EP1202840A1 - Bohr- oder schlaghammer - Google Patents
Bohr- oder schlaghammerInfo
- Publication number
- EP1202840A1 EP1202840A1 EP00938558A EP00938558A EP1202840A1 EP 1202840 A1 EP1202840 A1 EP 1202840A1 EP 00938558 A EP00938558 A EP 00938558A EP 00938558 A EP00938558 A EP 00938558A EP 1202840 A1 EP1202840 A1 EP 1202840A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- guide tube
- damping
- spring
- hammer
- hammer drill
- 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
Links
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
- B25D11/125—Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
Definitions
- the invention is based on a hammer drill or percussion hammer according to the preamble of claim 1.
- a rotary hammer or percussion hammer which has a guide tube which is axially displaceably mounted in a housing.
- An axially reciprocating piston is accommodated in the guide tube and is coupled to a racket via an air cushion.
- a restoring spring acts on the guide tube with a restoring force in the direction of a front starting position, in which the air cushion is ventilated via an opening in the guide tube, so that the striking mechanism of the hammer drill or percussion hammer goes idle and no more axial impacts occur Tools are exercised.
- the hammer drill or percussion hammer according to the invention with the features of claim 1 has the advantage that the vibrations caused by the percussion mechanism can be reduced in a relatively simple manner.
- FIGS. 1 to 3 each show a section through the front part of a rotary hammer, with a half section through the rotary hammer in an idling position in the upper half of the figure and a half section through the rotary hammer in a striking position in the lower half of the figure.
- 10 denotes a hammer drill which has a housing 11 in which a striking mechanism 12 is accommodated.
- a guide tube 13 is rotatably supported in bearings 14, 15 and axially displaceable to a limited extent.
- the guide tube receives a piston 16, a striker 17 and an anvil 18 in a known manner.
- Piston 16 can be driven back and forth via a connecting rod 19.
- the guide tube 13 forms a tool holder 20 for receiving a tool, not shown.
- the striker 18 is provided with a circumferential collar 21 by means of which it can be supported on the guide tube 13 toward the rear, towards the piston 16, via a damping ring 22 and a stop ring 23 and a snap ring 24.
- an air cushion space 25 is formed, which can be ventilated via radial through bores 26 in the guide tube 13.
- the hammer drill 10 is shown in an idle position, in which the guide tube 13 is urged by the return spring 27 in the direction of the tool holder 20 into a forward starting position.
- the force of the return spring 27 is first via the disk 29, which forms a first axial stop on the guide tube side, onto a damping element 30 and then via a retaining disk 31 and a retaining ring 34 onto the
- Transfer guide tube 13 The holding disc 31 forms a second axial stop on the housing side. To the front, the axial displacement of the guide tube 13 is limited by an annular disc 32, which serves as a front stop on the housing ring 34. The annular disc 32 is in turn axially supported on the bearing 14 via an O-ring 33.
- the air cushion space 25 is ventilated via the through holes 26, so that no effective air cushion can build up between the piston 16 and the racket 17 and the striking mechanism 12 is therefore not activated.
- the hammer drill 10 is shown in the striking position in which the through-hole stanchions 26 are radially covered by the bearing 15 so that the air cushion space 25 is sealed.
- an air cushion builds up in the air cushion space 25, via which the striker 17 is also driven to and fro releases the tool (not shown in more detail) in the tool holder 20, the striker 18 experiencing setbacks as reaction forces from the tool towards the striking mechanism 12.
- These setbacks are transmitted to the guide tube 13 via the damping ring 22, the stop ring 23 and the snap ring 24.
- the guide tube 13 is cushioned towards the rear via the return spring 27 relative to the housing 11. In the striking position, however, the return spring 27 is compressed to such an extent that the damping element 30, which is separate from the return spring 27, is supported directly on the bearing ring 28 on the housing side. In this way, the setbacks of the striker 18 transmitted to the guide tube 13 are absorbed by the housing 11, bypassing the return spring 27, and effectively damped by the damping element 30.
