Automatic Control Of Power Operated Means Patents (Class 173/2)
  • Patent number: 7823465
    Abstract: A bolt is fastened up to a predetermined snug torque Ts and then the bolt is further fastened by a specified angle ?t from a bolt angle corresponding to the snug torque Ts. Herein, in order to obtain excess and deficiency of the fastening angle up to the snug torque Ts, an angle-variation difference between the fastening angle ?sb of the bolt at the point where the fastening torque of the bolt has reached the snug torque Ts and a standard angle ?sa of the snug torque Ts is calculated. And, addition of this angle-variation difference to a base angle is set as the new specified angle ?t to correct the excess and deficiency. Accordingly, variation in a fastening shaft force can be restrained even if the snug torque is set at a relatively high torque in the bolt fastening method using the torque+angle method.
    Type: Grant
    Filed: August 12, 2008
    Date of Patent: November 2, 2010
    Assignee: Mazda Motor Corporation
    Inventors: Tatsumi Makimae, Yutaka Fujii
  • Publication number: 20100263891
    Abstract: An improved method is provided for controlling a power tool having a rotary shaft. The method includes: disposing an inertial mass in a housing of the power tool, such that the inertial mass is freely rotatable about an axis of rotation which is axially aligned with the rotary shaft; monitoring rotational motion of the power tool in relation to the inertial mass during operation of the power tool; and activating a protective operation based on the rotational motion of the power tool in relation to the inertial mass.
    Type: Application
    Filed: April 22, 2010
    Publication date: October 21, 2010
    Applicant: Black & Decker Inc.
    Inventors: David A. Carrier, Daniel Puzio, Robert Bradus
  • Publication number: 20100229691
    Abstract: A power wrench includes a housing divided into two parts which are rotatable relative to each other: a first part including a handle and a transverse section lodging a rotation motor, and a second part including a reduction gearing, an output shaft and a rigidly attached and laterally extending reaction bar. A swivel connection is provided between the housing parts and includes an angle sensor arranged to generate signals in response to relative angular movements between the housing parts, and a power control unit communicates with the angle sensor and is arranged to at least substantially reduce the motor power as a pre-set maximum angular movement between. the housing parts is exceeded as the motor is started.
    Type: Application
    Filed: October 15, 2008
    Publication date: September 16, 2010
    Inventors: Ulf Roland Brändström, Jan Thomas Hanspers, Erik Mikael Monsell
  • Patent number: 7777612
    Abstract: An apparatus and method for preventing theft in automotive vehicle service centers. The apparatus includes at least one portable tool and a controller. The portable tool includes circuitry configured to communicate with the controller. The portable tool further includes anti-theft circuitry, which is configured to disable the portable tool if no communication occurs between the portable tool and the controller for a predetermined time period.
    Type: Grant
    Filed: August 3, 2006
    Date of Patent: August 17, 2010
    Assignee: Midtronics, Inc.
    Inventors: William G. Sampson, John S. Philbrook
  • Patent number: 7770658
    Abstract: An object is to improve accuracy of tightening torque and to shorten time necessary for fastening a screw in an impact type screw fastening device that uses an electric motor as a rotation driving source. A control method for the impact type screw fastening device that uses an electric motor as a rotation driving source includes the steps of driving the motor to rotate by supplying current to the motor intermittently so that torque exerted on a load by rotation of the motor becomes like pulses on the time axis, and controlling the current of every time of each pulse so that an increment of every time of each pulse of the torque after the torque reaches a target approach torque TQN that is a first set value becomes smaller than that before it reaches the target approach torque TQN.
    Type: Grant
    Filed: May 10, 2006
    Date of Patent: August 10, 2010
    Assignees: Estic Corporation, Honda Motor Co., Ltd.
    Inventors: Takaya Ito, Yoshitsugu Shibata, Hitoshi Takamura
  • Publication number: 20100175902
    Abstract: The present invention relates to a method, with which an electric power tool is operated, which comprises a drive motor, a drive unit as well as a tool, the tool being operated by means of the drive unit and the drive motor. Said tool can be operated in at least two operating modes, said operating modes varying due to the properties of the drive motor and/or the drive unit. The setting of at least one of the two operating modes occurs automatically. The present invention furthermore relates to an electric power tool, which particularly can be operated with the one method according to the invention, having a drive motor, a drive unit as well as a tool, said tool being operable in at least two operating modes by means of the drive unit and the drive motor. The operating modes vary due to the properties of the drive motor and/or the drive unit.
