Abstract: A pneumatic nailer comprising a frame defining a fastener ejection opening, and an elongated driver chamber. The driver chamber in turn defines a peripheral wall, a first end away from the fastener ejection opening and a second end towards the fastener ejection opening. The nailer also comprises trigger member and a piston member movable between a first position and a second position. The piston member comprises a piston driver slidably mounted in the driver chamber. When the piston member is moved towards the first position, the piston driver is moved towards the driver chamber first end; when the piston member is moved towards the second position, the piston driver is moved towards the driver chamber second end.

Abstract: A nailer for driving a fastener into a workpiece and comprising a main body defining a fastener ejection channel. A plunger is movably carried by the main body and defines a first end for receiving forceful mallet blows and a second end for engaging the fastener, the plunger also comprising a series of teeth and grooves and defining a longitudinal cavity extending between the first and second ends, the plunger being movable relative to the main body between a first limit position in which the plunger second end clears the fastener ejection channel, and a second limit position in which the plunger second end engages the fastener ejection channel. A stem member is carried by the nailer main body and penetrates the plunger longitudinal cavity, the stem member carrying a spring-loaded pawl capable of unidirectional releasable interlocking engagement with the teeth and grooves of the plunger. A plunger biasing member continuously biases the plunger towards the first limit position.

Abstract: A nailer for driving a fastener into a workpiece and comprising a main body defining a fastener ejection channel. A plunger is movably carried by the main body and defines a first end for receiving forceful mallet blows and a second end for engaging the fastener, the plunger also comprising a series of teeth and grooves and defining a longitudinal cavity extending between the first and second ends, the plunger being movable relative to the main body between a first limit position in which the plunger second end clears the fastener ejection channel, and a second limit position in which the plunger second end engages the fastener ejection channel. A stem member is carried by the nailer main body and penetrates the plunger longitudinal cavity, the stem member carrying a spring-loaded pawl capable of unidirectional releasable interlocking engagement with the teeth and grooves of the plunger. A plunger biasing member continuously biases the plunger towards the first limit position.

Abstract: The nailing tool has a hollow main body including a valve slidable therein. The main body includes a compressed air reservoir, the compressed air keeping the valve closed in a resting position. An anvil is provided at the upper end of the tool, with an empty annular chamber at atmospheric pressure being located under the anvil and over a ring integrally attached to the valve. Thus, if a hammer blow is dealt on the anvil, the latter loosely slides inside the main body, without reaching the ring, with the valve remaining closed and no fastener being expelled from the tool. Upon a trigger being activated on the tool handle, compressed air fills the annular chamber between the anvil and the ring. In this condition, upon a hammer blow being dealt on the anvil, the impact of the blow is transmitted by the compressed air to the underlying ring, consequently opening the valve.