Patents by Inventor David A. Bierdeman

David A. Bierdeman 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).

  • Publication number: 20260158630
    Abstract: A powered fastener driver includes a housing defining a cylinder support portion and a handle portion. The cylinder support portion includes a first side and a second side opposite the first side. The handle portion extends from the first side of the cylinder support portion. The cylinder support portion includes a flat segment on the second side configured to support the powered fastener driver on a support surface in an inverted position with the handle portion extending away from the support surface. A cylinder is within the cylinder support portion. A nosepiece extends from the housing and includes a fastener driving channel through which consecutive fasteners are driven. The fastener driving channel extends along a driving axis. A magazine is coupled to the nosepiece and is configured to consecutively deliver the fasteners to the fastener driving channel.
    Type: Application
    Filed: December 5, 2025
    Publication date: June 11, 2026
    Inventors: Marcus M. Wechselberger, David A. Bierdeman, Logan M. Hietpas, Jeremy J. Keifenheim
  • Patent number: 12649220
    Abstract: A powered fastener driver includes a housing, a cylinder supported by the housing, and a moveable piston positioned within and moveable along a driving axis of the cylinder. The piston includes a circumferential groove on an outer peripheral surface thereof. A driver blade is attached to the piston and moveable therewith between a top-dead-center (TDC) position and a driven or bottom-dead-center (BDC) position. A seal assembly is received in the circumferential groove. The seal assembly is configured to create a seal between the piston and the cylinder. The seal assembly includes a biasing member and a seal member positioned radially outwardly of the biasing member relative to the driving axis.
    Type: Grant
    Filed: June 2, 2022
    Date of Patent: June 9, 2026
    Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
    Inventors: Mitchell T. Neuhoff, Jason M. Julius, David A. Bierdeman, Logan M. Hietpas, Jacob N. Zimmerman, Jeremy J. Keifenheim
  • Publication number: 20260138252
    Abstract: A powered fastener driver includes a housing, a cylinder within a cylinder support portion of the housing, a piston movable within the cylinder from a top-dead-center (TDC) position to a driven or bottom-dead-center (BDC) position, a driver blade attached to the piston for movement therewith, a lifter operable to move the piston and driver blade, in unison, from the BDC position toward the TDC position, a drive unit operably coupled to the lifter, and a printed circuit board positioned within the housing. The printed circuit board includes a plurality of power switches and defines a length and a width. A vibration attenuating damper is positioned between the housing and the printed circuit board. The damper is positioned along the length of the printed circuit board and configured to support the printed circuit board within the housing.
    Type: Application
    Filed: January 12, 2026
    Publication date: May 21, 2026
    Inventors: Kirat S. Mokha, Ryan A. Khatib, Logan M. Hietpas, Jeremy J. Keifenheim, David A. Bierdeman, Jason M. Julius, Rosalie C. Phillips, Ivan N. Zozulya, Jacob N. Zimmerman, Alex D. Servais, Mitchell T. Neuhoff
  • Patent number: 12605817
    Abstract: A powered fastener driver includes a driver blade movable from a top-dead-center (TDC) position toward a driven or bottom-dead-center (BDC) position for driving a fastener into a workpiece, a gas spring mechanism for driving the driver blade toward the BDC position, and a lifter assembly having a rotary lifter for returning the driver blade from the BDC position toward the TDC position. The powered fastener driver further includes an arm upon which the rotary lifter is supported, a motor which, in a first position of the rotary lifter, provides torque to the rotary lifter to return the driver blade from the BDC position toward the TDC position, and a brake mechanism including an electromagnet which, when activated, causes the rotary lifter to move from the first position toward a second position in which the rotary lifter is not engageable with the driver blade.
