EP1537955A2 - Hammer drill - Google Patents
Hammer drill Download PDFInfo
- Publication number
- EP1537955A2 EP1537955A2 EP20040257265 EP04257265A EP1537955A2 EP 1537955 A2 EP1537955 A2 EP 1537955A2 EP 20040257265 EP20040257265 EP 20040257265 EP 04257265 A EP04257265 A EP 04257265A EP 1537955 A2 EP1537955 A2 EP 1537955A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotary
- pinion
- control button
- slide
- hammer drill
- 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- Withdrawn
Links
Images
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
- 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, more particularly to a hammer drill which can perform three functions, namely drill, hammer and hammer/drill functions.
- the present invention relates to a three-function hammer drill whose control mechanism for shifting between different work modes is simple.
- a hammer drill comprising:
- control mechanism of the present invention for shifting between different work modes is simple and straightforwardly manufactured.
- the transmitting mechanism transmits linear drive from the linear drive mechanism to the aiguille (ie in a hammer action).
- the linear drive mechanism is a piston.
- the transmitting mechanism is a cylinder.
- the transmitting mechanism transmits rotary drive from the intermediate rotary shaft to the aiguille (ie in a drill action).
- the gear is movable along the axial direction of the transmitting mechanism.
- the guide device is fixed substantially longitudinally on the shell.
- the guide device is a linear guide device.
- the guide device is elongate.
- the slide device is adapted to linearly reciprocate rotary movement of the control button slidably along the guide device so as to selectively engage or disengage the gear and the third pinion or to selectively engage or disengage the teeth and the sleeve.
- control button further comprises:
- a first resilient member urges the sleeve and clutch into engagement.
- a second resilient member urges the gear and the third pinion into engagement.
- the clutch comprises teeth.
- the slide device defines an access hole through which the guide device passes as the slide device slides along the guide device.
- control button further comprises: a fastening device, wherein the shell comprises: a locking device for engaging the fastening device to lock the slide device relative to the guide device.
- the fastening device may be mounted substantially coaxially with the rotary control button.
- a third resilient member (eg spring) is disposed between the fastening device and the rotary control button, wherein the third resilient member urges the fastening device into engagement with the locking device.
- the locking device comprises at least three locking channels (eg on the shell) for selectively engaging the fastening device to lock the slide device relative to the guide device in at least three positions (ie the positions corresponding to the drilling mode, the hammer mode and the drilling and hammer mode respectively).
- Fig. 1 shows a hammer drill in accordance with an embodiment of the invention comprising a shell 10 and a motor 20 disposed in the shell 10.
- the motor 20 comprises an output rotary shaft 21 with a first pinion 22 thereon.
- An intermediate rotary shaft 30 is disposed parallel to the output rotary shaft 20 and comprises a second pinion 32 engaged with the first pinion 22 to transmit rotary power from the output rotary shaft 20 to the intermediate rotary shaft 30 and to a third pinion 31.
- a swing link comprises a bearing 40 having a sleeve 43 engaged with teeth 33 on the intermediate rotary shaft 30 and a connecting bar 41 connected to a piston 60.
- a first spring 42 is interposed between the bearing 40 and the intermediate rotary shaft 30 to urge the sleeve 43 and the teeth 33 into engagement so that the teeth 33 and the sleeve 43 perform a clutch function.
- a cylinder 50 covers the piston 60 and comprises a gear 51 engaged with the third pinion 31.
- the gear 51 can move along the axis of the cylinder 50.
- a second spring 52 is disposed on one side of the gear 51 to bring the gear 51 and the third pinion 31 into engagement so as to transmit rotary power from the intermediate rotary shaft 30 to the cylinder 50.
- the cylinder 50 is driven linearly by the piston 60.
- a collet 70 is mounted on one end of the cylinder 50 and an aiguille 80 is gripped in the collet 70.
- the hammer drill further comprises a control mechanism 100 which is shown in outline in Figures 2, 4 and 6, in cross-section in Figures 3, 5 and 7 and in situ in Figure 8.
- the control mechanism 100 itself comprises a rotary control button 110, a guide device 120 and a slide device 130.
- the rotary control button 110 has an eccentric shaft 111 parallel to its rotary axis.
- the slide device 130 defines a slide channel 131 which receives the eccentric shaft 111 and an access hole 132 through which the guide device 120 passes.
