EP1319477B1 - Electrical hand tool with axial percussion - Google Patents

Electrical hand tool with axial percussion Download PDF

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Publication number
EP1319477B1
EP1319477B1 EP02406048A EP02406048A EP1319477B1 EP 1319477 B1 EP1319477 B1 EP 1319477B1 EP 02406048 A EP02406048 A EP 02406048A EP 02406048 A EP02406048 A EP 02406048A EP 1319477 B1 EP1319477 B1 EP 1319477B1
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EP
European Patent Office
Prior art keywords
hand tool
electric hand
handgrip
tool according
force
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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.)
Expired - Lifetime
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EP02406048A
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German (de)
French (fr)
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EP1319477A1 (en
Inventor
Hans Böni
Orestis Voulkidis
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Hilti AG
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Hilti AG
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Publication of EP1319477A1 publication Critical patent/EP1319477A1/en
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    • 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
    • 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
    • B25D17/04—Handles; Handle mountings
    • B25D17/043—Handles resiliently mounted relative to the hammer housing
    • 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
    • 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
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/221—Sensors

Definitions

  • the invention refers to an at least partially axially impacting electric hand tool device such as a drill bit or chisel device for breaking down rock.
  • Performance parameters for the degradation performance are in particular the impact strength, impact frequency and optionally the speed of the impact tool.
  • Control functions of the electric hand tool device in the guide handle or auxiliary handle are arranged.
  • the control electronics of an electric hand tool device is controlled via a grinderless potentiometer with a pressure pad.
  • DE19510365 is arranged in such a grinderless potentiometer in the actuator between the pressure plate and the sensor, a compressible medium in the form of a fluid for pressure transmission.
  • US4250434 is a, for controlling a machine serving, electropneumatic sensor designed as an elastic pressure hose.
  • DE19703746 is arranged at the rear handle shell on the handle of an electric hand tool a damping element.
  • a fluid padded handle has a pressure sensor that serves to control the pump to produce the vibration damping fill pressure.
  • the object of the invention is a slideway-free implementation for the intuitive control of the performance parameters, in particular the axial impact energy of an at least partially axially striking electric hand tool. Another aspect is the reduction of the vibrations transmitted to the user's hand.
  • an at least partially axially impacting electric hand tool device has a handle and for at least one performance parameter on an electronic control means which is arranged by a two-dimensional force sensor disposed between two, arranged transversely to the impact axis, associated pressing surfaces and the user on the handle in the direction detected on the workpiece applied contact force sliding, is controllable.
  • planar force sensor is designed as an electropneumatic sensor which has a hollow pneumatic force transmission member between a pressure surface and the force sensor element, as a result of which it is very simple, sensitive and robust.
  • the force transmission member is filled with a readily deformable or fluid pressure transmission medium, for example.
  • a readily deformable or fluid pressure transmission medium for example.
  • the hollow pneumatic power transmission member is designed as a cushion or hose, the cross sections are compressed by the contact force and thereby deformed so that the hydrostatic pressure of the pressure transmission medium increases.
  • planar force sensor is arranged in front of the electric hand tool device under the axial bearing of the tool holder, for example, the spindle ball bearing, whereby the entire contact force is measured.
  • the force transmission member is extended to the handle, whereby the measurement of the total contact force on the force sensor element in the handle is possible.
  • the pressing surfaces are arranged with respect to the power flow between the percussion mechanism and the gripping surface of the handle, further advantageously on the tool-side axial fixing of the striking mechanism to the outer housing shell with the handle or on the modular fixing of the drive module to the handle module with the handle.
  • the power transmission member is formed flat across the impact axis and further advantageously disposed between the handle and a vibration-damped handle shell, whereby vibrations within the pressure transmission medium are damped and thus transmitted only reduced to the hand of the user.
  • the side handle is additionally formed with such a force transmission member for forming a planar force sensor, which is provided with a further force sensor element and electrically connected via signal lines to the force sensor element of the handle, whereby in sum the contact forces of both the handle and the side handle are used for control ,
  • the power transmission member of the side handle is pneumatically connected directly to the power transmission member of the handle via a connection hose, whereby a common force sensor element is sufficient and no leading into the front part of the power tool, live lines are necessary, thereby related safety problems are avoided.
  • planar force sensor is connected via a low-pass filter with a cutoff frequency less than 30 Hz to the control means, which filters out the low-frequency control signals and suppresses the higher-frequency vibrations.
  • FIG. 1 an axially striking electric hand tool device 1 with a drums 2 driving electric motor 3 a handle 4 and designed as a phase control electronic control means 5, which arranged with a perpendicular to the striking axis A, planar force sensor 6, which exerted by the user in the direction of the workpiece Contact force F detected on the handle 4 without sliding movement, is controllably connected.
  • the force sensor 6 is free of sliding movement between two associated pressing surfaces 7a, 7b, which are arranged between the percussion mechanism 2 and the gripping surface 8 of the handle 4. Schematically represented are the advantageous pressing surfaces 7a, 7b resp.
  • Force sensor 6 in each case at I on the tool-side axial fixing of the percussion mechanism 2 to the outer housing shell 9 with the handle 4, II in the modular definition of the drive module 10 to the handle module 11 with the handle 4 (force sensor 6"') and III between the Handle 4 and arranged by the flat force sensor 6 vibration damped handle shell 12.
  • a force sensor 6 'in the side handle 13 is pneumatically connected directly to the handle 4 via the connecting hose 14.
  • the annular force sensor 6 is arranged in front in the electric hand tool 1 in the axial bearing of a tool holder 20 in the spindle ball bearing 21 and extended with the connecting hose 14 to the handle 4, or connected to the sensor 6.
  • the force sensor 6 is in the output to Control means 5 downstream of a low-pass filter 19 ( Fig. 1 ).
  • planar force sensor 6 is designed as an electropneumatic sensor which has between a pressure surface 15 and the force sensor element 16, a hollow pneumatic power transmission member 17 which is filled with an easily deformable pressure transmission medium 18 and formed as a flat running hose.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Electrophonic Musical Instruments (AREA)

