Patents by Inventor Bernhard Durr
Bernhard Durr has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7412959Abstract: A manually guided implement having a housing that accommodates an internal combustion engine for driving a tool. At least an upper handle extends in a longitudinal direction of the implement on an upper side thereof. A first antivibration element connects the handle to the housing, wherein a longitudinal central axis of the antivibration element is inclined relative to a longitudinal central plane of the implement.Type: GrantFiled: June 28, 2005Date of Patent: August 19, 2008Assignee: Andreas Stihl AG & Co. KGInventors: Günter Wolf, Bernhard Dürr
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Patent number: 7168132Abstract: The invention relates to a portable handheld work apparatus including a chain saw, a vacuum/blower apparatus or the like. The work apparatus has a handle (2) for carrying and guiding the work apparatus (1). Thumb supports (4, 5) are provided on both sides with respect to the longitudinal axis (3) of the handle (2).Type: GrantFiled: March 15, 2002Date of Patent: January 30, 2007Assignee: Andreas Stihl AG & Co.Inventors: Bernhard Dürr, Michael Tinius, Jörg Schlossarczyk, Günter Wolf, Martin Schif, Werner Geyer, Michael März, Jürgen Häberlein
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Patent number: 7131406Abstract: A two-cycle engine in a portable, manually-guided implement, such as a power chain saw, a cut-off machine, a brush cutter, or the like, is provided. The cylinder has a combustion chamber that is delimited by a reciprocating piston that via a connecting rod drives a crankshaft that is mounted in a crankcase so as to be rotatable about a crankshaft axis. The cylinder has an outlet for conveying exhaust gases out of the combustion chamber, with the outlet having an axis of the channel thereof. The cylinder also has an inlet for supplying a fuel/air mixture to the crankcase. By means of at least two transfer channels, the fuel/air mixture is conveyed out of the crankcase and into the combustion chamber, with the transfer channels being disposed symmetrically relative to the axis of the channel of the outlet.Type: GrantFiled: January 17, 2003Date of Patent: November 7, 2006Assignee: Andreas Stihl AG & Co.Inventors: Bernhard Dürr, Harald Schliemann, Jörg Schlossarczyk, Werner Geyer
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Publication number: 20060000438Abstract: A manually guided implement having a housing that accommodates an internal combustion engine for driving a tool. At least an upper handle extends in a longitudinal direction of the implement on an upper side thereof. A first antivibration element connects the handle to the housing, wherein a longitudinal central axis of the antivibration element is inclined relative to a longitudinal central plane of the implement.Type: ApplicationFiled: June 28, 2005Publication date: January 5, 2006Applicant: Andreas Stihl AG & Co. KGInventors: Gunter Wolf, Bernhard Durr
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Patent number: 6851403Abstract: A valve drive having a rocker arm mounted on a cylinder head is provided. One end of the rocker arm is actuated by a push rod to actuate a valve stem of a poppet valve that engages the other end of the rocker arm, which is pivotably held between its ends on a support pin that extends into the cylinder head, with a spherical mounting being provided between the support pin and the rocker arm. Provided on that side of the rocker arm remote from the cylinder head is a bolt head for adjusting the bearing spacing between the rocker arm and the cylinder head for adjusting valve play. To prevent unintended adjustment of the bolt head, the latter cooperates with a rotation preventing element that has an arresting portion that engages the bolt head, and a support portion that conveys the adjustment moment away.Type: GrantFiled: August 31, 2001Date of Patent: February 8, 2005Assignee: Andreas Stihl AG & Co.Inventors: Bernhard Dürr, Bruhns Imke, Jürgen Häberlein, Harald Schliemann, Jörg Schlossarczyk, Manfred Rabis
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Publication number: 20050025636Abstract: A pump system for conveying lubricating oil to a cutting chain of a chain saw is provided. The pump system comprises at least one first oil pump, wherein a quantity of oil being conveyed thereby is adjustable by an operator of the chain saw. The pump system also includes a basic oil pump that is connected in parallel to the adjustable oil pump.Type: ApplicationFiled: July 30, 2004Publication date: February 3, 2005Applicant: Andreas Stihl AG & Co., KGInventor: Bernhard Durr
