Lashing Anchor With Two-Axis Joint and Planar Stop
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Solution Overview
Problem
Conventional lashing anchors cause plastic deformation of metal sheets due to point-like introduction of tensile forces, limiting efficient force distribution and leading to undesirable bulging, especially in thin perforated metal sheets.
Innovation Solution
A lashing anchor with a planar stop surface and a two-axis joint, potentially designed as a ball joint, allows for a more uniform distribution of tensile forces into the surrounding sheet metal, preventing bulging by enabling the lashing stop to assume various positions relative to the hook-shaped anchoring element, thus distributing forces independently of the pulling direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hook-shaped anchoring element with a point-like tip is used to engage behind the border of the anchoring opening, then the lashing anchor can be securely anchored in the anchoring opening, but tensile forces are introduced in a point-like manner into the sheet metal surrounding the anchoring opening, causing plastic deformation and bulging
Solution Approach 1:
The invention transitions from a point-like contact (0D) at the hook tip to a planar contact surface (2D) by providing a stop with a planar stop surface that bears against the inner surface of the perforated plate. This dimensional change distributes the tensile forces over a larger area, preventing point-like stress concentration and the resulting plastic deformation and bulging of the sheet metal.
Solution Approach 2:
The invention applies different functional qualities to different parts of the anchoring system: the hook-shaped anchoring element provides point-like engagement for secure anchoring, while the stop with the planar stop surface provides distributed force introduction to prevent deformation. This local differentiation of quality allows each component to optimize its specific function.
2Device complexity
If the lashing stop and hook-shaped anchoring element are firmly connected or connected via a swivel joint, then the structure is simple, but tensile forces from different directions cannot be efficiently introduced into the sheet metal, leading to unfavorable pulling directions causing plastic deformation
Solution Approach 1:
The lashing stop is designed with a planar stop surface that is preliminarily positioned to bear against the inner surface of the perforated plate. This preliminary positioning ensures that regardless of the pulling direction, the forces are always introduced through the planar surface rather than the hook tip, preventing plastic deformation before it can occur.
Solution Approach 2:
The planar stop surface acts as an intermediary between the lashing means and the sheet metal. Instead of forces being directly transmitted from the lashing means through the hook tip to the sheet metal (causing point-like stress), the stop surface mediates this force transmission by distributing it over a larger area.
Data Source
Figure 1a
Figure 1b
Figure 1c
AI summary
A lashing anchor (1) for anchoring a lashing device (2) to an anchoring opening (3) formed in a perforated sheet (4) of a loading platform of a commercial vehicle (5), wherein the lashing anchor (1) comprises: - a lashing stop (6) to which the lashing device (2), in particular a pull rope or pull strap, can be attached, - a hook-shaped anchoring element (7) for engaging behind the anchoring opening (3), wherein the hook-shaped anchoring element (7) has an arcuate section (8) for engaging behind the anchoring opening (3) and a stop (9) with a planar stop surface (12), wherein the stop (9) has a longitudinal extension (L), wherein the longitudinal extension (L) is substantially transverse to the arcuate section (8), wherein the stop (9) projects beyond the arcuate section (8) along its longitudinal extension (L), and - a joint (10) with at least two axes.which connects the lashing stop (6) to the hook-shaped anchoring element (7) pivotally about at least two axes, wherein the at least two-axis joint (10) has a first pivot axis (S1) and a second pivot axis (S2), wherein the two pivot axes (S1, S2) are orthogonal to each other.