US 12,403,575 B2
Gas spring-powered fastener driver with pressure mechanism
David A. Bierdeman, New Berlin, WI (US); Troy C. Thorson, Cedarburg, WI (US); Jacob N. Zimmerman, Pewaukee, WI (US); Andrew R. Wyler, Pewaukee, WI (US); Travis W. Leathrum, Milwaukee, WI (US); David C. Graf, Greendale, WI (US); and Alex J. Brasel, Greenfield, WI (US)
Assigned to MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed by MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed on Dec. 20, 2022, as Appl. No. 18/068,576.
Application 18/068,576 is a continuation in part of application No. PCT/US2022/037337, filed on Jul. 15, 2022.
Claims priority of provisional application 63/332,480, filed on Apr. 19, 2022.
Claims priority of provisional application 63/237,494, filed on Aug. 26, 2021.
Claims priority of provisional application 63/222,606, filed on Jul. 16, 2021.
Prior Publication US 2023/0122029 A1, Apr. 20, 2023
Int. Cl. B25C 1/04 (2006.01); B25C 1/00 (2006.01); B25C 1/06 (2006.01)
CPC B25C 1/008 (2013.01) [B25C 1/047 (2013.01); B25C 1/06 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A gas spring-powered fastener driver comprising:
a cylinder;
a storage chamber cylinder having pressurized gas 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, 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 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 gas 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 gas within the cylinder and storage chamber cylinder; and
a pressure relief valve in fluid communication with the storage chamber cylinder and configured to open in response to the pressure of the pressurized gas within the storage chamber cylinder exceeding a predetermined value,
wherein the one-way seal includes a ring and an arm in sliding contact with the cylinder, the arm being integrally formed with and extending from the ring, wherein the ring extends inward into a groove formed in the piston, and wherein the arm is movable relative to an outer circumferential surface of the piston.