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Patent number: 6749180Abstract: A diaphragm carburetor is provided for an internal combustion engine that operates with scavenging air, especially a two-cycle engine in a manually-guided implement. The carburetor has an intake channel portion in which is disposed a butterfly valve that is rotatably held via a shaft and in the vicinity of which fuel-supplying channels open into the intake channel portion. The channels are supplied from a fuel-filled regulating chamber that is formed on a longitudinal side of the intake channel portion in the carburetor housing and is separated by a regulating diaphragm from a compensation chamber. The carburetor has at least one air channel that supplies additional combustion air and that has an air valve that is rotatably held via a shaft.Type: GrantFiled: February 14, 2003Date of Patent: June 15, 2004Assignee: Andreas Stihl AG & Co. KGInventors: Bernhard Dürr, Manfred Rabis, Werner Geyer
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Patent number: 6736240Abstract: A cam drive is provided for a valve control of a mixture-lubricated internal combustion engine that has a cylinder, and a cylinder head in which is disposed a poppet valve which is actuated by a pivotable rocker arm. Mounted in a cam chamber is a control cam that is driven by the crankshaft of the engine and on the cam path of which rests a drag lever that transfers the cam lift to the rocker arm. To achieve a reliable mixture lubrication, a flow guidance element is disposed in the annular chamber between the peripheral wall of the cam chamber and the maximum diameter of the path of a cam nose. The flow guidance element is provided with a flow edge that is disposed adjacent to the drag lever in the vicinity of the path diameter of the cam nose.Type: GrantFiled: August 31, 2001Date of Patent: May 18, 2004Assignee: Andreas Stihl AG & Co.Inventors: Bernhard Dürr, Harald Schliemann, Manfred Rabis, Jörg Schlossarczyk
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Patent number: 6715212Abstract: A portable handheld work apparatus such as a motor-driven chain saw includes a housing (6) of a drive unit (2). The following are mounted in the housing (6): an internal combustion engine (3), a carburetor (4) for fuel metering and an air filter (5) as well as a fuel tank (8). The air filter (5) is mounted ahead of the carburetor in the flow direction of the fresh air flow. A largest possible filter action is obtained with a compact configuration in that a housing (10) of the air filter (5) lies at least partially in a space between the carburetor (4) and the fuel tank (8).Type: GrantFiled: June 6, 2002Date of Patent: April 6, 2004Assignee: Andreas Stihl AG & Co.Inventors: Bernhard Dürr, Harald Schliemann, Jörg Schlossarczyk, Manfred Rabis
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Publication number: 20030160340Abstract: A diaphragm carburetor is provided for an internal combustion engine that operates with scavenging air, especially a two-cycle engine in a manually-guided implement. The carburetor has an intake channel portion in which is disposed a butterfly valve that is rotatably held via a shaft and in the vicinity of which fuel-supplying channels open into the intake channel portion. The channels are supplied from a fuel-filled regulating chamber that is formed on a longitudinal side of the intake channel portion in the carburetor housing and is separated by a regulating diaphragm from a compensation chamber. The carburetor has at least one air channel that supplies additional combustion air and that has an air valve that is rotatably held via a shaft.Type: ApplicationFiled: February 14, 2003Publication date: August 28, 2003Applicant: Andreas Stihl AG & Co KGInventors: Bernhard Durr, Manfred Rabis, Werner Geyer
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Publication number: 20030136360Abstract: A two-cycle engine in a portable, manually-guided implement, such as a power chain saw, a cut-off machine, a brush cutter, or the like, is provided. The cylinder has a combustion chamber that is delimited by a reciprocating piston that via a connecting rod drives a crankshaft that is mounted in a crankcase so as to be rotatable about a crankshaft axis. The cylinder has an outlet for conveying exhaust gases out of the combustion chamber, with the outlet having an axis of the channel thereof. The cylinder also has an inlet for supplying a fuel/air mixture to the crankcase. By means of at least two transfer channels, the fuel/air mixture is conveyed out of the crankcase and into the combustion chamber, with the transfer channels being disposed symmetrically relative to the axis of the channel of the outlet.Type: ApplicationFiled: January 17, 2003Publication date: July 24, 2003Applicant: Andreas Stihl AG & Co.Inventors: Bernhard Durr, Harald Schliemann, Jorg Schlossarczyk, Werner Geyer
