Adjustable Step Ladder Working Tray for Safe Upper-Rung Access
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Solution Overview
Problem
Step ladders limit user height and safety due to prohibition on standing on upper rungs, lack of balance support, and fixed working trays that become less accessible as users ascend, leading to potential injuries and deaths when users attempt to reach further.
Innovation Solution
A step ladder device with a movable working portion and grab bar that can be elevated relative to the base step ladder, allowing users to safely work on upper rungs and extending the ladder's functionality by converting it into a longer ladder with additional working rungs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If users stand on the highest rungs of the step ladder to reach further, then the working height is increased, but safety is compromised due to lack of balance support and no means to keep one's balance
Solution Approach 1:
The working tray is made movable rather than fixed, allowing it to be repositioned to different heights along the ladder structure. This dynamic adjustment enables users to maintain proper ergonomics while accessing higher work areas, eliminating the need to stand on unsafe upper rungs.
Solution Approach 2:
The movable working tray acts as an intermediary platform between the user and the ladder rungs. It provides a stable intermediate surface that supports users at elevated positions without requiring them to directly stand on the ladder's upper rungs, thereby maintaining safety while increasing working height.
2Device complexity
If the working tray is fixed at the top of the step ladder, then the structure is simple, but the tray becomes farther away and less handy as the user goes up the ladder
Solution Approach 1:
The working tray is designed with movable capability along the ladder structure, allowing users to reposition it to optimal heights. This dynamic feature maintains ease of operation throughout the full height range of the ladder, preventing the tray from becoming inaccessible as users ascend.
3Reliability
If a longer step ladder is purchased to safely work at higher elevations, then safety is improved, but the ladder takes more room to transport and store
Solution Approach 1:
The movable working tray allows a standard six-foot step ladder to function effectively as a ten-foot ladder. By repositioning the tray to higher positions on the existing structure, users gain access to greater working heights without needing to purchase and store a longer ladder, thereby reducing transport and storage space requirements.
4Length of moving object
If users ignore the warning and stand on the highest steps to reach further, then working height is increased, but injuries and deaths occur
Solution Approach 1:
The movable working tray provides preliminary anti-action by preventing users from needing to stand on unsafe upper rungs in the first place. By allowing the tray to be positioned at various heights, the design proactively eliminates the dangerous behavior of standing on prohibited rungs while still achieving the desired working height.
Solution Approach 2:
The working tray serves as a safe intermediary platform that mediates between the user's need to reach higher and the safety constraints of the ladder design. It provides a stable intermediate surface that eliminates direct contact with unsafe rungs, thereby preventing injuries and deaths associated with ignoring safety warnings.
Data Source
AI summary
A step ladder device for improving the safe working elevation of a step ladder is provided. The step ladder device includes a working ladder portion that terminates in a rigid working tray providing a safety grab bar. The step ladder device is dimensioned and adapted to piggyback on to the step ladder so that the working ladder portion slidably moves in a coplanar orientation relative to the underlying step ladder, which enables the working tray to be locked in one of a plurality of selective working elevations relative to the underlying step ladder. As a result, the user can embrace the safety grab bar and balance themselves while standing on the upper rungs of the underlying step ladder or the lower rungs afforded by the working ladder portion.