Weight-releasing ladder lockstep with pivoting shock links
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Solution Overview
Problem
Existing lockstep designs for rolling ladders face difficulties in easy positioning, safety hazards due to accidental release, and durability issues from misuse, particularly with two separate levers causing user confusion and vulnerability to being stepped over or bent.
Innovation Solution
A novel lockstep mechanism using a single pedal for lifting, with compression springs and pivoting shock links to support the ladder's weight and absorb vibrations, ensuring the ladder automatically retracts front wheels upon user weight, eliminating the need for a trip bar and enhancing safety by preventing accidental release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single pedal is used to lift the ladder into rolling position, then ease of operation is improved, but the mechanism becomes more vulnerable to being stepped over or bent out of position
Solution Approach 1:
The pedal is designed to pivot between a horizontal position (when not in use) and a vertical position (when activated). This dynamic positioning allows the pedal to be stepped on easily to activate the rolling mechanism, while automatically returning to its protected horizontal position when not in use, preventing accidental activation and reducing vulnerability to being stepped over or bent
2Object-affected harmful factors
If the ladder automatically releases upon user weight, then safety is improved, but the mechanism becomes more sensitive to vibrations and false activation
Solution Approach 1:
The release mechanism is calibrated to respond to a specific weight threshold parameter. The latch is designed with spring tension and geometric parameters that require a minimum force (corresponding to human body weight) to trigger release, while normal vibrations and minor forces during rolling do not accumulate sufficient force to activate the release, thus preventing false activation while maintaining safety
3Reliability
If two separate levers (pedal and trip bar) are used, then reliability is improved, but device complexity increases and user confusion occurs
Solution Approach 1:
The pedal and trip bar functions are merged into a single integrated pedal mechanism. The pedal performs both the lifting function (by pivoting to vertical position) and the release function (by transferring user weight through the latch mechanism). This consolidation eliminates the need for a separate trip bar, reducing component count and simplifying the user interface while maintaining the dual functionality of lifting and releasing
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
Facilitates easy positioning and safe operation by automatically retracting front wheels upon user weight, preventing accidental release and ensuring compliance with safety regulations, while maintaining durability and ease of use.
Implementation Method 1
compression springs and pivoting shock links to support the ladder's weight and absorb vibrations
Implementation Method 2
pivoting shock links and springs... isolated from rolling vibrations through pivoting shock links and springs
Implementation Method 3
as soon as the user applies a predetermined amount weight... the shock link pivots up causing the release bar to mechanically release a latch
Data Source
AI summary
A novel lockstep mechanism for a rolling ladder is described. The weight-releasing ladder lockstep allows a ladder to be relocated on wheels but when a person climbs the ladder, the front wheels are automatically retracted and the ladder rests firmly with its front feet on the floor. When in the climbing (stationary) position the front wheels of the lockstep are retracted and the ladder rests on the lockstep's feet. When in the rolling position, the ladder is tilted slightly back on its rear wheels and the wheels of the lockstep are pushed down to allow the ladder to roll. When in the rolling position, the lockstep wheels are held in place via a latch which is isolated from rolling vibrations through pivoting shock links and springs.