Description

Die Erfindung bezeichnet ein zumindest teilweise axial schlagendes Elektrohandwerkzeuggerät wie ein Bohrmeisselgerät oder Meisselgerät zum Abbau von Gestein.The invention refers to an at least partially axially impacting electric hand tool device such as a drill bit or chisel device for breaking down rock.

Bei derartigen schlagenden Elektrohandwerkzeuggeräten wird die in einem Schlagwerk erzeugte, axiale Schlagenergie über das Schlagwerkzeug zur Bearbeitung eines Werkstücks verwendet, wobei ein Teil dieser Energie über den Handgriff auf den Nutzer zurückwirkt und in der Hand störende Vibrationen verursacht.In such beating electric hand tool devices, the generated in a percussion axial impact energy over the impact tool for machining a workpiece is used, with part of this energy on the handle on the user back and causes disturbing vibrations in the hand.

Mit einer höheren Anpresskraft am Handgriff ist bei axial schlagenden Handwerkzeuggeräten der intuitive Wunsch nach einer höheren Abbauleistung verbunden, im Gegensatz zu rein drehenden Handwerkzeuggeräten, welche teilweise bei hoher Anpresskraft extra langsam drehen sollen. Leistungsparameter für die Abbauleistung sind insbesondere die Schlagstärke, Schlagfrequenz und optional die Drehzahl des Schlagwerkzeuges.With a higher contact pressure on the handle is the intuitive desire for a higher degradation performance associated with axially beating hand tool, in contrast to purely rotating hand tool, which should turn extra slowly at high contact pressure. Performance parameters for the degradation performance are in particular the impact strength, impact frequency and optionally the speed of the impact tool.

Nach der DE19649468 sind Steuerfunktionen des Elektrohandwerkzeuggerätes im Führungshandgriff oder im Hilfshandgriff angeordnet. Nach der DE3843960 wird die Steuerelektronik eines Elektrohandwerkzeuggerätes über ein schleiferloses Potentiometer mit einem Druckpolster gesteuert. Nach der DE19510365 ist bei einem derartigen schleiferlosen Potentiometer im Stellglied zwischen der Druckplatte und dem Sensor ein komprimierbares Medium in Form eines Fluids zur Druckübertragung angeordnet. Nach der US4250434 ist ein, zur Steuerung einer Maschine dienender, elektropneumatischer Sensor als elastischer Druckschlauch ausgebildet. Nach der DE19703746 ist an der hinteren Griffschale am Handgriff eines Elektrohandwerkzeuggerätes ein Dämpfungselement angeordnet. Nach der US5987705 weist ein fluidgepolsterter Handgriff einen Drucksensor auf, welcher zur Regelung der Pumpe zur Erzeugung des vibrationsdämpfenden Fülldrucks dient.After DE19649468 Control functions of the electric hand tool device in the guide handle or auxiliary handle are arranged. After DE3843960 the control electronics of an electric hand tool device is controlled via a grinderless potentiometer with a pressure pad. After DE19510365 is arranged in such a grinderless potentiometer in the actuator between the pressure plate and the sensor, a compressible medium in the form of a fluid for pressure transmission. After US4250434 is a, for controlling a machine serving, electropneumatic sensor designed as an elastic pressure hose. After DE19703746 is arranged at the rear handle shell on the handle of an electric hand tool a damping element. After US5987705 For example, a fluid padded handle has a pressure sensor that serves to control the pump to produce the vibration damping fill pressure.

