DE102010029560A1 - Hand-held power tool for a blade tool - Google Patents

Hand-held power tool for a blade tool

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Publication number
DE102010029560A1
DE102010029560A1 DE201010029560 DE102010029560A DE102010029560A1 DE 102010029560 A1 DE102010029560 A1 DE 102010029560A1 DE 201010029560 DE201010029560 DE 201010029560 DE 102010029560 A DE102010029560 A DE 102010029560A DE 102010029560 A1 DE102010029560 A1 DE 102010029560A1
Authority
DE
Germany
Prior art keywords
power tool
hand
unit
held power
blade
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.)
Pending
Application number
DE201010029560
Other languages
German (de)
Inventor
Hans-Peter Grabsch
Thilo Koeder
Jochen ROSER
Ivan Spremo
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE201010029560 priority Critical patent/DE102010029560A1/en
Publication of DE102010029560A1 publication Critical patent/DE102010029560A1/en
Application status is Pending legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25FCOMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02Construction of casings, bodies or handles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25FCOMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F3/00Associations of tools for different working operations with one portable power-drive means; Adapters therefor

Abstract

The invention relates to a hand-held power tool (10) for a blade tool (60) comprising
A housing (20) having a grip area (40) and an actuating unit (30) for activating the power tool (10) and / or a working movement,
- An electronics unit (200) arranged in the housing (20) for charging the drive unit (80) with at least control and / or control signals, which is supplied by a in the housing (20) operating voltage unit (90) with a DC electrical voltage,
- In the housing (20) arranged drive unit (80) for generating a working movement of the blade tool (60), wherein the drive unit (80) comprises at least one piezoelectric or magnetostrictive actuator (100) having a piezoelectrically or magnetostrictive material excitable material, and
- A receptacle (50) for a replaceable blade tool (60) with a change mechanism for attaching and detaching the replaceable blade tool (60).

