EP0221009B1 - Perceuse à percussion avec interruption de la rotation - Google Patents

Perceuse à percussion avec interruption de la rotation Download PDF

Info

Publication number
EP0221009B1
EP0221009B1 EP86810315A EP86810315A EP0221009B1 EP 0221009 B1 EP0221009 B1 EP 0221009B1 EP 86810315 A EP86810315 A EP 86810315A EP 86810315 A EP86810315 A EP 86810315A EP 0221009 B1 EP0221009 B1 EP 0221009B1
Authority
EP
European Patent Office
Prior art keywords
coupling sleeve
guide tube
control cam
displacement
switching member
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
EP86810315A
Other languages
German (de)
English (en)
Other versions
EP0221009A2 (fr
EP0221009A3 (en
Inventor
Anton Neumaier
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP0221009A2 publication Critical patent/EP0221009A2/fr
Publication of EP0221009A3 publication Critical patent/EP0221009A3/de
Application granted granted Critical
Publication of EP0221009B1 publication Critical patent/EP0221009B1/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
    • B25D16/006—Mode changers; Mechanisms connected thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/003—Crossed drill and motor spindles
    • 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
    • B25D2216/0046—Preventing rotation

Definitions

  • the invention relates to a hammer drill with electropneumatic percussion mechanism, which has a guide tube that transmits a rotary movement to a tool, wherein a rotatable and axially immovable gearwheel that is constantly in engagement with the drive wheel is arranged on the guide tube, and a gearwheel that is non-rotatably connected to the guide tube by means of a housing-side switching member axially displaceable coupling sleeve can be engaged and disengaged with the gearwheel, the switching member being rotatable about an axis normal to the shifting direction of the coupling sleeve and displaceable normally to the shifting direction of the coupling sleeve and a pin designed as an eccentric bearing, in a along the circumference of the Coupling sleeve extending groove engaging control cam.
  • rotary hammers are often also used for chiseling.
  • the rotary movement is switched off and the tool is only given axially directed blows.
  • To prevent the tool from being turned unintentionally it is known to lock the guide cylinder in a certain rotational position.
  • a rotation lock of the guide tube is also advantageous for changing the tool.
  • a hammer drill known from DE-A 2 316 722 has, for the aforementioned reasons, a coupling sleeve which is axially displaceable on the guide tube and which is connected in a rotationally fixed manner to the guide tube.
  • the coupling sleeve is partially designed as a polygon on its outside.
  • the switching element cooperating with the coupling sleeve has the shape of an eccentric shaft and serves on the one hand to axially move the coupling sleeve and on the other hand to lock the coupling sleeve against rotation by contacting one of the key surfaces of the polygon.
  • the lockable rotary positions possible with this version are limited by the shape of the polygon of the coupling sleeve.
  • a rotary hammer with a bevel gear rotatably mounted on the guide tube is known, which is in constant engagement with a bevel pinion.
  • a coupling sleeve is also axially displaceable and non-rotatably arranged on the guide tube.
  • the coupling sleeve can be coupled to the bevel gear. In this position, the rotational movement is transmitted from the bevel gear via the coupling sleeve to the guide tube.
  • the coupling sleeve is displaced by means of a switching element which can be rotated about an axis which runs normally to the direction of displacement of the coupling sleeve.
  • the switching element has a control cam designed as an eccentrically mounted pin which engages in a groove on the circumference of the coupling sleeve.
  • the coupling sleeve In a middle position of the switching element, the coupling sleeve is not in engagement with the bevel gear, so that the guide tube can be freely rotated. To prevent rotation, the coupling sleeve comes into engagement with a fixed locking ring in a further position of the switching element.
  • complex coupling claws are provided on the coupling sleeve and on the locking ring.
  • FR-A-2 218 972 shows a rotary hammer with a rotary movement that can be switched off.
  • a coupling sleeve which can be axially displaced by means of a switching element is likewise arranged on the guide tube. By axially shifting the coupling sleeve, it can be connected to a bevel gear and thus the rotational movement can be initiated on the guide tube.
