Stepladder Platform Spreader Mechanism for Compact Folding Storage
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Solution Overview
Problem
Traditional stepladders have fixed steps, which limit their compactness and user convenience when not in use, as they cannot be easily folded or stored in a compact form.
Innovation Solution
A stepladder design featuring a foldable platform assembly with pivotably connected platforms and linkages, allowing the ladder to transition between open and closed positions while maintaining the platform within the structural boundaries, enhancing storage and transport convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If fixed steps are used in traditional stepladders, then structural simplicity is maintained, but compactness and storage convenience deteriorate
Solution Approach 1:
The patent applies the dynamics principle by transforming the fixed, static steps into movable, dynamic platform assemblies that can pivot between extended and retracted positions. The platforms are connected to the ladder frames through pivot points and linkages, enabling them to move relative to the frame while maintaining structural support functionality. This dynamic configuration allows the ladder to achieve compact storage by folding the platforms within the frame boundaries while preserving structural integrity during use.
2Ease of operation
If platform assemblies with pivotable connections are used, then compactness and storage convenience improve, but device complexity increases
Solution Approach 1:
The patent implements the nesting principle by designing the platform assembly to fold within the boundaries of the ladder frame when in the closed position. The first and second platforms, along with their associated linkages, are configured to nest inside the spatial envelope defined by the frame thickness, allowing the entire platform assembly to be contained within the frame's structural boundaries during storage.
3Volume of moving object
If the platform assembly is folded within frame boundaries, then storage efficiency improves, but ease of operation may worsen
Solution Approach 1:
The patent applies segmentation by dividing the platform assembly into discrete, modular components including the first platform, second platform, linkages, and pivot connections. This segmentation allows each component to move independently through defined arcs and positions, enabling the complex folding motion to be broken down into manageable segments that are easier to operate and control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the stepladder to be efficiently stored in a compact form by folding the platform assembly within the structural boundaries, improving user convenience and storage capabilities without compromising the structural integrity or user safety.
Implementation Method 1
a first platform pivotably coupled to the first frame, a second platform pivotably coupled to the first frame
Data Source
AI summary
A stepladder including a pair of front rails, a pair of second rails, a top cap, a fixed step, and a spreader mechanism. The spreader mechanism includes a platform pivotably mounted to the pair of front rails, spreader arms pivotably mounted to the pair of rear rails , and spreader pivot. The stepladder is moveable between a closed position and an open position, the open position limited by the spreader mechanism.