EP3083155A1 - Machine-outil à main - Google Patents

Machine-outil à main

Info

Publication number
EP3083155A1
EP3083155A1 EP14812196.5A EP14812196A EP3083155A1 EP 3083155 A1 EP3083155 A1 EP 3083155A1 EP 14812196 A EP14812196 A EP 14812196A EP 3083155 A1 EP3083155 A1 EP 3083155A1
Authority
EP
European Patent Office
Prior art keywords
striker
section
working axis
striker section
hand tool
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
Application number
EP14812196.5A
Other languages
German (de)
English (en)
Other versions
EP3083155B1 (fr
Inventor
Aaron Wiedner
Thomas Hofbrucker
Eduard Pfeiffer
Markus Hartmann
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
Priority to EP14812196.5A priority Critical patent/EP3083155B1/fr
Publication of EP3083155A1 publication Critical patent/EP3083155A1/fr
Application granted granted Critical
Publication of EP3083155B1 publication Critical patent/EP3083155B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/24—Damping the reaction force
    • 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
    • B25D17/24—Damping the reaction force
    • B25D17/245—Damping the reaction force using a fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0015—Anvils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0019—Guide-sleeves
    • 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
    • B25D2250/225—Serrations

Definitions

  • the present invention relates to a hand tool, as known from DE 10323606 A1.
  • the hand tool of the invention has a tool holder for receiving a tool on a working axis and an electric motor.
  • a pneumatic percussion mechanism has an exciter moved forward and backward by the motor periodically parallel to the working axis, a striker movable on the working axis, which is coupled to the exciter via an air spring, and a striker movably arranged on the working axis, which strikes in the direction of impact Racket is arranged.
  • the striker has a cylindrical striker section of a diameter and in the striker section a plurality of grooves extending over the entire length of the striker section. A cross-sectional area of the striker section is at most 5% less than a circular area defined by the diameter.
  • the cross-sectional area of the striker section is at least 1.0% less than the circular area.
  • the grooves allow a small and defined air exchange, which slows down the striker in case of a blank.
  • a guide sleeve has a cylindrical guide portion in which the cylindrical striker section is guided. An inner diameter of the guide portion is equal to the diameter of the beatpiece portion. The cylindrical inner surface of the guide section is smooth and unstructured.
  • FIG. 1 shows a hammer drill
  • Fig. 2 shows a striker in a guide sleeve
  • Fig. 3 is a cross section in the plane III-III
  • Fig. 1 shows an example of a chiseling hand tool machine schematically a hammer drill l.
  • the hammer drill l has a tool holder 2 into which a shank end 3 of a tool, e.g. one of the drill 4, can be used.
  • a primary drive of the hammer drill 1 is a motor 5, which drives a striking mechanism 6 and an output shaft 7.
  • a battery pack 8 or a power line supplies the motor 5 with power.
  • a user can lead the hammer drill 1 by means of a handle 9 and take the hammer drill l by means of a system switch 10 in operation.
  • the hammer drill l rotates the drill 4 continuously about a working axis 11 and can beat the drill 4 in the direction of impact 12 along the working axis 11 in a substrate.
  • the Schlagtechnik e is a pneumatic striking mechanism e.
  • An excitation piston 13 and a racket 14 are guided in a guide tube 15 in the hammer mechanism 6 along the working axis 11 movable.
  • the excitation piston 13 is coupled via an eccentric 16 to the motor 5 and forced to a periodic, linear movement.
  • a connecting rod 17 connects the eccentric 16 with the excitation piston 13.
  • An air spring formed by a pneumatic chamber 18 between the excitation piston 13 and the racket 14 couples a movement of the racket 14 to the movement of the exciter piston 13.
  • the bat 14 strikes a striker 19, which forwards the blow to the drill 4.
  • the striking mechanism 6 and preferably the further drive components are arranged within a machine housing 20.
  • the striker 19 has three successive portions 21, 22 in the direction of impact 12.
  • the three striker portions 21, 22, 23 are substantially cylindrical.
  • the front, first portion 21 forms a shock absorbing face 24 on which the racket 14 strikes.
  • the rear, third section 23 forms the impact-releasing striking surface 25, which transmits the impact to the drill 4.
  • the rear portion 23 is the longest three sections and serves for the axial guidance of the striker 19.
  • the second and middle Section 22 also serves the axial guidance of the striker 19.
  • the striker 19 is movable along the working axis 11 and in the radial direction by the two sections 22, 23 inhibited.
  • the diameter 26 of the middle section 22 is greater than the diameters 27 of the front and rear sections 21, 23.
  • the middle section 22 is adjoined on both sides by two conical sections 28, which merge into the front and rear sections 21, 23.
  • the knurling produces a plurality of, eg, more than 20, identical grooves 30.
  • the grooves 30 are exemplary parallel to the working axis 11.
  • FIG. 3 shows a depth and width of the grooves 30 are oversubscribed The depth is preferably in the range of 0.25% to 2.5% of the diameter 26 of the portion 22.
  • the width of the grooves 30 may be approximately equal to the depth of the grooves 30.
  • the number of grooves 30 and their dimensions reduce the cross-sectional area of the central portion 22 relative to the corresponding untrimmed solid cylinder.
  • the cross-sectional area is at most 5% and preferably at least 1.0% less than a circular area whose diameter is equal to the diameter of the middle section 22.
  • Each of the grooves 30 extends over the entire length 31 of the central portion 22, that is, the grooves 30 begin and end at the conical portions 28.
  • the striker 19 is guided by a guide sleeve 32 strictly coaxial with the working axis 11.
  • the guide sleeve 32 is made as usual with a radial clearance of 10 ⁇ , so that the striker 19 can slide in the guide sleeve 32.
  • the guide sleeve 32 abuts in the radial direction on the central striker section 22 and the third section 23.
  • the guide sleeve 32 has a first guide portion 33 and following in the direction of impact 12 a second guide portion 34.
  • the first guide portion 33 guides the central striker section 22, accordingly, the inner diameter of the first guide portion 33 is equal to the diameter 26 of the central striker section 22.
  • the second guide section 34 leads the third striker section 23 and has an inner diameter equal to the smaller diameter 27 of the third striker section 23.
  • the first striker section 21 is unguided.
  • the inner surfaces of the guide sleeve 32, in particular of the two guide portions 33, 34 are smooth without introduced structures, such as grooves, grooves, holes etc ..
  • a funnel-shaped surface 35 connects the first guide portion 33 with the second guide portion 34.
  • the funnel-shaped surface 35 is used for Anvil 19 as a stop in the direction of impact 12.
  • the funnel-shaped surface 35 is preferably complementary to the direction of impact 12 facing conical portion 28 of the striker 19 is formed.
  • the striker 19 has a further stop 36 against which the striker 19 abuts against the direction of impact 12 in its basic position.
  • the striker 19 and the guide 32 close off an air chamber 35.
  • the grooves 30 in the anvil 19 form the only channel through which air can enter the air chamber 35 and escape from the air chamber 35.
  • a displacement rate of the air displaced by the fast-flying beatpiece 19 is higher than the exit rate of the air from the air chamber 35 through the channel-forming grooves 30.
  • the increasing pressure in the air chamber brakes the striker 19. As soon as the striker 19 has clearly lost speed, the exit rate exceeds the displacement rate. The pressure drops.
  • the striker 19 is braked in the direction of impact 12, but not moved by the air against the direction of impact 12.
  • the guide sleeve 32 can be suspended in the machine housing 20 in the direction of impact 12 movable.
  • a gap 37 separates an end face of the guide sleeve 32 facing the impact direction 12 from the machine housing 20.
  • a damping element 38 e.g. a rubber ring biases the guide sleeve 32 against the direction of impact 12. In a collision of the striker 19 to the funnel-shaped surface 35, the guide sleeve 32 is deflected against the damping element 38 in the direction of impact.

