Pair Of Power Elements Patents (Class 74/490.1)
  • Patent number: 9108317
    Abstract: A manipulation device for manipulating and/or processing a workpiece includes a first motion unit for generating a linear motion of a first component and a second motion unit for generating a linear motion of a second component. The motion units are arranged relative to each other such that the motions that can be generated by the motion units are aligned parallel to each other. The first and second components are connected via first and second hinge joints, respectively, to a fastening element that is suitable for receiving a workpiece and/or a tool. The first and second hinge joints comprise first and second guide arms, respectively, which are coupled to the first and second components, respectively, via revolute joints. The first and second guide arms are coupled directly or indirectly to each other by at least one revolute joint so as to be pivotable relative to each other.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: August 18, 2015
    Assignee: WEISS GMBH
    Inventors: Uwe Weiss, Joseph Aleida Mathieu Maria Pinxt, Thomas Sarbach, Thomas Hess
  • Patent number: 9003919
    Abstract: A ceiling-mounted SCARA robot includes: a base, a first arm that is connected to the lower side of the base via a first coupling part centering around a first articulated shaft and that can pivotally move around the first articulated shaft within a horizontal plane, a second arm that is connected to the lower side of the first arm via a second coupling part centering around a second articulated shaft and that can pivotally move around the second articulated shaft within a horizontal plane, a working shaft that is mounted on the second arm, a second articulated shaft motor and a second articulated shaft reducer for driving the second arm, and a working-shaft rotation motor that rotates the working shaft. The second articulated shaft reducer is provided on the second coupling part, and the working-shaft rotation motor is arranged directly below the second articulated shaft reducer.
    Type: Grant
    Filed: September 3, 2010
    Date of Patent: April 14, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshitaka Kumagai, Mitsuhiro Fukatsu
  • Patent number: 8876077
    Abstract: A spherical orienting device includes a base, first and second actuation shafts, an orientable device, an inner member, a middle member, and an outer member. The first and second actuation shafts are rotatably held by the base for rotary actuation about first and second actuation axes, respectively, which intersect orthogonally at a spherical center of rotation. The orientable device is supported by first and second revolute support joints which are disposed for rotation about an orientation axis of the orientable device and a support axis, respectively. The inner member is fixed to the first actuation shaft and linked to the second support joint. The middle member is inwardly linked to the first support joint and outwardly linked to a middle revolute joint disposed for rotation about a linkage axis. The outer member is fixed to the second actuation shaft and linked to the middle revolute joint.
    Type: Grant
    Filed: May 14, 2010
    Date of Patent: November 4, 2014
    Assignee: Robert Bosch GmbH
    Inventor: Patrick Maillard
  • Patent number: 8621955
    Abstract: A robot arm assembly includes a first robot arm and a second robot arm rotatably connected to the first. The first robot arm includes a first input shaft and a second input shaft. The second robot arm includes a sleeve and an output shaft partially received in the sleeve. The sleeve of the second robot arm is rotated relative to the first robot arm via a pair of bevel gears. The output shaft is rotated relative to the sleeve via a plurality of bevel gears which cooperatively form a polygon.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: January 7, 2014
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventor: Bo Long
  • Patent number: 8601900
    Abstract: A support mechanism for a robot includes a support member, and a fixing member. The fixing member is placed on the support member, and includes a V-shaped resilient clip with a fixing groove. A robot securely configured with the support mechanism is also provided when the robot is being transported or stowed when not in service.
    Type: Grant
    Filed: May 27, 2011
    Date of Patent: December 10, 2013
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventors: Hua-Shuai Wang, Yong Feng
  • Publication number: 20130145890
    Abstract: A return to neutral mechanism is provided for hydraulic apparatuses such as motors/pumps that utilize a swashplate and a trunnion arm to control flow. The return to neutral mechanism includes two rotating brackets which have ends aligned to a single plane. Two springs are utilized and attached to the ends of the two rotating brackets giving the force mechanism the ability apply the force in a direct path, reducing friction, increasing life, and improving accuracy. This design is an “x” type mechanism, the force arms are in-line and do not cross, the force is applied equally on both sides of the fulcrum and therefore balanced.