Nach der DE3316013 ist mit einem Stellglied am Gehäuse die axiale Schlagenergie eines Bohrhammers stufenlos einstellbar. Nach der DE4231986 erfolgt eine mechanische Steuerung der Kupplung des Schlagwerks eines Bohrhammers über die Anpresskraft des Elektrohandwerkzeuggerätes an das Werkstück. Die dazu erforderlichen, zueinander beweglich aneinander abgleitenden Teile vermindern im rauhen Umfeld des Bauhauptgewerbes bspw. durch eingetragenen Staub, die Ausfallsicherheit des Elektrohandwerkzeuggerätes.After DE3316013 is infinitely adjustable with an actuator on the housing, the axial impact energy of a hammer drill. After DE4231986 There is a mechanical control of the coupling of the percussion of a hammer drill on the contact pressure of Electric hand tool device to the workpiece. The required mutually movable sliding parts together diminish in the harsh environment of the construction industry, for example. By registered dust, the reliability of the electric power tool.

Aus der DE 1 953 485 A ist eine gattungsgemässe Vorrichtung bekannt.From the DE 1 953 485 A is a generic device known.

Die Aufgabe der Erfindung besteht in einer gleitbewegungsfreien Realisierung zur intuitiven Steuerung der Leistungsparameter, insbesondere der axialen Schlagenergie, eines zumindest teilweise axial schlagenden Elektrohandwerkzeuggerätes. Ein weiterer Aspekt besteht in der Verminderung der auf die Hand des Nutzers übertragenen Vibrationen.The object of the invention is a slideway-free implementation for the intuitive control of the performance parameters, in particular the axial impact energy of an at least partially axially striking electric hand tool. Another aspect is the reduction of the vibrations transmitted to the user's hand.

Die Aufgabe wird im wesentlichen durch die Merkmale der unabhängigen Ansprüche gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The object is essentially achieved by the features of the independent claims. Advantageous developments emerge from the subclaims.

Im wesentlichen weist ein zumindest teilweise axial schlagendes Elektrohandwerkzeuggerät einen Handgriff und für zumindest einen Leistungsparameter ein elektronisches Steuermittel auf, welches von einem flächigen Kraftsensor, der zwischen zwei, quer zur Schlagachse angeordneten, einander zugeordneten Pressflächen angeordnet ist und die vom Nutzer auf den Handgriff in Richtung auf das Werkstück ausgeübte Anpresskraft gleitbewegungsfrei erfasst, steuerbar ist.Essentially, an at least partially axially impacting electric hand tool device has a handle and for at least one performance parameter on an electronic control means which is arranged by a two-dimensional force sensor disposed between two, arranged transversely to the impact axis, associated pressing surfaces and the user on the handle in the direction detected on the workpiece applied contact force sliding, is controllable.

Durch die vom flächigen Kraftsensor zwischen den einander zugeordneten Pressflächen gleitbewegungsfreie Erfassung der Anpresskraft zur elektronischen Steuerung der Leistungsparameter ist diese auch im rauhen Umfeld ausfallsicher.By the flat force sensor between the mutually associated pressing surfaces sliding movement-free detection of the contact pressure for electronic control of the performance parameter is fail-safe even in harsh environments.

Vorteilhaft ist der flächige Kraftsensor als ein elektropneumatischer Sensor ausgebildet, welcher zwischen einer Druckfläche und dem Kraftsensorelement ein hohles pneumatisches Kraftübertragungsglied aufweist, wodurch dieser sehr einfach, sensibel und robust ist.Advantageously, the planar force sensor is designed as an electropneumatic sensor which has a hollow pneumatic force transmission member between a pressure surface and the force sensor element, as a result of which it is very simple, sensitive and robust.

