EP0318480B1 - Dispositif d'arret d'outils a percussion - Google Patents

Dispositif d'arret d'outils a percussion Download PDF

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Publication number
EP0318480B1
EP0318480B1 EP19870904493 EP87904493A EP0318480B1 EP 0318480 B1 EP0318480 B1 EP 0318480B1 EP 19870904493 EP19870904493 EP 19870904493 EP 87904493 A EP87904493 A EP 87904493A EP 0318480 B1 EP0318480 B1 EP 0318480B1
Authority
EP
European Patent Office
Prior art keywords
hammer drill
impacter
retaining elements
elements
retaining
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.)
Expired - Lifetime
Application number
EP19870904493
Other languages
German (de)
English (en)
Other versions
EP0318480A1 (fr
Inventor
Johann Kaltenecker
Gerhard Meixner
Hans-Ulrich MÜTSCHELE
Ulrich Rauser
Karl Wanner
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0318480A1 publication Critical patent/EP0318480A1/fr
Application granted granted Critical
Publication of EP0318480B1 publication Critical patent/EP0318480B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
    • 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 spline toothing of the swash plate can be brought out of engagement with the drive toothing on a special intermediate shaft externally by turning a lever, but this requires a great deal of design effort.
  • the hammer drill according to the invention with the characterizing features of the main claim has the advantage that a substantial reduction in price is achieved by the simpler design of the impact switch. It can be used in any operating condition of the hammer drill the impact stop can be switched on and off without gear wear.
  • the novel impact cut-off device can be installed in a space-saving manner in the area of the guide tube and can alternatively also be used when a conventional cut-off can not be implemented elsewhere, for example for reasons of space.
  • both the automatic idle shutdown and the decommissioning of the hammer mechanism for pure drilling operation are carried out by one and the same component. This also results in a more compact and lighter construction of the rotary hammer.
  • Figure 1 shows a partially cut side view
  • Figure 2 shows the tool end of a rotary hammer according to the invention in longitudinal section according to another embodiment.
  • the hammer mechanism 2, the tool holder 3 with tool 4 and parts of the housing 5 are shown in FIG. 1 of a hammer drill 1.
  • the striker 6 is located within a pot piston 7 which is surrounded by a guide tube 8, the front end of which facing the tool 4 has an inwardly directed collar 9 with teeth 10.
  • the toothing 10 constantly engages in a toothing 11 of the firing pin 12 which receives the tool.
  • the toothing 11 is flattened in the central region of the firing pin 12, so that a wide groove 13 is formed. After the groove 13, the toothing 11 again has a thickening 14 on which one or more holding elements 15 designed here as pawls protrude inwards Middle part 16 abut.
  • the individual holding elements 15 are connected in a rotationally fixed manner to the firing pin 12 and thus also to the guide tube 8 by means of a perforated disk 17 with an internal toothing corresponding to the toothing 11 and fixed at their mutual distance from one another.
  • the disc 17 also serves as a limitation for the damping element 18 with an O-ring 19 and as a stop for the outward projections 20 of the holding elements 15.
  • a spring ring 21 is arranged on the outside around the holding elements 15 between the projections 20 and the collar 9 and presses the holding elements 15 inwards against the firing pin 12.
  • a second weaker spring ring 22 holds the holding elements 15 in contact with the spring ring 21.
  • the holding elements 15 At the front end, the holding elements 15 have inwardly directed projections 23 which rest in the groove 13 on the firing pin 12 when the rotary hammer 1 is operated.
  • hook-like extensions 25 directed toward the groove 24 of the racket 6 are attached.
  • Radially arranged, prestressed springs 27 each act on the rear sections 26 of the individual holding elements 15 from the outside.
  • the springs 27 are guided in bushings 28 which pass through the guide tube 8 and rest on a projection of the control ring 30 which is tapered in the inner diameter.
  • This projection consists of teeth 29 running in the axial direction of the striking mechanism.
  • the diameter of the spring 27 is larger than the tooth spacing of the teeth 29.