    Type: Grant
    Filed: December 9, 2024
    Date of Patent: April 21, 2026
    Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
    Inventors: Marcus Wechselberger, Troy C. Thorson, David A. Bierdeman
  • Publication number: 20260097477
    Abstract: A gas spring-powered fastener driver includes a cylinder, a storage chamber cylinder having pressurized air in communication with the cylinder, a moveable piston positioned within the cylinder, a driver blade attached to the piston and movable therewith between a top-dead-center position and a bottom-dead-center position, the driver blade defining a driving axis, a lifter operable to move the driver blade from the bottom-dead-center position toward the top-dead-center position, the lifter is configured to engage the driver blade when moving the driver blade from the bottom-dead-center position toward the top-dead-center position, and a tank separator positioned within the storage chamber cylinder. The tank separator is moved in response to a pressure of the air within the storage chamber cylinder reaching a predetermined level, and when the tank separator is moved, a volume of the cylinder increases or decreases.
    Type: Application
    Filed: December 11, 2025
    Publication date: April 9, 2026
    Inventors: David A. Bierdeman, Troy C. Thorson, Jacob N. Zimmerman, Andrew R. Wyler, Travis W. Leathrum, David C. Graf, Alex J. Brasel
  • Publication number: 20260034653
    Abstract: A powered fastener driver includes a driver blade movable from a top-dead-center (TDC) position to a bottom-dead-center (BDC) position, and a drive unit providing torque to move the driver blade, the drive unit having an output shaft defining a rotational axis. The driver further includes a rotary lifter engageable with the driver blade and receives torque from the drive unit in a rotational direction for returning the driver blade from the BDC position toward the TDC position, an aperture defined within the lifter through which the output shaft extends permitting radial movement of the lifter relative to the output shaft between a first position and a second position, and a spring biasing the lifter to the first position. The lifter translates in a radial direction relative to the output shaft from the first position toward the second position from engagement with the driver blade while rotating in the rotational direction.
    Type: Application
    Filed: October 14, 2025
    Publication date: February 5, 2026
    Inventors: David A. Bierdeman, Troy C. Thorson, Jacob P. Schneider, Mackenzie J. Nick, Nathan Bandy, Travis W. Leathrum, Mitchell T. Neuhoff, Mark C. Hughes, David C. Graf, Marcus Wechselberger, Leonard F. Mikat-Stevens, Jacob N. Zimmerman, Jason M. Julius, Rosalie C. Phillips, Beth E. Cholst
  • Patent number: 12539592
    Abstract: Power tools described herein include an electric motor, a driver blade, a trigger switch, a safety switch, and an electronic controller. The electronic controller is connected to the electric motor, the trigger switch, and the safety switch. The electronic controller is configured to initiate a retraction cycle by controlling the electric motor to move the driver blade from a first position to a second position, determine a position of the driver blade during the retraction cycle, initiate, in response to the position of the driver blade exceeding a first threshold, a braking cycle at the electric motor, and abort, in response to detecting a first activation of the trigger switch and a second activation of the safety switch, the braking cycle.
    Type: Grant
    Filed: September 13, 2024
    Date of Patent: February 3, 2026
    Assignee: Milwaukee Electric Tool Corporation
    Inventors: Mitchell A. Ellena, Ryan Khatib, Lokeshwaran Rajendran, David A. Bierdeman
  • Patent number: 12533778
    Abstract: A powered fastener driver including a housing, a cylinder, a piston movable within the cylinder from a TDC position to a BDC position, a driver blade attached to the piston for movement therewith along a driving axis from the TDC position toward the BDC position for driving a fastener into a workpiece, a lifter operable to move the piston and driver blade, in unison, from the BDC position toward the TDC position, a drive unit operably coupled to the lifter, and a printed circuit board (PCB) positioned within the housing. The PCB receives electrical current from the battery pack and includes power switches for commutating the motor. The PCB defines a length and a width, and a vibration attenuating damper is positioned between the housing and the printed circuit board. The damper is positioned along the length of the PCB and is configured to support the PCB within the housing.
