism for a gate has a main support, first and second retention members, and a rotatable latch. The retention members each have a respective key aperture and the respective first and second apertures are spaced along the main support and separated by a gap. The rotatable latch includes a latch portion, one or more key portions which extend through either or both of the first key aperture and second key aperture, and is rotatable about an axis of rotation between a receiving position in which the gate is moveable between an open position and a closed position, or vice versa, and a latched position in which the gate is restrained in the closed position by the latch portion and where the one or more key portions engage with either or both of the first and second retention members to prevent withdrawal of the rotatable latch.