- the eccentric shaft 111 translates rotary motion of the rotary control button 110 into a linear displacement of the slide device 130 along the guide device 120.
- the slide device 130 also comprises a first pushing bar 133 and a second pushing bar 134.
- the eccentric shaft 111 rotates eccentrically and is displaced in a relative horizontal direction.
- the first pushing bar 133 and the second pushing bar 134 move to push the gear 51 and sleeve 43 respectively and this serves to disengage the gear 51 from the third pinion 31 and the teeth 33 from the sleeve 43.
- the control button 110 is rotated to move the slide device 130 to the left.
- the first pushing bar 133 moves to push the gear 51 which disengages the third pinion 31.
- the cylinder 50 loses rotary power and the aiguille 80 cannot drill.
- the sleeve 43 and the teeth 33 remain engaged so the aiguille 80 can hammer ( ie the hammer mode).
- the control button 110 is rotated to move the slide device 130 to the right.
- the second pushing bar 134 moves to push the sleeve 43 which disengages the teeth 33.
- the swing link 40 loses power and the aiguille 80 can not hammer.
- the gear 51 and the third pinion 31 remain engaged so the aiguille 80 can drill.
- the rotary control button 110 pivotally engages the shell 10 via an axial bolt 112.
- the shell 10 comprises three locking devices 11 to engage a fastening device 113 in three different positions respectively.
- a third spring 114 is disposed between the fastening device 113 and the rotary control button 110.
- Each of the locking devices 11 defines a groove for receiving the fastening device 113.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
- Drilling And Boring (AREA)
- Earth Drilling (AREA)
Abstract
The present invention provides a hammer drill comprising a shell (10)
in which is disposed a motor (20). The motor (20) drives an intermediate
shaft (30). A swing link is pivotally engaged with the intermediate
shaft (30) via clutches. A cylinder (50) comprises a gear (51) which
engages the intermediate shaft (30) and is movable along its axis
direction. The rotation of the cylinder (50) can drive a collet (70) so
as to drive an aiguille (80). A control mechanism (100) controls the
engagement/disengagement of the intermediate shaft (30) and the cylinder
(50) to realize three different working modes of the hammer drill.
Description
- The present invention relates to a hammer drill, more particularly to a hammer drill which can perform three functions, namely drill, hammer and hammer/drill functions.
- In building construction and other projects, there is frequently a need to drill into concrete. The hammer function of a hammer drill makes it easier to drill into hard concrete and improves the efficiency of drilling. Three-function hammer drills are known and have three different work modes: drill/ hammer/hammer drill. The operator can shift between the work modes to adapt to different working conditions. EP0775555B1 discloses a three-function hammer drill but its control mechanism for shifting between different work modes is complicated and very difficult to manufacture. There is therefore a need for a new three-function hammer drill to overcome the disadvantages of the prior art.
- The present invention relates to a three-function hammer drill whose control mechanism for shifting between different work modes is simple.
- Viewed from one aspect the present invention provides a hammer drill comprising:
- a shell;
- a rotary motor disposed in the shell, wherein the rotary motor comprises a rotary output shaft with a first pinion thereon;
- an intermediate rotary shaft comprising a second pinion engaging the first pinion, a clutch and a third pinion;
- a linear drive mechanism comprising a sleeve selectively engageable with the clutch;
- a transmitting mechanism connected to the linear drive mechanism, wherein the transmitting mechanism comprises a gear selectively engageable with the third pinion;
- an aiguille capable of rotary and linear movement which is engaged with the transmitting mechanism;
- a control mechanism comprising:
- a rotary control button pivotally mounted on the shell,
- a guide device fixed on the shell and
- a slide device slidably engaged with the guide device
- comprising a first pushing bar and a second pushing bar; and wherein in use the slide device is adapted to reciprocate rotary movement of the control button slidably along the guide device so as to selectively engage or disengage the gear and the third pinion or to selectively engage or disengage the clutch and the sleeve.
-
- Compared with the prior art, the control mechanism of the present invention for shifting between different work modes is simple and straightforwardly manufactured.
- In an embodiment of the invention, the transmitting mechanism transmits linear drive from the linear drive mechanism to the aiguille (ie in a hammer action). In an embodiment of the invention, the linear drive mechanism is a piston. In an embodiment of the invention, the transmitting mechanism is a cylinder.
