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EP2130651B1 - Impact tool - Google Patents

Impact tool Download PDF

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Publication number
EP2130651B1
EP2130651B1 EP08711844.4A EP08711844A EP2130651B1 EP 2130651 B1 EP2130651 B1 EP 2130651B1 EP 08711844 A EP08711844 A EP 08711844A EP 2130651 B1 EP2130651 B1 EP 2130651B1
Authority
EP
European Patent Office
Prior art keywords
shaft
gear
output shaft
reduction shaft
impact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP08711844.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2130651A4 (en
EP2130651A1 (en
Inventor
Yonosuke Aoki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Makita Corp
Original Assignee
Makita Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2007079709A external-priority patent/JP4965303B2/ja
Priority claimed from JP2007079708A external-priority patent/JP5026834B2/ja
Application filed by Makita Corp filed Critical Makita Corp
Publication of EP2130651A1 publication Critical patent/EP2130651A1/en
Publication of EP2130651A4 publication Critical patent/EP2130651A4/en
Application granted granted Critical
Publication of EP2130651B1 publication Critical patent/EP2130651B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D16/006—Mode changers; Mechanisms connected thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D16/003—Clutches specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/24—Damping the reaction force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/26—Lubricating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/003—Crossed drill and motor spindles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0015—Tools having a percussion-only mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0023—Tools having a percussion-and-rotation mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/165—Overload clutches, torque limiters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/185—Pressure equalising means between sealed chambers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/245—Spatial arrangement of components of the tool relative to each other

