Sequential Release Mechanism for Locking Pliers
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Solution Overview
Problem
Some locking pliers require excessive force to lock and unlock the handles, making them difficult to use effectively.
Innovation Solution
A release mechanism featuring a center link and release link forming an over-center lock, with a release lever that sequentially acts on both elements to reduce the leverage required for unlocking, improving user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple release lever is used, then the device complexity is reduced, but excessive force is required to unlock the pliers
Solution Approach 1:
A release link is introduced as an intermediary component between the release lever and the center link. The release lever acts on the release link, which in turn acts on the center link, creating a mechanical advantage that reduces the force required to unlock the pliers while maintaining a relatively simple overall structure
Solution Approach 2:
The release mechanism is segmented into distinct functional components: the release lever for user input, the release link for force transmission and amplification, and the center link for locking/unlocking action. This segmentation allows each component to be optimized for its specific function while working together to reduce the overall force requirement
2Ease of operation
If the release lever directly acts on the center link, then the device complexity is minimized, but excessive force is required to release the lock
Solution Approach 1:
The release link serves as a mechanical intermediary that provides leverage multiplication. When the release lever is actuated, it applies force to the release link, which then applies amplified force to the center link, enabling easy unlocking without directly coupling the lever to the center link
3Reliability
If the abutment is always in contact with the protrusion, then the locking function is maintained, but the release operation cannot be initiated
Solution Approach 1:
The system transitions from a static locked state (abutment in contact with protrusion) to a dynamic release state when the release lever is actuated. The release link enables this transition by first allowing the abutment to lose contact with the protrusion, then facilitating the return to a new stable state, thus providing both reliable locking and easy release
Data Source
AI summary
Disclosed is a release mechanism for locking pliers. The mechanism includes a center link and release link that work together to form an over-center lock with a release lever that acts sequentially on the center link and release link. The release lever can first contact the center link at a protrusion, and then contact a release link connected to the center link to release the over-center lock. User experience is therefore improved by a sequential unlocking operation that reduces the amount of leverage required to unlock the pliers.