Patents by Inventor David LeVasseur

David LeVasseur 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: 12618457
    Abstract: A new scissor-ramp mechanism for a Continuously Variable Transmission (CVT) provides smooth transmission of variation to the width of the groove for the V-belt of the CVT. The scissor-ramp mechanism consists in driving rings that are coaxial, concentric to each other, and rotatable relative to one another, each having a driving abutting facet; and a driven ring having driven abutting facets. The driving abutting facets are adapted to abut against the driven abutting facets, with at least one abutting facet being provided by a helicoidal ramp. Rotating the driving rings relative to one another exerts a contacting section of abutting facets to migrate over the ramp, thereby changing the axial dimension of the scissor-ramp mechanism.
    Type: Grant
    Filed: October 16, 2024
    Date of Patent: May 5, 2026
    Assignee: CVTECH-IBC INC.
    Inventors: David Levasseur, Samuel Paul, Pierre Lebel, Pascal Thibodeau
  • Publication number: 20250122925
    Abstract: A new scissor-ramp mechanism for a Continuously Variable Transmission (CVT) provides smooth transmission of variation to the width of the groove for the V-belt of the CVT. The scissor-ramp mechanism consists in driving rings that are coaxial, concentric to each other, and rotatable relative to one another, each having a driving abutting facet; and a driven ring having driven abutting facets. The driving abutting facets are adapted to abut against the driven abutting facets, with at least one abutting facet being provided by a helicoidal ramp. Rotating the driving rings relative to one another exerts a contacting section of abutting facets to migrate over the ramp, thereby changing the axial dimension of the scissor-ramp mechanism.
    Type: Application
    Filed: October 16, 2024
    Publication date: April 17, 2025
    Inventors: David LEVASSEUR, Samuel PAUL, Pierre LEBEL, Pascal THIBODEAU
  • Patent number: 11459221
    Abstract: An example autonomous vehicle includes a body configured for movement along a surface and an end-effector to hold a first element having first and second features that mate to complementary third and fourth features on a second element. At least one of the end-effector or the body is controllable to move in at least four degrees of freedom. The autonomous device includes one or more sensors to detect the second element and to obtain information for locating the third and fourth features of the second element or other compatible device. The autonomous device also includes a control system to control at least one of the end-effector or the body to move in the at least four degrees of freedom to stack the first element on top of the second element.
    Type: Grant
    Filed: April 24, 2020
    Date of Patent: October 4, 2022
    Assignee: AUTOGUIDE, LLC
    Inventors: David Levasseur, Justin Holwell
  • Patent number: 11460845
    Abstract: An automated mobile vehicle (AMV) including a frame forming a pallet bed for a pallet, and having an automated mobile robot bus, separate and distinct from the pallet bed, a drive section coupled to the frame to provide automated vehicle mobility, and a controller operably coupled to the drive section to effect automated vehicle mobility, wherein, the robot bus has a bus interface for docking independent automated mobile robots (AMR) to the frame so that the AMR is carried by the frame, wherein the AMR has independent automated mobility so that undocked from the frame, the AMR is free to roam independent from the AMV, and wherein the AMR is fungible for docking with the frame from a number different AMRs, to effect a predetermined material handling characteristic, and wherein the controller is coupled to the AMR to manage control of the predetermined material handling characteristic with the AMR undocked from the frame and moving as a unit apart from the frame.
    Type: Grant
    Filed: April 6, 2020
    Date of Patent: October 4, 2022
    Assignee: Teradyne, Inc.
    Inventor: David Levasseur
  • Patent number: 11345577
    Abstract: A mobile automated guided vehicle pallet stacker and destacker system including an automated guided vehicle having a pallet pick that moves to pick a pallet and stably hold the picked pallet on the pick. A sensor is connected to the vehicle and configured to detect a predetermined characteristic of at least one pallet located in a stack of one or more pallets. A sensing element of the sensor is mounted to the vehicle so as to define a predetermined relation between the sensing element and a pallet pick interface. Actuation of the pick effects scanning of the stack and detection, with the sensing element, of the predetermined characteristic. A controller determines from the predetermined characteristic the at least one pallet is in a topmost pallet position of the stack, and positions the pallet pick interface of the pick to interface the stack based on the determined topmost pallet position.
