EP2937185A1 - Machine-outil portative - Google Patents

Machine-outil portative Download PDF

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Publication number
EP2937185A1
EP2937185A1 EP14165393.1A EP14165393A EP2937185A1 EP 2937185 A1 EP2937185 A1 EP 2937185A1 EP 14165393 A EP14165393 A EP 14165393A EP 2937185 A1 EP2937185 A1 EP 2937185A1
Authority
EP
European Patent Office
Prior art keywords
axis
eccentric
exciter
shaped
pathogen
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Withdrawn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
EP14165393.1A
Other languages
German (de)
English (en)
Inventor
Stefan Hammerstingl
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 EP14165393.1A priority Critical patent/EP2937185A1/fr
Publication of EP2937185A1 publication Critical patent/EP2937185A1/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Withdrawn legal-status Critical Current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
    • 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
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/003—Crossed drill and motor spindles
    • 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
    • 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

Definitions

  • the present invention relates to a chiseling hand tool, in particular with an electro-pneumatic impact mechanism.
  • US 2010/0012337 discloses a percussion hammer with an electric motor and a pneumatic percussion.
  • the striking mechanism has a cup-shaped exciter, which is moved back and forth by an eccentric along a striking axis.
  • the eccentric wheel acts on a lateral surface of the pathogen.
  • a piston-shaped racket is inserted in the pathogen.
  • a pneumatic chamber is completed, which forms a club connecting the bat to the exciter air spring.
  • the hand tool of the invention has a tool holder for receiving a tool along a working axis.
  • a pneumatic percussion mechanism has a cup-shaped gripper closed by a base oriented perpendicular to the working axis, a piston-shaped racket arranged in the exciter, and a pneumatic chamber enclosed between the pathogen and the rack in the exciter.
  • An eccentric is driven by a motor about a rotation axis.
  • An eccentric finger is spaced from the axis of rotation by a crank radius. The eccentric finger couples to an attack on the cup-shaped pathogen. A distance of the attack from the ground is twice to six times as long as the crank radius.
  • the eccentric finger is close to the point of impact when the bat impacts an anvil or tool in the point of impact. This favors the stability and smoothness of the pathogen in the lateral offaxial attack.
  • the axis of rotation is preferably arranged between the one and two times the crank radius in front of the impact point.
  • 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 striking mechanism 6 and preferably the further drive components are arranged within a machine housing 13 .
  • the percussion 6 is a pneumatic percussion 6.
  • a pathogen 14 is guided in a one or more parts guide sleeve 15 along the working axis 11 .
  • the exciter 14 is cup-shaped.
  • the exciter 14 is composed essentially of a cylindrical tube 16 and a tube 16 closing the bottom 17 together.
  • a piston-shaped racket 18 of the impact mechanism 6 is inserted into the exciter 14 .
  • the beater 18 can slide in the exciter 14 along the working axis 11 .
  • the racket 18 is airtight with the tube 16 , so that between the exciter 14 and the bottom 17, a pneumatic chamber 19 is formed.
  • the bat 18 strikes in the direction of impact 12 on a striking surface 20 of an anvil 21 .
  • the striker 21 transmits the shock to the drill 4.
  • the striker 21 has a defined position during operation, so that the impact surface 20 of the striker 21 defines a point of impact of the racquet 18 .
  • the exciter 14 is periodically moved back and forth by an eccentric 22 along the working axis 11 .
  • the eccentric 22 is coupled via a gear to the motor 5 .
  • the eccentric 22 has, for example, a disc which is about an axis of rotation 23 of the motor fifth is turned.
  • an eccentric 24 is disposed about a crank radius 25 offset from the axis of rotation 23 .
  • the eccentric finger 24 engages via a connecting rod 26 to an attack 27, such as a pin, on the exciter 14 .
  • the periodic movement of the exciter 14 transfers the pneumatic chamber 19 to the racket 18.
  • the racket 18 oscillates along the working axis 11 between the point of impact in which the racket 18 strikes the striker 21 and a point of inflection in which the pneumatic chamber 19 is strong is compressed.
  • the exciter 14 reaches due to the dynamics of the pneumatic impact mechanism 6 his in the direction of impact 12 farthest advanced position in about when the racket 18 is in the spotlight.
  • the attack 27 of the exciter 14 is unilateral, asymmetrical and offset from the working axis 11. Accordingly, the eccentric 22 exerts a torque on the exciter 14 .
  • the loads are dependent on the phase of the percussion 6.
  • the torque is low, as this typically the exciter 14 has reached the front inflection point.
  • the highest loads occur when pathogen 14 is half way to the inflection point.
  • the exciter 14 here has the highest speed, the pneumatic chamber 19 is the most compressed and consequently the racket 18 is accelerated the most.
  • the counterforce is introduced into the eccentric 22 .
  • the eccentric finger 24 is in the position outside of the plane spanned by the axis of rotation 23 and the working axis 11 , resulting in a high lateral load.
  • the arrangement of the eccentric 22 allows the guide sleeve 15 to be arranged so that it absorbs the transverse loads.
  • the guide sleeve 15 preferably surrounds annularly the volume of space in which the racket 18 is in the inflection point.
  • the axis of rotation 23 of the eccentric 22 is to between one and two crank radii 25 in the direction of impact 12 before the impact point. In the illustrated embodiment with a connecting rod 26 it follows that the attack 27 between the four and six times the crank radius 25 is removed from the bottom 17 .
  • the exciter cylinder may have an oblong hole extending transversely to the working axis 11 as an attack 27 ; here, without the connecting rod 26, the distance 28 is approximately twice to four times the crank radius 25.
  • the output shaft 7 is arranged in the direction of impact 12 after the exciter 14 .
  • the output shaft 7 may, for example, have a bevel gear 29 arranged on it, which meshes with a bevel gear 30 driven by the motor 5 .
  • An overload clutch may be integrated in the output shaft 7 .
  • the bevel gear 29 transmits a torque indirectly via a pulley on the output shaft 7. Die Disc at an increased torque of the bevel gear 29 solve, for example, by an axial deflection against a spring 31st
  • the motor 5 is oriented perpendicular to the working axis 11 , ie the motor axis 30 is perpendicular to the working axis 11.
  • the motor axis 32 is located near a plane perpendicular to the working axis 11, which passes through the impact point. The distance is less than a crank radius 25.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP14165393.1A 2014-04-22 2014-04-22 Machine-outil portative Withdrawn EP2937185A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14165393.1A EP2937185A1 (fr) 2014-04-22 2014-04-22 Machine-outil portative

