Anti-Torque Safety Hook With Energy-Absorbing Main Body
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Solution Overview
Problem
Current safety hooks used in personal fall arrest systems fail to withstand both downward pulling forces and torque from side impacts, as per the ANSI/ASSP Z359.12-2019 standard, leading to potential unhooking or breaking during falls.
Innovation Solution
An anti-torque safety hook design featuring a main body with a hook opening, energy absorption area, and a gate member, where the energy absorption area allows the main body to distort under torque, ensuring the gate member maintains closure of the hook opening, and a detent member allows controlled opening to prevent decoupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the safety hook uses a rigid structure to resist downward pulling force, then the strength is improved, but the hook becomes vulnerable to torque from side impact causing unhooking or breaking
Solution Approach 1:
The safety hook incorporates a movable gate member that can dynamically respond to applied loads. The gate member is designed to move along the main body in response to torque, allowing the structure to adapt to side impact forces rather than rigidly resisting them, thereby preventing unhooking while maintaining strength against downward forces
Solution Approach 2:
The patent changes the structural parameters of the main body by incorporating an energy absorption area with specific geometric features. This area is designed to deform in a controlled manner under torque, changing the mechanical properties of the hook from rigid to semi-flexible, allowing it to absorb torque energy while maintaining connection integrity
2Reliability
If the safety hook uses a fixed gate structure to prevent unhooking, then the reliability is improved, but the device complexity increases due to additional anti-torque mechanisms
Solution Approach 1:
The patent merges the anti-torque function into the existing gate member structure. The gate member itself serves dual purposes: as the closure element for the hook opening and as the component that responds to torque through its movement along the main body. This integration eliminates the need for separate anti-torque mechanisms, maintaining reliability while minimizing added complexity
Solution Approach 2:
The gate member is designed to automatically respond to torque forces through its own movement capabilities. When torque is applied, the gate member naturally moves along the main body in a controlled manner, self-regulating the torque response without requiring external control mechanisms or additional components
3Stability of the object's composition
If the main body is designed to be rigid to maintain connection stability, then the stability is improved, but the hook cannot absorb torque energy causing potential breaking
Solution Approach 1:
The patent incorporates an energy absorption area with predetermined deformation characteristics into the main body structure. This area is designed in advance to absorb torque energy through controlled deformation, cushioning the main body against torque-induced breaking while maintaining connection stability through the gate member's constrained movement
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 anti-torque safety hook effectively absorbs predetermined torque, preventing the main body from breaking and ensuring the gate member keeps the passage closed, thus meeting the ANSI/ASSP Z359.12-2019 standards by allowing the main body to distort and maintain the anchor point connection during falls.
Implementation Method 1
when the main body bears a designated torque, 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
AI summary
An anti-torque safety hook includes a main body, a gate member, and a detent member. The main body has a hook opening passing through the front and back sides thereof, a passage communicating to the right side of the hook opening, a female buckle arranged on the passage, a connection unit arranged below the hook opening, and an energy absorption area arranged on the left side of the hook opening. The gate member has a first end mounted on the main body and a second end comprising a male buckle, adapted for detachably coupled with the female buckle, so as to allow the gate member to open and close the passage. The detent member is coupled on the main body and maintained at a first position, so as for ensuring that the gate member closes the passage, while when the detent member is operated and switched to a second position, the safety is disarmed. The present invention mainly utilizes the detent member to ensure the gate member to close the passage. When the main body bears the designated torque, the energy absorption area allows the main body to distort in response while the gate member may still close the passage, so as to prevent the risk of decoupling and in order to meet the standard of ANSI/ASSP Z359.12-2019.