  • the control ring 30 has on its inside a further toothing 31 which is in engagement with an external toothing 32 of the guide tube 8.
  • the contact surface 33 of the control ring 30 adjoins the external toothing 32. Between this and the toothing 29 there is a bevel 34.
  • the control ring 30 On the circumference, the control ring 30 carries an annular groove 35 into which an eccentrically arranged pin 36 of an actuating button 37 engages.
  • On the front of the control ring 30 there is a further set of teeth 38 on the outside which can be inserted into a set of teeth 40 which is firmly connected to the housing tube 39.
  • gearwheel 41 which is in gear connection with the motor, not shown, and has teeth 42 corresponding to the teeth 29 for the rotary operation.
  • FIG. 1 shows the pure impact operation.
  • the collar 30 must stand so that the springs 27 abut the teeth 29.
  • the firing pin must be pushed far enough (by pressing the hammer against the rock) so that the middle parts 16 of the holding elements 15 rest against its thickening 14 and the projections 23 can slide in the groove 13.
  • the rotary drive is switched off because the teeth 29 are not in engagement with the toothing 42.
  • the rotary drive can be switched on by turning the actuating button 37, which causes the toothing 29 to partially engage in the toothing 42 without the springs 27 already coming into the region of the bevel 34 of the adjusting ring 30.
  • the bevel 34 slides over the springs 37 and presses them radially inwards. In the end position, they rest on the contact surface 33 of the adjusting ring 30.
  • the holding elements 15 tilt with their extensions 25 inwards, engage in the groove 24 of the racket 6 and hold it. If the striker 6 is not yet in the sphere of influence of the holding elements at this point, it can press it back slightly against the force of the springs 27 with its beveled tip during its forward movement. Then the holding elements immediately close again and hold the racket 6 firmly.
  • the holding elements 15 are not only used for impact shutdown, but also serve for active idle control. As soon as the firing pin 12 is hit far enough due to the lack of back pressure through the rock, the projections 23 on the thickening 14 and the central parts 16 on the bevel 14 'come to rest. The spring washer 21 and, if necessary, the spring 27 then to be preloaded push the section 26 with the extensions 25 inwards and the racket is caught.
  • FIG. 2 shows a somewhat simpler example of a shock switch-off device without a rotation stop.
  • the racket 6 'with groove 24' is in the pot piston 7 ', which is surrounded by the guide tube 8' with collar 9 'and teeth 10'. The latter engages in a partially in a thickening 50 of a firing pin 12 'teeth 11' attached.
  • the bat 6 'facing end piece 51 of the firing pin 12' is tapered.
  • the holding elements 15 ' have inwardly radially projecting contact surfaces 52 and tapered holding arms 53 with hook-like extensions 25'.
  • the holding elements 15' are damped by a damping element 18 'on which the projections 20' rest.
  • the holding arms 53 of the holding elements 15 ' are springs 27', which are held in openings 54 of the guide tube 8 'with a flanged edge.
  • a sliding block 55 is inserted from the outside, the head 56 of which rests on the contact surface 57 of the control ring 30'.
  • a chamfer 58 and a further recessed contact surface 59 adjoin this contact surface 57.
  • the control ring 30 ' carries an annular groove 35' into which an eccentrically arranged pin 36 'of an actuating button 37' engages.
  • the control ring 30 ' is in Figure 2 in the "impact stop" position, i.e. he presses with his contact surface 57 against the sliding block 55 and the spring 27 '. Characterized the holding elements 15 are tilted inwards and the extensions 25 'engage in the groove 24' of the racket 6 ', engage behind a collar 61 at the front end of the racket 6' and thereby hold it firmly.
  • the springs 27 ' allow here, as in the previous example, a subsequent latching of the racket 6' in the already closed holding elements 15 '.
  • the percussion piston 12 actively controls the idling of the hammer drill 1.
  • the holding elements 15 tilt with the rear edge 60 onto the thinner end piece 51 and come into the catch position.
  • the holding elements 15 are tilted back.
  • pot pistons 7, 7 'or cylinder pistons can alternatively be used.
  • a correspondingly shaped tool shank, intermediate striker or the like can directly take over the control.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

