Patents Assigned to Mechanical Backrest, Inc.
  • Mechanical backlift
    Patent number: 4853990
    Abstract: A person-raising device, designed for lifting a person in bed, rests atop a bed and is activated by a linear actuator comprising a dual-threaded lead screw and a small electric motor and gear reduction unit. The small electric motor and gear reduction unit drives the dual-threaded lead screw to raise a pair of support arms, which raises a person resting on the device. The lead screw is enclosed in a slotted tube; this decreases the chance of the lead screw coming into contact with a person using the device.
    Type: Grant
    Filed: February 3, 1989
    Date of Patent: August 8, 1989
    Assignee: Mechanical Backrest, Inc.
    Inventors: William H. Elder, Ries B. Hansen, Andre W. Olivier