Vorteilhaft ist das Kraftübertragungsglied mit einem leicht deformierbaren oder fluiden Druckübertragungsmedium gefüllt, bspw. einem Pneumatiköl, einem Gel oder einem hoch viscoelastischen Festkörper, welcher verdunstungsfrei und nicht frei fliessfähig ist.Advantageously, the force transmission member is filled with a readily deformable or fluid pressure transmission medium, for example. A pneumatic oil, a gel or a highly viscoelastic solid, which is free of evaporation and not free flowing.

Vorteilhaft ist das hohle pneumatische Kraftübertragungsglied als Kissen oder Schlauch ausgebildet, deren Querschnitte durch die Anpresskraft zusammengedrückt und dadurch derart deformiert werden, dass der hydrostatische Druck des Druckübertragungsmediums steigt.Advantageously, the hollow pneumatic power transmission member is designed as a cushion or hose, the cross sections are compressed by the contact force and thereby deformed so that the hydrostatic pressure of the pressure transmission medium increases.

Vorteilhaft ist der flächige Kraftsensor vorne im Elektrohandwerkzeuggerät unter der axialen Lagerung der Werkzeugaufnahme bspw. dem Spindel-Kugellager angeordnet, wodurch die gesamte Anpresskraft gemessen wird.Advantageously, the planar force sensor is arranged in front of the electric hand tool device under the axial bearing of the tool holder, for example, the spindle ball bearing, whereby the entire contact force is measured.

Vorteilhaft ist das Kraftübertragungsglied bis zum Handgriff verlängert, wodurch die Messung der gesamten Anpresskraft am Kraftsensorelement im Handgriff möglich ist.Advantageously, the force transmission member is extended to the handle, whereby the measurement of the total contact force on the force sensor element in the handle is possible.

Vorteilhaft sind die Pressflächen bezüglich des Kraftflusses zwischen dem Schlagwerk und der Grifffläche des Handgriffs angeordnet, weiter vorteilhaft an der werkzeugseitigen axialen Festlegung des Schlagwerks zur äusseren Gehäuseschale mit dem Handgriff oder an der modularen Festlegung des Antriebsmoduls zum Griffmodul mit dem Handgriff.Advantageously, the pressing surfaces are arranged with respect to the power flow between the percussion mechanism and the gripping surface of the handle, further advantageously on the tool-side axial fixing of the striking mechanism to the outer housing shell with the handle or on the modular fixing of the drive module to the handle module with the handle.

Vorteilhaft ist das Kraftübertragungsglied quer zur Schlagachse flächig ausgebildet und weiter vorteilhaft zwischen dem Handgriff und einer vibrationsgedämpften Griffschale angeordnet, wodurch Vibrationen innerhalb des Druckübertragungsmediums gedämpft und somit nur vermindert auf die Hand des Nutzers übertragen werden.Advantageously, the power transmission member is formed flat across the impact axis and further advantageously disposed between the handle and a vibration-damped handle shell, whereby vibrations within the pressure transmission medium are damped and thus transmitted only reduced to the hand of the user.

Vorteilhaft ist zusätzlich der Seitenhandgriff mit einem derartigen Kraftübertragungsglied zur Ausbildung eines flächigen Kraftsensors ausgebildet, welches mit einem weiteren Kraftsensorelement versehen und über Signalleitungen elektrisch mit dem Kraftsensorelement des Handgriffs verbunden ist, wodurch in Summe die Anpresskräfte sowohl des Handgriffs als auch des Seitenhandgriffs zur Steuerung benutzt werden.Advantageously, the side handle is additionally formed with such a force transmission member for forming a planar force sensor, which is provided with a further force sensor element and electrically connected via signal lines to the force sensor element of the handle, whereby in sum the contact forces of both the handle and the side handle are used for control ,

Alternativ vorteilhaft ist das Kraftübertragungsglied des Seitenhandgriffs direkt über einen Verbindungsschlauch pneumatisch mit dem Kraftübertragungsglied des Handgriffs verbunden, wodurch ein gemeinsames Kraftsensorelement ausreichend ist und keine, in den vorderen Teil des Handwerkzeuggerätes hineinführende, spannungsführenden Leitungen notwendig sind, wodurch diesbezügliche Sicherheitsprobleme vermieden werden.Alternatively advantageously, the power transmission member of the side handle is pneumatically connected directly to the power transmission member of the handle via a connection hose, whereby a common force sensor element is sufficient and no leading into the front part of the power tool, live lines are necessary, thereby related safety problems are avoided.

