Patents by Inventor Donald Davidshofer

Donald Davidshofer 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: 9675223
    Abstract: A vacuum cleaner suction head having a housing with a support for movement in the fore-aft direction on a surface. A suction inlet extends through the housing, and has a front edge and a rear edge. A sealing plate is pivotally mounted on the bottom of the housing to rotate about a pivot axis extending in a transverse direction. The sealing plate is movable between a raised position and a lowered position. The sealing plate is mounted in a trailing configuration in which, when the sealing plate is in the lowered position, the pivot axis is at the front of the sealing plate with respect to a fore-aft direction, and a lowermost point on the lower surface of the sealing plate is located behind the pivot axis with respect to the fore-aft direction.
    Type: Grant
    Filed: October 6, 2014
    Date of Patent: June 13, 2017
    Assignee: MIDEA AMERICA, CORP.
    Inventors: Martin Shawn Egan, Donald Davidshofer, Thomas Josefsson
  • Publication number: 20150135477
    Abstract: A vacuum cleaner suction head having a housing with a support for movement in the fore-aft direction on a surface. A suction inlet extends through the housing, and has a front edge and a rear edge. A sealing plate is pivotally mounted on the bottom of the housing to rotate about a pivot axis extending in a transverse direction. The sealing plate is movable between a raised position and a lowered position. The sealing plate is mounted in a trailing configuration in which, when the sealing plate is in the lowered position, the pivot axis is at the front of the sealing plate with respect to a fore-aft direction, and a lowermost point on the lower surface of the sealing plate is located behind the pivot axis with respect to the fore-aft direction.
    Type: Application
    Filed: October 6, 2014
    Publication date: May 21, 2015
    Inventors: Donald Davidshofer, Thomas Josefsson
  • Patent number: 8904595
    Abstract: A vacuum cleaner suction head having a housing, one or more support to support the housing on a surface to be cleaned, a suction inlet and front and rear sealing plates. The front and rear sealing plates extend along the front and rear edges of the suction inlet, respectively. the sealing plates are movable between raised positions in which the lower surfaces of the plates are close to the housing, and lowered positions in which the lower surfaces of the plates are remote from the housing. The front and rear plates are movable from the lowered position to the raised position by contact with debris on the surface to be cleaned.
    Type: Grant
    Filed: December 13, 2011
    Date of Patent: December 9, 2014
    Assignee: Electrolux Home Care Products, Inc.
    Inventors: Donald Davidshofer, Thomas Josefsson
  • Patent number: 8656552
    Abstract: A vacuum cleaner having a base with an air inlet, a handle, a base pivot connecting the base to the handle to permit the handle to pivot between an upright parked position and a reclined operating position, a movable wheel system and a wheel system drive member. The wheel system has a wheel carriage pivotally connected at one end to the base, and at least one wheel connected to the other end. The wheel carriage pivots between a first position in which the wheel is further from the air inlet, and a second position in which the wheel is closer to the air inlet. The drive member is on the handle and positioned to contact the wheel carriage as the handle moves from the upright parked position to the reclined operating position to thereby move the wheel carriage from the first position to the second position.
    Type: Grant
    Filed: March 12, 2010
    Date of Patent: February 25, 2014
    Assignee: Electrolux Home Care Products, Inc.
    Inventors: Brian Vines, Donald Davidshofer
  • Publication number: 20130145577
    Abstract: A vacuum cleaner suction head having a housing, one or more support to support the housing on a surface to be cleaned, a suction inlet and front and rear sealing plates. The front and rear sealing plates extend along the front and rear edges of the suction inlet, respectively. the sealing plates are movable between raised positions in which the lower surfaces of the plates are close to the housing, and lowered positions in which the lower surfaces of the plates are remote from the housing. The front and rear plates are movable from the lowered position to the raised position by contact with debris on the surface to be cleaned.
