Having Torque Responsive Clutch Patents (Class 173/178)
  • Patent number: 10328558
    Abstract: A drill includes a housing and a motor having a drive spindle. An output spindle is capable of being rotationally driven by the drive spindle via a torque clutch. The drill further includes atangential impact mechanism for superimposing tangential impacts onto the output spindle when activated. The tangential impact mechanism includes a sleeve rotatably mounted on the output spindle, and an anvil rotatably mounted onto the output spindle. The output spindle and the sleeve are rotationally driven by a planetary gear system comprising a ring gear, a sun gear and a planetary gear which is drivingly connected between the ring gear and sun gear.
    Type: Grant
    Filed: December 4, 2015
    Date of Patent: June 25, 2019
    Assignee: Black & Decker Inc.
    Inventors: Markus Rompel, Rafael Glottschling
  • Patent number: 10308230
    Abstract: The electric parking brake device comprising a resolver which has a base arranged in a housing so as to face a rotating plate fixed to a rotation axis of an electric motor, wherein a first sheet coil comprising a detecting coil and a second sheet coil comprising a primary coil of an output transformer coupled to a detecting coil are arranged on the opposite face of the rotating plate, and wherein a third sheet coil comprising a excitation coil opposite to the detecting coil and a fourth sheet coil comprising a secondary coil of an output transformer opposite to the primary coil of the output transformer are arranged on the opposite face of the base.
    Type: Grant
    Filed: November 13, 2015
    Date of Patent: June 4, 2019
    Assignee: IGARASHI ELECTRIC WORKS LTD
    Inventor: Junichi Tada
  • Patent number: 10286534
    Abstract: A driving tool, such as a nailer, includes an electric motor, a crank mechanism driven by the electric motor, and a control apparatus for driving the electric motor. A crank-angle detection or calculation unit (109E) detects the crank angle of the crank mechanism or the motor in order to detect the operation state of the electric motor and a stopped time period of the motor is calculated from the crank angle. A sleep-control unit (109A) switches the driving tool between a sleep mode and a drive-enabled mode. If the stopped time period of the electric motor exceeds a prescribed time period, then the sleep-control unit (109A) switches the driving tool to the sleep mode. In the sleep mode, the electric current supplied to one or more of the control units constituting the control apparatus is reduced or cut off, thereby reducing the power consumption of the driving tool.
    Type: Grant
    Filed: April 14, 2015
    Date of Patent: May 14, 2019
    Assignee: MAKITA CORPORATION
    Inventor: Itsuku Kato
  • Patent number: 10286529
    Abstract: A screw-tightening power tool includes a motor housing. A brushless motor has a stator that is fixed to the motor housing and a rotor that is rotatable relative to the stator. A tip-tool retaining part is configured to hold a bit and a clutch is disposed between the rotor and the tip-tool retaining part. A grip housing extends from the motor housing. A switch assembly is provided in the grip housing and a trigger is held by the switch assembly. A sensor-circuit board is fixed to the stator. The sensor-circuit board and the switch assembly are connected by a first cord, and the stator and the switch assembly are connected by a second cord.
    Type: Grant
    Filed: February 26, 2014
    Date of Patent: May 14, 2019
    Assignee: MAKITA CORPORATION
    Inventors: Takashi Kiyohara, Takashi Sakamoto
  • Patent number: 10213912
    Abstract: An impact driver includes a motor, a spindle rotated by the motor, a hammer that is movable forward and rearward with respect to the spindle and that has an inner peripheral portion facing the spindle, and an anvil struck in a rotational direction by the hammer. A grease supply path is provided to supply grease to the inner peripheral portion of the hammer.
    Type: Grant
    Filed: July 1, 2014
    Date of Patent: February 26, 2019
    Assignee: MAKITA CORPORATION
    Inventors: Ryunosuke Kumagai, Tokuo Hirabayashi
  • Patent number: 10195731
    Abstract: A tool having a housing assembly, which defines a handle, a motor assembly, a trigger assembly, a spindle and a transmission assembly. The motor assembly is received in the housing assembly and has an output shaft. The trigger assembly is coupled to the housing assembly and is configured for use in actuating the motor assembly. The transmission assembly transmits rotary power between the output shaft of the motor assembly and the spindle. The transmission assembly includes a planetary stage with an input sun gear, an output planet carrier and a compound planet gear having a first planet gear and a second planet gear coupled together for common rotation on the output planet carrier. The planetary stage is selectively operable in a first gear reduction and a second, relatively lower gear reduction in which the compound planet gear cooperates to produce at least one intermediate gear reduction within the planetary stage.
    Type: Grant
    Filed: February 13, 2017
    Date of Patent: February 5, 2019
    Assignee: BLACK & DECKER INC.