    Type: Application
    Filed: December 12, 2012
    Publication date: June 13, 2013
    Applicant: PARKER-HANNIFIN CORPORATION
    Inventor: Parker-Hannifin Corporation
  • Patent number: 8429998
    Abstract: A moveable linkage for a parallel mechanism includes a swing arm, a four-link structure rotatably connected to the swing arm, and a plurality of pivotal shafts. The four-link structure includes a first connection shaft, a second connection shaft, a first link bracket and a second link bracket. Each of the first and second link brackets includes a first end portion and a second end portion. The first end portions of the first and second link brackets overlap and rotatably connect two ends of the first connection shaft by the pivotal shafts. The second end portions of the first and second link brackets overlap and rotatably connect two ends of the second connection shaft by the pivotal shafts.
    Type: Grant
    Filed: December 16, 2009
    Date of Patent: April 30, 2013
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventor: Yong Feng
  • Patent number: 8256320
    Abstract: A device for handling and/or performing work operations on objects comprises: at least a first arm (2) comprising a first end (2a) for supporting a tool (3) for moving or working; means for supporting and moving (4) the first arm (2) which comprise at least a first linear electric motor (5), developing on a closed path (P), for moving the first arm (2) along a circular trajectory (91), and at least a second linear electric motor (6), to which the first arm (2) is directly connected, developing in an arched trajectory (92). The first (5) and the second (6) linear electric motors cooperate to move the first arm (2).
    Type: Grant
    Filed: November 26, 2007
    Date of Patent: September 4, 2012
    Assignee: Motor Power Company S.R.L.
    Inventors: Paolo Mignano, Claudio Bianchini
  • Patent number: 8171818
    Abstract: A robot comprises a fixed body, a movable body, and a flat-shaped cable. The fixed body is at least unmovable in a vertical direction. The movable body is movably connected to the fixed body in a predetermined movable range in the vertical direction and has an end to which a tool is attached, the tool performing operations on a workplace. The cable bundle has a plurality of cables for electric power supply and control communication among the fixed and movable bodies and the tool. The cable bundle has two ends. One end is fixedly connected to a fixing position of the fixed body, while the other end is fixedly connected to a fixing position of the movable body which is equal to or higher than the position of the fixed body in the vertical direction in a state where the movable body is located at a highest highest position within the movable range of the movable body.
    Type: Grant
    Filed: November 12, 2008
    Date of Patent: May 8, 2012
    Assignee: Denso Wave Incorporated
    Inventor: Takamasa Tokumitsu
  • Patent number: 8167873
    Abstract: A robotic arm including a parallel spherical five-bar linkage with a remote center of spherical rotation. The robotic arm movably supports an endoscopic camera. Two outboard links are pivotally coupled together. At least one of the two outboard links supports the endoscopic camera. Two inboard links are respectively pivotally coupled to the two outboard links such that the two inboard links are able to cross over one another. The two inboard links moveably support the two outboard links. A ground link is pivotally coupled to the two inboard links. The ground link moveably supports the two inboard links.
    Type: Grant
    Filed: January 15, 2007
    Date of Patent: May 1, 2012
    Assignee: Intuitive Surgical Operations, Inc.
    Inventor: Bruce M. Schena
  • Patent number: 8167872
    Abstract: A robotic arm including a parallel spherical five-bar linkage with a remote center of spherical rotation. The robotic arm movably supports an endoscopic camera. Two outboard links are pivotally coupled together. At least one of the two outboard links supports the endoscopic camera. Two inboard links are respectively pivotally coupled to the two outboard links such that the two inboard links are able to cross over one another. The two inboard links moveably support the two outboard links. A ground link is pivotally coupled to the two inboard links. The ground link moveably supports the two inboard links.
    Type: Grant
    Filed: January 15, 2007
    Date of Patent: May 1, 2012
    Assignee: Intuitive Surgical Operations, Inc.