    Type: Grant
    Filed: August 19, 2024
    Date of Patent: January 27, 2026
    Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
    Inventors: Kirat S. Mokha, Ryan A. Khatib, Logan M. Hietpas, Jeremy J. Keifenheim, David A. Bierdeman, Jason M. Julius, Rosalie C. Phillips, Ivan N. Zozulya, Jacob N. Zimmerman, Alex D. Servais, Mitchell T. Neuhoff
  • Publication number: 20260021565
    Abstract: A magazine assembly including a body having a first end, a second end opposite the first end, a first side, a second side opposite the first side, a third side, and a fourth side opposite the third side. A rib extends from the body and is positioned adjacent to the second side. A fastener channel extends between the first end and the second end. A first elongate channel is positioned in the first side of the body and extends between the first end and the second end, and a second elongate channel is positioned in the second side of the body and extends between the first end and the second end. A first insert is positioned within the first elongate channel and partially extends into the fastener channel and a second insert is positioned within the second elongate channel and partially extends into the fastener channel.
    Type: Application
    Filed: July 16, 2025
    Publication date: January 22, 2026
    Inventors: Marcus M. Wechselberger, Garrett J. Kocourek, David A. Bierdeman, David C. Graf
  • Patent number: 12521854
    Abstract: A gas spring-powered fastener driver includes a cylinder, a storage chamber cylinder having pressurized air in communication with the cylinder, a moveable piston positioned within the cylinder, a driver blade attached to the piston and movable therewith between a top-dead-center position and a bottom-dead-center position, the driver blade defining a driving axis, a lifter operable to move the driver blade from the bottom-dead-center position toward the top-dead-center position, the lifter is configured to engage the driver blade when moving the driver blade from the bottom-dead-center position toward the top-dead-center position, a bumper positioned beneath the piston in a vertical direction to absorb impact energy from the piston, and a valve positioned in the storage chamber cylinder. In response to the piston compressing the bumper while absorbing impact energy from the piston, the valve adds pressurized air from the cylinder to the storage chamber cylinder.
    Type: Grant
    Filed: July 15, 2022
    Date of Patent: January 13, 2026
    Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
    Inventors: David A. Bierdeman, Troy C. Thorson, Jacob N. Zimmerman, Andrew R. Wyler, Travis W. Leathrum, David C. Graf, Alex J. Brasel
  • Publication number: 20250367802
    Abstract: A gas spring-powered fastener driver includes a cylinder, a storage chamber cylinder having pressurized air in communication with the cylinder, a moveable piston positioned within the cylinder, a driver blade extending from a first side of the piston and movable therewith between a top-dead-center position and a bottom-dead-center position, a one-way seal carried onboard the piston and disposed between the piston and the cylinder, the one-way seal being configured permit a bypass flow of pressurized air from the first side of the piston, past the one-way seal, and into a space within the cylinder adjacent an opposite, second side of the piston during movement of the piston and driver blade from the top-dead-center position to the bottom-dead-center position, thereby increasing a pressure of the pressurized air within the cylinder and storage chamber cylinder, and a pressure relief valve in fluid communication with the storage chamber cylinder.
    Type: Application
    Filed: August 11, 2025
    Publication date: December 4, 2025
    Inventors: David A. Bierdeman, Troy C. Thorson, Jacob N. Zimmerman, Andrew R. Wyler, Travis W. Leathrum, David C. Graf, Alex J. Brasel
  • Publication number: 20250367780
    Abstract: A belt sander includes a handle and a main housing having a first lateral sidewall, a second lateral sidewall opposite the first lateral sidewall, and a front end perpendicular to the first lateral sidewall. The belt sander further includes a drive unit disposed within the main housing between the first lateral sidewall and the second lateral sidewall, and a belt drive system driven by the drive unit. The belt sander further includes a first light disposed on the first lateral sidewall and a first lens for projecting light onto a first area of the workpiece that runs alongside the first lateral sidewall. The belt sander further includes a second light disposed on the front end and a second lens for projecting light onto a second area of the workpiece that is adjacent the driven wheel.
