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Insulated Wire Abrasion Tester

IP.com Disclosure Number: IPCOM000091246D
Original Publication Date: 1967-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Johnston, LH: AUTHOR [+2]

Abstract

In testing the mechanical durability of insulation on very fine wire, such as wire finer than AWG 30, the wire may lack sufficient stiffness to withstand the incidental twisting forces to which it may be subjected in a conventional reciprocating tester.

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Insulated Wire Abrasion Tester

In testing the mechanical durability of insulation on very fine wire, such as wire finer than AWG 30, the wire may lack sufficient stiffness to withstand the incidental twisting forces to which it may be subjected in a conventional reciprocating tester.

This rotating tester provides a steady-state condition in which the forces on the wire under test are relatively constant and, therefore, the position of the wire is relatively stable. One end of wire 10 under test anchored at 12. Wire 10 passes over abrasion wheel 14 and is maintained in tension by a small weight 16 at its other end. Wheel 14 can consist of a drum of ground tool steel. Precision indicator 18 has anvil 20 which bears against wire 10 with controlled pressure. Indicator 18 has gauge 22 showing the movement of anvil 20 during the test.

Wheel 14 is driven counterclockwise by motor 24. When insulation on wire 10 is worn through by wheel 14, a circuit is completed from ground, through power source 26, relay coil 28, a connection to wire 10 at anchorage 12, wire 10, through the breach in the insulation on wire 10 to wheel 14, and thence to ground via contact 30. This energization of coil 28 opens contact 32 in the motor energizing circuit 34, thus stopping the test.

Counter 34 registers the number of revolutions of wheel 14 which the insulation on wire 10 withstands before failure. The reading of indicator 22 shows the displacement of anvil 20 during the test and thus the t...