EP2027972A1 - Machine-outil avec entraînement linéaire alternatif - Google Patents

Machine-outil avec entraînement linéaire alternatif Download PDF

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Publication number
EP2027972A1
EP2027972A1 EP08104550A EP08104550A EP2027972A1 EP 2027972 A1 EP2027972 A1 EP 2027972A1 EP 08104550 A EP08104550 A EP 08104550A EP 08104550 A EP08104550 A EP 08104550A EP 2027972 A1 EP2027972 A1 EP 2027972A1
Authority
EP
European Patent Office
Prior art keywords
lifting body
hand tool
lifting
stop
spring
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
EP08104550A
Other languages
German (de)
English (en)
Other versions
EP2027972B1 (fr
Inventor
Günter Haas
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 EP2027972A1 publication Critical patent/EP2027972A1/fr
Application granted granted Critical
Publication of EP2027972B1 publication Critical patent/EP2027972B1/fr
Not-in-force 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
    • 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
    • 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
    • B25D17/24—Damping the reaction force
    • 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
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/21—Metals
    • B25D2222/42—Steel
    • 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
    • B25D2250/085—Elastic behaviour of tool components
    • 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

Definitions

  • the invention relates to a hand-held power tool with linear actuator for a tool referred to in the preamble of claim 1.
  • Such hand tool are z. B. as chisel or combi hammer or as lifting saws, such as. B. saber saws formed.
  • a hand tool machine which comprises a housing arranged in a lifting drive with a percussion and with a motor which is connected via a gear with the hammer mechanism in drive connection.
  • the percussion mechanism has an eccentric and an excitation piston connected to the eccentric via a lifting body designed as a connecting rod.
  • the connecting rod has a first part, which is connected to the eccentric, and a second part, which is connected to the exciter piston. Between the first part and the second part, a coil spring for damping the vibrations arising during operation is arranged.
  • the present invention has for its object to further improve the damping in hand-held power tools with lifting drive.
  • the lifting body is formed as a one-piece, at least partially resilient body.
  • the elastic regions are in particular designed as spring sections.
  • the lifting body at least in one of the directions of a pulling direction and a pressing direction of the lifting body on a spring action, so that the damping is limited to the direction in which act the higher forces or shocks.
  • the lifting body is designed as a connecting rod, in which two bearing eyes are connected to each other via at least one arcuate spring portion.
  • a connecting rod can be inexpensively, z. B. as an injection molded part or as a stamped part.
  • the lifting body has a first stop cooperating with at least one first bearing eye as the first counter-stop for limiting a spring travel extending along the longitudinal extension of the lifting body in the direction of pressure.
  • This makes it possible to provide the damping, especially in the first part of a movement of the lifting body in the printing direction, ie until the first counter-stop is applied to the first stop during a movement in the printing direction.
  • the spring rate is designed so that these are slightly damped when high loads occur. The damping of the load peaks also protects the gearbox.
  • the first stop is arranged on a rod element connected to the second bearing eye.
  • the lifting body has a second stop cooperating with at least one arcuate spring section as the second counter-stop for limiting a spring travel extending along the longitudinal extent of the lifting body in the pulling direction.
  • This makes it possible to provide the damping, especially in the first part of a movement of the lifting body in the pulling direction, ie until the second counter-stop is applied to the second stop in a movement in the pulling direction.
  • the spring rate is designed so that these are slightly damped when high loads occur. The damping of the load peaks also protects the gearbox.
  • the second stop is arranged on the rod bearing element connected to the second bearing eye.
  • the lifting body is designed as a lifting rod, which has at least one elongated hole for the engagement of the eccentric pin, wherein at least a first longitudinal side of the oblong hole is formed by a first spring arm.
  • a lifting rod can be provided, which as an integral element has an integrated damping in at least one direction from the direction of tension and compression.
  • a second longitudinal side of the slot formed by a second spring arm, whereby a damped in both the compression and in the tension direction of the lifting rod is generated.
  • a first stop for the first spring arm for limiting a along the longitudinal extent of the lifting body extending in the direction of pressure spring travel is provided. This makes it possible to provide the damping, especially in the first part of a movement of the lifting body in the printing direction, ie until the first spring arm applies to the first stop during a movement in the printing direction.
  • the spring rate is designed so that when high loads occur these are slightly damped. The damping of the load peaks also protects the gearbox.
  • a second stop for the second spring arm for limiting a along the longitudinal extension of the lifting body in the pulling direction extending spring travel is provided. This makes it possible to provide the damping, especially in the first part of a movement of the lifting body in the pulling direction, ie until the second spring arm rests against the second stop during a movement in the pulling direction.
  • the spring rate is also designed so that the occurrence of high loads these are somewhat damped. The damping of the load peaks also protects the gearbox.
  • the lifting body consists at least partially of a spring steel, whereby a long life of the elastically stressed spring portions of the lifting body and the lifting body is achieved per se.
  • FIG. 1 is designed as a rotating and hammering combi hammer hand tool 10 is shown, which has a housing 11 in which a total of 13 designated lifting drive for an arrangeable in a tool holder 14 tool 15 is arranged.
  • the power tool 10 also has a rotary drive for the tool 15, which is not shown in detail in the figures.
  • the lifting drive 13 comprises a striking mechanism 20 acting on the tool 15, a gear 19 and a motor 12.
  • the hammer mechanism 20 is coupled via a not visible in the figures output shaft with the gear 19, which translates a rotational movement of the motor 12 and the output shaft on one of the Figures 2 .
  • 3a and 3b apparent eccentric 17 transmits, which is displaceable in rotation in a direction of rotation 16 (see FIGS. 3a and 3b ).
