Patents Assigned to Charles A. McDonnell
  • Collapsible ladder
    Patent number: 5495915
    Abstract: A collapsible ladder comprises telescopically collapsible sections, and latch mechanisms in each of the rungs for automatically locking the sections relative to one another when the sections are extended. The latch mechanisms are arranged to release the sections when a rung is collaped against the next lower rung.
    Type: Grant
    Filed: December 29, 1994
    Date of Patent: March 5, 1996
    Assignees: Charles A. McDonnell, Fergus R. Fitzgerald
    Inventors: James T. Weston, Richard Weston