    Inventor: David C. Tomayko
  • Patent number: 10145199
    Abstract: A rotating control device for a tubular string includes a body, a housing assembly, and a clamp device. An annulus is formed between the body and the tubular string. The housing assembly includes an annular seal configured to seal off an annulus between the tubular string and the body. The clamp device is configured to selectively permit and prevent displacement of the housing assembly relative to the body. The clamp device includes a first clamp section and a second clamp section coupled to and pivotable about a pivot, and a motor positioned between an end of the first clamp section and an end of the second clamp section, wherein the motor is configured to move the ends of the first and second clamp sections relative to each other.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: December 4, 2018
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Leonard C. Linde, Reece E. Cashion, Larry D. White
  • Patent number: 10065297
    Abstract: The invention relates to a method for operating a hand-held machine tool with a tangential impact mechanism which can be driven by means of a drive shaft and an electric motor, according to which method an actual torque provided by the drive shaft is adjusted to a required torque depending on a measured motor current, wherein the required torque is less than a triggering torque of the tangential impact mechanism.
    Type: Grant
    Filed: October 7, 2013
    Date of Patent: September 4, 2018
    Assignee: Hilti Aktiengesellschaft
    Inventors: Joachim Wörz, Michael Brandner
  • Patent number: 10054468
    Abstract: Described herein is an improved displacement transducer, a closed loop control system incorporating the same, and an improved method of manufacturing of manufacturing a displacement transducer. The improved transducer has several advantages, including improved manufacturability; improved fluid flow within the sensor and reduced cavitation as a result; and the enablement of closed loop control for assisted manual or fully automatic displacement.
    Type: Grant
    Filed: August 15, 2017
    Date of Patent: August 21, 2018
    Assignee: Stress Indicators, Inc.
    Inventor: Christopher Bunai
  • Patent number: 9987066
    Abstract: Methods and devices are provided for using a bone anchor driver for driving inner and outer set closure mechanisms or set screws into a bone anchor assembly. In one embodiment, a bone anchor driver is provided that includes an outer shaft configured to engage an outer set screw coupled to a bone anchor assembly, an inner shaft disposed within the outer shaft and configured to engage an inner set screw coupled to the bone anchor assembly, and a torque limiting mechanism configured to automatically switch between a first position in which it is disengaged from the inner shaft and is engaged with the outer shaft, and a second position in which it is disengaged from the outer shaft and is engaged with the inner shaft.
    Type: Grant
    Filed: December 15, 2014
    Date of Patent: June 5, 2018
    Assignee: Medos International Sarl
    Inventors: Shawn Stad, Nils Schmuckli
  • Patent number: 9908232
    Abstract: A torsion output tool has a housing, a motor and a transmission assembly. The transmission assembly includes a first planetary gear train. The first planetary gear train has a first planetary gear carrier, a first level planetary gear, a first inner ring gear disposed outside the first level planetary gear and meshing therewith, and a first central wheel sliding in a direction of a first axis to a first position and a second position. The transmission assembly further has a locking member. The locking member slides synchronously with the first central wheel and only locks the relative circumferential positions of the output shaft and the first planetary gear carrier when the first central wheel is at the first position and only constitutes circumferential engagement with the first planetary gear carrier when the first central wheel is at the second position to achieve a drilling mode and an impact mode of operation for the tool.
    Type: Grant
    Filed: June 25, 2015
    Date of Patent: March 6, 2018
    Assignee: Chervon (HK) Limited
    Inventor: Cuihua Chen
  • Patent number: 9903201
    Abstract: A cutting tool system is provided that includes a locking collar and a bit attachment member. The locking collar is compressible radially inwardly and has a tapering outer surface. The bit attachment member has a tapering inner surface constructed to receive and interface with the outer surface of the locking collar. According to an embodiment, a first groove in the outer surface of the locking collar is alignable with a second groove of the bit attachment member to form a perimeter of a pin receptacle in which is pin is insertable to prevent relative rotation between the locking collar and the bit attachment member. According to another embodiment, the cutting tool system further includes a retainer plate and fasteners constructed to secure the retainer plate directly to the locking collar and to the driving shaft, and to cause inward compression of the locking collar.
    Type: Grant
    Filed: December 11, 2015
    Date of Patent: February 27, 2018
    Assignee: Antraquip Corporation
    Inventor: Thomas Mitterndorfer
  • Patent number: 9873191
    Abstract: The invention relates to a power drill, having a tool-clamping device that is coupled to a drive motor via a drive shaft and a torque clutch equipped with a transmission element. The torque clutch has a clutch-adjusting ring that cooperates at least indirectly with at least one clamping element that exerts a prestressing force on the transmission element. An end of the drive shaft oriented toward the tool-clamping device is guided in a bearing that axially fixes the drive shaft in a drilling or screwdriving position and axially releases the drive shaft in an impact drilling position. The bearing cooperates with a bearing holder, which moves the bearing axially via a user-actuatable actuating element. According to the invention, the actuating element is coupled to an adjusting element that axially fixes the transmission element and axially releases the bearing in the impact drilling position and axially releases the transmission element and axially fixes the bearing in the drilling or screwdriving position.