  • the striking mechanism 20 of the lifting drive 13 is shown in more detail.
  • the percussion mechanism 20 has a guide tube 21, in which a exciter element 22 designed as an exciter piston is guided to be moved back and forth.
  • the guide tube 21 may be formed in two or more parts to simplify the assembly.
  • the exciter element 22 is connected to the eccentric wheel 17 by means of a lifting body 30, which is mounted pivotably on the lifting body 30 and is designed as a connecting rod 31 in order to generate a lifting movement during operation of the handheld power tool 10.
  • the connecting rod 31 is connected via an eccentrically arranged on the eccentric 17 eccentric pin 18 with this, whereby a rotational movement of the eccentric 17 in the direction of rotation 16 is transformed into an oscillating stroke movement of the excitation element 22.
  • the connecting rod 31 is connected via a bearing pin 26 pivotally connected to the excitation element 22.
  • a striker 24 and an impact element 23 designed as a flying piston are furthermore mounted so as to be axially displaceable.
  • the striking element 23 is also displaceable via the excitation piston and the air spring 25 located between it and the excitation element 22 in an oscillating stroke movement.
  • the striking element 23 strikes in the impact mode of the power tool 10 on the striker 24, which in turn on the tool 15 (off Fig. 1 ) suggests.
  • the striking element 23 strikes directly on the end of a tool.
  • the air spring 25 or gas spring (depending on the used gas or gas mixture) between the exciter element 22 and the striking element 23 can be switched on and off via switching means (not shown in the figures).
  • the lifting rod 30 formed as a connecting rod 30 is itself formed resilient and consists of a spring steel or plastic.
  • the two bearing eyes 33, 34 are connected to each other via arcuate spring portions 35.
  • at least the first bearing eye 33 forms a counter stop for a first stop 36, which is arranged at a free end of a rod element 37 extending along a longitudinal extent L of the connecting rod 31 and centrally extending in the connecting rod 31.
  • the rod member 37 is connected to the second bearing eye 34 of the connecting rod and runs centrally between the two arcuate spring portions 35.
  • the two spring portions 35 form counter stops for second stops 38, which are arranged approximately centrally on both sides of the rod member 37 at this.
  • both the first stop 36 and the associated counter-stop on the first bearing eye 33 as well as the second stops 38 and the associated counter-stops on the arcuate spring portions 35 are spaced from each other.
  • the distance between the stop 36 and the counter-stop on the first bearing eye 33 in the rest position defines the maximum spring travel along the longitudinal extension L of the connecting rod 31 or of the lifting body 30 in a pressure direction 52 FIG. 3a the hand tool 10 is in operation, wherein the eccentric 17 rotates in the direction of arrow 16.
  • the eccentric pin 18 pushes the connecting rod 31 straight in the pressure direction 52, whereby the connecting rod 31 has been elastically shortened while damping the movement, until the first stop 36, as shown, rests on the counter stop on the first bearing eye 33.
  • the distances between the stops 38 and the counterstops of the arcuate spring portions 35 in the rest position define the maximum spring travel along the longitudinal extent L of the connecting rod 31 and the lifting body 30 in a pulling direction 51.
  • the hand tool 10 is in operation, wherein the eccentric 17 rotates in the direction of arrow 16.
  • the eccentric pin 18 draws the connecting rod 31 straight in the pulling direction 51, wherein the connecting rod 31 was stretched elastically under damping of the movement until the second stops 38, as shown, rested against the counterstops on the arcuate spring sections 35.
  • FIG. 4 an inventive, designed as a saber saw hand tool 10 is shown.
  • This has a lifting drive 13 with an inventive, designed as a connecting rod lifter 30, which already in the Figures 1 to 3b
  • an inventive, designed as a connecting rod lifter 30 which already in the Figures 1 to 3b
  • the difference from the hand tool described above lies in the fact that the connecting rod 31 of the saber saw with its first bearing eye 33 is in connection with a lifting element 27, which forms a tool holder 14 for a saw blade, not shown in the figure, and not with an exciter element of a striking mechanism.
  • FIG. 5 another inventive, designed as a saber saw hand tool 10 is shown.
  • This has a lifting drive 13 with an inventive, designed as a lifting rod 32 lifting body 30.
  • the lifting rod is firmly connected to the, the tool holder 14 for a saw blade bearing lifting element 27.
  • the lifting rod 32 is formed as a flat component made of spring steel and has at its end remote from the lifting element 27 a slot 40 which extends transversely to the longitudinal extent L of the lifting rod 32. In the slot 40 of the eccentric pin 18 of the eccentric 17 engages, so that the lifting rod 32 is displaceable in a reciprocating motion when the motor (not visible in the figure) of the lifting drive 13 is turned on.
  • a first spring arm 43 is formed, which runs parallel to the longitudinal axis A of the elongated hole 40 in the illustrated rest state of the lifting drive 13, and over about 70 - 90% of the axial length of the elongated hole 40 extends.
  • the spring travel of the first spring arm 43 is limited by a first stop 36, which may consist of a different material as the lifting rod 32 and which may be fixed to this. If the lifting rod 32 is acted upon by the eccentric pin 18 in the pressure direction 52, the transmission of the movement from the eccentric pin 18 to the lifting rod is resiliently damped by the first spring arm 43 deflecting in the direction of compression 52 up to the first stop 36.
  • a second spring arm 44 is formed, which runs parallel to the longitudinal axis A of the elongated hole 40 in the illustrated rest state of the lifting drive 13, and over about 70 - 90% of the axial length of the elongated hole 40 extends.
  • the spring travel of the second spring arm 44 is limited by a second stop 38, which consists of a may consist of other material such as the lifting rod 32 and which may be fixed to this. If the lifting rod 32 is acted upon by the eccentric pin 18 in the pulling direction 51, then the transmission of the movement from the eccentric pin 18 to the lifting rod 32 is resiliently damped by the second spring arm 44 deflecting in the pulling direction 51 to the second stop 38.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP20080104550 2007-08-20 2008-06-26 Machine-outil avec entraînement linéaire alternatif Not-in-force EP2027972B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710000452 DE102007000452A1 (de) 2007-08-20 2007-08-20 Handwerkzeugmaschine mit Hubantrieb

