EP1697090A1 - SCHLAGWERK FüR EINE REPETIEREND SCHLAGENDE HANDWERKZEUGMASCH INE - Google Patents
SCHLAGWERK FüR EINE REPETIEREND SCHLAGENDE HANDWERKZEUGMASCH INEInfo
- Publication number
- EP1697090A1 EP1697090A1 EP04820385A EP04820385A EP1697090A1 EP 1697090 A1 EP1697090 A1 EP 1697090A1 EP 04820385 A EP04820385 A EP 04820385A EP 04820385 A EP04820385 A EP 04820385A EP 1697090 A1 EP1697090 A1 EP 1697090A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- racket
- pressure
- tool
- mechanism according
- gas
- 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.)
- Granted
Links
- 230000007246 mechanism Effects 0.000 title claims abstract description 23
- 230000000903 blocking effect Effects 0.000 claims abstract description 21
- 238000009527 percussion Methods 0.000 claims description 9
- 230000003252 repetitive effect Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000035559 beat frequency Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
Classifications
-
- 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
- B25D11/005—Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
- B25D9/14—Control devices for the reciprocating piston
- B25D9/26—Control devices for adjusting the stroke of the piston or the force or frequency of impact thereof
-
- 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
- B25D2250/195—Regulation means
-
- 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
- B25D2250/195—Regulation means
- B25D2250/201—Regulation means for speed, e.g. drilling or percussion speed
-
- 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
- B25D2250/351—Use of pins
Definitions
- the present invention relates to a striking mechanism for a repetitive striking hand machine tool - preferably a hammer drill and / or percussion hammer, which has a club which can be moved axially back and forth in a guide tube, with a device which exerts pressure on the club, with which the club moves forward is displaceable in the direction of a tool that can be used in the handheld power tool.
- Such a repetitive impact movement for a electropneumatic hammer drill and / or percussion hammer consists of an eccentric drive, a piston and a striker. With these three elements, a rotary movement is converted into a lifting movement.
- the club moves axially back and forth in a guide tube in the following ways:
- the piston which is moved in the forward direction by the eccentric drive, compresses the air cushion between the piston and the racket, causing it to fly freely towards the tool inserted into the machine.
- the racket releases its impact energy to the tool, where it receives a pulse in the reverse direction.
- the piston is also moved back by the eccentric drive, which creates a certain vacuum in the air cushion between the piston and the racket.
- the air cushion between the two is compressed and there is a compression with the result that the club then moves in at an even higher speed when the piston moves forward again Flying towards the tool.
- Such a compression striking mechanism is technically relatively complex because, in addition to the racket moving in the axial direction, it requires an eccentric drive with a piston which can also be displaced in the axial direction. An independent adjustment of the stroke frequency and the stroke strength is not possible with such a compression hammer mechanism.
- the invention is therefore based on the object of specifying a percussion mechanism of the type mentioned at the outset which can be implemented using the simplest possible technical means.
- the striking mechanism according to the invention requires few mechanical parts that execute a movement and is therefore less susceptible to wear.
- this striking mechanism which unlike conventional compression striking mechanisms has no eccentric drive and no piston, enables a compact design.
- the striking frequency of the striking mechanism and the striking strength can be controlled independently of one another.
- the device exerting pressure on the racket advantageously consists of a pressure storage space which can be filled with a gas and which is located on the side of the racket opposite the tool.
- the gas - preferably air - can be supplied to the pressure storage space via an inlet valve, the amount of gas supplied and thus the pressure exerted on the racket being controllable.
- a pump device can be provided, which is arranged, for example, in the handheld power tool.
- the pressure storage space predeterminable maximum value.
- the blocking time of the blocking element can advantageously be controlled as a function of a predetermined or operable beat frequency and / or as a function of the pressure level in the pressure storage space.
- FIG. 1 shows a longitudinal section through a hammer drill or percussion hammer with a striking mechanism and FIG. 2 shows a section of the striking mechanism with a control for the racket.
- FIG. 1 a drill or percussion hammer is exemplarily shown in a longitudinal section as a repeatingly striking hand power tool, FIG. 1 being essentially restricted to those parts that belong to the percussion mechanism of the drill or percussion hammer.
- the hammer drill or percussion hammer has a guide tube 1, in which a striker 2 is mounted so that it can move axially forwards and backwards.
- a tool holder 3 is connected to the guide tube 1, in which a tool 4, for example a drill or chisel, can also be moved within certain limits in the axial direction.
- a pressure storage space 5 filled with a gas, preferably air. This pressure storage space 5 is supplied with an inlet valve 6 by a pump device 7 with gas filled.
- the pump device 7 is arranged in the hand-held power tool itself.
- the pump device 7 can also be located outside the handheld power tool and can be connected to the inlet valve 6 via a pressure line.
- the amount of gas supplied to the pressure storage chamber 5 from the pump device 7 can be controlled via the inlet valve 6, which is an electrically controllable valve, for example.
