EP1952950A2 - Portable power tool with an oscillation damper - Google Patents

Portable power tool with an oscillation damper Download PDF

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Publication number
EP1952950A2
EP1952950A2 EP08100787A EP08100787A EP1952950A2 EP 1952950 A2 EP1952950 A2 EP 1952950A2 EP 08100787 A EP08100787 A EP 08100787A EP 08100787 A EP08100787 A EP 08100787A EP 1952950 A2 EP1952950 A2 EP 1952950A2
Authority
EP
European Patent Office
Prior art keywords
housing
vibration
hand tool
vibration absorber
tool according
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
EP08100787A
Other languages
German (de)
French (fr)
Other versions
EP1952950A3 (en
EP1952950B1 (en
Inventor
Franz Mössnang
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 EP1952950A2 publication Critical patent/EP1952950A2/en
Publication of EP1952950A3 publication Critical patent/EP1952950A3/en
Application granted granted Critical
Publication of EP1952950B1 publication Critical patent/EP1952950B1/en
Active 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
    • 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
    • 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
    • B25D2211/06—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
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0019—Guide-sleeves
    • 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
    • B25D2217/0073—Arrangements for damping of the reaction force
    • B25D2217/0076—Arrangements for damping of the reaction force by use of counterweights
    • B25D2217/0092—Arrangements for damping of the reaction force by use of counterweights being spring-mounted

Definitions

  • the invention refers to a hand tool, in particular a rotary hammer, combination hammer or chisel hammer, with an active vibration damper.
  • a vibration absorber is a vibratory subsystem, which consists of an abstract vibratable mass, an abstract spring and an abstract damper, which must not be explicitly designed as a concrete component.
  • the abstract damper is often not realized as a concrete component and is still effective by practically always occurring friction and flow losses.
  • ordinary passive vibration absorbers which are exclusively self-excited, of actively controlled vibration absorbers, which are deliberately alienated by a mostly periodic excitation function.
  • EP1710052 is the hollow cylindrical passive vibration damper arranged around the guide tube of the striking mechanism around.
  • the object of the invention is the structurally simple realization of a vibration damper, which is deactivated in the absence of contact pressure.
  • a hand tool with a housing and a Heilfeder Farbwerk with a percussion piston, which strikes a striker, at least one vibration absorber with a vibratable absorber mass, which is axially biased by at least one spring to the housing, the vibration absorber via an axially displaceable excitation active from can be excitable in working position.
  • the vibration absorber is only actively excited with the beat frequency if the striker is in the working position due to the contact pressure of the hand tool machine, but not due to the lack of contact pressure in the idling position, in which the vibration absorber swings passively.
  • the excitation means extends at least partially circumferentially through a guide tube for the striker, whereby the excitation means is displaceable by a direct contact with the striker, in particular during rebound of the impact driven tool.
  • the excitation means is annular, whereby no inclinations or bends occur in its contact with the striker.
  • the vibration damper is hollow cylindrical, whereby it can be arranged around the air spring striking around.
  • the vibration absorbers are compact, whereby this (r) space-saving laterally next to the air spring impact mechanism can be arranged / are.
  • Fig. 1 has an axially rotating and hitting hand tool 1 with a housing 2 and a Heilfedertschwerk 3 with a percussion piston 4, which strikes a striker 5, two compact vibration absorber 6, wherein only one is shown, since the second mirror image in the lower, not shown Half-half lies.
  • the vibration damper 6 has a vibratable absorber mass 7, which is axially biased by a first spring 8a to the housing 2.
  • the vibration damper 6 is also active on a second spring 8b via an axially displaceable excitation means 9 can be excited by the located in the illustrated working position anvil 5 when it is repelled by the rebounding tool 10.
  • the excitation means 9 partially engages through a guide tube 11 for the striker fifth

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

Abstract

The tool (1) has a housing (2) and a pneumatic spring hammer mechanism (3) with a striker bolt (4) that strikes an anvil (5), at least one vibration damper (6) with a swinging damping mass (7) that is axially biased towards the housing by at least one spring (8a,8b). The vibration damper can be actively stimulated by the anvil in the working position via an axially displaceable stimulation arrangement (9).

Description

Die Erfindung bezeichnet eine Handwerkzeugmaschine, insbesondere einen Bohrhammer, Kombihammer oder Meisselhammer, mit einem aktiven Schwingungstilger.The invention refers to a hand tool, in particular a rotary hammer, combination hammer or chisel hammer, with an active vibration damper.