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Patent number: 6546905Abstract: A valve drive mechanism is provided for an internal combustion engine, especially a four-stroke engine in a power chain saw. The implement housing is spanned by a front handle, the tubular grip of which is adjacent to the cylinder head of the engine and extends from one longitudinal side of the implement to the other longitudinal side thereof. A rocker arm of a valve control is pivotably mounted on the cylinder head between the ends of the rocker arm, with the rocker arm being pivotable about a pivot axis disposed transverse to the rocker arm. Push rods of a control mechanism engage one end of the rocker arm to actuate a poppet valve, on the valve stem of which the other end of the rocker arm acts. To be able to guide the tubular grip close to the center of gravity of the implement, the longitudinal axis of the rocker arm is disposed approximately parallel to the adjacent portion of the tubular grip.Type: GrantFiled: August 31, 2001Date of Patent: April 15, 2003Assignee: Andreas Stihl AG & Co.Inventors: Bernhard Dürr, Harald Schliemann, Manfred Rabis
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Patent number: 6539911Abstract: A cam drive is provided for a valve-controlled mixture-lubricated internal combustion engine having a cylinder in which is formed a combustion chamber that is delimited by the cylinder wall, a piston and a cylinder head. Disposed in the cylinder head are poppet valves, the respective valve shafts of which are driven via a pivotable rocker arm from a valve control that includes a control cam on the surface of which rests a contact lever that transfers cam lift to one end of the rocker arm. To ensure good lubrication of the cam drive even at high speeds, the control cam is rotatably mounted in the vicinity of the cylinder wall, in which is formed a through-bore. The first open end of the through-bore is disposed in the cylinder bore at the level of the piston in its lower dead center position, while the second open end opens into the cam chamber in the vicinity of the control cam.Type: GrantFiled: August 31, 2001Date of Patent: April 1, 2003Assignee: Andreas Stihl AG & Co.Inventors: Bernhard Dürr, Harald Schliemann, Reinhard Friedrich, Manfred Rabis
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Publication number: 20020189110Abstract: A portable handheld work apparatus such as a motor-driven chain saw includes a housing (6) of a drive unit (2). The following are mounted in the housing (6): an internal combustion engine (3), a carburetor (4) for fuel metering and an air filter (5) as well as a fuel tank (8). The air filter (5) is mounted ahead of the carburetor in the flow direction of the fresh air flow. A largest possible filter action is obtained with a compact configuration in that a housing (10) of the air filter (5) lies at least partially in a space between the carburetor (4) and the fuel tank (8).Type: ApplicationFiled: June 6, 2002Publication date: December 19, 2002Inventors: Bernhard Durr, Harald Schliemann, Jorg Schlossarczyk, Manfred Rabis
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Publication number: 20020129502Abstract: The invention relates to a portable handheld work apparatus including a chain saw, a vacuum/blower apparatus or the like. The work apparatus has a handle (2) for carrying and guiding the work apparatus (1). Thumb supports (4, 5) are provided on both sides with respect to the longitudinal axis (3) of the handle (2).Type: ApplicationFiled: March 15, 2002Publication date: September 19, 2002Applicant: Andreas Stihl AG & Co.Inventors: Bernhard Durr, Michael Tinius, Jorg Schlossarczyk, Gunter Wolf, Martin Schif, Werner Geyer, Michael Marz, Jurgen Haberlein
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Patent number: 6422338Abstract: An exhaust gas muffler is provided for an internal combustion engine, especially for two-stroke engines of manually guided implements such as power chain saws, brush cutters or the like. The muffler has a housing that includes two shells. One of the shells is provided with at least one outlet opening for exhaust gas. A cover is provided that guides the exhaust gas, and the cover has at least one discharge opening for the discharge of exhaust gas to the surrounding air. An exhaust gas chamber is formed within the cover. A screen element is disposed in the vicinity of the at least one discharge opening such that the exhaust gas stream is guided through the screen element.Type: GrantFiled: June 1, 2000Date of Patent: July 23, 2002Assignee: Andreas Stihl AG & Co.Inventors: Johannes Menzel, Bernhard Dürr, Gerd Wöllhaf
