Patents by Inventor Christof Hoelzl

Christof Hoelzl 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: 8608530
    Abstract: The present invention is directed to an insertion tool (12) for a machine tool that has a hub (16) with at least one opening (42, 80) for insertion of a fastening means (40, 84), via which the hub (16) is clampable on a driving flange (22) of the machine tool connected to a drive shaft, the opening (42, 80) including a retaining region (54) and a releasing region (56), the releasing region (56) including a stop (66, 88) for limiting a release motion of the fastening means (40, 84). It is provided that the opening (42, 80) adjacent to the stop (66, 88) has a convex section (76, 90).
    Type: Grant
    Filed: November 8, 2004
    Date of Patent: December 17, 2013
    Assignee: Robert Bosch GmbH
    Inventors: Albrecht Hofmann, Harald Krondorfer, Thomas Schomisch, Christof Hoelzl, Johann Huber, Kersten Heckmann
  • Patent number: 7739932
    Abstract: A tool-holding device for an insert tool (14) equipped with an at least essentially disk-shaped hub (42), in particular for a hand-guided angle grinder (32) or a hand-guided circular saw, having a drive device (12) that includes a leaf spring unit (58) and is able to clamp the insert tool (14) in the axial direction (64). The leaf spring unit (58) has at least one freely extending spring piece (110) that extends at least partially in the circumference direction (50, 52).
    Type: Grant
    Filed: September 24, 2004
    Date of Patent: June 22, 2010
    Assignee: Robert Bosch GmbH
    Inventors: Ernst Kraenzler, Peter Stierle, Albrecht Hofmann, Juergen Wiker, Harald Krondorfer, Joachim Schadow, Sinisa Andrasic, Thomas Schomisch, Christof Hoelzl, Johann Huber, Marcus Heckmann, Kirsten Heckmann, legal representative
  • Patent number: 7722445
    Abstract: An insertion tool (12) for an angle grinder (2) that has a hub (16) with at least a first fastening means for fastening the hub (16) to a driving device (22) of the angle grinder (2). The first fastening means if located on a partial circle (54) with a radius (56) of between 12 mm and 25 mm.
    Type: Grant
    Filed: November 9, 2004
    Date of Patent: May 25, 2010
    Assignee: Robert Bosch GmbH
    Inventors: Ernst Kraenzler, Peter Stierle, Albrecht Hofmann, Juergen Wiker, Harald Krondorfer, Joachim Schadow, Sinisa Andrasic, Thomas Schomisch, Christof Hoelzl, Johann Huber
  • Publication number: 20070272064
    Abstract: A tool-holding device for an insert tool (14) equipped with an at least essentially disk-shaped hub (42), in particular for a hand-guided angle grinder (32) or a hand-guided circular saw, having a drive device (12) that includes a leaf spring unit (58) and is able to clamp the insert tool (14) in the axial direction (64). The leaf spring unit (58) has at least one freely extending spring piece (110) that extends at least partially in the circumference direction (50, 52).
    Type: Application
    Filed: September 24, 2004
    Publication date: November 29, 2007
    Inventors: Ernst Kraenzler, Peter Stierle, Albrecht Hofmann, Harald Krondorfer, Joachim Schadow, Thomas Schomisch, Christof Hoelzl, Johann Huber
  • Publication number: 20070060029
    Abstract: The present invention is directed to an insertion tool (12) for an angle grinder (2) that has a hub (16) with at least a first fastening means for fastening the hub (16) to a driving device (22) of the angle grinder (2). It is provided that the first fastening means is located on a partial circle (54) with a radius (56) between 12 mm and 25 mm.
    Type: Application
    Filed: November 9, 2004
    Publication date: March 15, 2007
    Inventors: Ernst Kraenzler, Peter Stierle, Albrecht Hofmann, Juergen Wiker, Harald Krondorfer, Joachim Shadow, Sinisa Andrasic, Thomas Schomisch, Christof Hoelzl, Johann Huber
  • Patent number: 7097548
    Abstract: The invention is based on an insertable tool with a rotationally driven disk-shaped hub (10, 12), to which a grinding means (14) is secured in the radially outer region. It is proposed that the hub (10, 12) is embodied with a flexural strength that varies in the radial direction.
    Type: Grant
    Filed: December 14, 2001
    Date of Patent: August 29, 2006
    Assignees: Robert Bosch GmbH, Tyrolit Schleifmittel Swarovski K.G.
    Inventors: Harald Krondorfer, Markus Heckmann, Joachim Schadow, Christof Hoelzl, Johann Huber, Wilhelm Schulze
  • Publication number: 20060172668
    Abstract: The present invention is directed to an insertion tool (12) for a machine tool that has a hub (16) with at least one opening (42, 80) for insertion of a fastening means (40, 84), via which the hub (16) is clampable on a driving flange (22) of the machine tool connected to a drive shaft, the opening (42, 80) including a retaining region (54) and a releasing region (56), the releasing region (56) including a stop (66, 88) for limiting a release motion of the fastening means (40, 84). It is provided that the opening (42, 80) adjacent to the stop (66, 88) has a convex section (76, 90).