- In an embodiment of the invention, the transmitting mechanism transmits rotary drive from the intermediate rotary shaft to the aiguille (ie in a drill action).
- Preferably the gear is movable along the axial direction of the transmitting mechanism.
- Preferably the guide device is fixed substantially longitudinally on the shell. Preferably the guide device is a linear guide device. Preferably the guide device is elongate.
- Preferably in use the slide device is adapted to linearly reciprocate rotary movement of the control button slidably along the guide device so as to selectively engage or disengage the gear and the third pinion or to selectively engage or disengage the teeth and the sleeve.
- Preferably the control button further comprises:
- an eccentric axle, wherein the slide device defines a slide channel for receiving the eccentric axle. Preferably the slide device defines a linear slide channel for receiving the eccentric shaft such that rotary movement of the rotary control button is translated by the eccentric shaft into linear displacement of the slide device along the guide device. Preferably the slide channel is substantially orthogonal to the guide device. The eccentric shaft may slide axially along the slide channel in response to rotary movement of the control button so as to push the first pushing bar or the second pushing bar to selectively engage or disengage the gear and the third pinion or to selectively engage or disengage the teeth and the sleeve. The first pushing bar is operable to push the gear so as to disengage the gear and the third pinion. The second pushing bar is operable to push the sleeve so as to disengage the sleeve and the teeth.
-
- Preferably a first resilient member (eg spring) urges the sleeve and clutch into engagement.
- Preferably a second resilient member urges the gear and the third pinion into engagement.
- Preferably the clutch comprises teeth.
- Preferably the slide device defines an access hole through which the guide device passes as the slide device slides along the guide device.
- Preferably the control button further comprises: a fastening device, wherein the shell comprises: a locking device for engaging the fastening device to lock the slide device relative to the guide device. The fastening device may be mounted substantially coaxially with the rotary control button.
- Preferably a third resilient member (eg spring) is disposed between the fastening device and the rotary control button, wherein the third resilient member urges the fastening device into engagement with the locking device. Preferably the locking device comprises at least three locking channels (eg on the shell) for selectively engaging the fastening device to lock the slide device relative to the guide device in at least three positions (ie the positions corresponding to the drilling mode, the hammer mode and the drilling and hammer mode respectively).
- The present invention will now be described in a non-limitative sense with reference to the accompanying Figures in which:
- Fig. 1 shows a cross-sectional view of a hammer drill in accordance with an embodiment of the present invention;
- Fig. 2 shows a partial cross-sectional view of the hammer drill in accordance with an embodiment of the present invention in hammer/drill mode;
- Fig. 3 shows a cross-sectional view of the control mechanism of the hammer drill of Fig. 2;
- Fig. 4 shows a partial cross-sectional view of the hammer drill in accordance with an embodiment of the present invention in hammer mode;
- Fig. 5 shows a cross-sectional view of the control mechanism of the hammer drill of Fig. 4;
- Fig. 6 shows a partial cross-sectional view of the hammer drill in accordance with an embodiment of the present invention in drill mode;
- Fig. 7 shows a cross-sectional view of the control mechanism of the hammer drill of Fig. 6; and
- Fig. 8 shows a cross-sectional view of Fig. 1 along A-A.