Ein Schwingungstilger ist ein schwingungsfähiges Teilsystem, welches aus einer abstrakten schwingbaren Masse, einer abstrakten Feder und einem abstrakten Dämpfer besteht, welche jeweils nicht explizit als konkretes Bauteil ausgeführt sein müssen. Insbesondere der abstrakte Dämpfer wird oft nicht als konkretes Bauteil realisiert und ist dennoch durch praktisch stets auftretende Reib- und Strömungsverluste wirksam. Man unterscheidet gewöhnliche passive Schwingungstilger, welche ausschliesslich selbst erregt sind, von aktiv gesteuerten Schwingungstilgern, welche über eine zumeist periodische Erregungsfunktion gezielt fremderregt sind.A vibration absorber is a vibratory subsystem, which consists of an abstract vibratable mass, an abstract spring and an abstract damper, which must not be explicitly designed as a concrete component. In particular, the abstract damper is often not realized as a concrete component and is still effective by practically always occurring friction and flow losses. A distinction is made between ordinary passive vibration absorbers, which are exclusively self-excited, of actively controlled vibration absorbers, which are deliberately alienated by a mostly periodic excitation function.

Durch eine geeignete Wahl der Federkonstanten und der Masse wird bei einem passiven Schwingungstilger dessen Eigenfrequenz nahe der zu dämpfenden Störfrequenz dimensioniert, in diesem Verwendungsfall der Vibration des Aussengehäuses der Handwerkzeugmaschine.By a suitable choice of the spring constant and the mass of a passive vibration absorber whose natural frequency is dimensioned close to the noise frequency to be damped, in this case of use, the vibration of the outer housing of the power tool.

Bei einem aktiven Schwingungstilger, der zumeist etwas oberhalb der Eigenfrequenz mit der Störfrequenz fremderregt wird, wird eine gute Vibrationsreduzierung des Aussengehäuses ohne störende Schwebungseffekte erzielt.In an active vibration damper, which is externally excited mostly slightly above the natural frequency with the interference frequency, a good vibration reduction of the outer housing is achieved without disturbing beating effects.

Nach der FR2237734 werden bei schlagenden Handwerkzeugmaschinen zur Verminderung der Gehäuseschwingungen passive Schwingungstilger eingesetzt, nach der US4478293 sind zwei passive Schwingungstilger über Druckluftschwankungen miteinander synchronisiert.After FR2237734 are used in striking hand tool machines to reduce the housing vibrations passive vibration absorber, according to the US4478293 Two passive vibration absorbers are synchronized with each other via compressed air fluctuations.

Nach der DE815179 sind beidseitig lateral des Schlagwerks zwei passive Schwingungstilger angeordnet.After DE815179 Two passive vibration absorbers are arranged on both sides laterally of the impact mechanism.

Nach der EP1710052 ist der hohlzylinderförmig ausgebildete passive Schwingungstilger um das Führungsrohr des Schlagwerks herum angeordnet.After EP1710052 is the hollow cylindrical passive vibration damper arranged around the guide tube of the striking mechanism around.

Nach der W02006022345 sind mehrere kompakt ausgebildete Schwingungstilger innerhalb des Aussengehäuses an verschiedenen Positionen angeordnet.After W02006022345 Several compact trained vibration absorber are arranged within the outer housing at different positions.

Nach der EP1464449 sind über die beim Antrieb des Erregerkolbens entstehenden Druckluftschwankungen aktiv gesteuerte Schwingungstilger um das Führungsrohr des Schlagwerks herum angeordnet. Bei fehlendem Anpressdruck der Handwerkzeugmaschine wird neben dem deaktivierten Schlagwerk auch über eine versetzbare Steuerhülse der aktiv gesteuerte Schwingungstilger deaktiviert.After EP1464449 are actively controlled about the guide tube of the percussion mechanism about the emerging during the drive of the exciter piston compressed air fluctuations vibration damper. In the absence of contact pressure of the power tool, in addition to the deactivated impact mechanism, the actively controlled vibration absorber is deactivated via a displaceable control sleeve.

Die Aufgabe der Erfindung besteht in der konstruktiv einfachen Realisierung eines Schwingungstilgers, welcher bei fehlendem Anpressdruck deaktiviert wird.The object of the invention is the structurally simple realization of a vibration damper, which is deactivated in the absence of contact pressure.

Die Aufgabe wird im Wesentlichen durch die Merkmale des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The object is essentially achieved by the features of claim 1. Advantageous developments emerge from the subclaims.