    Type: Grant
    Filed: October 29, 2020
    Date of Patent: May 31, 2022
    Assignee: Teradyne, Inc.
    Inventors: Justin Holwell, David Levasseur, Tyler Barron
  • Patent number: 11305786
    Abstract: An example autonomous vehicle includes a body configured for movement along a surface, a sensor on the body to output a signal in a plane and to obtain information about an environment based on the signal, and a control system to use the information to determine a location of the autonomous vehicle in the environment. The sensor is configured to keep constant the plane of the signal for different positions of the body.
    Type: Grant
    Filed: May 1, 2020
    Date of Patent: April 19, 2022
    Assignee: AUTOGUIDE, LLC.
    Inventors: David Levasseur, Michael Cullinane
  • Publication number: 20210339769
    Abstract: An example autonomous vehicle includes a body configured for movement along a surface, a sensor on the body to output a signal in a plane and to obtain information about an environment based on the signal, and a control system to use the information to determine a location of the autonomous vehicle in the environment. The sensor is configured to keep constant the plane of the signal for different positions of the body.
    Type: Application
    Filed: May 1, 2020
    Publication date: November 4, 2021
    Inventors: David Levasseur, Michael Cullinane
  • Publication number: 20210331905
    Abstract: An example autonomous vehicle includes a body configured for movement along a surface and an end-effector to hold a first element having first and second features that mate to complementary third and fourth features on a second element. At least one of the end-effector or the body is controllable to move in at least four degrees of freedom. The autonomous device includes one or more sensors to detect the second element and to obtain information for locating the third and fourth features of the second element or other compatible device. The autonomous device also includes a control system to control at least one of the end-effector or the body to move in the at least four degrees of freedom to stack the first element on top of the second element.
    Type: Application
    Filed: April 24, 2020
    Publication date: October 28, 2021
    Inventors: David Levasseur, Justin Holwell
  • Publication number: 20210141368
    Abstract: A mobile automated guided vehicle pallet stacker and destacker system including an automated guided vehicle having a pallet pick that moves to pick a pallet and stably hold the picked pallet on the pick. A sensor is connected to the vehicle and configured to detect a predetermined characteristic of at least one pallet located in a stack of one or more pallets. A sensing element of the sensor is mounted to the vehicle so as to define a predetermined relation between the sensing element and a pallet pick interface. Actuation of the pick effects scanning of the stack and detection, with the sensing element, of the predetermined characteristic. A controller determines from the predetermined characteristic the at least one pallet is in a topmost pallet position of the stack, and positions the pallet pick interface of the pick to interface the stack based on the determined topmost pallet position.
    Type: Application
    Filed: October 29, 2020
    Publication date: May 13, 2021
    Inventors: Justin Holwell, David Levasseur, Tyler Barron
  • Publication number: 20210011479
    Abstract: An automated mobile vehicle (AMV) including a frame forming a pallet bed for a pallet, and having an automated mobile robot bus, separate and distinct from the pallet bed, a drive section coupled to the frame to provide automated vehicle mobility, and a controller operably coupled to the drive section to effect automated vehicle mobility, wherein, the robot bus has a bus interface for docking independent automated mobile robots (AMR) to the frame so that the AMR is carried by the frame, wherein the AMR has independent automated mobility so that undocked from the frame, the AMR is free to roam independent from the AMV, and wherein the AMR is fungible for docking with the frame from a number different AMRs, to effect a predetermined material handling characteristic, and wherein the controller is coupled to the AMR to manage control of the predetermined material handling characteristic with the AMR undocked from the frame and moving as a unit apart from the frame.
