Hand Tool Patents (Class 388/937)
  • Patent number: 8985241
    Abstract: The present invention is an articulating hand power tool with a main housing having a longitudinal axis, a head portion rotatably engaged with the main housing for placement at a plurality of angles with respect to the longitudinal axis of the main housing, an integrated circuit board located within the main housing and at least one controller accessible from outside of the main housing for controlling the integrated circuit board.
    Type: Grant
    Filed: October 22, 2013
    Date of Patent: March 24, 2015
    Assignee: Robert Bosch GmbH
    Inventors: David Pozgay, Harald Krondorfer, John B. Freese, John DeCicco, Stephen C. Oberheim
  • Patent number: 8963458
    Abstract: The electric tool is powered by a secondary battery as a power source, and includes: an output section configured to be transmitted thereto a rotation of a motor directly or through a decelerator; a voltage measurement section that measures a battery voltage; a storage means that stores, as a reference voltage, a voltage value of the battery voltage measured preliminarily when a motor-lock is occurring; and a control means that controls a driving of the motor. The control means is configured to decide that the motor is being locked and then stop or decelerate the motor upon detecting that the battery voltage measured through the voltage measurement section is maintained lower than or equal to the reference voltage stored in the storage means for a predetermined period of time during the driving of the motor.
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: February 24, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Motoharu Muto, Masamichi Nakamura, Masaki Ikeda
  • Patent number: 8933653
    Abstract: A motor current detection apparatus in the present invention includes: a current detection unit, a first filter, and a second filter. The detection unit detects a conduction current flowing from a battery to a brushless motor and outputs a conduction current signal corresponding to the detected conduction current. The first filter extracts a first current signal which is included in the conduction current signal outputted from the detection unit and is a signal component in a frequency band equal to or lower than a predetermined first cutoff frequency. The second filter extracts a second current signal which is included in the conduction current signal outputted from the detection unit and is a signal component in a predetermined frequency band within a frequency band equal to or lower than a predetermined second cutoff frequency higher than the first cutoff frequency and having the second cutoff frequency as a maximum value.
    Type: Grant
    Filed: October 2, 2012
    Date of Patent: January 13, 2015
    Assignee: Makita Corporation
    Inventors: Yoshitaka Ichikawa, Motohiro Omura, Kenya Yanagihara
  • Patent number: 8847532
    Abstract: An electric tool comprises a removable battery pack 2 as a power supply, a motor M as a power source, a drive unit being driven by said motor, a switch SW as an operation input unit, and a control circuit CPU controlling the driving of said motor according to the operation of said switch. The electric tool further comprises a power supply connection unit that enables a plurality of battery pack types, which have different rated output voltages, to be selectively connected, and an identification means that identifies the type of said battery pack that has been connected. Said control circuit is configured to control an output of said motor based on identification information for the type of said battery pack that has been connected, provided by said identification means.
    Type: Grant
    Filed: March 16, 2011
    Date of Patent: September 30, 2014
    Assignee: Panasonic Corporation
    Inventors: Hiroshi Miyazaki, Hidenori Shimizu, Akira Kawai, Masaaki Okada
  • Patent number: 8841871
    Abstract: The present application discloses a control circuit for a power tool and a method for manipulating the power tool. The control circuit has a detection circuit for battery packs, a calculating control circuit, a battery capacity indicating circuit for indicating the calculation result of the battery capacity, and a current measure and calculating circuit for measuring the current flowing through motors. The calculation result further includes the voltages consumed by the battery pack internally and the discharge loop. The method for manipulating the power tool includes pressing the switch to electrically connect the motor and the battery pack, measuring the parameters of the battery pack and allowing the motor to operate or not according the measured parameters. Further, after the motor is in operation, the battery capacity is calculated and the results are displayed.
    Type: Grant
    Filed: June 7, 2011
    Date of Patent: September 23, 2014
    Assignee: Chervon (HK) Limited
    Inventors: Dezhong Yang, Zheng Geng
  • Patent number: 8796976
    Abstract: An electric power tool includes a motor that rotary drives an output shaft; an operation unit to input a drive command of the motor; a torque setting device that sets an upper limit value of a rotational torque of the output shaft in accordance with a torque setting command; and a control device that drives the motor in one of a forward direction and a reverse direction in accordance with the drive command, and stops driving of the motor when the rotational torque of the output shaft has reached the upper limit value set by the torque setting device during driving of the motor. The torque setting device is configured to set the upper limit value such that the upper limit value during driving of the motor in the forward direction and the upper limit value during driving of the motor in the reverse direction are different.
