Rotary Tool Drive Having Torque Responsive Impact Patents (Class 173/93.5)
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Patent number: 11964368Abstract: An impact tool includes a housing that includes a motor housing portion, a front housing portion coupled to the motor housing portion, and a D-shaped handle portion extending from the motor housing portion in a direction opposite the front housing portion. The impact tool includes an electric motor supported in the motor housing portion, a battery pack supported by the housing for providing power to the motor, and a drive assembly for converting a continuous torque input from the motor to consecutive rotational impacts upon a workpiece capable of developing at least 1,700 ft-lbs of fastening torque.Type: GrantFiled: May 2, 2022Date of Patent: April 23, 2024Assignee: MILWAUKEE ELECTRIC TOOL CORPORATIONInventors: Jacob P. Schneider, James A. Yaccarino, Daniel R. Ertl
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Patent number: 11938594Abstract: An impact tool includes a housing including a motor housing portion and a front housing coupled to the motor housing portion, a motor supported within the motor housing portion, a battery pack supported by the housing for providing power to the motor, and a drive assembly supported within the housing and configured to convert continuous torque from the motor to consecutive rotational impacts upon a workpiece capable of developing at least 1,700 ft-lbs of fastening torque. The drive assembly includes a camshaft driven by the motor for rotation about an axis, an anvil extending from the front housing, and a hammer configured to reciprocate along a travel portion of the camshaft between a rearmost position and a forwardmost position to deliver rotational impacts to the anvil in response to rotation of the camshaft.Type: GrantFiled: October 31, 2022Date of Patent: March 26, 2024Assignee: MILWAUKEE ELECTRIC TOOL CORPORATIONInventors: Jacob P. Schneider, Evan Brown, Leonard Mikat-Stevens, Connor Temme
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Patent number: 11911887Abstract: Illustrative embodiments of impact tools with impact mechanisms rigidly coupled to electric motors are disclosed. In at least one illustrative embodiment, an impact tool may comprise an impact mechanism, an electric motor, and a control circuit. The impact mechanism may comprise a hammer and an anvil, the hammer being configured to rotate about a first axis and to periodically impact the anvil to drive rotation of the anvil about the first axis. The electric motor may comprise a rotor that is rigidly coupled to the impact mechanism, the electric motor being configured to drive rotation of the hammer about the first axis. The control circuit may be configured to supply a current to the electric motor and to prevent the current from exceeding a threshold in response to the hammer impacting the anvil.Type: GrantFiled: February 15, 2022Date of Patent: February 27, 2024Assignee: Ingersoll-Rand Industrial U.S., Inc.Inventors: Timothy R. Cooper, John J. Linehan, Edward Charles Eardley
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Patent number: 11897095Abstract: A rotary power tool includes a main housing and a transmission housing coupled to the main housing. The transmission housing includes a bearing pocket open to a front of the transmission housing and defined at least partially by a radially inward-extending flange. The rotary power tool also includes an output shaft and a bearing positioned within the bearing pocket adjacent and in abutting relationship with the radially inward-extending flange for rotatably supporting the output shaft in the transmission housing. The rotary power tool also includes a radially outward-extending flange on the output shaft that radially overlaps at least a portion of the bearing on an opposite side of the bearing as the radially inward-extending flange. A line of action of an axial reaction force applied to the output shaft is directed to the transmission housing via the radially outwardly-extending flange, the bearing, and the radially inward-extending flange.Type: GrantFiled: August 23, 2021Date of Patent: February 13, 2024Assignee: MILWAUKEE ELECTRIC TOOL CORPORATIONInventors: Mitchell Carlson, Ding Feng Hu, Zhiqiang Yu, Fanbin Zeng
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Patent number: 11794316Abstract: A screw driving tool including: a motor; an impact mechanism driven by the motor along a rotational axis and held fixed in translation along the rotational axis. the impact mechanism has: a striker system with a striker element, a square drive including at least one strike reception element, the striker element being configured to come into contact with the at least one strike reception element to generate an impact torque, the striker system being configured to be driven in rotation, along the rotational axis, on at least 200° before impact. The impact mechanism has an anti-vibrational element configured so that, during an impact: the center of gravity of the impact mechanism is appreciably positioned on the rotational axis, and the rotational axis of the impact mechanism is appreciably on its main axes of inertia.Type: GrantFiled: December 22, 2020Date of Patent: October 24, 2023Assignee: ETABLISSEMENTS GEORGES RENAULTInventor: Remi Beguin
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Patent number: 11701759Abstract: An electric power tool in one aspect of the present disclosure includes a motor, an impact mechanism, and a control circuit. The control circuit executes a motor control process. The motor control process includes limiting an output of the motor in response to establishment of a preset condition. The preset condition is based on a load applied to the motor.Type: GrantFiled: September 21, 2020Date of Patent: July 18, 2023Assignee: MAKITA CORPORATIONInventors: Itsuku Kato, Yasuhito Kawai
