Patents by Inventor David C. Graf
David C. Graf 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).
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Publication number: 20260183927Abstract: Embodiments of the disclosure relate to a fastener driver. The fastener driver includes a cylinder housing, a storage chamber disposed within the cylinder housing in which the storage chamber is configured to hold a pressurized gas, a piston sleeve disposed within the storage chamber, a piston configured to translate linearly within the piston sleeve, and a driver blade attached to the piston such that movement of the piston causes movement of the driver blade to drive a fastener into a workpiece. The piston sleeve includes an outer layer defining a cylindrical tube and a collar. An interior of the collar is reinforced with a composite component comprising a thermoplastic polymer matrix filled with long fibers.Type: ApplicationFiled: February 25, 2026Publication date: July 2, 2026Inventors: Jacob N. Nemec, Kentez L. Craig, Amith J. Baskaran, Marcus M. Wechselberger, David C. Graf
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Publication number: 20260175385Abstract: A powered fastener driver includes a housing, a cylinder within the housing that has an outer shell formed from a first material, and an inner sleeve at least partially located within the outer shell that is formed from a different, second material. The fastener driver also includes a piston movable within the cylinder from a top-dead-center (TDC) position to a driven or bottom-dead-center (BDC) position, and a driver blade coupled for movement with the piston between the TDC position and the BDC position during a fastener driving operation.Type: ApplicationFiled: December 19, 2025Publication date: June 25, 2026Inventors: Joseph A. Jurss, Alex G. Bournoville, David M. Pittman, Marcus M. Wechselberger, Jacob N. Nemec, David C. Graf
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Publication number: 20260097477Abstract: 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: ApplicationFiled: December 11, 2025Publication date: April 9, 2026Inventors: David A. Bierdeman, Troy C. Thorson, Jacob N. Zimmerman, Andrew R. Wyler, Travis W. Leathrum, David C. Graf, Alex J. Brasel
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Patent number: 12583088Abstract: A fastener driver includes a magazine having a magazine cover and a magazine body. The magazine cover includes a top surface having an opening defined therein. The magazine body is slidably movable relative to the magazine cover from a closed position to an open position. A latch is coupled to the top surface of the magazine cover and extends through the opening in the top surface of the magazine cover. The latch includes a latch projection that defines a first contact surface. A pusher body is slidably coupled to the magazine body and includes an arm member that defines a second contact surface. A biasing member biases the pusher toward a nosepiece when the magazine body is in the closed position. The first and second contact surfaces are engageable to hold the pusher body in a latched position when the magazine body is in the open position.Type: GrantFiled: November 22, 2023Date of Patent: March 24, 2026Assignee: MILWAUKEE ELECTRIC TOOL CORPORATIONInventors: Coby A. Nettleton, Leonard F. Mikat-Stevens, Marcus Wechselberger, David C. Graf, Alex D. Servais
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Patent number: 12583092Abstract: Embodiments of the disclosure relate to a power tool. The power tool includes at least one hybrid composite component. The hybrid composite component includes a housing component and a composite component. The composite component is made of a first thermoplastic polymer matrix filled with long fibers in which most of the long fibers have a length of at least 0.5 inches.Type: GrantFiled: March 29, 2024Date of Patent: March 24, 2026Assignee: Milwaukee Electric Tool CorporationInventors: Jacob N. Nemec, Kentez L. Craig, Amith J. Baskaran, Marcus M. Wechselberger, David C. Graf
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Publication number: 20260070202Abstract: A powered fastener driver including: a rotary lifter rotatably supported within the housing and configured to sequentially engage the plurality of teeth to move a driver blade from a bottom-dead-center position toward a top-dead-center position; a drive unit configured to provide torque to the rotary lifter, causing it to rotate; a nosepiece defining a fastener driving channel, the fastener driving channel extending along a driving axis of the driver blade; a workpiece contact element movable relative to the nosepiece between an extended position and a retracted position; a sensor assembly including a first inductive sensor configured to detect a position of the workpiece contact element in one of the extended position or the retracted position; and a second inductive sensor configured to detect an angular position of the rotary lifter, wherein the first inductive sensor and the second inductive sensor are on opposite sides of the rotary lifter.Type: ApplicationFiled: September 8, 2025Publication date: March 12, 2026Inventors: Kirat S. Mokha, Mitchell A. Ellena, Noah P. Seiler, Lokeshwaran Rajendran, Mark C. Hughes, David C. Graf
