Lifting Hook Safety Latch Locking Mechanism
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Solution Overview
Problem
Existing safety latches for lifting hooks require significant manual effort to open and maintain open, posing safety risks and inefficiencies, especially when handling large loads, as they often necessitate using one hand to keep the latch open, which can lead to accidents or the need for additional personnel.
Innovation Solution
A locking and releasing device with a locking element on the back surface of the safety latch and a releasing lever that allows the safety latch to be easily locked and unlocked, enabling hands-free operation and reducing the force required to maintain the latch in the open position, featuring a locking magnet or alternative locking mechanisms that can be retrofitted to existing hooks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the safety latch is pressed open manually against spring force, then the latch can be opened to release the load, but significant manual force is required and one hand must be kept occupied holding it open
Solution Approach 1:
The locking element automatically engages with the hook body surface when the safety latch is in the open position, locking itself without requiring continuous manual force. The releasing lever provides a mechanical advantage system where a small rotational force applied by the user automatically overcomes the spring force and releases the locking element, allowing the latch to close without sustained manual effort.
Solution Approach 2:
The locking element acts as an intermediary mechanism between the safety latch and the hook body. It transfers and amplifies the user's small rotational force applied to the releasing lever into sufficient force to overcome the spring and close the latch, while also providing a mechanical advantage that reduces the force needed compared to directly pressing the latch against the spring.
2Productivity
If the safety latch is kept open with one hand, then the load can be accessed, but the other hand cannot be used for releasing the load and safety risks increase
Solution Approach 1:
The locking element automatically maintains the latch in the open position once positioned, eliminating the need for continuous manual holding. This allows both hands to be free for safe and efficient load handling while maintaining the latch securely open throughout the operation.
Solution Approach 2:
The manual holding action is replaced by a mechanical locking system where the locking element engages with the hook body surface. This substitution eliminates the need for continuous manual intervention, allowing operators to use both hands for load operations while the mechanical system maintains the latch position reliably.
3Ease of operation
If a locking element engages the hook body surface, then the safety latch can be locked in the open position, but the device complexity increases
Solution Approach 1:
The locking and releasing function is segmented into distinct components: the locking element that engages with the hook body, the releasing lever that provides the release mechanism, and the spring that provides the closing force. This segmentation allows each component to perform its specific function simply and reliably, reducing overall complexity while enabling hands-free operation.
Solution Approach 2:
Instead of requiring continuous manual force to maintain the open position against the spring, the system inverts the approach by using the locking element to actively secure the open position. The default state becomes locked-open rather than spring-closed, and release is achieved through a simple lever action that reverses the locking engagement.
4Adaptability or versatility
If the safety latch is left open after load fastening, then access is maintained, but the safety latch becomes useless and hooks may rotate
Solution Approach 1:
The locking element automatically engages to maintain the open position when needed, and the same locking mechanism automatically releases when the releasing lever is actuated. This self-service capability ensures the latch remains secure in whatever position it is set, preventing unintended movement or rotation while maintaining operational flexibility.
Solution Approach 2:
The locking element provides mechanical feedback by engaging with the hook body surface, creating a stable locked state that prevents accidental movement. The system responds to the user's positioning action by automatically securing the latch in place, providing feedback that the latch is securely held in the desired position without requiring continuous attention.
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 enhances safety and efficiency by allowing hands-free operation of the safety latch, reducing the risk of accidents and the need for additional personnel, while being easy to use and cost-effective, with a design that ensures the latch returns to a safe closed position if damaged.
Implementation Method 1
a locking element arranged on the back surface of the safety latch, which element in its locking position against the surface of the hook body engages the inner surface area of the hook jaw
Implementation Method 2
a spring arranged between the safety latch and the hook body and forcing the latch end into the closed position
Implementation Method 3
the locking element may preferably comprise a locking magnet with a locking surface that in its locking position engages the surface of the hook body and locks the safety latch into its open position
Data Source
Figure 1~3
Figure 4~5
Figure 6~8
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 pivotably 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 between the safety latch and hook body forces the latch end into the closed position. The locking and releasing device (10) of the safety latch comprises a locking element (11) arranged on the back surface of the safety latch (6), which element in its locking position against the surface of the hook body engages the inner surface area of the hook jaw (G) at a distance below the fastening end (7) of the safety latch, and a releasing lever (12) that extends to the front side of the safety latch and, when turned, releases the locking element and, thus, allows the safety latch (6) to turn into its closed position.