    Type: Grant
    Filed: September 27, 2012
    Date of Patent: August 5, 2014
    Assignee: Makita Corporation
    Inventor: Takuya Kusakawa
  • Patent number: 8716962
    Abstract: A variable speed trigger mechanism that allows a user to reverse a direction of a motor and supply variable amounts of power to the motor using a single trigger mechanism. In a first motion, the user can actuate the reversing module to change the direction of the motor coupled to the trigger mechanism. In a second motion, the user can actuate the same trigger and apply variable amounts of power to the motor.
    Type: Grant
    Filed: November 10, 2011
    Date of Patent: May 6, 2014
    Assignee: Snap-on Incorporated
    Inventors: Daniel Pusateri, Kenneth Happ, James Brehm
  • Patent number: 8686678
    Abstract: An electric motor, having a stator (465), a rotor (470), and an apparatus for evaluating a signal provided for controlling said motor (110), comprises a receiving unit (430, 440) for receiving a control signal (PWM_mod), which is a pulse width modulated signal (PWM) onto which a data signal (DIR, DATA) is modulated. An evaluation unit (440) is provided for evaluating the modulated control signal (PWM_mod). The unit is configured to extract, from the modulated control signal (PWM_mod), data provided for operation of the motor (110). The control apparatus includes a signal generator (450) configured to generate, on the basis of the extracted or ascertained data provided for operation of the motor (110), at least one control signal for the motor (110), such as a commanded direction of rotation. Piggybacking other control data onto the PWM power level signal reduces hardware investment, by permitting omission of a signal lead which would otherwise be required in the motor structure.
    Type: Grant
    Filed: December 24, 2009
    Date of Patent: April 1, 2014
    Assignee: EBM-Papst St. Georgen GmbH & Co. KG
    Inventor: Markus Hirt
  • Patent number: 8674640
    Abstract: An electric power tool includes: a motor; a manipulation input receiving unit which receives a user manipulation input for rotating the motor; a mode changeover unit that has one manipulation portion which manipulated by the user; a rotation drive force transmitting unit that switches a transmission mechanism to one of the transmission mechanisms corresponding to the set position of the manipulation portion and transmits a drive force of the motor to a tool output shaft via the switched transmission mechanism; an electric signal output unit that outputs an electric signal corresponding to the set position of the manipulation portion; and a motor control unit that sets the control method of the motor to a control method preset for the electric signal, among a plurality of different types of control methods, based on the electric signal, and controls the motor by the set control method, based on manipulation by the user.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: March 18, 2014
    Assignee: Makita Corporation
    Inventors: Hidekazu Suda, Takuya Kusakawa
  • Patent number: 8604724
    Abstract: A switch for controlling a rotational speed of a motor includes an operation member, a first circuit, and a second circuit. The first circuit includes a brush coupled to the operation member having a contact and also includes a variable resistive plate having a resistance that changes in response to a contact position of the contact point of the brush, so that the first circuit outputs a control signal to the motor according to the contact position of the contact point. The second circuit connects the brush and the resistive plate without through the contact point when the brush is positioned at a given position relative to the resistive plate.
    Type: Grant
    Filed: August 31, 2010
    Date of Patent: December 10, 2013
    Assignee: Makita Corporation
    Inventor: Junichi Nishikimi
  • Patent number: 8476853
    Abstract: An overspeed protection subsystem is provided for a power tool having an electric motor. The overspeed protection subsystem is comprised of: a motor switch coupled in series with the motor; a motor control module interfaced with the motor switch to control switching operation of the motor switch; and an overspeed detection module that determines rotational speed of the motor and disables the power tool when the rotational speed of the motor exceeds a threshold.
    Type: Grant
    Filed: September 3, 2010
    Date of Patent: July 2, 2013
    Assignee: Black & Decker Inc.
    Inventors: John C. Vanko, Robert A. Usselman, David Beers
  • Patent number: 8466641
    Abstract: The invention relates to a method for decelerating a drive movement of a power tool and to a power tool suitable for carrying out the method, having a drive driven by a motor, an energy supply device for the provision of electrical energy, a controller having a motor controller for activating the motor and an operating-state recognition module which is to detect at least one operating-state variable and, as a function of this, to output a brake signal, the controller being designed to initiate, as a function of the brake signal, a braking procedure in which brake cycles are provided which have a first time segment, in which the motor is short-circuited, and a second time segment in which current is fed to the motor opposite to its original direction of rotation.