    Inventor: Bruce M. Schena
  • Patent number: 8162926
    Abstract: A robotic arm with a parallel spherical five-bar linkage having a ground link, two inboard links, and two outboard links. Each inboard link is coupled to the ground link at an axis of rotation and has an intermediate axis spaced apart from the axis of rotation. Each outboard link is pivotally coupled to one of the inboard links at the intermediate axis. The two outboard links are pivotally coupled together at an outboard axis. A constraint limits the rotation of a first one of the outboard links about the intermediate axis of the coupled inboard link such that a maximum angle between the links is substantially less than 180°. A second one of the outboard links and the coupled inboard link are constructed and assembled such that the two intermediate axes are on the same side of a plane including the outboard axis and one of the axes of rotation.
    Type: Grant
    Filed: January 15, 2007
    Date of Patent: April 24, 2012
    Assignee: Intuitive Surgical Operations Inc.
    Inventor: Bruce M. Schena
  • Patent number: 8142420
    Abstract: A robotic arm with a parallel spherical five-bar linkage having a ground link, two inboard links, and two outboard links. Each inboard link is coupled to the ground link at an axis of rotation and has an intermediate axis spaced apart from the axis of rotation. Each outboard link is pivotally coupled to one of the inboard links at the intermediate axis. The two outboard links are pivotally coupled together at an outboard axis. A constraint limits the rotation of a first one of the outboard links about the intermediate axis of the coupled inboard link such that a maximum angle between the links is substantially less than 180°. A second one of the outboard links and the coupled inboard link are constructed and assembled such that the two intermediate axes are on the same side of a plane including the outboard axis and one of the axes of rotation.
    Type: Grant
    Filed: January 15, 2007
    Date of Patent: March 27, 2012
    Assignee: Intuitive Surgical Operations Inc.
    Inventor: Bruce M. Schena
  • Patent number: 8136422
    Abstract: A multi-joint robot for loading/unloading a work into/from a cassette, which includes a hand part holding the work, an arm part rotatably holding the hand part, a link mechanism rotatably holding the base end side of the arm part and moving so that the moving route of the base end side of the arm part becomes linear in a direction roughly orthogonal to a direction for loading/unloading the work, and a driving device for moving the tip side of the arm part so as to linearly interpolate it in a direction for loading/unloading the work according to the movement of the link mechanism.
    Type: Grant
    Filed: April 11, 2006
    Date of Patent: March 20, 2012
    Assignee: Nidec Sankyo Corporation
    Inventors: Yasuyuki Kitahara, Shigeyuki Kaino
  • Patent number: 8079285
    Abstract: A robot includes a work tool, an arm, a cable, and a third member. The work tool is configured to perform a predetermined work with respect to a workpiece. The work tool is attached to the wrist. The arm supports the wrist and is rotatable around a rotational axis. The arm includes first and second members which are provided substantially in parallel to each other in a longitudinal direction of the arm to form a space between the first and second members. The cable extends through the space and is connected to the work tool. The third member connects the first and second members.
    Type: Grant
    Filed: July 7, 2009
    Date of Patent: December 20, 2011
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Ryuta Kagawa, Yoshiaki Miyazono, Takayuki Imanaka
  • Publication number: 20110192248
    Abstract: A nanopositioning system for producing a coupling interaction between a first nanoparticle and a second nanoparticle. A first MEMS positioning assembly includes an electro-static comb drive actuator configured to selectively displace a first nanoparticle in a first dimension and an electrode configured to selectively displace the first nanoparticle in a second dimensions. Accordingly, the first nanoparticle may be selectively positioned in two dimensions to modulate the distance between the first nanoparticle and a second nanoparticle that may be coupled to a second MEMS positioning assembly. Modulating the distance between the first and second nanoparticles obtains a coupling interaction between the nanoparticles that alters at least one material property of the nanoparticles applicable to a variety of sensing and control applications.
    Type: Application
    Filed: February 7, 2011
    Publication date: August 11, 2011
    Inventors: Omar Daniel LOPEZ, Gary Wiederrecht, David J. Gosztola, Derrick C. Mancini
  • Publication number: 20110146440
    Abstract: A manipulator arm mechanism includes a pivot shaft, a first arm, a second arm, and an actuator. The first arm includes a first end and a second end opposite to the first end. The second arm also includes a first end and a second end opposite to the first end. The pivot shaft is connected to the first end of the first arm, and the pivot shaft has a first axis. The first end of the second arm is rotatably connected to the second end of the first arm and rotates around a second axis, and an angle between the first axis and the second axis is between 0° to 180°. The actuator is connected to the second end of the second arm.