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Publication number: 20020062805Abstract: A valve drive having a rocker arm mounted on a cylinder head is provided. One end of the rocker arm is actuated by a push rod to actuate a valve stem of a poppet valve that engages the other end of the rocker arm, which is pivotably held between its ends on a support pin that extends into the cylinder head, with a spherical mounting being provided between the support pin and the rocker arm. Provided on that side of the rocker arm remote from the cylinder head is a bolt head for adjusting the bearing spacing between the rocker arm and the cylinder head for adjusting valve play. To prevent unintended adjustment of the bolt head, the latter cooperates with a rotation preventing element that has an arresting portion that engages the bolt head, and a support portion that conveys the adjustment moment away.Type: ApplicationFiled: August 31, 2001Publication date: May 30, 2002Inventors: Bernhard Durr, Bruhns Imke, Jurgen Haberlein, Harald Schliemann, Jorg Schlossarczyk, Manfred Rabis
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Patent number: 6393835Abstract: The invention relates to an exhaust-gas muffler on an internal combustion engine in a motor chain saw. The exhaust-gas muffler includes a housing (1) which is assembled of two housing shells (2, 3). The one housing shell (2) has an exhaust-gas inlet (4) and the other housing shell (3) has an exhaust-gas outlet (5). An inner wall (8) as well as a catalytic converting element (7) are provided in the inner space (6) of the muffler housing (1). The catalytic converting element (7) is mounted between the exhaust-gas inlet (4) and the exhaust-gas outlet (5). In order to ensure an adequate catalytic converting treatment of the exhaust gas at low gas counterpressure, it is provided to divide the entering exhaust-gas flow (10) and to conduct at least one of these component flows (23) in contact with the catalytic converting element (7). The component flows (22, 23) are brought together and mixed with other before exiting from the muffler housing (1).Type: GrantFiled: April 6, 2001Date of Patent: May 28, 2002Assignee: Andreas Stihl AG & Co.Inventors: Gerhard Stoll, Wolf Burger, Gustav Wölpert, Thomas Rieger, Ronald Hotz, Bernhard Dürr
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Patent number: 6375171Abstract: The invention relates to a vibration damper between a housing (4), which holds an internal combustion engine, and a handle (3) fixed on the housing (4). The handle (3) is for holding and guiding the motor-driven chain saw (2) during use thereof. The vibration damper (1) is a coil spring (5) which is fixed at a first end (10) thereof with an attachment element (7) to the handle (3) and, at a second end (20), the coil spring is fixed with a further attachment element (30) to the housing. A part turn of the end (10, 20) of the coil spring (5) is held form-tightly to the attachment element (7, 30) in the direction of its longitudinal center axis (25). To provide a torsion-free assembly of the coil spring, it is provided that the coil spring (5) can be assembled from one of its ends (20) between the handle (3) and the housing (4) and be secured at least at one of its ends (20) to the attachment element (30) against a rotational movement in the peripheral direction.Type: GrantFiled: September 8, 2000Date of Patent: April 23, 2002Assignee: Andreas Stihl AG & Co.Inventors: Helmut Zimmermann, Horst Otterbach, Bernhard Dürr, Manfred Rabis, Karl-Heinz Klöpfer, Klaus Martin Uhl, Günter Wolf, Rebekka Helfen
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Patent number: 6363618Abstract: A manually guided, portable implement, especially a power saw, is provided. The implement has a cylinder and a crankshaft that is connected to a piston via a piston rod. The implement has an essentially plastic housing as well as a lower crankcase. A stabilizing plate is nearly entirely embedded in the material of the lower crankcase. The one-piece stabilizing plate is provided with support sockets for bolting the lower crankcase to the cylinder. An overall metallic screw connection can thus be established.Type: GrantFiled: March 3, 2000Date of Patent: April 2, 2002Assignee: Firma Andreas Stihl AG & Co.Inventor: Bernhard Dürr