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.
Abstract:
A gas fastening tool comprising an internal combustion engine including one combustion chamber, fuel injection means to inject fuel into the chamber and air injection means to inject air into the chamber, firing means for an air-fuel mixture within the chamber, reception means to receive a fastening element, one cylinder communicating with the chamber, forming together a combustion gas propagation pathway and wherein a piston is slidingly mounted so as to drive the fastening element, such tool being characterized in that it comprises a duct provided with a downstream input mouth and an upstream output mouth on the gas pathway, the piston stroke in the cylinder extending between the two duct mouths.
Abstract:
The invention relates to a method for controlling injection processes in fuel-operated fastening tools (1) comprising a fuel tank (8) which has a certain fuel tank temperature and in which a fuel tank pressure prevails and from which fuel is fed to a combustion chamber (12) by a time-controlled metering device (10), the combustion chamber being at a certain combustion chamber temperature. In order to further improve control of injection processes, a metering time of the time-controlled metering device (10) is determined directly or indirectly from an estimated required amount of fuel and an estimated metering rate with the help of the fuel tank pressure.
Abstract:
A combustion-powered fastener-driving tool (50) includes a combustion-powered power source (14) having a combustion chamber (18), a reciprocating piston (22) and driver blade (24), and a valve sleeve (36) reciprocable relative to the power source (14) between a rest position and a firing position. The valve sleeve (36) partially defines the combustion chamber (18). A lockout device (60) is in fluid communication with the combustion power source (14) and includes a reciprocating gas piston (66) connected to a latch (80) in operational proximity to the valve sleeve (36). The lockout device (60) is configured such that upon combustion in the combustion chamber (18), gas from the combustion engages the gas piston (66) and moves the latch (80) to an engaged position in which the valve sleeve (36) is prevented from moving to the rest position.
Abstract:
According to the invention, the adapter is arranged to be mounted in the tool (1), to be connected to a fuel cartridge (7) and to receive fuel and communicate with a combustion chamber (5) so as to inject a mixture of external air and fuel therein.
Abstract:
A fuel cell adapter to be received in a combustion tool fuel cell cavity, the cavity having a predetermined diameter, and the adapter having a post extending longitudinally along an axis. First and second platforms are positioned at a first and second end of the post and they extend laterally outwardly from the post to occupy a distance slightly less than the predetermined diameter of the fuel cell cavity. A flange extends from the post between the first and second ends of the post and has at least one portion extending laterally outwardly from the post to occupy a distance, when combined with the post, slightly greater than the predetermined diameter of the fuel cell cavity. The flange is formed of a resilient material and a thickness so as to permit the flange to be deformed as the adapter is inserted into the fuel cell cavity.
Abstract:
The tool comprises an inner combustion engine (2), in a housing (1), for propelling a piston for driving a fastening member, a casing (11) for receiving a fuel cell as a source of energy of the engine, a handle (8) for handling the tool, with a trigger (9) for actuating the tool and a casing for receiving a battery as the electrical supply source of the tool, the handle (8) being connected to the housing (1) of the engine, and extending substantially perpendicular to an axis (5) of the housing. On the side opposed to the housing (1) of the engine, the handle (8) is connected to an arm (13) for receiving the fuel cell and the electrical supply battery.
Abstract:
A fastener driving tool is capable of not only linearly driving but also rotationally fastening a fastener into a workpiece P. The fastener driving tool includes a housing 2, a nose portion 40 formed with an injection passage 40a through which a fastener 41 is driven, a magazine 4 accommodating fasteners 41 and supplying a fastener 41 to the nose portion 40, a push lever 5 movable relative to the housing 2 upon depression against the workpiece P, combustion chamber frames 12, 22 movable in the housing 2 in accordance with the movement of the push lever 5, and first and second cylinders 7, 8 fixed to the housing 2. First and second pistons 71, 81 are movably disposed in the first and second cylinders 7,8, respectively, and a bit 9 extends from the first piston 71. A rod 14 formed with a rack 14A extends from the second piston 72. The rack 14A is engageable with a motion conversion mechanism 6 for converting a linear motion of the rod 14 into rotational motion of the bit 9.