Patents Assigned to Andreas Stihl AG & Co. KG
  • Patent number: 10406716
    Abstract: The invention relates to a chipper chain (10) for a motor-driven chain saw (9) as well as a chain saw having such a chipper chain (10). The chipper chain (10) includes drive links (1), connecting links (2), and cutting links (3). The drive links (1) each have a drive projection (4). The cutting links (3) each have an upper cutting blade (5) and a depth limiter (6) which leads the upper cutting blade (5). The chipper chain (10) has a maximum width (A) which is defined by the upper cutting blades (5), a maximum height (C) which is measured perpendicularly to its longitudinal axis and extends from the drive projection (3) to the upper cutting blade (5), and an average divide (T) predetermined by the average distance of adjacent pivot pins (7). The product of the maximum width (A), the maximum height (C), and the average divide (T) is ?450 mm3. The driving power of the motor-driven chain saw (9) is ?1.0 kW.
    Type: Grant
    Filed: January 28, 2011
    Date of Patent: September 10, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Jan Föhrenbach, Jochen Buchholtz, Alexander Fuchs, Klaus Dussler
  • Patent number: 10401437
    Abstract: A circuit arrangement is for determining the cell voltage of an individual cell in a cell grouping of a series circuit of individual cells of an accumulator pack. Potential points are formed between electrically adjacent individual cells of the series circuit. The potentials of the potential points which follow one another in the series circuit increase in absolute value starting from a reference potential. Each potential point is connected to a measuring input of an evaluation device via a measuring resistor and a switch. In order to measure the cell voltage of an individual cell, the measuring input is connected to the reference potential via a capacitor. The evaluation device registers the charging time of the capacitor to a predefined voltage. On the basis of the registered charging time, the evaluation device determines the cell voltage of the measured individual cell.
    Type: Grant
    Filed: January 30, 2017
    Date of Patent: September 3, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Martin Schurr, Gernot Liebhard, Christian Heigemeyr, Markus Kulzer
  • Patent number: 10371044
    Abstract: A work apparatus having a work tool and having a combustion engine which drives the work tool has a start enrichment device for the combustion engine and a braking arrangement for the work tool. The work apparatus has an operating mode selector for actuating the start enrichment device. The start enrichment device actuates the braking arrangement in at least one start position. Low actuating forces and a simple configuration are achieved when the braking arrangement is a differential band brake.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: August 6, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventor: Carel Karrar
  • Patent number: 10357099
    Abstract: A back carrier has a back plate and a shoulder strap. The back plate has a longitudinal extent and, in the direction of its longitudinal extent, has an upper and a lower end section. The upper end section reaches as far as the upper end of the back plate. The strap extends on the back side of the back plate, which faces toward the back of a user. The strap is fastened with a first strap section in the area of the upper end section to an upper fastening location and is fastened with a second strap section in the area of the lower end section to a lower fastening location. In the area of the upper end section, the back plate has a recess for receiving an extension plate. In the direction of the longitudinal extent, the recess is open toward the upper end of the back plate.
    Type: Grant
    Filed: August 10, 2017
    Date of Patent: July 23, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Jens Riehmann, Markus Zeller, Harald Schliemann
  • Patent number: 10344707
    Abstract: A piston for a two stroke engine which operates with advanced scavenging has a piston base and a piston skirt. The center axis of the piston skirt forms a longitudinal center axis of the piston. The piston has two piston pin eyes, in which piston pin receptacles are configured. The center axis of the piston pin receptacles forms a transverse axis of the piston. The piston has at least one piston pocket. At least one piston pin eye is connected via at least one connecting rib to the piston skirt. Here, the connecting rib runs on that side of the piston pocket which faces away from the piston base.
    Type: Grant
    Filed: August 21, 2017
    Date of Patent: July 9, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Birger Loew, Jonas Lank
  • Patent number: 10337458
    Abstract: A carburetor has a housing wherein a control drum is rotatably mounted. A section of an intake channel is formed in the carburetor. A subsection of this section is formed in the control drum. The control drum controls the free flow cross section of the intake channel. A fuel opening is connected to a fuel chamber via an unbranched fuel channel which opens into the subsection of the intake channel. A simple configuration of the carburetor is achieved by the carburetor including an electrically actuated valve which controls the flow of fuel through the fuel channel. For a method for operating an internal combustion engine with a carburetor, a temperature (T) is determined before or during the starting of the engine and that the flow of fuel through the fuel channel during the starting of the engine is controlled in dependence upon the temperature (T).
