Shackle Guard with Tether Prevents Pin Unscrewing
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Solution Overview
Problem
D-rings with shackles often detach during lifting operations due to unscrewing pins, leading to accidental drops of loads.
Innovation Solution
A shackle guard with an open channel to receive the shackle and a tether with a fastener that secures to the closure pin, preventing accidental loosening by resisting rotation and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shackle with through holes and screw/bolt connection is used to attach lifting machines, then the lifting operation can be performed, but the pin may unscrew during movement causing detachment and load drop
Solution Approach 1:
The guard is designed to receive and nest the shackle within its open channel, creating a protective enclosure. The tether with fastener nests around the closure pin, providing an additional securing layer. This nested structure prevents pin unscrewing while maintaining compactness.
Solution Approach 2:
The guard acts as an intermediary component between the shackle and the external environment, protecting the pin from vibration and rotation. The tether with fastener serves as an intermediary securing mechanism that directly engages the pin to prevent unscrewing during lifting operations.
2Device complexity
If a simple D-ring with pin connection is used, then the device complexity is low, but the pin may unscrew due to vibration and rotation during lifting
Solution Approach 1:
The guard and tether assembly provides preliminary protection against pin unscrewing before it can occur during lifting operations. The fastener预先 engages the pin and the guard encloses the shackle, creating preventive measures against vibration and rotation-induced loosening.
Solution Approach 2:
The guard is pre-positioned to receive the shackle and the tether is pre-configured with the fastener to engage the pin before lifting begins. This preliminary arrangement ensures that the pin is secured against unscrewing forces from the outset of the lifting operation.
Data Source
AI summary
A guard defines an inner seat comprising an open channel shaped to receive a shackle and extend partially around the shackle. The guard further includes an outer seat positioned opposite the open channel and shaped to support a strap passing through the shackle. A tether is fastened to the guard and defines a fastener for securing to a closure pin passing through the shackle. In some embodiments, the fastener comprises a hole formed in the tether and a barb formed on the tether offset from the hole. In some embodiments, the fastener comprises a hole formed in the tether and offset from a distal end of the tether and a barb at the distal end of the tether for insertion within the hole.