Patents by Inventor Frank R. Albertsson

Frank R. Albertsson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Arrangement for handling a sewing machine
    Patent number: 4970978
    Abstract: The invention comprises an arrangement for controlling a machine by means of the body movement of the operator. It is used for controlling a sewing machine intended for a handicapped person or for an operator not using the foot control. A pulse (18) consisting of a number of periods of 40 kHz sound waves are emitted from a loud-speaker (15). The sound waves are reflected by the head of the operator and a digital circuit measures the time takes the sound pulse to return to the receiver (16). The distance measured to the head of the operator is then used to proportionally control the speed of the machines motor.
    Type: Grant
    Filed: March 15, 1989
    Date of Patent: November 20, 1990
    Assignee: Husqvarna Aktiebolag
    Inventor: Frank R. Albertsson