Vorteilhaft ist der flächige Kraftsensor über einen Tiefpassfilter mit einer Grenzfrequenz kleiner 30 Hz mit dem Steuermittel verbunden, welche die niederfrequenten Steuersignale herausfiltert und die höherfrequenten Vibrationen unterdrückt.Advantageously, the planar force sensor is connected via a low-pass filter with a cutoff frequency less than 30 Hz to the control means, which filters out the low-frequency control signals and suppresses the higher-frequency vibrations.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit

  • Fig. 1 als Elektrohandwerkzeuggerät
  • Fig. 2 als Kraftsensor
The invention will be explained in more detail with respect to an advantageous embodiment
  • Fig. 1 as electric hand tool device
  • Fig. 2 as a force sensor

Nach Fig. 1 weist ein axial schlagendes Elektrohandwerkzeuggerät 1 mit einem ein Schlagwerk 2 antreibenden Elektromotor 3 einen Handgriff 4 und ein als Phasenanschnittssteuerung ausgebildetes elektronisches Steuermittel 5 auf, welches mit einem senkrecht zur Schlagachse A angeordneten, flächigen Kraftsensor 6, der die vom Nutzer in Richtung auf das Werkstück ausgeübte Anpresskraft F auf den Handgriff 4 gleitbewegungsfrei erfasst, steuerbar verbunden ist. Der Kraftsensor 6 befindet sich gleitbewegungsfrei zwischen zwei einander zugeordneten Pressflächen 7a, 7b, welche sich zwischen dem Schlagwerk 2 und der Grifffläche 8 des Handgriffs 4 anordnen. Schematisch dargestellt sind die vorteilhaften Pressflächen 7a, 7b resp. Kraftsensor 6" jeweils bei I an der werkzeugseitigen axialen Festlegung des Schlagwerks 2 zur äusseren Gehäuseschale 9 mit dem Handgriff 4, bei II an der modularen Festlegung des Antriebsmoduls 10 zum Griffmodul 11 mit dem Handgriff 4 (Kraftsensor 6"') und bei III zwischen dem Handgriff 4 und einer durch den flächigen Kraftsensor 6 vibrationsgedämpften Griffschale 12 angeordnet. Ein Kraftsensor 6' im Seitenhandgriff 13 ist über den Verbindungsschlauch 14 direkt pneumatisch mit dem Handgriff 4 verbunden. Der kreisringförmige Kraftsensor 6" ist vorne im Elektrohandwerkzeuggerät 1 im Bereich der axialen Lagerung einer Werkzeugaufnahme 20 im Spindel-Kugellager 21 angeordnet und mit dem Verbindungsschlauch 14 bis zum Handgriff 4 verlängert, bzw. mit dem Sensor 6 verbunden. Dem Kraftsensor 6 ist im Ausgang zum Steuermittel 5 ein Tiefpassfilter 19 nachgeschaltet (Fig. 1).To Fig. 1 an axially striking electric hand tool device 1 with a drums 2 driving electric motor 3 a handle 4 and designed as a phase control electronic control means 5, which arranged with a perpendicular to the striking axis A, planar force sensor 6, which exerted by the user in the direction of the workpiece Contact force F detected on the handle 4 without sliding movement, is controllably connected. The force sensor 6 is free of sliding movement between two associated pressing surfaces 7a, 7b, which are arranged between the percussion mechanism 2 and the gripping surface 8 of the handle 4. Schematically represented are the advantageous pressing surfaces 7a, 7b resp. Force sensor 6 "in each case at I on the tool-side axial fixing of the percussion mechanism 2 to the outer housing shell 9 with the handle 4, II in the modular definition of the drive module 10 to the handle module 11 with the handle 4 (force sensor 6"') and III between the Handle 4 and arranged by the flat force sensor 6 vibration damped handle shell 12. A force sensor 6 'in the side handle 13 is pneumatically connected directly to the handle 4 via the connecting hose 14. The annular force sensor 6 "is arranged in front in the electric hand tool 1 in the axial bearing of a tool holder 20 in the spindle ball bearing 21 and extended with the connecting hose 14 to the handle 4, or connected to the sensor 6. The force sensor 6 is in the output to Control means 5 downstream of a low-pass filter 19 ( Fig. 1 ).

