Gas spring-powered fastener driver with pressure mechanism

A gas spring-powered fastener driver comprising:

• 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 tank separator positioned within the storage chamber cylinder;
• and
• a spring that biases the tank separator toward a position in which a volume of the cylinder is decreased,
• wherein the spring biases the tank separator toward the storage chamber cylinder, and wherein as the pressure within the storage chamber cylinder increases, the pressure biases the tank separator away from the storage chamber cylinder, compressing the spring.

A gas spring-powered fastener driver comprising:

• 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,
• wherein the tank separator varies from a neutral position to an expanded position, wherein in the neutral position the tank separator has a first volume, and wherein in the expanded position, the tank separator has a second volume that is larger than the first volume.