- the embodiment of Figure 2 differs from the embodiment of Figure 1 only in that a plate spring assembly 36 is used instead of a damping element 30. All other parts, as in the following third exemplary embodiment according to FIG. 3, are identified by the same reference numerals. Due to the plate spring assembly 36, a greater deflection of the guide tube 13 compared to the damping element 30 from FIG. 1 can be achieved after a kickback by the striker 18, whereby a different damping than the damping element 30 can be achieved.
- a coil spring 37 is arranged as a spring or damping member between the guide tube 13 and the housing 11. With the help of the coil spring 37, a different spring characteristic can be achieved than with disc springs. In this case too, a return damping independent of the return spring 27 is ensured in the striking position.
- a damping element 30 with a plate spring assembly 36 or a coil spring 37 or other damping or spring members, this being possible both in parallel and in series connection.
- the hammer drill 10 can also be designed as a pure percussion hammer without rotating the guide tube 13.
- the damping or spring element 30, 36, 37 that is additional to the return spring 27 can also be implemented by the return spring itself, provided that it has a non-linear spring or damping characteristic. It is essential that the spring or damping member in the striking position of the guide tube 13 between the guide tube 13 and the housing 11 has a spring or damping characteristic which deviates from the return spring 27 in the region of the idle position of the guide tube.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
- Earth Drilling (AREA)
- Drilling And Boring (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19933972 | 1999-07-20 | ||
DE19933972A DE19933972A1 (de) | 1999-07-20 | 1999-07-20 | Bohr- oder Schlaghammer |
PCT/DE2000/001549 WO2001005558A1 (de) | 1999-07-20 | 2000-05-16 | Bohr- oder schlaghammer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1202840A1 true EP1202840A1 (de) | 2002-05-08 |
EP1202840B1 EP1202840B1 (de) | 2003-03-19 |
Family
ID=7915405
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00938558A Expired - Lifetime EP1202840B1 (de) | 1999-07-20 | 2000-05-16 | Bohr- oder schlaghammer |
Country Status (6)
Country | Link |
---|---|
US (1) | US6675908B1 (de) |
EP (1) | EP1202840B1 (de) |
JP (1) | JP2003505257A (de) |
CN (1) | CN1247365C (de) |
DE (2) | DE19933972A1 (de) |
WO (1) | WO2001005558A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2425503A (en) * | 2005-04-28 | 2006-11-01 | Bosch Gmbh Robert | Hand machine tool striking mechanism unit |
Families Citing this family (51)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10122820A1 (de) * | 2001-05-11 | 2002-11-21 | Bosch Gmbh Robert | Handwerkzeugmaschine |
DE10261030A1 (de) * | 2002-12-24 | 2004-07-08 | Robert Bosch Gmbh | Bohrhammer |
WO2004082897A1 (en) * | 2003-03-21 | 2004-09-30 | Black & Decker Inc | Vibration reduction apparatus for power tool and power tool incorporating such apparatus |
