Platform Ladder Railing Locking for Fast Stable Setup

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Solution Overview

Problem

Existing platform ladder apparatuses lack stability, ease of handling, and require significant time for setup and repositioning, especially when used by a single person.

Innovation Solution

A platform ladder apparatus with a foldable safety railing featuring rotatable and telescopic locking members that provide mechanical guidance for secure locking and unlocking, ensuring stability and quick setup, and includes additional engagement elements to prevent lateral movement of the railing posts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a foldable safety railing is added to the platform ladder apparatus, then stability and safety are improved, but device complexity and setup time increase

Engineering Contradiction:

ImprovestabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The safety railing is divided into separate foldable posts that can be independently collapsed and stored, allowing the stability function to be present during use but removed during transport, thus managing complexity dynamically

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The railing posts transition between fixed (stable) and folded (compact) states, making the structural complexity dynamic rather than static, allowing the system to adapt between operational and transport modes

Inventive Principle:

Principle #15Dynamics

2Reliability

If a foldable safety railing is added to the platform ladder apparatus, then stability and safety are improved, but the time required for setup and repositioning increases

Engineering Contradiction:

ImprovestabilityVSAvoidsetup time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The railing posts are pre-configured in folded positions within the platform structure, so that when needed they can be quickly deployed outward and locked into place without requiring complex assembly steps

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The locking mechanism appears to allow the railing posts to secure themselves automatically when deployed, reducing the need for manual adjustment and speeding up the setup process

Inventive Principle:

Principle #25Self-service

3Ease of operation

If the railing post is made rotatable for folding, then ease of transport is improved, but stability in the raised position may be compromised

Engineering Contradiction:

Improveease of handlingVSAvoidstability

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The locking mechanism prevents the railing post from rotating away from its locked raised position by providing a mechanical stop or engagement feature that counteracts any rotational force that might compromise stability

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentEP4464867B1Platform ladder apparatus

Publication Date: 2025.11.19 STASAKER AB

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AI summary

There is disclosed a ladder platform apparatus (2), comprising a ladder (4), a working platform (20), and a foldable safety railing (40). Locking devices (100; 200) are arranged to lock railing posts (44) of the safety railing (40) in their raised position of use. Each locking device (100; 200) has a locking member (102; 202) movable between a non-locking position in which an associated railing post (44) is free to rotate in relation to the working platform (20), and a locking position in which the locking member (102; 202) is in engagement with a front side and a rear side, respectively, of the railing post (44), and in which the locking member (102; 202) is prevented from rotating in relation to the working platform (20), thereby preventing the railing post (44) from rotating away from its locked raised position.