    Type: Application
    Filed: August 21, 2025
    Publication date: December 4, 2025
    Inventors: James C. Sitter, Jeffrey S. Holly, Joseph G. Bloomfield, David A. Bierdeman, Logan M. Hietpas, Adam N. Carter, Nikos A. Gainacopulos, Eric K. Farrington, Christopher M. Didier, Benjamin J. Ludy
  • Patent number: 12479074
    Abstract: A powered fastener driver includes a driver blade and a drive unit having an output shaft for providing torque to move the driver blade from the bottom-dead-center position toward the top-dead-center position. A rotary lifter is engageable with the driver blade and configured to receive torque from the output shaft of the drive unit in a first rotational direction for returning the driver blade from the bottom-dead-center position toward the top-dead-center position. A kickout arrangement is defined between the lifter and the output shaft and configured to permit limited movement of the lifter relative to the output shaft between a first position and a second position. The kickout arrangement having a curvilinear slot defined in the rotary lifter in which a portion of the output shaft is received. Movement of the rotary lifter from the first position toward the second position causes the slot to move relative to the output shaft, while the output shaft remains within the slot.
    Type: Grant
    Filed: February 13, 2023
    Date of Patent: November 25, 2025
    Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
    Inventors: David A. Bierdeman, Troy C. Thorson, Jacob P. Schneider, Mackenzie J. Nick, Nathan Bandy, Travis W. Leathrum, Mitchell T. Neuhoff, Mark C. Hughes, David C. Graf, Marcus Wechselberger, Leonard F. Mikat-Stevens, Jacob N. Zimmerman, Jason M. Julius, Rosalie C. Phillips, Beth E. Cholst
  • Publication number: 20250319535
    Abstract: A saw including a spindle assembly having a frame and a spindle that reciprocates between a back-dead-center (BDC) to a front-dead-center (FDC) along a spindle axis. The spindle includes a blade connection that defines a connection axis. The saw includes an orbital plate, an eccentric drive member, and a follower engaged with a cam surface on the orbital plate to pivot the frame about a pivot axis. The cam surface includes a high frequency segment occupying less than 180 degrees of a circumference of the cam surface. A displacement of the connection axis relative in a direction perpendicular to the spindle axis is zero at the FDC. A total displacement of the connection axis in the direction perpendicular to the spindle axis occurs during a forward stroke and a reverse stroke. The high frequency segment is configured to displace the connection axis between 80% to 100% of the total displacement.
    Type: Application
    Filed: April 9, 2025
    Publication date: October 16, 2025
    Inventors: Christopher M. Didier, David A. Bierdeman, Connor M. Temme
  • Publication number: 20250289107
    Abstract: A powered fastener driver including a driver blade movable from a top-dead-center (TDC) position toward a bottom-dead-center (BDC) position for driving a fastener into a workpiece, a nosepiece through which the fastener is driven into the workpiece that is configured to guide the driver blade and the fastener into the workpiece, and a lifting assembly for providing torque to move the driver blade from the (BDC) position toward the TDC position. The lifting assembly includes a rotary lifter for engaging the driver blade to move the driver blade toward the (TDC) position. The rotary includes a body having a central aperture, a flange radially extending from the body that defines an outer radial profile configured to contact the driver blade to return the driver blade from the BDC position toward the TDC position, and a non-rotating mounting shaft coupled to the central aperture to rotatably support the rotary lifter thereon.
    Type: Application
    Filed: March 13, 2025
    Publication date: September 18, 2025
    Inventors: Travis W. Leathrum, David A. Bierdeman
  • Publication number: 20250289112
    Abstract: An oscillating power tool includes a housing, a motor disposed generally within the housing and including a drive shaft, an output spindle configured to be driven by the motor and journaled for oscillating rotation about an oscillation axis, a drive mechanism configured to convert rotation of the drive shaft into oscillating rotation of the output spindle about the oscillation axis, the drive mechanism including an eccentric member configured to rotate off center about the motor axis, and a forked member operatively coupled to the eccentric member and configured for oscillating rotation about the oscillation axis in response to rotation of the eccentric member, and an amplitude adjustment actuator configured to move the eccentric member in the direction generally parallel to the motor axis to change an angular amplitude of oscillating rotation of the forked member.