    Type: Application
    Filed: April 16, 2010
    Publication date: June 23, 2011
    Applicants: HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD., HON HAI PRECISION INDUSTRY CO., LTD.
    Inventor: YONG FENG
  • Patent number: 7816128
    Abstract: An automatic cell cultivation apparatus is provided which is capable of conveying the culture container, exchanging the culture medium, and operating other jobs promptly by a robot. The automatic cell cultivation apparatus has a cultivation apparatus main body for cultivating cells in a culture container, and the cultivation apparatus main body is equipped with one or more incubator accommodating the culture container, a chemical suction machine for sucking chemicals in the culture container, and a multijoint robot for conveying the culture container, the multijoint robot having functions of conveying the culture container, detaching and attaching the lid of the culture container, and inclining the container when sucking chemicals in the culture container, so that cell cultivation operations can be promptly carried out by only one robot.
    Type: Grant
    Filed: November 28, 2005
    Date of Patent: October 19, 2010
    Assignee: Kawasaki Jukogyo Kabushiki Kaisha
    Inventors: Katsumi Nakashima, Toshihisa Doi, Yohichi Nakamura
  • Patent number: 7640778
    Abstract: A servo drive system of a press machine includes a ram, an operation shaft which vertically moves the ram, and a servo motor which operates as a power source of the ram and which generates ram pressure using a torque based on at least one speed-torque characteristic of the servo motor. The operation shaft is directly driven using the servo motor. The at least one speed-torque characteristic of the servo motor is set in a manner such that a motor torque of the servo motor at which a capacity of electric energy supplied by a servo amplifier is determined becomes the motor torque at which an optimal punching pattern of the ram is generated from a light load to a heavy load according to a type of workpiece to be worked by the press machine.
    Type: Grant
    Filed: November 14, 2008
    Date of Patent: January 5, 2010
    Assignee: Amada Company, Limited
    Inventors: Kinshiro Naito, Tokuzo Sekiyama, Toshiaki Otake, Haruhiko Kuriyama
  • Patent number: 7637139
    Abstract: A continuous working system of a press machine includes a ram, an operation shaft which vertically moves the ram, and a servo motor which operates as a power source of the ram and which generates ram pressure using a torque based on at least one speed-torque characteristic of a motor. The operation shaft is directly driven using the servo motor. The operation shaft is continuously reciprocated and turned through an angle range corresponding to a distance between a predetermined lower end position required for press working by the ram and an upper end position such that the ram vertically moves between these positions by the servo motor, thereby subjecting a work to a continuous press working. The upper end position is set to a position slightly below a medium height of the entire vertically possible stroke of the ram. The lower end position is set to a position slightly above a bottom dead center of the entire vertically possible stroke of the ram.
    Type: Grant
    Filed: November 14, 2008
    Date of Patent: December 29, 2009
    Assignee: Amada Company, Limited
    Inventors: Kinshiro Naito, Tokuzo Sekiyama, Toshiaki Otake, Haruhiko Kuriyama
  • Patent number: 7475584
    Abstract: A servo drive system of a press machine has a pair of servo motors which can generate necessary ram pressure by compositing and using a torque based on the same speed-torque characteristics. The servo motors are symmetric with each other in a mirror image manner. The servo motors are opposed to each other at opposite ends of an operation shaft which vertically moves a ram. The servo motors are integrally operated, thereby directly driving the operation shaft.
    Type: Grant
    Filed: June 17, 2003
    Date of Patent: January 13, 2009
    Assignee: Amada Company, Limited
    Inventors: Kinshiro Naito, Tokuzo Sekiyama, Toshiaki Otake, Haruhiko Kuriyama
  • Publication number: 20080202273
    Abstract: A rotational motion-positioning apparatus capable of generating rotational movement about three orthogonal rotational axes. A first axial cam and second axial cam are supported by a rotational joint base. A rotational joint is attached between the rotational joint base and a work load support. The work load support has at least one first axial cam follower tracking first axial cam rotation, thus rotating the work load support about the rotational joint first rotational axis. The work load support has at least one second axial cam follower tracking second axial cam rotation, thus rotating the work load support about the rotational joint second rotational axis. The rotational joint base is supported by and rotatable about a housing, thus rotating the work load support about the third rotational axis. Three rotational drive unit are attached to the housing to rotate the first axial cam, second axial cam and rotational joint base.