    Type: Application
    Filed: November 8, 2004
    Publication date: August 3, 2006
    Inventors: Albercht Hofmann, Harald Krondorfer, Thomas Schomisch, Christof Hoelzl, Johann Huber, Marcus Heckmann
  • Patent number: 6902471
    Abstract: The invention is based on an insertable tool having a rotationally drivable, disk-shaped hub (10, 12), on which a grinding means (14) forming a cutoff disk, grinding disk, roughing disk, or abrasive disk is secured in the radially outer region. It is proposed that the grinding means (14) and the hub (10, 12) are joined via joining means (26) in the manner of a positive connection at least in the direction of rotation.
    Type: Grant
    Filed: January 23, 2002
    Date of Patent: June 7, 2005
    Assignees: Robert Bosch GmbH, Tyrolit Schleifmittelwerke Swarovski K.G.
    Inventors: Harald Krondorfer, Markus Heckmann, Joachim Schadow, Christof Hoelzl, Johann Huber, Wilhelm Schulze
  • Patent number: 6869346
    Abstract: The invention is based on a tool receiver for a grinder, in particular for a handheld angle grinder (10), having a carrier device (12, 14, 16, 182, 184, 300), via which an application tool (18, 32, 186, 188) can be actively connected to a drive shaft (54). It is proposed that the application tool (18, 32, 186, 188) be actively connectable to the carrier device (14, 16, 182, 184) via at least one detent element (24, 26, 190, 192, 194, 196, 198, 200, 302) movable against a spring force that snaps into place in an operating position of the application tool (18, 32, 186, 188) and immobilizes the application tool (18, 32, 186, 188) with positive engagement.
    Type: Grant
    Filed: March 31, 2001
    Date of Patent: March 22, 2005
    Assignees: Robert Bosch GmbH, Tyrolit Schleifmittel Swarovski K.G.
    Inventors: Dieter Wendt, Harald Krondorfer, Ralph Dammertz, Markus Heckmann, Joachim Schadow, Thomas Schomisch, Marco Brancato, Christof Hoelzl, Johann Huber, Wilhelm Schulze
  • Patent number: 6786811
    Abstract: A grinding machine tool receptacle for a hand-guided angle grinding machine has a slaving device by which an insert tool is operatively connectable to a drive shaft, the insert tool is operatively connectable to the slaving device via at least one detent element supported movably counter to a spring element, which detent element snaps into place in an operating position of the insert tool driven by the spring element and fixes the insert tool by positive engagement, the detent element is displaceable in the axial direction counter to the spring element, and the insert tool is connected to the slaving device in the circumferential direction via at least a first element and in the axial direction via at least a second element, with the second element arranged for fixing of the insert tool with a spring force.
    Type: Grant
    Filed: February 20, 2002
    Date of Patent: September 7, 2004
    Assignees: Robert Bosch GmbH, Tyrolit Schleifmittel Swarovski K.G.
    Inventors: Harald Krondorfer, Ralph Dammertz, Zaal-Azhar Alias, Markus Heckmann, Joachim Schadow, Thomas Schomisch, Marco Brancato, Christof Hoelzl, Johann Huber, Wilhelm Schulze
  • Publication number: 20030176153
    Abstract: The invention is based on an insertable tool having a rotationally drivable, disk-shaped hub (10, 12), on which a grinding means (14) forming a cutoff disk, grinding disk, roughing disk, or abrasive disk is secured in the radially outer region.
    Type: Application
    Filed: April 21, 2003
    Publication date: September 18, 2003
    Inventors: Harald Krondorfer, Markus Heckmann, Joachim Schadow, Christof Hoelzl, Johan Huber, Wilhelm Schulze
  • Publication number: 20030162487
    Abstract: The invention is based on an insertable tool with a rotationally driven disk-shaped hub (10, 12), to which a grinding means (14) is secured in the radially outer region.
    Type: Application
    Filed: March 19, 2003
    Publication date: August 28, 2003
    Inventors: Harald Krondorfer, Markus Heckmann, Joachim Schadow, Christof Hoelzl, Johann Huber, Wilhelm Schulze
  • Publication number: 20030129933
    Abstract: The invention is based on a tool receiver for a grinder, in particular for a handheld angle grinder (10), having a carrier device (12, 14, 16, 182, 184, 300), via which an application tool (18, 32, 186, 188) can be actively connected to a drive shaft (54).
    Type: Application
    Filed: March 1, 2002
    Publication date: July 10, 2003
    Inventors: Dieter Wendt, Harald Krondorfer, Ralph Dammertz, Markus Heckmann, Joachim Schadow, Thomas Schomisch, Marco Brancato, Christof Hoelzl, Johann Huber, Wilhelm Schulze
  • Publication number: 20030104773
    Abstract: The invention is based on a grinding machine tool receptacle, in particular for a hand-guided angle grinding machine (10), having a slaving device (12, 14, 16, 300), by way of which an insert tool (18, 32) can be operatively connected to a drive shaft (54).
    Type: Application
    Filed: February 20, 2002
    Publication date: June 5, 2003
    Inventors: Harald Krondorfer, Ralph Dammertz, Zaal-Azhar Alias, Markus Heckmann, Joachim Schadow, Thomas Schomisch, Marco Brancato, Christof Hoelzl, Johann Huber, Wilhelm Schulze