So weist eine Handwerkzeugmaschine mit einem Gehäuse und einem Luftfederschlagwerk mit einem Schlagkolben, welcher auf einen Döpper schlägt, zumindest einen Schwingungstilger mit einer schwingbaren Tilgermasse auf, welche über zumindest eine Feder zum Gehäuse axial druckvorgespannt ist, wobei der Schwingungstilger über ein axial versetzbares Erregungsmittel aktiv vom sich in Arbeitsposition befindenden Döpper erregbar ist.Thus, a hand tool with a housing and a Luftfederschlagwerk with a percussion piston, which strikes a striker, at least one vibration absorber with a vibratable absorber mass, which is axially biased by at least one spring to the housing, the vibration absorber via an axially displaceable excitation active from can be excitable in working position.

Durch die Erregung des Schwingungstilgers durch den Döpper wird der Schwingungstilger nur genau dann aktiv mit der Schlagfrequenz erregt, wenn sich durch den Anpressdruck der Handwerkzeugmaschine der Döpper in Arbeitsposition befindet, nicht jedoch durch fehlenden Anpressdruck in Leerschlagposition, bei welchem der Schwingungstilger passiv schwingt.As a result of the excitation of the vibration absorber by the striker, the vibration absorber is only actively excited with the beat frequency if the striker is in the working position due to the contact pressure of the hand tool machine, but not due to the lack of contact pressure in the idling position, in which the vibration absorber swings passively.

Vorteilhaft durchgreift das Erregungsmittel zumindest teilweise umfänglich ein Führungsrohr für den Döpper, wodurch das Erregungsmittel durch einen direkten Kontakt mit dem Döpper versetzbar ist, insbesondere beim Rückprall des schlagend angetriebenen Werkzeuges.Advantageously, the excitation means extends at least partially circumferentially through a guide tube for the striker, whereby the excitation means is displaceable by a direct contact with the striker, in particular during rebound of the impact driven tool.

Vorteilhaft ist das Erregungsmittel ringförmig ausgebildet, wodurch bei dessen Kontakt zum Döpper keine Neigungen oder Biegungen auftreten.Advantageously, the excitation means is annular, whereby no inclinations or bends occur in its contact with the striker.

Vorteilhaft ist der Schwingungstilger hohlzylinderförmig ausgebildet, wodurch dieser um das Luftfederschlagwerk herum anordenbar ist.Advantageously, the vibration damper is hollow cylindrical, whereby it can be arranged around the air spring striking around.

Alternativ vorteilhaft ist der/sind die Schwingungstilger kompakt ausgebildet, wodurch diese(r) raumsparend seitlich neben dem Luftfederschlagwerk anordenbar ist/sind.Alternatively advantageous is the / the vibration absorbers are compact, whereby this (r) space-saving laterally next to the air spring impact mechanism can be arranged / are.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit:

  • Fig. 1 als Halblängsteilschnitt einer Handwerkzeugmaschine
  • Fig. 2 als Variante
The invention will be explained in more detail with respect to an advantageous embodiment with:
  • Fig. 1 as a semi-longitudinal section of a hand tool
  • Fig. 2 as a variant

Nach Fig. 1 weist eine axial drehend und schlagende Handwerkzeugmaschine 1 mit einem Gehäuse 2 und einem Luftfederschlagwerk 3 mit einem Schlagkolben 4, welcher auf einen Döpper 5 schlägt, zwei kompakt ausgebildete Schwingungstilger 6 auf, wobei nur einer dargestellt ist, da der zweite spiegelbildlich in der nicht dargestellten unteren Halbschnitthälfte liegt. Der Schwingungstilger 6 weist eine schwingbare Tilgermasse 7 auf, welche über eine erste Feder 8a zum Gehäuse 2 axial druckvorgespannt ist. Der Schwingungstilger 6 ist zudem an einer zweiten Feder 8b über ein axial versetzbares Erregungsmittel 9 aktiv vom sich in der dargestellten Arbeitsposition befindenden Döpper 5 erregbar, wenn dieser vom rückprallenden Werkzeug 10 zurückgestossen wird. Das Erregungsmittel 9 durchgreift teilweise umfänglich ein Führungsrohr 11 für den Döpper 5.To Fig. 1 has an axially rotating and hitting hand tool 1 with a housing 2 and a Luftfederschlagwerk 3 with a percussion piston 4, which strikes a striker 5, two compact vibration absorber 6, wherein only one is shown, since the second mirror image in the lower, not shown Half-half lies. The vibration damper 6 has a vibratable absorber mass 7, which is axially biased by a first spring 8a to the housing 2. The vibration damper 6 is also active on a second spring 8b via an axially displaceable excitation means 9 can be excited by the located in the illustrated working position anvil 5 when it is repelled by the rebounding tool 10. The excitation means 9 partially engages through a guide tube 11 for the striker fifth

