A powered nailer includes a power source including a driving element reciprocating within a cylinder between a prefiring position and a fastener driving position, the latter occurring when the driving element engages a bumper disposed at the bottom of the cylinder. A reciprocating valve element defines a combustion chamber in fluid communication with the cylinder, and is configured for receiving a dose of fuel and air prior to a user-generated ignition. A return chamber at least partially surrounds the cylinder and is in fluid communication with the cylinder, being configured for receiving a supply of pressurized air generated by the driving element as it moves from the prefiring position to the fastener driving position, the pressurized air acting on an underside of the driving element for returning it to the pre-firing position.

According to one aspect of the application, a device for driving a fastening element into a substrate has an energy-transfer element for transferring energy to the fastening element. The energy-transfer element can move preferably between a starting position and a setting position, wherein the energy-transfer element is located, before a driving-in procedure, in the starting position and, after the driving-in procedure, in the setting position. According to another aspect of the application, the device comprises a mechanical-energy storage device for storing mechanical energy. The energy-transfer element is then suitable preferably for transferring energy from the mechanical-energy storage device to the fastening element.

According to one aspect of the application, a device for driving a fastening element into a substrate has an energy-transfer element for transferring energy to the fastening element. The energy-transfer element can move preferably between a starting position and a setting position, wherein the energy-transfer element is located, before a driving-in procedure, in the starting position and, after the driving-in procedure, in the setting position. According to another aspect of the application, the device comprises a mechanical-energy storage device for storing mechanical energy. The energy-transfer element is then suitable preferably for transferring energy from the mechanical-energy storage device to the fastening element.

The invention relates to a driving device comprising: a hand-held housing with a piston member arranged therein for transmitting energy to a securing element to be driven in; an interchangeable propellant charge and a combustion chamber arranged between the propellant charge and the piston member, said chamber extending around a central axis (A); and an actuator, by means of which the energy transmitted by the propellant charge to the piston member can be variably adjusted, wherein a blow-off channel connected to the combustion chamber can be exposed by means of a movable slide of the actuator and the slide comprises a body which completely encircles the central axis (A).

The invention relates to a driving-in device, comprising a handheld housing, a piston element received in a piston guide for transmitting energy from a propelling charge to a securing element to be driven, and a front part which is removably connected to the piston guide. The front part and the piston guide can be moved relative to each other parallel to a central axis (A) of the piston element, and the front part is released from the piston guide by rotating the front part relative to the piston guide by a release angle, wherein a torque barrier of a securing element is overcome upon rotating by the release angle.

A driving device, comprising a hand-held housing with a piston element arranged therein for transmission of energy to a fastening element to be driven in a driving direction, a propellant charge, and a combustion chamber, which is arranged between the propellant charge and the piston element and extends around a central axis, and an actuator, by which energy to be transmitted from the propellant charge to the piston element can be varied in such that the energy can be set, wherein the combustion chamber has an internal thread and a cylindrical guiding portion, wherein the actuator is arranged in the combustion chamber and has an external thread in engagement with the internal thread and a bearing for mounting the actuator in the guiding portion, wherein a thread gap spacing between the external and internal threads is greater than a bearing gap spacing between the bearing and the guiding portion.

A noise reduction nailer and a speed adjusting assembly are described. The speed adjusting assembly may comprise a power level adjust screw and a speed adjusting member matched with it. The speed adjusting member comprises a snap ring and a locate ring fixed on the snap ring. Slots with different heights are uniformly provided on a side wall of the locate ring. The power level adjust screw is composed of two speed adjusting rings with different diameters. A bulge is provided on an inner side wall of the large-diameter speed adjusting ring and the large-diameter speed adjusting ring is adapted to the locate ring. The speed adjusting assembly can adjust the shooting power of the nailer for different base bodies, and can use a steel ball to act on a small head cone of a piston to automatically reset the piston.

A noise reduction nailer and a speed adjusting assembly are described. The speed adjusting assembly may comprise a power level adjust screw and a speed adjusting member matched with it. The speed adjusting member comprises a snap ring and a locate ring fixed on the snap ring. Slots with different heights are uniformly provided on a side wall of the locate ring. The power level adjust screw is composed of two speed adjusting rings with different diameters. A bulge is provided on an inner side wall of the large-diameter speed adjusting ring and the large-diameter speed adjusting ring is adapted to the locate ring. The speed adjusting assembly can adjust the shooting power of the nailer for different base bodies, and can use a steel ball to act on a small head cone of a piston to automatically reset the piston.

A driving device, comprising a hand-held housing with a piston element arranged therein for the transmission of energy to a fastening element to be driven in a driving direction, a propellant charge, and a combustion chamber, which is arranged between the propellant charge and the piston element and extends around a central axis, and an actuator, by which the energy to be transmitted from the propellant charge to the piston element can be varied in such a way that the energy can be set, wherein a venting channel connected to the combustion chamber can be exposed by means of a movable slide of the actuator, wherein the venting channel opens out into the combustion chamber by a vent opening, which can be partially or completely covered by the slide, and wherein a cross-sectional area of the vent opening increases in the driving direction.

A driving device, comprising a hand-held housing with a piston element arranged therein for the transmission of energy to a fastening element to be driven in a driving direction, a propellant charge, and a combustion chamber, which is arranged between the propellant charge and the piston element and extends around a central axis, and an actuator, by which the energy to be transmitted from the propellant charge to the piston element can be varied in such a way that the energy can be set, wherein a venting channel connected to the combustion chamber can be exposed by means of a movable slide of the actuator, wherein the venting channel opens out into the combustion chamber by a vent opening, which can be partially or completely covered by the slide, and wherein a cross-sectional area of the vent opening increases in the driving direction.