Patents by Inventor Dennis J. Van Keulen

Dennis J. Van Keulen 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: 10688509
    Abstract: A control method for a two-component spray system having first and second pumps for separate fluid components includes registering a target spray pressure, registering a material-specific pressure factor margin, sensing an output pressure of the second pump, and identifying a failure condition in the event that the sensed output pressure remains further than the pressure factor margin from the target spray pressure for at least a threshold time.
    Type: Grant
    Filed: February 4, 2019
    Date of Patent: June 23, 2020
    Assignee: Graco Minnesota Inc.
    Inventors: David L. Fehr, John R. Ingebrand, Dennis J. Van Keulen
  • Patent number: 10670002
    Abstract: A two-component pumping system includes a first pump for pumping a first component, a second pump for pumping a second component, a motor, and a yoke assembly for connecting the motor to the first pump and the second pump and driving them simultaneously. The first pump includes a first displacement rod that reciprocates in a first pump axis. The second pump includes a second displacement rod that reciprocates in a second pump axis parallel to the first pump axis. The motor includes a drive shaft configured to reciprocate in a drive axis that is parallel to and in a common plane with the first and second pump axes. The motor is also configured to drive the first and second displacement rods in unison. The yoke assembly includes a top connector and a shoe. The top connector connects to the drive shaft.
    Type: Grant
    Filed: December 14, 2015
    Date of Patent: June 2, 2020
    Assignee: Graco Minnesota Inc.
    Inventors: Dennis J. Van Keulen, Vannareth J. Chum
  • Patent number: 10413924
    Abstract: A spray system has a pump with a double-action reciprocating plunger balanced to receive equal up-stroke and down-stroke assist from a pre-pressurized supply. The reciprocating plunger has identical working surface area on opposite first and second axial faces. A pumping system has a double-action reciprocating plunger with upward- and downward-facing spacers. The plunger travels axially within a proportioning cylinder with first inlet and outlet ports at a first axial end, and second inlet and outlet ports at an opposite second axial end. When the plunger is at its top-most position, the upward-facing plunger occludes the first inlet and outlet ports without blocking flow. When the plunger is at its bottom-most position, the downward-facing plunger occludes the second inlet and outlet ports without blocking flow.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: September 17, 2019
    Assignee: Graco Minnesota Inc.
    Inventor: Dennis J. Van Keulen
  • Publication number: 20190224700
    Abstract: A control method for a two-component spray system having first and second pumps for separate fluid components includes registering a target spray pressure, registering a material-specific pressure factor margin, sensing an output pressure of the second pump, and identifying a failure condition in the event that the sensed output pressure remains further than the pressure factor margin from the target spray pressure for at least a threshold time.
    Type: Application
    Filed: February 4, 2019
    Publication date: July 25, 2019
    Inventors: David L. Fehr, John R. Ingebrand, Dennis J. Van Keulen
  • Publication number: 20190217323
    Abstract: A method for a system having a plurality of primary fluid sources and a fluid output with a common pump includes halting pumping of a first fluid, isolating the common pump from the fluid output and the primary fluid sources, connecting an inlet of the common pump to a solvent source and a compressed air source, and an outlet of the common pump to a waste fluid dump, filling the common pump with a first purge volume of solvent, cycling the common pump in a flush mode, operating the common pump in a timed flow mode, and connecting an inlet of the common pump to a second primary fluid source, and an outlet of the common pump to the output line, and starting pumping of a second fluid from the second primary fluid source through the output line.
    Type: Application
    Filed: March 22, 2019
    Publication date: July 18, 2019
    Inventors: David L. Fehr, Dennis J. Van Keulen
  • Patent number: 10300504
    Abstract: A method for a system having a plurality of primary fluid sources and a fluid output with a common pump includes halting pumping of a first fluid, isolating the common pump from the fluid output and the primary fluid sources, connecting an inlet of the common pump to a solvent source and a compressed air source, and an outlet of the common pump to a waste fluid dump, filling the common pump with a first purge volume of solvent, cycling the common pump in a flush mode, operating the common pump in a timed flow mode, and connecting an inlet of the common pump to a second primary fluid source, and an outlet of the common pump to the output line, and starting pumping of a second fluid from the second primary fluid source through the output line.
