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...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 8065981 | Stratified scavenging two-cycle engine A stratified scavenging two-cycle engine that has a simpler structure than conventional stratified scavenging two-cycle engines and that has an excellent blow-by prevention effect etc. In an air intake stroke, lead air passes a lead-air port (12) etc. to flow... | 11/29/2011 |
| 7331315 | Two-stroke engine with fuel injection A two-stroke internal combustion engine is provided with a fuel injector. The two-stroke internal combustion engine may have at least one transfer passage, an air channel, and a fuel injector. The transfer passage is between a crankcase and a combustion chamber of t... | 02/19/2008 |
| 7299894 | Acoustic fluid machine An acoustic fluid machine includes an acoustic resonator, a valve device, a piston, and an actuator. The acoustic resonator has a larger-diameter base and a smaller-diameter upper end. The valve device is provided on the upper end of the acoustic resonator and has a... | 11/27/2007 |
| 7258087 | Air intake porting for a two stroke engine A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct t... | 08/21/2007 |
| 7255072 | Two-stroke internal combustion engine In a two-stroke internal combustion engine (1) using an internal cooling piston (2), the piston (2) has in-piston scavenging passages (19) defined therein by partition walls (18), and lower-end inlets (20) of the in-piston s... | 08/14/2007 |
| 7210432 | Internal combustion engine A two-stroke engine is for a portable handheld work apparatus such as a motor-driven chain saw, cutoff machine, brushcutter or the like. A combustion chamber (3) is configured in the cylinder (2) of the engine (1) and is delimited by a reciproca... | 05/01/2007 |
| 7146806 | Internal combustion engine cylinder and muffler assembly with catalytic converter A two cycle internal combustion engine cylinder having a piston chamber. The cylinder includes transfer ports; and an exhaust port divided into at least two sections. A first one of the sections has an aperture at the piston chamber with a top surface located closer... | 12/12/2006 |
| 7082910 | Two-stroke internal combustion engine Crankcase scavenged two-stroke internal combustion engine (1), in which a piston ported air passage is arranged between an air inlet (2) and the upper part of a number of transfer ducts (3, 3′). The air passage is arranged from an air inlet ( | 08/01/2006 |
| 7025021 | Two-stroke internal combustion engine Crankcase scavenged two-stroke internal combustion engine (1), in which a piston ported air passage is arranged between an air inlet (2) and the upper part of a number of transfer ducts (3, 3′). The air inlet is equipped with a restriction val... | 04/11/2006 |
| 7011071 | Internal boost system for engines An internal boost system integrated to an engine is provided which includes a blanking plate; a plenum chamber disposed within the oil sump having an exit flange disposed through a side of the oil sump; at least one one-way valve disposed through the blanking plate ... | 03/14/2006 |
| 6941906 | Crankcase scavenged internal combustion engine A crankcase scavenged internal combustion engine includes a cylinder and a piston reciprocating along the cylinder wall. At least one auxiliary duct is arranged with an auxiliary port in the cylinder wall. An inlet is divided into: a fuel inlet leading to a fuel por... | 09/13/2005 |
| 6662765 | Two-stroke internal combustion engine A two-stroke internal combustion engine which is capable of minimizing the quantity of blow-by or the quantity of air-fuel mixture to be discharged without being utilized for the combustion, of improving the fuel consumption and power of the engine, of re... | 12/16/2003 |
| 6564760 | Stratified scavenging two-cycle internal combustion engine A compact low emission, two-cycle, crankcase scavenged, spark ignited internal combustion engine with stratified scavenging is provided. The two-cycle engine including a cylinder block containing scavenging ports and a fresh air supply port. Said scavengi... | 05/20/2003 |
| 6257181 | Two-stroke engine having a ventilated transfer channel The invention relates to a two-stroke engine having a combustion chamber (3) configured in a cylinder (2). The combustion chamber is delimited by a piston (5) which moves upwardly and downwardly. The crankcase (4) is connected to the combustion chamber (3... | 07/10/2001 |
| 6240886 | Stratified scavenging two-cycle engine The present invention is a stratified scavenging two-cycle engine which can make exhaust gas cleaner. For this purpose, in a stratified scavenging two-cycle engine, which includes a scavenging flow passage (3) to connect a cylinder chamber (4a) and a cran... | 06/05/2001 |
| 6019080 | Ported piston A ported piston for increasing the cylinder displacement of internal combustion engines which includes, in a first embodiment, an inertia-activated wafer provided in a cavity located in the piston, with one or more ports connecting the bottom of the cavit... | 02/01/2000 |
| 5628295 | Two-stroke internal combustion engine This disclosure relates to a two-stroke engine comprising an engine frame forming a cylinder, and a piston mounted for reciprocating movement in the cylinder. The engine frame further includes a crankcase chamber and inlet flow passages for fresh mixture,... | 05/13/1997 |
| 5521000 | Polymer composite reed for a reed valve A polymer composite reed for a reed valve is provided, wherein the reed has improved mechanical properties as a result of its construction and is highly resistant to chemical and thermal attack. The improved mechanical properties of the reed are primarily... | 05/28/1996 |
| 5379732 | Continuously variable volume scavenging passage for two-stroke engines A variable volume transfer duct for maintaining an optimum volume of buffer gas in the transfer duct of a two-stroke engine during operation in order to minimize short circuit loss of fresh charge at all load levels during engine operation. The variable v... | 01/10/1995 |
| 5351659 | Shaft engine A shaft engine including a piston moved in a cylinder to reciprocate at least one cylinder shaft causing it to turn a crank shaft, the at least one cylinder shaft having a respective longitudinal air passage linked to either raised air chamber on the cyli... | 10/04/1994 |