    Type: Grant
    Filed: March 28, 2014
    Date of Patent: January 23, 2018
    Assignee: ROBERT BOSCH GMBH
    Inventor: Tobias Herr
  • Patent number: 9808868
    Abstract: A hand-held power tool is provided which includes a clutch housing of a torque clutch, and a planetary gear, situated in a gear housing, for transmitting a torque which is generated by a drive motor to a drive shaft. The clutch housing cooperates with the planetary gear via a pressure plate. The pressure plate is displaced in the axial direction in order to disengage the torque clutch. The axial relative motion of the pressure plate causes an axial relative motion between a switching element and an associated optical sensor, via which the drive motor may be switched off.
    Type: Grant
    Filed: October 24, 2014
    Date of Patent: November 7, 2017
    Assignee: ROBERT BOSCH GMBH
    Inventors: Martin Kraus, Heiko Roehm, Joachim Hecht
  • Patent number: 9776316
    Abstract: A power tool, in particular a hand-held power tool, preferably embodied as a cordless screwdriver, is equipped with a torque limiting unit in which the release torque is settable by way of a locking brace that is equipped with a spring brace for locking elements that abut axially against parts of a planetary drive, in particular the ring gear thereof or the planet carrier thereof as a last gear stage, the spring elements of the spring brace and the locking elements being located with a radial offset from one another.
    Type: Grant
    Filed: April 8, 2015
    Date of Patent: October 3, 2017
    Assignee: ROBERT BOSCH GMBH
    Inventors: Joachim Hecht, Heiko Roehm, Martin Kraus
  • Patent number: 9737984
    Abstract: It is an object of the invention to provide a technique for enhancing the operability of a power tool. A representative screwdriver 100 is provided which has a motor 110 and a driving mechanism 120. The driving mechanism 120 has a rotation transmitting mechanism including a driving cam 137 and a driven cam 157, and a cam engagement state is switched by movement of the spindle 150 in a longitudinal direction of the spindle. The position of the spindle 150 in the longitudinal direction is detected by a detecting mechanism 162 that is disposed on the opposite side of the rotation transmitting mechanism from a front end region in the longitudinal direction of the spindle 150. A controller 180 controls the rotation speed of the motor 110 based on the detection result of the detecting mechanism 162 and drives the motor 110.
    Type: Grant
    Filed: November 6, 2014
    Date of Patent: August 22, 2017
    Assignee: MAKITA CORPORATION
    Inventors: Hirokatsu Yamamoto, Takaaki Osada, Manabu Sugimoto
  • Patent number: 9731410
    Abstract: To provide a hand-held power tool which is equipped with a motor and can be used in a normal driving mode for a tip end tool and also in driving modes other than the normal driving mode. A power tool in which a tip end tool is driven by a motor to thereby perform a predetermined machining process on a workpiece, wherein the motor is a dual rotor motor comprising: an inner rotor; an outer rotor; and a stator including a driving coil mechanism, with the inner rotor and the outer rotor being coaxially disposed.
    Type: Grant
    Filed: November 28, 2011
    Date of Patent: August 15, 2017
    Assignee: MAKITA CORPORATION
    Inventors: Shinji Hirabayashi, Kenichi Ota
  • Patent number: 9731408
    Abstract: According to one aspect of the application, a device for driving a fastening element into a substrate has an energy-transfer element for transferring energy to the fastening element. The energy-transfer element can move preferably between a starting position and a setting position, wherein the energy-transfer element is located, before a driving-in procedure, in the starting position and, after the driving-in procedure, in the setting position. According to another aspect of the application, the device comprises a mechanical-energy storage device for storing mechanical energy. The energy-transfer element is then suitable preferably for transferring energy from the mechanical-energy storage device to the fastening element.
    Type: Grant
    Filed: June 13, 2011
    Date of Patent: August 15, 2017
    Assignee: HILTI AKTIENGESELLSCHAFT
    Inventors: Stefan Groer, Wolfgang Beck, Klaus Bertsch
  • Patent number: 9592593
    Abstract: A torsion-adjustable impact wrench, includes a housing, a powering unit including an impact mechanism configured to generate an intermittently increasing torque, an adjusting unit configured to manually set a first torsion value and generate a corresponding a first torsion signal, a detecting unit configured to detect a rotational speed of the powering unit and generate a corresponding first rotational speed signal, and a control unit configured to generate a control signal for controlling the output of the rotational speed of the powering unit. The control unit generates a second rotational speed signal according to the first torsion signal outputted by the adjusting unit, compares the first rotational speed signal with the second rotational speed signal, and generates a control signal enabling the rotational speed of the powering unit to approach the second rotational speed.
