Extendable Ladder Lock Assembly for Automatic Section Locking

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Solution Overview

Problem

Current locking systems for extendable ladders require separate actions to unlock extendable sections, which can lead to undesired movement and potential damage or injury, and are intrusive into the user's working space.

Innovation Solution

A climbing product with a lock assembly that allows sections to be locked and unlocked by simply moving the fly section relative to the base section, reducing the need for separate actions and minimizing intrusion into the user's workspace.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a separate action is required to unlock extendable sections, then the locking system provides secure locking, but the operation becomes burdensome and introduces potential errors

Engineering Contradiction:

Improvesecure lockingVSAvoidoperation complexity

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The locking system automatically locks the extendable sections when they are extended, eliminating the need for separate manual locking actions. The lock fly portion and lock base portion engage automatically through the relative movement of sections, making the system self-servicing and reducing operational burden while maintaining secure locking.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

Instead of requiring a separate action to lock the sections, the system inverts the approach by automatically locking them through the natural extension movement. The locking action occurs as a consequence of the extension motion itself, rather than requiring an additional independent action.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If traditional locking systems are used, then locking function is provided, but they are large and intrusive into user's working space

Engineering Contradiction:

Improvelocking functionVSAvoidworkspace intrusion

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The lock fly portion is positioned within or adjacent to the extendable sections, nesting the locking mechanism within the existing structure. This eliminates the need for separate external locking components that would intrude into the user's working space, while still providing reliable locking function.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The locking mechanism operates in a dimension parallel to the extension movement, using the relative motion between sections to engage the lock fly portion with the lock base portion. This allows the locking system to be compact and integrated without protruding into the user's workspace.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS12448841B2Climbing product having an extendable section lock assembly

Publication Date: 2025.10.21 WERNER CO

AI summary

A climbing product whose sections are extendable having a base section and a fly section. The fly section in sliding engagement with the base section. The climbing product has a lock assembly having a lock fly portion directly attached to the fly section. The lock fly portion directly engages with the base section to lock the base section with the fly section. The lock fly portion has a plunger. The lock fly portion disengages from the base portion by moving the plunger. A method for using a ladder whose sections are extendable. A method for constructing a ladder whose sections are extendable.