EP1950008A1 - Marteau perforateur - Google Patents

Marteau perforateur Download PDF

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Publication number
EP1950008A1
EP1950008A1 EP06823361A EP06823361A EP1950008A1 EP 1950008 A1 EP1950008 A1 EP 1950008A1 EP 06823361 A EP06823361 A EP 06823361A EP 06823361 A EP06823361 A EP 06823361A EP 1950008 A1 EP1950008 A1 EP 1950008A1
Authority
EP
European Patent Office
Prior art keywords
clutch
sleeve
intermediate shaft
tool holding
motion
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.)
Withdrawn
Application number
EP06823361A
Other languages
German (de)
English (en)
Other versions
EP1950008A4 (fr
Inventor
Akira Max CO. Ltd TERANISHI
Kazuya Max CO. Ltd SAKAMAKI
Terufumi Max CO. Ltd HAMANO
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.)
Max Co Ltd
Original Assignee
Max Co Ltd
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
Application filed by Max Co Ltd filed Critical Max Co Ltd
Publication of EP1950008A1 publication Critical patent/EP1950008A1/fr
Publication of EP1950008A4 publication Critical patent/EP1950008A4/fr
Withdrawn legal-status Critical Current

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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
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/062—Means for driving the impulse member comprising a wobbling mechanism, swash plate
    • 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
    • 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
    • B25D2216/0038—Tools having a rotation-only mode

