Scissor Deck Access Arrangement with Rotating Stair Assembly
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Solution Overview
Problem
Scissor lifts require significant vertical space even when collapsed, and conventional ladder assemblies can enlarge the footprint, making it cumbersome for operators to access the platform, especially when carrying materials or changing tasks.
Innovation Solution
A lift device with a stair assembly that is selectively repositionable between a stored and deployed position, allowing the stair assembly to rotate relative to the frame assembly, thereby reducing the overall size when stored and providing easy access to the platform when deployed, without enlarging the footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional fixed ladder assembly is used to access the platform, then the footprint of the scissor lift is minimized, but the ease of operation deteriorates because operators must climb vertical ladders multiple times per day
Solution Approach 1:
The stair assembly is made dynamically reconfigurable between a deployed configuration (providing inclined stair access to the platform) and a stored configuration (reducing footprint). This dynamic transformation allows the system to adapt its structure based on operational needs, resolving the contradiction between ease of access and device complexity.
Solution Approach 2:
The stair assembly utilizes the vertical dimension by folding upward into the space above the platform when stored, rather than extending horizontally. This dimensional transformation allows the access structure to be compact during transport while providing full access functionality during operation, addressing both ease of operation and footprint constraints.
2Ease of operation
If the scissor assembly is collapsed to minimize vertical space, then the platform is raised above the ground, but the ease of operation worsens because operators cannot easily access the platform
Solution Approach 1:
The stair assembly acts as an intermediary element between the ground and the elevated platform. It provides a gradual inclined transition that mediates the height difference, allowing operators to safely and easily access the platform even when the scissor assembly is collapsed and the platform is raised above ground level.
3Ease of operation
If a ladder assembly is positioned to facilitate access, then the ease of operation improves, but the area occupied by the device increases
Solution Approach 1:
The stair assembly nests within the vertical space above the platform when not in use, similar to a nested doll structure. This nesting approach allows the access structure to be completely contained within the existing footprint of the scissor lift, providing platform access functionality without increasing the horizontal area occupied by the device.
Data Source
AI summary
A lift device includes a chassis, a platform disposed above the chassis, a lift assembly coupling the platform to the chassis and configured to move the platform between a lowered position and a raised position, and a stair assembly coupled to at least one of the platform and the chassis, the stair assembly including a first step and a second step. The platform includes a deck defining a top surface configured to support an operator. The stair assembly is selectively repositionable relative to the chassis between a stored position and a deployed position. The stair assembly facilitates access to the deck from the ground when in the deployed position.