Un marteau à percussion comprend un outil à percussion qui peut être arrêté de l'extérieur en actionnant des éléments de retenue (15, 15') à l'aide de dispositifs interrupteurs (27, 30, 37, 27', 30', 37'). Les éléments de retenue (15, 15') peuvent retenir le frappeur (6, 6') avec des extensions en crochet (25, 25'). Le dispositif d'arrêt peut également être utilisé comme une commande de marche à vide si le percuteur (12, 12') ou une autre partie mobile correspondante de l'outil à percussion (2) est formée en conséquence. Le dispositif d'arrêt d'outils à percussion a une conception simple, une construction compacte et de faibles coûts de production.

Claims (5)

1. Perceuse à percussion comportant un mécanisme de percussion pneumatique susceptible d'être coupé et un dispositif d'accrochage qui maintient le percuteur en marche à vide avec au moins un élément de retenue en forme de crochet, perceuse caractérisée en ce que les éléments de retenue (15, 15′) ou leurs prolongements (25, 25′) en forme de crochets peuvent être actionnés sélectivement à l'aide de moyens de commutation actionnés de l'extérieur de façon que soit les éléments de retenue (15, 15′) ou les prolongements (25, 25′) maintiennent ou libèrent le percuteur dans la position d'arrêt par prise dans les rainures (24, 24′) ou des retours du percuteur (6, 6′).
2. Perceuse à percussion selon la revendication 1, caractérisée en ce que les moyens de commutation se composent principalement d'éléments de transmission comme par exemple des ressorts (27) appliqués contre les éléments de retenue (15) et une bague de commande (30, 30′) agissant sur ces éléments et les maintenant dans deux positions, cette bague pouvant être actionnée par un bouton de manoeuvre (37).
3. Perceuse à percussion selon l'une des revendications 1 ou 2, caractérisée en ce que les éléments de retenue (15, 15′) sont montés en souplesse par l'intermédiaire d'éléments d'amortissement (18, 18′) ou moyens analogues pour ne pas transmettre directement au tube de guidage (8, 8′) un choc de mouvement de recul du percuteur (6, 6′) en position d'accrochage sur les éléments de retenue (15, 15′).
4. Perceuse à percussion selon l'une des revendications précédentes, caractérisée en ce que lorsqu'on soulève la perceuse à percussion par rapport au matériau, les éléments de retenue (15, 15′) peuvent être mis en outre en position d'accrochage en marche à vide par un goujon de percuteur (12, 12′), un axe d'outil et un élément intermédiaire ou un manchon de commutation qui comportent un renforcement (14, 50) dans la zone des éléments de retenue (15, 15′).
5. Perceuse à percussion selon l'une des revendications précédentes, caractérisée en ce que la bague de commande (30, 30′) peut être mise en différentes positions permettant soit la percussion seule, soit la rotation, soit la percussion et la rotation, soit la percussion avec un support d'outil fixe.
EP19870904493 1986-08-16 1987-07-10 Dispositif d'arret d'outils a percussion Expired - Lifetime EP0318480B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3627869 1986-08-16
DE19863627869 DE3627869A1 (de) 1986-08-16 1986-08-16 Schlagwerkabschaltung

Publications (2)

Publication Number Publication Date
EP0318480A1 EP0318480A1 (fr) 1989-06-07
EP0318480B1 true EP0318480B1 (fr) 1991-03-27

Family

ID=6307564

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870904493 Expired - Lifetime EP0318480B1 (fr) 1986-08-16 1987-07-10 Dispositif d'arret d'outils a percussion