    Type: Grant
    Filed: February 1, 2018
    Date of Patent: May 28, 2019
    Assignee: Graco Minnesota Inc.
    Inventors: David L. Fehr, Dennis J. Van Keulen
  • Patent number: 10195622
    Abstract: A control method for a two-component spray system having first and second pumps for separate fluid components includes registering a target spray pressure, registering a material-specific pressure factor margin, sensing an output pressure of the second pump, and identifying a failure condition in the event that the sensed output pressure remains further than the pressure factor margin from the target spray pressure for at least a threshold time.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: February 5, 2019
    Assignee: Graco Minnesota Inc.
    Inventors: David L. Fehr, John R. Ingebrand, Dennis J. Van Keulen
  • Patent number: 10173232
    Abstract: A spray system includes a fluid source, a sprayer, a pump cylinder, a plunger, a pump motor, first and second inlet and outlet valves, a plurality of valve seals, a seal lubricant reservoir, and gravity fed seal lubricant lines. The pump cylinder is disposed fluidly between the fluid source and the sprayer. The plunger is situated within the pump cylinder and positioned by a displacement rod. The pump motor is configured to drive the displacement rod so as to reciprocate the plunger within the pump cylinder. The valve seals are disposed about the each of the first and second inlet and outlet valves. The lubricant seal lines carry seal lubricant from the reservoir to each of the valve seals.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: January 8, 2019
    Assignee: Graco Minnesota Inc.
    Inventor: Dennis J. Van Keulen
  • Publication number: 20180154388
    Abstract: A method for a system having a plurality of primary fluid sources and a fluid output with a common pump includes halting pumping of a first fluid, isolating the common pump from the fluid output and the primary fluid sources, connecting an inlet of the common pump to a solvent source and a compressed air source, and an outlet of the common pump to a waste fluid dump, filling the common pump with a first purge volume of solvent, cycling the common pump in a flush mode, operating the common pump in a timed flow mode, and connecting an inlet of the common pump to a second primary fluid source, and an outlet of the common pump to the output line, and starting pumping of a second fluid from the second primary fluid source through the output line.
    Type: Application
    Filed: February 1, 2018
    Publication date: June 7, 2018
    Inventors: David L. Fehr, Dennis J. Van Keulen
  • Publication number: 20180135608
    Abstract: A two-component pumping system includes a first pump for pumping a first component, a second pump for pumping a second component, a motor, and a yoke assembly for connecting the motor to the first pump and the second pump and driving them simultaneously. The first pump includes a first displacement rod that reciprocates in a first pump axis. The second pump includes a second displacement rod that reciprocates in a second pump axis parallel to the first pump axis. The motor includes a drive shaft configured to reciprocate in a drive axis that is parallel to and in a common plane with the first and second pump axes. The motor is also configured to drive the first and second displacement rods in unison. The yoke assembly includes a top connector and a shoe. The top connector connects to the drive shaft.
    Type: Application
    Filed: December 14, 2015
    Publication date: May 17, 2018
    Inventors: Dennis J. Van Keulen, Vannareth J. Chum
  • Patent number: 9901945
    Abstract: A method for a system having a plurality of primary fluid sources and a fluid output with a common pump includes halting pumping of a first fluid, isolating the common pump from the fluid output and the primary fluid sources, connecting an inlet of the common pump to a solvent source and an outlet of the common pump to a waste fluid dump, actuating the common pump first in a pumping mode, then in a recirculation mode, and then in a flush mode, connecting an inlet of the common pump to a second primary fluid source, and an outlet of the common pump to the output line, and starting pumping mode pumping of a second fluid from the second primary fluid source through the output line.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: February 27, 2018
    Assignee: Graco Minnesota Inc.
