Patents by Inventor Gerhard Eberhahn

Gerhard Eberhahn 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).

  • Double chain stitch sewing machine having a looper and a looper thread spreader
    Patent number: 4974534
    Abstract: A sewing machine with a housing having a base over which the workpiece is movable and with a drive shaft is rotatable in the housing. A needle bar is provided having a plurality of needles and is connected to the drive shaft and moved upwardly and downwardly. A feed mechanism is provided for moving the workpiece. A looper support has a looper for each needle and is connected to the drive shaft for swinging movement. A loop spreader connecting rod has a loop spreader for each needle and is movable transversely to the movement of the needles. A spreader drive shaft is connected to the drive shaft and has a drive crank eccentric which is oscillated by the rotation of the spreader drive shaft. An eccentric arm carried by the crank eccentric is connected to a rocking shaft via a clamp lever and the rocking shaft is connected to a crank which is connected to the connecting rod which carries the spreaders.
    Type: Grant
    Filed: September 29, 1988
    Date of Patent: December 4, 1990
    Assignee: Pfaff Industriemaschinen GmbH
    Inventors: Gerhard Eberhahn, Ludwig Franz