Definitions

  • This invention relates to an impact tool as disclosed in the preamble of claim 1, such as an electric hammer, a hammer drill, and the like.
  • Such an impact tool is known from JP 53-155501 U .
  • Patent Document 1 discloses one known type such that within a housing, a tool holder having a bit-installable front end is rotatably supported, a motor is disposed with an output shaft thereof oriented in a direction perpendicular to an axis of the tool holder, and an impact mechanism is provided which comprises a piston configured to make a reciprocating motion by means of a crank mechanism actuated according to a rotation of the output shaft and an impactor configured to move in synchronization with the piston by the action of an air spring.
  • a shaft (reduction shaft) provided with a torque limiter which enables transmission of a rotatory motion of the motor to the tool holder within a predetermined torque is rotatably supported in a position parallel to the output shaft between the tool holder and the motor, and a switch mechanism configured to permit selection of ON and OFF of the transmission of the rotatory motion from the output shaft is provided to this shaft.
  • the piston upon activation of the motor, the piston is caused to reciprocate by means of the crank mechanism, and the impactor synchronized with the piston strikes a bit indirectly through an interjacent element such as an impact bolt.
  • the rotatory motion of the motor is transmitted to the tool holder through the shaft, and thus the rotatory motion, as well, is imparted to the bit so that the tool can be used in a hammer drill mode.
  • the switch mechanism is actuated to interrupt the transmission of the rotatory motion to the shaft, a striking motion only is imparted to the bit so that the tool can be used in a hammer mode.
  • Patent Document 2 proposes that an air chamber connected only with the outside of the impact unit and having a volume rendered variable by a diaphragm be formed in the inner housing so that reduction in volume of the air chamber can abate the increase in pressure inside the impact unit.
  • Patent Document 3 discloses an arrangement in which a casing comprising a pressure equilibrating chamber in communication with the inside of the impact unit and a pressure equilibrating tube in communication with the ambient atmosphere while blocking the oil from flowing out is mounted to a sealed impact unit so that a differential pressure between the inside and the outside of the impact unit is cancelled by using the pressure equilibrating chamber.
  • the above-described conventional hammer drill has the motor, the crank mechanism and the shaft which are disposed in a rear-side space of the housing, and thus its barycenter is located off-center to a rear side thereof.
  • an impact tool according to claim 1 is provided.
  • the reduction shaft is disposed frontward of the intermediate reduction shaft, and the motor is positioned closer to the axis of the tool holder, so that the impact tool has its barycenter shifted frontward and upward and thus attains an improved weight balance as a whole.
  • the moment to be produced in the impact tool around a front end of the bit during a drilling or other operation will become small, and vibration entailed during a striking operation thereof is reduced thereby achieving improved operability and workability.
  • the motor since the motor is in a position shifted closer to the axis of the tool holder, the tool may be rendered compact in its height direction.
  • the intermediate reduction shaft optionally comprises a switch mechanism configured to permit selection of ON and OFF of transmission of the rotatory motion to the reduction shaft
  • the switching operation can be performed easily at the switch mechanism as the switch mechanism is provided at the intermediate reduction shaft of which the torque applied thereto is smaller.
  • the reduction shaft optionally comprises a torque limiter
  • the switching operation can be performed prior to the application of impact (load) by the striking operation as the intermediate reduction shaft is located upstream of the reduction shaft, so that a good operability can be maintained.
  • a hammer drill 1 comprises an outer housing 2 and components housed therein which includes a rotation and impact unit 3 disposed in an upper space thereof and a motor 8 disposed rearward of the rotation and impact unit 3 in a lower space thereof, wherein the rotation and impact unit 3 has a tool holder 7 protruding frontward (leftward in the drawing), and the motor 8 has an output shaft 9 thereof oriented upward.
  • the rotation and impact unit 3 is enclosed in, and defined by, an inner housing inside the outer housing 2, wherein the inner housing comprises a holder housing 4 in which the tool holder 7 is rotatably supported, a crank housing 5 which is disposed rearward of and coupled to the holder housing 4, and a gear housing 6 which is disposed below and coupled to the crank housing 5.
  • the output shaft 9 of the motor 8 is rotatably supported by ball bearings 10 held at the bottom of the gear housing 6 and is inserted in the rotation and impact unit 3.
  • Denoted by reference numerals 11 and 12 are seal rings which seal a protruded portion of the tool holder 7 and an inserted portion of the output shaft 9, respectively.
  • a tubular proximity portion 14 is formed which has a through hole 13 extending laterally and tunneling through the rotation and impact unit 3 and of which an underside facing to an inside of the rotation and impact unit 3 is proximate to an end face of the output shaft 9.
  • a vent hole 15 coaxial with the output shaft 9 is formed so that the through hole 13 connecting to an outside of the rotation and impact unit 3 is in communication with an inside of the rotation and impact unit 3.
  • a protrusion 16 having a shape of a circular cone tapering toward the end face of the output shaft 9 is provided coaxially with the vent hole 15.
  • a recess 17 having a circular shape with an inverted tapered surface 18 provided at an open side thereof, contoured to fit the shape of the tapering of the protrusion 16 is provided. In this way, a labyrinth seal 19 is formed from around the output shaft 9 to the vent hole 15 in the rotation and impact unit 3.
  • the tool holder 7 has a front end configured to be able to hold a bit 20 fitted and installed therein, and incorporates an impact bolt 21 as an interjacent element which is disposed rearward of the bit 20 and configured to be movable frontward and rearward in a predetermined stroke.