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Patent number: 11597061Abstract: An impact tool includes a housing extending along a longitudinal axis. The housing includes a motor housing portion, a first handle extending from the motor housing portion, and a front housing coupled to the motor housing portion opposite the first handle. The impact tool also includes a motor supported within the motor housing portion, an anvil extending from the front housing, an impact mechanism supported within the front housing, and an auxiliary handle assembly. The auxiliary handle assembly includes a mount coupled to the housing, an auxiliary handle coupled to the mount and spaced from the first handle, and an adjustment mechanism. Loosening the adjustment mechanism permits rotation of the auxiliary handle assembly about the longitudinal axis relative to the housing, and tightening the adjustment mechanism secures the auxiliary handle assembly in a selected rotational position.Type: GrantFiled: December 5, 2019Date of Patent: March 7, 2023Assignee: MILWAUKEE ELECTRIC TOOL CORPORATIONInventors: Joseph H. Ellice, Jacob P. Schneider, Andrew J. Weber, FengKun Lu, Guang Hu
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Patent number: 11511400Abstract: An impact tool includes a housing extending along a longitudinal axis. The housing includes a motor housing portion, a first handle extending from the motor housing portion, and a front housing coupled to the motor housing portion opposite the first handle. The impact tool also includes a motor supported within the motor housing portion, an anvil extending from the front housing, an impact mechanism supported within the front housing, and an auxiliary handle assembly. The auxiliary handle assembly includes a mount coupled to the housing, an auxiliary handle coupled to the mount and spaced from the first handle, and an adjustment mechanism. Loosening the adjustment mechanism permits rotation of the auxiliary handle assembly about the longitudinal axis relative to the housing, and tightening the adjustment mechanism secures the auxiliary handle assembly in a selected rotational position.Type: GrantFiled: July 9, 2021Date of Patent: November 29, 2022Assignee: MILWAUKEE ELECTRIC TOOL CORPORATIONInventors: Joseph H. Ellice, Jacob P. Schneider, Andrew J. Weber
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Patent number: 11484997Abstract: An impact tool includes a housing extending along a longitudinal axis, the housing including a motor housing portion and a front housing coupled to the motor housing portion, a motor supported within the motor housing portion, and a drive assembly supported within the housing. The drive assembly includes a camshaft driven by the motor for rotation about an axis, an anvil extending from the front housing, and a hammer configured to reciprocate along a travel portion of the camshaft between a rearmost position and a forwardmost position to deliver rotational impacts to the anvil in response to rotation of the camshaft. An axial distance between the forwardmost position and the rearmost position of the hammer is at least 20.75 millimeters, and the travel portion of the camshaft has a diameter of at least 25 millimeters.Type: GrantFiled: December 20, 2019Date of Patent: November 1, 2022Assignee: MILWAUKEE ELECTRIC TOOL CORPORATIONInventors: Jacob P. Schneider, Evan Brown, Leonard Mikat-Stevens, Connor Temme
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Patent number: 11426848Abstract: A control method for tightening a threaded connection executes, in response to actuation of a pushbutton key, a sequence with consecutive phases. In a first phase, an impact mechanism of an impact wrench exerts a predefined number of rotary impacts on the threaded connection. During the first phase, a profile of a rotational angle over time is estimated. A pattern is adapted to the profile and on the basis of the pattern a setpoint torque is determined for a second phase and a final rotational angle or a final number of impacts is determined for a third phase. During the second phase, rotary impacts are exerted until an estimated torque reaches the setpoint torque. During the third phase, rotary impacts are exerted on the threaded connection until a number of rotary impacts corresponds to the final number or a rotational angle corresponds to the final rotational angle.Type: GrantFiled: December 20, 2018Date of Patent: August 30, 2022Assignee: Hilti AktiengesellschaftInventors: Matthaeus Alberding, Dario Bralla, Antonio Orvieto
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Patent number: 11285587Abstract: Improved radial pneumatic regulator systems, devices and methods are described herein. Embodiments may comprise regulators with adaptive radial seals to prevent air leakage, provide increased air supply use efficiency, and facilitate more efficient manufacture and assembly of systems. The regulator systems may be used in applications such as for pneumatic power tools.Type: GrantFiled: February 28, 2019Date of Patent: March 29, 2022Assignee: INGERSOLL-RAND INDUSTRIAL U.S., INC.Inventors: Ryan S. Amend, Edward Charles Eardley
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Patent number: 11247321Abstract: Illustrative embodiments of impact tools with impact mechanisms rigidly coupled to electric motors are disclosed. In at least one illustrative embodiment, an impact tool may comprise an impact mechanism, an electric motor, and a control circuit. The impact mechanism may comprise a hammer and an anvil, the hammer being configured to rotate about a first axis and to periodically impact the anvil to drive rotation of the anvil about the first axis. The electric motor may comprise a rotor that is rigidly coupled to the impact mechanism, the electric motor being configured to drive rotation of the hammer about the first axis. The control circuit may be configured to supply a current to the electric motor and to prevent the current from exceeding a threshold in response to the hammer impacting the anvil.Type: GrantFiled: April 20, 2018Date of Patent: February 15, 2022Assignee: INGERSOLL-RAND INDUSTRIAL U.S., INC.Inventors: Timothy R. Cooper, John J. Linehan, Edward Charles Eardley
