EP3181299A1 - Machine-outil portative a percussion - Google Patents

Machine-outil portative a percussion Download PDF

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Publication number
EP3181299A1
EP3181299A1 EP15200146.7A EP15200146A EP3181299A1 EP 3181299 A1 EP3181299 A1 EP 3181299A1 EP 15200146 A EP15200146 A EP 15200146A EP 3181299 A1 EP3181299 A1 EP 3181299A1
Authority
EP
European Patent Office
Prior art keywords
channel opening
channel
pneumatic chamber
check valve
striker
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.)
Withdrawn
Application number
EP15200146.7A
Other languages
German (de)
English (en)
Inventor
Markus Hartmann
Rory Britz
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 EP15200146.7A priority Critical patent/EP3181299A1/fr
Priority to PCT/EP2016/079894 priority patent/WO2017102437A1/fr
Priority to EP16809722.8A priority patent/EP3389934B1/fr
Priority to US16/061,397 priority patent/US10675742B2/en
Publication of EP3181299A1 publication Critical patent/EP3181299A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/12—Means for driving the impulse member comprising a crank mechanism
    • B25D11/125—Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/005—Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
    • 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
    • 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
    • B25D2250/035—Bleeding holes, e.g. in piston 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
    • B25D2250/131—Idling mode of tools
    • 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
    • B25D2250/185—Pressure equalising means between sealed chambers
    • 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
    • B25D2250/231—Sleeve details
    • 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
    • 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
    • B25D2250/365—Use of seals