  • Denoted by reference numeral 22 is a bevel gear coupled to a rear end of the tool holder 7.
  • a cylinder 23 held by the crank housing 5 is loosely inserted from rearward; inside the cylinder 23, a striker 24 as an impactor disposed frontward and a piston 26 disposed rearward of the striker 24 with an air chamber 25 interposed therebetween are housed, in a manner that renders them movable frontward and rearward, respectively.
  • the piston 26 is connected via a connecting rod 27 to an eccentric pin 29 provided protrusively on an upper surface of the crank shaft 28.
  • the crank shaft 28 is disposed rearward of the output shaft 9 and rotatably supported by the crank housing 5 and the gear housing 6 in a position parallel to the output shaft 9.
  • a gear 30 provided at a lower portion of the crank shaft 28 is in mesh with the output shaft 9.
  • An intermediate reduction shaft 31 is disposed below the tool holder 7 and frontward of the output shaft 9, and is rotatably supported in a position parallel to the output shaft 9, whereas a reduction shaft 32 is disposed frontward of the intermediate reduction shaft 31, and rotatably supported in a position parallel to the intermediate reduction shaft 31.
  • a pinion of the output shaft 9 is in mesh with the first gear 35 provided on an upper portion of the intermediate reduction shaft 31, and the motor 8 is disposed in such a position that the output shaft 9 protrudes upward beyond the third gear 37 of the reduction shaft 32.
  • the motor 8 is positioned closer to the axis of the tool holder 7.
  • the first gear 35 is fitted on the intermediate reduction shaft 31, rotatably relative to the intermediate reduction shaft 31, and a switch plate 39 having engageable teeth 40, 40, .. provided protrusively on an underside thereof and configured to be engageable with engageable recesses 38, 38, .. provided on an upper surface of the first gear 35 is provided in a position above the first gear 35 on, and coupled with splines of, the intermediate reduction shaft 31 so that the switch plate 39 is movable in an axial direction and rotatable integrally with the intermediate reduction shaft 31.
  • the switch plate 39 is biased by a coil spring 41 toward a position in which the switch plate 39 engages with the first gear 35, and can be operated by manipulation of a switch member (not shown) provided at the outer housing 2 to slide to a position (right-hand position in FIG. 1 ) in which the switch plate 39 engages with the first gear 35 and to a position (left-hand position in FIG. 1 ) in which the switch plate 39 disengages from the first gear 35.
  • a switch mechanism configured to permit selection of ON and OFF of transmission of the rotatory motion to the reduction shaft 32 is implemented.
  • the reduction shaft 32 of which an upper end portion and a lower end portion are rotatably supported by ball bearings 42 held in the crank housing 3 and by ball bearings 43 held in the gear housing 6, respectively, and on which a bevel gear 44 is provided at an upper end thereof and meshed with the bevel gear 22 of the tool holder 7.
  • the third gear 37 is fitted on, and configured to be rotatable independently from, the reduction shaft 32, and divided into an upper plate 45 meshed with the second gear 36 of the intermediate reduction shaft 31 and a lower plate 46 configured to rotate integrally with the reduction shaft 32.
  • An engageable member 48 configured to be biased toward a radial direction of protrusion thereof by a coil spring 47 is provided on the lower plate 46, and engages with an engageable portion 49 provided on an inner side surface of the upper plate 45.
  • a torque limiter is configured to transmit a rotatory motion of the second gear 36 to the reduction shaft 32 when the torque is not greater than such a magnitude that the engageable member 48 can be kept in engagement with the engageable portion 49 by the pressing force of the coil spring 47, and to cause the engageable member 48 to move away from the engageable portion 49 against the pressing force of the coil spring 47 to cause the upper plate 45 alone to rotate at idle, thereby interrupting transmission of torque from the second gear 36 toward the reduction shaft 32, when a torque exceeding the magnitude as mentioned above is produced at a tool holder 7 side.
  • the hammer drill 1 configured as described above, with a bit 20 installed and held in the tool holder 7, when a switch lever (not shown) provided at the outer housing 2 is manipulated to activate the motor 8, the rotatory motion of the output shaft 9 is transmitted to the crank shaft 28, and the rotatory motion of the crank shaft 28 is converted to the reciprocating motion of the piston 26 actuated via the connecting rod 27.
  • the striker 24 is moved via the air chamber 25 in synchronization with the reciprocating motion of the piston 26, and strikes the rear end of the impact bolt 21 that has been pushed by the rear end of the bit 20 and protruded into the cylinder 23. In this way, the striking motion by the striker 24 is imparted indirectly to the bit 20.
  • the rotatory motion of the output shaft 9 is, first, transmitted to the first gear 35.
  • the switch plate 39 has been operated to switch to the position in which it engages with the first gear 35, then the first gear 35 and the intermediate reduction shaft 31 integrally rotate together, and thus the rotatory motion of the intermediate reduction shaft 31 is transmitted from the second gear 36 through the third gear 37 to the reduction shaft 32.
  • the tool holder 7 to which the rotatory motion is transmitted from the bevel gear 44 of the reduction shaft 32 rotates, so that the bit 20 operates in a hammer drill mode in which a rotatory motion as well as a striking motion is made.
  • the switch plate 39 has been operated to the position in which it disengages from the first gear 35, then the rotatory motion of the first gear 35 is not transmitted to the intermediate reduction shaft 31. Accordingly, the tool holder 7 fails to make a rotatory motion, so that the bit 20 operates in the hammer mode in which the striking motion only is imparted thereto.
  • the reduction shaft 32 is located in a position shifted significantly frontward in comparison with the position of a reduction shaft in a tool designed under the conventional scheme.
