Lifting Hook Safety Latch Lever Mechanism
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Solution Overview
Problem
Existing lifting hooks require significant manual effort and risk to keep the safety latch open during load release, limiting user safety and efficiency, as they often necessitate using one hand to maintain the latch open, and there's a risk of injury from the latch mechanism.
Innovation Solution
A locking and releasing lever is integrated into the safety latch, allowing it to be kept open by resting on the hook tip, enabling easy operation with both hands and automatic return to the closed position if damaged, thus enhancing safety and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the safety latch is kept open manually during load release, then the load can be released, but the user must use one hand to maintain the latch open, preventing use of both hands and creating safety risks
Solution Approach 1:
The safety latch system performs the function of keeping the latch open automatically without requiring continuous manual intervention. The lever mechanism maintains the latch in the open position by itself once activated, allowing the user to release the load with both hands while the system serves itself to hold the latch open.
2Reliability
If a powerful spring is used in the safety latch to ensure reliable closing, then the latch returns to closed position reliably, but the user may still hurt hands if they get caught between the latch and hook body
Solution Approach 1:
The lever acts as an intermediary element between the user's hand and the safety latch mechanism. By operating the lever instead of directly manipulating the latch, the user's hand is kept away from the dangerous closing path between the latch and hook body, while the lever transmits the force to open the latch safely.
3Ease of operation
If the safety latch is left open after load fastening, then handling is easier, but the safety latch becomes useless and the hook may rotate during handling
Solution Approach 1:
The safety latch system transitions from a static fixed position to a dynamic controllable state. The lever mechanism allows the latch to be easily moved between open and closed positions as needed during different phases of operation, providing adaptability rather than a fixed state, thus maintaining safety functionality while enabling convenient handling when required.
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 solution provides a safer and more efficient operation of the safety latch, reducing the risk of injury and the need for additional personnel, while maintaining low manufacturing costs and clear operation visibility.
Implementation Method 1
a spring arranged between the safety latch and the hook body and forcing the latch end into the closed position
Implementation Method 2
a locking and releasing lever that is arranged to turn freely between a turning axle of the safety latch and latch end in the front area of the safety latch and that in its locking position rests against the hook tip and keeps the safety latch in its open position
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a lifting hook, its safety latch and a locking and releasing device of the safety latch. The lifting hook (1) comprises a hook body (2) having a hook stem (4)and tip (5).The safety latch (6) has a fastening end (7) and a free latch end (8), the fastening end of the safety latch being pivotally fastened close to the stem so as to move the safety latch between an open position and a closed position, the safety latch being in its open position substantially against the inside of the hook body in a position that leaves a hook jaw (G) free,while in the closed position the latch end extends across the hook jaw to the hook tip, closing the jaw on the inside thereof.A spring arranged be- tween the safety latch and hook body forces the latch end into the closed position. The locking and releasing device comprises a locking and releasing lever (10) that is arranged to turn freely between a turning axle of the safety latch (6) and latch end (8) in the front area of the safety latch and that in its locking position rests against the hook tip (5) and keeps the safety latch in its open position against the inner side of the hook body (2).