Patents by Inventor Albrecht Hofmann

Albrecht Hofmann 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: 8167689
    Abstract: The invention is based on a system with a tool-holding fixture, which fixture has a slaving device (12) by way of which an inserted tool (14) can be connected operatively to a drive shaft (16), and with an inserted tool (14) which can be connected operatively to the slaving device (12) via at least one detent element (20) that is supported movably counter to a spring element (18), which detent element snaps into place in an operating position of the inserted tool (14) and fixes the inserted tool (14) by positive engagement. It is proposed that the tool-holding fixture and the inserted tool (14) have at least two corresponding shaped elements (22, 24), adapted to one another, to facilitate installation of the inserted tool (14).
    Type: Grant
    Filed: April 2, 2003
    Date of Patent: May 1, 2012
    Assignees: Robert Bosch GmbH, Tyrolit Schleigmitel Swarowski K.G.
    Inventors: Albrecht Hofmann, Harald Krondorfer, Markus Heckmann, Thomas Schomisch
  • Patent number: 8096857
    Abstract: A power tool, in particular a right-angle grinder, includes a motor and a gear, the motor and/or the gear embodied as a mountable function module. The gear is embodied as a mountable function module, with a gear input shaft supported in a gearbox, and the gear input shaft is fixed in the gearbox via at least one detent connection.
    Type: Grant
    Filed: June 6, 2003
    Date of Patent: January 17, 2012
    Assignee: Robert Bosch GmbH
    Inventors: Albrecht Hofmann, Harald Krondorfer, Markus Heckmann, Kersten Heckmann, legal representative, Thomas Schomisch
  • Patent number: 7967079
    Abstract: A portable power tool includes a motor housing (22a, 22b, 22c, 22d, 68) and a housing cover (26a, 26b, 26c, 26d, 72) that is attached to the motor housing (22a, 22b, 22c, 22d, 68). The portable power tool includes insulation (44a, 44b, 44c, 44d, 70a, 70b) adjacent to the motor housing (22a, 22b, 22c, 22d, 68) and the housing cover (26a, 26b, 26c, 26d, 72), which are guided through a guide (50a, 50b, 50c, 50d, 52a, 52b, 52d, 92) in the direction toward the motor housing (22a, 22b, 22c, 22d, 68) and/or the housing cover (26a, 26b, 26c, 26d, 72).
    Type: Grant
    Filed: February 13, 2006
    Date of Patent: June 28, 2011
    Assignee: Robert Bosch GmbH
    Inventors: Peter Stierle, Albrecht Hofmann, Juergen Wiker, Mario Pauli, Stefan Heess, Thomas Schomisch, Meinhard Eule, Markus Heckmann, Kersten Heckmann, legal representative
  • Publication number: 20110097978
    Abstract: The invention is based on a system with a tool-holding fixture, which fixture has a slaving device (12) by way of which an inserted tool (14) can be connected operatively to a drive shaft (16), and with an inserted tool (14) which can be connected operatively to the slaving device (12) via at least one detent element (20) that is supported movably counter to a spring element (18), which detent element snaps into place in an operating position of the inserted tool (14) and fixes the inserted tool (14) by positive engagement. It is proposed that the tool-holding fixture and the inserted tool (14) have at least two corresponding shaped elements (22, 24), adapted to one another, to facilitate installation of the inserted tool (14).
    Type: Application
    Filed: April 2, 2003
    Publication date: April 28, 2011
    Inventors: Albrecht Hofmann, Harald Krondorfer, Markus Heckmann
  • Publication number: 20110012446
    Abstract: In an electric machine tool with a commutator motor which has a motor shaft which is arranged rotatably in a motor housing and has a commutator, at least two commutator brushes are assigned which are accessible via at least one brush cover provided on the motor housing. A covering element fixes the brush cover on the motor housing in an operating position in which the commutator brushes are covered. The covering element in turn is fastened on the motor housing via a detachable connection.