  • the output shaft 9 can be configured to mesh with the first gear 35 located on an upper portion of the intermediate reduction shaft 31, unlike a conventional arrangement in which the output shaft is configured to mesh with the third gear 37 located on a lower portion of the reduction gear 32, and thus the position of the motor 8 is shifted upward closer to the axis of the tool holder 7.
  • the intermediate reduction shaft 31 configured to reduce the rotation speed of the output shaft 9 and transmit the speed-reduced rotatory motion to the reduction shaft 32 is disposed in a position parallel to the output shaft 9, frontward of the output shaft 9 between the reduction shaft 32 and the output shaft 9, so that the reduction shaft 32 is disposed frontward of the intermediate reduction shaft 31, while the motor 8 is disposed in a position such that the output shaft 9 protrudes upward beyond the third gear 37 of the reduction shaft 32 so that the motor 8 is positioned closer to the axis of the tool holder 7. Therefore, the hammer drill 1 has its barycenter shifted frontward and upward and thus attains an improved weight balance as a whole.
  • the moment to be produced in the hammer drill 1 around the front end of the bit 20 during the drilling or other operation will become small, and vibration entailed during the striking operation is reduced whereby improved operability and workability can be achieved. Furthermore, since the motor 8 is in a position shifted closer to the axis of the tool holder 7, the hammer drill 1 may be rendered compact in its height direction.
  • the intermediate reduction shaft 31 includes a switch mechanism configured to permit selection of ON and OFF of transmission of the rotatory motion to the reduction shaft 32, the switching operation can be performed easily at the switch mechanism in that the switch mechanism is provided at the intermediate reduction shaft 31 of which the torque applied thereto is smaller.
  • the intermediate reduction shaft 31 is located upstream of the reduction shaft 32 that includes the torque limiter, and thus, the switching operation can be performed prior to the application of impact (load) by the striking operation, so that a good operability can be maintained.
  • the proximity portion 14 having an inner surface proximate to an end face of the output shaft 9 provided in the rotation and impact unit 3 is formed in the crank housing 5, and the vent hole 15 affording communication between the inside of the rotation and impact unit 3 and the outside of the rotation and impact unit 3 is formed in a surface of the proximity portion 14 opposed to the end face of the output shaft 9.
  • air inside the rotation and impact unit 3 can be released reliably without causing oil leakage through the vent hole 15, and therefore adequate lubrication can be maintained.
  • separation of air and oil is achieved by means of the output shaft 9, which provides a reasonable design utilizing the existing configurations; therefore, a fabrication step for providing means for releasing air can be minimized so that increase in cost and required space can be minimized, too.
  • the rotation shaft is the output shaft 9 of the motor 8
  • the output shaft 9 that rotates at the highest speeds can be utilized to more effectively prevent the oil leakage.
  • the protrusion 16 located coaxially with the vent hole 15 is formed at the surface of the proximity portion in which the vent hole 15 is formed, and the recess 17 in which the protrusion 16 is inserted in a noncontact manner is formed at the end face of the output shaft 9, and thus the labyrinth seal 19 formed with the protrusion 16 and the recess 17 may serve to more effectively prevent the oil leakage.
  • the switch mechanism comprising a switch plate and other components is used, but the switch mechanism is not limited to this configuration.
  • a slide key configured to engage with and disengage from the first gear may be provided in the intermediate reduction shaft, or the first gear may be slid in the axial direction to engage with and disengage from spline teeth or keys at the side of the intermediate reduction shaft; likewise, the specific configurations may be modified where appropriate.
  • the switch mechanism may alternatively be provided in the reduction shaft, and the switch mechanism may be omitted.
  • the torque limiter is provided in the reduction shaft in the above-described embodiment, but the configurations of the torque limiter may be designed differently where appropriate, and the torque limiter may be omitted.
  • the types of bearings for each reduction shaft, configurations of the gears, etc. may be changed where appropriate.
  • the arrangement of the intermediate reduction shaft, the reduction shaft and the output shaft may not be limited to such that they are aligned in a straight line extending in the front-rear direction.
  • the tubular proximity portion having a through hole tunneling through the rotation and impact unit is formed, but the configuration thereof is not limited to this tunneling configuration, and may be a hole which has a bottom and extends to the end face of the rotation shaft such as the output shaft.
  • the recess may be formed, other than by the receding of a surface, by providing an annular ridge rising from a surface to make a space in which the protrusion can loosely be inserted.
  • the labyrinth seal may be formed by providing two such annular ridges which are coaxially provided in a manner that permits them to be loosely fitted together. Rather, it is to be understood that the oil leakage can be prevented without the protrusion and the recess by simply arranging the end face of the rotation shaft in a position close to the vent hole.
  • the output shaft is adopted as the rotation shaft, but the present invention may be applied to an end face of any other rotation shaft such as the intermediate reduction shaft, the reduction shaft and the crank shaft, as long as the proximity portion and the vent hole can be formed. Accordingly, the proximity portion may be formed in any housing other than the crank housing provided that it is an inner housing defining the impact unit.
  • the present invention may be applicable not only to a hammer drill but also to a hammer in which a striking motion only is imparted to the bit by the crank mechanism.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
EP08711844.4A 2007-03-26 2008-02-22 Impact tool Active EP2130651B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2007079709A JP4965303B2 (ja) 2007-03-26 2007-03-26 打撃工具
JP2007079708A JP5026834B2 (ja) 2007-03-26 2007-03-26 ハンマードリル
PCT/JP2008/053076 WO2008126480A1 (ja) 2007-03-26 2008-02-22 打撃工具