Nach Fig. 2 ist in Abwandlung zu Fig. 1 das Erregungsmittel 9' ringförmig und der genau eine Schwingungstilger 6' hohlzylinderförmig (bezüglich Tilgermasse 7' und Federn 8a', 8b') um das Luftfederschlagwerk 3 herum ausgebildet. Dabei stützt sich der Schwingungstilger 6' über seine erste Feder 8a' axial an einem Antriebsritzel 12 ab, welches axial fest zum Gehäuse 2 gelagert ist.To Fig. 2 is in modification too Fig. 1 the excitation means 9 'annular and the exact one vibration absorber 6' hollow cylindrical (with respect to absorber mass 7 'and springs 8a', 8b ') formed around the air spring impact 3 around. In this case, the vibration damper 6 'is supported axially via its first spring 8a' on a drive pinion 12, which is mounted axially fixed to the housing 2.

Claims (5)

Eine Handwerkzeugmaschine (1) mit einem Gehäuse (2) und einem Luftfederschlagwerk (3) mit einem Schlagkolben (4), welcher auf einen Döpper (5) schlägt, weist zumindest einen Schwingungstilger (6') mit einer schwingbaren Tilgermasse (7, 7') auf, welche über zumindest eine Feder (8a, 8a') zum Gehäuse (2) axial druckvorgespannt ist, dadurch gekennzeichnet, dass der Schwingungstilger (6, 6') über ein axial versetzbares Erregungsmittel (9') aktiv vom sich in Arbeitsposition befindenden Döpper (5) erregbar ist.A handheld power tool (1) with a housing (2) and an air spring striking mechanism (3) with a percussion piston (4) striking an anvil (5) has at least one vibration absorber (6 ') with a swingable absorber mass (7, 7'). ), which is axially pressure-biased via at least one spring (8a, 8a ') to the housing (2), characterized in that the vibration absorber (6, 6') via an axially displaceable excitation means (9 ') active from the working position Döpper (5) is excitable. Handwerkzeugmaschine nach Anspruch 1, dadurch gekennzeichnet, dass das Erregungsmittel (9) zumindest teilweise umfänglich ein Führungsrohr (11) für den Döpper (5) durchgreift.Powered hand tool according to claim 1, characterized in that the excitation means (9) engages at least partially circumferentially a guide tube (11) for the striker (5). Handwerkzeugmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Erregungsmittel (9) ringförmig ausgebildet ist.Powered hand tool according to claim 1 or 2, characterized in that the excitation means (9) is annular. Handwerkzeugmaschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der/die Schwingungstilger (6) kompakt ausgebildet ist/sind.Powered hand tool according to one of claims 1 to 3, characterized in that the / the vibration absorber (6) is compact / are formed. Handwerkzeugmaschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Schwingungstilger (6') hohlzylinderförmig ausgebildet ist.Powered hand tool according to one of claims 1 to 3, characterized in that the vibration damper (6 ') is formed as a hollow cylinder.
EP08100787.4A 2007-01-31 2008-01-23 Portable power tool with an oscillation damper Active EP1952950B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007000059A DE102007000059A1 (en) 2007-01-31 2007-01-31 Hand tool with vibration absorber

Publications (3)

Publication Number Publication Date
EP1952950A2 true EP1952950A2 (en) 2008-08-06
EP1952950A3 EP1952950A3 (en) 2012-11-07
EP1952950B1 EP1952950B1 (en) 2014-04-09

Family

ID=39145006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08100787.4A Active EP1952950B1 (en) 2007-01-31 2008-01-23 Portable power tool with an oscillation damper

Country Status (5)

Country Link
US (1) US7712548B2 (en)
EP (1) EP1952950B1 (en)
JP (1) JP5189373B2 (en)
CN (1) CN101235869B (en)
DE (1) DE102007000059A1 (en)

Cited By (4)

