A driving tool is provided with first and second grease reservoirs for supplying grease to seal rings present on the outer and inner peripheral circumferences of a head valve in contact with a spring guide. Because of this configuration, wearing off of resistance of the seal rings due to gradual loss of grease can be improved and air leakage therefrom can also be prevented, which can improve durability of the driving tool.

A powered fastener driver includes a cylinder and a drive piston within the cylinder being acted on by a driving force resulting from a pressure differential. The powered fastener further includes a drive blade coupled to the drive piston and operable to drive a fastener, and an adjustable valve for selectively introducing air from ambient atmosphere into the cylinder, thereby changing the pressure differential acting on the drive piston. By adopting a self-contained vacuum generating means as described above, the present invention does not rely on any external vacuum source and powered fastener driver can be used and carried with conveniently.

A powered fastener driver includes a cylinder and a drive piston within the cylinder being acted on by a driving force resulting from a pressure differential. The powered fastener further includes a drive blade coupled to the drive piston and operable to drive a fastener, and an adjustable valve for selectively introducing air from ambient atmosphere into the cylinder, thereby changing the pressure differential acting on the drive piston. By adopting a self-contained vacuum generating means as described above, the present invention does not rely on any external vacuum source and powered fastener driver can be used and carried with conveniently.

A driving tool is provided with first and second grease reservoirs for supplying grease to seal rings present on the outer and inner peripheral circumferences of a head valve in contact with a spring guide. Because of this configuration, wearing off of resistance of the seal rings due to gradual loss of grease can be improved and air leakage therefrom can also be prevented, which can improve durability of the driving tool.

An apparatus and a method for driving a fastening element into a base material, the apparatus having a bolt receptacle for the fastening element and a driving-in element which is moved toward the bolt receptacle between a starting position and a setting position, the apparatus having a cylindrical container which defines a cylinder axis, the driving-in element comprising a piston which is arranged in the cylindrical container such that it can be moved along the cylinder axis, with the result that the piston closes off a part volume of the cylindrical container, and a gas which is arranged in the closed-off part volume of the cylindrical container forms a gas spring, the cylindrical container being moved toward the bolt receptacle along the cylinder axis in order to tension the gas spring when the driving-in element is situated in the starting position.

A powered fastener driver includes a cylinder and a drive piston within the cylinder being acted on by a driving force resulting from a pressure differential. The powered fastener further includes a drive blade coupled to the drive piston and operable to drive a fastener, and an adjustable valve for selectively introducing air from ambient atmosphere into the cylinder, thereby changing the pressure differential acting on the drive piston. By adopting a self-contained vacuum generating means as described above, the present invention does not rely on any external vacuum source and powered fastener driver can be used and carried with conveniently.

A powered fastener driver includes a cylinder and a drive piston within the cylinder being acted on by a driving force resulting from a pressure differential. The powered fastener further includes a drive blade coupled to the drive piston and operable to drive a fastener, and an adjustable valve for selectively introducing air from ambient atmosphere into the cylinder, thereby changing the pressure differential acting on the drive piston. By adopting a self-contained vacuum generating means as described above, the present invention does not rely on any external vacuum source and powered fastener driver can be used and carried with conveniently.