Patent ID: 6021567
Filing Date: 2000-02-08
Classification: H01R,Y10T

Abstract:
A method for producing an insulation displacement terminal, which has an insulation displacement blade provided with a slot, in accordance with an insulation sheath electrical cable being worked, comprising:arranging a pair of metal blocks in parallel to each other so that the opposed side edges of said blocks can be resiliently spaced apart from each other, each metal block having a tapered portion provided at an end of said side edge;measuring an extent of insertion of said cable, a distance between said spaced metal blocks, a reaction force acting between said cable and said spaced metal blocks, and a contact resistance acting between said cable and said spaced metal blocks while inserting said cable into a gap between said spaced metal blocks from the side of said tapered portions;extracting data on an extent of the insertion, a spaced distance, a reaction force, and a contact resistance after completing the insertion out of data measured from the time when the insertion of said cable started to the time when said contact resistance is settled at the lowest level;judging whether or not conductive wires of said cable are broken;repeating the cable insertion, measurement, data extraction, and judgment of wire breakage while changing an initial gap between said spaced metal blocks;setting a range, in which the contact resistance after completing the insertion becomes stable and the breakage of wires is not caused, to be an allowable range out of a variable range of the gap between said spaced metal blocks after completing the insertion in accordance with a relationship among the gap between said spaced metal blocks, reaction force, and the contact resistance after completing the insertion in the case of changing the initial gap between said spaced metal blocks;determining a design value of a gap between said spaced metal blocks after completing the insertion within said allowable range;determining design values of a reaction force and an extent of insertion after completing the insertion in correspondence with said design value of the gap;obtaining a displacement-reaction force characteristic in accordance with said design values, said characteristic being indicative of the reaction force corresponding to a design value of said reaction force after completing the insertion when the slot width is increased to the design value of the gap after completing the insertion at a position where a distance from a distal end of a slot in said terminal becomes the design value of the extent of the insertion after completing the insertion;whereby the respective dimensions of said insulation displacement terminal are determined.