EP0444030A1 - Bohrhammer. - Google Patents
Bohrhammer.Info
- Publication number
- EP0444030A1 EP0444030A1 EP19890905644 EP89905644A EP0444030A1 EP 0444030 A1 EP0444030 A1 EP 0444030A1 EP 19890905644 EP19890905644 EP 19890905644 EP 89905644 A EP89905644 A EP 89905644A EP 0444030 A1 EP0444030 A1 EP 0444030A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- intermediate shaft
- hammer drill
- drill according
- gear
- toothing
- 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
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
- B25D2216/0046—Preventing rotation
Definitions
- the invention is based on a hammer drill according to the type of claim 1.
- a hammer drill is already known which has a clutch for switching off the striking mechanism, which can be switched with the aid of the intermediate shaft.
- the rotary motion constantly transferred from the motor to the tool holder cannot be switched off.
- Such a hammer is therefore not suitable for chiseling.
- the hammer drill according to the invention with the characterizing features of claim 1 has the advantage, in contrast, that the rotary movement can be switched off arbitrarily and in a simple manner for pure impact operation.
- the consequence of this is that the hammer can work in three different operating states: pure drilling, percussion drilling and pure hitting.
- an additional chisel attachment on the tool holder, with which the rotary drive could be switched off in previous hammers is unnecessary for the hammer according to the invention.
- the switchover to the different operating states is carried out in a user-friendly manner by means of a single shift lever.
- Advantageous further developments and improvements of the rotary hammer specified in claim 1 are possible through the measures listed in claims 2 ff.
- a third coupling according to claims 2 and 3 is particularly advantageous, with which the tool holder can optionally be locked in a rotationally fixed manner or set in the freely rotatable state during impact operation.
- the tool holder is locked in a rotationally fixed manner, all chisel work can be carried out as well as with a pure chisel hammer. Since the intermediate shaft is also fixed, no energy is lost due to unnecessary rotation of parts of the percussion drive.
- Claims 4 to 6 offer the advantage that all operating states of the hammer can be set at a single switch.
- a bearing between the intermediate shaft rotating in the drilling operating states and the displacement part for axially displacing the intermediate shaft reduces wear on the switching device.
- Figure 1 shows a longitudinal section through an inventive hammer drill, in which the intermediate shaft is shown in different positions
- Figure 2 shows a second embodiment in a section showing the intermediate shaft
- Figure 3 shows in cross section a switching device. Description of the embodiment
- the hammer drill 1 contains in its housing 2 essentially a motor 3, a gear 4, a striking mechanism 5 designed as an air cushion hammer mechanism and a tool holder 6 into which a tool 7 suitable for the respective application can be inserted.
- the motor 3 has a pinion 8, which is always in engagement with an outer ring gear 9 of a clutch gear 10.
- the gear wheel 10 has a toothing 11 on its end face. It is under the action of a compression spring 12, which in turn is supported against an axial bearing 14 bearing against the housing part 13.
- the coupling gearwheel 10 is rotatably supported on an intermediate shaft 17 by means of an axially displaceable needle bearing 16.
- the intermediate shaft 17 has a thickened central part 18, on the right side of which facing the clutch gear 10 there is arranged a counter toothing 19 which can be coupled to the toothing 11.
- a longitudinal toothing 20 At the other end of the middle part 18 there is a longitudinal toothing 20 which, with its left end facing away from the clutch gearwheel 10, can be engaged in teeth 21 connected to the housing 2 in a manner fixed against relative rotation.
- the left end of the intermediate shaft 17 is axially displaceably mounted in a needle bearing 22 located in the housing 2.
- a ball bearing 23 is pressed onto the central part 18 following the longitudinal toothing 20, the outer ring of which serves as a projection 24, on which a switching device for axially displacing the intermediate shaft 17 acts.
- the inner ring of the ball bearing 23 can also be incorporated directly into the intermediate shaft 17.
- the ball bearing 23 can also be replaced by a more cost-effective solution with a collar 26 on the intermediate shaft 17, on which two disks 27, 28 engage. For their part, these are ne projection 24 'connected. Otherwise, the second exemplary embodiment corresponds exactly to the first in FIG. 1.
- the rotary hammer 1 comprises a movement conversion gear, which in the exemplary embodiment is designed as a wobble gear.