Publications (2)

Publication Number Publication Date
EP2027972A1 true EP2027972A1 (fr) 2009-02-25
EP2027972B1 EP2027972B1 (fr) 2011-09-07

Family

ID=39767109

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080104550 Not-in-force EP2027972B1 (fr) 2007-08-20 2008-06-26 Machine-outil avec entraînement linéaire alternatif

Country Status (2)

Country Link
EP (1) EP2027972B1 (fr)
DE (1) DE102007000452A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2944428A1 (fr) * 2014-05-16 2015-11-18 Makita Corporation Outil d'impact

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012206451B4 (de) * 2012-04-19 2020-12-10 Hilti Aktiengesellschaft Handwerkzeugmaschine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1044297A (fr) * 1951-10-30 1953-11-16 Marteau perforateur
US3063508A (en) * 1959-07-06 1962-11-13 Albert R Henry Pavement breaking drill
NL7316810A (fr) 1972-12-09 1974-06-11
FR2458362A1 (fr) * 1979-06-05 1981-01-02 Sauer Transmissions Marteau alternatif, notamment de battage ou de forage
DE10348514B3 (de) 2003-10-18 2005-02-17 Hilti Ag Handwerkzeugmaschine mit einem Schlagwerk mit zweiteiligem Pleuel

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2181693B (en) * 1985-09-27 1989-05-10 Black & Decker Inc Improvements in and relating to power tools
JP2000205239A (ja) * 1999-01-12 2000-07-25 Mitsuhiro Kanao ノック振動騒音の防止方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1044297A (fr) * 1951-10-30 1953-11-16 Marteau perforateur
US3063508A (en) * 1959-07-06 1962-11-13 Albert R Henry Pavement breaking drill
NL7316810A (fr) 1972-12-09 1974-06-11
FR2458362A1 (fr) * 1979-06-05 1981-01-02 Sauer Transmissions Marteau alternatif, notamment de battage ou de forage
DE10348514B3 (de) 2003-10-18 2005-02-17 Hilti Ag Handwerkzeugmaschine mit einem Schlagwerk mit zweiteiligem Pleuel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2944428A1 (fr) * 2014-05-16 2015-11-18 Makita Corporation Outil d'impact

Also Published As

Publication number Publication date
DE102007000452A1 (de) 2009-02-26
EP2027972B1 (fr) 2011-09-07

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