EP3181302A1 - Machine-outil portative - Google Patents

Machine-outil portative Download PDF

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Publication number
EP3181302A1
EP3181302A1 EP15199869.7A EP15199869A EP3181302A1 EP 3181302 A1 EP3181302 A1 EP 3181302A1 EP 15199869 A EP15199869 A EP 15199869A EP 3181302 A1 EP3181302 A1 EP 3181302A1
Authority
EP
European Patent Office
Prior art keywords
spindle
tool
working axis
rotary drive
hand tool
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Withdrawn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
EP15199869.7A
Other languages
German (de)
English (en)
Inventor
Erwin Manschitz
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 EP15199869.7A priority Critical patent/EP3181302A1/fr
Publication of EP3181302A1 publication Critical patent/EP3181302A1/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Withdrawn legal-status Critical Current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
    • 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
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/231—Sleeve details

Definitions

  • the present invention relates to a hand tool machine which superimposes a rotational movement of a tool holder on a periodically striking striking mechanism.
  • the most common drill like from the US 4,565,472 A known, has a tool head made of hard metal and a transport spiral, which promotes the cuttings from the well.
  • Other drills eg as from the US 6,065,908 A known, instead of a transport spiral, a hollow shaft over which the cuttings are sucked by means of a pump.
  • the drill head is essentially the same as in the case of the drills with the transport helix.
  • the drills can be used in hand tool machines, such as US 4,732,219 A , are used, which drill a hole in the rock with a superimposed impact and rotation. The drill is rotated between two strokes between 30 degrees and 75 degrees to achieve a high degradation rate.
  • a hand tool machine has a tool holder for holding a striking and rotating tool on a working axis, an electric motor, a striking mechanism, and a rotary actuator.
  • the hammer mechanism has a racket that moves periodically along the working axis.
  • the rotary drive drives a spindle carrying the tool holder in rotation about the working axis.
  • the rotary drive is synchronized with the percussion mechanism so that the spindle is rotated within a period of the racket by a conversion angle in the range between 1 degree and 10 degrees.
  • the low conversion angle proves to be advantageous when drilling with a drill with a hollow shank.
  • Fig. 1 shows a hammer drill 1 as an example of a beating hand-held machine tool.
  • the hammer drill 1 has a tool holder 2 in which coaxial with a working axis 3, a drill, chisel or other beating tool 4 can be used and locked.
  • the hammer drill 1 has a pneumatic impact mechanism 5 , which can exert periodic punches in a direction of impact 6 on the tool 4 .
  • a rotary drive 7 can rotate the tool holder 2 continuously about the working axis 3 .
  • the pneumatic hammer 5 and the rotary drive are driven by an electric motor 8 , which is fed from a battery 9 or a power line with electric current.
  • 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.
  • the tool holder 2 is attached to a spindle 13 of the rotary drive 7 .
  • the tool holder 2 can rotate relative to the machine housing 10 about the working axis 3 .
  • Claws or other suitable means in the tool holder 2 transmit torque from the tool holder 2 to the tool 4
  • the pneumatic impact mechanism 5 has along the direction of impact 6 a pathogen 14 , a racket 15 and a striker 16th
  • the exciter 14 is forced by means of the electric motor 8 to a periodic movement along the working axis 3 .
  • the exciter 14 is connected via a transmission component 14 for converting the rotational movement of the electric motor 8 in a periodic, translational movement along the working axis 3 .
  • An exemplary transmission component 17 includes an eccentric wheel or a swash plate.
  • a period of the translatory movement of the exciter 14 is predetermined by the rotational speed of the electric motor 8 and possibly a reduction ratio in the transmission component 17 .
  • the racket 15 couples via an air spring to the movement of the exciter 14 .
  • the air spring is formed by a closed between the exciter 14 and the racket 15 pneumatic chamber 18 .
  • the racket 15 moves in the direction of impact 6 until the racket 15 strikes the striker 16 .
  • the striker 16 abuts the tool 4 in the direction of impact 6 and transmits the impact to the tool 4 .
  • the period of movement of the bat is identical to the period of movement of the agent 14 .
  • the racket 15 thus strikes with a beat that is equal to the inverse of the period.
