Low-Profile Davit Arm Base With Rotational Locking Mount
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Solution Overview
Problem
The existing davit arm bases for buildings require costly and complex installation methods, such as coring out concrete slabs, which is not straightforward and can be expensive, especially when the floor is made of concrete.
Innovation Solution
A davit arm holder with a base formed from planar layers of sheet material and an attachment mechanism that allows for a low-profile installation by using radially spaced slots and a rotational locking system, enabling the base to be anchored to a substrate without protruding above the floor surface, thus eliminating the need for extensive excavation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional davit arm base is installed in a concrete slab, then the socket can be fixed securely to the substrate, but the installation requires costly and complex coring out of the concrete slab
Solution Approach 1:
The base is segmented into multiple planar layers (first layer, second layer, third layer) that can be assembled together to achieve the required structural integrity without requiring complex installation procedures. The layered construction allows the base to be pre-assembled and then installed as a unit, eliminating the need for coring out concrete slabs while maintaining secure attachment capability
Solution Approach 2:
The base utilizes a multi-layer vertical structure that distributes the attachment function across different height levels. The first layer provides the mounting surface, the second layer provides structural support, and the third layer provides additional anchoring points, creating a distributed attachment system that achieves reliability without requiring deep penetration into the substrate
2Ease of manufacture
If the base is made with multiple planar layers, then the installation process is simplified and costs are reduced, but the structural integrity and load-bearing capacity must be maintained
Solution Approach 1:
The multiple planar layers are merged together through the attachment mechanism (bolts, welds, or mechanical fasteners) to create a unified structural assembly. The layers work together as an integrated system where the combined strength of all layers plus the attachment mechanism exceeds the load-bearing requirements, achieving both installation simplicity and structural integrity
Solution Approach 2:
The base employs a composite construction using different materials for different layers (e.g., steel plates, reinforced concrete, or composite panels) that are bonded or mechanically connected. This composite structure optimizes the strength-to-weight ratio and distributes loads across multiple material types, maintaining load-bearing capacity while enabling simplified installation
3Shape
If the base has a low-profile design, then it does not protrude above the floor surface and can be used for other purposes, but the attachment mechanism must still provide secure engagement
Solution Approach 1:
The attachment mechanism is nested within the low-profile base structure, with the socket or mounting interface recessed into the base plate. The attachment components (bolts, fasteners, locking mechanisms) are contained within the footprint of the base and do not extend above the floor surface, maintaining the low-profile appearance while providing secure engagement through internal mechanical features
Solution Approach 2:
The attachment mechanism incorporates periodic features such as threaded fasteners, cam locks, or detent mechanisms that provide secure engagement through repeated mechanical interference. These periodic structural features (threads, ribs, flanges) create multiple contact points that distribute attachment forces while maintaining a compact external profile
Data Source
AI summary
A davit arm holder 30,50 for a davit arm 11-18 for suspending lines 4 from elevated heights by mounting the davit arm 11-18 on a structural substrate 1. The davit arm holder 30,50 comprises a base 50 formed from one or more planar layers 52 of sheet material adapted to lie parallel to the plane of a surface of the substrate 1, and an attachment 30 adapted to be fixedly attached to the base 50 and to provide a connection 32 to engage a davit arm 11-18. The base 50 includes an outer layer 52 and at least one inner mount 60. The outer layer 52 has a plurality of first engagement portions 70 that are radially spaced from a centre point 54 of the base 50. The at least one inner mount 60 is integrally formed with the outer layer 52, is fixedly securable to the substrate 1 and is adapted to space an inside surface 68 of the outer layer 52 from the substrate 1 to form a gap 66 under the outer layer 52. The base 50 is adapted to have a low-profile when anchored to the substrate 1. The attachment 30 is adapted to be releasably engaged to the base 50 by a plurality of second engagement portions 40 adapted to engage the corresponding plurality of first engagement portions 70 by rotation of the attachment 30 about an axis 56 perpendicular to the plane of the substrate 1.