Description

  • State of the art
  • The invention relates to a hand-held power tool for a blade tool with a housing and a piezoelectric or magnetostrictive actuator.
  • Known ultrasonic powered hand held power tools, such as electric cutters, consist of a typically mains operated generator with drive electronics and a handheld unit with a knife connected to the generator by a cable. The generator is usually designed as a tabletop device.
  • Disclosure of the invention
  • A hand-held power tool for a blade tool is proposed. The power tool includes a housing having a handle portion and an actuating unit for activating the power tool and / or a working movement; an electronic unit arranged in the housing for acting upon the drive unit with at least control and / or regulating signals which are supplied with an electrical DC voltage by an operating voltage unit arranged in the housing; a drive unit arranged in the housing for producing a working movement of the blade tool, wherein the drive unit comprises at least one piezoelectrically or magnetostrictively operating actuator with a volume of piezoelectrically or magnetostrictively activatable material; and a receptacle for a replaceable blade tool with a change mechanism for attaching and detaching the replaceable blade tool.
  • The proposed power tool is a handy one-piece device, can be dispensed with disturbing connection cable between separate housing parts. The power tool can be operated in particular cordless with batteries or rechargeable batteries. Optionally, it may be - additionally or alternatively - operable or rechargeable with mains power via a mains cable. The blade tool is an insertion tool, which is detachably connected to the actuator, preferably via a coupling element in the form of a sonotrode.
  • The connection may in particular be positive or non-positive. One or more blades may be formed laterally and / or frontally on the blade tool. The grip region of the housing can advantageously be ergonomically shaped.
  • According to a favorable development, the receptacle can be coupled to the drive unit with a coupling element, preferably arranged in the coupling element. The coupling element, for. B. a sonotrode, may have an opening into which the blade tool can be inserted. The blade tool can when inserting z. B. latch when it is in the correct position. The blade tool can be fixed alternatively or additionally with a safety pin in the opening. Also conceivable is a chuck for holding the blade tool. The opening for receiving the replaceable blade tool can also be a slot in which the inserted blade tool can be clamped.
  • According to a favorable development, the receptacle can be provided for holding different blade tools that fulfill different machining tasks. The blade tools can z. B. for cutting, scraping, planing, sawing or polishing. The blade tool may be partially or entirely coated with an abrasion layer, such as a hard material or diamond. With the Abrasionsschicht can, depending on the graininess of the abrasion layer, for. As a surface removed or polished.
  • Advantageously, the grip area can be made non-slip towards the blade tool and / or the blade tool can be protected with a cover against unintentional intervention. As a result, the reliability of the power tool can be improved and the handling can be facilitated.
  • Conveniently, at least the drive unit, the electronics unit and the operating voltage unit can be distributed in the housing such that a center of mass of the power tool lies close to the handle area. The handling of the power tool is facilitated, the work result can be better controlled.
  • Particularly compact, the power tool can be performed when the electronics unit is concentrated on a circuit board. If the operating frequency of the at least one actuator in the range between 10 kHz and 1000 kHz, preferably between 30 kHz and 50 kHz, in particular between 35 kHz and 45 kHz, the space required for the actuator can be reduced. It can be achieved a favorable ratio of power and volume and thus weight.
  • Advantageously, the operating voltage unit may comprise an electrochemical store, preferably a rechargeable electrochemical store. The memory can be interchangeable and z. B. in an external charging station getting charged. However, it is also conceivable that the memory can be loaded in the power tool. An electrical output voltage of the operating voltage unit may be at supply with electrochemical storage between 3 volts to 100 volts DC, preferably in the range of 3.5 V to 40 V, in particular at a value of 36 volts, 24 volts, 18 volts, 14.4 volts , 12 volts, 10.6 volts, 7.2 volts and / or 3.6 volts. Battery packs or rechargeable battery packs which are small and light enough to still ensure good handleability of the power tool with high output power can advantageously be used as the electrochemical store. Favorable here are systems based on z. As lithium-ion (Li-ion) or nickel-metal hydride (NiMeH), nickel-cadmium (NiCd) or lead and the like.