    Type: Application
    Filed: January 7, 2010
    Publication date: July 15, 2010
    Applicant: Robert Bosch GMBH
    Inventors: Marcin Rejman, Wolf Matthias, Florian Schmehl, Thomas Heinrich, Simeon Staebler, Rainer Glauning
  • Publication number: 20100175903
    Abstract: An electric hammer comprising a hammer bit performing hammering work on a work, a drive motor, a hammering piece driven by the drive motor to apply a hammering force to the hammer bit, and a mechanism for damping vibration generated during hammering. The damping performance of the electric hammer is enhanced by causing the driving amount applied to the damping mechanism to vary between a first mode where the damping mechanism generates vibration of the hammer bit subjected to an external force from the work during the load driving time and thereby optimizes the damping and a second mode where the damping mechanism generates vibration corresponding to the vibration of the hammer bit not subjected to an external force from the work during the no-land driving time and optimizes damping.
    Type: Application
    Filed: March 23, 2010
    Publication date: July 15, 2010
    Applicant: MAKITA CORPORATION
    Inventors: Hiroki Ikuta, Yonosuke Aoki
  • Patent number: 7730963
    Abstract: An improved method is provided for controlling a power tool having a rotary shaft. The method includes: disposing an inertial mass in a housing of the power tool, such that the inertial mass is freely rotatable about an axis of rotation which is axially aligned with the rotary shaft; monitoring rotational motion of the power tool in relation to the inertial mass during operation of the power tool; and activating a protective operation based on the rotational motion of the power tool in relation to the inertial mass.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: June 8, 2010
    Assignee: Black & Decker Inc.
    Inventors: David A. Carrier, Daniel Puzio, Robert Bradus
  • Patent number: 7726412
    Abstract: A tightening tool for tightening a fastener is disclosed which comprises a motor and a main shaft that engages with the fastener. A clutch is disposed between the motor and the main shaft so that the clutch rotates the main shaft by transmitting torque from the motor to the main shaft when a load acting on the main shaft is less than a predetermined value. The clutch shuts off torque transmission from the motor to the main shaft when the load acting on the main shaft reaches or exceeds the predetermined value. When in use, the current flowing to the motor and rotation angle of the main shaft of the motor are detected. The detected current and rotation angle are used to determine whether the tightening torque of the fastener is normal.
    Type: Grant
    Filed: June 2, 2009
    Date of Patent: June 1, 2010
    Assignee: Makita Corporation
    Inventor: Yutaka Matsunaga
  • Patent number: 7721816
    Abstract: This invention relates to the control of a machine for performing drilling or bolting operation, such as in an underground mine. In one aspect, the invention comprises a system including an input device for manually controlling at least one aspect of the drilling or bolting operation and a controller associated with at least one neutral switch. An actuator actuates the drilling or bolting operation and includes a valve associated with the input device and the neutral switch. The input device is operative for controlling the drilling or bolting operation only when the valve is in a neutral position according to the neutral switch. Related input devices and methods are also disclosed.
    Type: Grant
    Filed: July 8, 2004
    Date of Patent: May 25, 2010
    Assignee: J.H. Fletcher & Co.
    Inventors: Henry E. Wilson, Craig M. Collins
  • Patent number: 7708085
    Abstract: A power tool includes an optical speed control switch for controlling the variable speed of an electrical motor in the tool. The tool includes a moveable member having a reflective surface and the moveable member traversing a distance between a stop position and a full speed position, a biasing member operatively coupled to the moveable member to bias the moveable member toward the stop position, an optical signal generator for generating an optical signal, the optical signal generator being oriented so that the optical signal is directed toward the reflective surface of the moveable member, and a speed control signal generator for generating a speed control signal that corresponds to a reflection of the generated optical signal reflected by the reflective surface of the moveable member.
    Type: Grant
    Filed: November 3, 2006
    Date of Patent: May 4, 2010
    Assignee: Robert Bosch GmbH
    Inventors: John DeCicco, Illya Kovarik, David Pozgay
  • Patent number: 7708083
    Abstract: A hand power tool has a percussion mechanism; a drive motor that drives the percussion mechanism; a conversion element for converting a movement of the drive motor into an axial movement; and an operating unit that adjusts a rotary movement of the conversion element within a percussion period depending on at least one optimization criterium.