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Patent number: 10882166Abstract: An electric hand held pulse tool for performing tightening operations where torque is delivered in pulses to tighten screw joints. The pulse tool includes a bidirectional electric motor, an output shaft, a sensor for monitoring a parameter reflecting a delivered torque pulse, and a control unit for controlling the electric motor. The sensor provides information regarding the monitored parameter to the control unit. The control unit, during a tightening operation performed by the pulse tool in a first direction, controls the motor to provide at least one torque pulse on the output shaft in a second direction that is opposite to the first direction. The sensor monitors a parameter reflecting a delivered torque pulse on the output shaft in the second direction. The control unit also determines information about the nature and state of a joint, due to the torque pulse on the output shaft in the second direction.Type: GrantFiled: September 23, 2016Date of Patent: January 5, 2021Assignee: ATLAS COPCO INDUSTRIAL TECHNIQUE ABInventor: Daniel Per Erik Asplund
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Patent number: 10786888Abstract: A twin hammer impact tool includes a hammer spindle, an inner ring hammer sleeved on the hammer spindle, an outer ring hammer disposed around the inner ring hammer, and rolling beads. The inner ring hammer has bead grooves each having a ball half-shape, and angularly spaced-apart hammer projections. The inner ring hammer is reciprocally movable relative to the hammer spindle while rotating together with the hammer spindle. The outer ring hammer has guiding grooves. The bead grooves respectively face and open toward the guiding grooves. Each rolling bead is received within one of the bead grooves and one of the guiding grooves. An output hammer has angularly spaced engagement projections to engage the hammer projections.Type: GrantFiled: August 3, 2018Date of Patent: September 29, 2020Assignee: Techway Industrial Co., Ltd.Inventors: Fu-Hsiang Chung, Hao-Jung Yeh
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Patent number: 10759380Abstract: A belt tightener for tightening a safety belt in a vehicle includes an impulse screw drive unit to generate a greater torque than can be achieved by a mechanical coupling between a motor and the belt tightener.Type: GrantFiled: August 4, 2017Date of Patent: September 1, 2020Assignee: DAIMLER AGInventor: Till Heinrich
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Patent number: 10730175Abstract: A portable power tool, in particular an angle grinder, includes at least one electromotive drive, a first housing, and a rechargeable battery. The electromotive drive, in particular an electronically commutated motor, acts on a drive shaft, and is configured to drive a tool spindle. The first housing has at least one first housing half shell, at least one first housing part configured to receive the electromotive drive, and a second housing part that forms a handle. The battery is configured as a power source for the portable power tool. A ratio of a diameter of the electromotive drive to a diameter of the second housing part is between 0.6 and 1.1, preferably between 0.7 and 0.8.Type: GrantFiled: June 23, 2014Date of Patent: August 4, 2020Assignee: Robert Bosch GmbHInventors: Johannes Wolperding, Joachim Schadow, Florian Esenwein
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Patent number: 10500708Abstract: A power tool is provided including a gear case having a spindle, a motor case connected to a rear end of the gear case, a handle portion attached to a rear end of the motor case, and a motor housed inside the motor case. The motor includes a stator, a rotor rotationally arranged inside the stator, and a fan in rotational connection with the rotor. At least one air intake is arranged at least one of the motor case or the handle portion near the rear end of the motor case. A power module including power switches and a heat sink is housed in at least one of the motor case or the handle portion near the rear end of the motor case such that rotation of the fan causes air flow to enter through the air intake and flow near the heat sink and through the motor.Type: GrantFiled: October 13, 2016Date of Patent: December 10, 2019Assignee: Black & Decker Inc.Inventors: Joseph P. Kelleher, William F. Gallagher, Sean R. Templeton, Mark R. Poetzl, Seth M. Robinson, Marcell E. Coates, Madhur M. Purohit, Timothy J. Seeley, Joshua M. Lewis
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Patent number: 10406664Abstract: The present invention relates to the technical field of power-driven hammers, and more specifically, to an impact structure, which comprises a connecting shaft with two ends connected to first bearings and second bearings, wherein the shaft is sleeved around a control disc whose one end-face is connected to gears and the other end-face connected to a striking disc having keys along its circumference, a first stop ring around the shaft and a second stop ring around the shaft are provided respectively between the control disc and the first bearings and between the striking disc and the second bearings, and a spring is provided between the second stop ring and the striking disc; the present invention reciprocates by meshing between the control disc's driving teeth and the striking disc's driven teeth and under the spring's action in operation, effectively avoiding being stuck fast to ensure uninterrupted striking of nails.Type: GrantFiled: May 10, 2017Date of Patent: September 10, 2019Assignee: BEST ACHIEVE INDUSTRIAL LIMITEDInventors: Jiande Zhang, Hsi-Jen Jen, Yi-Tung Chiu