  • A particularly good power yield in a small space can be achieved if the electronic unit is designed to operate the at least one actuator in a resonant frequency and the electronic unit comprises a control unit with frequency adjustment for tracking the resonant frequency of the at least one actuator. If the actuator is operated at its resonant frequency, a high mechanical output power can be delivered if the quality of the oscillating system is sufficiently high in accordance with an electrical input power. Conveniently, the electronic unit can be designed so that the resonance frequency can be tracked during operation of the power tool. The actuator may be an ultrasonic actuator, in particular a piezoelectric actuator in the construction of a Langevin oscillator. The piezoelectric actuator has piezoelectric material as excitation-active material. Typically, the quality of the undamped oscillatory system is greater than 100, typically greater than 500. The resonant system of the actuator having the resonant frequency includes the Langevin transducer with piezoelectric active material and components coupled to the vibrator, particularly components that amplify the ultrasound and / or transferred to a processing location. Such components are for. B. known as a booster or sonotrode. This enables a size reduction and the provision of a compact device. Advantageously, a compact power tool of high performance is thus created, which is at the same time handy. It can also be several actuators, z. B. with the same or with different resonant frequency, may be provided as a drive component. Alternatively, one or more further drive components, such as an electric motor, may be provided. The various drive components may be operated alternatively or in combination.
  • Conveniently, according to a further embodiment, one or more optical and / or acoustic and / or haptic operating shots for an activated state of the at least one actuator and / or a working field illumination can be provided.
  • Advantageously, for a hand-held power tool, the volume of the piezoelectrically active material may be at least 0.2 cm 3 , preferably at least 0.5 cm 3 , in particular at least 1 cm 3 . Advantageously, a sufficient ultrasonic power can be achieved with a small size of the actuator. The at least one actuator may in this case, a power density of at least 5 watts / cm 3, preferably obtained from at least 20 watts / cm 3, the volume of the piezo-electrically active material of the at least one actuator. A correspondingly high power density is advantageous for a hand-held compact power tool with the smallest possible dimensions and low production costs. It is also advantageous for compact dimensions if a maximum electrical excitation field strength of the at least one actuator is in the range below 300 V / mm (based on the thickness, in particular slice thickness, of the piezoelectrically active material), preferably in the range between 50 V / mm and 220 V / mm. With a disk thickness of the actuator of typically 1 mm to 10 mm, preferably 2 mm to 6 mm, in particular by 5 mm, the electrical voltages are less than 1000 volts. On the input side of the electronic unit can be at least 20 watts of electrical power to act on the at least one actuator. Advantageously, a sufficient power for a power tool can be ensured. Usual benefits are in the home improvement sector, for small cutting systems about between 20 watts and 250 watts, preferably 50 watts to 150 watts. Nevertheless, a power tool with handy dimensions can be created, which can be included or held by the hand of the operator on the one hand and on the other hand provides sufficient power for processing.
  • It is conceivable that the drive unit comprise at least one further drive component in addition to the at least one actuator. Advantageously, the working movement of a tool driven by the at least one further drive component can be superimposed by a movement generated by the at least one actuator, whereby the work progress can be significantly improved and the machining can be facilitated.
  • drawing
  • Further advantages emerge from the following description of the drawing. In the drawing Embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.
  • They show by way of example:
  • 1 a first embodiment of a hand-held power tool with an elongated housing with a replaceable blade tool;
  • 2 another embodiment of a hand-held power tool with a T-shaped housing with a replaceable blade tool;
  • 3 a schematic diagram of a receptacle for a replaceable blade tool;
  • 4a - 4f Various blade tools for a handheld power tool with a replaceable blade tool.
  • Embodiments of the invention
  • In the figures, the same or similar components are numbered with the same reference numerals.
  • To illustrate the invention show the 1 and 2 various examples of hand-held power tools 10 with interchangeable blade tool 60 , 1 shows a hand-held power tool 10 with elongated housing shape; 2 shows a hand-held power tool 10 with T-shaped housing.
  • The hand-held power tool 10 includes a housing 20 with a grip area 40 , An operator holds the power tool 10 at the grip area 40 or includes the grip area by hand and can the power tool 10 lead safely.
  • The grip area 40 may optionally be decoupled with a damping element, not shown, with respect to other housing areas. The power tool 10 further includes a tool area 50 for the linear and / or oscillating drivable blade tool 60 such as a knife or other blade tool.
  • A housing-side control panel 30 Used for user-side activation of the blade tool 60 and / or the power tool 10 , The control panel 30 can z. B. be a switch or a controller or include several controls, of which z. B. one for turning on the power tool 10 and one for turning on and / or controlling the blade tool 60 can be provided.
  • In the case 20 is a drive unit 80 arranged in the examples according to 1 and 2 only one drive component is covered by an actuator 100 is formed. This can be designed as a piezo-excited Langevin oscillator (also called a piezoactuator), which is a volume of piezoelectrically active material 102 includes, for. B. piezoceramic discs, which are stacked and compressed in a stacking direction and perform a change in length when exposed to electrical voltage. When exposed to high-frequency electrical voltage ultrasound is generated in a conventional manner, via a coupling element 106 to the blade tool 60 is directed. The coupling element 106 may be a known sonotrode. The length and shape as well as the material of the coupling element 106 determine a resonant frequency of the actuator 100 , Also the blade tool 60 can affect the resonant frequency. In the embodiments in 1 and 2 is the actor 100 designed so that Langevin oscillator and coupling element 106 are combined in one unit, and their entire length corresponds to approximately half the wavelength λ / 2 of the ultrasonic vibration. Other variants may provide that the actuator 100 composed of several components with the length λ / 2. These can be: Vibration generator, known as a converter, in particular z. A Langevin transducer, amplitude transformation pieces 104 known as a booster, possibly extension pieces, as well as the coupling element 106 known as sonotrode.