Nach Fig. 2 ist der flächige Kraftsensor 6 als ein elektropneumatischer Sensor ausgebildet, welcher zwischen einer Druckfläche 15 und dem Kraftsensorelement 16 ein hohles pneumatisches Kraftübertragungsglied 17 aufweist, welches mit einem leicht deformierbaren Druckübertragungsmedium 18 gefüllt ist und als flächig verlaufender Schlauch ausgebildet ist.To Fig. 2 the planar force sensor 6 is designed as an electropneumatic sensor which has between a pressure surface 15 and the force sensor element 16, a hollow pneumatic power transmission member 17 which is filled with an easily deformable pressure transmission medium 18 and formed as a flat running hose.

Claims (11)

  1. Electric hand tool for performing an at least partly axially-percussive action on a workpiece, with a hammer mechanism (2), with a handgrip (4), and with an electronic control means (5) for at least one performance parameter of the electric hand tool, characterized in that a planar force transducer (6, 6') is arranged between at least two coaligned pressure faces (7a, 7b) orientated at right angles to the percussion axis (A) for slipfree detection of the pressure force (F, F') exerted by the user in the direction towards the workpiece, and in that the control means (5) is controllably connected to the force transducer (6, 6').
  2. Electric hand tool according to Claim 1, characterized in that the planar force transducer (6, 6', 6", 6"') is configured as an electropneumatic transducer that has a hollow pneumatic force transmission element (17) between a pressure face (15) and the force transducer element (16).
  3. Electric hand tool according to Claim 2, characterized in that the force transmission element (17) is filled with a readily deformable or fluid pressure-transmission medium (18).
  4. Electric hand tool according to Claim 2 or Claim 3, characterized in that the force transmission element (17) is configured as a cushion or tube.
  5. Electric hand tool according to any one of Claims 2 to 4, characterized in that a side handgrip (13) is additionally configured with a further force transmission element to form a further planar force transducer (6'").
  6. Electric hand tool according to any one of the preceding claims, characterized in that the planar force transducer (6") is forwardly located in the electric hand tool, under the axial bearing of a tool-receiving socket.
  7. Electric hand tool according to any one of Claims 2 to 5, characterized in that the force transmission element (17) is extended as far as the handgrip (4).
  8. Electric hand tool according to any one of the preceding claims, characterized in that the pressure faces (7a, 7b) are located in terms of force flow between the hammer mechanism (2) and the grip face of the handgrip (4), and moreover optionally on the tool-side axial fastening of the hammer mechanism (2) to an outer casing shell (9) with the handgrip (4) or on the modular fastening of the drive module (10) to a grip module (11) with the handgrip (4).
  9. Electric hand tool according to any one of the preceding claims, characterized in that the pressure faces (7a, 7b) are located between a handgrip (4) and a vibration-damped grip shell (12).
  10. Electric hand tool according to Claim 5, characterized in that the pressure faces (7a, 7b) are located between a handgrip (4) and a vibration-damped grip shell (12) and the force transmission element (17) of a side handgrip (13) is directly pneumatically connected by a connecting tube (14) to the force transmission element (17) of the handgrip (4).
  11. Electric hand tool according to any one of the preceding claims, characterized in that the planar force transducer (6, 6') is connected to the control means (5) via a low-pass filter (19) with a cut-off frequency of less than 30 Hz.
EP02406048A 2001-12-12 2002-12-03 Electrical hand tool with axial percussion Expired - Lifetime EP1319477B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10160864A DE10160864A1 (en) 2001-12-12 2001-12-12 Axial striking electric hand tool device
DE10160864 2001-12-12

Publications (2)

Publication Number Publication Date
EP1319477A1 EP1319477A1 (en) 2003-06-18
EP1319477B1 true EP1319477B1 (en) 2010-04-14

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EP02406048A Expired - Lifetime EP1319477B1 (en) 2001-12-12 2002-12-03 Electrical hand tool with axial percussion

Country Status (5)

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US (1) US6799643B2 (en)
EP (1) EP1319477B1 (en)
JP (1) JP2003191178A (en)
CN (1) CN1298471C (en)
DE (2) DE10160864A1 (en)

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CN1424166A (en) 2003-06-18
US20030116333A1 (en) 2003-06-26
CN1298471C (en) 2007-02-07
DE10160864A1 (en) 2003-06-26
JP2003191178A (en) 2003-07-08
EP1319477A1 (en) 2003-06-18
US6799643B2 (en) 2004-10-05

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