    Type: Application
    Filed: December 18, 2008
    Publication date: January 20, 2011
    Inventors: Joerg Maute, Florian Esenwein, Albrecht Hofmann, Thomas Schomisch
  • Patent number: 7828185
    Abstract: The invention relates to a hand power tool (2), having a housing (6), an electric motor accommodated in the housing (6), and a battery pack (4), releasably locked to the housing (6), for supplying the electric motor with electric current. At least one spring/damping element (38), mounted between the battery pack (4) and the housing (6) of the hand power tool (2), is provided, for damping vibration and -or eliminating a locking-dictated play between the battery pack (4) and the housing (6).
    Type: Grant
    Filed: December 11, 2003
    Date of Patent: November 9, 2010
    Assignee: Robert Bosch GmbH
    Inventors: Albrecht Hofmann, Harald Krondorfer, Markus Heckmann, Kersten Heckmann, legal representative, Joachim Schadow, Thomas Schomisch
  • Publication number: 20100258327
    Abstract: The invention relates to an electrically driven hand-held power tool having a drive motor that is configured as a commutator motor having a brush for current transfer to the commutator. A removable cover is received in the housing that is the carrier of a spring element, which exerts a spring force in the mounted state on the brush in the direction of the commutator.
    Type: Application
    Filed: September 29, 2008
    Publication date: October 14, 2010
    Inventors: Florian Esenwein, Albrecht Hofmann
  • Patent number: 7767918
    Abstract: A power tool has a power supply unit that can be removed on a device side for supplying electrical power, at least one indirectly actuatable switch for switching a drive machine on and off, a decoupling device for decoupling the switch, and a switching unit that actuates the switch at least indirectly.
    Type: Grant
    Filed: November 8, 2004
    Date of Patent: August 3, 2010
    Assignee: Robert Bosch GmbH
    Inventors: Albrecht Hofmann, Harald Krondorfer, Thomas Schomisch
  • 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
  • Patent number: 7628683
    Abstract: A handheld power tool has a housing, a rotating cutting tool having a clamping neck structurally connected to the housing, a guard hood that covers the cutting tool and has a guard hood part and a slip-on ring for receiving the guard hood releasably and adjustably on the clamping neck, the slip-on ring being connected to the guard hood part and having detent means for axially securing the slip-on ring to the clamping neck, and additional torsion-prevention means configured as a stop flange provided on the guard hood, the flange being provided in addition to the slip-on ring and connected to the guard hood part so that, in an installed state the stop flange is in contact with a component of the power tool that is structurally connected to the housing.
    Type: Grant
    Filed: December 7, 2006
    Date of Patent: December 8, 2009
    Assignee: Robert Bosch GmbH
    Inventors: Albrecht Hofmann, Thomas Schomisch, Ralf Bocka
  • Patent number: 7497766
    Abstract: A tool-handling 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 shaft (16) and a drive device (12) equipped with at least one locking element(20) that is supported so that it is able to move in relation to a spring element (18) in order to fix the insert tool (14) in a form-locked manner in the circumference direction (50, 52). The drive shaft (16) has at least one form-locking element (100) formed onto it in a non-cutting manner in order to connect it in a form-locked manner in the circumference direction (50, 52) to a drive torque-transmitting mechanism of the drive device (12).
    Type: Grant
    Filed: September 24, 2004
    Date of Patent: March 3, 2009
    Assignee: Robert Bosch GmbH
    Inventors: Ernst Kraenzler, Peter Stierle, Albrecht Hofmann, Juergen Wiker, Harald Krondorfer, Joachim Schadow, Sinisa Andrasic, Thomas Schomisch
  • Publication number: 20080202784
    Abstract: The present invention relates to a portable power tool with a motor housing (22a, 22b, 22c, 22d, 68) and a housing cover (26a, 26b, 26c, 26d, 72) that is attached to the motor housing (22a, 22b, 22c, 22d, 68). It is provided that the portable power tool includes insulation means (44a, 44b, 44c, 44d, 70a, 70b) adjacent to the motor housing (22a, 22b, 22c, 22d, 68) and the housing cover (26a, 26b, 26c, 26d, 72), which are guided through a guide means (50a, 50b, 50c, 50d, 52a, 52b, 52d, 92) in the direction toward the motor housing (22a, 22b, 22c, 22d, 68) and/or the housing cover (26a, 26b, 26c, 26d, 72).