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Publication number: 20260034653Abstract: 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: ApplicationFiled: October 14, 2025Publication date: February 5, 2026Inventors: 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
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Publication number: 20260021565Abstract: 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: ApplicationFiled: July 16, 2025Publication date: January 22, 2026Inventors: Marcus M. Wechselberger, Garrett J. Kocourek, David A. Bierdeman, David C. Graf
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Patent number: 12521854Abstract: 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: GrantFiled: July 15, 2022Date of Patent: January 13, 2026Assignee: MILWAUKEE ELECTRIC TOOL CORPORATIONInventors: David A. Bierdeman, Troy C. Thorson, Jacob N. Zimmerman, Andrew R. Wyler, Travis W. Leathrum, David C. Graf, Alex J. Brasel
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Publication number: 20250367802Abstract: 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: ApplicationFiled: August 11, 2025Publication date: December 4, 2025Inventors: David A. Bierdeman, Troy C. Thorson, Jacob N. Zimmerman, Andrew R. Wyler, Travis W. Leathrum, David C. Graf, Alex J. Brasel
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Patent number: 12479074Abstract: 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: GrantFiled: February 13, 2023Date of Patent: November 25, 2025Assignee: MILWAUKEE ELECTRIC TOOL CORPORATIONInventors: 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
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Publication number: 20250282039Abstract: A powered fastener driver includes a housing, a cylinder within the housing, the cylinder containing a pressurized gas, a piston within the cylinder and movable from a top-dead-center position to a bottom-dead-center position, a driver blade movably coupled to the piston, a lifter, a drive unit configured to provide torque to the lifter, and a sensor. The driver blade has a plurality of teeth. The sensor is configured to detect one or more of the plurality of teeth and a controller in communication with the drive unit and the sensor. The controller is configured to count a number of the plurality of teeth detected by the sensor, compare the number of detected teeth to a predetermined number of teeth, and stop the drive unit when the number of detected teeth is less than the predetermined number of teeth.Type: ApplicationFiled: May 21, 2025Publication date: September 11, 2025Inventors: Arik A. Miller, Kirat S. Mokha, Mitchell A. Ellena, Marcus M. Wechselberger, David C. Graf
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Patent number: 12403575Abstract: 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: GrantFiled: December 20, 2022Date of Patent: September 2, 2025Assignee: MILWAUKEE ELECTRIC TOOL CORPORATIONInventors: David A. Bierdeman, Troy C. Thorson, Jacob N. Zimmerman, Andrew R. Wyler, Travis W. Leathrum, David C. Graf, Alex J. Brasel
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Publication number: 20250229396Abstract: 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: ApplicationFiled: January 10, 2025Publication date: July 17, 2025Inventors: Marcus Wechselberger, Andrew J. Weber, David A. Bierdeman, Jeremy J. Keifenheim, Sathish Xavier, Jacob N. Zimmerman, David C. Graf, Garrett J. Kocourek
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Patent number: 12318899Abstract: A powered fastener driver includes a housing, a cylinder within the housing, the cylinder containing a pressurized gas, a piston within the cylinder and movable from a top-dead-center position to a bottom-dead-center position, a driver blade movably coupled to the piston, a lifter, a drive unit configured to provide torque to the lifter, and a sensor. The driver blade has a plurality of teeth defining a predetermined number of edges. The sensor is configured to detect an edge of one or more of the plurality of teeth and a controller in communication with the drive unit and the sensor. The controller is configured to count a number of edges detected by the sensor, compare the number of detected edges to the predetermined number of edges, and stop the drive unit when the number of detected edges is less than the predetermined number of edges.Type: GrantFiled: January 25, 2024Date of Patent: June 3, 2025Assignee: MILWAUKEE ELECTRIC TOOL CORPORATIONInventors: Arik A. Miller, Kirat S. Mokha, Mitchell A. Ellena, Marcus M. Wechselberger, David C. Graf