  • the operating principle of the air spring sets tight limits for the period or the stroke rate, since the efficiency of the pneumatic coupling is dependent on a substantially resonant excitation.
  • the bat 15 typically no longer follows the movement of the pathogen 14 .
  • the optimum stroke rate is predetermined by the mass of the racket 15 and the geometric dimensions of the pneumatic chamber 18 .
  • An optimal beat number is in the range between 25 Hz and 100 Hz.
  • the exemplary striking mechanism 5 has a piston-shaped exciter 14 and a piston-shaped racket 15 , which are guided by a guide tube 19 along the working axis 3 .
  • the exciter 14 and the racket 15 abut with their lateral surfaces on the inner surface of the guide tube 19 .
  • the pneumatic chamber 18 is through the exciter 14 and the Bat 15 completed along the working axis 3 and through the guide tube 19 in the radial direction. Sealing rings in the surfaces of exciter 14 and racket 15 can improve the airtightness of the pneumatic chamber 18 .
  • the rotary drive 7 includes the spindle 13, which is arranged coaxially to the working axis 3 .
  • the spindle 13 is hollow, for example, and the striking mechanism 5 is disposed within the spindle.
  • the tool holder 2 is placed on the spindle 13 .
  • the tool holder 2 can be releasably or permanently connected to the spindle 13 via a locking mechanism.
  • the spindle 13 is connected via a reduction gear 20 to the electric motor 8 .
  • the rotational speed of the spindle 13 is less than the rotational speed of the electric motor eighth
  • the spindle 13 preferably rotates periodically.
  • the spindle 13 may be continuously rotated via the reduction gear 20 at a speed of less than 20 revolutions per minute (RPM).
  • the percussion mechanism 5 strikes superimposed on the rotational movement periodically with a stroke rate of more than 5 beats per second on the tool.
  • a conversion angle of the tool 4 between two strokes is preferably less than 10 degrees, for example less than 5 degrees, preferably more than 1 degree.
  • the conversion angle is significantly lower than the typical 30 degrees, which are used in drills with a transport helix.
  • the hammer drill 1 may include a selector switch 21 for selecting various modes of operation.
  • the exemplary selector switch 21 has a first switching position for chiselling with a suction drill and a second switching position for chiseling with a drill with conveyor spiral and on.
  • the selector switch 21 may also have a switch position for a clean chisel with deactivated rotary drive 7 and a switch position for pure drilling with deactivated impact mechanism 5 .
  • the spindle 13 may be rigidly coupled to the electric motor 8 .
  • a rotational movement of the electric motor 8 forces a rotational movement of the spindle 13 .
  • no clutches are provided in the rotary drive 7 , which could interrupt a transmission of torque from the electric motor 8 to the spindle 13 .
  • Fig. 2 shows a hammer drill 22.
  • the hammer drill 22 has as indicated by the reference numerals the same or similar components as the hammer drill 1 of Fig. 1 ,
  • the rotary drive 7 is based on a converter 23 which rotates a spindle 24 stepwise about the working axis 3 . The transfer takes place synchronously with the movement of the striking mechanism 5.
  • the conversion angle between two successive beats is in the range of 1 degree and 10 degrees.
  • the exemplary converter 23 has a sleeve 25 moved by the transmission component 17 along the working axis 3.
  • the sleeve 25 can be moved back and forth with the stroke rate.
  • the sleeve 25 is connected via a pin 26 with the exciter 14 , the transmission component 17 , etc.
  • the sleeve 25 overlaps with the spindle 24.
  • the spindle 24 has an embossed slide 27 into which one or more fingers 28 of the sleeve 25 engage ( Fig. 3 ).
  • the exemplary gate 27 has a rising in the direction of impact 6 against the circumferential direction first guide 29th
  • the pin 28 slides along the guide 29 when the sleeve 25 is advanced in the direction of impact 6 , and thereby displaces the spindle 24 in the circumferential direction 30.
  • the gate 27 has a counter to the direction of impact 6 against the circumferential direction rising second guide 31, which with a End of the previous first guide 29 overlaps.
  • FIG. 3 shows an exemplary backdrop 27 with seven pairs of the first guide 30 and the second guide 31.
  • the converter 23bz is illustrative of other converters 23bz which turn the spindle 13bz abruptly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP15199869.7A 2015-12-14 2015-12-14 Machine-outil portative Withdrawn EP3181302A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15199869.7A EP3181302A1 (fr) 2015-12-14 2015-12-14 Machine-outil portative

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15199869.7A EP3181302A1 (fr) 2015-12-14 2015-12-14 Machine-outil portative

Publications (1)