    Type: Grant
    Filed: March 1, 2013
    Date of Patent: March 14, 2017
    Assignee: Chervon (HK) Limited
    Inventors: Liang Chen, Wu Chen, Jianwen Yang, Qiwei Zhou
  • Patent number: 9579776
    Abstract: An electric power tool includes a voltage step-up condition setting operation unit that serves as a human machine interface and a voltage converter capable of performing a voltage step-up operation to raise a voltage supplied from a power supply and supply a raised voltage to a motor. The voltage converter is further capable of changing a voltage step-up level in the voltage step-up operation in accordance with the operation of the voltage step-up condition setting operation unit. A driving state detection unit generates a driving state signal corresponding to a driving state of the electric power tool. A control unit controls a stop timing of the motor in accordance with the driving state signal.
    Type: Grant
    Filed: March 10, 2014
    Date of Patent: February 28, 2017
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Tadashi Arimura, Toshiharu Ohashi, Hiroyuki Kaizo, Fumiaki Sekino, Kenichirou Inagaki
  • Patent number: 9555525
    Abstract: A rotation speed control method for impact type fastening tools has a presetting step and a dynamic control step. The presetting step includes setting a plurality of working positions, and setting a PWM signal with a larger duty cycle as a driving signal in a period after energization so that a motor can rotate at a higher speed and improve work efficiency. When a main controller judges, according to feedback, that the operation enters an impact phase and torsion control is needed to reduce rotation speed, the main controller makes adjustment by driving the motor with a PWM signal with a lower duty cycle corresponding to a working position currently set by the user. The control method improves work efficiency, and meet the user's need of driving a fastener with a higher rotation speed at an early stage of operation.
    Type: Grant
    Filed: April 29, 2014
    Date of Patent: January 31, 2017
    Assignee: Chervon (HK) Limited
    Inventors: Shuming Wu, Liang Chen, Wu Chen
  • Patent number: 9555536
    Abstract: A two-stage locking electric screwdriver, with its main improved features as follow: the electric screwdriver has pre-locking and locking functions; the torque settings of the electric screwdriver can be easily modulated, and meanwhile the torque accuracy and energy efficiency can be improved; the torque modulation type is external modulation, so that the torque modulation can be carried out externally and even the torsion spring can be replaced. Meanwhile, the component structures inside the electric screwdriver is improved through a design that the motor directly drives the clutch and then drive the screwdriver head unit, and that an internal gear clutch is used to replaced the gear unit and clutch unit, so that the number of parts is dramatically reduced to save production cost. During general rotation, the electric screwdriver will not drive the clutch unit, and when the torque jumps to the set value, the internal gear clutch rotates and generates a torque.
    Type: Grant
    Filed: June 5, 2014
    Date of Patent: January 31, 2017
    Inventor: Hsiu-Lin Hsu
  • Patent number: 9533678
    Abstract: A method of controlling a hybrid drive-train of a vehicle having a combustion engine with a driveshaft, a transmission with an input shaft and an output shaft that drives a transfer box. An electric machine has a rotor that is connected to the transmission input shaft. A separator clutch is arranged between the engine driveshaft and the transmission input shaft. For coupling of the engine, the engine is first accelerated, with a rotational speed regulation, toward a target speed until a reference speed is reached or exceeded while the clutch remains disengaged, then, with continuous speed regulation, the engine is adjusted to a corrected target speed while the clutch is engaged until a target torque is obtained, then, with torque control, the engine is adjusted to the target torque while the clutch, with differential rotational speed regulation, is regulated to a target speed difference, and finally the clutch is engaged.
    Type: Grant
    Filed: June 14, 2012
    Date of Patent: January 3, 2017
    Assignee: Friedrichshafen AG
    Inventors: Jakob Scholz, Tobias Zollner, Holger Bacher
  • Patent number: 9192394
    Abstract: A surgical handpiece with a rotating spindle for receiving the coupling head of a surgical attachment or a cutting accessory. A gear train has plural drive heads that simultaneously rotate at different speeds. A clutch assembly has pins that move along the length of the spindle. The clutch assembly sets the position of the pins so they will engage one of the drive heads. The spindle rotates with the drive head with which the clutch pins are engaged.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: November 24, 2015
    Assignee: STRYKER CORPORATION
    Inventor: Krishnamurthy Belagali
  • Patent number: 9162350
    Abstract: A torque-limiting driver has a handle, a body, a torque-limiting assembly and a work-piece engaging tip. The torque-limiting assembly includes an upper and lower shank that have a plurality of teeth circumferentially spaced. The teeth have a vertical face, an inclined face, and a flat peak. There is a spring for applying pressure across the upper and lower shank with multiple washers interposed between the lower shaft and spring. In some instances, there is a round square drive with arched catches having preselected radii to assure operation over certain cycles at selected torque and to reduced nose cone damage and breakage at a predetermined inch pounds of torque.