    Type: Grant
    Filed: October 5, 2004
    Date of Patent: May 4, 2010
    Assignee: Robert Bosch GmbH
    Inventors: Friedmar Dresig, Joachim Hecht
  • Publication number: 20100096151
    Abstract: A portable power tool, wirelessly communicates with a stationary process control unit for exchange of operation parameter values, includes a housing with a battery powered motor connected to an output shaft, an on-board operation controller, and a wireless communication device in the form of a communication module. The communication module is received in a docking portion on the housing, and the docking portion and the communication module have matching electrical connectors. The communication module is one of a number of exchangeable communication modules all having identical electrical connectors for co-operation with the connection of the docking portion but which include communication devices for wireless communication according to different communication systems.
    Type: Application
    Filed: January 14, 2008
    Publication date: April 22, 2010
    Applicant: Atlas COPCO Tools AB
    Inventor: Carl Gunnar Östling
  • Publication number: 20100096155
    Abstract: An impact tool (100) includes a spindle (11), a motor (1), a rotational impact system (10), a current detecting unit (32), and a current control unit (31). The spindle extends in an axial direction thereof. The motor provides the spindle with a rotational power in accordance with a motor current flowing therethrough. The rotational power rotates the spindle about the axis at an rpm value. The rotational impact system provides the spindle with an impact force in the axial direction, thereby transmitting both the rotational power and the impact force to an end bit. The current detecting unit detects a current value of the motor current. The current control unit reduces the current value if the current value detected by the current detecting unit exceeds a predetermined value.
    Type: Application
    Filed: September 19, 2008
    Publication date: April 22, 2010
    Applicant: HITACHI KOKI CO., LTD.
    Inventors: Kazutaka Iwata, Shinji Watanabe, Nobuhiro Takano
  • Publication number: 20100089600
    Abstract: The invention relates to a power tool, which comprises a motor for driving a tool bit rotating, the motor attains a rotational speed, a source for supplying an electric current to said motor, a sensor for measuring said current, and a control device. The control device fulfills the task of detection of a variation of the slope of the current in the course of time, and generates a control signal. The rotational speed of the tool is reduced in response to the control signal. The present invention automatically detects whether the work piece operated by the tool bit reaches a predetermined position by providing electronic control means. It may make sure that the screw is driven into a piece of wood and does not go beyond the predetermined position once detect that the work piece reaches the position and carries out the changing action.
    Type: Application
    Filed: February 13, 2008
    Publication date: April 15, 2010
    Inventors: Gianni Borinato, Jiancheng Shen
  • Publication number: 20100084150
    Abstract: An electric power tool includes a tool body and a battery pack. A terminal voltage setting unit of the tool body sets a voltage of a body side terminal to a first voltage when a command to drive a drive portion of the tool body is issued by a switch of the tool body. A voltage changing unit of the battery pack changes a voltage of a battery side terminal from the first voltage to a second voltage when supply of electric power from the battery pack to the drive portion is permitted.
    Type: Application
    Filed: October 2, 2009
    Publication date: April 8, 2010
    Applicant: MAKITA CORPORATION
    Inventors: Hitoshi Suzuki, Tadahiko Kobayakawa, Tomoo Muramatsu
  • Patent number: 7665540
    Abstract: A method of driving a fastener into a workpiece with a tool generally includes retracting a trigger into a housing of the tool to execute a driver sequence and establishing a magnetic field in a multistage solenoid. The magnetic field is established in at least one of a first stage and a second stage. The method includes drawing an armature member to an extended condition from a retracted condition with the magnetic field and determining a position of the armature member relative to at least one of the first stage and the second stage. The method also includes directing power between the first stage and the second stage during the driver sequence based on the position of the armature member.
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: February 23, 2010
    Assignee: Black & Decker Inc.
    Inventors: Paul G. Gross, Nathan J. Cruise
  • Publication number: 20100032178
    Abstract: A machine tool, in particular in a handheld configuration, that is equipped with tools for a sensory detection of a trajectory that serves as a guideline and is detected in characteristic values and read in, alternatively to a programmed trajectory. The characteristic values that are on a side of the machine tool are converted into control signals for a working line that is tracked mark-free.