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Patent number: 10016881Abstract: A rotary tool includes a driving power source, a spindle formed in a columnar shape extending to a first side of an axial direction, a main hammer including a hammer pawl, an anvil including an anvil pawl engageable with the hammer pawl, a cylindrical secondary hammer disposed so as to cover an outer circumference of the main hammer, a round-columnar pin having an end portion on a second side of the axial direction positioned between the main hammer and the secondary hammer, an impacting mechanism disposed on the spindle so as to support the main hammer, and a casing. At least one end portion of the pin in the axial direction is supported in a radial direction of the pin by at least one of the spindle or the casing in such a manner that a rotation axis of the secondary hammer coincides with a rotation axis of the spindle.Type: GrantFiled: December 21, 2015Date of Patent: July 10, 2018Assignee: TJM Design CorporationInventor: Chihiro Aoyagi
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Patent number: 9685894Abstract: When a set duty Dt of a PWM signal is less than a minimum duty (Dmin) that allows for pulse induced voltage detection, the PWM signal in which a duty D1 during a predetermined period is limited to Dmin and in which a duty D2 during the other period is adjusted so as to satisfy Dt=(D1+D2)/2 is applied to the switching elements connected to one of the two phases. When the duty D2 during the other period takes a negative value, the pulse-voltage application target during the other period is changed to the switching elements connected to the other of the two phases, and the duty D1 during the predetermined period is corrected and increased so as to compensate for an actual drop in the duty D2 during the other period corresponding to a dead-time period in a complementary PWM method.Type: GrantFiled: September 12, 2014Date of Patent: June 20, 2017Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Masaki Hano, Takeshi Umetsu
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Patent number: 9555535Abstract: A rotational force transmitting device includes: an inertia wheel connected to an output gear; a spindle coupled freely rotatable to the center of the front surface of the inertia wheel; a power transmitting eccentric body extended vertically with respect to the rotary shaft of the spindle; an insert pin inserted into a guide hole, a position restoring spring inserted into the guide hole, for elastically supporting the insert pin in a backward direction; and a balance weight coupled rotatably to the rear surface of the inertia wheel, the balance weight rotating with the centrifugal force generated by the rotation of the inertia wheel to push the insert pin forward to allow the insert pin and the power transmitting eccentric body to be engaged with each other.Type: GrantFiled: June 20, 2012Date of Patent: January 31, 2017Assignees: JOONGWOO M-TECH CO., LTD.Inventor: Moo Young Yun
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Patent number: 9539715Abstract: Illustrative embodiments of controlled pivot impact tools are disclosed. In at least one illustrative embodiment, an impact tool may comprise a hammer configured to rotate about a first axis and to pivot about a second axis different from the first axis, where the hammer includes a cam groove formed in an outer surface of the hammer, an actuator coupled to the cam groove of the hammer and configured to pivot the hammer about the second axis between a disengaged position and an engaged position based on a position of the actuator along the cam groove, and an anvil configured to rotate about the first axis in response to being impacted by the hammer when the hammer is in the engaged position.Type: GrantFiled: January 16, 2014Date of Patent: January 10, 2017Assignee: Ingersoll-Rand CompanyInventor: Mark T. McClung
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Patent number: 9486908Abstract: In at least one illustrative embodiment, a rotary impact tool comprises a motor including a rotor and an input shaft coupled to the rotor for rotation therewith about an input axis, an anvil configured to be rotated about an output axis and including an output shaft, a carrier driven by the input shaft and having a passage extending through a distal end thereof, and a hammer supported and driven by the carrier and configured to impact the anvil to cause the anvil to rotate about the output axis. The anvil may comprise a blade coupled to the output shaft and configured to direct a lubricating fluid through the passage when the anvil or carrier rotates about the output axis.Type: GrantFiled: June 18, 2013Date of Patent: November 8, 2016Assignee: Ingersoll-Rand CompanyInventor: Thomas S. Dougherty
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Patent number: 9364940Abstract: A multi-mode one-way wrench includes a handle, a toothed wheel, two pawls and a switch. The handle is formed with a head and two grooves. The toothed wheel is rotationally placed in the head and formed with teeth. The first pawl is movably placed in the first groove for engagement with the toothed wheel. The second pawl is movably placed in the second groove for engagement with the toothed wheel when the first pawl is disengaged from the first pawl. The switch is operable for moving the second pawl between a first mode for engagement with the toothed wheel and a second mode kept from engagement with the toothed wheel. The first groove is biased from the second groove by an angle of 360°×(M+½)÷N, wherein N is an integer that represents the number of the teeth and M is any proper integer.Type: GrantFiled: December 17, 2013Date of Patent: June 14, 2016Inventor: Yi-Min Wu