    Type: Grant
    Filed: July 26, 2011
    Date of Patent: October 20, 2015
    Assignee: ECA Medical Instruments
    Inventors: John Nino, David Ivinson
  • Patent number: 9089956
    Abstract: An impact power tool includes an impact mechanism for applying a striking impact to an output shaft by using an output power of a motor. A strike detection unit detects the striking impact applied by the impact mechanism to obtain a striking timing and a striking speed detection unit calculates a striking speed from the striking timing obtained by the strike detection unit and a rotation angle of the motor obtained by a rotation angle detection unit. A control unit counts the number of striking impact detected by the strike detection unit and stops the motor if the number of striking impact reaches a predetermined strike number. The control unit is designed to correct the predetermined strike number when the striking speed obtained in the striking speed detection unit is equal to or lower than a specified striking speed.
    Type: Grant
    Filed: September 12, 2008
    Date of Patent: July 28, 2015
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Tadashi Arimura, Mitsumasa Mizuno, Toshiharu Ohashi, Masaaki Sakaue
  • Patent number: 9038743
    Abstract: A hand-held power tool has a tool body, a motor housed in the tool body and a grip part designed to be held by a user, and performs a predetermined operation on a workpiece by a tool bit rotationally driven by the motor. The power tool includes a clutch that transmits torque and interrupts torque transmission between the motor and the tool bit, a non-contact torque sensor that detects torque acting on the tool bit in non-contact with a rotation axis rotating together with the tool bit, and a clutch control system that controls coupling and decoupling of the clutch according to a torque value detected by the non-contact torque sensor.
    Type: Grant
    Filed: March 19, 2010
    Date of Patent: May 26, 2015
    Assignee: MAKITA CORPORATION
    Inventor: Yonosuke Aoki
  • Patent number: 9027666
    Abstract: A power tool, in particular a hand-held power tool, preferably embodied as a cordless screwdriver, is equipped with a torque limiting unit in which the release torque is settable by way of a locking brace that is equipped with a spring brace for locking elements that abut axially against parts of a planetary drive, in particular the ring gear thereof or the planet carrier thereof as a last gear stage, the spring elements of the spring brace and the locking elements being located with a radial offset from one another.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: May 12, 2015
    Assignee: Robert Bosch GmbH
    Inventors: Joachim Hecht, Heiko Roehm, Martin Kraus
  • Publication number: 20150114675
    Abstract: A hand-held power tool is provided which includes a clutch housing of a torque clutch, and a planetary gear, situated in a gear housing, for transmitting a torque which is generated by a drive motor to a drive shaft. The clutch housing cooperates with the planetary gear via a pressure plate. The pressure plate is displaced in the axial direction in order to disengage the torque clutch. The axial relative motion of the pressure plate causes an axial relative motion between a switching element and an associated optical sensor, via which the drive motor may be switched off.
    Type: Application
    Filed: October 24, 2014
    Publication date: April 30, 2015
    Inventors: Martin KRAUS, Heiko ROEHM, Joachim HECHT
  • Patent number: 9014933
    Abstract: An electric tool has a housing, a motor disposed in the housing, an output shaft, a first planetary gear transmission mechanism, having a power input member, disposed between the motor and the output shaft, and a locking mechanism, having a power output member. The locking mechanism has a locked state and an unlocked state. When torsion is transmitted from the motor to the output shaft, the locking mechanism is in the unlocked state, and the output shaft is driven by the motor to rotate to perform electric operation. When the output shaft reversely receives a force, the locking mechanism is in the locked state, and the power input member of the first planetary gear transmission member is locked to perform manual operation.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: April 21, 2015
    Assignee: Chervon (HK) Limited
    Inventors: Liang Chen, Wu Chen
  • Patent number: 8955617
    Abstract: A hand-held power tool includes a gearbox that is coupled to a spindle for receiving a tool, the spindle being mounted via a tool-side bearing and a motor-side bearing, and the motor-side bearing being braced radially against a component of the gearbox.
