Wire-stripping pliers with forced lock mechanism
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Solution Overview
Problem
Existing wire-stripping and crimping pliers often experience unintentional opening during crimping, leading to incomplete compression of stranded cables, which can result in increased contact resistance due to corrosion and reduced current-carrying capacity, and may cause individual conductors to be sheared off or the ferrule to crack.
Innovation Solution
Integration of a forced lock mechanism with a pawl and toothed segment that prevents the pliers from opening without the ram engaging the ferrule, ensuring complete compression and tensile strength, while allowing for wire-stripping and twisting functions without functional restriction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a forced lock mechanism is integrated into wire-stripping and crimping pliers to prevent unintentional opening during crimping, then the reliability of the crimping process is improved, but the device complexity increases
Solution Approach 1:
The patent integrates the forced lock mechanism directly into the existing pliers structure by combining the pawl and toothed segment with the jaw assembly. The toothed segment is formed as an integral part of the movable jaw, and the pawl is mounted on the fixed jaw, merging the locking function with the existing structural elements rather than adding separate independent components.
Solution Approach 2:
The forced lock mechanism serves multiple functions: it prevents unintentional opening during crimping, ensures complete compression of the ferrule, and maintains consistent crimping force throughout the operation. The spring-loaded pawl provides both the locking action and the force necessary to keep the jaws engaged during the crimping process.
2Manufacturing precision
If the pliers are designed with a forced lock that prevents opening before complete crimping, then the connection quality is improved, but the ease of operation deteriorates
Solution Approach 1:
The pawl is designed to be spring-loaded rather than fixed, allowing it to dynamically engage and disengage from the toothed segment. The spring force automatically adjusts the pawl's position to maintain engagement during crimping, while allowing easy release when the crimping force is applied and the teeth are overcome.
3Ease of operation
If insufficient force is applied during crimping, then the ease of operation is improved, but the connection reliability deteriorates due to incomplete compression and corrosion
Solution Approach 1:
The forced lock mechanism is engaged before the crimping process begins, preventing any premature opening of the jaws. The spring-loaded pawl maintains continuous engagement throughout the crimping operation, ensuring that the full crimping force is applied without interruption or reduction, thereby guaranteeing complete compression of the ferrule and cable.
4Device complexity
If the pliers structure is simplified without a forced lock, then the device complexity is reduced, but the productivity decreases due to crimping errors and rework
Solution Approach 1:
The spring-loaded pawl automatically engages with the toothed segment when the jaws are closed, without requiring manual intervention. The mechanism self-activates based on the natural closing motion of the pliers, and the spring force automatically maintains engagement throughout the crimping process, eliminating the need for operator attention or adjustment.
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 forced lock mechanism reliably prevents unintentional opening, ensuring a gastight connection and maintaining tensile strength, reducing errors and saving working time by ensuring correct execution of the crimping process.
Implementation Method 1
The pawl (18) is mounted so as to be movable in a resilient manner by using a spring
Data Source
AI summary
Wire-stripping and crimping pliers twist a stranded cable end with bars projecting into a pliers mouth at free ends of pliers jaws and crimp a cable end region with a ferrule using a ram guided in a cassette in a pliers legs crossing region and running into a die due to a closing force upon pressing the legs together, to compress the ferrule in the die. First and second moldings on the jaws project into the mouth. A forced lock has a pawl and a toothed segment on the moldings preventing the pliers from opening without the ram previously running against the ferrule. The toothed segment on the first molding has a course corresponding to a movement curve of the jaws. The pawl on the second molding is movable by a spring but fixed in position. The first and/or second molding is formed in one piece with the bars.