OR interlocking

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wain77
Posts: 1
Joined: Mon Dec 31, 2012 5:33 am

OR interlocking

Post by wain77 »

Can I ask how the OR interlocking would actually be implemented? For example, in .itf notation, could

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1N;2R|3R
be effectively implemented in an interlocking as

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1N;(3N)2R
1N;(2N)3R
I know you can't notify it as

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1N;2R,3N
1N;2N,3R
cos you end up locking the lever permanently.

This is purely for satisfying my intellectual curiosity. Thanks in advance!

Sam
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modadmin
Site Admin
Posts: 290
Joined: Thu Jan 15, 2004 9:41 am
Location: Australia

Post by modadmin »

wain77,

Those two are not equivalent. The possibilities with 1N;2R|3R are as follows (F=free; L=locked; X=either N or R):

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 1  2  3
NL NF NF
NF RF NF
NF NF RF
NF RF RF
RF XL XL
To create logical equivalence, you could use:

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1N;(3N)2R 
1N;(2N)3R
1N;2B,3B
... but this takes up more locking bed real estate when implemented.
All the best from "modadmin"
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