Patents by Inventor Hans Pfab

Hans Pfab 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).

  • Housing for switchgears
    Patent number: 6583695
    Abstract: To reduce the rebound of the main armature with contact carrier in response to the switching operation of a contactor, magnetic-chamber base of contactor housing is provided with two support areas for the magnet yoke, said areas having different resiliencies. To this end, the magnetic-chamber base, designed so as to be capable of vibrating, has a supporting strip whose ends act as magnet-supporting areas.
    Type: Grant
    Filed: July 27, 1998
    Date of Patent: June 24, 2003
    Assignee: Siemens Aktiengesellschaft
    Inventors: Hans Pfab, Manfred Schmidt, Norbert Zimmermann, Norbert Sörgel, Peter Donhauser
  • Electromagnetic switching device
    Patent number: 6040750
    Abstract: A switching device is provided which includes a magnet system having a yoke which is elastically mounted by means of a volute spring. The volute spring permits the yoke to be displaced as far as closure of the magnet system. As a result, it is possible to prevent current overloading of the magnet system coil in the case of a welded break contact of the switching device.
    Type: Grant
    Filed: May 20, 1999
    Date of Patent: March 21, 2000
    Assignee: Siemens Aktiengesellschaft
    Inventor: Hans Pfab
  • Magnet damping arrangement
    Patent number: 6037852
    Abstract: An inexpensive and simple magnet damping arrangement, in particular for contactors with a.c. solenoids, is to be created. The non-switching magnet yoke of an electromagnet system with magnet coil is damped by a single damping compression spring which is supported on the bobbin of the magnet coil at one end and directly on the magnet yoke at the other end.
    Type: Grant
    Filed: August 28, 1998
    Date of Patent: March 14, 2000
    Assignee: Siemens AG
    Inventor: Hans Pfab
  • Electromagnetic switching device
    Patent number: 5959519
    Abstract: A switch device including an inner yoke and an outer yoke are arranged around the winding of an electromagnetic block, and a plate-shaped permanent magnet is inserted between the two yokes. A highly efficient actuation of the switching device is achieved by the assistance of the permanent magnet.
    Type: Grant
    Filed: August 28, 1998
    Date of Patent: September 28, 1999
    Assignee: Siemens AG
    Inventors: Ralph-Ronald Gobel, Norbert Sorgel, Hans Pfab