Definitions

  • the present invention relates to a hammer drill in which motion mode can be switched between a hammering mode, a rotation mode, and a rotary hammering mode.
  • a hammer drill can transmit impact and rotation from a motor to a tool provided at its tip end by way of a hammering mechanism and a rotary driving mechanism, at the same time, or independently from each other, by operating an operating lever to rotate and selecting either of a hammering mode, a rotation mode and a rotary hammering mode.
  • the motion mode switching mechanism is so constructed that the hammering mechanism and the rotary driving mechanism are respectively provided with clutches, thereby to connect or disconnect the rotating force from the motor to the hammering mechanism or the rotary driving mechanism.
  • the mode switching mechanism which is so constructed that an intermediate shaft operatively coupled to the motor and a tool holding sleeve for holding the tip end tool are disposed in a housing in parallel with each other, and the tool holding sleeve can be operatively coupled to the hammering mechanism and the rotary driving mechanism by way of the intermediate shaft
  • the intermediate shaft is provided with two clutches, one of which transmits or interrupts a torque of the intermediate shaft to the hammering mechanism, and the other clutch transmits the torque to the rotary driving mechanism.
  • the second clutch moves in an axial direction of the intermediate shaft thereby to be engaged with and disengaged from the driving gear which is provided on the tool holding sleeve.
  • the second clutch moves in a direction separating from the driving gear along the intermediate shaft against an urge of a spring, and in the rotation mode, the second clutch returns to be engaged with the driving gear. Therefore, when the motion mode is switched from the pure hammering mode to the rotation mode, the gear of the second clutch which has been disengaged is moved by the urge of the spring to be reengaged with the driving gear. Accordingly, there is such anxiety that in case where the driving gear rotates, the gear may be damaged, because reengagement with the driving gear becomes difficult, or a sudden transmitting force by the reengagement is exerted on the driving gear.
  • One or more embodiments of the invention provide a hammer drill which can ensure smooth operation, with no problem of engagement between gears, even in case where motion mode is switched from a pure hammering mode to a rotation mode.
  • an intermediate shaft operatively coupled to a motor and a tool holding sleeve for holding a tip end tool are disposed in a housing in parallel with each other, a motion converting member for converting rotary motion to reciprocating motion thereby to operate the tip end tool to hammer is rotatably provided on the intermediate shaft, a first clutch is provided between the intermediate shaft and the motion converting member, a clutch sleeve coupled to the intermediate shaft by way of a rotation transmitting member and a second clutch which rotates integrally with the tool holding sleeve and can move in a longitudinal direction of the tool holding sleeve are arranged on an outer periphery of the tool holding sleeve, and the second clutch is provided so as to be engaged with and disengaged from the clutch sleeve.
  • the intermediate shaft and the tool holding sleeve are arranged in parallel, and operatively connected to each other by means of gears.
  • the first clutch is provided at a side of the intermediate shaft, while the second clutch is provided at a side of the tool holding sleeve, and the rotation transmitting member and the clutch sleeve are interposed between the intermediate shaft and the second clutch. Therefore, rotation of the intermediate shaft is always transmitted to the clutch sleeve, and no problem of engagement occurs in this region.
  • the second clutch can rotate integrally with the tool holding sleeve, and can move along the longitudinal direction of the tool holding sleeve, the second clutch and the tool holding sleeve always rotate together in the engaged state, and no problem of engagement occurs.
  • the housing may be provided with a lock member capable of being engaged with the second clutch which has been disengaged from the clutch sleeve, and it is possible to urge this lock member so as to be engaged with the second clutch.
  • Fig. 1 is a longitudinal sectional view of an essential part of a hammer drill.
  • numeral 1 represents a housing.
  • a motor (not shown) is contained in rear of the housing 1 (at a right side in Fig. 1 ).
  • An output shaft 2 of the motor is pivotally held by an inner housing 1a which is assembled to an inside of the housing 1, and meshed with a reduction gear 4 of an intermediate shaft 3 which is pivotally held in parallel with the output shaft 2.
  • a motion converting member 5 having a spherical face is rotatably mounted on the intermediate shaft 3.
  • a spline 7b provided on the motion converting member 5 and a spline 8 of a first clutch 6 are arranged so as to rotate and so as to move in an axial direction.
