Grab Hook Load Support Geometry for Multi-Directional Chain Loads
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional grab hooks create point loads on chain links, leading to premature failure and reduced breaking strength, especially when loads are not aligned in-line.
Innovation Solution
A fixable grab hook design with a C-shaped body and non-planar surfaces, including beveled angles and multi-directional support shoulders, to distribute load stress evenly across a range of angles, preventing chain link distortion and shearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional grab hook with flat arcuate loading shape is used, then the hook can securely attach and lift loads, but the loaded link rotates creating point loads that cause high stresses and premature link failure
Solution Approach 1:
The hook body features a non-planar load support surface with specific geometric contours including a rounded load bearing surface and flared sides. These localized geometric features distribute the load across a broader area of the chain link, preventing point loads while maintaining secure attachment. The load support surface is specifically shaped to contact the chain link along its curvature rather than at a single point.
Solution Approach 2:
The load support surface incorporates a rounded or curved geometry rather than flat surfaces. The rounded load bearing surface and flared sides create a spherical or spheroidal contact region that naturally distributes forces across the chain link. This curvature prevents the chain link from rotating and concentrating stress at sharp points, thereby preventing premature failure.
2Strength
If previously known hook designs with saddle, wings, or cradle support are used, then point loads are reduced for in-line loads, but the hook cannot self-align with loads pulling from a range of directions
Solution Approach 1:
The hook body is designed with a universal load support surface that can accommodate loads from multiple directions. The non-planar surface with flared sides and rounded contours provides support for both in-line and angled loads. This multi-functional design eliminates the need for separate alignment mechanisms while maintaining point load reduction across various loading scenarios.
Solution Approach 2:
The hook design allows the chain link to dynamically adjust its position within the throat while maintaining proper contact with the load support surface. The flared sides guide the chain link into the correct position, and the rounded surface accommodates angular variations. This dynamic adaptation enables the hook to self-align with loads from a range of directions without compromising strength.
3Device complexity
If a fixed grab hook design is used, then the hook structure is simple, but it creates localized stresses that cause chain link distortion and shearing
Solution Approach 1:
The hook body incorporates localized geometric features including a rounded load bearing surface, flared sides, and specific contour shapes. These localized features are strategically positioned to distribute stresses evenly across the chain link contact area. The simple overall hook structure is enhanced with these specific local geometric qualities that prevent stress concentration and maintain chain link integrity.
Data Source
AI summary
A fixable grab hook is disclosed, which includes an arced load support area for supporting a link of chain throughout a range of load angles without creating localized stresses which would cause the link of chain to fail prematurely. The fixable grab hook has a general C-shaped hook body defined by a top region, a bottom region, and bridging portion connecting the top region and bottom regions together at one end in a spaced relation to define a throat therebetween within which a link of chain is releasably engageable. The bridging portion includes a non-planar surface defining a multi-directional load support area.