- the pressure acting on the racket 2 and thus the impact strength exerted by the racket 2 on the tool 4 depends from the amount of gas supplied to the pressure storage chamber 5.
- the impact strength of the rotary hammer or impact hammer can be controlled via the amount of gas supplied to the pressure storage space 5. It is expedient to provide an outlet valve 8 in the pressure storage space 5, which limits the gas pressure in the pressure storage space 5 to a predeterminable maximum value.
- the racket 2 is in a starting position in which it closes a gas outlet opening 9 located in the guide tube 1.
- the racket 2 is held by a locking element 10.
- the locking element 10 is, for example, a bolt which can penetrate through an opening 11 in the side wall of the guide tube 1 into a recess 12 in the racket 2. If the blocking element 10 is now pulled out of the recess 12 of the racket 2, the racket 2 flies towards the tool 4 in the forward direction due to the gas pressure in the pressure storage space 5 and at the same time releases the gas outlet opening 9 in the guide tube 1.
- the bat 2 flies towards the tool 4 and emits its impact impulse to the tool 4, the gas pressure discharges through the gas outlet opening 9 on the rear side of the bat 2 facing the pressure storage space 5.
- the kickback pulse on the tool 4 causes the striker 2 to be moved in the backward direction toward the pressure storage space 5 and to close the gas outlet opening 9 again.
- the backward movement of the striker 2 can also be supported by a compression spring 13 located on its front side facing the tool 4 or by a mechanical (e.g. pneumatic) or electrically acting device with a similar effect. If the racket 2 has reached the starting position again after its backward movement, it is blocked by the blocking element 10, which in turn penetrates into the depression 12 in the racket 2. If the locking element 10 is pulled out of the recess 12 of the racket 2 again, the racket 2 makes a new forward movement and thereby exerts another blow on the tool 4. It can be seen that the beat frequency of the racket 2 can be controlled solely by the length of the blocking time of the blocking element 10.
- the illustration shows a section of the racket 2 with the locking element 10 and a device for controlling the locking element 10.
- the locking element can be controlled in a locking or unlocking position, for example on the principle of an electromagnet.
- the blocking element 10 forms a core of an energizable coil 14, which is made of a ferromagnetic material.
- the coil 14 is located in a dome 15 placed on the guide tube 1 via its opening 11. When the coil 14 is energized, the blocking element 10 becomes due to electromagnetic forces pulled into the dome 15, whereby the locking element 10 moves out of the recess 12 of the racket 2 and unlocks the racket 2.
- a spring 16 located in the dome presses the locking element 10 back through the opening 11 in the guide tube 1 onto the racket 2.
- the racket 2 is in its backward movement and reaches the location of the recess 12 Locking element 10, the locking element 10 automatically slides into the recess 12 due to the spring force 16 and locks the racket 2 in its starting position.
- the current flow through the coil 14 and thus the blocking time of the blocking element 10 is controlled by a control unit 17.
- Actuators for the control unit 17 can be, for example, an actuator 18 for the stroke frequency that can be actuated by the operator of the hand-held power tool or a pressure sensor 19 that detects the gas pressure in the pressure storage space 5. It is thus possible to control the blocking time of the blocking element 10 as a function of a stroke frequency which can be selected by the operator and / or as a function of the pressure level in the pressure storage space 5.
- a fixed beat frequency can also be specified for the control unit 17, which accordingly controls the current flow through the coil 14.
- the control unit 17 can also be supplied with other manipulated variables for the stroke frequency.
- control unit 17 can also be used to control the gas pressure in the pressure storage chamber 5 via the electrically controllable inlet valve 6. This allows the punch strength to be controlled.
