Plunger Clamp Lever Lock for Balanced Linkage Forces
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Solution Overview
Problem
Traditional plunger clamps face issues with mechanical overstressing of linkages due to high force correlation, unbalanced forces on rivet connections, and lack of a positive lock to secure the lever handle in position, leading to potential unintended movement.
Innovation Solution
A plunger clamp design featuring a body with a bore, a pivotally connected lever, and a locking mechanism comprising a catch and latch mechanism with a biasing member to securely lock the plunger in both clamped and released positions, utilizing a pair of spaced arms and cutouts for precise alignment and force distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a traditional linkage design with rivets is used to connect plunger and lever, then the device can be manufactured with simple processes, but the rivets experience unbalanced forces and torqueing forces leading to increased stress and potential failure
Solution Approach 1:
The linkage connection is segmented into multiple attachment points (first and second attachment points on the lever, corresponding points on the plunger) rather than relying on single rivet connections. This distributes the mechanical loads across multiple locations, reducing stress concentration on individual connection points while maintaining manufacturing simplicity.
Solution Approach 2:
The patent combines multiple linkage members (first linkage member and second linkage member) into a unified structure that connects the plunger to the lever through distributed attachment points. This merged structure provides balanced force distribution and eliminates the torqueing forces that plagued the rivet-based single-point connections.
2Force
If the mechanical advantage of the plunger clamp is increased to provide greater clamping force, then the clamping capability is improved, but the linkage becomes overstressed during normal use
Solution Approach 1:
The linkage system is divided into multiple members (first and second linkage members) with distributed attachment points, allowing the high clamping forces to be segmented and distributed across multiple connection locations rather than concentrated in a single overloaded linkage member.
Solution Approach 2:
The patent transitions from a single-plane linkage design to a three-dimensional arrangement where linkage members extend in multiple directions from the lever. This spatial distribution in another dimension allows forces to be resolved across multiple axes, reducing stress on individual linkage components while maintaining high mechanical advantage.
3Device complexity
If no positive lock mechanism is provided, then the device structure remains simple, but the lever handle can be bumped or manipulated causing unintended movement of the plunger clamp
Solution Approach 1:
The linkage mechanism itself provides the locking function through its geometric configuration and force distribution characteristics. When the plunger reaches its clamped or released position, the linkage geometry naturally creates a stable equilibrium state that resists unintended movement, eliminating the need for separate positive lock mechanisms while maintaining structural simplicity.
Solution Approach 2:
The linkage members and attachment points are pre-configured in specific geometric relationships that create inherent stability at the clamped and released positions. This preliminary geometric arrangement ensures that when the plunger reaches these positions, the force vectors and structural geometry work together to prevent accidental movement without requiring additional locking components.
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 effectively reduces stress on components, provides a secure locking mechanism to prevent unintended movement, and ensures balanced force distribution, enhancing the mechanical stability and usability of the plunger clamp.
Implementation Method 1
A biasing member exerts a force on the latch mechanism to maintain the latch mechanism in the locked clamped and locked release positions
Data Source
AI summary
A plunger clamp has a body defining a bore with a plunger slidably held in the body bore. A lever is pivotally connected with the body. A link arm pivotally connects between the plunger and lever. A catch mechanism is coupled with the body. A latch mechanism is coupled with the lever. The catch mechanism and latch mechanism couple with one another to lock the plunger in a first clamped position and in a second released position.