    Type: Application
    Filed: June 3, 2025
    Publication date: September 18, 2025
    Inventors: James C. Sitter, David A. Bierdeman
  • Patent number: 12403575
    Abstract: A gas spring-powered fastener driver includes a cylinder, a storage chamber cylinder having pressurized air in communication with the cylinder, a moveable piston positioned within the cylinder, a driver blade extending from a first side of the piston and movable therewith between a top-dead-center position and a bottom-dead-center position, a one-way seal carried onboard the piston and disposed between the piston and the cylinder, the one-way seal being configured permit a bypass flow of pressurized air from the first side of the piston, past the one-way seal, and into a space within the cylinder adjacent an opposite, second side of the piston during movement of the piston and driver blade from the top-dead-center position to the bottom-dead-center position, thereby increasing a pressure of the pressurized air within the cylinder and storage chamber cylinder, and a pressure relief valve in fluid communication with the storage chamber cylinder.
    Type: Grant
    Filed: December 20, 2022
    Date of Patent: September 2, 2025
    Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
    Inventors: David A. Bierdeman, Troy C. Thorson, Jacob N. Zimmerman, Andrew R. Wyler, Travis W. Leathrum, David C. Graf, Alex J. Brasel
  • Publication number: 20250269509
    Abstract: Power tools described herein include an electric motor, a driver blade, a trigger switch, a safety switch, and an electronic controller. The electronic controller is connected to the electric motor, the trigger switch, and the safety switch. The electronic controller is configured to initiate a retraction cycle by controlling the electric motor to move the driver blade from a first position to a second position, determine a position of the driver blade during the retraction cycle, initiate, in response to the position of the driver blade exceeding a first threshold, a braking cycle at the electric motor, and abort, in response to detecting a first activation of the trigger switch and a second activation of the safety switch, the braking cycle.
    Type: Application
    Filed: April 25, 2025
    Publication date: August 28, 2025
    Inventors: Mitchell A. Ellena, Ryan Khatib, Lokeshwaran Rajendran, David A. Bierdeman
  • Patent number: 12397390
    Abstract: A belt sander for sanding a workpiece and defining a center of gravity within a first plane. The belt sander includes a housing, a handle defining a second plane, and a drive unit disposed within the housing. The drive unit includes a motor disposed adjacent a first sidewall of the housing, a pulley system disposed adjacent a second sidewall of the housing opposite the first sidewall, and a transmission disposed between the motor and the pulley system. The belt sander further includes a belt drive system driven by the drive unit and including a drive wheel, a driven wheel, and a platen. The platen defines a third plane extending perpendicular therefrom. The transmission and pulley system are disposed on one side of the first plane and the motor is disposed on an opposite side of the first plane. The motor is intersected by the second and third planes.
    Type: Grant
    Filed: April 11, 2022
    Date of Patent: August 26, 2025
    Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
    Inventors: James C. Sitter, Jeffrey S. Holly, Joseph G. Bloomfield, David A. Bierdeman, Logan M. Hietpas, Adam N. Carter, Nikos A. Gainacopulos, Eric K. Farrington, Christopher M. Didier, Benjamin J. Ludy
  • Publication number: 20250229396
    Abstract: A powered fastener driver including a driver blade movable from a top-dead-center position to a bottom-dead-center position for driving a fastener into a workpiece. A driver may include a lifting assembly for providing torque to move the driver blade from the bottom-dead-center position toward the top-dead-center position, the lifting assembly including a rotary lifter configured to be selectively engageable with the driver blade, the rotary lifter having a plurality of lift pins and a roller disposed on at least one of the lift pins, wherein the roller includes a plurality of cam portions defined by cup-shaped recesses having a first radius oriented parallel to a rotational direction of the roller and a second radius perpendicular to the first radius, and wherein the driver blade includes a lift tooth having a crown disposed thereon, the crown configured to be engaged with at least one of the plurality of cam portions.
    Type: Application
    Filed: January 10, 2025
    Publication date: July 17, 2025
    Inventors: Marcus Wechselberger, Andrew J. Weber, David A. Bierdeman, Jeremy J. Keifenheim, Sathish Xavier, Jacob N. Zimmerman, David C. Graf, Garrett J. Kocourek