- a wobble hub 30 is supported in needle bearings 31 and 32.
- the wobble hub is mounted in a ball bearing 33 designed as a fixed bearing in the housing part 13, the inner ring for the bearing 33 being formed by the wobble hub 30 itself.
- the outer ring 34 is fixed to a shoulder 35 of the housing part 13 and by a retaining ring 36.
- the wobble hub 30 has a running groove 37 with an oblique axis to the axis of the intermediate shaft 17.
- the raceway 37 forms the inner raceway for a ball bearing 38, the outer ring of which is designed as a swash plate 39.
- a finger 40 formed on the swash plate 39 drives the striking mechanism 5.
- the wobble hub 30 has counter-toothing 41 which can be coupled to the toothing 11 of the clutch gear 10.
- the striking mechanism 5 is guided in a tube 43 which is connected to the tool holder 6 and can be driven via a toothed wheel 44.
- the gear 44 engages in the longitudinal toothing 20 of the intermediate shaft 17 and is connected to the tube 43 via a spring-loaded safety coupling 45.
- the switching device for the intermediate shaft 17 can be seen from FIG.
- the shift lever 47 has a shaft 48 which passes through the housing 2 and has an eccentric pin 49.
- the eccentric pin engages in a fork 50 of the projection 24 or 24 'in such a way that a rotation of the shift lever 47 causes an axial displacement of the projection 24 or 24'.
- the hammer 1 can be operated in four ways. In Figure 1, the upper half of the clutch gear 10 and the intermediate shaft 17 is shown in the drilling operating position. The rotational movement of the motor pinion 8 is transmitted to the intermediate shaft 17 via the clutch gear 10 and the clutch 11/19.
- the intermediate shaft 17 drives the gear 44 via its longitudinal toothing 20.
- the wobble hub 30 is not driven, the entire striking mechanism 5 and the motion converting gear stand still.
- the safety clutch 45 serves to protect the operator. If the drill bit jams, it will disengage to prevent the hammer from turning suddenly.
- FIG. 1 The lower halves of the clutch gear 10 and the intermediate shaft 17 are shown in FIG. 1 in the operating position hammer drilling, in which the intermediate shaft 17 has been shifted to the left with the aid of the projection 24 or 24 '. This is done by turning the shift lever 47.
- the clutch gear 10 follows the intermediate shaft 17 following the pressure of the spring 12 until it engages with its toothing 11 in the counter toothing 41 of the wobble mechanism 30. Now both the intermediate shaft 17 for transmitting the rotary drive and the wobble hub for switching on the striking mechanism are driven in rotation via the toothing 11.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
- Drilling And Boring (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3819125 | 1988-06-04 | ||
DE3819125A DE3819125A1 (de) | 1988-06-04 | 1988-06-04 | Bohrhammer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0444030A1 true EP0444030A1 (de) | 1991-09-04 |
EP0444030B1 EP0444030B1 (de) | 1993-03-31 |
Family
ID=6355914
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89905644A Expired - Lifetime EP0444030B1 (de) | 1988-06-04 | 1989-05-27 | Bohrhammer |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0444030B1 (de) |
JP (1) | JP2703637B2 (de) |
DE (2) | DE3819125A1 (de) |
WO (1) | WO1989011955A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2428757A (en) * | 2005-08-04 | 2007-02-07 | Bosch Gmbh Robert | An electric hand tool with mode changing device operated by axial movement of a layshaft |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2828657B2 (ja) * | 1989-04-25 | 1998-11-25 | 松下電工株式会社 | ハンマードリル |