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Publication number Priority date Publication date Assignee Title
EP2018939A3 (en) * 2007-07-24 2010-05-19 Makita Corporation Power tool with vibration damping mechanism
EP2253430A1 (en) 2009-05-20 2010-11-24 Friedrich Duss Maschinenfabrik GmbH & Co. KG Electric tool machine, in particular handheld hammer drill
WO2013131678A1 (en) * 2012-03-09 2013-09-12 Robert Bosch Gmbh Hand-machine tool device
EP3626398A1 (en) 2018-09-19 2020-03-25 Hilti Aktiengesellschaft Forcibly energised biharmonic damper

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JP4647957B2 (en) * 2004-08-27 2011-03-09 株式会社マキタ Work tools
JP4573637B2 (en) * 2004-12-02 2010-11-04 株式会社マキタ Reciprocating work tool
US8485274B2 (en) 2007-05-14 2013-07-16 Makita Corporation Impact tool
JP4965334B2 (en) * 2007-05-14 2012-07-04 株式会社マキタ Impact tool
JP4965333B2 (en) * 2007-05-14 2012-07-04 株式会社マキタ Impact tool
JP5269566B2 (en) * 2008-12-03 2013-08-21 株式会社マキタ Work tools
JP5294826B2 (en) * 2008-12-19 2013-09-18 株式会社マキタ Impact tool
JP5361504B2 (en) * 2009-04-10 2013-12-04 株式会社マキタ Impact tool
DE102009027422A1 (en) * 2009-07-02 2011-01-05 Robert Bosch Gmbh Device for reducing and / or compensating vibrations, in particular for a handheld power tool and for use in handheld power tools
DE102009047106A1 (en) * 2009-11-25 2011-05-26 Robert Bosch Gmbh Variation of the natural frequency of vibrating means in power tools
DE102009054723A1 (en) * 2009-12-16 2011-06-22 Robert Bosch GmbH, 70469 Hand tool
DE102010030026A1 (en) * 2010-06-14 2012-02-23 Robert Bosch Gmbh striking mechanism
DE102010040173A1 (en) * 2010-09-02 2012-03-08 Hilti Aktiengesellschaft Hand tool
DE102011007725A1 (en) * 2011-04-20 2012-10-25 Hilti Aktiengesellschaft Hand tool and absorber
US8752811B2 (en) * 2011-11-11 2014-06-17 Fives Machining Systems, Inc. Symmetrical head mounted tuned mass damper
FI123928B (en) 2012-09-06 2013-12-31 Robit Rocktools Ltd Procedure for exploring boreholes, bore arrangements, and borehole survey composition
US10232500B2 (en) 2012-12-17 2019-03-19 Swerea Ivf Ab Impact machine
JP6271577B2 (en) * 2012-12-17 2018-01-31 スウェレア・アイブイエフ・エービーＳｗｅｒｅａ ＩＶＦ ＡＢ Impact machine

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DE815179C (en) 1949-11-17 1951-10-01 Franz Dr-Ing Bollenrath Pneumatic hammer with mass balancing
FR2237734A1 (en) 1973-07-16 1975-02-14 Inst Nal Rech Securite Oscillating mass shock absorbers for pneumatic drill - two sliding masses sprung above and below flank drill casing
US4478293A (en) 1981-06-10 1984-10-23 Hilti Aktiengesellschaft Hammer drill or chipping hammer
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2018939A3 (en) * 2007-07-24 2010-05-19 Makita Corporation Power tool with vibration damping mechanism
US7806201B2 (en) 2007-07-24 2010-10-05 Makita Corporation Power tool with dynamic vibration damping
EP2253430A1 (en) 2009-05-20 2010-11-24 Friedrich Duss Maschinenfabrik GmbH & Co. KG Electric tool machine, in particular handheld hammer drill
DE102009022088A1 (en) 2009-05-20 2010-11-25 Friedrich Duss Maschinenfabrik Gmbh & Co.Kg Electric power tool, in particular hand-operated hammer drill
WO2013131678A1 (en) * 2012-03-09 2013-09-12 Robert Bosch Gmbh Hand-machine tool device
EP3626398A1 (en) 2018-09-19 2020-03-25 Hilti Aktiengesellschaft Forcibly energised biharmonic damper

Also Published As

Publication number Publication date
US7712548B2 (en) 2010-05-11
US20080185165A1 (en) 2008-08-07
JP2008188760A (en) 2008-08-21
EP1952950A3 (en) 2012-11-07
CN101235869A (en) 2008-08-06
CN101235869B (en) 2011-05-25
JP5189373B2 (en) 2013-04-24
DE102007000059A1 (en) 2008-09-18
EP1952950B1 (en) 2014-04-09

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