Pocket Ladder Assembly with Door-Interlock Safety Mechanism
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Solution Overview
Problem
Existing boat ladder systems are not ideal as they can be inadvertently left deployed, posing safety risks, and require significant modifications to the boat's design, making them impractical for deployment and retraction.
Innovation Solution
A pocket ladder assembly that includes a collapsible ladder stowed in an enclosure adjacent to a door opening, which can be manually deployed and retracted without extensive redesign, featuring a telescoping mechanism and a threshold plate that ensures the ladder can only be deployed when the door is open, preventing accidental extension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a permanently attached foldable ladder is positioned at the stern or bow, then the ladder provides consistent access to water, but the boat operator may not notice whether the ladder has been deployed or retracted
Solution Approach 1:
The ladder is extracted from the traditional stern/bow position and relocated to a pocket enclosure at the side door, where it can be visually monitored and physically controlled during door operation
Solution Approach 2:
The system provides visual feedback through the door opening position and physical feedback through the door operation sequence, ensuring the operator is always aware of the ladder's deployment status
2Adaptability or versatility
If access doors on sidewalls with removable ladders are provided, then the ladder can be placed and removed at the door opening, but significant modifications to the deck and hull are required
Solution Approach 1:
The ladder is nested within a pocket enclosure that is integrated into the existing door structure, allowing the ladder to be stored compactly when not in use and deployed quickly when needed, without requiring major structural changes to the boat
Solution Approach 2:
The door structure serves multiple functions: it provides access to the boat, contains the pocket enclosure for the ladder, and acts as a control mechanism for ladder deployment, eliminating the need for separate ladder mounting structures
3Volume of moving object
If the ladder is made retractable without leaving it in the passenger area, then space is saved, but the retraction mechanism becomes more complex
Solution Approach 1:
The collapsible ladder nests within the pocket enclosure when retracted, utilizing the vertical space within the door structure rather than requiring separate storage compartments in the passenger area
Solution Approach 2:
The ladder transitions from a static stored position to a dynamic deployed position through a simple collapse mechanism that allows the ladder to fold into itself, reducing the need for complex motorized retraction systems
4Shape
If the ladder is hidden from view when not in use, then the boat appearance is improved, but the ladder must be integrated into the door structure requiring modifications
Solution Approach 1:
The ladder is nested within a pocket enclosure that is integrated into the door structure, allowing the ladder to be stored compactly when not in use and deployed quickly when needed, without requiring major structural changes to the boat
Solution Approach 2:
The pocket enclosure merges the ladder storage function with the existing door structure, creating a unified component that maintains the boat's exterior appearance while providing hidden ladder storage
Data Source
AI summary
A boat with a deck has a sidewall or railing at the periphery of the deck, a door opening in the sidewall with a hinged door, and a pocket ladder assembly adjacent the door opening. The pocket ladder assembly including a stowing enclosure and an access port on one side of the stowing enclosure facing the door opening. A collapsible ladder when in an upright compacted stowed configuration is receivable and stowable in the stowing enclosure. The ladder in the upright stowing configuration is movable laterally out of the stowing enclosure into a door opening seating position when the door is in an open position. The collapsible ladder then rotatable from the upright stowing configuration to an intermediate configuration. The ladder then further convertible from the intermediate configuration to a fully deployed configuration, where the ladder extends outwardly and downwardly from the boat deck.