Patents by Inventor Leif Gerlach

Leif Gerlach 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).

  • Patent number: 4470360
    Abstract: A quilting machine employs bobbin holders which support bobbins each having a conical lower portion ending in a point. A plurality of hooks are driven in an eliptical path to engage and pull down a loop of thread formed by insertion of a needle through a needle plate and the partial withdrawal thereof. The hooks keep the loop open and pull it down so that it passes over the pointed lower end of the bobbin. In order to facilitate engagement of the loop over the bobbin, the bobbins are maintained in sloped fashion. A thread take-up mechanism pulls up the loop of thread with one of the strands of the loop passing behind the bobbin between the bobbin and the bobbin holder to form a lock stitch.
    Type: Grant
    Filed: December 6, 1982
    Date of Patent: September 11, 1984
    Inventor: Leif Gerlach