EP3107693B1 - Machine-outil portative - Google Patents

Machine-outil portative Download PDF

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Publication number
EP3107693B1
EP3107693B1 EP15703606.2A EP15703606A EP3107693B1 EP 3107693 B1 EP3107693 B1 EP 3107693B1 EP 15703606 A EP15703606 A EP 15703606A EP 3107693 B1 EP3107693 B1 EP 3107693B1
Authority
EP
European Patent Office
Prior art keywords
hand
rings
power tool
held power
piston
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
EP15703606.2A
Other languages
German (de)
English (en)
Other versions
EP3107693A1 (fr
Inventor
Markus Holubarsch
Ferdinand Kristen
Stefan Schmid
Benjamin Lederle
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 EP3107693A1 publication Critical patent/EP3107693A1/fr
Application granted granted Critical
Publication of EP3107693B1 publication Critical patent/EP3107693B1/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
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/068—Crank-actuated impulse-driving mechanisms
    • 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
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0023—Pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/21—Metals
    • B25D2222/27—Brass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/21—Metals
    • B25D2222/31—Bronze
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/21—Metals
    • B25D2222/33—Copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/54—Plastics
    • 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
    • B25D2250/345—Use of o-rings

Definitions

  • the present invention relates to a hand tool with a pneumatic hammer mechanism, in particular a hammer drill, according to the preamble of claim 1.
  • a generic hand tool is in the GB 2063141 A described.
  • the striking mechanism has an excitation piston, which is moved back and forth periodically along an axis by an eccentric drive.
  • the excitation piston is inserted into a guide tube coaxial with the axis.
  • An inserted also in the guide tube racket is coupled by a trained between the exciter piston and the bat air spring to the movement of the exciter piston.
  • the excitation piston and the guide tube are made of a plastic to improve the thermal efficiency of the impact mechanism.
  • the use of the same material for the guide tube and the excitation piston ensures that they have the same coefficient of thermal expansion, which in turn allows the exciter piston to be manufactured with a small gap.
  • the hand tool of the invention has a tool holder for receiving a tool on a working axis.
  • a pneumatic percussion mechanism has an excitation piston which is forcedly moved by a motor periodically along the working axis and a racket which is coupled to the exciter piston via a pneumatic chamber.
  • the excitation piston has a cylindrical body made of a polymer.
  • One or more copper-containing rings span the body. The rings protrude in the radial direction with respect to the base body.
  • the main body made of plastic is held by the rings at a distance from a guide tube.
  • the copper-containing rings can reduce the coefficient of friction so much that an increased thermal loss and due to different thermal expansion coefficients over-compensated voltage.
  • the excitation piston is preferably guided in a guide tube made of a polymer which thermally insulates the pneumatic chamber in the radial direction.
  • Fig. 1 schematically shows a hammer drill 1 as an example of a chiseling hand tool .
  • the hammer drill 1 has a tool holder 2, in which a shank end 3 of a tool, for example 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 guide the hammer drill 1 by means of a handle 9 and be by means of a system switch 10 to the hammer drill 1 is 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 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 racket 14 can strike directly on a rear end of the drill 4 or indirectly transmit a portion of its pulse to the drill 4 via a substantially resting intermediate racket 19 .
  • the striking mechanism 6 and preferably the further drive components are arranged within a machine housing 20 .
  • the excitation piston 13 has a cup-shaped main body 21, which is oriented coaxially to the working axis 11 ( Fig. 2 ).
  • the hollow body 21 has a substantially cylindrical shell 22 and is closed in the direction of impact 12 by a circular end face 23 .
  • the main body 13 is made entirely of a polymer.
  • One end of the connecting rod 17 is rotatably or pivotably mounted within the exciter piston 13 .
  • the excitation piston 13 has one or more copper-containing rings 24, which surround the casing 22 of the main body 21 .
  • the exciter piston 13 shown by way of example is provided with three identical rings 24 , which are arranged offset along the working axis 11 .
  • the jacket 22 may be provided with annular grooves 25 , in which the rings 24 are embedded.
  • the outer diameter 26 of the rings 24 is larger than the outer diameter 27 of the base body 21.
  • the difference in outer diameter is between 0.2 mm to 1.0 mm.
  • the rings 24 cover between 25% and 70% of the shell 22.
  • its radial outer surface 28 is cylindrical, ie parallel to the working axis 11.
  • the sliding surface formed by the rings 24 is large enough to the exciter piston 13 in the radial direction on the guide tube 15 support.
  • the rings 24 do not form a continuous thermal bridge over the length of the excitation piston 13.
  • a plurality of rings 24 are provided and these are separated from each other along the working axis 11 by a gap 29 .
  • the copper-containing rings 24 are preferably made of bronze or brass.
  • the exciter piston 13 is further provided with a sealing ring 30 made of an elastic material, for example rubber.
  • the sealing ring 30 is inserted into a corresponding annular groove 31 near the end face 23 .
  • the sealing ring 30 has the largest outer diameter 32 of the components of the excitation piston thirteenth
  • the guide tube 15 is preferably made entirely of a polymer, or at least the inner surface 33 of the guide tube 15 is made of a polymer.
  • the guide tube 15 made of polymer has a low thermal conductance and thus reduces thermal losses of the pneumatic chamber 18th

Landscapes

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

Claims (5)