    Type: Application
    Filed: April 6, 2020
    Publication date: January 14, 2021
    Inventor: David Levasseur
  • Patent number: 8684886
    Abstract: A method of managing a transmission ratio with an assisted CVT with a governed engine to emulate a hydrostatic transmission and prevent a drivebelt abuse is provided, the method comprising: providing a reference power source rotational speed, using the assisted CVT to transmit rotatable motion between a power source and a drive mechanism, managing a torque of the power source to maintain a substantially even rotational speed upon a power source load variation and modulating a transmission ratio of the assisted CVT to change the rotational speed of the drive mechanism. A system and a vehicle having such a drivebelt abuse preventing mechanism is also provided.
    Type: Grant
    Filed: May 13, 2011
    Date of Patent: April 1, 2014
    Assignee: CVTech Inc.
    Inventors: Hubert Roberge, David Levasseur, Francois Brind'Amour
  • Patent number: 8682549
    Abstract: Is provided herein a torque-limiting electronically controlled CVT comprising a drive portion having a drive pulley including two opposed sheaves adapted to be actuated with an electric motor to set a transmission ratio between an engine and a ground contacting rotating member of a vehicle, an input module adapted to receive a signal indicative of whether a ground-contacting rotating member is airborne, a processing module adapted to determine a desired CVT ratio, and an output module adapted to actuate the electric motor to obtain the desired CVT ratio to match the circumferential velocity of the vehicle's airborne ground-contacting rotating member with the speed of the vehicle in order to limit a mechanical peak torque sustained by a drive system of the vehicle. Also provided hereby is a vehicle equipped with the CVT, a kit including such a CVT and a method of managing the CVT to limit the mechanical peak torque sustained by a drive train of a vehicle.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: March 25, 2014
    Assignee: CVTech Inc.
    Inventors: Hubert Roberge, David Levasseur, Christian Mercier
  • Publication number: 20110277577
    Abstract: A method of managing a transmission ratio with an assisted CVT with a governed engine to emulate a hydrostatic transmission and prevent a drivebelt abuse is provided, the method comprising: providing a reference power source rotational speed, using the assisted CVT to transmit rotatable motion between a power source and a drive mechanism, managing a torque of the power source to maintain a substantially even rotational speed upon a power source load variation and modulating a transmission ratio of the assisted CVT to change the rotational speed of the drive mechanism. A system and a vehicle having such a drivebelt abuse preventing mechanism is also provided.
    Type: Application
    Filed: May 13, 2011
    Publication date: November 17, 2011
    Inventors: Hubert Roberge, David Levasseur, François Brind'Amour
  • Publication number: 20110153174
    Abstract: Is provided herein a torque-limiting electronically controlled CVT comprising a drive portion having a drive pulley including two opposed sheaves adapted to be actuated with an electric motor to set a transmission ratio between an engine and a ground contacting rotating member of a vehicle, an input module adapted to receive a signal indicative of whether a ground-contacting rotating member is airborne, a processing module adapted to determine a desired CVT ratio, and an output module adapted to actuate the electric motor to obtain the desired CVT ratio to match the circumferential velocity of the vehicle's airborne ground-contacting rotating member with the speed of the vehicle in order to limit a mechanical peak torque sustained by a drive system of the vehicle. Also provided hereby is a vehicle equipped with the CVT, a kit including such a CVT and a method of managing the CVT to limit the mechanical peak torque sustained by a drive train of a vehicle.
    Type: Application
    Filed: December 22, 2010
    Publication date: June 23, 2011
    Inventors: Hubert Roberge, David Levasseur, Christian Mercier
  • Publication number: 20050109470
    Abstract: A method of forming a safer and more secure containment for the removal or isolation of harmful and/or noxious particulate materials. The containment is formed using adhesive coated plastic sheeting to form an isolated enclosure. The adhesive holds the sheeting under negative pressure and is removable with minimal damage or transfer to wall and floor surfaces.
    Type: Application
    Filed: November 24, 2003
    Publication date: May 26, 2005
    Inventors: Christopher Freudenberg, William Freudenberg, David LeVasseur, Eugene Baratto, Curtis Larson, John Harrison