Patents Assigned to Simplex Security Systems, Inc.
  • Door locking system
    Patent number: 4637237
    Abstract: A combination lock system on a narrow stile door having selective operation through a drive mechanism including a slide for retraction of the latch bolt operated by the combination lock and a manual control or key operation of the latch bolt. The key operation provides an override of the combination lock operation.
    Type: Grant
    Filed: September 27, 1985
    Date of Patent: January 20, 1987
    Assignee: Simplex Security Systems, Inc.
    Inventors: Edward J. Witkoski, Edgar G. Lizotte