    Type: Grant
    Filed: August 12, 2009
    Date of Patent: February 17, 2015
    Assignee: Robert Bosch GmbH
    Inventor: Heiko Roehm
  • Publication number: 20150034350
    Abstract: The present invention provides a rotational force transmitting device including: an inertia wheel 100 connected to an output gear 22 rotating engagedly with a driving motor 11 and rotating by receiving the rotational force of the driving motor 11; a spindle 200 coupled freely rotatable to the center of the front surface of the inertia wheel 100; a power transmitting eccentric body 210 extended vertically with respect to the rotary shaft of the spindle 200 from one side of the spindle 20; an insert pin 300 inserted into a guide hole 110 formed passed through the front and rear surfaces of the inertia wheel 100; a position restoring spring 320 inserted into the guide hole 110, for elastically supporting the insert pin 300 in a backward direction; and a balance weight 400 coupled rotatably to the rear surface of the inertia wheel 100, for supporting the rear end periphery of the insert pin 300, the balance weight 400 rotating with the centrifugal force generated by the rotation of the inertia wheel 100 to push t
    Type: Application
    Filed: June 20, 2012
    Publication date: February 5, 2015
    Inventor: Moo Young Yun
  • Patent number: 8944181
    Abstract: A driving section generates rotational driving force and has an output shaft that outputs the rotational driving force. An end-bit mounting section holds an end bit and is rotatable about a rotational axis. A friction clutch is provided between the end-bit mounting section and the driving section. The friction clutch includes a drive member and a follow member. The drive member rotates together with the driving section and has a drive-side contact surface. The follow member rotates together with the end-bit mounting section and has a follow-side contact surface contactable with the drive-side contact surface. The friction clutch is movable between a transmission position where frictional force is produced between the drive-side contact surface and the follow-side contact surface so that the output shaft and the end-bit mounting section can rotate together, and a cutoff position where the output shaft and the end-bit mounting section are non-rotatable together.
    Type: Grant
    Filed: October 2, 2008
    Date of Patent: February 3, 2015
    Assignee: Hitachi Koki Co., Ltd.
    Inventor: Shinichiro Sato
  • Patent number: 8944179
    Abstract: A power tool that includes a driving motor and a power transmitting mechanism. The power transmitting mechanism includes a first clutch cam part, a second clutch cam part, clutch teeth, a clutch detecting mechanism and a controller that can control the driving motor in a first control mode in which the driving motor is controlled to rotate at a first rotation speed until before the first and second clutch cam parts are engaged with each other at the clutch teeth and in a second control mode in which the driving motor is controlled to rotate at a second rotation speed higher than the first rotation speed after the first and second clutch cam parts are engaged with each other at the clutch teeth.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: February 3, 2015
    Assignee: Makita Corporation
    Inventors: Tomohiro Ukai, Yuta Matsuura, Takamasa Hanai, Junpei Kamimoto, Akihiro Ito
  • Patent number: 8939228
    Abstract: In a clutch mechanism of a percussion driver drill, a plurality of engageable members held in a gear case is configured to be engageable with an end face of a final-stage internal gear, and a coil spring is configured to press the engageable members against the end face of the internal gear. The coil spring is disposed frontwardly of the engageable members between a switch member and an operating member of a vibration mechanism. A coupling member connected with the switch member and the operating member is disposed to pass through a gap between the plurality of engageable members and detour around a rear end of the coil spring.
    Type: Grant
    Filed: March 1, 2012
    Date of Patent: January 27, 2015
    Assignee: Makita Corporation
    Inventor: Tomoyuki Kondo
  • Patent number: 8893819
    Abstract: The invention relates to a hand-held power tool with a drive shaft embodied in the form of a spindle shaft, which is connected to a tool-clamping device. The drive shaft, which is coupled to a drive motor, cooperates with a torque clutch. The torque clutch is provided with a clutch-adjusting ring that is coupled to a transmission element that cooperates with at least one clutch-adjusting device in order to adjust a torque. The transmission element is situated in an axially and/or radially movable fashion on the outer circumference of a housing component. According to the invention, in at least one position of the clutch-adjusting ring, the transmission element protrudes axially beyond the housing component in the direction toward the tool-clamping device.
    Type: Grant
    Filed: November 22, 2010
    Date of Patent: November 25, 2014
    Assignee: Robert Bosch GmbH
    Inventor: Tobias Herr
  • Patent number: 8881842
    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: Grant
    Filed: February 13, 2008
    Date of Patent: November 11, 2014
    Assignee: Positec Power Tools (Suzhou) Co., Ltd.
    Inventors: Gianni Borinato, Jiancheng Shen
  • Patent number: 8857536
    Abstract: The invention describes a hand-held power tool having a drive train, which includes a motor with a rotor, a drive shaft, and a transmission. According to the invention, at least one flywheel mass is provided that is positionable rotationally symmetrical to the drive shaft and connectable to the drive shaft for co-rotation therewith.
    Type: Grant
    Filed: November 22, 2010
    Date of Patent: October 14, 2014
    Assignee: Robert Bosch GmbH
    Inventors: Jens Brennenstuhl, Ralf Windsheimer, Heiko Roehm
  • Patent number: 8851201
    Abstract: A power tool includes a housing, a motor supported in the housing, a transmission operably coupled to the motor, an output shaft rotatable about a central axis, a clutch mechanism including a resilient member, and a clutch mechanism adjustment assembly having a first ring rotatable about the central axis. The first ring includes a cam surface spaced from the central axis in a radial direction. The clutch mechanism adjustment assembly also includes a second ring coaxial with the first cam ring and in facing relationship with the cam surface, and a cam member disposed between the cam surface and the second ring. In response to rotation of the first ring relative to the second ring, the cam member engages the cam surface to displace the first ring relative to the second ring and compress the resilient member to increase the amount of torque transferred to the output shaft.
