Striking tool

A striking tool of an internal combustion type comprising a head valve disposed between a piston upper chamber of a cylinder which is assembled in a housing and slidable provides a piston for driving a driver and a combustion chamber disposed around a side wall of said cylinder normally opening communcation between said piston upper chamber and air, at the same time, normally closing communication between said piston upper chamber and said combustion chamber and when an explosion is generated in said combustion chamber, closing communication between said piston upper chamber and air, at the same time, opening communication between said piston upper chamber and said combustion chamber.

A striking tool of an internal combustion type comprising a sensing means of which a pressure receiving end portion is exposed to a combustion chamber disposed around a side wall of cylinder which is assembled in a housing and slidably provides a piston for driving a driver, sensing a rising of a pressure in said combustion chamber to generate a sensing signal thereof, thereby opening communication between a piston upper chamber of said cylinder and said combustion chamber, and supplying an explosion pressure to said piston upper chamber.

A striking tool of an internal combustion type comprising a valve opening communication between a piston upper chamber of a cylinder which is assembled in a housing and slidably provides a piston for driving a driver and a combustion chamber disposed around a side wall of said cylinder when an explosion is generated in said combustion chamber, an admission way for compressed air connected to a compressed air source and feeding compressed air through a feed valve, an admission way for combustible gas connected to a combustible gas source feeding said combustible gas through another feed valve and gases mixing means through said two admission way supplying mixture gas of combustible gas and compressed air into said combustion chamber.

A striking tool of an internal combustion type comprising a valve opening communication between a piston upper chamber of a cylinder which is assembled in a housing and slidably provides a piston for driving a driver and a combustion chamber disposed around a side wall of said cylinder when an explosion is generated in said combustion chamber, and an exhausting and scavenging mechanism opening an admission port for compressed air and an exhaust port for combustion gas disposed at said combustion chamber throgh the first signal sensing the bottom dead center of said piston in said cylinder and closing said admission port for compressed air through the second signal delayed to said first signal.

A striking tool of an internal combustion type comprising a valve opening communication between a piston upper chamber of a cylinder which is assembled in a housing and slidably provides a piston for driving a driver and a combustion chamber disposed around a side wall of said cylinder when an explosion is generated in said combustion chamber, and another valve releasing a back-pressure of a piston lower chamber of a cylinder in a striking stroke and opening communication between said combustion chamber and said piston lower chamber through a signal sensing that said piston reaches to the bottom dead center, thereby an explosion pressure returning said piston.