Universal Drum Fall Arrest Block with Sealed Brake
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fall arrest blocks require different drum designs for various types of lifelines, leading to increased complexity, weight, and stocking costs, as well as the need for multiple block designs to accommodate different lifelines.
Innovation Solution
A drum with a skeletal plastics moulding core and flanges, featuring separate anchorage points for wire rope and webbing, and a sealed brake unit with interengaging formations to prevent rotation and engage a pawl for locking during falls, allowing for a single block design to accommodate multiple lifeline types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different drum designs are used for various types of lifelines, then each lifeline type can be optimally accommodated, but device complexity and stocking costs increase
Solution Approach 1:
The drum is designed with a universal core structure that can accommodate multiple types of lifelines (wire rope, webbing, fibre rope) through a single design. The core includes different anchorage point configurations that can be selectively used depending on the lifeline type, eliminating the need for multiple specialized drum designs while maintaining optimal compatibility with each lifeline type.
2Adaptability or versatility
If multiple block designs are used to accommodate different lifelines, then each lifeline type can be properly handled, but weighting and distribution complexity increase
Solution Approach 1:
The fall arrest block incorporates the universal drum design, enabling a single block model to handle all lifeline types. This eliminates the need for manufacturers and distributors to maintain multiple block designs in inventory, reducing stocking complexity and quantity requirements while maintaining full support for wire rope, webbing, and fibre rope lifelines.
3Adaptability or versatility
If conventional drum designs are used, then specific lifeline types can be accommodated, but weight increases
Solution Approach 1:
The drum core is constructed using composite materials that provide the necessary strength and durability to handle all lifeline types while reducing overall weight compared to conventional solid metal drum designs. The composite structure maintains structural integrity across different loading conditions while being lighter, thus resolving the contradiction between versatility and weight.
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 provides a lightweight, versatile fall arrest block that can handle different lifelines, reducing stocking costs and simplifying distribution, while ensuring effective fall arrest through a sealed brake unit that can be easily maintained.
Implementation Method 1
A spring is preferably provided to rewind the lifeline onto the drum
Implementation Method 2
friction surfaces within the unit which allow rotation between the first and second parts against the friction generated by the friction surfaces
Data Source
AI summary
A fall arrest block has a drum (40) on which a lifeline is wound and from which the line can be drawn off or drawn back on, as the work man moves towards and away from the block. One end of the lifeline is permanently secured to the drum, and the drum has sockets (50) for securing ends of more than one different type of lifeline. The block also has a brake (24) in the form of a sealed unit which can be removed and replaced with a fresh unit, when servicing of the brake is required.