    Type: Grant
    Filed: July 20, 2011
    Date of Patent: June 18, 2013
    Assignee: C. & E. Fein GmbH
    Inventors: Michael Kaufmann, Ulf Rinckleb
  • Patent number: 8378600
    Abstract: An electric power tool “A” operates a working part 5 by repeating rotation of a motor 4 in a normal direction and in a reverse direction one or more times. The motor 4 includes a brushless motor. Sensors H for detecting a position of a rotor 15 are provided on the motor 4 so as to be advanced by an electrical angle of 30°±?° from an intermediate position between respective stator teeth 16 in a direction of the normal rotation of the rotor 15. A control part 20 for controlling the rotation of the motor 4 controls a driving signal of the motor 4 based on the results of detection by the sensors H. Moreover, the control part 20 selects a detection signal of the sensors H so that relation between the rotor 15 and the detection signal of the sensors H is equivalent in either of the normal rotation and the reverse rotation of the rotor 15.
    Type: Grant
    Filed: March 7, 2012
    Date of Patent: February 19, 2013
    Assignee: Max Co., Ltd.
    Inventors: Kouji Katou, Kazuya Takeuchi, Ichiro Kusakari, Osamu Itagaki, Takahiro Nagaoka
  • Patent number: 8324845
    Abstract: A rechargeable power tool includes a direct current motor, a switching circuit, at least one speed setting unit, a duty ratio setting unit, a drive unit, an operation amount detecting unit, an abnormality determining unit, and a determination threshold setting unit. The abnormality determining unit compares an operation amount detected by the operation amount detecting unit and a determination threshold set based on the operation amount to thereby determine whether or not an operation state of the rechargeable power tool is abnormal. The determination threshold setting unit sets the determination threshold in a continuous or stepwise manner in accordance with a rotation speed set by the speed setting unit.
    Type: Grant
    Filed: May 22, 2009
    Date of Patent: December 4, 2012
    Assignee: Makita Corporation
    Inventors: Jiro Suzuki, Fengying Dong, Takuya Kusakawa
  • Patent number: 8198839
    Abstract: An electric power tool “A” operates a working part 5 by repeating rotation of a motor 4 in a normal direction and in a reverse direction one or more times. The motor 4 includes a brushless motor. Sensors H for detecting a position of a rotor 15 are provided on the motor 4 so as to be advanced by an electrical angle of 30°±?° from an intermediate position between respective stator teeth 16 in a direction of the normal rotation of the rotor 15. A control part 20 for controlling the rotation of the motor 4 controls a driving signal of the motor 4 based on the results of detection by the sensors H. Moreover, the control part 20 selects a detection signal of the sensors H so that relation between the rotor 15 and the detection signal of the sensors H is equivalent in either of the normal rotation and the reverse rotation of the rotor 15.
    Type: Grant
    Filed: April 4, 2007
    Date of Patent: June 12, 2012
    Assignee: Max Co., Ltd.
    Inventors: Kouji Katou, Kazuya Takeuchi, Ichiro Kusakari, Osamu Itagaki, Takahiro Nagaoka
  • Patent number: 8067916
    Abstract: A cutting tool such as a miter saw, arranged to have an arrangement for selectively making and breaking power of a first circuit and an independent second second circuit each connected respectively to a first motor operating the cutting tool and to a second motor operating a dust suppressor such as a vacuum device. The arrangement enables the two circuits to serve the first and second motors in synchrony and to be operated by the switch of the cutting tool. The arrangement may comprise a relay adapted to energize and de-energize the second circuit. The second circuit may comprise one or more electrical receptacles enabling the second motor to operate under control of the switch after being plugged in to one of the receptacles. The cutting tool may comprise a receptacle which is hard wired to the first circuit. The cutting tool may incorporate a dynamic brake.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: November 29, 2011
    Inventors: Su Hak Auh, Charles J. Kim
  • Patent number: 7936142
    Abstract: A drilling device prevents recurrence of an overload condition after occurrence of the overload condition, thereby improving operability and safety in the drilling device. A motor for rotating a drill is connected to an AC power source through a motor control unit, a current detector, and a power switch. A magnet is also connected to the AC power source through the power switch and a full-wave rectifier. The motor control unit rotationally drives the motor on the basis of a signal sent from a main control unit according to a state in which a motor start switch is on. The main control unit controls the motor control unit to gradually reduce a supply voltage to the motor when the motor becomes overloaded, to gradually increase the voltage to the normal power supply condition when the overload condition is vanished, and to stop power supply to the motor if the overload condition continues for a predetermined period.
