Toeboard Fitting Wedge Space for Hatch Clearance
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Solution Overview
Problem
Existing toe board fittings in scaffolding systems, especially in modular trestle scaffolding, often cause obstructions when trying to open or close hatch covers, failing to meet safety regulations due to gaps between the toe boards and the scaffolding floor, and allowing relative movement of the boards that compromises safety.
Innovation Solution
A toe board fitting design featuring an offset sheet steel or flat steel with a fastening leg connected to a fixing leg having a slot for positive locking and anti-displacement, combined with a transition leg for secure attachment to scaffolding components, and an end leg that forms a connecting wedge receiving and displacement space, allowing for proper assembly and safety compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If offset toe board fittings are used to ensure safety regulations are met, then the toe boards can overlap the lateral edge of the scaffolding floor, but the hatch cover cannot be opened and/or closed again
Solution Approach 1:
The toe board fitting is divided into multiple functional legs: a fastening leg for securing to the board, a fixing leg with a slot for connection, a transition leg for angular adjustment, and an end leg for final positioning. This segmentation allows each leg to perform its specific function independently, resolving the conflict between maintaining safety overlap and enabling hatch cover operation.
Solution Approach 2:
The transition leg introduces a angular dimension to the otherwise planar fitting structure. By bending the steel sheet at an angle (typically 90 degrees) through the transition leg, the end leg can be positioned to clear the hatch cover area while still maintaining the required overlap with the scaffolding floor, thus solving the operational conflict.
2Reliability
If toe boards are installed to prevent gaps and ensure safety, then safety standards are met, but the installation becomes complicated and requires precise positioning
Solution Approach 1:
Multiple functions are merged into a single integrated fitting component. The fastening leg, fixing leg with slot, transition leg, and end leg are all formed as one piece of bent steel sheet, combining securing, connecting, angular adjustment, and positioning functions into one element that simplifies installation while maintaining safety.
Solution Approach 2:
The fitting design allows self-alignment and self-securing through its geometric features. The slot in the fixing leg and the corresponding geometry of the end leg enable automatic positioning and locking when two fittings are connected, reducing the need for precise manual positioning and complex installation procedures.
3Strength
If the end leg extends over the entire width of the second end, then secure fixation is achieved, but the connecting wedge cannot be inserted
Solution Approach 1:
The end leg is designed with non-uniform width extension: it extends partially over the second end of the steel sheet to provide sufficient fixation security, but stops before the full width to leave clearance space. This local variation in extension distance creates the necessary gap for connecting wedge insertion while maintaining adequate anchoring strength.
Solution Approach 2:
The connecting wedge acts as an intermediary element that bridges the gap between the end leg and the connecting head. The partial extension of the end leg creates a controlled clearance that allows the connecting wedge to be inserted and positioned correctly, enabling the assembly to be completed without requiring the end leg to extend fully.
Data Source
Figure 1~3
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Figure 7~8
AI summary
The fitting (20.1) is formed from a cranked steel sheet or flat steel bar (34) with an end (21.2) pointing away from another end (21.1). An end leg (41.1) extends over a portion of width of the former end, so that a port wedge receiving and/or displacement-free space (50) is formed. The receiving and/or displacement-free space is limited by the end leg in a width direction or transverse direction (28) of the fitting and is limited by a transition leg and/or a fixing leg (27.1) in a length direction or longitudinal direction (46) of the fitting. Independent claims are also included for the following: (1) a toe board comprising a plank (2) a structure comprising a passage cover.