Folding Mast for Bridge Erection Boat
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Solution Overview
Problem
Current mast technologies for bridge erection boats are cumbersome, blocking critical boat functionalities when stowed and requiring removal to prevent obstruction, as they are typically single-piece and do not allow for tool-free assembly or disassembly.
Innovation Solution
A folding mast system with bi-folding capability, featuring conical male and female sockets for alignment, a tool-free centering clamp, and a backup safety pin for secure operation, allowing quick assembly and disassembly without obstructing vessel functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single-piece mast is used, then the mast structure is simple and strong, but it blocks access to critical boat functionality when stowed and requires removal to prevent obstruction
Solution Approach 1:
The mast is divided into two separate sections that can be folded relative to each other. The first section attaches to the boat and the second section attaches to the first section, allowing the mast to be folded down to clear the engine hatch, waterjet hatch, and capstan while maintaining structural integrity when erected.
2Ease of operation
If a single-piece mast is used, then the mast provides continuous support, but it requires removal entirely to prevent obstruction of functionality
Solution Approach 1:
The mast transitions from a static single-piece structure to a dynamic two-section structure that can be folded and unfolded. The hinge connection with conical sockets and clamp mechanism enables quick transformation between erected and stowed positions without complete removal, reducing time loss while maintaining access to boat functionality.
3Ease of manufacture
If a folding mast with loose tolerances is used, then alignment is easier and fabrication differences are accommodated, but the connection may be less precise
Solution Approach 1:
Conical sockets with approximately 30-degree included angles are used at the hinge connection. The conical geometry provides self-aligning properties that accommodate fabrication tolerances and wear while maintaining precise centering when the clamp is tightened, combining ease of manufacture with adequate connection precision.
4Manufacturing precision
If conical sockets are used for alignment, then the two mast sections center automatically, but the clamp must exert sufficient force to maintain centering under load
Solution Approach 1:
A safety pin is installed through the hinge in addition to the clamp mechanism. This provides a backup connection that prevents accidental mast collapse if the clamp fails or loosens, cushioning against the harmful effect of potential connection failure while allowing the clamp to maintain centering under normal operating loads.
Data Source
AI summary
The device disclosed herein is for a folding mast device for use on watercraft. In the preferred embodiment, the mast is used on a bridge erection boat; however, additional watercraft may also incorporate this device. The mast includes clamps and other components in order to allow the mast to be assembled and disassembled without tools, which also makes the assembly and disassembly quick. The mast is also quickly removable and replaceable. The mast also can incorporate safety features, such as lighting and other devices needed for safe navigation, and is capable of adjusting to accommodate fabrication differences.