    Type: Grant
    Filed: August 6, 2009
    Date of Patent: October 7, 2014
    Assignee: Milwaukee Electric Tool Corporation
    Inventors: Kurt Limberg, Roger D. Neitzell, Terry Timmons
  • Publication number: 20140262404
    Abstract: An electric power tool includes a motor having a drive shaft, a tool output shaft rotated by rotational force of the drive shaft, a clutch unit that connects or disconnects a torque transmission line between the drive shaft and the tool output shaft according to load torque of the tool output shaft, a load detector that outputs a load torque signal in accordance with the load torque of the tool output shaft, and a control unit that performs a rising detection mode, which detects rising of the load torque signal to stop rotation of the motor, and a falling detection mode, which detects falling of the load torque signal to stop rotation of the motor. The control unit selects the rising detection mode or the falling detection mode according to a usage condition signal indicating a usage condition of the electric power tool.
    Type: Application
    Filed: March 5, 2014
    Publication date: September 18, 2014
    Applicant: Panasonic Corporation
    Inventors: Fumiaki SAWANO, Hiroshi MIYAZAKI, Hidenori SHIMIZU
  • Patent number: 8833484
    Abstract: A control method for a power tool and a power tool is disclosed. The control method has an operating mode and a safety mode. In the operating mode, a motor drives a tool receptacle in a rotating manner. In the operating mode, the motor has a power consumption in the amount of at least an operating value. The safety mode is triggered if a sensor device detects a rotational blockade of the tool receptacle. In the safety mode, a clutch that is switchable by electrical signals located in the drive train between the motor and tool receptacle is periodically opened and closed and a power consumption of the motor is reduced as compared to the operating value.
    Type: Grant
    Filed: October 25, 2011
    Date of Patent: September 16, 2014
    Assignee: Hilti Aktiengesellschaft
    Inventors: Albert Binder, Dieter Profunser, Alexander Hoop
  • Patent number: 8776910
    Abstract: Embodiments of clutches for electric pole saws, and related methods, are disclosed herein. An electric pole saw may include an electric motor, a drive shaft coupled between the electric motor and a cutting instrument, and a clutch coupled between the electric motor and the drive shaft. The clutch may include a motor portion having an exterior surface, a drive shaft portion having an exterior surface and forming a mated assembly when mated with the motor portion, and a spring around the motor and drive shaft portions. The spring may exert a holding force on the mated assembly, such that rotation of the motor portion in a first direction loosens the spring and reduces the friction holding force until a torque between the motor and drive shaft portions exceeds the holding force, causing rotation of the motor portion to be decoupled from rotation of the drive shaft portion.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: July 15, 2014
    Assignee: Blount, Inc.
    Inventors: Edgar A. Dallas, Evan Pickett
  • Patent number: 8763722
    Abstract: The invention relates to a power tool, in particular an electrically operable hand-held power tool, having at least one tool drive shaft for direct or indirect rotary drive of an insert bit, with the insert bit being accommodated in a tool holder that is connected or detachably connected to the tool drive shaft, particularly in a replaceable fashion. At least one drive device and at least one clutch device that couples the at least one drive device to the at least one tool drive shaft is provided which has at least two different, user-selectable, limit torques. An actuating device is provided that makes it possible, with a replacement of the insert bit and/or a replacement of the tool holder, to reset the clutch device to a lower limit torque, preferably to the lowest possible limit torque.
    Type: Grant
    Filed: November 21, 2008
    Date of Patent: July 1, 2014
    Assignee: Robert Bosch GmbH
    Inventors: Willy Braun, Juergen Lennartz
  • Patent number: 8739893
    Abstract: The invention relates to a multi-gear transmission device, particularly a two-gear transmission device, for transferring a drive torque from an input side to an output side, which transmission device has at least two selectable gear ratios. The multi-gear transmission device further has a multi-stage clutch device, particularly a two-stage clutch device, with at least two different, selectable limit torques. According to the invention, the multi-stage transmission device has at least two preferably switchable translating gear pairs, and the multi-stage clutch device is included in the translating gear pairs.
    Type: Grant
    Filed: November 21, 2008
    Date of Patent: June 3, 2014
    Assignee: Robert Bosch GmbH
    Inventor: Willy Braun
  • Publication number: 20140144661
    Abstract: In a hand-held power tool having a transmission and a torque clutch, which has a torque limiting coupling associated with the transmission and with which a limiting transfer element is associated, to which at least one spring element is axially applied in the direction of the torque limiting coupling, a torque level of the torque clutch being settable via a user-operable operating element at least within predefined limits, the torque limiting coupling has at least one roller-shaped latch member.