  • The coupling element 106 has a recording 108 for the interchangeable blade tool 60 on that in 3 is described in more detail. The blade tool 60 can with a holding means 110 be securely fixed in the receptacle.
  • One in the case 20 arranged electronic unit 200 serves to pressurize the drive unit 80 with at least control and / or control signals, as well as the voltage supply of the actuator 100 , The electronics unit 200 Can save space on a single board 210 be housed ( 1 ) or on z. B. two boards 212 . 214 to be distributed ( 2 ), one in the main part and a protruding transversely from the main part grip part of the T-shaped housing 20 is arranged. Advantageously, drive unit 80 , Electronic unit 200 and operating voltage unit 90 so in the case 20 that distributes a center of gravity in the area of the grip part 40 lies.
  • An operating voltage unit 90 , here as a battery or battery pack with batteries or rechargeable batteries 92 designed, serves to provide a DC electrical voltage for the electronic unit 90 , which converts the operating voltage into a high-frequency voltage signal, with which the actuator 100 is excited to vibrate in the desired manner.
  • The electronics unit 200 is in particular designed to be the at least one actuator 100 to operate at a resonant frequency f_res. In this case, the electronic unit includes 200 a control unit 224 for tracking the resonance frequency f_res of the actuator 100 , The control unit 224 may include a phase locked loop that controls the actuator 100 can excite in the resonant frequency, wherein a phase shift between the current fed and the voltage fed to 0 ° is set. The resonance frequency f_res is preferably readjusted when the resonant frequency changes due to heating or load changes on the tool. Alternatively, a frequency tracking can be done by a maximum of the in the actuator 100 fed electricity is regulated.
  • Is the actor 100 a piezoactuator, is the volume of the piezoelectrically active material 102 , z. B. stacked piezoelectric discs, conveniently at least 0.2 cm 3 , preferably 0.5 cm 3 , in particular at least 1 cm 3 . The actor 100 may have a power density of at least 5 watts / cm 3 , preferably at least 20 watts / cm 3 , based on the volume of the piezoelectric active material 102 of the actor 100 exhibit. The power density allows use in a hand-held power tool 10 with sufficient power output of the blade tool 60 ,
  • Conveniently, the actuator 100 with the coupling element 106 low vibration in the housing 20 be stored, which is the ease of use and handling of the power tool 10 further improved.
  • The activation of the blade tool 60 through the control panel 30 can z. B. with a signal means 122 ( 2 ) to minimize the noise of the blade tool 60 to make recognizable.
  • 3 shows a schematic diagram of a detail of a possible attachment of a blade tool 60 in a recording 108 a coupling element 106 from the 1 and 2 , The blade tool 60 is with a connecting part 62 in the recording 108 taken and there with a fixing 110 fixed. The recording 108 can z. B. as a slot at the free end of the coupling element 106 be formed, and the fixing 110 can be designed as a screw. When tightening the screw becomes the blade tool 60 clamped in the slot.
  • Alternatively (not shown), the blade tool 60 also z. B. by screwing with the coupling element 106 get connected. This could be the blade tool 60 as a connecting part 62 Having a bolt with external thread in a threaded hole in the coupling element 106 can be screwed.
  • The power tool 10 may preferably be provided for this, with different blade tools 60 to work. With a basic unit different work can be done by using the appropriate blade tool 60 is used.
  • Is exemplary in the 4a - 4f a number of different blade tools 60a - 60f shown. Every blade tool 60a - 60f is with its connecting part 62 - 62f in the recording 108 the power tool 10 can be used, so that the power tool 10 can fulfill different machining tasks.
  • So shows 4a a blade tool 60a with a triangular blade, the two lateral cutting edges 64a having. 4b shows a blade tool 60b with a rectangular blade, which at the three free outer edges a circumferential cutting edge 64b having. 4c shows a toothed blade tool 60c with triangular blade with two lateral saw edges 64c , Such a blade tool 60c is suitable for. B. for processing, in particular for cutting, Rigips or other, similar soft materials. 4d shows a blade tool 60d especially for cockroach and planing with a widened edge 64d on an end face of the blade tool 60d , Depending on the angle of attack of the blade tool 60d can be scraped or planed with this. 4e shows a blade tool 60e , in some areas, preferably at the cutting edges 64e , with a hard and / or abrasive coating 66e is provided, such as a diamond coating. Such a blade tool 60e suitable for grinding or polishing, depending on the grain of the coating 66e , 4f shows a full-surface coated blade tool 60f according to a triangular blade 4a , The coating 66f can z. B. be a diamond coating. Furthermore, all shown can be a blade tools 60a - 60f be wholly or partially provided with a hardening and / or abrasive coating.

