Portable Davit Base with Pin-Under Mounting
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Solution Overview
Problem
Existing rooftop davit systems lack a portable and lightweight solution for easy installation and removal of davit bases on pedestals with mounting plates, often requiring complex designs and multiple parts, which can be cumbersome for single-person operation.
Innovation Solution
A portable davit base assembly with a simple design featuring opposed side plates and transverse support members, secured by concentric pin apertures and pivot pin apertures, allowing for easy attachment and detachment from a mounting plate, and equipped with a handgrip for single-person handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a portable and lightweight davit base is used, then ease of operation and single-person handling are improved, but attachment security and stability may worsen
Solution Approach 1:
The davit base is divided into separate components (base unit, mounting plate, securing pins) that can be easily assembled and disassembled. The base unit itself is segmented with opposed side plates and transverse support members, allowing for lightweight construction while maintaining structural integrity through modular design.
Solution Approach 2:
The base includes pre-positioned securing pin apertures and pivot pin apertures that are concentrically aligned, allowing for quick and secure attachment without complex alignment procedures. The downwardly extending lobe portions are pre-formed to engage with the mounting plate edges, ensuring proper positioning before final securing.
2Device complexity
If a simple design with few parts is used, then ease of manufacture and device complexity are improved, but attachment security and stability may worsen
Solution Approach 1:
Multiple functions are combined into the base unit: the opposed side plates provide structural support and define the mounting interface, the transverse support members provide additional structural integrity and resting surfaces on the mounting plate, and the concentric pin apertures provide both securing and pivoting functions. This integration achieves secure attachment without requiring multiple separate components.
Solution Approach 2:
The concentric pin apertures serve dual purposes: securing pins prevent removal of the base from the mounting plate, while pivot pins enable the davit mast to pivot between horizontal and vertical positions. This multi-functionality reduces the total number of apertures and components needed while maintaining secure attachment and operational flexibility.
3Reliability
If securing pins are positioned below the mounting plate, then prevention of base removal is improved, but installation complexity may worsen
Solution Approach 1:
The securing pin apertures are pre-positioned and concentrically aligned during manufacturing, so that when the base is placed on the mounting plate, the apertures automatically align with the pin locations below the plate. This preliminary alignment eliminates the need for complex field alignment procedures and allows installers to simply insert the pins to secure the base.
Data Source
AI summary
A portable davit base for removable attachment to a rooftop davit pedestal having a mounting plate includes two opposed side plates and two metal transverse supporting members for mounting on the mounting plate and secured thereto with connector pins that extend underneath edges of the mounting plate on opposite sides of the davit pedestal. The opposed side plates have vertically spaced apertures for inserting davit mast supporting pins for pivotal mounting of a mast on the assembly. A davit arm connected to the mast is rigidly attached to the portable davit mounting assembly for use in suspending scaffolding over the side of a building.