Ladder Bracing With Ramped Surfaces to Prevent Rail Interference

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Solution Overview

Problem

There is a need for ladders with adjustable components that enhance stability and utility while providing improved functionality on various support surfaces, and to address issues such as interference between inner and outer rails during collapsing.

Innovation Solution

The ladder design includes slidable rail assemblies with adjustable braces and hinges, featuring ramped surfaces on cross-braces to prevent interference and enhance stability, allowing for multiple configurations and surface adaptations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If adjustable components are added to enhance functionality and adaptability, then the ladder can be used on various support surfaces, but the device complexity increases

Engineering Contradiction:

Improveadaptability to various support surfacesVSAvoidcomplexity of adjustable components

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The ladder incorporates adjustable braces with ramped surfaces that can be positioned at different angles and locations along the rail assemblies. This dynamic adjustment capability allows the ladder to adapt to various support surfaces and configurations while maintaining structural integrity through controlled mechanical movement.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The ladder structure is divided into modular components including separate rail assemblies, adjustable braces, and rungs. Each component can be independently positioned or adjusted, allowing for versatile configurations without requiring complete redesign of the entire structure. The segmented design enables localized adjustments for different surface conditions.

Inventive Principle:

Principle #1Segmentation

2Stability of the object's composition

If braces are added to enhance stability, then the ladder becomes more stable, but the device complexity increases

Engineering Contradiction:

Improvestability of ladderVSAvoidcomplexity of bracing system

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The braces are equipped with ramped surfaces at specific locations where they contact the rail assemblies. This localized geometric feature provides the necessary friction and mechanical interlocking only at the critical contact points, enhancing stability without requiring complex bracing structures throughout the entire ladder.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The braces can be adjusted to change their angle and position parameters relative to the rail assemblies. By varying these geometric parameters, the ladder achieves different stability configurations suitable for various operating conditions while using the same basic brace components.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If inner rails are made slidable in outer rails for adjustability, then the ladder becomes more versatile, but interference between rails during collapsing occurs

Engineering Contradiction:

Improveadjustability of rail assembliesVSAvoidinterference between inner and outer rails

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The ramped surfaces on the braces feature curved transition portions that guide the inner rails smoothly along a curved path during adjustment and collapsing operations. This curvature eliminates sharp corners and abrupt contact points, preventing the inner rails from catching or interfering with the outer rails while maintaining the sliding mechanism's adjustability.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The potential interference between sliding rails is converted into a beneficial friction-based locking mechanism. The ramped surfaces create controlled friction that prevents unintended slippage during normal use, while still allowing intentional adjustment when needed. The same friction that could cause interference becomes a feature that enhances grip and stability.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS12523095B2Ladders and ladder bracing

Publication Date: 2026.01.13 LITTLE GIANT LADDER SYSTEMS LLC

AI summary

A ladder with bracing is provided. In one embodiment, the ladder may include a first rail assembly comprising a pair of inner rails and a pair of outer rails, the pair of inner rails being slidably disposed in a upper portion of pair of outer rails, wherein a rear surface of each of the pair of outer rails lies in a common plane. A first plurality of rungs may be coupled between the pair of inner rails, and a second plurality of rungs coupled between the pair of outer rails. A brace may extend between and be coupled to the pair of outer rails, wherein the brace includes a first ramped surface, the first ramped surface having a first portion spaced away from the common plane, a second portion immediately adjacent the common plane, and a transition portion extending between the first portion and the second portion.