    Type: Application
    Filed: August 5, 2009
    Publication date: February 11, 2010
    Applicant: Robert Bosch GMBH
    Inventors: Thilo Koeder, Joachim Platzer, Ulli Hoffmann
  • Patent number: 7658237
    Abstract: The invention discloses a power tool having a motor adapted to drive a tool, comprising at least one switching element, coupled with a controller, for actuation of the motor, the controller being configured so that the motor can be switched on for driving the tool only when the at least one switching element is activated several times in a predetermined way, or when at least two switching elements are activated simultaneously or in a predetermined way in succession, there being provided at least three operating modes, namely an inoperative mode, in which the motor is out of operation, a working mode in which the motor is driven for driving the tool, and an intermediate mode, in which the user is signaled that further activation of a switching element is needed for transferring the motor to its working mode.
    Type: Grant
    Filed: December 20, 2004
    Date of Patent: February 9, 2010
    Assignee: C. & E. Fein GmbH
    Inventors: Boris Rudolf, Martin Beichter, Christof Kress
  • Patent number: 7654337
    Abstract: A method for controlling rock drilling and a rock drilling arrangement having at least one feed channel of a feed actuator provided with a restrictor, which causes a pressure drop if the penetration rate increases and, consequently, a flow through the restrictor increases. A pressure difference and an increase in the penetration rate can be detected by sensing the pressure before the restrictor and after the restrictor. When the feed rate increases, a hydraulic system is arranged to decrease percussion pressure.
    Type: Grant
    Filed: November 5, 2003
    Date of Patent: February 2, 2010
    Assignee: Sandvik Mining and Construction Oy
    Inventor: Roger Noël
  • Patent number: 7644782
    Abstract: The invention relates to a method for correcting positioning errors in rock drilling, and a rock drilling equipment. Deviation of the boom position from the theoretical position is measured as a function of the position of at least one boom joint, the measured deviations are stored in the memory of the drilling rig, and when the boom is positioned to the drilling position, its position is corrected on the basis of the stored deviation. The drilling equipment includes a memory for storing the deviations between the true position of the boom and the theoretical position calculated on the basis of the joint sensor values, and a calculating device for correcting the boom position on the basis of the deviations stored in the memory of the drilling rig.
    Type: Grant
    Filed: December 7, 1999
    Date of Patent: January 12, 2010
    Assignee: Sandvik Intellectual Property AB
    Inventors: John Coogan, Jussi Heikkola, Simo Sanerma
  • Patent number: 7628219
    Abstract: A handle for an electric hand tool, which in use, is detachably connected to the hand tool as an auxiliary handle (2), includes at least one detection device (6), which communicates with at least one regulating and/or control element in the electric hand tool through a contactless signal transmission device.
    Type: Grant
    Filed: December 22, 2004
    Date of Patent: December 8, 2009
    Assignee: Robert Bosch GmbH
    Inventors: Karl Frauhammer, Gerhard Meixner, Axel Kuhnle, Andreas Strasser, Erhard Hoffmann, Dietmar Hahn, Andreas Heilmann, Ulrich Single
  • Patent number: 7600577
    Abstract: A device for sensing a direction of rotation of a hand tool having an electric motor, has a rotatably supported brush plate provided in the electric motor and located in different positions depending on a direction of rotation of the electric motor; and at least one sensor which senses the different positions of said brush plate to determine a direction of rotation, wherein said sensor is configured as a contactless sensor.
    Type: Grant
    Filed: December 26, 2006
    Date of Patent: October 13, 2009
    Assignee: Robert Bosch GmbH
    Inventors: Robert Simm, Markus Weber, Bernhard Roth
  • Publication number: 20090205848
    Abstract: A powered driver and methods are disclosed, the driver including a head having a gapped jaw and housing a motor driven drive transfer assembly for operating a rotatable split socket engageable at a threaded connector. A reaction unit is movably maintained through the head, and a probe is associated with the reaction unit. The methods of this invention include setting a selected rotational limitation at the driver relating to fitting characteristics, operating the driver to cause relative rotation of a connector nut located in the socket and connector body engaged by the reaction unit. One of a plurality of operational modes for driver operations is selected and relative movement of the head and reaction unit are monitored during driver operation. The driver is controlled so that driver operation ceases when a selected combination of events related to operational mode selected and at least one of rotational limitation setting, monitored relative movement or driver operation occurs.