    Type: Application
    Filed: February 13, 2006
    Publication date: August 28, 2008
    Inventors: Peter Stierle, Albrecht Hofmann, Juergen Wiker, Mario Pauli, Stefan Heess, Thomas Schomisch, Meinhard Eule
  • Publication number: 20080099224
    Abstract: The invention relates to a hand power tool (2), having a housing (6), an electric motor accommodated in the housing (6), and a battery pack (4), releasably locked to the housing (6), for supplying the electric motor with electric current. At least one spring/damping element (38), mounted between the battery pack (4) and the housing (6) of the hand power tool (2), is provided, for damping vibration and -or eliminating a locking-dictated play between the battery pack (4) and the housing (6).
    Type: Application
    Filed: December 11, 2003
    Publication date: May 1, 2008
    Applicant: ROBERT BOSCH GMBH
    Inventors: Albrecht Hofmann, Harald Krondorfer, Markus Heckmann, Kersten Heckmann, Joachim Schadow, Thomas Schomisch
  • 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: 20070155296
    Abstract: A handheld power tool has a housing, a rotating cutting tool having a clamping neck structurally connected to the housing, a guard hood that covers the cutting tool and has a guard hood part and a slip-on ring for receiving the guard hood releasably and adjustably on the clamping neck, the slip-on ring being connected to the guard hood part and having detent means for axially securing the slip-on ring to the clamping neck, and additional torsion-prevention means configured as a stop flange provided on the guard hood, the flange being provided in addition to the slip-on ring and connected to the guard hood part so that, in an installed state the stop flange is in contact with a component of the power tool that is structurally connected to the housing.
    Type: Application
    Filed: December 7, 2006
    Publication date: July 5, 2007
    Inventors: Albrecht Hofmann, Thomas Schomisch, Ralf Bocka
  • Publication number: 20070102268
    Abstract: The present invention is directed to a power tool with a removable power supply unit (32, 132, 232) on the device side for supplying electrical power, with at least one indirectly actuatable switch (14, 114, 214) for switching a drive machine on and off. It is provided that a decoupling device (58, 158, 258) for decoupling the switch (14, 114, 214) and a switching element (26, 126, 226) that at least indirectly actuates the switch (14, 114, 214) are provided.
    Type: Application
    Filed: November 8, 2004
    Publication date: May 10, 2007
    Inventors: Albrecht Hofmann, Harald Krondorfer, Thomas Schomisch
  • Publication number: 20070082590
    Abstract: The invention relates to a tool receiving device for a machine tool (14), comprising an at least essentially disk-shaped hub (42), particularly for a hand-guided angle grinder (32) or a hand-held circular saw. Said tool receiving device also comprises a drive shaft (16) and a receiving device (12) comprising at least one catching element (20) which can be displaceably mounted against a spring element (18) in order to fix the machine tool in a positive fit in the direction of the periphery (50, 52). According to the invention, the drive shaft (16) comprises at least one shaped positive fit non chip-removing element (100) which is connected in a positive fit in the direction of the periphery (50, 52) to means for the transmission of drive torque in the receiving device (12).
    Type: Application
    Filed: September 24, 2004
    Publication date: April 12, 2007
    Inventors: Ernst Kraenzler, Peter Stierle, Albrecht Hofmann, Juergen Wiker, Harald Krondorfer, Joachim Schadow, Sinisa Andrasic, Thomas Schomisch
  • 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