  • the first clutch 6 is urged to move forward by a clutch spring 9 so as to be engaged with a spline 7a of the intermediate shaft 3.
  • a first gear 10 is provided on a front end of the intermediate shaft 3.
  • a tool holding sleeve 11 is rotatably provided in the housing 1 in parallel with the intermediate shaft 3.
  • a piston 12 in a bottomed cylindrical shape is slidably contained in the tool holding sleeve 11.
  • a backward end of the piston 12 is coupled to the motion converting member 5 outside the intermediate shaft 3 by way of a swing shaft 16 which is provided with a reciprocating bearing 15.
  • a ball 19 is engaged between a groove 17 formed on an inner periphery of the reciprocating bearing 15 and a groove 18 which is diagonally formed in the motion converting member 5. Accordingly, when the motion converting member 5 rotates, this rotation is converted to back and forth swing motions of the swing shaft 16.
  • a first hammer 20 is slidably disposed inside the piston 12, and a second hammer 21 is disposed in front of the first hammer 20. Further, a tip end tool 22 such as a drill bit is provided in front of the second hammer 21. The second hammer 21 and the tip end tool 22 are fitted in a small diameter part 11a of the tool holding sleeve 11 so as to slide in a certain range. A ball 24 projected from a through hole 29 in the small diameter part is engaged with a key groove 23 which is formed in a base part of the tip end tool 22. Accordingly, the tip end tool 22 rotates integrally with the tool holding sleeve 11, and at the same time, can move back and forth along a longitudinal direction of the tool holding sleeve 11.
  • a clutch sleeve 25, a second gear 26 (a rotation transmitting member 26), and a second clutch 27 are provided outside the tool holding sleeve 11.
  • the clutch sleeve 25 which has a large diameter part 30 formed at its back end by way of a flange 28 is rotatably provided around the tool holding sleeve 11. As shown in Fig. 4 , engaging claws 31 are formed on an inner face of the large diameter part 30.
  • the second gear 26 is always meshed with the first gear 10 of the intermediate shaft 3, and rotatably provided on an outer periphery of the clutch sleeve 25.
  • the second gear 26 and the flange 28 are respectively provided with slanted convex parts 32 and slanted concave parts 33 which are opposed to each other, as shown in Figs. 5A and 5B , and urged by a clutch spring 34 so as to be meshed with each other.
  • Rotation of the second gear 26 is transmitted to the clutch sleeve 25.
  • the engaging claws 31 of the clutch sleeve 25 are so adapted as to be meshed with the teeth of the second clutch 27.
  • the second clutch 27 has front teeth 36 and rear teeth 37 which are formed on an outer peripheral face thereof, interposing an engaging groove 35 in the middle.
  • the front teeth 36 are urged by a clutch spring 39 so as to be meshed with the engaging claws 31.
  • the second clutch 27 is provided with a key 40, while the tool holding sleeve 11 is provided with a key groove 41, and the second clutch 27 is coupled to the tool holding sleeve 11 by engagement between the key 40 and the key groove 41. Accordingly, the second clutch 27 rotates integrally with the tool holding sleeve 11, and at the same time, can slide along the longitudinal direction of the tool holding sleeve 11, whereby the second clutch 27 can be engaged with and disengaged from the clutch sleeve 25.
  • a lock bar 42 as a lock member is disposed in rear of the second clutch 27 inside the housing 1 so as to move back and forth in the same manner as the second clutch.
  • the lock bar 42 is urged by a spring 43 so as to move toward the second clutch 27.
  • the lock bar 42 is provided with teeth 44 at a front end thereof, in such a manner that when the second clutch 27 is disengaged from the clutch sleeve 25 and moved backward, the teeth 44 may be engaged with the rear teeth 37 of the second clutch 27.
  • FIG. 1 shows the hammer drill in the rotary hammering mode, in which the motion converting member 5 is coupled to the intermediate shaft 3 by the engagements between the splines 7a, 7b and 8, and the clutch sleeve 25 is coupled to the tool holding sleeve 11 by means of the second clutch 27.
  • the rotation force is transmitted from the output shaft 2 to the intermediate shaft 3 by way of the reduction gear 4.
  • Rotation torque of the intermediate shaft 3 is transmitted to the motion converting member 5 by way of the first clutch 6.
  • the swing shaft 16 swings, and the swing motion is converted to reciprocating motion of the piston 12.
  • the piston 12 reciprocates back and forth, air in a space S behind the first hammer 20 inside the piston 12 is compressed, whereby the first hammer 20 moves back and forth to strike the second hammer 21, and then, the second hammer 21 strikes the tip end tool 22. In this manner, a hammering force is transmitted to the tip end tool 22 which is pressed against an object such as a concrete block.