    Type: Grant
    Filed: December 13, 2006
    Date of Patent: May 3, 2011
    Assignee: Nitto Kohki Co., Ltd.
    Inventors: Kenji Otsuka, Osamu Asano
  • Patent number: 7928673
    Abstract: A method and apparatus for controlling a plurality of different motors used in a corresponding plurality of power tool applications requiring different operational characteristics. In one implementation a method involves the use of a single universal control module to store a generic, non-application-specific control algorithm. The generic, non-application-specific control algorithm has at least one programmable constant. The programmable constant is selected to transform the generic, non-application-specific control algorithm into an application-specific control algorithm. The programmable constant represents a function parameter relating to a specific functionality of a specific, selected motor used in a specific, selected motor application to implement a phase control over the specific, selected motor.
    Type: Grant
    Filed: December 2, 2009
    Date of Patent: April 19, 2011
    Assignee: Black & Decker Inc.
    Inventors: Samuel G. Woods, Michael K. Forster, John C. Vanko, Daniele C. Brotto, Brian R. Crowell, Jason K. Leh
  • Patent number: 7834566
    Abstract: A method for controlling the operation of a motor utilizing a generic motor control module. The method includes sampling at least one motor operating criterion during operation of the motor and executing a generic control algorithm at a predetermined periodic interval. Execution of the algorithm provides a firing angle, duty cycle, or other suitable control function solution for an electronic valve for each periodic interval, thereby controlling the behavior of the motor. Additionally, the method includes firing the electronic valve at the calculated timing during each periodic interval such that the motor functions in accordance with desired motor operational parameters.
    Type: Grant
    Filed: December 2, 2009
    Date of Patent: November 16, 2010
    Assignee: Black & Decker Inc.
    Inventors: Samuel G. Woods, Michael K. Forster, John C. Vanko, Daniele C. Brotto, Brian R. Crowell, Jason K. Leh
  • Patent number: 7795829
    Abstract: In an electric power tool and a method for operating an electric power tool, a torque limitation of an electric motor reacts when a load moment exceeds a predetermined threshold and in which an output request is carried out by means of a switch. A supply of current to the motor is interrupted when a criterion for the reaction of the torque limitation is detected based on a speed detection of the motor.
    Type: Grant
    Filed: April 3, 2007
    Date of Patent: September 14, 2010
    Assignee: Robert Bosch GmbH
    Inventors: Hartmut Seiler, Dirk Lamprecht
  • Patent number: 7750587
    Abstract: The method of controlling a motor which drives a tool of a power tool, includes initializing an electronic device and switching the motor on in a first step (31), continuously monitoring of the motor current (IM) and a battery voltage (UB) in a second step (32) which alternates with a third step (33) in which a continuous comparison of the battery voltage (UB) to a threshold value (GW) stored in a memory of the electronic device is carried out.
    Type: Grant
    Filed: August 29, 2007
    Date of Patent: July 6, 2010
    Assignee: Hilti Aktiengesellschaft
    Inventors: Thomas Mueller, Germar Meiendres, Konstantin Baxivanelis, Johannes Stempfhuber
  • Patent number: 7697826
    Abstract: A hand-guided or stationary power tool has a drive unit having a motor that includes a rotor having a permanent magnet and a stator and has a motor control designed to trigger the motor in a first rotational speed range according to a voltage-controlled mode and to trigger the motor in a second rotational speed range following the first rotational speed range in the direction of a higher rotational speed according to a field-weakening operation.
    Type: Grant
    Filed: May 3, 2005
    Date of Patent: April 13, 2010
    Assignee: Robert Bosch GmbH
    Inventors: Kurt Reutlinger, Volker Bosch
  • Patent number: 7671554
    Abstract: The present invention relates to a motor driving system. The motor driving system includes a motor, a transmission member, a follower member, a position-detecting light emitter, a position-detecting light receiver, and a positioning-status sensing element. The positioning-status sensing element includes a plurality of notches or openings. The positioning-status sensing element is moved between the position-detecting light emitter and the position-detecting light receiver such that a light beam emitted from the position-detecting light emitter is successively penetrated through the notches or openings to be received by the position-detecting light receiver. According to the light-receiving status of the position-detecting light receiver, the speed of the motor is reduced.
