Patents Assigned to Harold R. Wing
  • Release mechanism for locking hinge for multi-positioned ladder
    Patent number: 4697305
    Abstract: An improved hinge for collapsible ladders which includes a depressable release mechanism operable by one hand, leaving the other hand free to make ladder adjustment. The improved hinge includes a guide shaft disposed within a tubular hub member which is journaled within hinge plates to which the ladder stringers are connected. A handle with locking pins is secured to one end of the guide shaft, with the other end of the guide shaft being secured to a depressable hinge release mechanism.
    Type: Grant
    Filed: November 21, 1986
    Date of Patent: October 6, 1987
    Assignee: Harold R. Wing
    Inventor: Lee H. Boothe