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OR interlocking

 
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wain77



Joined: 31 Dec 2012
Posts: 1

PostPosted: Tue Jan 01, 2013 10:02 pm    Post subject: OR interlocking Reply with quote

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

Code:
1N;2R|3R


be effectively implemented in an interlocking as

Code:
1N;(3N)2R
1N;(2N)3R


I know you can't notify it as

Code:
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


Joined: 15 Jan 2004
Posts: 283
Location: Australia

PostPosted: Wed Jan 02, 2013 5:20 am    Post subject: Reply with quote

wain77,

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

Code:
 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:

Code:
1N;(3N)2R
1N;(2N)3R
1N;2B,3B

... but this takes up more locking bed real estate when implemented.
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