Publication Number Publication Date
EP3181302A1 true EP3181302A1 (fr) 2017-06-21

Family

ID=54936792

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15199869.7A Withdrawn EP3181302A1 (fr) 2015-12-14 2015-12-14 Machine-outil portative

Country Status (1)

Country Link
EP (1) EP3181302A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3789161A1 (fr) * 2019-09-06 2021-03-10 Hilti Aktiengesellschaft Machine-outil manuelle
EP3789162A1 (fr) 2019-09-04 2021-03-10 Hilti Aktiengesellschaft Entraînement rotatif pour une machine-outil mainuelle
EP3845340A1 (fr) * 2019-08-19 2021-07-07 Hilti Aktiengesellschaft Machine-outil, outil et système de machine-outil à un certain rapport de vitesse de rotation et de fréquence de percussion

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1652525A1 (de) * 1968-03-16 1971-04-08 Tornado Gmbh Schlagbohrmaschine
DE3142740A1 (de) * 1980-11-06 1982-06-09 Hilti AG, 9494 Schaan Schlagbohrmaschine
US4565472A (en) 1981-11-11 1986-01-21 Hilti Aktiengesellschaft Drill for hand-held drilling devices
US4732219A (en) 1985-11-02 1988-03-22 Hilti Aktiengesellschaft Hammer drill with pneumatically driven percussion piston
EP0764502A1 (fr) * 1995-09-20 1997-03-26 HILTI Aktiengesellschaft Appareil manuel de perçage assisté par percussion
US6065908A (en) 1998-03-10 2000-05-23 Hilti Aktiengesellschaft Drill

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1652525A1 (de) * 1968-03-16 1971-04-08 Tornado Gmbh Schlagbohrmaschine
DE3142740A1 (de) * 1980-11-06 1982-06-09 Hilti AG, 9494 Schaan Schlagbohrmaschine
US4565472A (en) 1981-11-11 1986-01-21 Hilti Aktiengesellschaft Drill for hand-held drilling devices
US4732219A (en) 1985-11-02 1988-03-22 Hilti Aktiengesellschaft Hammer drill with pneumatically driven percussion piston
EP0764502A1 (fr) * 1995-09-20 1997-03-26 HILTI Aktiengesellschaft Appareil manuel de perçage assisté par percussion
US6065908A (en) 1998-03-10 2000-05-23 Hilti Aktiengesellschaft Drill

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022012786A1 (fr) * 2019-08-19 2022-01-20 Hilti Aktiengesellschaft Outil électrique portatif, outil et système d'outil électrique portatif ayant un rapport vitesse/force d'impact déterminé
EP3845340A1 (fr) * 2019-08-19 2021-07-07 Hilti Aktiengesellschaft Machine-outil, outil et système de machine-outil à un certain rapport de vitesse de rotation et de fréquence de percussion
EP3854532A1 (fr) * 2019-08-19 2021-07-28 Hilti Aktiengesellschaft Machine-outil, outil et système de machine-outil à un certain rapport de vitesse de rotation et de puissance de percussion
WO2022012785A1 (fr) * 2019-08-19 2022-01-20 Hilti Aktiengesellschaft Outil électrique portatif, outil et système d'outil électrique portatif comportant un certain rapport vitesse de rotation/fréquence de frappe
EP3789162A1 (fr) 2019-09-04 2021-03-10 Hilti Aktiengesellschaft Entraînement rotatif pour une machine-outil mainuelle
WO2021043612A1 (fr) 2019-09-04 2021-03-11 Hilti Aktiengesellschaft Entraînement rotatif pour machine-outil portative
US20220288760A1 (en) * 2019-09-04 2022-09-15 Hilti Aktiengesellschaft Rotary drive for a hand-held power tool
CN113950392A (zh) * 2019-09-04 2022-01-18 喜利得股份公司 用于手持式动力工具的旋转驱动件
WO2021043888A1 (fr) * 2019-09-06 2021-03-11 Hilti Aktiengesellschaft Machine-outil portative
CN113966262A (zh) * 2019-09-06 2022-01-21 喜利得股份公司 手持式动力工具
US20220288759A1 (en) * 2019-09-06 2022-09-15 Hilti Aktiengesellschaft Hand-held power tool
EP3789161A1 (fr) * 2019-09-06 2021-03-10 Hilti Aktiengesellschaft Machine-outil manuelle
US11945085B2 (en) * 2019-09-06 2024-04-02 Hilti Aktiengesellschaft Hand-held power tool

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