-
- Fig. 1 shows a hammer drill in accordance with an embodiment of the invention comprising a
shell 10 and amotor 20 disposed in theshell 10. Themotor 20 comprises an outputrotary shaft 21 with afirst pinion 22 thereon. An intermediaterotary shaft 30 is disposed parallel to the outputrotary shaft 20 and comprises asecond pinion 32 engaged with thefirst pinion 22 to transmit rotary power from the outputrotary shaft 20 to the intermediaterotary shaft 30 and to athird pinion 31. - A swing link comprises a
bearing 40 having asleeve 43 engaged withteeth 33 on the intermediaterotary shaft 30 and a connectingbar 41 connected to apiston 60. Afirst spring 42 is interposed between thebearing 40 and the intermediaterotary shaft 30 to urge thesleeve 43 and theteeth 33 into engagement so that theteeth 33 and thesleeve 43 perform a clutch function. - A
cylinder 50 covers thepiston 60 and comprises agear 51 engaged with thethird pinion 31. Thegear 51 can move along the axis of thecylinder 50. Asecond spring 52 is disposed on one side of thegear 51 to bring thegear 51 and thethird pinion 31 into engagement so as to transmit rotary power from the intermediaterotary shaft 30 to thecylinder 50. Thecylinder 50 is driven linearly by thepiston 60. Acollet 70 is mounted on one end of thecylinder 50 and anaiguille 80 is gripped in thecollet 70. - The hammer drill further comprises a
control mechanism 100 which is shown in outline in Figures 2, 4 and 6, in cross-section in Figures 3, 5 and 7 and in situ in Figure 8. Thecontrol mechanism 100 itself comprises arotary control button 110, aguide device 120 and aslide device 130. Therotary control button 110 has aneccentric shaft 111 parallel to its rotary axis. Theslide device 130 defines aslide channel 131 which receives theeccentric shaft 111 and anaccess hole 132 through which theguide device 120 passes. Theeccentric shaft 111 translates rotary motion of therotary control button 110 into a linear displacement of theslide device 130 along theguide device 120. Theslide device 130 also comprises a first pushingbar 133 and a second pushingbar 134. By rotating thecontrol button 110, theeccentric shaft 111 rotates eccentrically and is displaced in a relative horizontal direction. The first pushingbar 133 and the second pushingbar 134 move to push thegear 51 andsleeve 43 respectively and this serves to disengage thegear 51 from thethird pinion 31 and theteeth 33 from thesleeve 43. - Referring to Figs. 2 and 3, when the
slide device 130 is in the middle position, the first pushingbar 133 and the second pushingbar 134 do not push thegear 51 and thesleeve 43. Power is transmitted to thecylinder 50 and theswing link 40 respectively via the engagement of thegear 51 with thethird pinion 31 and thesleeve 43 with theteeth 33 so that thecylinder 50 makes theaiguille 80 drill via thecollet 70 and theswing link 40 drives thepiston 60 to make theaiguille 80 hammer (ie the hammer drill mode). - Referring to Figs. 4 and 5, the
control button 110 is rotated to move theslide device 130 to the left. The first pushingbar 133 moves to push thegear 51 which disengages thethird pinion 31. Thecylinder 50 loses rotary power and theaiguille 80 cannot drill. Thesleeve 43 and theteeth 33 remain engaged so theaiguille 80 can hammer (ie the hammer mode). - Referring to Figs. 6 and 7 (ie the drill mode), the
control button 110 is rotated to move theslide device 130 to the right. The second pushingbar 134 moves to push thesleeve 43 which disengages theteeth 33. Theswing link 40 loses power and theaiguille 80 can not hammer. Thegear 51 and thethird pinion 31 remain engaged so theaiguille 80 can drill. - Referring to Fig. 8, the
rotary control button 110 pivotally engages theshell 10 via anaxial bolt 112. Theshell 10 comprises threelocking devices 11 to engage afastening device 113 in three different positions respectively. Athird spring 114 is disposed between thefastening device 113 and therotary control button 110. Each of thelocking devices 11 defines a groove for receiving thefastening device 113. When therotary control button 110 is in one of the drill/hammer/drill and hammer positions, thefastening device 113 is urged into engagement with a corresponding one of thelocking devices 11 by thethird spring 114. When it is desired to shift the working mode, thefastening device 113 is pushed downwardly to disengage thelocking device 11 so that therotary control button 110 can rotate freely.
Claims (5)
- A hammer drill comprising:a shell 10;a rotary motor 20 disposed in the shell 10, wherein the rotary motor 20 comprises a rotary output shaft 21 with a first pinion 22 thereon;an intermediate rotary shaft 30 comprising a second pinion 22 engaging the first pinion 22, a clutch 33 and a third pinion 31;a linear drive mechanism 40 comprising a sleeve 43 selectively engageable with the clutch 33;a transmitting mechanism 50 connected to the linear drive mechanism 40, wherein the transmitting mechanism 50 comprises a gear 51 selectively engageable with the third pinion 31;an aiguille 80 capable of rotary and linear movement which is engaged with the transmitting mechanism 50;a control mechanism 100 comprising:a rotary control button 110 pivotally mounted on the shell 10,a guide device 120 fixed on the shell 10 anda slide device 130 slidably engaged with the guide device 120 comprising a first pushing bar 133 and a second pushing bar 134; and
- A hammer drill as claimed in claim 1 wherein the control button 110 further comprises:an eccentric shaft 111, wherein the slide device 130 defines a slide channel 131 for receiving the eccentric shaft 111 such that rotary movement of the rotary control button 110 is translated by the eccentric shaft 111 into linear displacement of the slide device 130 along the guide device 120.
