EP3065914A1 - Machine-outil portative - Google Patents

Machine-outil portative

Info

Publication number
EP3065914A1
EP3065914A1 EP14790626.7A EP14790626A EP3065914A1 EP 3065914 A1 EP3065914 A1 EP 3065914A1 EP 14790626 A EP14790626 A EP 14790626A EP 3065914 A1 EP3065914 A1 EP 3065914A1
Authority
EP
European Patent Office
Prior art keywords
catcher
impact
working axis
hand tool
tolerance
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
EP14790626.7A
Other languages
German (de)
English (en)
Other versions
EP3065914B1 (fr
Inventor
Theo Kiesel
Helene KAPS
Matthias Keith
Olaf Koch
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 EP14790626.7A priority Critical patent/EP3065914B1/fr
Publication of EP3065914A1 publication Critical patent/EP3065914A1/fr
Application granted granted Critical
Publication of EP3065914B1 publication Critical patent/EP3065914B1/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
    • B25D17/11—Arrangements of noise-damping means
    • 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
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/191—Ram catchers for stopping the ram when entering idling mode
    • 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
    • B25D2250/245—Spatial arrangement of components of the tool relative to each other
    • 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
    • B25D2250/371—Use of springs
    • 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
    • B25D2250/391—Use of weights; Weight properties of the tool

