Patents Assigned to Keycon Hardware Products, Inc.
  • Patent number: 4672827
    Abstract: A cylinder lock with a removable plug incorporates a series of spring biased combinating disc tumblers which cooperate with a first key in normal lock operation. An additional, unbiased control tumbler at the end of the plug cooperates with a retention flange associated with the cylinder to retain the plug against removal from the cylinder while permitting rotation of the plug in the cylinder. The control tumbler includes a notch for receipt of the first key as well as a second, plug removal key. The first key acts against one edge of the notch to displace the control tumbler into a position which ensures that the tumbler will remain engaged with the plug retention flange regardless of the orientation of the plug.
    Type: Grant
    Filed: November 8, 1984
    Date of Patent: June 16, 1987
    Assignee: Keycon Hardware Products, Inc.
    Inventor: Clark E. Craig