Stepladder Latch Mechanism for Secure Open-Position Locking
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Solution Overview
Problem
Existing stepladders lack a secure mechanism to lock in the open position, risking accidental folding and potential user injury.
Innovation Solution
A stepladder design featuring a latch that engages with a first stud separate from the cross bar, preventing the stepladder from folding while in use and allowing easy folding when the latch is disengaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a latch mechanism is added to lock the stepladder in the open position, then safety and stability are improved, but device complexity increases
Solution Approach 1:
The latch mechanism is divided into separate functional components: a latch body, a stud, a spring, and a cam. This segmentation allows each component to perform its specific function independently while maintaining overall system reliability without excessive complexity.
Solution Approach 2:
The spring-loaded cam mechanism automatically engages and disengages the latch based on the stepladder's position. When the stepladder opens, the cam automatically pushes the latch onto the stud to lock it; when closed, the cam automatically releases it, eliminating the need for manual operation and reducing control complexity.
2Reliability
If the latch engages with a stud separate from the cross bar, then the locking reliability is improved, but the structural complexity increases
Solution Approach 1:
The locking function is separated from the cross bar structure by introducing a dedicated stud component. This segmentation allows the cross bar to maintain its primary structural function while the stud provides a dedicated, simple engagement point for the latch, improving reliability without significantly increasing overall structural complexity.
Solution Approach 2:
The stud acts as an intermediary element between the cross bar and the latch mechanism. It provides a simple, dedicated engagement point that improves locking reliability while keeping both the cross bar and latch structures relatively simple.
3Ease of operation
If the latch is designed to be easily unlatched, then ease of operation is improved, but locking strength may be reduced
Solution Approach 1:
The spring-loaded cam mechanism automatically provides the force needed to engage and disengage the latch. The spring stores energy during engagement and releases it during disengagement, making the operation easy while maintaining strong locking when engaged.
Solution Approach 2:
The latch mechanism transitions between two dynamic states: a locked state where the cam holds the latch against the stud with spring force, and an unlocked state where the cam rotates to release it. This dynamic design allows easy transition between states while maintaining strong locking in the engaged position.
Data Source
AI summary
A stepladder includes a front section having a first front leg and a second front leg. The stepladder includes a step attached to the first front leg and the second front leg. The stepladder includes a latch engaged with the step. The stepladder includes a rear section having a first rear leg and a second rear leg and a cross bar attached to the first rear leg and the second rear leg. The rear section is pivotably attached to the front section. The rear section has a first stud which extends from the first rear leg toward the second rear leg and separate and apart and not in contact with the second rear leg and not in contact with the cross bar. The latch is engaged with and latched to the first stud to define an engaged position where the first front leg and the first rear leg are in an open position and form an inverted v shape and are prevented from folding together, and the latch when pulled up from the engaged position, disengages from the first stud and allows the front section and rear section to fold together into a closed position where the first rear leg and the first front leg are in parallel. A method of positioning a step ladder.