    Type: Grant
    Filed: February 5, 2016
    Date of Patent: July 2, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Michael Raffenberg, Antonio Fattorusso, Isgard Sabelberg
  • Patent number: 10329994
    Abstract: A power tool has an internal combustion engine with an injection valve through which fuel is supplied to the internal combustion engine; a crankcase; and a crankshaft arranged in the crankcase so as to be rotatable about an axis of rotation. A fan wheel housing is provided and a fan wheel is arranged in the fan wheel housing and conveys cooling air to the internal combustion engine. In the fan wheel housing a connecting opening is formed. The injection valve is arranged in a cooling area, wherein cooling air is supplied by the fan wheel through the connecting opening to the cooling area.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: June 25, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Martin Rieber, Thorsten Schäffer, Jens Riehmann, Arno Kinnen, Volker Donner
  • Patent number: 10330038
    Abstract: The invention relates to a method for adapting the composition of a mixture of fuel and combustion air. The mixture is supplied to a combustion chamber of a mixture-lubricated combustion engine in a work apparatus. The fuel is supplied to the combustion engine via a controlled fuel valve. In an operating state (I) of the combustion engine, the quantity of fuel is metered by the fuel valve. For the purpose of adapting the composition of the mixture, the combustion engine is shifted into a special operating state (II) which differs from the normal operating state (I). After starting, the combustion engine is operated in a first rotational speed range (B) for a prespecified operating time (Tmin), wherein, after the prespecified operating time (Tmin) has elapsed, the operating state (II) for adapting the composition of the mixture is initiated by a prespecified user action.
    Type: Grant
    Filed: February 1, 2018
    Date of Patent: June 25, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Andreas Baehner, Michael Dietenberger, Martin Kiesner, Florian Hoche, Klaus Geyer, Steffen Bantle, Friedrich Hollmeier, Frederik Herrmann, Jochen Gantert, Karsten Schmidt
  • Patent number: 10322519
    Abstract: A hand-guided power tool has a power tool housing and an internal combustion engine arranged in the power tool housing and configured to drive a tool member of the power tool. A fuel tank and at least one electric component are provided. A control device that is an electronic control unit is connected to the at least one electric component of the power tool and controls the at least one electric component. The power tool has a top face which, when parking the power tool in a usual parking position on a flat horizontal support surface, is facing upwardly. The electronic control unit is positioned laterally adjacent to the fuel tank device, when viewing the power tool in the usual parking position.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: June 18, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Günter Wolf, Jan Kurzenberger, Holger Vollmer, Marcel Förster, Ulrich Kapinsky
  • Patent number: 10309362
    Abstract: A starter device for an internal combustion engine has an entrainer for coupling to the engine. The entrainer and an actuator of the starter device are mounted rotatably about a rotational axis. A damper spring is arranged between and operatively connects the entrainer and the actuator to each other. The starter device has at least one stud, on whose outer periphery the damper spring is mounted. The damper spring is a hinge spring wound from a spring wire. The cross section of the spring wire is rounded on the inner side of the spring wire. At least a portion of the cross section runs linearly on the outer side of the spring wire.
    Type: Grant
    Filed: January 29, 2016
    Date of Patent: June 4, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Patrick Behringer, Sven Keller, Werner Vonderau
  • Patent number: 10307930
    Abstract: A guide bar for a saw chain includes an elongate, flat base body made of a basic material. The base body extends along a longitudinal center axis and, in order to guide a saw chain, has a running surface formed on an outer periphery thereof and a guide groove formed in the outer periphery of the base body. The guide groove has a groove base. A direction-reversing section for the saw chain is provided at one end of the base body. The direction-reversing section includes at least one add-on component having a running surface made of more wear-resistant material than the basic material of the base body. The add-on component is secured to the base body of the guide bar by at least one weld seam. The weld seam extends between the add-on component and the base body and is located spatially beneath the groove base.
    Type: Grant
    Filed: August 21, 2014
    Date of Patent: June 4, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Alexander Fuchs, Thomas Voigt, David Mitrega, Matthias Schulz, Thomas Lux, Oliver Gerstenberger, Jochen Buchholtz, Berthold Schell, Norbert Apfel, Bernd Hein, Ruediger Ludwig, Jan Foehrenbach
  • Patent number: 10302142
    Abstract: A power tool is provided with a drive motor and a tool unit with a tool driven by the drive motor. A guide tube with telescoping section with external and internal tubes is provided, wherein the internal tube is longitudinally slidable within the external tube. A clamping device secures the internal tube relative to the external tube and has a clamping member supported rotatably relative to the internal tube and connected by a thread connection to the external tube. The clamping device is provided with a clamping ring with an opening arranged about an outer circumference of the internal tube. Compression of the clamping ring in longitudinal guide tube direction effects a size reduction of the clamping ring opening. The clamping ring has a first axial face supported relative to the external tube and a second axial face supported relative to the clamping member.