Claims (10)

  1. Hand-held power tool ( 10 ) for a blade tool ( 60 ), comprising - a housing ( 20 ) with a grip area ( 40 ) and an operating unit ( 30 ) for activating the power tool ( 10 ) and / or a working movement, - one in the housing ( 20 ) arranged electronic unit ( 200 ) for charging the drive unit ( 80 ) with at least control and / or regulating signals coming from one in the housing ( 20 ) operating voltage unit ( 90 ) is supplied with a direct electrical voltage, - in the housing ( 20 ) arranged drive unit ( 80 ) for generating a working movement of the blade tool ( 60 ), wherein the drive unit ( 80 ) at least one piezoelectric or magnetostrictive actuator ( 100 ) comprising a volume of piezoelectrically or magnetostrictively stimulable material, and 50 ) for a replaceable blade tool ( 60 . 60a - 60f ) with a change mechanism for attaching and detaching the replaceable blade tool ( 60 . 60a - 60f ).
  2. Hand-held power tool according to claim 1, wherein the receptacle ( 50 ) with a coupling element ( 106 ) with the drive unit ( 80 ) is coupled, preferably in the coupling element ( 106 ) is arranged.
  3. Hand-held power tool according to claim 1 or 2, wherein the receptacle ( 50 ) for holding different blade tools ( 60 . 60a - 60f ) is provided, which fulfill different processing tasks.
  4. Hand-held power tool according to one of the preceding claims, wherein the grip area ( 40 ) to the blade tool ( 60 . 60a - 60f ) is configured slip-proof and / or the blade tool ( 60 . 60a - 60f ) is protected with a cover against accidental intervention.
  5. Hand-held power tool according to one of the preceding claims, wherein at least the drive unit ( 80 ), the electronics unit ( 200 ) and the operating voltage unit ( 90 ) so in the housing ( 20 ) that a center of gravity of the cutting machine near the grip area ( 40 ) lies.
  6. Hand-held power tool according to one of the preceding claims, wherein the operating frequency of the at least one actuator ( 100 ) in the range between 10 kHz and 1000 kHz, preferably between 30 kHz and 50 kHz, in particular between 35 kHz and 45 kHz.
  7. Hand-held power tool according to one of the preceding claims, wherein the operating voltage unit ( 90 ) an electrochemical storage ( 92 ), preferably a rechargeable electrochemical store ( 92 ).
  8. Hand-held power tool according to one of the preceding claims, wherein the electronic unit ( 200 ) is formed to the at least one actuator ( 100 ) in a resonant frequency (f_res) and the electronics unit ( 200 ) a control unit ( 224 ) with frequency adaptation for tracking the resonance frequency (f_res) of the at least one actuator ( 100 ).
  9. Hand-held power tool according to one of the preceding claims, wherein the electronic unit ( 200 ) on a board ( 210 ) is concentrated.
  10. Hand-held power tool according to one of the preceding claims, wherein one or more optical and / or audible and / or haptic operation ( 120 . 122 ) for an activated state of the at least one actuator ( 100 ) are provided and / or a workfield lighting is provided.
DE201010029560 2010-06-01 2010-06-01 Hand-held power tool for a blade tool Pending DE102010029560A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE201010029560 DE102010029560A1 (en) 2010-06-01 2010-06-01 Hand-held power tool for a blade tool

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010029560 DE102010029560A1 (en) 2010-06-01 2010-06-01 Hand-held power tool for a blade tool
PCT/EP2011/057705 WO2011151147A1 (en) 2010-06-01 2011-05-12 Hand guided electric machine tool for a blade tool

Publications (1)

Publication Number Publication Date
DE102010029560A1 true DE102010029560A1 (en) 2011-12-01

Family

ID=44461835

Family Applications (1)

Application Number Title Priority Date Filing Date
DE201010029560 Pending DE102010029560A1 (en) 2010-06-01 2010-06-01 Hand-held power tool for a blade tool

Country Status (2)

Country Link
DE (1) DE102010029560A1 (en)
WO (1) WO2011151147A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE465211B (en) * 1990-01-10 1991-08-12 Bahco Verktyg Ab Battery powered hand tools
US5658193A (en) * 1994-04-18 1997-08-19 Wahl Clipper Corporation Reciprocating hand tool with multiple attachments
US6204592B1 (en) * 1999-10-12 2001-03-20 Ben Hur Ultrasonic nailing and drilling apparatus
US20070089301A1 (en) * 2005-10-21 2007-04-26 Arias David A Carving apparatus
US20100074700A1 (en) * 2008-09-24 2010-03-25 Icc Innovative Concepts Corporation Electric drill with high efficiency illuminator

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Publication number Publication date
WO2011151147A1 (en) 2011-12-08

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