Anti-Torque Safety Hook Structure to Prevent Fall-Arrest Decoupling
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Solution Overview
Problem
Current safety hooks used in personal fall arrest systems fail to withstand the torque generated from side impacts during falls, which can lead to decoupling from the anchor point, not meeting the ANSI/ASSP Z359.12-2019 standard.
Innovation Solution
An anti-torque safety hook design featuring a main body with a hook opening, a passage, a female buckle, a connection unit, and an energy absorption area, where the gate member and detent member work together to ensure the passage remains closed even under torque, utilizing a spring and energy absorption area to prevent decoupling by allowing the main body to distort and absorb the torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the safety hook uses a traditional rigid structure, then the manufacturing is simple and cost-effective, but the hook cannot withstand torque from side impacts during falls
Solution Approach 1:
The safety hook is divided into distinct functional segments: a rigid main body for structural integrity, a flexible gate member for opening/closing operations, and a detent member for locking. This segmentation allows each component to be optimized for its specific function while collectively providing torque resistance through the integrated energy absorption area.
Solution Approach 2:
The gate member is designed as a dynamic component that can flex and deform under torque loads. The energy absorption area is specifically configured to allow controlled deformation of the gate member when subjected to side impacts, enabling the structure to absorb torque dynamically rather than relying solely on rigid resistance.
2Strength
If the safety hook is designed to absorb torque through deformation, then the torque resistance is improved, but the manufacturing precision and quality control become more difficult
Solution Approach 1:
The energy absorption area is localized to specific regions of the main body and gate member where controlled deformation is desired. By concentrating the deformation capability in these localized areas rather than distributing it throughout the entire structure, the manufacturing precision requirements are focused on specific critical zones, making quality control more manageable.
Solution Approach 2:
The design incorporates specific geometric parameters and material properties in the energy absorption area that are optimized to achieve the desired torque resistance. By carefully controlling parameters such as thickness, curvature, and material composition in the deformation zones, the patent achieves predictable and controllable deformation behavior under torque loads.
3Reliability
If the gate member is designed to remain closed under torque, then the reliability is improved, but the ease of operation for opening and closing becomes more difficult
Solution Approach 1:
The detent member acts as a counterbalancing mechanism that provides a mechanical advantage for closing the gate member. When the operator closes the gate, the detent member engages with the gate member to provide a locking force that secures the passage closure, effectively counteracting the forces that might otherwise cause the gate to remain partially open or fail to latch properly under torque loads.
Solution Approach 2:
The detent member is designed to automatically engage with the gate member when the gate is closed, providing self-locking functionality. This self-service mechanism ensures that the passage remains reliably closed without requiring additional operational steps from the user, while still allowing easy opening when the detent member is deliberately actuated.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The safety hook effectively prevents decoupling from the anchor point by absorbing torque, ensuring the user remains securely attached during falls, thus meeting the ANSI/ASSP Z359.12-2019 standard by maintaining the passage closure and preventing the hook from disengaging.
Implementation Method 1
the energy absorption area allows the main body to distort in response, so as to ensure that the gate member still close the passage
Data Source
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AI summary
An anti-torque safety hook includes a main body (10), a gate member (20), and a detent member (30). The main body (10) has a hook opening (15) passing through the front and back sides thereof, a passage (16) communicating to the right side of the hook opening (15), a female buckle (17) arranged on the passage (16), a connection unit (13) arranged below the hook opening (15), and an energy absorption area (E) arranged on the left side of the hook opening (15). The gate member (20) has a first end mounted on the main body (10) and a second end comprising a male buckle (25), adapted for detachably coupled with the female buckle (17), so as to allow the gate member (20) to open and close the passage (16). The detent member (30) is coupled on the main body (10) and maintained at a first position, so as for ensuring that the gate member (20) closes the passage (16), while when the detent member (30) is operated and switched to a second position, the safety is disarmed. The present invention mainly utilizes the detent member (30) to ensure the gate member (20) to close the passage (16). When the main body (10) bears the designated torque, the energy absorption area (E) allows the main body (10) to distort in response while the gate member (20) may still close the passage (16), so as to prevent the risk of decoupling and in order to meet the standard of ANSI/ASSP Z359.12-2019.