    Inventors: David L. Fehr, Dennis J. Van Keulen
  • Publication number: 20160167076
    Abstract: A method for a system having a plurality of primary fluid sources and a fluid output with a common pump includes halting pumping of a first fluid, isolating the common pump from the fluid output and the primary fluid sources, connecting an inlet of the common pump to a solvent source and an outlet of the common pump to a waste fluid dump, actuating the common pump first in a pumping mode, then in a recirculation mode, and then in a flush mode, connecting an inlet of the common pump to a second primary fluid source, and an outlet of the common pump to the output line, and starting pumping mode pumping of a second fluid from the second primary fluid source through the output line.
    Type: Application
    Filed: July 18, 2014
    Publication date: June 16, 2016
    Inventors: David L. Fehr, Dennis J. Van Keulen
  • Publication number: 20160153441
    Abstract: A control method for a two-component spray system having first and second pumps for separate fluid components includes registering a target spray pressure, registering a material-specific pressure factor margin, sensing an output pressure of the second pump, and identifying a failure condition in the event that the sensed output pressure remains further than the pressure factor margin from the target spray pressure for at least a threshold time.
    Type: Application
    Filed: July 18, 2014
    Publication date: June 2, 2016
    Applicant: GRACO MINNESOTA INC.
    Inventors: David L. Fehr, John R. Ingebrand, Dennis J. Van Keulen
  • Publication number: 20160151798
    Abstract: A spray system has a pump with a double-action reciprocating plunger balanced to receive equal up-stroke and down-stroke assist from a pre-pressurized supply. The reciprocating plunger has identical working surface area on opposite first and second axial faces. A pumping system has a double-action reciprocating plunger with upward- and downward-facing spacers. The plunger travels axially within a proportioning cylinder with first inlet and outlet ports at a first axial end, and second inlet and outlet ports at an opposite second axial end. When the plunger is at its top-most position, the upward-facing plunger occludes the first inlet and outlet ports without blocking flow. When the plunger is at its bottom-most position, the downward-facing plunger occludes the second inlet and outlet ports without blocking flow.
    Type: Application
    Filed: July 18, 2014
    Publication date: June 2, 2016
    Inventor: Dennis J. Van Keulen
  • Publication number: 20160146201
    Abstract: A spray system includes a fluid source, a sprayer, a pump cylinder, a plunger, a pump motor, first and second inlet and outlet valves, a plurality of valve seals, a seal lubricant reservoir, and gravity fed seal lubricant lines. The pump cylinder is disposed fluidly between the fluid source and the sprayer. The plunger is situated within the pump cylinder and positioned by a displacement rod. The pump motor is configured to drive the displacement rod so as to reciprocate the plunger within the pump cylinder. The valve seals are disposed about the each of the first and second inlet and outlet valves. The lubricant seal lines carry seal lubricant from the reservoir to each of the valve seals.
    Type: Application
    Filed: July 18, 2014
    Publication date: May 26, 2016
    Inventor: Dennis J. Van Keulen
  • Patent number: 6554204
    Abstract: A gun flush box is controlled by a plural component proportioning unit. When a color change is desired, the operator places the spray gun in the flush box. When a new color is selected, the control system automatically triggers the gun and flushes the gun with solvent with the flush material safely routed to a waste container. The control system automatically triggers the gun to refill the lines with new color paint without using excess paint as it displaces the flush solvent. This system is also capable of working with two guns in operation.
    Type: Grant
    Filed: October 8, 1999
    Date of Patent: April 29, 2003
    Assignee: Graco Inc.
    Inventors: Vu K. Nguyen, Lawrence P. Jeutter, Dennis J. Van Keulen
  • Patent number: D771719
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: November 15, 2016
    Assignee: Graco Minnesota Inc.
    Inventors: Dennis J. Van Keulen, Vannareth J. Chum