  • the rotation torque of the intermediate shaft 3 is also transmitted to the clutch sleeve 25 by way of the first gear 10 and the second gear 26.
  • the rotation of the clutch sleeve 25 is further transmitted to the tool holding sleeve 11 by way of the second clutch 27, whereby the tip end tool 22 is also rotated.
  • Fig. 2 shows the hammer drill in the rotation mode.
  • the spline 7a is disengaged from the spline 8, whereby transmission of the motion from the intermediate shaft 3 to the motion converting member 5 is interrupted, and hence, the motion converting member 5 is not operated.
  • the rotation torque of the intermediate shaft 3 is transmitted to the clutch sleeve 25 by way of the first gear 10 and the second gear 26, and then, transmitted from the clutch sleeve 25 to the tool holding sleeve 11 by way of the second clutch 27, whereby only the rotary motion of the tip end tool 22 is carried out.
  • Fig. 3 shows the hammer drill in the hammering mode.
  • the second clutch 27 retreats against the urge of the clutch spring 39 to be disengaged from the clutch sleeve 25, whereby transmission of the rotation from the clutch sleeve 25 to the tool holding sleeve 11 is interrupted, and hence, the tool holding sleeve 11 is not rotated.
  • the rotation torque of the intermediate shaft 3 is transmitted to the motion converting member 5 only, and only the hammering motion of the tip end tool 22 is carried out.
  • a body part 47a of a switch lever 47 is rotatably provided on the housing 1.
  • a lever part 48 is provided outside the body part 47a, and a first switch shaft 50 and a second switch shaft 51 are provided at offset positions inside the body part.
  • the first switch shaft 50 is so arranged as to be engaged with the first clutch 6.
  • the second switch shaft 51 is so arranged as to be engaged with the second clutch 27 by way of a shift plate 52. As shown in Figs.
  • the shift plate 52 is provided on an inner wall 53 of the housing 1 so as to move back and forth, and has a bent portion 54 at its front end and an actuating piece 55 in its middle part.
  • An end of the bent portion 54 is engaged with the engaging groove 35 in the middle of the second clutch 27, while the actuating piece 55 is so arranged as to be engaged with the second switch shaft 51. Accordingly, by rotating the switch lever 47, the second switch shaft 51 is engaged with the actuating piece 55 and pushed in, whereby the shift plate 52 is moved, and at the same time, the second clutch 27 which is engaged with the bent portion 54 is moved to the right and left.
  • numeral 47b represents a push button for restraining the switch lever 47 which has been set in a determined mode from arbitrarily rotating.
  • the first switch shaft 50 and the second switch shaft 51 are at respective positions as shown in Fig. 1 , wherein the motion converting member 5 is connected to the intermediate shaft 3 by means of the first clutch 6, and the tool holding sleeve 11 is connected to the clutch sleeve 25 by means of the second clutch 27.
  • the second switch shaft 51 moves the second clutch 27 backward against the urge of the clutch spring 39, as shown in Figs. 3 , 9, and 10 , whereby transmission of the power from the clutch sleeve 25 to the tool holding sleeve 11 is interrupted.
  • the motion converting member 5 is connected to the intermediate shaft 3.
  • the rear teeth 37 of the second clutch 27 are meshed with the teeth 44 of the lock bar 42, as shown in Fig. 6 .
  • the clutch sleeve 25 can move to the determined position. Because the lock bar 42 is always urged forward by the spring 43 so as to be engaged, and the tool holding sleeve 11 is rotated, even a little, by the clutch sleeve 25 due to friction force between them, the teeth 44 of the lock bar 42 are smoothly engaged with the second clutch 27. In this manner, the tool holding sleeve 11 is maintained in a state restrained from rotating, and thus, fine-tuning of the tool becomes possible.
  • the slanted convex parts 32 and the slanted concave parts 33 are formed in the flange 28 and the second gear 26 so as to be opposed to each other, as shown in Figs. 5A and 5B , and urged so as to be meshed with each other by the clutch spring 34 (See Fig. 1 ).
  • the clutch spring 34 See Fig. 1 .
  • the clutch sleeve 25 is also locked, and the second gear 26 is pushed forward against the clutch spring 34 to be disengaged from the clutch sleeve 25.
  • the second gear 26 idly rotates and acts as a safety mechanism which absorbs the rotation of the intermediate shaft 3. Therefore, waving of the tool body will not occur.
  • the invention can be applied to a hammer drill in which motion mode can be switched between a hammering mode, a rotation mode, and a rotary hammering mode.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
EP06823361A 2005-11-16 2006-11-13 Marteau perforateur Withdrawn EP1950008A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005331660A JP5055749B2 (ja) 2005-11-16 2005-11-16 ハンマドリル
PCT/JP2006/322587 WO2007058149A1 (fr) 2005-11-16 2006-11-13 Marteau perforateur