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Patent number: 8955614Abstract: A portable pneumatic power wrench has a housing with a handle, a motor, a pressure air inlet passage, and an outlet passage for ducting exhaust air from the motor out of the housing. An outlet unit is connected to the outlet passage and has a first outlet opening section forming a main exhaust air flow path, a second outlet opening section forming an additional exhaust air flow path, and a manually operable valve arranged to control the additional exhaust air flow path by opening or closing the second outlet opening section. The total outlet flow area of the main exhaust air flow path and the additional exhaust air flow path gives an augmented torque output of the power wrench.Type: GrantFiled: March 24, 2010Date of Patent: February 17, 2015Assignee: Atlas Copco Industrial Technique AktiebolagInventor: Knut Christian Schoeps
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Patent number: 8950508Abstract: A handheld power tool, including a tool socket on a drive shaft for purposes of holding a tool, the drive shaft executing a rotating and partially tangentially striking movement using a tangential striking mechanism drivable by a drive. The tangential striking mechanism has an anvil associated with the drive shaft and a hammer associated with the drive, movable with respect to each other so as to strike each other axially when under the effect of the force of at least one first spring, and to strike each other tangentially when the anvil and the hammer are rotated. The hammer has a main mass, and an extra mass that is under the effect of a second spring couplable to the main mass.Type: GrantFiled: November 25, 2011Date of Patent: February 10, 2015Assignee: Hilti AktiengesellschaftInventors: Alexander Hoop, Hans Boeni, Dieter Profunser, Peter Brugger
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Patent number: 8925645Abstract: An oil pulse tool includes a motor, an oil pulse unit, an output shaft on which a front end tool is attached, a torque detecting sensor for detecting generation of an impact torque, and an operating portion configured to detect a time period between a first impact torque detected by the torque detecting sensor and a second impact torque detected by the torque detecting sensor. The second impact torque is smaller than the first impact torque. The operating portion carries out a notification when the time period between the first impact torque and the second impact torque is less than a predetermined evaluation value for the time period between the first impact torque and the second impact torque.Type: GrantFiled: May 8, 2009Date of Patent: January 6, 2015Assignee: Hitachi Koki Co., Ltd.Inventors: Tetsuhiro Harada, Tomomasa Nishikawa, Kazutaka Iwata, Shinki Ohtsu, Nobuhiro Takano
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Patent number: 8910728Abstract: In an electric power tool in which a metal front housing that accommodates a driving mechanism is assembled to the front of a main housing that accommodates a motor, an output shaft is protruded from the distal end of the front housing, and the outer periphery of the front housing is protected by a cylindrical transparent cover made of synthetic resin, a decorative pattern is formed on the inner surface of the transparent cover. The decorative pattern is formed of bumps and dips formed on the inner surface.Type: GrantFiled: July 11, 2011Date of Patent: December 16, 2014Assignee: Makita CorporationInventor: Shinsuke Okuda
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Patent number: 8857535Abstract: A sleeve body with bearings interposed between the sleeve body and a center shaft portion is integrally coupled to an oil pulse generator. A coupling body is rotatable together with the output portion. Balls are fitted between an outer surface of the sleeve body and an inner surface of the coupling body. Cam grooves are L-shaped in plan view, and formed in a portion of the outer surface of the sleeve body at which the balls are fitted. Rotation of the output portion is transmitted from the coupling body to the sleeve body and the oil pulse generator via the balls. When rotational speed between the sleeve body and the coupling body is different, the balls relatively turn in the cam grooves to move the coupling body forward against an urging force of the coil spring so as to relieve an impact.Type: GrantFiled: May 25, 2011Date of Patent: October 14, 2014Assignee: Makita CorporationInventor: Manabu Sugimoto
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Patent number: 8839879Abstract: An anvil assembly for a tool includes an anvil having a body with an outer periphery and a head formed on a distal end of the body. The anvil assembly also includes a sleeve surrounding at least a portion of the outer periphery of the body. The sleeve has a distal end against which a tool element is abutted when the tool element is coupled to the head.Type: GrantFiled: May 7, 2009Date of Patent: September 23, 2014Assignee: Milwaukee Electric Tool CorporationInventors: William A. Elger, Matthew T. Bertsch
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Patent number: 8827003Abstract: To ensure that a hammer can retract by a sufficient amount without interfering with a washer receiving a rear end of a coil spring, there is disclosed an impact driver having a washer receiving a rear end of a coil spring biasing a hammer of an impact mechanism to an advanced position. The washer is annular with an inner diameter larger than an inner diameter of an annular groove disposed on a rear surface of the hammer, and includes a frontward extended portion disposed at an inner circumference of the washer. Between a carrier portion of the spindle and the washer, there is disposed a positioner that positions the washer coaxially with the spindle.Type: GrantFiled: May 25, 2011Date of Patent: September 9, 2014Assignee: Makita CorporationInventors: Hidenori Nagasaka, Ryunosuke Kumagai
