Plier Stripper for NM/3 Cable Sheath Removal
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Solution Overview
Problem
Existing stripper tools are not configured to efficiently remove the outer sheath from NM/3 cables, which have three insulated power conducting wires and a bare ground wire, unlike NM/2 cables.
Innovation Solution
A stripper tool design featuring a pair of lever members with jaws and blade sections that form a cable receiving opening, allowing for the cutting and removal of the outer sheath from round sheathed cables with three or more power conducting wires, including those with a bare ground wire, by pivoting and rotating to sever the sheath completely or partially.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing stripper tools are used on NM/3 cables, then the tool structure remains simple, but the tool cannot effectively strip the outer sheath from round sheathed cables with three or more power conducting wires
Solution Approach 1:
The stripper tool is divided into multiple jaw members (first jaw, second jaw, third jaw, fourth jaw) that can be independently positioned and configured. Each jaw can be adjusted to accommodate different cable configurations, allowing the tool to handle NM/3 cables with three insulated power conducting wires and a bare ground wire while maintaining manageable structural complexity through modular design
Solution Approach 2:
The stripper tool is designed with universal applicability to handle multiple cable types including NM/2 and NM/3 cables. The adjustable jaw configuration and cable receiving opening can adapt to different wire arrangements and sheath shapes, making a single tool versatile enough to strip various cable configurations without requiring multiple specialized tools
2Adaptability or versatility
If the stripper tool is designed to accommodate various wire arrangements and sheath shapes, then adaptability improves, but the device complexity increases
Solution Approach 1:
The stripper tool employs a nested arrangement where multiple jaws are positioned within a compact framework. The first and second jaws are arranged on one side of the cable receiving opening while the third and fourth jaws are positioned on the opposite side, creating a nested configuration that maximizes adaptability within a constrained structural footprint
Solution Approach 2:
The stripper tool incorporates movable and adjustable jaw members that can be repositioned to accommodate different cable configurations. The jaws can be adjusted to match various wire arrangements and sheath shapes, providing dynamic adaptability without requiring a completely different tool for each cable type
3Productivity
If the stripper tool uses cutting edges to sever the sheath, then stripping effectiveness improves, but the risk of electrical shorts increases if insulation is compromised
Solution Approach 1:
The stripper tool employs cutting edges with specific geometric configurations that concentrate cutting force locally on the sheath material. The cutting edges are positioned and angled to sever the sheath efficiently while minimizing contact with and damage to the insulated conductors, thereby maintaining local quality control to prevent electrical shorts
Solution Approach 2:
The insulated handles and jaw structures act as intermediary protective elements between the cutting edges and the conductors. These intermediaries provide mechanical support for the cutting action while electrically isolating the operator and protecting the conductors from accidental contact with cutting edges, reducing the risk of electrical shorts
Data Source
AI summary
A plier type stripper tool is provide for stripping sheathed cable of the type having a three spaced insulated power conducting wires, a ground wire disposed among the insulated wires and a sheath surrounding the wires. In one embodiment, the stripper tool includes a pair of levers having jaw, boss and handle portions. The stripper tool may further include a pivot joining the boss portions to enable relative movement of the levers about the pivot between open and closed portions. The jaw portions each have blade sections for coactively circumferentially cutting a cable sheath when the levers are moved from the open to the closed position. Each blade section has a set of three aligned cutting parts of a cutting edge, including a first cutting part disposed at an acute angle with respect to a longitudinal axis of the tool, a second cutting part disposed at an acute angle with respect to the longitudinal axis of the tool, and an arcuate cutting part disposed between the first cutting part and the second cutting part.