  • a rotation lock of the guide tube is not provided.
  • the invention has for its object to provide a hammer drill with a switching element which on the one hand gives an optical indication of its operating position and on the other hand enables a simple and compact solution for locking the guide tube.
  • control cam of the switching element can be inserted into a latching opening at the base of the groove of the coupling sleeve.
  • the control cam which can be inserted into the latching openings at the base of the groove, provides a positive connection between the coupling sleeve and the switching element. This prevents an inadequate locking due to wear and tear and ensures the absorption of high forces.
  • the division of the locking openings can be freely chosen according to needs.
  • the control cam thus has two functions. In a first phase, the control cam only engages in the groove and moves the coupling sleeve in the axial direction. In a second phase, the control cam can move radially into the latching opening at the bottom of the groove and thus forms the rotational lock of the coupling sleeve.
  • the drill hammer shown in FIGS. 1 to 4 has a housing designated overall by 1.
  • the housing 1 is connected to a handle 2.
  • a feed line 3 opens into the handle 2.
  • a pusher 4 is used to switch the hammer on and off.
  • a tool holder 5 can be seen at the end of the housing 1 opposite the handle.
  • a motor pinion 6 is in mesh with a spur gear 7.
  • the spur gear 7 is rotatably connected to a bevel pinion 8.
  • the bevel pinion 8 is over a ball bearing 9 and a bearing bush 10 are mounted in the housing 1.
  • the motor pinion 6 is also in engagement with a spur gear 11.
  • the spur gear 11 is connected to a crankshaft, generally designated 12.
  • the crankshaft 12 is also mounted in the housing 1 via a ball bearing 13 and a bearing bush 14.
  • a guide tube, denoted overall by 15, is mounted in the housing 1 via a radial bearing 16.
  • An excitation piston 17 is slidably guided in the guide tube 15.
  • the excitation piston 17 is connected to a crank pin 12a of the crankshaft 12 via a piston pin 18 and a connecting rod 19.
  • the excitation piston 17 also has a sealing ring 20.
  • a bevel gear, indicated overall by 22, is rotatably supported by a needle bearing 21.
  • the bevel gear 22 is in constant engagement with the bevel pinion 8.
  • the bevel gear 22 is supported on the guide tube 15 in the axial direction via an axial bearing 23.
  • the guide tube 15 has a spline 15a, on which a coupling sleeve, designated overall by 24, is arranged to be axially displaceable.
  • the coupling sleeve 24 has claws 24a which can be brought into engagement with a toothing 22a of the bevel gear 22 and is also provided with a circumferential groove 24b and locking openings 24c arranged at the base of this groove 24b and extending in the radial direction.
  • a switching element, generally designated 25 is rotatably mounted normally to the direction of displacement of the coupling sleeve 24.
  • the switching element 25 has a control cam 25a projecting into the groove 24b and is pushed in the direction of the guide tube 15 by means of a compression spring 26.
  • the switching element 25 is connected to an actuating element, designated overall by 27.
  • the connection of the actuating member 27 to the switching member 25 takes place via a polygon 25b and a screw 28.
  • the actuating member 27 has a projection 27a which, depending on the rotational position of the switching member 25, engages with a locking groove 1a or a recess 1b on the housing 1.
  • the coupling sleeve 24 is displaced in the direction of the radial bearing 16.
  • the claws 24a of the coupling sleeve 24 come out of engagement with corresponding counterclaws on the bevel gear 22.
  • the transmission of the rotary movement is thus interrupted.
  • the projection 27a can engage in the recess 1b which is deeper than the locking groove 1a.
  • the control cam 25a on the switching element 25 can also engage in one of the latching openings 24c.
  • the guide tube 15 is thus locked via the coupling sleeve 24.
  • the top view of the housing 1 shown in FIG. 3 shows, with the omission of the actuating member 27, the diametrically opposite latching groove 1a and the recess 1b.
  • Fig. 4 shows the engagement of the projection 27a in the recess 1b.
  • the actuator 27 When the actuator 27 is rotated, it is raised by the oblique flanks on the projection 27a and the recess 1b and the projection 27a is thus disengaged from the recess 1b.

Claims (2)