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Publication number: 20140158388Abstract: Illustrative embodiments of torque-limited impact tools are disclosed. An impact tool may include a shaft adapted to rotate about an axis, a hammer having a hammer jaw with an obtuse impact surface, and an anvil having an anvil jaw with an acute impact surface. The shaft may include a first helical groove, and the hammer may include a second helical groove. The impact tool may further include a ball received in the first and second helical grooves, wherein the ball rotationally couples the hammer to the shaft and permits axial travel of the hammer relative to the shaft. The obtuse impact surface of the hammer jaw may be adapted to impact the acute impact surface of the anvil jaw when the shaft rotates in a first direction.Type: ApplicationFiled: December 12, 2012Publication date: June 12, 2014Applicant: INGERSOLL-RAND COMPANYInventor: Joshua Odell Johnson
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Publication number: 20140124229Abstract: An impact tool has a hammer (5) to be driven by a motor for revolution and an anvil (6) impacted with the revolution by the hammer (5) and transmitting an impact force to a tip tool. Between the motor and the hammer (5), first and second ring gears (41A, 42A) are provided, and first and second planetary gear mechanisms (41) and (42) are arranged to transmit the rotary force of the motor to the hammer (5). The motor, the hammer (5), the anvil (6), and the first and second ring gears (41A, 42A) are accommodated in a housing (2). The second ring gear (42A) is movable between a holding position where the second ring gear (42A) is held as being engaged with the housing (2) and a non-holding position where the second ring gear (42A) is not engaged with the housing (2) and is revolvable with respect to the housing (2).Type: ApplicationFiled: August 30, 2012Publication date: May 8, 2014Applicant: HITACHI KOKI CO., LTD.Inventors: Shigeru Takahashi, Katsuhiro Oomori
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Publication number: 20140124228Abstract: An electric torque delivering impulse tool includes a housing with a front end and a back end, an electric torque delivering motor with a rotor that is arranged to rotate with respect to a stator, an output shaft arranged at the front end of the housing, and a pulse unit intermittently coupling the motor to the output shaft, wherein the pulse unit includes an inertia drive member that is connected to the rotor. The rotor and the inertia drive member are rigidly assembled to each other without play so as to form one integrated rotatable structure which is mounted as one single unit inside the housing.Type: ApplicationFiled: June 14, 2012Publication date: May 8, 2014Applicant: ATLAS COPCO INDUSTRIAL TECHNIQUE ABInventors: Erik Markus Peder Kviberg, Anders Urban Nelson
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Patent number: 8678106Abstract: A rotary impact tool includes: a hammer rotating by receiving a rotational force of a motor; an anvil rotating by receiving a rotational force of the hammer; and an end tool attached to the anvil, the rotary impact tool being constructed such that when a torque of a value not less than a predetermined value is applied to the anvil from the outside, the hammer is disengaged from the anvil to rotate idle and applies an impact to the anvil in a rotational direction after rotating idle by a predetermined angle, the rotary impact tool including an impact detector configured to detect impacts and a speed switching device configured to switch the rotational speed of the motor, and when the impact detector detects an impact during rotation of the anvil in a tightening direction, the speed switching device switches the rotational speed of the motor from a normal speed to a low speed.Type: GrantFiled: January 14, 2010Date of Patent: March 25, 2014Assignee: Makita CorporationInventors: Yutaka Matsunaga, Hirokatsu Yamamoto, Katsuna Hayashi, Yoshitaka Ichikawa
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Patent number: 8651198Abstract: A spindle lock device includes an engaging ring fixed in position relative to a body case of an impact screwdriver. A flat relief surface is definable on an outer circumference of the anvil that can be disposed inside of the engaging ring. An engaging member can be disposed between the engaging ring and the flat surface of the anvil. The engaging member can wedge between the engaging ring and an end portion in the circumferential direction of the relief surface of the anvil, so that the anvil is locked with respect to rotation relative to the body case.Type: GrantFiled: April 18, 2007Date of Patent: February 18, 2014Assignee: Makita CorporationInventor: Miyabi Ito
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Patent number: 8631880Abstract: A power tool with a housing, a motor, a transmission, a spindle and an impact mechanism. The motor has an output shaft that drives the transmission. The transmission has a plurality of planet gears, a planet carrier journally supporting the planet gears for rotation about an axis, and a ring gear that is in meshing engagement with the planet gears. The impact mechanism has a plurality of anvil lugs, an impactor and an impactor spring. The anvil lugs are coupled to the ring gear and are not engaged by the planet gears. The impactor is mounted to pivot about the spindle and has a plurality of hammer lugs. The impactor spring biases the impactor toward the ring gear to cause the hammer lugs to engage the anvil lugs. A power tool having an impact mechanism with an external adjusting member that can be moved to vary a trip torque of the impact mechanism is also provided.Type: GrantFiled: April 21, 2010Date of Patent: January 21, 2014Assignee: Black & Decker Inc.Inventors: Sankarshan Murthy, Qiang Zhang, Daniel Puzio, James T. Rill