Definitions

  • the present invention relates to a hand tool with a hammer mechanism, in particular for use with chiseling tools.
  • a striking mechanism has several moving components that repeatedly move along a working axis and hit each other. This leads to a considerable noise. Precise guidance of the striking components parallel to the working axis prevents skewing of the striking components and rattling due to partial radial movement.
  • the hand tool of the invention has a tool holder, in which a tool on a working axis in a direction of impact is movable.
  • An impact mechanism has a beater coupled via a pneumatic chamber to a pathogen that is moved periodically along the working axis and an intermediate beater arranged in the direction of impact after the beater.
  • the intermediate beater is guided in a sliding bearing, with a tolerance coaxial to the working axis
  • the intermediate beater has an annular bead.
  • a hollow cylindrical catcher is arranged in the direction of impact in front of the bead. The catcher is movably guided on a sliding surface with a radial clearance along the working axis.
  • the radial clearance is at least three times as large as a tolerance of the guide of the intermediate racket in the sliding bearing.
  • the beating components are strictly managed as usual. In contrast, it may prove advantageous not to stringently guide a catcher for the intermediate bat. Although this can now move radially and thereby rattle, the overall noise is lower.
  • the impact of the intermediate impactor stimulates a radial vibration in the catcher, which also depends on the guidance.
  • the strict leadership proves to be unfavorable, since the resulting higher frequencies resonantly excite the housing.
  • One embodiment provides that the mass of the catcher is between 20% and 40% of the mass of the intermediate beater.
  • the catcher may be supported against the impact direction on a damping element. In particular, the catcher may be inserted between the damping element and a further damping element arranged in the direction of impact under prestressing.
  • An embodiment provides that a spring element spans a radial outer surface of the catcher.
  • the spring element centered the catcher to the working axis after an impact of the intermediate beater has occurred.
  • Fig. 1 a hammer drill
  • Fig. 2 shows a partial section of the hammer drill Same or functionally identical elements are indicated by the same reference numerals in the figures, unless stated otherwise.
  • FIG. 1 schematically shows a hammer drill 1 as an example of a chiseling hand tool.
  • the hammer 1 has a tool holder 2 in which a shank end 3 of a tool, eg a chisel 4, can be inserted.
  • 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 1 by means of a system switch 10 in operation.
  • the hammer drill 1 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 percussion 6 is a pneumatic percussion 6.
  • An exciter piston 13 and a racket 14 are movably guided in a guide tube 15 in the striking mechanism 6 along the working axis 11.
  • the exciter piston 13 is connected to the motor 5 via an eccentric 16 coupled and forced to a periodic, linear motion.
  • a connecting rod connects the eccentric 16 with the excitation piston 13.
  • An air spring formed by a pneumatic chamber 17 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 racket 14 indirectly transmits a portion of its momentum to the chisel 4 via a substantially stationary intermediate racket 18.
  • the percussion unit 6, and preferably the further drive components, are disposed within a machine housing 19.
  • the intermediate beater 18 has a substantially cylindrical base body 20.
  • the intermediate beater 18 is guided in a sliding bearing 21, 22 coaxial with the working axis 11.
  • the exemplary two-part sliding bearing 21, 22 encloses with a front sleeve 21 a machine-side end of the base body 20 and a rear sleeve 22, the tool-side end of the base body 20.
  • the diameter of the base body 20 deviates by a distance 23 of less than 50 ⁇ of the inner diameter the sleeves 21, 22 from. This corresponds to the typical for plain bearings 21, 22 tolerance H7 for the sleeves 21, 22 and g7 for the intermediate beater 18, each according to the ISO standard.
  • the tight tolerance ensures coaxial guidance, even with forces occurring in the range of 10 kN during impact.
  • the intermediate beater 18 is movable between a working position (upper half of FIG. 2) and an advanced position in the direction of impact 12 (lower half of FIG. 2).
  • the intermediate beater 18 has a relative to the base 20 radially projecting bead 24, which is preferably provided in a central portion of the intermediate beater 18.
  • the bead 24 bears against the impact direction 12 on a catcher 25 when the intermediate beater 18 is in the working position.
  • the catcher 25 has a hollow cylindrical shape with a radial outer surface 26.
  • the exemplary catcher 25 has a radially inwardly projecting collar 27, against which the bead 24 bears against the impact direction 12.
  • a length 28 of the catcher 25, in particular the radial outer surface 26 is in the range of 10% and 25% of the length 29 of the intermediate beater 18.
  • the movement of the intermediate beater 18 in the direction of impact 12 is stopped by a damped stop 30, if at this the bead 24th comes in the direction of impact 12 to concern.
  • the free path of the intermediate beater 18 from the working position to the stop 30 is small hammer drills in the range of 1 cm and 3 cm and large chisel in the range of 3 cm to 5 cm.
  • the catcher 25 is supported against the direction of impact 12 by a damping element 31 on the machine housing 19.
  • the catcher 25 shifts slightly over the Housing, when the intermediate beater 18 bounces against the catcher 25.
  • the catcher 25 also has a relative to the intermediate beater 18 is not negligible mass to reduce the bounce.
  • the mass of the catcher 25 is preferably in the range of 20% to 40% of the mass of the intermediate beater 18.
  • the large mass of the catcher 25 results from its axial dimension 28.
  • the catcher 25 is preferably between the damping element 31 and another in the direction of impact 12th arranged damping element 32 clamped.
  • the two damping elements 31, 32 are biased along the working axis 11.
  • the catcher 25 is held along the working axis 11 by the two damping or spring elements 31, 32 in a rest position.
  • the catcher 25 is coaxial with the working axis 11, i. coaxial with the intermediate beater 18, guided.
  • the axial guidance of the catcher 25 is effected by its cylindrical outer surface 26.
  • the axial dimension of the outer surface 26 is approximately equal to the length of the catcher 25.
  • the counterpart of the guide can be done for example by a cylindrical radial inner surface 33 of the machine housing 19.
  • the guide is provided with a clear radial play 34.
  • the clearance 34 should be at least 0.15 mm, ie more than three times the guide tolerance 23 of the sliding bearing 21, 22 for the intermediate beater 18.
  • the clearance 34 is in the radial direction between the metallic outer surface 26 of the catcher 25 and the leading metallic inner surface 33rd , here the machine housing 19 to determine.
  • the high tolerance proves to be favorable in order to reduce the noise of the collision of the impact pad 18 on the catcher 25.
  • the catcher 25 may be provided with radial spring elements 35 made of an elastomer, which surround the outer surface 26 and bear against the inner surface 33 of the guide 36.
  • the front sliding bearing 21 may have an inserted sealing ring 37, which the tolerance 23 is arranged balancing on the inside of the sleeve 21.
  • the sealing ring 37 strips off fine dust from the intermediate beater 18, and prevents penetration of the dust in the impact mechanism. 6
  • the guide tube 15 bz is a separate component to the machine housing 19 bz, which is arranged completely within the machine housing 19.
  • the guide tube 15 may also be partially exposed, ergo form part of the outer machine housing 19.