    Type: Application
    Filed: October 27, 2008
    Publication date: August 20, 2009
    Inventors: David Wilson, JR., Brent A. Sigmon
  • Patent number: 7556103
    Abstract: A fastening tool with a clutch for shutting off transmission of torque, capable of self-diagnosing fastening torque of a screw or the like at low cost without using expensive elements such as a torque sensor, etc. A fastening tool (10) has a motor (13), a main shaft (20) engaging with a screw or the like, and a clutch (14) interposed between the motor (13) and the main shaft (20). The clutch (14) transmits torque from the motor (13) to the main shaft (20) when a load acting on the main shaft (20) is less than a predetermined value, and shuts off torque transmission from the motor (13) to the main shaft (20) when a load acting on the main shaft (20) is equal to or greater than the predetermined value. The fastening tool (10) further has a control unit (60) for controlling the motor (13).
    Type: Grant
    Filed: March 10, 2005
    Date of Patent: July 7, 2009
    Assignee: Makita Corporation
    Inventor: Yutaka Matsunaga
  • Patent number: 7540334
    Abstract: An electrically powered hand tool is disclosed. The tool includes a motor, a power source, a work element and a controller. Various alternative features, embodiments and operative configurations are disclosed.
    Type: Grant
    Filed: February 11, 2008
    Date of Patent: June 2, 2009
    Inventors: Stephen F. Gass, David S. D'Ascenzo
  • Publication number: 20090120657
    Abstract: An improved method is provided for controlling a power tool having a rotary shaft. The method includes: disposing an inertial mass in a housing of the power tool, such that the inertial mass is freely rotatable about an axis of rotation which is axially aligned with the rotary shaft; monitoring rotational motion of the power tool in relation to the inertial mass during operation of the power tool; and activating a protective operation based on the rotational motion of the power tool in relation to the inertial mass.
    Type: Application
    Filed: January 16, 2009
    Publication date: May 14, 2009
    Applicant: Black & Decker Inc.
    Inventors: David A. Carrier, Daniel Puzio, Robert Bradus
  • Publication number: 20090065225
    Abstract: A power tool can include a housing and a motor assembly in the housing. The motor assembly can include an output member and a motor for translating the output member. A kickback sensor can sample successive periods of current through the motor and produce an output in response thereto. An anti-kickback control device can remove energy from the output member in response to the output of the kickback sensor. A switch can have a first setting and a second setting. The first setting can correspond to a first operating condition of the anti-kickback control device. The second setting can correspond to a second operating condition of the anti-kickback control device.
    Type: Application
    Filed: September 4, 2008
    Publication date: March 12, 2009
    Applicant: Black & Decker Inc.
    Inventors: Michael K. Forster, Kyle J. Wheaton
  • Publication number: 20090055028
    Abstract: Pneumatic tightening tools can be used for high speed assembly of critical bolts to precise loads by dynamically controlling the output power of the pneumatic tool during a tightening cycle using an electronically controlled air pressure regulator to reduce the tightening rate, or the load increase per impact for impact or impulse tools, to enable the tool to be stopped precisely at a specified stopping load or torque. For prevailing torque fasteners, the output power of the pneumatic tool is dynamically controlled to minimize the speed of rotation during rundown, to minimize the heating effects associated with such torque fasteners, and to then increase the power from the tool, as required, to provide the torque to reach the specified stopping load or torque. The maximum air pressure supplied to the pneumatic tool can be limited, depending on the expected torque required to tighten the fastener to the specified load or torque.
    Type: Application
    Filed: April 6, 2007
    Publication date: February 26, 2009
    Inventors: Ian E. Kibblewhite, Donald E. Kotas
  • Patent number: 7487845
    Abstract: An improved method is provided for controlling a power tool having a rotary shaft. The method includes: disposing an inertial mass in a housing of the power tool, such that the inertial mass is freely rotatable about an axis of rotation which is axially aligned with the rotary shaft; monitoring rotational motion of the power tool in relation to the inertial mass during operation of the power tool; and activating a protective operation based on the rotational motion of the power tool in relation to the inertial mass.
    Type: Grant
    Filed: April 28, 2008
    Date of Patent: February 10, 2009
    Assignee: Black & Decker Inc.