  1. Machine-outil manuelle comportant :
    un mandrin (2) pour recevoir un outil sur un axe de travail (11),
    un moteur (5),
    un mécanisme de percussion pneumatique (6) comportant un piston excitateur (13) déplacé de manière forcée par le moteur (5) périodiquement le long de l'axe de travail (11) et un percuteur (14) couplé au piston excitateur (13) par l'intermédiaire d'une chambre pneumatique (18), dans laquelle le piston excitateur (13) comporte un corps principal cylindrique (21) constitué d'un polymère, caractérisée en ce que
    une ou plusieurs bagues contenant du cuivre (24) entourent le corps principal (21) et les bagues (24) font saillie dans une direction radiale par rapport au corps principal (21).
  2. Machine-outil manuelle selon la revendication 1, caractérisée en ce qu'un diamètre extérieur (26) des bagues contenant du cuivre (24) est supérieur de 0,2 mm à 1,0 mm qu'un diamètre extérieur (27) du corps principal (21).
  3. Machine-outil manuelle selon la revendication 1 ou 2, caractérisée en ce que les bagues (24) couvrent entre 25 % et 70 % d'une enveloppe (22) du corps principal (21).
  4. Machine-outil manuelle selon l'une des revendications précédentes, caractérisée en ce qu'entre les bagues (24) est prévu un espace (29) le long de l'axe de travail (11).
  5. Machine-outil manuelle selon l'une des revendications précédentes, caractérisée en ce que le piston excitateur (13) est guidé dans un tube de guidage (15) constitué d'un polymère.
EP15703606.2A 2014-02-21 2015-02-11 Machine-outil portative Active EP3107693B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14156105.0A EP2910336A1 (fr) 2014-02-21 2014-02-21 Machine-outil portative
PCT/EP2015/052813 WO2015124470A1 (fr) 2014-02-21 2015-02-11 Machine-outil à main

Publications (2)

Publication Number Publication Date
EP3107693A1 EP3107693A1 (fr) 2016-12-28
EP3107693B1 true EP3107693B1 (fr) 2017-10-18

Family

ID=50150636

Family Applications (2)

Application Number Title Priority Date Filing Date
EP14156105.0A Withdrawn EP2910336A1 (fr) 2014-02-21 2014-02-21 Machine-outil portative
EP15703606.2A Active EP3107693B1 (fr) 2014-02-21 2015-02-11 Machine-outil portative

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP14156105.0A Withdrawn EP2910336A1 (fr) 2014-02-21 2014-02-21 Machine-outil portative

Country Status (4)

Country Link
US (1) US20170057072A1 (fr)
EP (2) EP2910336A1 (fr)
CN (1) CN105939821B (fr)
WO (1) WO2015124470A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018108280A1 (de) * 2017-05-05 2018-11-08 Fischerwerke Gmbh & Co. Kg Setzgerät
EP3789161A1 (fr) * 2019-09-06 2021-03-10 Hilti Aktiengesellschaft Machine-outil manuelle

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3114423A (en) * 1960-03-30 1963-12-17 Skil Corp Rotary-hammer device
DE2726214A1 (de) * 1977-06-10 1978-12-21 Hilti Ag Bohrhammer mit pneumatisch angetriebenem schlagkolben
DE2945935A1 (de) 1979-11-14 1981-05-27 Robert Bosch Gmbh, 7000 Stuttgart Handwerkzeugmaschine mit einem luftfederschlagwerk
DE3010479A1 (de) * 1980-03-19 1981-10-08 Robert Bosch Gmbh, 7000 Stuttgart Werkzeugmaschine, insbesondere handwerkzeugmaschine mit einem luftfederschlagwerk
US4388776A (en) * 1980-06-16 1983-06-21 Tomy Corporation Pneumatically operated toy employing a movable implement
US4554208A (en) * 1983-12-27 1985-11-19 General Motors Corporation Metal bearing surface having an adherent score-resistant coating
SE8900947D0 (sv) * 1989-03-16 1989-03-16 Atlas Copco Ab Slagverktyg
SE500864C2 (sv) * 1989-10-28 1994-09-19 Berema Atlas Copco Ab Dämpanordning vid slagverk
US6395359B1 (en) * 1997-08-13 2002-05-28 The United States Of America As Represented By The Secretary Of The Navy Power cylinder non-metallic liner seal assembly
AU2002326946A1 (en) * 2001-09-17 2003-04-01 Milwaukee Electric Tool Corporation Rotary hammer
GB2423044A (en) * 2005-02-10 2006-08-16 Black & Decker Inc Hammer with cam-actuated driven member
DE102005019710A1 (de) * 2005-04-28 2006-11-09 Robert Bosch Gmbh Handwerkzeugmaschinenschlagwerkeinheit
FI119228B (fi) * 2006-12-05 2008-09-15 Sandvik Mining & Constr Oy Rikotuslaitteen työkalun laakerointi
CN101444909B (zh) * 2007-11-27 2013-03-27 希尔蒂股份公司 具有气动冲击装置的手持式工具机
DE102009002474A1 (de) * 2009-04-20 2010-10-21 Hilti Aktiengesellschaft Pneumatisches Schlagwerk und Handwerkzeugmaschine
DE102009026542A1 (de) * 2009-05-28 2010-12-09 Hilti Aktiengesellschaft Werkzeugmaschine
US9045963B2 (en) * 2010-04-23 2015-06-02 Smith International, Inc. High pressure and high temperature ball seat
DE102010042809A1 (de) * 2010-10-22 2012-04-26 Hilti Aktiengesellschaft Werkzeugmaschine
DE102011075765A1 (de) * 2011-05-12 2012-11-15 Hilti Aktiengesellschaft Handwerkzeugmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
WO2015124470A1 (fr) 2015-08-27
CN105939821A (zh) 2016-09-14
EP3107693A1 (fr) 2016-12-28
CN105939821B (zh) 2018-02-23
US20170057072A1 (en) 2017-03-02
EP2910336A1 (fr) 2015-08-26

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