    Type: Application
    Filed: February 23, 2007
    Publication date: August 28, 2008
    Inventor: Barry Lynn Wood
  • Patent number: 7334304
    Abstract: In order to improve a machine tool for machining a workpiece by a relative movement between the workpiece and a tool, comprising a first receiving device for the workpiece or the tool, a compound slide system with a second receiving device for the tool or the workpiece and comprising a drive device for moving the second receiving device in relation to the first receiving device, which drive device acts at at least two spaced-apart points of application by at least three drive struts extending parallel to at least two different directions and each with a pivot joint, and with which drive device the at least two points of application can be positioned by means of the at least three drive struts, in such a way that exact positioning of the second slide element can be achieved by structural measures, it is proposed that four drive struts of invariant length, each with a pivot joint, act on the slide element, each of which struts is pivotally connected to a guiding slide, which is guided in a linearly movable mann
    Type: Grant
    Filed: August 23, 2006
    Date of Patent: February 26, 2008
    Assignee: Index-Werke GmbH & Co. KG Hahn Tessky
    Inventor: Walter Grossmann
  • Patent number: 7284459
    Abstract: A system for positioning an object about a remote center of rotation. A non-movable part provides a stationary reference structure. A movable part moves relative to the non-movable part. A connector coupled between the movable part and the object positions the object adjacent the remote center of rotation and rotates it about the remote center of rotation responsive to movement of the movable part. Movement of the connector responds movement of the movable part. First and second force transmitting components coupled to the movable part move the movable part and the connector in first and second directions, respectively. Movement of the connector in the first direction rotates the object about a first axis passing through the remote center of rotation. Movement of the connector in the second direction rotates the object about a second axis passing through the remote center of rotation.
    Type: Grant
    Filed: December 5, 2003
    Date of Patent: October 23, 2007
    Assignee: Rensselaer Polytechnic Institute
    Inventor: Yves Bellouard
  • Patent number: 6910400
    Abstract: In a machine tool comprising a spindle mounting slide which is driven by a linear electric motor and which runs in a vertical direction in a slideway, the slide is equipped with a counterweighting device comprising an elastic element and a roller chain, the rigidity of the chain being less than the rigidity of the elastic element.
    Type: Grant
    Filed: September 6, 2001
    Date of Patent: June 28, 2005
    Assignee: Jobs S.p.A.
    Inventors: Maurizio Ferrari, Carlo Massari
  • Patent number: 6677691
    Abstract: A stage apparatus includes a table disposed above a base table so as to oppose to the base table, an X-axis-direction table support mechanism portion disposed between the base and the table for supporting the table in a state that the table is capable of moving in an X-axis-direction within a two-dimensional plane, a Y-axis-direction table support mechanism portion disposed between the base and the table for supporting the table in a state that the table is capable of moving in a Y-axis-direction within a two-dimensional plane, an X-axis-direction linear guide portion formed on an upper surface of the base and extending in the X-axis-direction, a Y-axis-direction linear guide portion formed on the upper surface of the base and extending in the Y-axis-direction, an X-axis direction movable member provided so as to move along the X-axis-direction linear guide portion and connected to the Y-axis-direction table support mechanism portion, a Y-axis-direction movable member provided so as to move along the Y-axis-d
    Type: Grant
    Filed: March 28, 2002
    Date of Patent: January 13, 2004
    Assignee: Minolta Co., Ltd.
    Inventor: Akimitsu Ebihara
  • Patent number: 6402444
    Abstract: This invention belongs to the manufacturing fields, specially relates to the structure design of a type of multi-function parallel machine tool driven by sliders and an extensible strut. It includes: two vertical (or one horizontal) guide ways, two active sliders mounted on guide ways, two linear drive units used to move the active sliders, two struts, one movable platform to assemble cutter, one workbench to fix workpiece, one salve slider and one controlled extensible strut. Compared with traditional machine tools, this invention possesses several advantages such as simpler structure, better cutter dexterity, faster cutter feed rate, higher accuracy, and better thermal effect calibration.