    Type: Application
    Filed: December 13, 2011
    Publication date: June 13, 2013
    Inventors: Donald Davidshofer, Thomas Josefsson
  • Patent number: 8448295
    Abstract: A vacuum cleaner having a base to move on a surface, an intermediate member having a first and second passages, and a first joint connecting the base to the intermediate member to permit relative rotation between the base and the intermediate member about a first axis that is generally parallel to the surface and perpendicular to a direction of movement. An air passage connects a base inlet to the first intermediate member passage. A second joint connects a handle to the intermediate member and permits rotation between the intermediate member and the handle about a second axis that is parallel to a nominal direction of movement of the vacuum. The handle has a grip a dirt collector to receive and separate dirt from air. First and second passages connect the intermediate member passages to the dirt collector inlet and outlet. A vacuum fan draws air into the base air inlet, through the intermediate member, through the dirt collector, through the second handle air passage, and back into the intermediate member.
    Type: Grant
    Filed: March 12, 2010
    Date of Patent: May 28, 2013
    Assignee: Electrolux Home Care Products, Inc.
    Inventors: Brian Vines, Donald Davidshofer
  • Publication number: 20110219581
    Abstract: A vacuum cleaner having a base to move on a surface, an intermediate member having a first and second passages, and a first joint connecting the base to the intermediate member to permit relative rotation between the base and the intermediate member about a first axis that is generally parallel to the surface and perpendicular to a direction of movement. An air passage connects a base inlet to the first intermediate member passage. A second joint connects a handle to the intermediate member and permits rotation between the intermediate member and the handle about a second axis that is parallel to a nominal direction of movement of the vacuum. The handle has a grip a dirt collector to receive and separate dirt from air. First and second passages connect the intermediate member passages to the dirt collector inlet and outlet. A vacuum fan draws air into the base air inlet, through the intermediate member, through the dirt collector, through the second handle air passage, and back into the intermediate member.
    Type: Application
    Filed: March 12, 2010
    Publication date: September 15, 2011
    Applicant: Electrolux Home Care Products, Inc.
    Inventors: Brian Vines, Donald Davidshofer
  • Publication number: 20110219569
    Abstract: A vacuum cleaner having a base with an air inlet, a handle, a base pivot connecting the base to the handle to permit the handle to pivot between an upright parked position and a reclined operating position, a movable wheel system and a wheel system drive member. The wheel system has a wheel carriage pivotally connected at one end to the base, and at least one wheel connected to the other end. The wheel carriage pivots between a first position in which the wheel is further from the air inlet, and a second position in which the wheel is closer to the air inlet. The drive member is on the handle and positioned to contact the wheel carriage as the handle moves from the upright parked position to the reclined operating position to thereby move the wheel carriage from the first position to the second position.
    Type: Application
    Filed: March 12, 2010
    Publication date: September 15, 2011
    Applicant: Electrolux Home Care Products, Inc.
    Inventors: Brian Vines, Donald Davidshofer
  • Publication number: 20070113528
    Abstract: A vacuum cleaner dirt containment system with a bag chamber having an open end, an outlet adapted to be in fluid communication with a vacuum fan inlet located on the vacuum cleaner housing, and a plurality of locator ribs extending from an inner wall of the bag chamber. Each locator rib has a landing adjacent an inner wall of the bag chamber, and a pin located inward of the landing and extending from the landing towards the open end of the bag chamber. A filter bag assembly is adapted to be inserted into the bag chamber, and has a flange attached to an open end of a permeable filter bag. A flange air inlet passes through the flange into the bag. The flange has openings located to be inserted over the locator rib pins, and support segments located to abut the locator rib landings. The lid is selectively attachable to the open end of the bag chamber, and includes an air inlet mounting tube that extends into the flange air inlet when the lid is attached to the open end of the bag chamber.
    Type: Application
    Filed: October 18, 2006
    Publication date: May 24, 2007
    Inventors: Steven Knuth, Donald Davidshofer, Randall Sandlin
  • Publication number: 20040134014
    Abstract: Disclosed herein is a vacuum cleaner for cleaning several floor types. The vacuum cleaner includes a rotational brush roll for interfacing with the several floor types, a multi-speed motor for driving the brush roll, a speed control mechanism for controlling the speed of the multi-speed motor, and an input mechanism whereby a user selects a speed of the multi-speed motor. Further, the input mechanism is associated with at least three different speed settings.
    Type: Application
    Filed: January 10, 2003
    Publication date: July 15, 2004
    Inventors: Thomas W. Hawkins, Christer Kontio, Cennert Steffen, Donald Davidshofer