Patents Assigned to Emil Freiwald
  • Foldable ladder
    Patent number: 4842099
    Abstract: A foldable ladder has collapsible crosspieces having a 90-degree pivot in the middle, the crosspieces being mounted to opposite side rails likewise having 90-degree pivots. Push rails are provided to the right and left of the crosspiece inside each sidepiece so as to move the ladder between folded and depolyed positions.
    Type: Grant
    Filed: December 10, 1987
    Date of Patent: June 27, 1989
    Assignee: Emil Freiwald
    Inventors: Dieter Collet, Emil Freiwald