Landscapes

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

Abstract

L'invention concerne une machine-outil portative présentant un porte-outil (2) dans lequel un outil (4) peut être inséré mobile sur un axe de travail (11) dans une direction de percussion (12). Un mécanisme de percussion (6) présente un percuteur (14) accouplé à un excitateur (13) déplacé périodiquement le long de l'axe de travail (11) par l'intermédiaire d'une chambre pneumatique (17) et un percuteur intermédiaire (18) disposé dans la direction de percussion (12) en aval du percuteur (14). Le percuteur intermédiaire (18) est guidé dans un palier lisse (21, 22) avec une tolérance (23) de manière coaxiale par rapport à l'axe de travail (11). Le percuteur intermédiaire (18) présente un renflement annulaire (24). Un collecteur de forme cylindrique creuse (25) est disposé dans la direction de percussion (12) en amont du renflement (24). Le collecteur (25) est guidé mobile sur une surface de glissement (33b) avec un jeu radial (34) le long de l'axe de travail (11). Le jeu radial (34) est au moins trois fois plus élevé qu'une tolérance du guidage du percuteur intermédiaire (18) dans le palier lisse (21, 22).
EP14790626.7A 2013-11-06 2014-10-30 Machine-outil manuelle Active EP3065914B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14790626.7A EP3065914B1 (fr) 2013-11-06 2014-10-30 Machine-outil manuelle

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP20130191708 EP2871030A1 (fr) 2013-11-06 2013-11-06 Machine-outil manuelle
PCT/EP2014/073304 WO2015067517A1 (fr) 2013-11-06 2014-10-30 Machine-outil portative
EP14790626.7A EP3065914B1 (fr) 2013-11-06 2014-10-30 Machine-outil manuelle

Publications (2)

Publication Number Publication Date
EP3065914A1 true EP3065914A1 (fr) 2016-09-14
EP3065914B1 EP3065914B1 (fr) 2019-12-04

Family

ID=49518827

Family Applications (2)

Application Number Title Priority Date Filing Date
EP20130191708 Withdrawn EP2871030A1 (fr) 2013-11-06 2013-11-06 Machine-outil manuelle
EP14790626.7A Active EP3065914B1 (fr) 2013-11-06 2014-10-30 Machine-outil manuelle

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP20130191708 Withdrawn EP2871030A1 (fr) 2013-11-06 2013-11-06 Machine-outil manuelle

Country Status (4)

Country Link
US (1) US10286537B2 (fr)
EP (2) EP2871030A1 (fr)
CN (1) CN105705300A (fr)
WO (1) WO2015067517A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3000560A1 (fr) * 2014-09-25 2016-03-30 HILTI Aktiengesellschaft Appareil d'enfoncement à ressort à gaz
EP3231560A1 (fr) * 2016-04-13 2017-10-18 HILTI Aktiengesellschaft Machine-outil portative
US20240123589A1 (en) * 2019-11-12 2024-04-18 Hilti Aktiengesellschaft Impact mechanism arrangement

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2844109A1 (de) 1978-10-10 1980-04-24 Bosch Gmbh Robert Handwerkzeugmaschine, insbesondere bohr- und/oder schlaghammer
ES2208623T3 (es) * 2001-03-07 2004-06-16 Black & Decker Inc. Martillo.
DE102005000042A1 (de) 2005-04-25 2006-10-26 Hilti Ag Bohr-oder Meisselhammer
DE102006000209A1 (de) 2006-05-05 2007-11-15 Hilti Ag Handwerkzeugmaschine mit Schlagwerkzeugaufnahme
DE102006000533A1 (de) 2006-12-18 2008-06-19 Hilti Ag Handwerkzeugmaschine mit pneumatischem Schlagwerk
JP5147488B2 (ja) * 2008-03-27 2013-02-20 株式会社マキタ 作業工具

Also Published As

Publication number Publication date
EP2871030A1 (fr) 2015-05-13
EP3065914B1 (fr) 2019-12-04
US10286537B2 (en) 2019-05-14
US20160279778A1 (en) 2016-09-29
CN105705300A (zh) 2016-06-22
WO2015067517A1 (fr) 2015-05-14

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