    Type: Grant
    Filed: March 3, 2000
    Date of Patent: June 11, 2002
    Assignee: Tsinghua University
    Inventors: Jinsong Wang, Guanghong Duan, Xiaoqiang Tang
  • Publication number: 20020053251
    Abstract: An interface component for a positioning system. The interface component includes a positioning arm having a first end and a second end, the first end being positionable against an object to be positioned and the second end being attachable to an actuator arm of the positioning system, and a damping element operably connected in parallel with the positioning arm.
    Type: Application
    Filed: September 18, 2001
    Publication date: May 9, 2002
    Inventors: Marc Bernard, Eduardo Coca
  • Patent number: 6328510
    Abstract: A machine tool for triaxial machining of work pieces with a machine rack. Couplers run on slewable bearings and being adjustable in an X-Y plane. These couplers are joined with a hinge. The machine tool is equipped with a tool carrier arranged at one coupler. The tool carrier is provided with a skid independently movable in X-Y-plane. The machine tool is equipped with independent drives for adjustment of the couplers. The machine tool which distinguishes itself by a simple and compact structure as well as by high stiffness of the coupler system in that at least two couplers (8,9) are run on bearings at two skids (4,5) which are adjustable in rack-proof guides by the aid of one drive each. The guides are mainly arranged in parallel to each other and with the couplers—if viewed in the projection on a X-Y plane—lying between the guides.
    Type: Grant
    Filed: September 28, 1998
    Date of Patent: December 11, 2001
    Assignee: Hüller Hille GmbH
    Inventors: Georg Hanrath, Gerald Stengele
  • Publication number: 20010041129
    Abstract: An articulated robot comprises a movable first transferring portion and a second transferring portion movably supported in relation to the movable first transferring portion by a joint portion. A workpiece is positioned at a position, where a workpiece positional deviation detecting means is located, by a hand portion formed at an end of the second transferring portion. The workpiece positional deviation detecting means detects the amount of deviation in the position of the workpiece. A positioning portion of the workpiece and a sensor portion for detecting deviations of the workpiece are formed either at the first transferring portion of the second transferring portion which form the articulated robot. A detecting operation by the sensor portion and transferring of the first and second transferring portions are enabled when the workpiece is positioned at the positioning portion of the articulated robot.
    Type: Application
    Filed: October 16, 1998
    Publication date: November 15, 2001
    Applicant: Sankyo Seiki Mfg. Co., Ltd.
    Inventors: HARUHIRO TSUNEDA, YASUYUKI KITAHARA
  • Patent number: 6230580
    Abstract: A manipulator includes a first arm having a first reduction gear unit built therein, a second arm fitted through the first arm and having a second reduction gear unit built therein, and a third arm fitted through the second arm and having a third reduction gear unit built therein. To avoid any possible interference between, for example, a welding torch, and a portion of the manipulator during operation of the manipulator, the drive axis of the third reduction gear unit is spaced apart a distance from a drive axis of the second reduction gear unit.
    Type: Grant
    Filed: June 19, 1997
    Date of Patent: May 15, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Seiji Iwai, Yasushi Mukai, Kazunori Matsumoto
  • Patent number: 6186458
    Abstract: A support arm has a support structure and an arm structure connected to the support structure through a pivotal connection for pivoting about a horizontal axis. A device is provided for adjusting the elevation of the arm structure by pivoting it about the horizontal axis. A support base is connected to the arm structure through a pivotal connection for pivoting relative to the arm structure about an axis that is parallel to the horizontal axis. A support member is connected to the support base through a pivotal connection for pivoting about a vertical pivot axis, and auxiliary structure such as an air extraction arm may be connected to the support member. A linkage between the support base and the support structure maintains the pivot axis of the support base parallel to a vertical axis as the elevation of the arm structure is adjusted, and avoids the auxiliary structure from swinging under the influence of gravity to a neutral position different from that desired by an operator.
    Type: Grant
    Filed: February 29, 2000
    Date of Patent: February 13, 2001
    Inventor: Henning Hansen