    Type: Application
    Filed: November 27, 2013
    Publication date: May 29, 2014
    Applicant: ROBERT BOSCH GMBH
    Inventors: Heiko ROEHM, Ralf WINDSHEIMER
  • Patent number: 8720598
    Abstract: The invention relates to a power drill, having a tool-clamping device that is coupled to a drive motor via a drive shaft and a torque clutch equipped with a transmission element. The torque clutch has a clutch-adjusting ring that cooperates at least indirectly with at least one clamping element that exerts a prestressing force on the transmission element. An end of the drive shaft oriented toward the tool-clamping device is guided in a bearing that axially fixes the drive shaft in a drilling or screwdriving position and axially releases the drive shaft in an impact drilling position. The bearing cooperates with a bearing holder, which moves the bearing axially via a user-actuatable actuating element. According to the invention, the actuating element is coupled to an adjusting element that axially fixes the transmission element and axially releases the bearing in the impact drilling position and axially releases the transmission element and axially fixes the bearing in the drilling or screwdriving position.
    Type: Grant
    Filed: November 22, 2010
    Date of Patent: May 13, 2014
    Assignee: Robert Bosch GmbH
    Inventor: Tobias Herr
  • Patent number: 8708861
    Abstract: An electric power tool includes a motor; a speed reducer for transferring a rotational power of the motor at a reduced speed; and a reduction ratio changing unit for changing a reduction ratio of the speed reducer. The speed reduction mechanism includes an axially slidable changeover member and a gear member, the changeover member being engaged with or disengaged from the gear member depending on an axial slide position thereof. The reduction ratio changing unit includes a shift actuator for axially sliding the changeover member, a driving state detector for detecting a driving state of the motor, a slide position detector for detecting a slide position of the changeover member and a controller for driving the shift actuator and for temporarily decreasing or increasing a rotational power of the motor depending on detection results of the driving state detector and the slide position detector, respectively.
    Type: Grant
    Filed: June 22, 2011
    Date of Patent: April 29, 2014
    Assignee: Panasonic Corporation
    Inventors: Kenichirou Inagaki, Yutaka Yamada, Tadashi Arimura, Masatoshi Atsumi, Hiroyuki Kaizo
  • Patent number: 8708060
    Abstract: A synchronization mechanism of a clutch mechanism includes a drive side contact member and a driven side contact member provided on a drive side clutch member and a driven side clutch member of a clutch mechanism at positions radially inwardly of a drive side clutch portion and a driven side clutch portion, respectively. The driven side contact member does not contact the drive side contact member when the driven side clutch member is in a disengaging position. As the driven side clutch member moves from the disengaging position to an engaging position, the driven side contact member contacts the drive side contact member, so that the rotation of the drive side clutch member is transmitted to the driven side clutch member through frictional contact between the driven side contact member and the drive side contact member before the driven side clutch member reaches the engaging position.
    Type: Grant
    Filed: July 11, 2011
    Date of Patent: April 29, 2014
    Assignee: Makita Corporation
    Inventor: Kazunori Tsuge
  • Patent number: 8684105
    Abstract: A technique is provided which improves durability in a power tool having a torque transmission device. The representative power tool has a torque transmission device 151. The torque transmission device 151 includes a projection 171 formed on one of opposed surfaces of a first rotating member 153 and a second rotating member 155 and protruding in a direction of a rotational axis, a recess 161 for receiving the projection 171, which is formed in the other of the opposed surfaces and recessed in the direction of the rotational axis, a projection-side engagement surface 175a formed on the projection 171, and a recess-side engagement surface 165a formed on the recess 171. Torque is transmitted when the projection-side and recess-side engagement surfaces 175a, 165a are engaged with each other, while the torque transmission is interrupted when the projection-side and recess-side engagement surfaces 175a, 165a are disengaged from each other.
    Type: Grant
    Filed: April 19, 2011
    Date of Patent: April 1, 2014
    Assignee: Makita Corporation
    Inventors: Kiyonobu Yoshikane, Yoshitaka Machida
  • Publication number: 20140069675
    Abstract: A power tool that includes a housing, a motor, a pair of motor bearings, a transmission, an output spindle and front and rear spindle bearings. The motor is received in the housing and includes a stator and an output shaft that extends through the stator. The motor bearings support the output shaft for rotation relative to the housing and are disposed on opposite ends of the stator. The transmission is driven by the motor and includes an input pinion that is mounted to the output shaft for rotation therewith. The output spindle is driven by the transmission. The front spindle bearing is mounted to a front end of the output shaft radially between the housing and the output shaft. The rear spindle bearing is mounted to a rear end of the output spindle and a portion of the rear spindle bearing rotates with the output shaft.
    Type: Application
    Filed: November 15, 2013
    Publication date: March 13, 2014
    Applicant: Black & Decker Inc.
    Inventors: Qiang Zhang, David C. Tomayko, Sankarshan Murthy, James T. Rill