Ladder Hinge Assembly for Stable Step-to-Extension Reconfiguration
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Solution Overview
Problem
Combination ladders, while popular, often require structural support for extended configurations and lack efficient mechanisms for transitioning between self-supporting and extended positions, limiting their versatility and stability.
Innovation Solution
A hinge assembly with a releaser mechanism that allows for the radial movement of a pin between slots, enabling seamless transitions between locked and unlocked configurations, facilitating the conversion of a combination ladder between self-supporting and extended positions without the need for external support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a combination ladder is designed to be self-supporting in step ladder configuration, then stability without external support is improved, but the ability to extend to increased height is limited
Solution Approach 1:
The ladder incorporates a hinge assembly that enables dynamic reconfiguration between a self-supporting step ladder configuration and an extended straight configuration. The hinge allows the ladder to transition between these states, providing stability when needed and extended height when required, thus resolving the contradiction between stability and height capability.
Solution Approach 2:
The combination ladder is designed to perform multiple functions through a single structure: it can operate as a self-supporting step ladder for stable access in open spaces, and as an extended straight ladder for reaching greater heights when leaned against structures. This multi-functionality allows the ladder to address both stability and height requirements depending on the application.
2Adaptability or versatility
If a hinge assembly is added to enable configuration transitions, then versatility is improved, but device complexity increases
Solution Approach 1:
The hinge assembly merges multiple functions into a single mechanism: it enables configuration transitions, provides structural connection between ladder sections, and incorporates a pin-slot locking system for stable positioning. By combining these functions into one integrated assembly, the design achieves versatility without proportionally increasing complexity.
Solution Approach 2:
The hinge assembly includes a self-locking mechanism where the pin automatically engages with the slot at predetermined positions to secure the ladder configuration. This self-service feature eliminates the need for additional locking components or complex control systems, achieving versatility through a relatively simple self-contained mechanism.
3Reliability
If a pin-slot locking mechanism is used for configuration stability, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The locking mechanism is extracted into a separate pin and slot assembly that can be independently actuated. The pin can be manually moved between engaged and disengaged positions in the slot, allowing reliable locking when needed while enabling easy manual operation for configuration transitions. This separation of locking function from the main structure achieves both reliability and ease of operation.
Data Source
AI summary
Ladders and ladder components are described herein, including multipurpose and adjustable ladders. In one embodiment, a ladder includes a first assembly having rails and rungs, a second assembly having rails and rungs, and one or more hinges coupling the first and second assemblies together such that the first and second assembly may be positioned relative to one another in at least a position or state and at least a second position or state. The ladder is adjustable by moving a pin from a locked state in which it is located in a recess or slot of the hinges and prevents rotation of the hinges to an unlocked state in which it is removed from the recess or slot. Multiple joints can be simultaneously transitioned between locked and unlocked states using a releaser to move the pin, and a spring can bias the pin into a locked state.