Definitions

  • One embodiment provides a slide valve formed by a radial opening of the pneumatic chamber and the racket.
  • the slide valve is closed in the racket adjacent to lying in the working position striker relative to the pneumatic chamber.
  • the slide valve is open at the racket adjacent to the striker in front of the working position striker against the pneumatic chamber.
  • the slide valve allows a complete shutdown of the impact mechanism, again indirectly by the user and a lack of pressing the tool to the ground.
  • An embodiment provides that the first channel opening is arranged at a rack-side reversal point of the exciter. An embodiment provides that the channel is closed between the first channel opening and the second channel opening.
  • the pneumatic chamber has a throttle opening for exchanging air between the pneumatic chamber and the surroundings of the portable power tool.
  • the throttle opening may be arranged at a hammer-side reversal point of the exciter.
  • a ratio of the cross-sectional area of the throttle opening to the cross-sectional area of the channel opening is less than one to twelve.
  • About the throttle opening can be adjusted specifically the outflow of the increased amount of air.
  • the throttle opening is very small, whereby the outflow preferably takes up to one second.
  • An embodiment provides that the check valve is arranged stationarily at the first channel opening.
  • the striking mechanism 5 and the rotary drive 7 are arranged in a machine housing 10 .
  • a handle 11 is typically arranged on a side facing away from the tool holder 2 of the machine housing 10 .
  • the user can hold the hammer drill 1 by means of the handle 11 in operation and lead.
  • An additional auxiliary handle can be attached near the tool holder 2 .
  • an operating button 12 is arranged, which the user can operate preferably with the holding hand.
  • the electric motor 8 is turned on by operating the operating button 12 . Typically, the electric motor 8 rotates as long as the operation button 12 is kept depressed.
  • the tool 4 is movable in the tool holder 2 along the working axis 3 .
  • the tool 4 has an elongated groove into which a ball or other locking body of the tool holder 2 engages.
  • the user holds the tool 4 in a working position in that the user presses the tool 4 indirectly through the hammer drill 1 to a substrate ( Fig. 2 ).
  • the pressing is associated with a chiseling phase.
  • the tool 4 is moved by the impact of the striking mechanism 5 in the direction of impact 6 from the working position.
  • the tool 4 can remain in the advanced position if the user does not continue to press the hammer drill 1 ( Fig. 3 ).
  • the lack of pressing is associated with a rest phase and leads to an automatic shutdown of the striking mechanism 5.
  • the user can start the striking mechanism 5 by re-pressing, ie transfer from the resting phase in the chiseling phase (start phase; Fig. 4 ).
  • the compression point coincides approximately with the reversal point of the oscillatory movement of the racket 14 .
  • the bat 14 induces a shock wave in the striker 15, which passes through this and is transmitted to the voltage applied to the striker 15 tool 4 .
  • the striker 15 is movably guided in a percussion tube 21 along the working axis 3 .
  • the impact tube 21 may be formed by the exciter 13 and racket 14 leading guide tube 17 or a separate tube.
  • the striker 15 is in the impact tube 21 between a working position ( Fig. 2 ), Rest positions ( Fig. 3 ) and a starting position ( Fig. 4 ) movable.
  • the striker 15 is in the working position against the direction of impact 6 on the stop 22 .
  • the working position of the tool 4 is characterized in that the striker 15 is in its working position and the tool 4 rests against the striker 15 .
  • the shock wave induced by the racket 14 can pass from the striker 15 to the tool 4 .
  • the racquet 14 can also slide in the striking direction 6 via the percussion point when the anvil 15 is displaced sufficiently towards the working position in the impact direction 6 is.
  • the beater 14 no longer covers the vent opening 24 , ie, the pneumatic chamber 16 overlaps with the vent opening 24.
  • a cross-section of the vent openings is selected so that an air flow between the pneumatic chamber 16 and the environment is the rate of change of the volume of the pneumatic chamber 16 of the moving exciter 13 .
  • the pressure in the pneumatic chamber 16 differs only slightly from the environment, so no appreciable force is exerted on the bat 14 .
  • the percussion mechanism 5 is deactivated despite the still moving exciter 13.
  • An accumulated cross-sectional area of the ventilation openings 24 is in the range between 2% and 6% of the cross-sectional area of the pneumatic chamber 16, ie the end face of the exciter 13.
  • the amount of air (air mass) in the pneumatic chamber 16 increases when the striker 15 is in the starting area.
  • the increased amount of air leads to a higher average pressure in the pneumatic chamber 16.
  • the amount of air is reduced both when the striker 15 changes to the rest position or to the working position.
  • the amount of air in the pneumatic chamber 16 equalizes within ten to fifty cycles of the exciter 13 to the environment. Depending on the size of the impact mechanism 5 , for example, 500 milliseconds (ms) to 800 ms pass by.
  • the preferably single throttle opening 33 is in particular significantly smaller than the ventilation openings 24 and the channel opening 30.
  • the cross-sectional area of the throttle opening 33 is preferably less than 6% of the cross-sectional area of the ventilation opening 24 and preferably less than 8% of the cross-sectional area of the channel opening 30.