    Inventors: David A. Carrier, Daniel Puzio, Robert Bradus
  • Patent number: 7487844
    Abstract: A power tool includes solid-state motor control. The tool includes a solid state variable speed control signal generator for generating a variable speed control signal, a microcontroller for generating a pulse width modulated (PWM) signal corresponding to the variable speed control signal, a driver circuit for generating H-bridge driving signals corresponding to the PWM signal, and an H-bridge circuit for selectively coupling a motor to a power source in accordance with the H-bridge driving signals.
    Type: Grant
    Filed: November 3, 2006
    Date of Patent: February 10, 2009
    Assignee: Robert Bosch GmbH
    Inventors: John DeCicco, David Pozgay, Illya Kovarik
  • Publication number: 20090028652
    Abstract: An electric drill having a function for preventing drilling of unexpected oblique hole. Further, in the electric drill, when the direction of drilling is displaced in drilling work using the electric drill, it is sensed automatically to stop the drilling. The electric drill (1) performs drilling in the direction perpendicular a workpiece (7) and has a tilt sensor (10) mounted on a tilt sensor mounting surface (8) defined in parallel to the ground surface. When the rotation axis (C) of the drill positioned perpendicular to the surface of the workpiece is tilted to an angle equal to or greater than a predetermined angle, the tilt sensor (10) senses the tilt to shutoff a drive current of the electric drill.
    Type: Application
    Filed: April 3, 2006
    Publication date: January 29, 2009
    Inventor: Kazuhiro Yamamoto
  • Patent number: 7481627
    Abstract: An air compressor utilizing an electronic control system. A pneumatically controlled regulator is provided for controlling output pressure for an air compressor. Digital gauges are provided on the air compressor to replace conventional mechanical gauges. A variable speed motor is used, which in turn varies the speed of the pump. Tools are provided for an air compressor that are capable of transmitting a signal to the air compressor indicating a desired pressure and/or motor speed at which the air compressor is to operate.
    Type: Grant
    Filed: August 30, 2004
    Date of Patent: January 27, 2009
    Assignee: MAT Industries LLC
    Inventor: Kurt Beckman
  • Patent number: 7464769
    Abstract: An object of the present invention is to provide an electric screwdriver device having a function for determining that a correct tightening operation has been carried out when the tightening operation has taken a time longer than a reference time predetermined for the tightening operation, characterized in comprising a novel feature for determining the reference time.
    Type: Grant
    Filed: February 28, 2007
    Date of Patent: December 16, 2008
    Assignee: Nitto Kohki, Co., Ltd.
    Inventors: Hiroyuki Nakazawa, Hideki Fujita
  • Publication number: 20080251268
    Abstract: An abrupt fall in a current value immediately after an abrupt rise at the time when an starting switch is turned ON is detected, when the current value rises due to starting of nut fastening and then the current value abruptly falls, it is determined that an inward flange of a washer is sheared, and when the current value reaches a value corresponding to a primary fastening torque, the motor is stopped.
    Type: Application
    Filed: April 11, 2007
    Publication date: October 16, 2008
    Inventor: TOSHIHIKO KUSHIDA
  • Patent number: 7424920
    Abstract: A method and device for detecting and responding to impact loosening of thread joints at rock drilling, in which vibrations from a drill string (1) are sensed at the same time as a rock drilling machine (2) movable along a feed beam (6) exerts the drill string (1) to impacts without feeding the drill string (1) against a ground (3), the sensed vibrations are supplied to an analysis tool (4), the sensed vibrations are compared with known vibration patterns by the analysis tool, and a signal is sent to a control system (5) for controlling the rock drilling machine (2) for stopping an impact device of the rock drilling machine when the analysis tool detects that the sensed vibrations correspond to a known vibration pattern indicating that the thread joints have been loosened by impact.
    Type: Grant
    Filed: September 24, 2004
    Date of Patent: September 16, 2008
    Assignee: Atlas Copco Rock Drills AB
    Inventors: Karin Bergstrand, Katarina Carlsson, Björn Lindgren
  • Publication number: 20080202786
    Abstract: An improved method is provided for controlling a power tool having a rotary shaft. The method includes: disposing an inertial mass in a housing of the power tool, such that the inertial mass is freely rotatable about an axis of rotation which is axially aligned with the rotary shaft; monitoring rotational motion of the power tool in relation to the inertial mass during operation of the power tool; and activating a protective operation based on the rotational motion of the power tool in relation to the inertial mass.