DE3919936A1 (de) * | 1989-06-19 | 1990-12-20 | Bosch Gmbh Robert | Bohr- oder schlaghammer |
DE3932413A1 (de) * | 1989-09-28 | 1991-04-11 | Bosch Gmbh Robert | Bohrhammer |
DE9015285U1 (de) * | 1990-02-13 | 1991-06-06 | Kiefer, Klaus Jürgen, 2000 Hamburg | Hand-Werkzeugmaschine für mehrere Arbeits-Funktionen |
US5025562A (en) * | 1990-03-01 | 1991-06-25 | Milwaukee Electric Tool Corporation | Counterbalanced reciprocating mechanism |
DE4013512A1 (de) * | 1990-04-27 | 1991-10-31 | Black & Decker Inc | Schalteinrichtung zum umschalten eines kraftgetriebenen werkzeugs |
DE19545260A1 (de) * | 1995-11-24 | 1997-05-28 | Black & Decker Inc | Bohrhammer |
JP3582760B2 (ja) * | 1997-04-18 | 2004-10-27 | 日立工機株式会社 | ハンマドリル |
DE102004019778B4 (de) | 2004-04-23 | 2022-04-28 | Robert Bosch Gmbh | Schaltstück |
DE102004020177A1 (de) | 2004-04-24 | 2005-11-17 | Robert Bosch Gmbh | Handwerkzeugmaschine mit einem drehenden und/oder schlagenden Antrieb |
DE102005047600A1 (de) * | 2005-10-05 | 2007-04-12 | Robert Bosch Gmbh | Handwerkzeugmaschine mit einer Welle und mit einem auf der Welle gelagerten Hubantriebslager |
DE102006056853A1 (de) * | 2006-12-01 | 2008-06-05 | Robert Bosch Gmbh | Handwerkzeugmaschine |
DE102007001494B3 (de) | 2007-01-10 | 2008-07-10 | Aeg Electric Tools Gmbh | Handgeführter Bohrhammer |
DE102007062248A1 (de) | 2007-12-21 | 2009-06-25 | Robert Bosch Gmbh | Handwerkzeugmaschine mit einer, mindestens eine drehbar gelagerte Zwischenwelle umfassenden Getriebevorrichtung |
JP5181718B2 (ja) * | 2008-02-22 | 2013-04-10 | 日立工機株式会社 | ハンマドリル |
DE102008054692A1 (de) | 2008-12-16 | 2010-06-17 | Robert Bosch Gmbh | Handwerkzeugmaschine |
CN102975174B (zh) * | 2012-12-11 | 2015-07-08 | 浙江奔宇工具有限公司 | 电锤的传动切换装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3837409A (en) * | 1973-02-26 | 1974-09-24 | Skil Corp | Rotary hammer power tool |
DE2728961C2 (de) * | 1977-06-27 | 1991-08-08 | Hilti Ag, Schaan | Bohrhammer mit arretierbarem Werkzeughalter |
DE3039669A1 (de) * | 1980-10-21 | 1982-05-27 | Robert Bosch Gmbh, 7000 Stuttgart | Bohrhammer |
GB2121717B (en) * | 1982-06-02 | 1985-09-18 | Black & Decker Inc | Improvements in or relating to rotary percussive drills |
DE3235400A1 (de) * | 1982-09-24 | 1984-03-29 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Elektrowerkzeug fuer reinen bohrbetrieb, fuer schlag- oder hammerbohrbetrieb sowie fuer reinen schlagbetrieb |
DE3329005A1 (de) * | 1983-08-11 | 1985-02-28 | Robert Bosch Gmbh, 7000 Stuttgart | Bohrhammer |
DE3538166A1 (de) * | 1985-10-26 | 1987-04-30 | Hilti Ag | Bohrhammer mit dreharretierung |
-
1988
- 1988-06-04 DE DE3819125A patent/DE3819125A1/de not_active Withdrawn
-
1989
- 1989-05-27 WO PCT/DE1989/000336 patent/WO1989011955A1/de active IP Right Grant
- 1989-05-27 EP EP89905644A patent/EP0444030B1/de not_active Expired - Lifetime
- 1989-05-27 JP JP1505382A patent/JP2703637B2/ja not_active Expired - Lifetime
- 1989-05-27 DE DE8989905644T patent/DE58903984D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO8911955A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2428757A (en) * | 2005-08-04 | 2007-02-07 | Bosch Gmbh Robert | An electric hand tool with mode changing device operated by axial movement of a layshaft |
GB2428757B (en) * | 2005-08-04 | 2007-11-07 | Bosch Gmbh Robert | An electric hand tool with a mode changing device |
Also Published As
Publication number | Publication date |
---|---|
JP2703637B2 (ja) | 1998-01-26 |
DE3819125A1 (de) | 1989-12-14 |
EP0444030B1 (de) | 1993-03-31 |
JPH03504697A (ja) | 1991-10-17 |
DE58903984D1 (de) | 1993-05-06 |
WO1989011955A1 (en) | 1989-12-14 |
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Legal Events
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