Publications (3)

Publication Number Publication Date
EP2130651A1 EP2130651A1 (en) 2009-12-09
EP2130651A4 EP2130651A4 (en) 2011-08-31
EP2130651B1 true EP2130651B1 (en) 2014-11-26

Family

ID=39863636

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08711844.4A Active EP2130651B1 (en) 2007-03-26 2008-02-22 Impact tool

Country Status (3)

Country Link
EP (1) EP2130651B1 (ja)
RU (1) RU2477212C2 (ja)
WO (1) WO2008126480A1 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009027442A1 (de) * 2009-07-03 2011-01-05 Robert Bosch Gmbh Handwerkzeugmaschine
RU2012140965A (ru) * 2011-10-04 2014-03-27 Макита Корпорейшн Электроинструмент (варианты)
EP2871028A1 (de) 2013-11-11 2015-05-13 HILTI Aktiengesellschaft Handwerkzeugmaschine

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1097755B (de) * 1958-05-17 1961-01-19 Daimler Benz Ag Vorrichtung zur Entlueftung von Brennkraftmaschinen
JPS53155501U (ja) * 1977-05-11 1978-12-06
SU1038476A2 (ru) * 1980-06-23 1983-08-30 Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Механизированного И Ручного Строительно-Монтажного Инструмента Вибраторов И Строительно-Отделочных Машин Машина ударно-вращательного действи
DE3320426C3 (de) 1983-06-06 1998-03-26 Hilti Ag Belüftung für den Gehäuseraum eines Bohr- oder Meisselgerätes
DE4231987A1 (de) * 1992-09-24 1994-03-31 Bosch Gmbh Robert Handwerkzeugmaschine, insbesondere Bohrhammer
JP3292969B2 (ja) * 1995-08-18 2002-06-17 株式会社マキタ ハンマードリル
JP3447857B2 (ja) * 1995-08-18 2003-09-16 株式会社マキタ 電動工具のトルク伝達機構
DE10029728A1 (de) * 2000-06-16 2001-12-20 Hilti Ag Handwerkzeuggerät
GB2410212B (en) * 2001-09-17 2006-02-08 Milwaukee Electric Tool Corp Rotary hammer
JP2004351595A (ja) 2003-05-30 2004-12-16 Hitachi Koki Co Ltd 動力工具
JP4515181B2 (ja) * 2004-07-20 2010-07-28 株式会社マキタ 電動ハンマドリル
JP4405378B2 (ja) * 2004-12-24 2010-01-27 株式会社マキタ 電動工具
EP1728596B1 (en) * 2005-06-02 2009-02-11 Makita Corporation Power tool

Also Published As

Publication number Publication date
RU2009139226A (ru) 2011-05-10
EP2130651A4 (en) 2011-08-31
RU2477212C2 (ru) 2013-03-10
EP2130651A1 (en) 2009-12-09
WO2008126480A1 (ja) 2008-10-23

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