EP3083155B1 - Machine-outil manuelle - Google Patents

Machine-outil manuelle Download PDF

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Publication number
EP3083155B1
EP3083155B1 EP14812196.5A EP14812196A EP3083155B1 EP 3083155 B1 EP3083155 B1 EP 3083155B1 EP 14812196 A EP14812196 A EP 14812196A EP 3083155 B1 EP3083155 B1 EP 3083155B1
Authority
EP
European Patent Office
Prior art keywords
anvil
striker
anvil portion
power tool
guide
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.)
Active
Application number
EP14812196.5A
Other languages
German (de)
English (en)
Other versions
EP3083155A1 (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

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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 machine tool, as from the DE 10323606 A1 known and described in the preamble of claim 1.
  • the hand tool according to the invention according to claim 1 has a tool holder for receiving a tool on a working axis and an electric motor.
  • a pneumatic striking mechanism has an exciter which is periodically moved back and forth by the motor 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 which is movably arranged on the working axis and which is arranged in the striking direction after the Racket is arranged.
  • the striker has a cylindrical striker section with a diameter and in the striker section several grooves extending over the entire length of the striker section. A cross-sectional area of the striking section is at most 5% smaller than a circular area defined by the diameter.
  • the cross-sectional area of the anvil section is preferably at least 1.0% smaller than the circular area.
  • the grooves enable a low and defined air exchange, which brakes the striker in the event of an empty stroke.
  • a guide sleeve has a cylindrical guide section in which the cylindrical striker section is guided. An inner diameter of the guide section is equal to the diameter of the striking section. The cylindrical inner surface of the guide section is smooth and unstructured.
  • Fig. 1 shows schematically a hammer drill 1 as an example of a chiseling hand machine tool .
  • the hammer drill 1 has a tool holder 2, into which a shaft end 3 of a tool, for example one of the drill 4, can be inserted.
  • a battery pack 8 or a power line supplies the motor 5 with current.
  • a user can guide the hammer drill 1 by means of a handle 9 and put the hammer drill 1 into operation by means of a system switch 10 .
  • the rotary hammer 1 continuously rotates the drill 4 about a working axis 11 and can strike the drill 4 in a direction of impact 12 along the working axis 11 in a subsurface.
  • the striking mechanism 6 is a pneumatic striking mechanism 6.
  • An excitation piston 13 and a striker 14 are movably guided in the guide tube 15 in the striking mechanism 6 along the working axis 11 .
  • the excitation piston 13 is coupled to the motor 5 via an eccentric 16 and is forced to perform a periodic, linear movement.
  • a connecting rod 17 connects the eccentric 16 to the exciter piston 13.
  • An air spring formed by a pneumatic chamber 18 between the exciter piston 13 and the striker 14 couples a movement of the striker 14 to the movement of the exciter piston 13 .
  • the striker 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 anvil 19 has three in the impact direction 12 consecutive portions 21, 22 23.
  • the three (Döpper-) sections 21, 22, 23 are substantially cylindrical.
  • the front, first section 21 forms a striking face 24, on which the striker 14 strikes.
  • the rear, third section 23 forms the impact-emitting impact surface 25, which transmits the impact to the drill 4 .
  • the rear section 23 is the longest three sections and serves to axially guide the striker 19.
  • the second and middle Section 22 also serves to axially guide the striker 19.
  • the striker 19 is movable along the working axis 11 and is inhibited in the radial direction by the two sections 22, 23 .
  • the diameter 26 of the central section 22 is larger than the diameter 27 of the front and rear sections 21, 23.
  • the central section 22 is adjoined on both sides by two conical sections 28 which merge into the front and rear sections 21, 23 .
  • the middle section 22 has a knurled lateral surface 29.
  • the knurling produces a plurality of, for example more than 20, identical grooves 30.
  • the grooves 30 are, for example, parallel to the working axis 11.
  • FIG. 4 shows an exaggerated depth and width of the grooves 30.
  • the depth is preferably in the range from 0.25% to 2.5% of the diameter 26 of the section 22.
  • the width of the grooves 30 can 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 section 22 compared to the corresponding un-knurled 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 central section 22 .
  • Each of the grooves 30 extends over the entire length 31 of the central section 22, ie the grooves 30 begin and end at the conical sections 28.
  • the anvil 19 is guided strictly coaxially to the working axis 11 by a guide sleeve 32 .
  • the guide sleeve 32 is manufactured with a radial clearance of 10 ⁇ m so that the striker 19 can slide in the guide sleeve 32 .
  • the guide sleeve 32 lies in the radial direction on the middle striking section 22 and the third section 23 .
  • the guide sleeve 32 has a first guide section 33 and, in the direction of impact 12, a second guide section 34.
  • the first guide section 33 guides the middle striker section 22, and accordingly the inside diameter of the first guide section 33 is equal to the diameter 26 of the middle striker section 22.
  • the second guide section 34 guides 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 sections 33, 34, are smooth without any structures, such as grooves, grooves, holes, etc. introduced therein.
  • a funnel-shaped surface 35 connects the first guide section 33 to the second guide section 34.
  • the funnel-shaped surface 35 serves for the anvil 19 as a stop 12 in the direction of impact, the funnel-shaped surface 35 is preferably formed complementary to the pointing in the direction of impact 12 conical portion 28 of the striker 19th
  • the striker 19 has a further stop 36, against which the striker 19 rests in the basic position against the striking direction 12 .
  • the striker 19 and the guide 32 close an air chamber 35 .
  • the grooves 30 in the anvil 19 constitute the single channel through which air in the air chamber 35 can enter and exit the air chamber 35th
  • the air is strongly compressed by the striker 19 when it flies in the direction of impact 12 due to a blow.
  • a displacement rate of the air displaced by the fast-flying striker 19 is higher than the exit rate of the air from the air chamber 35 through the grooves 30 forming the channel.
  • 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 is not moved against the direction of impact 12 by the air.
  • the guide sleeve 32 can be suspended in the machine housing 20 so that it can move in the direction of impact 12 .
  • a gap 37 separates an end face of the guide sleeve 32 pointing in the direction of impact 12 from the machine housing 20.
  • a damping element 38 for example a ring made of rubber, prestresses the guide sleeve 32 against the direction of impact 12 .
  • 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)

