Patents by Inventor Plamen D. Stoev

Plamen D. Stoev 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: 5038128
    Abstract: A magnetic gripper avoiding the disadvantages of the well-known devices of reduced lifting capacity, increased electric power consumption and small gripping force finds application in mechanical engineering for the transportation of ferromagnetic materials. The device has a U-shaped casing of magnetic soft material, at least two pairs of permanent magnets, one of their ends resting on the casing and the other on a common pole terminal enveloped in a neutralizing winding and all magnets are enveloped by a magnetizing winding. The magnetic gripper can lift thick sheets and packs of thin sheets when short-time current pulse of the magnetizing winding is fed and the permanent magnets are magnetized in one direction, the magnetic flux formed is collected in the common pole terminal. To free the sheets, a current pulse of the common neutralizing winding is fed and the direction of magnetization is reversed.
    Type: Grant
    Filed: July 11, 1989
    Date of Patent: August 6, 1991
    Assignee: P S P "Metalsnab"
    Inventors: Valentin G. Georgiev, Plamen D. Stoev, Zantcho B. Zanev, Stojan D. Stojanov, Assen G. Georgiev