Stepladder Latch Stud Mechanism for Secure Open Locking
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Solution Overview
Problem
Folding stepladders often fail to securely lock in the open position, risking accidental folding and user injury, and existing latch designs lack clear engagement indication and ease of use.
Innovation Solution
A stepladder design featuring a latch that engages with a separate stud to maintain an open position and includes a restoring mechanism with springs to ensure secure locking and easy folding, with a cam and hook mechanism for secure engagement and disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a folding stepladder uses a conventional latch design, then the structure is simple, but the stepladder fails to securely lock in the open position and risks accidental folding
Solution Approach 1:
The latch mechanism is divided into separate functional components: a latch arm, a cam member with cam surface, a hook member, and a restoring mechanism. This segmentation allows each component to perform its specific function efficiently while maintaining overall reliability of the locking system.
Solution Approach 2:
The latch mechanism incorporates dynamic elements including a cam surface that rotates to engage or disengage the hook, and a restoring mechanism with springs that automatically returns the latch arm to the engaged position. This dynamic design ensures secure locking while allowing easy transition between locked and unlocked states.
2Reliability
If a folding stepladder uses a secure latch mechanism, then accidental folding is prevented, but the operation becomes more complex and difficult to use
Solution Approach 1:
The restoring mechanism automatically returns the latch arm to the engaged position after disengagement, without requiring manual intervention. The spring-loaded cam and hook system self-actuates to ensure the latch is ready for the next locking cycle, simplifying user operation.
Solution Approach 2:
The restoring mechanism pre-positions the latch arm in the engaged state, ready to lock the stepladder as soon as it opens. This preliminary action ensures the latch is always prepared to secure the structure, reducing the effort needed by the user.
3Reliability
If a latch design provides secure locking, then user safety is improved, but clear indication of engagement is lacking
Solution Approach 1:
The patent employs visual indicators that change state based on latch engagement. The latch arm and cam member are positioned such that their relative locations provide clear visual feedback to the user about whether the stepladder is securely locked or can be folded.
4Ease of manufacture
If a stepladder structure is simplified, then manufacturing is easier, but the latch may contact unwanted components causing malfunction
Solution Approach 1:
The stud is extracted as a separate, dedicated engagement feature from the leg structure. This dedicated stud provides a precise, isolated contact point for the latch and cam mechanism, preventing unintended contact with other components while maintaining overall structural simplicity.
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
The design securely locks the stepladder in an open position, preventing accidental folding while allowing easy conversion to a closed position, providing a clear indication of engagement and ensuring user safety.
Implementation Method 1
a restoring mechanism with springs to ensure secure locking and easy folding
Data Source
AI summary
A stepladder includes a front section having a first front leg and a second front leg and a step attached to the first front leg and the second front leg and 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 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.