- A hammer drill as claimed in claim 1 or 2, wherein the slide device 130 defines an access hole 132 through which the guide device 120 passes as the slide device 130 slides along the guide device 120.
- A hammer drill as claimed in claim 1, 2 or 3 wherein the control button 110 further comprises:a fastening device 113,a locking device 11 for engaging the fastening device 113 to lock the slide device 130 relative to the guide device 120.
- A hammer drill as claimed in claim 4 wherein a spring 114 is disposed between the fastening device 113 and the rotary control button 110 and the locking device 11 comprises at least three locking channels for selectively engaging the fastening device 113 to lock the slide device 130 relative to the guide device 120 in at least three positions.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNU2003201202169U CN2661382Y (en) | 2003-12-02 | 2003-12-02 | Hammer anvil |
CH320120216 | 2003-12-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1537955A2 true EP1537955A2 (en) | 2005-06-08 |
Family
ID=34347932
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20040257265 Withdrawn EP1537955A2 (en) | 2003-12-02 | 2004-11-23 | Hammer drill |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1537955A2 (en) |
CN (1) | CN2661382Y (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008000545A1 (en) * | 2006-06-27 | 2008-01-03 | Robert Bosch Gmbh | Electric hand tool |
JP2009279738A (en) * | 2008-05-26 | 2009-12-03 | Max Co Ltd | Drive tool |
CN105515287A (en) * | 2016-02-01 | 2016-04-20 | 浙江绿动电机科技有限公司 | Water drilling tool |
JP2016129911A (en) * | 2015-01-13 | 2016-07-21 | 株式会社マキタ | Power tool |
WO2017073236A1 (en) * | 2015-10-30 | 2017-05-04 | 日立工機株式会社 | Hammer drill |
US10046450B2 (en) | 2014-07-28 | 2018-08-14 | Black & Decker Inc. | Mode change knob assembly |
WO2021036095A1 (en) * | 2019-08-28 | 2021-03-04 | 浙江信源电器制造有限公司 | Novel electric hammer |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201067814Y (en) * | 2005-05-26 | 2008-06-04 | 松下电工株式会社 | Hammer drill |
CN2920563Y (en) * | 2006-07-11 | 2007-07-11 | 王文江 | Light single-span four function electric hammer |
DE102008040031A1 (en) * | 2008-06-30 | 2009-12-31 | Robert Bosch Gmbh | Multi-speed transmission device and machine tool |
DE102008054692A1 (en) | 2008-12-16 | 2010-06-17 | Robert Bosch Gmbh | Hand tool |
CN105569558A (en) * | 2016-03-07 | 2016-05-11 | 湖州中辰建设有限公司 | Percussion drill with pneumatic piston device |
-
2003
- 2003-12-02 CN CNU2003201202169U patent/CN2661382Y/en not_active Expired - Lifetime
-
2004
- 2004-11-23 EP EP20040257265 patent/EP1537955A2/en not_active Withdrawn
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008000545A1 (en) * | 2006-06-27 | 2008-01-03 | Robert Bosch Gmbh | Electric hand tool |
JP2009279738A (en) * | 2008-05-26 | 2009-12-03 | Max Co Ltd | Drive tool |
US10046450B2 (en) | 2014-07-28 | 2018-08-14 | Black & Decker Inc. | Mode change knob assembly |
JP2016129911A (en) * | 2015-01-13 | 2016-07-21 | 株式会社マキタ | Power tool |
WO2017073236A1 (en) * | 2015-10-30 | 2017-05-04 | 日立工機株式会社 | Hammer drill |
CN105515287A (en) * | 2016-02-01 | 2016-04-20 | 浙江绿动电机科技有限公司 | Water drilling tool |
WO2021036095A1 (en) * | 2019-08-28 | 2021-03-04 | 浙江信源电器制造有限公司 | Novel electric hammer |
Also Published As
Publication number | Publication date |
---|---|
CN2661382Y (en) | 2004-12-08 |
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