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  1. #1
    Join Date
    Jan 2011
    Location
    Mid Michigan
    Posts
    136
    Country: United States

    Default Yale Bicentric padlock

    I wanted to reply/add to your point of information post Pete.

    "Point of Information-

    The Yale Bicentric cylinder was an early answer to avoiding the problem of key interchange for masterkeyed locks. Most pin tumbler masterkeyed locks use a "split-pin" system and as a result many unintended keys may operate the lock. As an example, a 6-pin cylinder with a single master key disc in all six chambers could be operated by 64 different keys! The Bicentric cylinder has two plugs, neither of which is masterkeyed. One, normally the upper plug, is controlled by the master key while the other plug, usually the lower one, is controlled by the change key. The lock can be operated by the use of either key in its own plug. Thus it is not dual custody in the sense that both keys would be needed to open the lock like a safety deposit box."
    Click image for larger version. 

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ID:	5654
    While the majority of these locks I see are opened by either key, they did make a dual custody configuration with 'guard' and 'change' cylinders. I've included a couple pictures of one I have. The guard key must first be turned before the change key will open, neither will open the lock by itself.
    Click image for larger version. 

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ID:	5653

  2. #2
    Join Date
    Oct 2010
    Location
    Tonawanda, NY, USA
    Posts
    704
    Country: United States

    Default

    Quote Originally Posted by bbcci View Post
    I wanted to reply/add to your point of information post Pete.

    Click image for larger version. 

Name:	duplex2a.JPG 
Views:	38 
Size:	111.6 KB 
ID:	5654
    While the majority of these locks I see are opened by either key, they did make a dual custody configuration with 'guard' and 'change' cylinders. I've included a couple pictures of one I have. The guard key must first be turned before the change key will open, neither will open the lock by itself.
    Click image for larger version. 

Name:	duplex1.JPG 
Views:	37 
Size:	38.6 KB 
ID:	5653

    Interesting, thanks for sharing. I wonder if that dual custody feature was available on mortise and/or rim cylinders as well?

    Pete Schifferli
    Tonawanda, NY

  3. #3
    Join Date
    Nov 2005
    Location
    Seattle WA
    Posts
    1,325
    Country: United States

    Default

    There are locks that require two keys. They are rare as I have only seen one in 22 years of working on locks. It was on a military base as that would be the place I would expect it.

  4. #4
    Join Date
    Jun 2008
    Location
    Temperance, Michigan USA
    Posts
    132
    Country: United States

    Default

    bbcci, is this padlock for sale/trade?

    Mike
    The Amazing Michael~Escape Artist/Scuba Diver/Locksmith/Lock, Handcuff, and Restraint Collector......and one HELL of a model American! =)

  5. #5
    Join Date
    Jan 2011
    Location
    Mid Michigan
    Posts
    136
    Country: United States

    Default

    Quote Originally Posted by amazing01 View Post
    bbcci, is this padlock for sale/trade?

    Mike

    Morning Mike, Not at the present time, but I will give you a heads up if that changes. I thought about it and you when I saw your wanted post.
    Bill

  6. #6
    Join Date
    Jun 2008
    Location
    Temperance, Michigan USA
    Posts
    132
    Country: United States

    Default

    Fair enough Bill. =)

    Mike
    The Amazing Michael~Escape Artist/Scuba Diver/Locksmith/Lock, Handcuff, and Restraint Collector......and one HELL of a model American! =)

  7. #7
    Join Date
    Jan 2013
    Posts
    464
    Country: United States

    Default Yale Bicentric Padlock

    I has for these lock on EBay to give you some idea of what it look like.
    Attached Thumbnails Attached Thumbnails Yale Bicentric Mortise Cylinder 1126 US!) 612 Discontinued Double Key MK Eaton ($10. 50) A.jpg   Yale Bicentric Mortise Cylinder 1126 US!) 612 Discontinued Double Key MK Eaton ($10. 50) B.jpg   Yale Bicentric Mortise Cylinder 1126 US!) 612 Discontinued Double Key MK Eaton ($10. 50) C.jpg   Yale Bicentric Mortise Cylinder 1126 US!) 612 Discontinued Double Key MK Eaton ($10. 50) D.jpg  

  8. #8
    Join Date
    Jan 2013
    Posts
    464
    Country: United States

    Default Yale Bicentric Padlock

    Sorry about the spelling as it should be that I found it on EBay. Price was about $10.50.

  9. #9
    Join Date
    Dec 2009
    Posts
    1,200
    Country: United States

    Default

    Can the mortise lock be field-configured to dual custody or was this a factory-only option?

  10. #10
    Join Date
    Jan 2013
    Posts
    464
    Country: United States

    Default Yale Bicentric Padlock

    They could be but not sure because I never seem these lock any where. I'm sure someone on this forum may know the answer.

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