    Type: Grant
    Filed: December 18, 2007
    Date of Patent: March 2, 2010
    Assignee: Primax Electronics, Ltd.
    Inventors: Chia-Chang Lin, Chih-Hsun Lin
  • Patent number: 7652442
    Abstract: An electric tool switch mechanism includes a trigger switch for operating to at least rotate or stop a DC motor; and a power switch connected between the DC motor and a battery power source and closed when a pressed amount of the trigger switch exceeds a predetermined threshold value. The mechanism further includes a switching device connected between the DC motor and the battery power source via the power switch; a control circuit for controlling to turn the switching device on/off using a desired on-duty when the pressed amount of the trigger switch exceeds the threshold value; and a stopping unit that is controlled by the trigger switch for forcibly turning the switching device off before the power switch is changed from on to off when the trigger switch is released.
    Type: Grant
    Filed: June 28, 2007
    Date of Patent: January 26, 2010
    Assignee: Matsushitu Electric Works, Ltd.
    Inventors: Hiroshi Miyazaki, Toshiharu Ohashi
  • Patent number: 7636516
    Abstract: The invention relates to a machine tool comprising an electric motor (2) which serves to drive a tool and which has an adjustable, electric brush arrangement (3), and comprising a mode selector switch (6) having various switch positions. Provision is made for an adjusting device (8) to displace the brush arrangement (3) as a function of the switch position of the mode selector switch (6). Furthermore, the invention relates to a corresponding method.
    Type: Grant
    Filed: September 11, 2006
    Date of Patent: December 22, 2009
    Assignee: Robert Bosch GmbH
    Inventors: Karl Frauhammer, Gerhard Meixner, Martin Rittner, Heinz Schnerring, Andreas Strasser
  • 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
  • Patent number: 7595601
    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: Grant
    Filed: April 11, 2007
    Date of Patent: September 29, 2009
    Assignee: Maeda Metal Industries, Ltd.
    Inventor: Toshihiko Kushida
  • Patent number: 7504791
    Abstract: The invention relates to an electric power tool (1), having an electric motor (8) that serves to drive a tool (6). The electric power tool (1) is characterized in that a sensor unit (9) that detects the contact pressure of the tool (6) against a workpiece (7) cooperates with a signal transducer (10).
    Type: Grant
    Filed: November 23, 2004
    Date of Patent: March 17, 2009
    Assignee: Robert Bosch GmbH
    Inventors: Gustav Sieber, Ulrich Single
  • Patent number: 7453225
    Abstract: In an impulse wrench there is provided an impulse unit with a motor driven inertia drive member, and a movement detecting device arranged to detect an angular movement of the inertia drive member. The movement detecting device includes a rotating disc rigidly connected to and co-rotating with the inertia drive member. The impulse wrench also includes a sensing device including four Hall-element type sensors, and the disc has a rim portion which is magnetised to provide a number of magnetic poles for activating the sensors at rotation of the inertia drive member. The sensors are arranged in pairs such that the delivered signals from the sensors in each pair has a relative phase lag of 180 degrees, and the sensors of one of the pairs are arranged to deliver signals with a phase lag of 90 degrees relative to the sensor signals from the other pair.
    Type: Grant
    Filed: November 30, 2004
    Date of Patent: November 18, 2008
    Assignee: Atlas Copco Tools AB
    Inventor: John Robert Christian Friberg
  • Patent number: 7427842
    Abstract: A circuit for a series motor for a power tool is disclosed, wherein reliable switching is achieved by means of two electronic switches, without the use of a mechanically disconnecting switch. To this end, two electronic switches, preferably triacs, are preferably connected in series to each other, the voltage drop across the triacs being continuously monitored by a monitoring circuit. A check for faults can be carried out before switching on the power tool. Alternatively, a fusible cutout can be tripped by means of a protective switch connected in parallel thereto.
    Type: Grant
    Filed: October 13, 2006
    Date of Patent: September 23, 2008
    Assignee: C. & E. Fein GmbH
    Inventors: Christof Kress, Martin Beichter
  • Patent number: 7400106
    Abstract: A battery-powered tool indicates to an operator that a torque limit has been reached. The tool comprises a driver circuit for generating motor interface driving signals, a motor interface circuit coupled to a motor to selectively couple power to the motor in accordance with the motor driving signals, a torque limit signal generator for generating a torque limit signal, a motor torque signal generator for generating a torque signal corresponding to a torque generated by the motor, and a microcontroller for comparing the motor torque signal to the torque limit signal and for generating a torque limit indicating signal in response to the torque signal being equal to or greater than the torque limit signal so the driver circuit operates the motor to vibrate to alert an operator that the torque limit has been reached.
