Patents by Inventor Helmut Stolpmann

Helmut Stolpmann 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).

  • Publication number: 20110037341
    Abstract: The invention relates to a commutator (1) comprising electrically conductive commutator segments (12), which are disposed about a rotational axis (10) in a manner free of a pressing material body, and which are electrically insulated from each other by means of an air gap (14) disposed between two adjacent commutator segments (12), characterized in that a fixing means (42) applied to the commutator (1) in a flowable phase in a form-free manner is cured after a flow process between two commutator segments (12) adjoining in the circumferential direction about the rotational axis (10), and that the position of the commutator segments (12) is fixed by the cured fixing means (42), and to a power tool having an electric motor comprising such a commutator, and to a method for the production of a commutator.
    Type: Application
    Filed: February 11, 2009
    Publication date: February 17, 2011
    Inventors: Michael Schmohl, Helmut Stolpmann
  • Patent number: 5760517
    Abstract: In the case of a plug-in commutator with a hub body (1) consisting of an electrical isolation material and having evenly distributed and positioned grooves of like design over its circumference, in which each of the segments (5)--of like design--which form the commutator path, is inserted by forming a form-fit connection in radial direction, the segments (5) are safeguarded from a shift in relation to the hub body (1) by a clamping force that is based on an overdimension (x, z) of the segments (5) and/or of material parts of the hub body (1) that facilitate the positioning of the segments (5). Only in the area of the two end sections (18, 21) of the segments (5) and/or the grooves is the overdimension (x, z), which determines the clamping force exerted on the segments (5), provided.
    Type: Grant
    Filed: June 6, 1997
    Date of Patent: June 2, 1998
    Assignee: Kirkwood Industries, GmbH
    Inventor: Helmut Stolpmann