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 valv
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, the first piston (4) is arranged to compress air and transfer compressed air to the combustion chamber (10) via the transfer valve (8). The combustion chamber (10) is arranged to receive the compressed air from the priming cylinder (2) and fuel gas from the 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 the air/fuel mixture is ignited therein to impart motion onto the second piston (14) and to facilitate the operation of the tool.
대표청구항▼
The invention claimed is: 1. A hand-held power tool, the operational power of which is provided by a gas combustion mechanism, said gas combustion mechanism comprising a first priming cylinder having a first piston and an air intake valve, the priming cylinder being fluidally connected via a transf
The invention claimed is: 1. A hand-held power tool, the operational power of which is provided by a gas combustion mechanism, said gas combustion mechanism comprising a first priming cylinder having a first piston and an air intake valve, the priming cylinder being fluidally connected via a transfer valve to a combustion chamber that is connected to a second delivery cylinder including a second piston, wherein in use, said first piston is arranged to compress air and transfer the compressed air to said combustion chamber via said transfer valve, and said first piston is activated for more than one cycle before the compressed air is transferred to said combustion chamber, and said first piston is arranged to compress air to such a degree so as to impart a pressure in the combustion chamber of at least 0.3 bar, said combustion chamber is arranged to receive said compressed air, from the priming cylinder, and fuel gas from a fuel supply port, the air and fuel gas being mixed to form an air/fuel gas mixture therein, the combustion chamber and the second delivery cylinder being arranged so that said air/fuel mixture is ignited within the combustion chamber to impart motion onto said second piston and to facilitate the operation of the tool, wherein a mechanism movable between a first and a second position includes a latching means for engaging said second position, such that said air/fuel gas mixture is further compressed by said second piston as said mechanism is moved from said first to said second position with said latching means engaged and wherein the downward force from the ignition of said air/fuel mixture overcomes said latching means and imparts motion to said second piston. 2. The hand-held power tool as claimed in claim 1, wherein each of the compressed air and fuel are introduced in the combustion chamber at a predetermined time sequence that is optimized for particular power/time characteristics of the motion imparted to the second piston. 3. The hand-held power tool as claimed in claim 2, wherein fuel and compressed air are supplied simultaneously to said combustion chamber. 4. The hand-held power tool as claimed in claim 1, wherein said fuel supply port comprises a fuel injection jet, the jet being arranged for at least one actuation for an operating cycle of the power tool. 5. The hand-held power tool as claimed in claim 4, wherein said fuel injection jet is so shaped as to facilitate increased atomisation of the injected fuel so as to improve the mixing between air and fuel. 6. The hand-held power tool as claimed in claim 1, wherein said first piston is mechanically or electromagnetically actuated. 7. The hand-held power tool as claimed in claim 1, wherein said combustion chamber is spatially separate from said second delivery cylinder. 8. The hand-held power tool as claimed in claim 1, wherein said fuel supply port comprises a valve that is opened and closed via electromagnetic or mechanical actuation. 9. The hand-held power tool as claimed in claim 1, wherein said first piston has an internal receiver for storing pressurised air. 10. The hand-held power tool as claimed in claim 1, wherein a sealing ring having a semi-flexible lip is disposed around the periphery of said second piston. 11. The hand-held power tool as claimed in claim 1, wherein a mixing fan is rotatably mounted to the interior of said combustion chamber. 12. The hand-held power tool as claimed in claim 11, wherein an externally mounted motor drives said mixing fan via magnetic coupling. 13. The hand-held power tool as claimed in claim 1, wherein said combustion chamber is exhausted via a plate valve that fluidly connects said combustion chamber with an exhaust plenum when said plate valve is opened. 14. The hand-held power tool as claimed in claim 1, wherein a bumper is disposed near the bottom of said second delivery cylinder, such bumper arranged to be compressed by said second piston in the bottom of its travel and wherein the subsequent restoration of said bumper is further arranged to forcibly return said second piston back up said second delivery cylinder. 15. The hand-held power tool as claimed in claim 14, wherein the interior of said bumper forms a chamber arranged to port pressurised air via an outlet valve through a transfer channel to said first priming cylinder as said bumper is compressed. 16. The hand-held power tool as claimed in claim 1, the tool including more than one air and/or fuel intake valves. 17. The hand-held power tool as claimed in claim 1, the tool comprising a fastener driving means, the means comprising: a tool nose through which a fastener is fired; loading means for introducing said fastener into said tool nose; the arrangement being such that the motion of the second piston propels said fastener away from said tool nose. 18. The hand-held power tool as claimed in claim 17, wherein said fastener driving means is a nail gun.
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이 특허에 인용된 특허 (22)
Galka William E. ; Kitamura Yukio, Air and fuel delivery system for fuel injected engines.
Kellerman Rudolph J. (North Kingstown) Perra Arthur E. (Hope Valley) La Barre Leo E. (West Warwick) Lemos Walter G. (North Smithfield RI), Internal combustion actuated portable tool.
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