    Type: Grant
    Filed: November 3, 2006
    Date of Patent: July 15, 2008
    Assignee: Robert Bosch GmbH
    Inventors: John DeCicco, Illya Kovarik
  • Patent number: 7398834
    Abstract: A hammer drill comprising: a motor; a drive transmission capable of operating in at in at least a rotary mode and a reciprocating mode; a mode change mechanism; a switch which, when closed, provides power to the motor; and a mechanical lock-on mechanism which, when locked mechanically holds the switch closed to maintain the power to the motor. Additionally, the hammer drill includes a first sensor, which indicates the mode of operation of drive transmission; and a second sensor which indicates whether the lock-on mechanism is locked; and a controller which is capable of interfering with the operation of the motor, when the controller detects that the drive transmission is in the rotary mode of operation and the lock-on mechanism has been locked.
    Type: Grant
    Filed: February 23, 2006
    Date of Patent: July 15, 2008
    Assignee: Black & Decker Inc.
    Inventors: Achim Jung, René Jäger, Ralf Seebauer
  • Patent number: 7372228
    Abstract: The invention relates to an electric power tool having a control and/or regulating device for an electric motor. It is provided that the control and/or regulating device (4) is assigned an electronic memory element (5) for at least one operating state of the electric motor (1).
    Type: Grant
    Filed: November 24, 2004
    Date of Patent: May 13, 2008
    Assignee: Robert Bosch GmbH
    Inventors: Dietmar Hahn, Aldo Di Nicolantonio
  • Patent number: 7359628
    Abstract: The invention relates to a drive device for an electric motor, in particular for a brushless DC motor in an electrical tool, which is powered by a rechargeable battery. The drive device has at least one power semiconductor, in particular for controllable application of an electrical voltage to the electric motor, a control circuit for controlling the power semiconductor, and a mounting plate which, for example, is in the form of a printed circuit board. At least one portion of the control circuit, in particular electrical and/or electronic components as well as the conductor tracks (which connect the electrical and/or electronic components) of the control circuit, is arranged on the mounting plate. The power semiconductor is arranged on the mounting plate and/or on a mount element, which is mounted on the mounting plate.
    Type: Grant
    Filed: March 22, 2002
    Date of Patent: April 15, 2008
    Assignee: Marquardt GmbH
    Inventors: Peter Broghammer, Daniel Hafen
  • Patent number: 7330006
    Abstract: A power tool includes a brushless motor, a cooling fan, and a driving unit in a housing. The brushless motor is provided in the housing and having a rotary shaft. The cooling fan is attached to the rotary shaft in the housing, and rotatable together with the rotary shaft. The driving unit is provided in the housing for driving the motor. The driving unit includes an inverter circuit having a circuit board and a plurality of switching elements mounted on the circuit board. The circuit board is positioned on an opposite side to the motor with respect to the cooling fan. The plurality of switching elements is positioned around the cooling fan in a circumferential direction about the rotary shaft.
    Type: Grant
    Filed: April 19, 2006
    Date of Patent: February 12, 2008
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Kazutaka Iwata, Shinichi Sakamoto, Tomoyoshi Yokota, Kenichirou Yoshida, Tomomasa Nishikawa, Atsushi Nakagawa
  • Patent number: 7276878
    Abstract: Amperage control of a power tool motor is provided by pulse width modulation of current from a power supply. The pulse width modulation may be varied according to the determined motor current and measured power supply voltage. The power supply may include a battery such as lithium ion or nickel cadmium.
    Type: Grant
    Filed: September 29, 2006
    Date of Patent: October 2, 2007
    Assignee: Black & Decker Inc.
    Inventors: Alan Phillips, Julie L. Jones
  • Patent number: 7274866
    Abstract: A power tool is disclosed comprising a controller for controlling at least one operating parameter, a motor for driving a tool, at least three switching elements which are coupled to the controller, and a speed sensor for monitoring the speed of the motor to generate a speed signal, which is fed to the controller. The controller is configured so that, in dependence on the speed signal, with simultaneous activation of a first and at least one other of the switching elements, a control signal for changing the operating parameter is output, and that, in dependence on the speed signal, with activation of the first and at least one other switching element, a control signal for modified changing of the operating parameter is output (FIG. 2).