    Type: Grant
    Filed: February 10, 2016
    Date of Patent: May 28, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Gerd Densborn, Jan Föhrenbach, Benjamin Barth
  • Patent number: 10293445
    Abstract: A handheld work apparatus has an electric motor and a voltage source for operating the motor. A manual actuation element provided on a handle of the apparatus is operated by a user and is provided for activating the motor. The actuation element is connected to a control unit which controls the energy supply from the source to the motor as a function of an operating signal of the actuation element. If the control unit is in a blocking state, the energy supply to the motor is blocked independently of the operating signal of the actuation element. After receiving a control signal, the control unit switches from the blocking state to a standby state to release an energy supply to the motor. The control signal is derived from a combination of an actuation stroke and an actuation time (?TB) of the actuation element. A method for activating the apparatus is also disclosed.
    Type: Grant
    Filed: September 15, 2016
    Date of Patent: May 21, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Oliver Gerstenberger, Florian Hoche, Kay-Steffen Gurr, Fabian Gwosdz
  • Patent number: 10267220
    Abstract: A portable work apparatus has a drive motor and a housing which is formed at least partially by a housing part. The work apparatus has an operating fluid tank which is formed separately from the housing part and which has a cavity for receiving operating fluid. The operating fluid tank has a first portion which is arranged in a receptacle of the housing part, and a second portion which at least partially delimits the cavity and which protrudes from the receptacle. Provision is made for the operating fluid tank to be fixed to the housing part by at least one fastener, and for the receptacle to be delimited at least partially by a plurality of ribs of the housing part that are arranged at a spacing (f) from one another.
    Type: Grant
    Filed: July 12, 2016
    Date of Patent: April 23, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Thomas Hilt, Klaus Prach, Thomas Stark
  • Patent number: 10240568
    Abstract: A manually actuated feed pump is provided with a primer bulb to be manually actuated by an operator. The primer bulb has a pump chamber. A travel-controlled valve connects the pump chamber to a fuel line. The travel-controlled valve has a valve member that is moved by an actuation travel of the primer bulb into an open position that opens the travel-controlled valve. A first spring is operatively connected to the valve member and to the primer bulb. The primer bulb acts through the first spring on the valve member.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: March 26, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Michael Dietenberger, Ulf Bannick, Isgard Sabelberg, Tobias Deigendesch
  • Patent number: 10240558
    Abstract: A piston for a two-stroke engine operating with advanced scavenging has a piston base and a piston skirt. The piston has a piston pocket which has a smallest distance (e) from a top side of the piston base. The piston has a section plane perpendicularly to the longitudinal center axis of the piston, the distance of which section plane from the top side of the piston base is greater than the smallest distance (e). A middle plane of the piston intersects the piston skirt at a location. In the circumferential direction between the pocket and this location, a thickened area is arranged in the section plane, the greatest wall thickness of which area is at least 1.1 times the wall thickness at the location. The piston has an edge at a recess at which the piston skirt has a reduced height. A chamfer is arranged on the radially outer side of the piston.
    Type: Grant
    Filed: August 21, 2017
    Date of Patent: March 26, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Birger Loew, Jonas Lank
  • Patent number: 10233880
    Abstract: A suction head for connection to a fuel hose in a fuel tank has a base member made of an injection molding material. The base member has a peripheral wall surface provided with cutouts and also has an end face opening. A cap closes off the end face opening. A connecting socket for the fuel hose is provided on the suction head. A first filter element is received inside the base member. A second filter element covering the cutouts is provided and is made of a filter fabric, wherein the filter fabric is a twill weave fabric or a satin weave fabric. The filter fabric has a mesh size that is greater than 10 ?m and smaller than 25 ?m. A power tool with a four-stroke engine is provided with such a suction head in the fuel tank.
    Type: Grant
    Filed: October 10, 2017
    Date of Patent: March 19, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Jens Riehmann, Harald Schliemann, Manuel Dangelmaier
  • Patent number: D841906
    Type: Grant
    Filed: October 11, 2017
    Date of Patent: February 26, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventor: Andreas Weinberg
  • Patent number: D846960
    Type: Grant
    Filed: December 2, 2016
    Date of Patent: April 30, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventor: Michael Tinius
  • Patent number: D850582
    Type: Grant
    Filed: October 11, 2017
    Date of Patent: June 4, 2019
    Assignee: Andreas Stihl AG & Co. KG
    Inventor: Andreas Weinberg