Patents by Inventor Stefan Walkowiak

Stefan Walkowiak 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).

  • Door sensor beam
    Patent number: 5712458
    Abstract: An assembly for a no-contact power reversing system for an elevator car gate comprises a lost-motion linkage comprising inner and outer telescoping members, the inner member having an upper extension which stabilizes and protects the electrical cable leading to the scanner unit of the device during retraction and extension of the scanner unit mounting as the gate approaches and leaves full closed position. The linkage and associated parts mounted in such a way that the scanner unit is protected against pilferage.
    Type: Grant
    Filed: August 9, 1995
    Date of Patent: January 27, 1998
    Assignee: The Peelle Company
    Inventors: Shan H. McCandless, Stefan Walkowiak
  • Pass door fire lintel
    Patent number: 5377784
    Abstract: A fire lintel for a freight elevator pass door that provides a fire stop in the gap between the door opening header and the upper panel of the pass door and that is displaceable for passage of the door above into the gap when the door above opens. Two embodiments of the fire lintel are characterized by overlapping baffle-like elements that afford a high resistance to the passage of gases into the hoistway in the event of a fire.
    Type: Grant
    Filed: September 8, 1993
    Date of Patent: January 3, 1995
    Assignee: The Peelle Company
    Inventors: Stefan Walkowiak, Stephen Petrovich, Herman Reis
  • Car gate reversing edge
    Patent number: 4984658
    Abstract: The invention provides a scanning beam along the forward edge of an elevator car closure which leads the edge a predetermined distance to provide sufficient time when an object interrupts the beam to stop or reverse the closure and which retracts relative to the closure during final closing movement to dwell adjacent the line at which the closure forward edge closes.
    Type: Grant
    Filed: January 22, 1990
    Date of Patent: January 15, 1991
    Assignee: The Peelle Company
    Inventors: H. E. Peelle, Jr., I-Lin Chang, Stefan Walkowiak