Pliers Jaw Teeth Angle Design for Slipping Prevention
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Solution Overview
Problem
Conventional pliers fail to maintain efficient engagement of locking teeth with workpieces at larger swinging angles, leading to slipping and inconvenience during operation.
Innovation Solution
The design of pliers with locking teeth on the fixed jaw and engaging teeth on the movable jaw features obtuse angles, specifically between 90° to 92° and 93° to 97° respectively, and included angles between 134° to 136° between the lines passing the engaging teeth, enhancing friction and clamping force to prevent slipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the swinging angle of the movable jaw is increased to accommodate larger workpieces, then the adaptability of the pliers is improved, but the engagement efficiency of the locking teeth and engaging teeth deteriorates, causing the workpiece to slip
Solution Approach 1:
The patent changes the geometric parameters of the teeth by specifying precise angle ranges: locking teeth angles between 90°-92°, first engaging teeth angles between 93°-97°, and second engaging teeth angles between 93°-97°. These parameter optimizations ensure that the contact points maintain appropriate friction angles (37°-45°) even when the movable jaw swings to larger angles, thereby maintaining reliable engagement across a wider range of workpiece sizes
2Strength
If the angle of locking teeth and engaging teeth is made obtuse (between 90°-97°) to enhance strength, then the strength of the teeth is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise angle ranges (90°-92° for locking teeth, 93°-97° for engaging teeth) that balance strength requirements with manufacturability. These ranges are narrow enough to ensure adequate strength through obtuse angles but wide enough to accommodate normal manufacturing tolerances, making the design both strong and manufacturable
3Force
If the included angle between lines passing through engaging teeth apexes is increased to 134°-136° to enhance clamping force, then the clamping force is improved, but the device complexity increases
Solution Approach 1:
The patent optimizes the included angle between lines L1 and L2 (passing through apexes of first and second engaging teeth) to be 134°-136°. This specific parameter range maximizes the clamping force by creating optimal friction angles at the contact points with the workpiece, while maintaining a relatively simple jaw structure without additional 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 enhanced friction and clamping force ensure the workpiece is securely held, reducing the likelihood of slipping and improving operational reliability by maintaining a strong grip even at larger angles.
Implementation Method 1
the first contact point of the locking teeth of the fixed jaw and the second contact point of the first engaging teeth of the first toothed face of the movable jaw have a larger friction with the surface of the workpiece by the special angle design of the fixed jaw and the movable jaw to enhance the clamping force
Data Source
AI summary
A pair of pliers include a shank, a fixed jaw locked onto the shank, and a movable jaw pivotally mounted on the shank and movable relative to the fixed jaw. Thus, the first contact point of the locking teeth of the fixed jaw and the second contact point of the first engaging teeth of the first toothed face of the movable jaw have a larger friction with a workpiece by a special angle design of the fixed jaw and the movable jaw to enhance the clamping force of the fixed jaw and the movable jaw on the workpiece, so that the workpiece is clamped by the fixed jaw and the movable jaw exactly and closely to prevent the workpiece from being slipped from the fixed jaw and the movable jaw during operation of the pliers.