    Type: Grant
    Filed: May 11, 2006
    Date of Patent: September 25, 2007
    Assignee: C. & E. Fein GmbH
    Inventors: Boris Rudolf, Sigmund Braun
  • Patent number: 7211972
    Abstract: The present invention is directed to a power tool including a wireless remote stop for terminating the flow of electricity to an electric motor. The electric motor is configured for operating a working element assembly of a power tool, such as an arbor/circular saw blade included a table saw. In an embodiment, a remote stop is a hand-held fob, having a housing and a button. Alternatively, the remote stop may be implemented as a foot pedal apparatus, for being disposed on a shop floor.
    Type: Grant
    Filed: May 5, 2006
    Date of Patent: May 1, 2007
    Assignee: Black & Decker Inc.
    Inventors: Jaime E. Garcia, Jeffrey D. Weston
  • Patent number: 7177533
    Abstract: A system and method for powered surgical handpiece capable of powering various micro-cutting instruments is described. The system is comprised of a controller adapted for controlling/interfacing with a powered surgical handpiece based upon user-defined procedural information. A data entry device is used for entering the user-defined procedural information used by the controller for configuring and operating the motor control system.
    Type: Grant
    Filed: September 24, 2001
    Date of Patent: February 13, 2007
    Assignee: Medtronic, Inc.
    Inventors: Kevin L. McFarlin, Cecil O. Lewis
  • Patent number: 7164252
    Abstract: An electrically powered hand tool is described and which includes a three phase electrical motor having a plurality of poles; an electrical motor drive electrically coupled with the three phase electrical motor; and a source of electrical power which is converted to greater than about 208 volts three-phase and which is electrically coupled with the electrical motor drive.
    Type: Grant
    Filed: July 29, 2005
    Date of Patent: January 16, 2007
    Assignee: Battelle Energy Alliance, LLC
    Inventors: Kurt S. Myers, Teddy R. Reed
  • Patent number: 7137541
    Abstract: A fastening tool having a contact trip switch, a trigger switch, a driver, a motor assembly and a controller. The controller is configured to selectively operate the motor assembly in response to inputs received from the contact trip switch and the trigger switch. The controller includes a mode selector switch having a first switch setting, which can permit bump-feed operation of the fastening tool, and a second switch setting, which prohibits bump-feed operation of the fastening tool.
    Type: Grant
    Filed: March 31, 2005
    Date of Patent: November 21, 2006
    Assignee: Black & Decker Inc.
    Inventors: Ashok S. Baskar, Craig A. Schell, Alan Berry, Nathan Cruise, Charles L. Bradenbaugh, IV
  • Patent number: 7135791
    Abstract: A controller compares a minimum value of power source voltage which decreases in association with starting current generated upon start of a motor with a threshold value in a storing unit. When the minimum value is less than the threshold value, the controller notifies of shortage of the power source terminal voltage, and stops the motor. The controller also compares a value obtained by integrating the power source voltage which decreases in association with starting current generated upon start of the motor for only predetermined time with the threshold value in the storing unit, when the integral value is less than the threshold value, notifies of shortage of the power source terminal voltage, and stops the motor.
    Type: Grant
    Filed: November 23, 2005
    Date of Patent: November 14, 2006
    Assignee: Maeda Metal industries, Ltd.
    Inventors: Toshihiko Kushida, Yukio Torigai
  • Patent number: 7133601
    Abstract: Amperage control of a power tool motor is provided by pulse width modulation of current from a power supply. The pulse width modulation may be varied according to the determined motor current and measured power supply voltage. The power supply preferably includes a battery, such a lithium ion or nickel cadmium.
    Type: Grant
    Filed: February 18, 2004
    Date of Patent: November 7, 2006
    Assignee: Black & Decker Inc.
    Inventors: Alan Phillips, Julie L. Jones
  • Patent number: 7112934
    Abstract: A power tool such as an electric drill typically contains a gear train that couples the output spindle of the motor to the tool bit-receiving chuck. The control circuit for the power tool is operable in a ratcheting or pulse mode that causes the output spindle to rotate in discrete incremental amounts. Corresponding methods for controlling the operation of the electric motor of a power tool are also disclosed.
    Type: Grant
    Filed: October 20, 2003
    Date of Patent: September 26, 2006
    Assignee: Black & Decker Inc.