- another actuator 20 that can be actuated by the operator of the hand-held power tool must be provided.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Percussive Tools And Related Accessories (AREA)
- Portable Nailing Machines And Staplers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10359572A DE10359572A1 (de) | 2003-12-18 | 2003-12-18 | Schlagwerk für eine repetierend schlagende Handwerkzeugmaschine |
PCT/DE2004/002392 WO2005058551A1 (de) | 2003-12-18 | 2004-10-27 | Schlagwerk für eine repetierend schlagende handwerkzeugmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1697090A1 true EP1697090A1 (de) | 2006-09-06 |
EP1697090B1 EP1697090B1 (de) | 2008-03-26 |
Family
ID=34683539
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04820385A Expired - Fee Related EP1697090B1 (de) | 2003-12-18 | 2004-10-27 | Schlagwerk für eine repetierend schlagende handwerkzeugmaschine |
Country Status (6)
Country | Link |
---|---|
US (2) | US7516801B2 (de) |
EP (1) | EP1697090B1 (de) |
CN (1) | CN100482423C (de) |
DE (2) | DE10359572A1 (de) |
ES (1) | ES2302078T3 (de) |
WO (1) | WO2005058551A1 (de) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7493682B2 (en) * | 2006-04-04 | 2009-02-24 | Richardson Thomas W | Apparatus and system for installing rivets in belt fasteners |
WO2008040535A1 (de) * | 2006-10-03 | 2008-04-10 | Delunamagma Industries Gmbh | Holzspalter |
DE102012206452A1 (de) * | 2012-04-19 | 2013-10-24 | Hilti Aktiengesellschaft | Handwerkzeugmaschine und Steuerungsverfahren |
US9416593B2 (en) | 2012-12-28 | 2016-08-16 | Smith International, Inc. | Piston strike face and bit interface for percussion hammer drill |
US10363651B2 (en) * | 2015-09-28 | 2019-07-30 | Caterpillar Inc. | Hammer assembly |
US10179424B2 (en) * | 2015-10-28 | 2019-01-15 | Caterpillar Inc. | Diagnostic system for measuring acceleration of a demolition hammer |
JP6577830B2 (ja) * | 2015-10-28 | 2019-09-18 | 株式会社マキタ | 電動工具 |
SE539844C2 (sv) * | 2016-02-16 | 2017-12-19 | Construction Tools Pc Ab | Load-based control of breaker tool |
JP6901346B2 (ja) | 2017-08-09 | 2021-07-14 | 株式会社マキタ | 電動作業機 |
JP6916060B2 (ja) * | 2017-08-09 | 2021-08-11 | 株式会社マキタ | 電動作業機 |
EP3697574A1 (de) | 2017-10-20 | 2020-08-26 | Milwaukee Electric Tool Corporation | Schlagwerkzeug |
US11059155B2 (en) | 2018-01-26 | 2021-07-13 | Milwaukee Electric Tool Corporation | Percussion tool |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE479472C (de) | 1927-11-28 | 1929-07-16 | Nordiska Armaturfab Ab | Schlagwerkzeug, bei dem eine kreisende Antriebsbewegung umgesetzt wird in eine Schlagbewegung |
DE3224176C2 (de) * | 1982-06-29 | 1995-02-02 | Bosch Gmbh Robert | Motorisch angetriebene schlagende Handwerkzeugmaschine |
DE3526162A1 (de) * | 1985-07-22 | 1987-01-22 | Black & Decker Inc | Bohrhammer sowie bohrhammerwerkzeug |
DE4343583B4 (de) * | 1993-12-21 | 2005-03-24 | Robert Bosch Gmbh | Bohrhammer |
DE19810088C1 (de) | 1998-03-10 | 1999-08-26 | Bosch Gmbh Robert | Bohr- und/oder Schlaghammer mit in Abhängigkeit von der Einstecktiefe eines Werkzeuges aktivierbarem Schlagwerk |
DE19933972A1 (de) * | 1999-07-20 | 2001-01-25 | Bosch Gmbh Robert | Bohr- oder Schlaghammer |
DE10030962C2 (de) * | 2000-06-24 | 2002-06-20 | Hilti Ag | Elektrohandwerkzeuggerät mit Schlagwerk |
DE10122820A1 (de) * | 2001-05-11 | 2002-11-21 | Bosch Gmbh Robert | Handwerkzeugmaschine |
DE10127103B4 (de) * | 2001-06-02 | 2008-08-21 | Robert Bosch Gmbh | Werkzeughalterung |
DE10152959B4 (de) * | 2001-10-26 | 2007-03-15 | Robert Bosch Gmbh | Handwerkzeugmaschine |
US7023683B1 (en) * | 2002-09-04 | 2006-04-04 | Yazaki North America, Inc | Electric relay control circuit |
-
2003
- 2003-12-18 DE DE10359572A patent/DE10359572A1/de not_active Withdrawn
-
2004
- 2004-10-27 DE DE502004006693T patent/DE502004006693D1/de active Active
- 2004-10-27 US US10/553,300 patent/US7516801B2/en not_active Expired - Fee Related
- 2004-10-27 WO PCT/DE2004/002392 patent/WO2005058551A1/de active IP Right Grant
- 2004-10-27 EP EP04820385A patent/EP1697090B1/de not_active Expired - Fee Related
- 2004-10-27 CN CNB200480037696XA patent/CN100482423C/zh not_active Expired - Fee Related
- 2004-10-27 ES ES04820385T patent/ES2302078T3/es active Active
-
2009
- 2009-02-17 US US12/372,305 patent/US7677327B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2005058551A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN1894077A (zh) | 2007-01-10 |
ES2302078T3 (es) | 2008-07-01 |
CN100482423C (zh) | 2009-04-29 |
US20090145619A1 (en) | 2009-06-11 |
US7677327B2 (en) | 2010-03-16 |
US7516801B2 (en) | 2009-04-14 |
EP1697090B1 (de) | 2008-03-26 |
DE10359572A1 (de) | 2005-07-28 |
US20060196683A1 (en) | 2006-09-07 |
WO2005058551A1 (de) | 2005-06-30 |
DE502004006693D1 (de) | 2008-05-08 |
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