Safety Load Hook Locking Lever Center of Mass
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Solution Overview
Problem
Safety load hooks can experience unintended unlocking due to excessive force application or dynamic impacts, leading to potential shearing of the locking bolt or overcoming of the pretensioning spring, resulting in a loss of secure connection between the load hook and its load.
Innovation Solution
A safety load hook design featuring a locking lever with a receiving bore and support bolt, where the center of mass lies on the lateral surface or inside the cross-sectional surface of the bore, preventing unwanted release by minimizing opening torque from inertia and supporting the lever against the lower part to prevent shearing, and incorporating a recess for the tensioning spring for secure assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional locking arrangement with a locking lever and pretensioning spring is used, then the load hook can be locked in the closed position, but the locking action can be cancelled under dynamic impact or excessive force due to inertia of the locking lever overcoming the spring force
Solution Approach 1:
The locking lever is designed with an offset center of mass positioned away from the support bolt axis, creating a counterbalancing moment that opposes the inertial moment during dynamic impact. This counterweight effect ensures that the pretensioning spring force is not overcome during sudden downward impacts, maintaining reliable locking action under dynamic conditions.
Solution Approach 2:
The locking lever is pre-designed with a specific center of mass position that creates a preliminary counter-moment against potential inertial forces. This preliminary anti-action is built into the geometry of the locking lever itself, preparing the system to resist dynamic impacts before they occur, rather than relying solely on the pretensioning spring to counteract inertial forces during the impact event.
2Device complexity
If the locking lever is designed with conventional geometry, then the structure is simple, but the support bolt can shear off under excessive force due to lever action
Solution Approach 1:
By positioning the center of mass of the locking lever offset from the support bolt axis, the design creates a counterbalancing moment that reduces the net force transmitted to the support bolt during dynamic events. This counterweight effect protects the support bolt from shearing by抵消ing part of the lever action force through the inertial moment of the offset center of mass.
3Reliability
If the center of mass of the locking lever is positioned away from the support bolt axis, then dynamic impact resistance is improved, but the locking lever geometry becomes more complex
Solution Approach 1:
The locking lever incorporates an offset center of mass as an integrated geometric feature rather than a separate component. This design approach achieves the counterweight effect while maintaining a relatively simple monolithic lever structure, avoiding the need for additional balancing weights or complex articulated mechanisms.
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 design effectively prevents unintended unlocking during dynamic impacts and excessive force application, ensuring a secure connection without the need for a remote-controlled locking system, while simplifying assembly and reducing the risk of support bolt shearing.
Implementation Method 1
a tensioning spring (10), by means of which the locking lever (7) is pre-tensionable into the locked position
Implementation Method 2
the center of mass of the locking lever (7) lies on the lateral surface (M) of the receiving bore (8) for the support bolt (9) or inside the cross sectional surface surrounded by the same
Data Source
AI summary
A safety load hook with a lower part having a hook throat to which a pivotable upper part is fastened, which, in an open position, allows a load to be suspended on the hook throat and, in a closed position, blocks the hook throat. The upper part is blockable in the closed position by a locking arrangement which includes a locking lever that is pivotable into a release position and a locked position, is pre-tensionable into the locked position by a tensioning spring, is fastened to the lower part with the tensioning spring via the support bolt and, in the locked position, engages in a receiver on the upper part by way of a shaped projection. The locking lever includes a lever on its side opposite the shaped projection, with a center of mass on the lateral surface of the receiving bore for the support bolt.