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Publication number: 20250114926Abstract: A powered fastener driver comprising a housing, a nosepiece extending from the housing, a workpiece contact bracket at least partially surrounding the nosepiece, wherein the workpiece contact bracket slides on the nosepiece, a driver blade movable within the nosepiece between a ready position and a driven position, and a drive mechanism operatively coupled with the driver blade to drive the driver blade. The nosepiece includes a tail extending outwardly at least partially along a length of the nosepiece and the workpiece contact bracket includes an internal bore having a tail socket extending at least partially along a length of the workpiece contact bracket, wherein the tail of the nosepiece fits into the tail socket of the workpiece contact bracket to form a slip fit elongated dovetail joint between the nosepiece and the workpiece contact bracket.Type: ApplicationFiled: December 19, 2024Publication date: April 10, 2025Inventors: Mitchell T. Neuhoff, Mark C. Hughes, Jacob N. Zimmerman, Ivan N. Zozulya, Travis W. Leathrum, Troy C. Thorson, Michael B. Koeppel, Bradley S. Houskamp, Lokeshwaran Rajendran, Mitchell A. Ellena, David C. Graf, Caleb M. Schober
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Patent number: 12202112Abstract: A fastener driver includes a housing defining a head portion and a handle portion, a drive mechanism positioned within the housing, and a firing mechanism. The firing mechanism includes a piston, a driver blade attached to the piston, a biasing member having a first end supported within the piston and a second end supported by the head portion, and a damper positioned between the firing mechanism and the head portion of the housing. The damper configured to attenuate one or more of noise or vibration from the firing mechanism as the driver blade moves from the top dead center position toward the bottom dead center position.Type: GrantFiled: March 4, 2022Date of Patent: January 21, 2025Assignee: MILWAUKEE ELECTRIC TOOL CORPORATIONInventors: Coby A. Nettleton, Leonard F. Mikat-Stevens, Marcus Wechselberger, David C. Graf, Alex D. Servais
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Patent number: 12179325Abstract: A powered fastener driver includes a housing, a nosepiece extending from the housing, a driver blade movable within the nosepiece between a ready position and a driven position the driver blade comprising a plurality of drive teeth on a first side of the driver blade and a plurality of locking projections on a second side of the driver blade, a piston coupled to the driver blade for movement therewith, a driver cylinder within which the piston is movable, a storage chamber cylinder containing pressurized gas therein and in fluid communication with the driver cylinder, a first end of the driver cylinder being affixed to a corresponding first end of the storage chamber cylinder, and a latch actuator assembly adjacent the driver blade, wherein the latch actuator assembly includes a latch to engage one of the plurality of locking projections to prevent the driver blade from moving toward the driven position.Type: GrantFiled: February 16, 2023Date of Patent: December 31, 2024Assignee: MILWAUKEE ELECTRIC TOOL CORPORATIONInventors: Mitchell T. Neuhoff, Mark C. Hughes, Jacob N. Zimmerman, Ivan N. Zozulya, Travis W. Leathrum, Troy C. Thorson, Michael B. Koeppel, Bradley S. Houskamp, Lokeshwaran Rajendran, Mitchell A. Ellena, David C. Graf, Caleb M. Schober
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Patent number: 12179326Abstract: A powered fastener driver includes a driver blade movable from a top-dead-center (TDC) position to a bottom-dead-center (BDC) position for driving a fastener into a workpiece and a drive unit for providing torque to move the driver blade from the BDC position toward the TDC position. A kickout arrangement is at least partially defined by an outer surface on one of a torque output member and a torque input member and an aperture formed in the other of the torque output member and the torque input member in which the outer surface is received. The kickout arrangement configured to permit limited rotation of the torque output member relative to the torque input member between a first position and a second position.Type: GrantFiled: February 4, 2022Date of Patent: December 31, 2024Assignee: MILWAUKEE ELECTRIC TOOL CORPORATIONInventors: 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
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Publication number: 20240308042Abstract: 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: ApplicationFiled: July 15, 2022Publication date: September 19, 2024Inventors: David A. Bierdeman, Troy C. Thorson, Jacob N. Zimmerman, Andrew R. Wyler, Travis W. Leathrum, David C. Graf, Alex J. Brasel