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Patent number: 8607893Abstract: The cover is provided with engaging pieces that engage with a recessed groove provided on the outer peripheral surface of a hammer case and hold the cover on the hammer case to prevent the cover from being detached. The cover is also provided with bumper receiving portions extending from the front end of the cover and allowing the bumper to be externally attached to the cover, and engaging claws formed on the bumper receiving portions and engaging with engaged recessed portions formed on the inner peripheral surface of the bumper for holding the bumper to prevent the bumper from being detached from the cover. The cover with the bumper attached to the bumper receiving portions is provided to the hammer case.Type: GrantFiled: January 13, 2011Date of Patent: December 17, 2013Assignee: Makita CorporationInventors: Ryunosuke Kumagai, Hidenori Nagasaka, Manabu Sugimoto
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Publication number: 20130228354Abstract: An impact tool includes a housing, a motor having an output shaft defining a first axis, a drive shaft rotatably supported by the housing about a second axis oriented substantially normal to the first axis, and an impact mechanism coupled between the motor and the drive shaft and operable to impart a striking rotational force to the drive shaft. The impact mechanism includes an anvil rotatably supported by the housing and coupled to the drive shaft, and a hammer coupled to the motor to receive torque from the motor and impart the striking rotational force to the anvil. The impact tool also includes a ratcheting mechanism operable to prevent rotation of the anvil and the drive shaft in a selected direction relative to the housing.Type: ApplicationFiled: March 1, 2013Publication date: September 5, 2013Applicant: MILWAUKEE ELECTRIC TOOL CORPORATIONInventor: Terry Timmons
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Patent number: 8505648Abstract: A drive assembly for an impact wrench includes a tool element for working on a workpiece. The drive assembly also includes a ram rotatable about a central axis. The ram includes a ram lug spaced from the central axis. The ram lug has at least one drive surface. The drive assembly further includes an anvil having an anvil lug with at least one driven surface engageable with the drive surface of the ram lug to drive the anvil. The anvil is connectable to the tool element to rotatably drive the tool element. At least one of the drive surface and the driven surface includes an involute profile.Type: GrantFiled: May 7, 2009Date of Patent: August 13, 2013Assignee: Milwaukee Electric Tool CorporationInventor: William A. Elger
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Patent number: 8490714Abstract: An impact wrench is provided that can mitigate vibrations in the axial direction without reducing the rotary impact force of hammers. The hammers are composed of a primary hammer fitted to the outer circumference of a spindle and a cylindrical secondary hammer that is disposed so as to cover the primary hammer and that rotates integrally with the primary hammer. Furthermore, the secondary hammer is held by a center holding means in a state in which the rotational axis of the secondary hammer is coincident with the axis of the spindle in order to prevent run-out movement. With the use of the hammer configuration of the present invention, the mass of the primary hammer can be decreased compared to that of the secondary hammer, and therefore it is possible to mitigate vibrations in the axial direction while maintaining the rotary impact force.Type: GrantFiled: November 16, 2011Date of Patent: July 23, 2013Assignee: Kuken Co., Ltd.Inventor: Akinori Nakamura
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Publication number: 20130133911Abstract: There is provided a rotary impact tool that includes: a motor; a hammer configured to be rotated by the motor; an anvil configured to be intermittently applied with an impact force in a rotation direction by a rotational force of the hammer; a rotation speed detection device configured to detect a rotation speed of the motor; an extreme value pair detection device configured to detect an extreme value pair, which is a pair of a maximum value and a minimum value of the rotation speed, based on the rotation speed detected by the rotation speed detection device; and an impact detection device configured to detect that the impact force is being applied when an extreme value difference, which is a difference between the maximum value and the minimum value, is equal to or more than a first threshold value.Type: ApplicationFiled: November 26, 2012Publication date: May 30, 2013Inventors: Goshi ISHIKAWA, Yoshitaka ICHIKAWA
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Publication number: 20130112448Abstract: A hand-held power tool, in particular in the form of a hammer drill or an impact screwdriver, is disclosed. The tool has a tool receptacle attached to an output shaft for receiving a tool, where the output shaft may be set into a rotating and partially percussive motion by a drive shaft and a tangential striking mechanism. The tangential striking mechanism has an anvil allocated to the output shaft and a hammer allocated to the drive shaft. The hammer can be moved axially under the application of the force of a spring and a sliding block guide, and can be struck against the anvil with the rotation of the same. The sliding block guide has a helical control contour which has a first slope in a first section and a second slope in a second section, where the first and second slopes are different.Type: ApplicationFiled: April 27, 2012Publication date: May 9, 2013Applicant: Hilti AktiengesellschaftInventors: Dieter PROFUNSER, Laurent Wahl
