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Testing Device for DPDT Switches

IP.com Disclosure Number: IPCOM000094715D
Original Publication Date: 1965-May-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Keller, RJ: AUTHOR

Abstract

Toggle lever 2 of double-pole, double-throw switch 1, to be tested, is repetitively actuated by oscillating lever arm 3 and connecting link 4. Arm 3 is driven by motor 6 and appropriate linkage mechanism. As 3 oscillates, its upper end intermittently closes switches 8, 9 and 10. These connect relay coils R1 and R2 in series with energizing voltage source 7. Switches 8 and 10 cause R1 to be energized when 2 is moved to the left and right switch-on positions, when the contacts of 1 should be closed. Switch 9 energizes R2 when 2 is in its vertical center-off position, when the contacts of 1 should be open. R1 and R2 actuate contact points in a failure detection circuit to which the terminals of 1 are connected via leads 5.

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Testing Device for DPDT Switches

Toggle lever 2 of double-pole, double-throw switch 1, to be tested, is repetitively actuated by oscillating lever arm 3 and connecting link 4. Arm 3 is driven by motor 6 and appropriate linkage mechanism. As 3 oscillates, its upper end intermittently closes switches 8, 9 and 10. These connect relay coils R1 and R2 in series with energizing voltage source 7. Switches 8 and 10 cause R1 to be energized when 2 is moved to the left and right switch-on positions, when the contacts of 1 should be closed. Switch 9 energizes R2 when 2 is in its vertical center-off position, when the contacts of 1 should be open. R1 and R2 actuate contact points in a failure detection circuit to which the terminals of 1 are connected via leads 5.

In the failure detection circuit, the contacts of 1, when closed, are placed in series between voltage source V1 and Exclusive Or 14 by contact points R1-1 or R1-2 and R1-3. R1-4 connects V2 to counter 17 and to the second input of 14. Should either of the contacts of 1 fail to close, 14 issues a pulse which steps counter 18. This thus registers the total number of times that the contacts fail to make. Counter 17 registers the total number of times that toggle 2 is moved to the switch-on position, i.e., the total make cycles.

When the contacts of 1 are moved to the center-off position, the four circuit poles of 1 are connected in parallel by R2-1, R2-2, R2-3 and R2-4 with one input of And 13. At the same time, V1 a...