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14165393.1A EP2937185A1 (fr) 2014-04-22 2014-04-22 Machine-outil portative

Publications (1)

Publication Number Publication Date
EP2937185A1 true EP2937185A1 (fr) 2015-10-28

Family

ID=50513765

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14165393.1A Withdrawn EP2937185A1 (fr) 2014-04-22 2014-04-22 Machine-outil portative

Country Status (1)

Country Link
EP (1) EP2937185A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3875225A1 (fr) * 2020-03-05 2021-09-08 Hilti Aktiengesellschaft Dispositif d'alimentation électrique pour une machine-outil

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2702128A1 (de) * 1977-01-20 1978-07-27 Metabowerke Kg Motorisch angetriebener hammer, bei dem in einem zylinder ein kolben verschiebbar gefuehrt ist
EP1674206A1 (fr) * 2004-12-23 2006-06-28 BLACK & DECKER INC. Mécanisme de percussion d'un marteau à percussion à moteur
US20100012337A1 (en) 2006-12-14 2010-01-21 Gerhard Meixner Percussive mechanism of an electric hand-held machine tool

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2702128A1 (de) * 1977-01-20 1978-07-27 Metabowerke Kg Motorisch angetriebener hammer, bei dem in einem zylinder ein kolben verschiebbar gefuehrt ist
EP1674206A1 (fr) * 2004-12-23 2006-06-28 BLACK & DECKER INC. Mécanisme de percussion d'un marteau à percussion à moteur
US20100012337A1 (en) 2006-12-14 2010-01-21 Gerhard Meixner Percussive mechanism of an electric hand-held machine tool

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3875225A1 (fr) * 2020-03-05 2021-09-08 Hilti Aktiengesellschaft Dispositif d'alimentation électrique pour une machine-outil
WO2021175652A1 (fr) * 2020-03-05 2021-09-10 Hilti Aktiengesellschaft Dispositif d'alimentation en énergie destiné à une machine-outil

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