Landscapes

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

Abstract

L'invention concerne une machine-outil à main comportant un porte-outil destiné à recevoir un outil sur un axe de travail (11) et un moteur électrique (5). Un mécanisme de percussion pneumatique (6) comporte un excitateur déplacé périodiquement suivant un mouvement alternatif par le moteur (5) parallèlement à l'axe de travail (11), un percuteur (14) mobile sur l'axe de travail (11) et accouplé à l'excitateur par le biais d'un ressort pneumatique (18), et une bouterolle (19) disposée de manière mobile sur l'axe de travail (11) et agencée en arrière du percuteur par référence à la direction de percussion (12). La bouterolle (19) possède un segment cylindrique (22) d'un certain diamètre et, dans le segment (22), une pluralité de rainures (30) s'étendant sur toute la longueur (31) du segment (22). L'aire de section transversale du segment (22) est au maximum inférieure de 5% à une aire circulaire définie par le diamètre.
EP14812196.5A 2013-12-18 2014-12-09 Machine-outil manuelle Active EP3083155B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14812196.5A EP3083155B1 (fr) 2013-12-18 2014-12-09 Machine-outil manuelle

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP13197954.4A EP2886261A1 (fr) 2013-12-18 2013-12-18 Machine-outil manuelle
PCT/EP2014/077058 WO2015091112A1 (fr) 2013-12-18 2014-12-09 Machine-outil à main
EP14812196.5A EP3083155B1 (fr) 2013-12-18 2014-12-09 Machine-outil manuelle

Publications (2)

Publication Number Publication Date
EP3083155A1 true EP3083155A1 (fr) 2016-10-26
EP3083155B1 EP3083155B1 (fr) 2020-04-01

Family

ID=49816868

Family Applications (2)