    Inventor: Alan A Gilmore
  • Patent number: 7102303
    Abstract: A method for controlling the operation of a motor utilizing a universal motor control module. The method includes sampling at least one motor operating criterion during operation of the motor and executing a universal control algorithm at a predetermined periodic interval of an AC line signal. Execution of the algorithm provides a firing angle solution for an electronic valve for each periodic interval, thereby controlling the behavior of the motor. Additionally, the method includes firing the electronic valve at the calculated firing angle during each periodic interval such that the motor functions in accordance with desired operational parameters.
    Type: Grant
    Filed: April 30, 2003
    Date of Patent: September 5, 2006
    Assignee: Black & Decker Inc.
    Inventor: Daniele C. Brotto
  • Patent number: 7088066
    Abstract: An eletrical device derives power from an incoming power source to produce output plower to drive the device. The device includes circuitry that determines at lehst one characteristic of the incoming power source, and adjusts the output power used to drive the device based on the characteristic or characteristics of the incoming power source.
    Type: Grant
    Filed: June 21, 2004
    Date of Patent: August 8, 2006
    Assignee: Thor Power Corp.
    Inventor: William R. Haller
  • Patent number: 7075258
    Abstract: A power control device of an electric tool has a control or regulating device for adjusting a power output to an electric motor of the electric tool by means of a pulse width modulation, and a frequency transmitter that varies a frequency of the pulse width modulation in dependence on a required power output; also a method for power control in an electric tool, as well as an electric tool with a power control device are provided as well.
    Type: Grant
    Filed: September 8, 2004
    Date of Patent: July 11, 2006
    Assignee: Robert Bosch GmbH
    Inventor: Stefan Roepke
  • Patent number: 7064502
    Abstract: The present invention is directed to a power tool including a wireless remote stop for terminating the flow of electricity to an electric motor. The electric motor is configured for operating a working element assembly of a power tool, such as an arbor/circular saw blade included a table saw. In an embodiment, a remote stop is a hand-held fob, having a housing and a button. Alternatively, the remote stop may be implemented as a foot pedal apparatus, for being disposed on a shop floor.
    Type: Grant
    Filed: July 23, 2004
    Date of Patent: June 20, 2006
    Assignee: Black & Decker Inc.
    Inventors: Jaime E. Garcia, Jeffrey D. Weston
  • Patent number: 7058291
    Abstract: A system and method for reducing the cost of producing a brushless DC motor (58) is presented. The brushless DC motor (58) provides higher power density and efficiency with an increased tool run time. The brushless DC motor (58) includes a rotor assembly (72) that has an unmagnetized permanent magnet (74) affixed to a shaft. The permanent magnet (74) remains unmagnetized until the motor is partially assembled. A plurality of coils (94) for producing a magnetic field are wound about the rotor assembly (72). The coils (94) include end turns that enclose the rotor assembly (72) such that the rotor assembly (72) is not removable. Since the windings (94) are wound with the rotor assembly (72) already enclosed, the windings (94) do not require large end coils to allow subsequent insertion of the rotor (72). Minimizing the end coils reduces the length of wire required per turn, thereby reducing the resistance of the winding (94).
    Type: Grant
    Filed: January 5, 2001
    Date of Patent: June 6, 2006
    Assignee: Black & Decker Inc.
    Inventors: J. Michael Weaver, Aris C. Cleanthous, Christopher R. Yahnker, Bhanuprasad V. Gorti, Richard T. Walter
  • Patent number: RE43636
    Abstract: A tool, attachable to a spindle of a machine tool and capable of changing independently a rotational speed of a cutting tool from that of the spindle, provided with a cutting tool for machining a workpiece, an electric motor for driving the machining tool, a generator for generating electric power to drive the electric motor by the rotation of the spindle, a tool holding part for rotatably holding the cutting tool, a casing for holding the electric motor, the generator, the tool attachment part, and the tool holding part, and a locking part for preventing rotation of the casing by engagement with a non-rotating part of the machine tool. A tool includes an AC generator, an AC motor and a case holding the generator and motor such that the generator and the motor are arranged in the case along a center axis and a longitudinal direction of a rotatable portion of the generator.
    Type: Grant
    Filed: September 10, 2007
    Date of Patent: September 11, 2012
    Assignee: Toshiba Kikai Kabushiki Kaisha
    Inventors: Koichi Katoh, Yasunori Katoh