Pool Ladder Safety Blocks for Child Access Control
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Solution Overview
Problem
Above-ground pools and spas often require ladders that allow only adult users to access them while ensuring children cannot, without compromising egress for any user.
Innovation Solution
A ladder with safety blocks that can be moved between a safety configuration, where ingress is restricted, and a ladder configuration, where access is allowed, using mechanisms like pivot screws, detents, and spring-damper systems to control access based on user input, ensuring only adults can toggle the configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If safety blocks are added to prevent child access, then safety is improved, but device complexity increases
Solution Approach 1:
The ladder is divided into a fixed portion and a moveable portion, with safety blocks that can be independently positioned. The safety blocks are segmented into individual units that can be selectively placed to block or allow access to specific steps, resolving the contradiction by adding safety functionality without requiring complete redesign of the entire ladder structure.
Solution Approach 2:
The safety blocks are made moveable rather than fixed, allowing them to transition between blocking and non-blocking positions. This dynamic capability enables the ladder to adapt between safe (blocked) and accessible (unblocked) states, improving safety while maintaining operational simplicity through straightforward block placement and removal.
2Reliability
If moveable portion is added to control access, then safety is improved, but ease of operation deteriorates
Solution Approach 1:
The safety blocks are pre-positioned in a default blocking configuration that prevents child access. Adults perform the preliminary action of placing or adjusting the blocks before use, ensuring safety is automatically maintained without requiring complex control mechanisms during operation.
Solution Approach 2:
The ladder system is designed to be self-regulating through the positioning of safety blocks. Once blocks are placed in the correct position, they automatically maintain the safe configuration without requiring active control or monitoring, simplifying operation while preserving safety functionality.
Data Source
AI summary
A ladder selectively allows or prevents user access to the ladder steps, such that the ladder can only be climbed when such access is allowed. For example, the ladder may only selectively allow ingress into a bathing enclosure, e.g., when operated by an adult, but always allows egress from the bathing enclosure by any user. The ladder includes one or more safety blocks moveable between a safety configuration, in which ingress is prevented or inhibited, and a ladder configuration, in which ingress and egress is permitted.