Application Number Title Priority Date Filing Date
EP13197954.4A Withdrawn EP2886261A1 (fr) 2013-12-18 2013-12-18 Machine-outil manuelle
EP14812196.5A Active EP3083155B1 (fr) 2013-12-18 2014-12-09 Machine-outil manuelle

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP13197954.4A Withdrawn EP2886261A1 (fr) 2013-12-18 2013-12-18 Machine-outil manuelle

Country Status (4)

Country Link
US (1) US10391621B2 (fr)
EP (2) EP2886261A1 (fr)
CN (1) CN105829029A (fr)
WO (1) WO2015091112A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3181298A1 (fr) * 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Machine-outil a percussion
WO2020150622A1 (fr) * 2019-01-17 2020-07-23 Carlson Donald W Système de marteau de sécurité motorisé à plusieurs courses
EP3782766A1 (fr) * 2019-08-19 2021-02-24 Hilti Aktiengesellschaft Machine-outil manuelle
JP7388873B2 (ja) * 2019-10-21 2023-11-29 株式会社マキタ 打撃工具
US11529727B2 (en) * 2019-10-21 2022-12-20 Makita Corporation Power tool having hammer mechanism
EP3822037A1 (fr) * 2019-11-15 2021-05-19 Hilti Aktiengesellschaft Agencement de mécanisme de percussion
EP3960379A1 (fr) * 2020-08-31 2022-03-02 Hilti Aktiengesellschaft Machine-outil portative
CN220903221U (zh) * 2021-05-21 2024-05-07 米沃奇电动工具公司 动力工具
CN116175491B (zh) * 2023-03-15 2025-06-24 江苏东成工具科技有限公司 电动工具

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE679558C (de) * 1934-06-27 1939-08-09 Siemens Schuckertwerke Akt Ges Motorisches, ortsbewegliches Schlagwerkzeug
DE1628045B2 (de) * 1967-01-13 1974-01-10 Robert Bosch Gmbh, 7000 Stuttgart Hammergerät mit einem quer zur Schlagrichtung eingebauten Antriebsmotor
DE3224176C2 (de) * 1982-06-29 1995-02-02 Bosch Gmbh Robert Motorisch angetriebene schlagende Handwerkzeugmaschine
FR2531138A1 (fr) * 1982-07-29 1984-02-03 Inst Avtomatiki Akademii Dispositif de percussion notamment pour machine hydraulique de forage de puits
DE3304916A1 (de) * 1983-02-12 1984-08-16 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer
CH654513A5 (fr) * 1983-11-04 1986-02-28 Arx Ag Appareil a percussion.
US4582144A (en) * 1984-04-25 1986-04-15 Makita Electric Works, Ltd. Percussive tools
JP3369844B2 (ja) * 1996-05-15 2003-01-20 リョービ株式会社 空打ち防止機構を有する回転打撃工具
DE19626254A1 (de) * 1996-06-29 1998-01-08 Bosch Gmbh Robert Elektrohandwerkzeugmaschine
DE10103141A1 (de) * 2001-01-24 2002-07-25 Hilti Ag Elektrohandwerkzeuggerät mit Leerschlagabschaltung
US7032683B2 (en) * 2001-09-17 2006-04-25 Milwaukee Electric Tool Corporation Rotary hammer
DE10230991A1 (de) * 2002-07-10 2004-02-12 Robert Bosch Gmbh Werkzeugaufnahme für eine Werkzeugmaschine
DE10362025B4 (de) * 2003-05-20 2006-02-09 Robert Bosch Gmbh Bohr- oder Schlaghammer
DE10323606B4 (de) 2003-05-20 2005-04-14 Robert Bosch Gmbh Elastische Döpperführung
DE102005035099A1 (de) * 2005-07-27 2007-02-01 Robert Bosch Gmbh Schlagwerk und wenigstens schlagend antreibbare Handwerkzeugmaschine mit einem Schlagwerk
DE102009026542A1 (de) * 2009-05-28 2010-12-09 Hilti Aktiengesellschaft Werkzeugmaschine
DE102009045656A1 (de) * 2009-10-14 2011-04-21 Robert Bosch Gmbh Werkzeugvorrichtung
DE102010029915A1 (de) * 2010-06-10 2011-12-15 Hilti Aktiengesellschaft Werkzeugmaschine und Steuerungsverfahren
DE102010029918A1 (de) * 2010-06-10 2011-12-15 Hilti Aktiengesellschaft Werkzeugmaschine
DE102010043810A1 (de) * 2010-11-12 2012-05-16 Hilti Aktiengesellschaft Handwerkzeugmaschine

Also Published As

Publication number Publication date
US10391621B2 (en) 2019-08-27
WO2015091112A1 (fr) 2015-06-25
EP3083155B1 (fr) 2020-04-01
EP2886261A1 (fr) 2015-06-24
CN105829029A (zh) 2016-08-03
US20160311103A1 (en) 2016-10-27

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