  • the channel 27, four first channel openings 30 with a cross-sectional area of 2 mm 2 each, and the cross-sectional area of the throttle opening 33 is 0.5 mm 2 .
  • the exemplary check valve 28 has a stationary valve seat 34 and a resilient lock body 35 in a valve passage 36 (FIGS. Fig. 5 ).
  • the valve channel 36 opens into the second channel opening 31.
  • the check valve 28 is closed when the blocking body 35 completely abuts against the valve seat 34 and thereby strangles the valve channel 36 .
  • the locking body 35 is elastically braced when the locking body 35 completely rests against the valve seat 34 .
  • the check valve 28 is self-opening. Without external force of the locking body 35 relaxes from the strained shape in a basic shape, which is not or only partially applied to the valve seat 34 .
  • the check valve 28 is switched by means of the striker 15 .
  • the striker 15 has an active surface 37 which actuates the blocking body 35 .
  • the active surface 37 forces the locking body 35 against the valve seat 34 when the striker 15 is in the working position. If the striker 15 is located in the direction of impact 6 behind the switching point, the active surface 37 is force-free or non-
  • the exemplary locking body 35 is an elastic ring, for example made of rubber.
  • the blocking body 35 is arranged inside the impact tube 21 coaxially with the working axis 3 .
  • the exemplary valve seat 34 has in the radial direction to the working axis 3 and lies with the locking body 35 in a plane.
  • the distance of the valve seat 34 to the working axis 3 is slightly larger than the outer radius of the elastic ring.
  • the active surface 37 of the striker 15 is a section of the cylindrical lateral surface.
  • the radius of the lateral surface is greater by at least the gap than an inner radius of the ring.
  • the active surface 37 is within the plane when the striker 15 is in the working position.
  • the active surface 37 spreads the ring so far that the ring completely touches the valve seat 34 . If the striker 15 is outside the working position, the ring contracts in the radial direction into its basic shape and separates from the valve seat 34.
  • the exemplary check valve 29 is based on a movable locking body 38 and an inclined guide surface 39 (FIG. Fig. 6 ).
  • the check valve 29 has a passage 40 in which an air flow can flow through the check valve 29 .
  • the check valve 29 locks automatically in an air flow against the passage direction 40.
  • the movable blocking body 35 lies in a bulge 41 of the channel 27.
  • the bulge 41 has a dimension along the passage direction 40, which allows a movement of the blocking body 38 along the passage 40 .
  • the inclined guide surface 39 is provided on the input side of the bulge 41 .
  • the guide surface 39 approaches the passage 27 counter to the passage direction 40 , as a result of which the blocking body 35 pressed against the guide surface 39 by a flow of air flowing in the opposite direction to the passage direction 40 is pressed into the passage 27 .
  • the movable blocking body 35 may be a ball or an elastic ring spanning the guide tube 17 .
  • FIGS. 7, 8 and 9 An embodiment of the check valve 42 is in FIGS. 7, 8 and 9 shown.
  • the check valve 28 is actuated by the striker 15 .
  • the striker 15 closes the check valve 28 when the striker 15 is in the working position ( Fig. 7 upper half of the picture; Fig. 8 ).
  • the check valve 28 is opened when the striker 15 is displaced from the working position ( Fig. 8 lower half of the picture; Fig. 9 ).
  • the ring 46 has a circumferential notch 48 which divides the ring 46 along the axis into the valve seat 43 and the lock body 44 .
  • the locking body 44 may be configured in the form of a thin lip.
  • the blocking body 44 can be pivoted into the notch 48 to such an extent that the blocking body 44 touches the valve seat 43 and closes the notch 48 (FIG. Fig. 8 ).
  • the ring 46 in particular the lip-shaped locking body 44 and a Block body 35 with the valve seat 43 connecting web 49, are elastically clamped when the locking body 44 abuts against the valve seat 43 .
  • the notch 48 is opened, that is, the blocking body 44 is at a distance from the valve seat 43 (FIG. Fig. 9 ).
  • the ring 46 has one or more radial punctures 50 in the valve seat 43 and an axial puncture 51 in the locking body 44.
  • the air can from the intermediate chamber 26 through the radial puncture 50 on the side with the notch 48, in the notch 48 and through the axial puncture 51 from the check valve 42 flow into the channel 27 .
  • the notch 48 is compressed, that is, the lip-shaped locking body 44 abuts against the valve seat 43 , the air flow is interrupted.
  • the ring 46 lies with its radially inner surface airtight on the guide tube 17 , the notch 48 is on the radial outer side.
  • the ring 46 may alternatively be arranged with the lip-shaped locking body in the direction of impact 6 and the valve seat against the seat.
  • the ring 46 is formed of, for example, rubber or a synthetic rubber.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP15200146.7A 2015-12-15 2015-12-15 Machine-outil portative a percussion Withdrawn EP3181299A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP15200146.7A EP3181299A1 (fr) 2015-12-15 2015-12-15 Machine-outil portative a percussion
PCT/EP2016/079894 WO2017102437A1 (fr) 2015-12-15 2016-12-06 Machine-outil portative à percussion
EP16809722.8A EP3389934B1 (fr) 2015-12-15 2016-12-06 Machine-outil portative a percussion
US16/061,397 US10675742B2 (en) 2015-12-15 2016-12-06 Striking hand-held machine tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15200146.7A EP3181299A1 (fr) 2015-12-15 2015-12-15 Machine-outil portative a percussion