    Type: Application
    Filed: April 28, 2008
    Publication date: August 28, 2008
    Inventors: David A. Carrier, Daniel Puzio, Robert Bradus
  • Publication number: 20080196910
    Abstract: A power hand drill or other power tool includes at least one of a detachable non-contact voltage sensing device and a detachable subsurface object locator for detecting the presence of an object beneath a surface being probed with the locator. The drill has a housing with a flat accessory mounting surface including coupling elements for coupling the sensing module to the drill. The accessory device includes a mating coupling element to engage with the coupling element in the drill housing. The non-contact voltage sensing circuitry includes sensing circuitry contained within a housing with an antenna that is positioned opposite a tool head of the power tool, and an indicator mounted to the module for indicating the presence of a voltage.
    Type: Application
    Filed: January 30, 2008
    Publication date: August 21, 2008
    Inventors: Patrick J. Radle, Daryl C. Brockman, David L. Wiesemann, George R. Steber, Thomas M. Luebke
  • Publication number: 20080185984
    Abstract: The invention relates to a power tool having a change-speed gear device comprising a plurality of gears (1, 2) for adjusting on demand power stages of a drive, wherein an overload protection can be coupled to the gears (1, 2). According to the invention, the device comprises at least one gear (3) in which the overload protection function can be forcibly deactivated. The invention also relates to an overload protection.
    Type: Application
    Filed: July 3, 2006
    Publication date: August 7, 2008
    Inventors: Robert Simm, Cornelis Van Der Schans, Markus Weber
  • Patent number: 7404449
    Abstract: A pile driving control apparatus for a pile driving system includes a hydraulic control system that controls a throttle of a pile driving hammer, and thereby controls an impact velocity of the hammer with a pile. A controller provides a control signal to the hydraulic control system. Based on the control signal, the hydraulic control system controls an impact velocity of the hammer during a subsequent hammer stroke. The controller may determine one or more control parameters such as sound pressure at a sound control location during a hammer stroke, vibration at a vibration control location during a hammer stroke, an impact force imparted to the pile during a hammer stroke, and/or actual pile capacity of the pile, and provide to the hydraulic control system a control signal based on the determined control parameter(s).
    Type: Grant
    Filed: November 20, 2006
    Date of Patent: July 29, 2008
    Assignee: Bermingham Construction Limited
    Inventors: Patrick Donald Bermingham, Mark Triska, Michael Justason, David Hoover, Stefano Gabaldo, Peter Middendorp, William Codd
  • Patent number: 7395871
    Abstract: An improved method is provided for controlling a power tool having a rotary shaft. The method includes: disposing an inertial mass in a housing of the power tool, such that the inertial mass is freely rotatable about an axis of rotation which is axially aligned with the rotary shaft; monitoring rotational motion of the power tool in relation to the inertial mass during operation of the power tool; and activating a protective operation based on the rotational motion of the power tool in relation to the inertial mass.
    Type: Grant
    Filed: April 22, 2004
    Date of Patent: July 8, 2008
    Assignee: Black & Decker Inc.
    Inventors: David A Carrier, Daniel Puzio, Robert Bradus
  • Publication number: 20080135268
    Abstract: In order to prevent the grip portion of a power tool from heating up, a brake resistor in which a regenerative current generated by a motor flows is disposed in a tail portion of the handle. The brake resistor is composed of two resistor elements connected in parallel with each other. The two resistor elements are mounted on different surfaces of a circuit board to effectively utilize an interior space of the handle.
    Type: Application
    Filed: November 16, 2007
    Publication date: June 12, 2008
    Inventors: Naoki TADOKORO, Takuya Teranishi
  • Publication number: 20080122404
    Abstract: A cordless power tool system includes a power tool including with a motor disposed in the tool housing, and a variable speed circuit for controlling the speed of the motor. A power tool battery pack is electrically connectable to the power tool. The battery pack has an electric/electronic component connectable to the variable speed circuit. The variable speed circuit and/or the power tool are disabled if the variable speed circuit fails to detect the electric/electronic component.
    Type: Application
    Filed: November 28, 2006
    Publication date: May 29, 2008
    Inventor: Daniele C. Brotto
  • Patent number: 7369916
    Abstract: A power tool control system connected with a drill press provides a system for determining operational settings for the drill press and/or structural factors of a workpiece to be operated upon by the drill press. For instance, the power tool control system may establish a visual indication of the axis of operation of the drill press upon a workpiece and/or determine the thickness, structural composition, and/or moisture content of a workpiece. The determined axis of operation and/or structural factor is utilized to determine the operational settings of the power tool.