Publications (2)

Publication Number Publication Date
EP1950008A1 true EP1950008A1 (fr) 2008-07-30
EP1950008A4 EP1950008A4 (fr) 2010-11-24

Family

ID=38048535

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06823361A Withdrawn EP1950008A4 (fr) 2005-11-16 2006-11-13 Marteau perforateur

Country Status (7)

Country Link
US (1) US20090159304A1 (fr)
EP (1) EP1950008A4 (fr)
JP (1) JP5055749B2 (fr)
CN (1) CN101309780B (fr)
AU (1) AU2006313824A1 (fr)
CA (1) CA2629238A1 (fr)
WO (1) WO2007058149A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2364817A3 (fr) * 2010-03-09 2015-05-20 Robert Bosch GmbH Dispositif de marteau perforateur

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5058726B2 (ja) * 2007-09-06 2012-10-24 株式会社マキタ 打撃工具
DE102007050307A1 (de) * 2007-10-22 2009-04-23 Robert Bosch Gmbh Handwerkzeugmaschine
JP5116029B2 (ja) * 2008-03-05 2013-01-09 株式会社マキタ ハンマードリル
JP5376208B2 (ja) * 2009-01-20 2013-12-25 日立工機株式会社 電動穿孔工具
US8636081B2 (en) 2011-12-15 2014-01-28 Milwaukee Electric Tool Corporation Rotary hammer
DE102011085765A1 (de) * 2011-11-04 2013-05-08 Robert Bosch Gmbh Handwerkzeugmaschine mit einem über einen Handschalter betätigbaren Antriebsmotor
US9308636B2 (en) 2012-02-03 2016-04-12 Milwaukee Electric Tool Corporation Rotary hammer with vibration dampening
DE102012206445A1 (de) * 2012-04-19 2013-10-24 Hilti Aktiengesellschaft Werkzeugmaschine
US9630307B2 (en) 2012-08-22 2017-04-25 Milwaukee Electric Tool Corporation Rotary hammer
US10518399B2 (en) * 2015-09-30 2019-12-31 Chervon (Hk) Limited Clutch device and power tool with clutch device
JP6589992B2 (ja) * 2015-10-30 2019-10-16 工機ホールディングス株式会社 ハンマドリル
WO2020110539A1 (fr) * 2018-11-29 2020-06-04 工機ホールディングス株式会社 Engin d'impact

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0463416A1 (fr) * 1990-06-26 1992-01-02 Robert Bosch Gmbh Foreuse à percussion électrique
DE4205840A1 (de) * 1992-02-26 1993-09-02 Kress Elektrik Gmbh & Co Bohr- oder schlaghammer mit meisselfunktion
DE9307523U1 (de) * 1993-05-18 1994-09-29 Robert Bosch Gmbh, 70469 Stuttgart Elektrowerkzeug, insbesondere Schlagbohrmaschine oder Bohrhammer
US20050224242A1 (en) * 2004-04-08 2005-10-13 Rory Britz Hammer drill

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3506695A1 (de) * 1985-02-26 1986-08-28 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer
JPS62124883A (ja) * 1985-11-26 1987-06-06 芝浦メカトロニクス株式会社 ロ−タリ−ハンマ
DE4135240A1 (de) * 1991-10-25 1993-04-29 Bosch Gmbh Robert Bohrhammer
DE19545260A1 (de) * 1995-11-24 1997-05-28 Black & Decker Inc Bohrhammer
JP3450558B2 (ja) * 1995-12-25 2003-09-29 株式会社マキタ 電動工具
JP3098963B2 (ja) * 1996-02-09 2000-10-16 リョービ株式会社 回転工具の動作切り換え機構
JPH10175178A (ja) * 1996-12-13 1998-06-30 Hitachi Koki Co Ltd ハンマドリルの動作モード切換装置
JP3582760B2 (ja) * 1997-04-18 2004-10-27 日立工機株式会社 ハンマドリル
JP3683754B2 (ja) * 1999-10-05 2005-08-17 株式会社マキタ ハンマードリル
GB0008465D0 (en) * 2000-04-07 2000-05-24 Black & Decker Inc Rotary hammer mode change mechanism
JP3695392B2 (ja) * 2001-12-21 2005-09-14 日立工機株式会社 ハンマドリル
DE10312980B4 (de) * 2003-03-24 2018-05-03 Robert Bosch Gmbh Bohrhammer oder Schlagbohrmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0463416A1 (fr) * 1990-06-26 1992-01-02 Robert Bosch Gmbh Foreuse à percussion électrique
DE4205840A1 (de) * 1992-02-26 1993-09-02 Kress Elektrik Gmbh & Co Bohr- oder schlaghammer mit meisselfunktion
DE9307523U1 (de) * 1993-05-18 1994-09-29 Robert Bosch Gmbh, 70469 Stuttgart Elektrowerkzeug, insbesondere Schlagbohrmaschine oder Bohrhammer
US20050224242A1 (en) * 2004-04-08 2005-10-13 Rory Britz Hammer drill

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2007058149A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2364817A3 (fr) * 2010-03-09 2015-05-20 Robert Bosch GmbH Dispositif de marteau perforateur

Also Published As

Publication number Publication date
CA2629238A1 (fr) 2007-05-24
CN101309780A (zh) 2008-11-19
JP5055749B2 (ja) 2012-10-24
JP2007136586A (ja) 2007-06-07
AU2006313824A1 (en) 2007-05-24
EP1950008A4 (fr) 2010-11-24
CN101309780B (zh) 2010-09-01
WO2007058149A1 (fr) 2007-05-24
US20090159304A1 (en) 2009-06-25

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