Country Status (5)

Country Link
EP (1) EP0318480B1 (fr)
JP (1) JP2550124B2 (fr)
KR (1) KR880701617A (fr)
DE (2) DE3627869A1 (fr)
WO (1) WO1988001219A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1726407A3 (fr) * 2005-05-26 2008-10-22 Matsushita Electric Works, Ltd. Perforateur

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3629141A1 (de) * 1986-08-27 1988-03-10 Licentia Gmbh Einrichtung zum festlegen der bohrspindel bei einem handgefuehrten drehschlagbohrgeraet
DE4038395A1 (de) * 1990-12-01 1992-06-04 Hilti Ag Bohr- und meisselgeraet
DE4133236A1 (de) * 1991-10-05 1993-04-08 Bosch Gmbh Robert Bohrhammer mit fettschmierung
DE4135240A1 (de) * 1991-10-25 1993-04-29 Bosch Gmbh Robert Bohrhammer
DE4205840C2 (de) * 1992-02-26 1996-10-24 Kress Elektrik Gmbh & Co Bohrhammer mit Meißelfunktion
DE4305967C2 (de) * 1993-02-26 1997-03-06 Kress Elektrik Gmbh & Co Schaltvorrichtung zur Spindelarretierung für Elektrowerkzeuge
DE4305965C2 (de) * 1993-02-26 1997-08-21 Kress Elektrik Gmbh & Co Schaltvorrichtung zur Spindelarretierung für Elektrowerkzeuge
DE10034768A1 (de) * 2000-07-18 2002-02-07 Bosch Gmbh Robert Elektrokombihammer
CN1301185C (zh) * 2004-04-26 2007-02-21 苏州宝时得电动工具有限公司 电锤的储能冲击机构
DE102004052329A1 (de) * 2004-10-27 2006-05-04 Kress-Elektrik Gmbh & Co. Elektromotorenfabrik Synchronisations- und Schalteinheit für Einknopf-Wahlschalter sowie Elektrowerkzeug mit Synchronisations- und Schalteinheit
DE102007000135A1 (de) * 2007-03-08 2008-09-11 Hilti Ag Handwerkzeugmaschine mit pneumatischem Schlagwerk
US7861799B2 (en) * 2008-03-21 2011-01-04 Makita Corporation Impact tool
DE102010062099A1 (de) * 2010-11-29 2012-05-31 Robert Bosch Gmbh Hammerschlagwerk
WO2019079560A1 (fr) 2017-10-20 2019-04-25 Milwaukee Electric Tool Corporation Outil à percussion
WO2019147919A1 (fr) 2018-01-26 2019-08-01 Milwaukee Electric Tool Corporation Outil à percussion

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3624153A1 (de) * 1986-07-17 1988-01-28 Bosch Gmbh Robert Motorbetriebener hammer

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH636796A5 (en) * 1979-01-25 1983-06-30 Duss Friedrich Maschf Electropneumatic hammer with a catch ring for the percussion piston
DE3120326A1 (de) * 1980-10-21 1982-05-27 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer
DE3039669A1 (de) * 1980-10-21 1982-05-27 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer
DE3307521A1 (de) * 1983-03-03 1984-09-06 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3624153A1 (de) * 1986-07-17 1988-01-28 Bosch Gmbh Robert Motorbetriebener hammer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1726407A3 (fr) * 2005-05-26 2008-10-22 Matsushita Electric Works, Ltd. Perforateur

Also Published As

Publication number Publication date
DE3768961D1 (de) 1991-05-02
JPH01503613A (ja) 1989-12-07
EP0318480A1 (fr) 1989-06-07
WO1988001219A1 (fr) 1988-02-25
KR880701617A (ko) 1988-11-04
JP2550124B2 (ja) 1996-11-06
DE3627869A1 (de) 1988-02-18

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