| 5048473 | Method and apparatus for equipping a two-stroke engine which is self-supercharged by post-charging and in which an admission duct provides pre-exhaust into a storage chamber The invention relates to a method and apparatus for arranging a post-charging two-stroke engine. The apparatus includes a post-charging system (16) including an air admission duct (22) to the cylinder (14). The duct communicates intermittently either with... | 09/17/1991 |
| 4970769 | Method for producing cylinder having scavenging passages for two-cycle internal combustion engine A method for manufacturing a cylinder having scavenging passages for a two-cycle internal combustion engine is disclosed which comprises the steps of forming bulged portions protruded radially outwardly in a portion of a cylindrical liner, and surrounding... | 11/20/1990 |
| 4969425 | Piston with a resonant cavity The invention relates to a piston for a cylinder of a two-stroke internal combustion engine, the engine having an auxiliary air inlet port which communicates with a cavity within the crown structure of the piston as the piston passes through bottom dead c... | 11/13/1990 |
| 4964382 | Piston for two-cycle internal combustion engine The present invention provides a piston for a two-cycle internal combustion engine in which a hole is disposed at a position upwardly remote from a lower end of a skirt portion, which position corresponds to a position of an inlet port.... | 10/23/1990 |
| 4934345 | Two-cycle internal combustion engine A two-cycle internal combustion engine comprising a cylinder including an exhaust outlet and scavenging paths formed in the inner wall thereof, and a piston including openings formed in its peripheral wall at positions near respective piston-pin bosses th... | 06/19/1990 |
| 4829940 | Piston for two-cycle engines Several embodiments of cooling arrangements for the pistons of an internal combustion engine operating on a two-cycle, crankcase compression principle. The cooling arrangement comprises a passage that is formed in the piston and which communicates the por... | 05/16/1989 |
| 4809648 | Two-stroke engine having a central scavenging system Disclosed is a two-stroke engine having a central scavenging system through which the scavenging mixture, regulated into a single stream at a scavenging port provided in the top wall of the piston, jets upwardly into the center of the top portion of the c... | 03/07/1989 |
| 4706618 | Two stroke cycle internal combustion engine In a two stroke cycle internal combustion engine comprising a scavenged crankcase and a fuel injection nozzle (10), the formation of a more satisfactory mixture is desired and the use of a piston having smaller dimensions is to be permitted and this is to... | 11/17/1987 |
| 4627389 | Two-stroke internal combustion engine A two-stroke internal combustion engine is disclosed in which transfer of inlet air occurs from the aspiration chamber into the combustion chamber via channels running within the piston. The outer surfaces of the piston and the inner surfaces of the cylin... | 12/09/1986 |
| 4395978 | Fuel porting for two-cycle internal combustion engine Two-cycle internal combustion engines are disclosed incorporating intake and transfer ports and passages, and including intake porting at the sides of the cylinder in the regions of an axial plane through the cylinder containing the axis of the wrist pin ... | 08/02/1983 |
| 4378762 | Two-stroke internal combustion engine and method of operation thereof An internal combustion engine comprises a combustion chamber and a piston movable relative to the combustion chamber between top dead center and bottom dead center positions. A fuel transfer passage introduces fuel-air mixture into the combustion chamber ... | 04/05/1983 |
| 4340016 | Two-stroke internal combustion engine and method of operation thereof An internal combustion engine comprises a combustion chamber and a piston movable relative to the combustion chamber between top dead center and bottom dead center positions. A fuel transfer passage introduces fuel-air mixture into the combustion chamber ... | 07/20/1982 |
| 4329948 | Multiple port cylinder for crankchamber precompression type two stroke engines A cylinder for crankchamber precompression type two stroke engines includes three pairs of main scavenging ports which are symmetrical with respect to a longitudinal plane passing through the centers of the intake and exhaust ports and containing the long... | 05/18/1982 |
| 4296714 | Dual piston two stroke engine A two stroke internal combustion engine with at least one dual piston, the cylinders of which are connected to each other by a combustion chamber on the cylinder head side. The engine can be charged on the crank chamber side with an air or air/fuel mixtur... | 10/27/1981 |
| 4294201 | Internal combustion engines A two-stoke cycle combustion-engine with crank-chamber compression is described, free of charging transfer passages external to the cylinder, with pumping-displacement exceeding working-displacement for responsive intake and thorough scavenging of spent-g... | 10/13/1981 |
| 4248184 | Two-cycle diesel internal combustion engine An improved two-cycle Diesel internal combustion engine is provided, whereby the intake and exhaust port passages are modified to provide greater circulation of the combustible fluids and air during the intake and exhaust cycles of the Diesel engine, resp... | 02/03/1981 |
| 4167160 | Two cycle loop scavenging engine having unequal scavenging passage openings A two cycle loop scavenging engine of the crankcase precompression type having a pair of equally dimensioned scavenging passages 14, 16 disposed in a cylinder block 10 behind an apertured cylinder line 12. The passages are symmetrically positioned on oppo... | 09/11/1979 |
| 4161163 | Two cycle internal combustion engine A two-cycle internal combustion engine having reed-type intake valving, and specially configured and positioned intake and injector porting, with the porting constructed and arranged to improve various of the operating characteristics of the engine, and p... | 07/17/1979 |
| 4135479 | Piston and cylinder for two-cycle engines A piston and cylinder for two-cycle engines wherein the fuel-air mixture is precompressed in the crankcase and flows to the combustion chamber through transfer passages formed in the cylinder wall and under the control of the piston movement. The piston s... | 01/23/1979 |
| 4091775 | Two-stroke internal combustion engine The intake ports of the combustion chambers of two alternately-operating cylinders of a two-stroke internal combustion engine are connected by a conduit which sets up temporary communication between the two cylinders. In operation, while the piston of one... | 05/30/1978 |