  1. Marteau perforateur avec mécanisme de percussion électropneumatique, comprenant un tube de guidage (15) transmettant un mouvement de rotation à un outil, une roue dentée (22) tournante et axialement immobile qui est en prise permanente avec une roue de commande (a) étant montée sur le tube de guidage (15) et un manchon d'accouplement (24) solidaire en rotation avec le tube de guidage (15) et déplaçable axialement au moyen d'un organe de commutation (2S) monté du côté du boîtier pouvant être accouplé et désaccouplé avec ladite roue dentée (22), l'organe de commutation (25) pouvant tourner autour d'un axe orienté perpendiculairement à la direction de déplacement du manchon d'accouplement (24) et être déplacé perpendiculairement à la direction de déplacement du manchon d'accouplement (24) et comprenant une came radiale (25a) conformée en tourillon excentrique et s'engageant dans une rainure (24b) qui s'étend le long de la périphérie du manchon d'accouplement (24), caractérisé en ce que la came radiale (25a) de l'organe de commutation (25) peut être engagée dans une ouverture d'arrêt (24c) au fond de la rainure (24b) du manchon d'accouplement (24).
  2. Marteau perforateur selon la revendication 1, caractérisé en ce que, pour le déplacement de la came radiale (25a) perpendiculairement à la direction de déplacement du manchon d'accouplement (24), des saillies (27a) et des évidements (1b) sont prévus sur l'organe de commutation (25) et le boîtier (1) et peuvent être mis en prise les uns avec les autres a l'état désaccouplé.
EP86810315A 1985-10-26 1986-07-15 Perceuse à percussion avec interruption de la rotation Expired - Lifetime EP0221009B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853538166 DE3538166A1 (de) 1985-10-26 1985-10-26 Bohrhammer mit dreharretierung
DE3538166 1985-10-26

Publications (3)

Publication Number Publication Date
EP0221009A2 EP0221009A2 (fr) 1987-05-06
EP0221009A3 EP0221009A3 (en) 1987-12-16
EP0221009B1 true EP0221009B1 (fr) 1991-03-06

Family

ID=6284558

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86810315A Expired - Lifetime EP0221009B1 (fr) 1985-10-26 1986-07-15 Perceuse à percussion avec interruption de la rotation

Country Status (3)

Country Link
US (1) US4763733A (fr)
EP (1) EP0221009B1 (fr)
DE (2) DE3538166A1 (fr)

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DE3819125A1 (de) * 1988-06-04 1989-12-14 Bosch Gmbh Robert Bohrhammer
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DE10033100A1 (de) * 2000-07-07 2002-01-17 Hilti Ag Kombiniertes Elektrohandwerkzeuggerät
DE10111748A1 (de) * 2001-03-12 2002-09-19 Hilti Ag Schaltwerk für ein kombiniertes Handwerkzeuggerät
DE10205030A1 (de) * 2002-02-07 2003-08-21 Hilti Ag Betriebsmodi-Schalteinheit einer Handwerkzeugmaschine
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CN201201225Y (zh) * 2008-05-20 2009-03-04 东莞群胜粉末冶金有限公司 冲击钻的冲击切换装置
DE102008054786A1 (de) * 2008-12-17 2010-07-01 Hilti Aktiengesellschaft Drehschalter
DE102009028633A1 (de) * 2009-08-19 2011-02-24 Robert Bosch Gmbh Vorrichtung für eine Handwerkzeugmaschine und Handwerkzeugmaschine
DE102010041259A1 (de) * 2010-09-23 2012-03-29 Robert Bosch Gmbh Handwerkzeugmaschinenschaltvorrichtung
CN102248520B (zh) * 2011-06-14 2013-07-10 常熟市迅达粉末冶金有限公司 一种功能切换装置
DE102012208913A1 (de) 2012-05-25 2013-11-28 Robert Bosch Gmbh Schlagwerkeinheit
DE102012208902A1 (de) 2012-05-25 2013-11-28 Robert Bosch Gmbh Schlagwerkeinheit
DE102012209446A1 (de) * 2012-06-05 2013-12-05 Robert Bosch Gmbh Handwerkzeugmaschinenvorrichtung
US9630307B2 (en) 2012-08-22 2017-04-25 Milwaukee Electric Tool Corporation Rotary hammer
US9108312B2 (en) 2012-09-11 2015-08-18 Milwaukee Electric Tool Corporation Multi-stage transmission for a power tool
US9908228B2 (en) 2012-10-19 2018-03-06 Milwaukee Electric Tool Corporation Hammer drill
US9073182B2 (en) * 2012-10-31 2015-07-07 Mou-Tang Liou Screwing tool
US9573262B2 (en) * 2012-11-19 2017-02-21 Makita Corporation Impact tool
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CN108705490B (zh) * 2018-07-31 2023-12-29 浙江信普工贸有限公司 锤镐电动工具的锤档自锁装置
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Also Published As

Publication number Publication date
EP0221009A2 (fr) 1987-05-06
EP0221009A3 (en) 1987-12-16
DE3538166A1 (de) 1987-04-30
DE3677889D1 (de) 1991-04-11
US4763733A (en) 1988-08-16

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