Abstract

A hand-held power tool powered by a gas combustion mechanism comprising a combustion chamber, a second chamber within a cylinder having aft and fore ends. The combustion chamber in fluid communication with the second chamber, and a first supercharger including a driver assembly, a drive motor and a fan assembly, the driver assembly having a piston and driver movable within the cylinder between said aft and fore ends. In use, whilst the piston is at or near the fore end of the cylinder, the fan assembly introduces air into the combustion chamber and the second chamber thereby pressuring the air there within, and fuel gas is introduced into the combustion chamber from a first supply port, the air and fuel gas becoming an air/fuel gas mixture therein. The drive motor moves the piston to a position at or near the aft end thereby compressing the air/fuel gas mixture within the first combustion chamber so that it is ignites within the combustion chamber to impart motion onto the piston. A second supercharger is connected to the combustion chamber for supplying a fuel gas and air mixture from a second supply port.

IPC Classes  ?

• B25C 1/08 - Hand-held nailing toolsNail feeding devices therefor operated by combustion pressure
• B25D 9/10 - Means for driving the impulse member comprising a built-in internal-combustion engine

Abstract

A hand-held power tool powered by a gas combustion mechanism comprising a first combustion chamber, a second chamber within a driving cylinder having aft and fore ends. The first combustion chamber in fluid communication with the second chamber via the aft end, a fan assembly, a driver assembly having a piston and driver movable therewithin between the aft and fore end, and a drive motor operably connected to the driver assembly. In use, whilst the piston is at or near the fore end of the driving cylinder, the fan assembly introduces air into the chambers thereby at least partially pressuring the air there within, fuel gas is introduced into the combustion chamber to form an air/fuel gas mixture therein, the drive motor operably moves the piston to a position at or near the aft end thereby compressing the air/fuel gas mixture within the combustion chamber so that the air/fuel mixture is ignited to impart motion onto the and to facilitate the operation of the tool.

IPC Classes  ?

• B25C 1/08 - Hand-held nailing toolsNail feeding devices therefor operated by combustion pressure
• B25D 9/10 - Means for driving the impulse member comprising a built-in internal-combustion engine

Abstract

A hand-held power tool is provided, the operational power of which is provided by a gas combustion mechanism. The gas combustion mechanism comprises a first priming cylinder (2) having a first piston (4) and an air intake valve (6). The priming cylinder (2) is fluidally connected via a transfer valve (8) to a combustion chamber (10) connected to a second delivery cylinder (12) having a second piston (14). In use, said first piston (4) is arranged to compress air and transfer compressed air to said combustion chamber (10) via said transfer valve (8). The combustion chamber (10) is arranged to receive said compressed air from the priming cylinder (2) and fuel gas from said fuel supply port (16). The air and fuel gas are mixed to form an air/fuel gas mixture therein. The combustion chamber (10) is also arranged so that said air/fuel mixture is ignited therein to impart motion onto said second piston (14) and to facilitate the operation of the tool.

IPC Classes  ?

• B25C 1/08 - Hand-held nailing toolsNail feeding devices therefor operated by combustion pressure
• B25C 5/10 - Driving means