Publications (1)

Publication Number Publication Date
EP3181299A1 true EP3181299A1 (fr) 2017-06-21

Family

ID=54936814

Family Applications (2)

Application Number Title Priority Date Filing Date
EP15200146.7A Withdrawn EP3181299A1 (fr) 2015-12-15 2015-12-15 Machine-outil portative a percussion
EP16809722.8A Active EP3389934B1 (fr) 2015-12-15 2016-12-06 Machine-outil portative a percussion

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP16809722.8A Active EP3389934B1 (fr) 2015-12-15 2016-12-06 Machine-outil portative a percussion

Country Status (3)

Country Link
US (1) US10675742B2 (fr)
EP (2) EP3181299A1 (fr)
WO (1) WO2017102437A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3181301A1 (fr) 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Machine-outil portative a percussion
EP3181298A1 (fr) 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Machine-outil a percussion
US11833652B2 (en) * 2022-01-25 2023-12-05 Hilti Aktiengesellschaft Power tool

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7709910A (nl) * 1976-09-11 1978-03-14 Bosch Gmbh Robert Motorisch aangedreven slaghamer.
US20020108766A1 (en) * 2001-01-24 2002-08-15 Uto Plank Percussion mechanism for an electrical hand-held tool with a blank blow cut-off
EP1607187A1 (fr) * 2004-06-18 2005-12-21 HILTI Aktiengesellschaft Procédé et appareil pour l'amélioration de la réponse en coupure d'un outil électropneumatique à percussion
US20120024555A1 (en) * 2010-08-02 2012-02-02 Makita Corporation Impact tool
EP2653270A2 (fr) * 2012-04-19 2013-10-23 HILTI Aktiengesellschaft Machine-outil manuelle et procédé de commande
WO2015067590A1 (fr) * 2013-11-11 2015-05-14 Hilti Aktiengesellschaft Machine-outil à main

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5930607A (ja) 1982-08-12 1984-02-18 Hitachi Koki Co Ltd 電気ハンマドリル
DE3826213A1 (de) 1988-08-02 1990-02-15 Bosch Gmbh Robert Bohr- oder schlaghammer
DE19810088C1 (de) 1998-03-10 1999-08-26 Bosch Gmbh Robert Bohr- und/oder Schlaghammer mit in Abhängigkeit von der Einstecktiefe eines Werkzeuges aktivierbarem Schlagwerk
JP5154995B2 (ja) * 2008-03-28 2013-02-27 株式会社マキタ 打撃工具
EP3181301A1 (fr) 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Machine-outil portative a percussion
EP3181298A1 (fr) 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Machine-outil a percussion
EP3181300A1 (fr) 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Machine-outil portative a percussion

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7709910A (nl) * 1976-09-11 1978-03-14 Bosch Gmbh Robert Motorisch aangedreven slaghamer.
US20020108766A1 (en) * 2001-01-24 2002-08-15 Uto Plank Percussion mechanism for an electrical hand-held tool with a blank blow cut-off
EP1607187A1 (fr) * 2004-06-18 2005-12-21 HILTI Aktiengesellschaft Procédé et appareil pour l'amélioration de la réponse en coupure d'un outil électropneumatique à percussion
US20120024555A1 (en) * 2010-08-02 2012-02-02 Makita Corporation Impact tool
EP2653270A2 (fr) * 2012-04-19 2013-10-23 HILTI Aktiengesellschaft Machine-outil manuelle et procédé de commande
WO2015067590A1 (fr) * 2013-11-11 2015-05-14 Hilti Aktiengesellschaft Machine-outil à main

Also Published As

Publication number Publication date
EP3389934B1 (fr) 2019-09-11
US10675742B2 (en) 2020-06-09
WO2017102437A1 (fr) 2017-06-22
EP3389934A1 (fr) 2018-10-24
US20190039225A1 (en) 2019-02-07

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