    Type: Grant
    Filed: October 1, 2004
    Date of Patent: May 6, 2008
    Assignee: Black & Decker Inc.
    Inventors: Mark A. Etter, P. Brent Boyd, Craig A. Carroll, Brent Stafford, Jeffrey A. Wessel
  • Patent number: 7334648
    Abstract: A impact power tool includes a motor rotating a drive shaft, an output shaft holding a tool bit, and a hammer coupled to the drive shaft. The hammer is rotatable together with the drive shaft and is engageable with an anvil fixed to the output shaft so as to give a rotary impact to the output shaft. The tool includes a speed commander generating a target speed intended by a user, and a speed detector for detection of a speed of the drive shaft. A speed controller generates a control signal for driving the motor by referring to the target speed and the detected speed. The speed controller provides a detection time frame, and to adopt a predefined pseudo-detection speed as a substitute for the detected speed when no speed detection is available within the detection time frame. Accordingly, even if no speed detection continues, i.e.
    Type: Grant
    Filed: June 28, 2006
    Date of Patent: February 26, 2008
    Assignee: Matsushita Electric Works, Ltd.
    Inventor: Tadashi Arimura
  • Patent number: 7331406
    Abstract: An improved hand-held fastener driving tool is provided with an adjustable torque limiting control. The tool is portable, and is electrically powered using either a battery pack or a power cord as a power source. The tool drives collated fasteners (e.g., screws) into solid objects. The motor current is measured to determine the amount of torque being applied to a screw by the motor and mechanical drive components. As the screw bottoms out, the motor torque increases to a point where it exceeds the user-adjusted torque limiting control. The motor is automatically turned off at that point, thereby preventing the screw from being stripped.
    Type: Grant
    Filed: April 14, 2005
    Date of Patent: February 19, 2008
    Assignee: DuraSpin Products LLC
    Inventors: Mathias Wottreng, Jr., Gary Michael Bohart
  • Patent number: 7328752
    Abstract: An electrically powered hand tool is disclosed. The tool includes a motor, a power source, a work element and a controller. Various alternative features, embodiments and operative configurations are disclosed. The electrically powered hand tool may be a drill/driver configured to interrupt the rotation of the work element responsive to detection of a torque that exceeds a predetermined torque threshold.
    Type: Grant
    Filed: October 16, 2006
    Date of Patent: February 12, 2008
    Inventors: Stephen F. Gass, David S. D'Ascenzo
  • Patent number: 7318485
    Abstract: The invention discloses a power tool for screwing or drilling having a motor for driving a drive shaft, a controller for controlling the power tool, a motor switch for switching the motor on and off, switch for reversing the power tool between clockwise and counter-clockwise rotation, and vice versa, and a timer that permits reversal of the power tool between clockwise/counter-clockwise rotation, and vice versa, within a predefined period of time between actuation of the switch for clockwise/counter-clockwise rotation and for operation of the motor switch to start the power tool.
    Type: Grant
    Filed: December 15, 2005
    Date of Patent: January 15, 2008
    Assignee: C. & E. Fein GmbH
    Inventors: Oliver Greese, Thomas Scholl
  • Patent number: 7306046
    Abstract: A hand power tool has an electric motor, which is located in a housing and by way of which a tool insert located in a tool retainer is drivable in rotation, a guard device with which an uncontrollable blockage of the tool insert is detectable via a sensor unit and with which the housing is blockable in its motion; the guard device includes a mechanical unlocking unit that is manually actuatable by a user's action force, and gear is actuatable via an on/off switch for actuating the unlocking unit.
    Type: Grant
    Filed: September 25, 2004
    Date of Patent: December 11, 2007
    Assignee: Robert Bosch GmbH
    Inventors: Gerhard Meixner, Markus Leupert
  • Publication number: 20070261868
    Abstract: In a torque-limiting device, a first end engages a fastener, a second end receives an applied torque, and a magnetic torque limiter transmits the applied torque from the second end to the first end to rotate the first end in conjunction with the second end when the applied torque is less than a predetermined limit.
    Type: Application
    Filed: August 31, 2006
    Publication date: November 15, 2007
    Inventor: James R. Gross