Claims (6)

  1. Machine-outil manuelle (1) équipée de :
    un logement d'outil destiné à recevoir un outil sur un axe de travail (10) ;
    un moteur électrique (5) ;
    un mécanisme de percussion pneumatique (6) qui un excitateur (13) qui est déplacé périodiquement d'avant en arrière par le moteur (5) parallèlement à l'axe de travail (10), un battant (14) qui est mobile sur l'axe de travail (11) et qui est couplé à l'excitateur via un ressort à air (18) et une bouterolle (19) qui est disposée de façon mobile sur l'axe de travail (11) et qui est disposée après le battant (14) dans la direction de percussion (11),
    une douille de guidage (32) qui présente une section de guidage (33) cylindrique, la bouterolle (19) comportant une section de bouterolle (22) cylindrique avec un diamètre et la section de bouterolle (22) cylindrique étant guidée dans la section de guidage (33) et un diamètre intérieur de la section de guidage (33) étant identique au diamètre de la section de bouterolle (22) ;
    caractérisée en ce que :
    la bouterolle (19) comporte dans la section de bouterolle (22) plusieurs rainures (30) s'étendant sur l'ensemble de la longueur (31) de la section de bouterolle (22) et une surface de section transversale de la section de bouterolle (22) étant réduite d'au plus 5 % par rapport à une surface circulaire définie par le diamètre (26).
  2. Machine-outil manuelle (1) selon la revendication 1, caractérisée en ce que la surface de section transversale de la section de bouterolle (22) est réduite d'au moins 1,0 % par rapport à la surface circulaire.
  3. Machine-outil manuelle (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que la bouterolle (19) comporte une section de bouterolle (23) cylindrique supplémentaire disposée après la section de bouterolle (22) dans la direction de percussion (12) et la douille de guidage (32) comportant une section de guidage (34) supplémentaire dans laquelle la section de bouterolle (23) supplémentaire est guidée de façon étanche à l'air.
  4. Machine-outil manuelle (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que la bouterolle (19) et la douille de guidage (32) ferment un réservoir d'air (35) uniquement alimenté en air par les rainures (30).
  5. Machine-outil manuelle (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que la surface de section transversale de la section de bouterolle (22) est constante sur l'ensemble de la longueur (31) de la section de bouterolle (22).
  6. Machine-outil manuelle (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que la douille de guidage (32) est mobile dans le sens de la longueur de l'axe de travail (11) et est précontrainte par un élément amortissant (38) à l'encontre de la direction de percussion (12).
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
EP14812196.5A EP3083155B1 (fr) 2013-12-18 2014-12-09 Machine-outil manuelle
PCT/EP2014/077058 WO2015091112A1 (fr) 2013-12-18 2014-12-09 Machine-outil à main

Publications (2)

Publication Number Publication Date
EP3083155A1 EP3083155A1 (fr) 2016-10-26
EP3083155B1 true 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 (7)

* 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
US20200230795A1 (en) * 2019-01-17 2020-07-23 Donald W. Carlson Multi-Stroke Powered Safety Hammer System
EP3782766A1 (fr) * 2019-08-19 2021-02-24 Hilti Aktiengesellschaft Machine-outil manuelle
US11318596B2 (en) * 2019-10-21 2022-05-03 Makita Corporation Power tool having hammer mechanism
JP7388873B2 (ja) * 2019-10-21 2023-11-29 株式会社マキタ 打撃工具
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

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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
CN1329164C (zh) 2001-09-17 2007-08-01 密尔沃基电动工具公司 旋转锤
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

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Also Published As

Publication number Publication date
EP3083155A1 (fr) 2016-10-26
WO2015091112A1 (fr) 2015-06-25
US20160311103A1 (en) 2016-10-27
EP2886261A1 (fr) 2015-06-24
CN105829029A (zh) 2016-08-03
US10391621B2 (en) 2019-08-27

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