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Patent number: 8371394Abstract: An impact mechanism comprises a drive engaging member and a tool bit retaining member. A hammer is mounted on the drive engaging member for guided movement between an anvil contact position whereat force is transmitted from the hammer to the anvil portion so as to create a moment about the longitudinal axis, and a release position whereat the hammer is temporarily removed from the anvil portion. A spring biases the hammer to the anvil contact position. A main body member has an internal thread and is threadably engaged on a co-operating external thread on the drive engaging member. The spring is operatively interconnected between the main body member and the hammer member, to thereby permit selective compression of the spring through rotation of the manually manipulable handle.Type: GrantFiled: April 22, 2009Date of Patent: February 12, 2013Inventor: Gerard Grand
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Patent number: 8360098Abstract: A monodirectional intake pressure stabilization structure of pneumatic tool includes a tool main body and a pressure stabilization unit. The pressure stabilization unit is disposed in a first directional intake passage formed in the tool main body for controlling the pressure of the air guided by the first directional intake passage into an air chamber of the tool main body. Accordingly, excessively great intake pressure can be avoided so as to avoid over-torque output of the pneumatic tool. In this case, the pneumatic tool can stably output power within a safety range in accordance with the requirements of actual use. The pressure stabilization unit can be a pressure stabilizer or a pressure relief valve.Type: GrantFiled: April 6, 2010Date of Patent: January 29, 2013Inventors: Chia-Chiung Chuang, Fu-Yang Chuang
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Patent number: 8360166Abstract: According to an aspect of the present invention, there is provided a rotary striking tool, including: a motor; an impact unit having a driving part being driven by the motor and an output part; a tip-tool side output shaft that is coupled to the output part; an impact detection unit that detects an impact generated at the impact unit; and a control unit programmed to: control the impact unit to perform a confirmation striking when the impact detected by the impact detection unit reaches a prescribed value, detect a rotation angle of the output shaft at the confirmation striking, determine whether a fastening operation is completed when the detected rotation angle is equal to or smaller than a predetermined angle, and continue the fastening operation when the detected rotation angle is larger than the predetermined angle.Type: GrantFiled: September 8, 2010Date of Patent: January 29, 2013Assignee: Hitachi Koki Co., Ltd.Inventors: Yoshio Iimura, Kenro Ishimaru, Kazutaka Iwata, Nobuhiro Takano
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Patent number: 8322457Abstract: A power tool includes a housing, a motor supported in the housing, a chuck assembly having a chuck body rotatable about a central axis in response to torque received from the motor, and a plurality of jaws supported in the chuck body. Each of the jaws includes a front portion operable to grasp a tool element and a rear portion positioned outside the chuck body. The power tool also includes a hammer mechanism operable to impart movement to the chuck assembly, in a direction parallel to the central axis, during rotation of the chuck assembly about the central axis.Type: GrantFiled: February 5, 2010Date of Patent: December 4, 2012Assignee: Techtronic Power Tools Technology LimitedInventors: Kwok Ting Mok, Xian Guo Zhao, Zhi Liu Gu
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Publication number: 20120285713Abstract: A hammer cage, adapted for use in an impact tool that has a pin and a hammer swingable on the pin, includes: first and second walls, and first and second connecting walls independently interconnecting the first and second walls and cooperating with the first and second walls to define an impact space for receiving the hammer; and a first restricting structure having a pin hole member that extends through the first wall and that is adapted for extension of the pin, and a first restricting protrusion that protrudes from the second connecting wall toward the first connecting wall and that is adapted for restricting swing motion of the hammer on the first pin in the impact space.Type: ApplicationFiled: April 30, 2012Publication date: November 15, 2012Inventor: Jerry LIN
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Publication number: 20120279736Abstract: According to an aspect of the present invention, there is provided an impact tool including: a motor drivable in an intermittent driving mode; a hammer connected to the motor; an anvil to be struck by the hammer to thereby rotate/strike a tip tool; and a control unit that controls a rotation of the motor by switching a driving pulse supplied to the motor in accordance with a load applied onto the tip tool.Type: ApplicationFiled: July 29, 2010Publication date: November 8, 2012Applicant: HITACHI KOKI CO., LTD.Inventors: Hideyuki Tanimoto, Nobuhiro Takano, Tomomasa Nishikawa, Kazutaka Iwata, Hironori Mashiko, Hayato Yamaguchi, Atsushi Nakagawa, Katsuhiro Oomori, Mizuho Nakamura, Hiroki Uchida, Saroma Nakano, Yutaka Ito
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Publication number: 20120234566Abstract: An impact tool including: a motor including, a rotor, a stator, and a detecting device that detects a rotation position of the rotor; a hammer driven by the motor so as to be rotated; an anvil configured to rotate relatively to the hammer and is struck by the hammer; and an output shaft connected to the anvil; wherein the anvil is struck by the hammer by rotating the hammer in a forward rotation direction by a second predetermined amount after rotating the hammer in a reverse rotation direction by a first predetermined amount, and wherein the first predetermined amount and the second predetermined amount are controlled based on a rotation angle that is obtained based on an output of the detecting device.Type: ApplicationFiled: November 30, 2011Publication date: September 20, 2012Applicant: HITACHI KOKI CO., LTD.,Inventors: Hironori MASHIKO, Tomomasa NISHIKAWA, Nobuhiro TAKANO