DE10362025B4 (de) * | 2003-05-20 | 2006-02-09 | Robert Bosch Gmbh | Bohr- oder Schlaghammer |
DE10323606B4 (de) * | 2003-05-20 | 2005-04-14 | Robert Bosch Gmbh | Elastische Döpperführung |
DE10357962B3 (de) * | 2003-12-11 | 2005-09-08 | Hilti Ag | Bohrhammer |
DE10359572A1 (de) * | 2003-12-18 | 2005-07-28 | Robert Bosch Gmbh | Schlagwerk für eine repetierend schlagende Handwerkzeugmaschine |
JP4179159B2 (ja) * | 2003-12-18 | 2008-11-12 | 日立工機株式会社 | 打撃工具 |
DE102004025951A1 (de) * | 2004-05-27 | 2005-12-22 | Robert Bosch Gmbh | Handwerkzeugmaschine, insbesondere Bohr- und/oder Schlaghammer |
DE102004047470A1 (de) * | 2004-09-30 | 2006-04-06 | Robert Bosch Gmbh | Handwerkzeugmaschine, insbesondere Bohr- und/oder Schlaghammer |
US7325624B2 (en) * | 2004-11-24 | 2008-02-05 | Hitachi Koki Co., Ltd. | Hammer drill having switching mechanism for switching operation modes |
ATE396838T1 (de) * | 2004-12-23 | 2008-06-15 | Black & Decker Inc | Kraftwerkzeuggehäuse |
ATE396841T1 (de) * | 2004-12-23 | 2008-06-15 | Black & Decker Inc | Kraftwerkzeuggehäuse |
EP1674213B1 (de) * | 2004-12-23 | 2008-10-01 | BLACK & DECKER INC. | Kraftwerkzeug mit Kühlvorrichtung |
DE102005019711A1 (de) * | 2005-04-28 | 2006-11-09 | Robert Bosch Gmbh | Handwerkzeugmaschinenschlagwerkeinheit |
US7383895B2 (en) * | 2005-08-19 | 2008-06-10 | Makita Corporation | Impact power tool |
JP4509890B2 (ja) * | 2005-08-19 | 2010-07-21 | 株式会社マキタ | 衝撃式作業工具 |
JP4509894B2 (ja) * | 2005-08-29 | 2010-07-21 | 株式会社マキタ | 衝撃式作業工具 |
EP1787761B1 (de) * | 2005-11-16 | 2010-01-06 | Metabowerke GmbH | Motorisch angetriebener Bohrhammer |
DE102005000179A1 (de) * | 2005-12-07 | 2007-06-14 | Hilti Ag | Hammerschlaggerät |
JP4686372B2 (ja) | 2006-02-01 | 2011-05-25 | 株式会社マキタ | 衝撃式作業工具 |
DE102006000395A1 (de) * | 2006-08-07 | 2008-02-14 | Hilti Ag | Handwerkzeugmaschine mit pneumatischem Schlagwerk |
JP4664253B2 (ja) * | 2006-08-24 | 2011-04-06 | 株式会社マキタ | 打撃工具 |
JP4815362B2 (ja) * | 2007-02-06 | 2011-11-16 | 株式会社マキタ | 衝撃式作業工具 |
US7878265B2 (en) * | 2007-02-06 | 2011-02-01 | Makita Corporation | Impact power tool |
DE102007000131A1 (de) * | 2007-03-07 | 2008-09-11 | Hilti Ag | Handwerkzeugmaschine mit pneumatischem Schlagwerk |
US8485274B2 (en) * | 2007-05-14 | 2013-07-16 | Makita Corporation | Impact tool |
CL2008002367A1 (es) * | 2007-08-13 | 2009-01-02 | Russell Mineral Equipment Pty Ltd | Martillo sin retroimpacto accionado neumaticamente que comprende una primera carcasa, una cabeza de cincel y un mecanismo de piston dispuesto en un tubo, con medios de ingreso de aire a baja presion y medios de ingreso de aire a alta presion que permiten el movimiento del piston. |
JP5100272B2 (ja) * | 2007-09-13 | 2012-12-19 | 株式会社マキタ | 打撃工具 |
DE102007048887B4 (de) * | 2007-10-11 | 2017-10-26 | Andreas Stihl Ag & Co. Kg | Handgeführtes Arbeitsgerät |
US7681658B2 (en) * | 2007-11-06 | 2010-03-23 | Maurice DUVAL | Pneumatic impact tool |
JP5202997B2 (ja) * | 2008-03-05 | 2013-06-05 | 株式会社マキタ | 作業工具 |
DE102008022454B4 (de) * | 2008-05-08 | 2014-06-26 | Aeg Electric Tools Gmbh | Bohrhammer |
JP5234414B2 (ja) * | 2008-08-19 | 2013-07-10 | 日立工機株式会社 | 打撃工具 |
DE102009050014B4 (de) | 2009-10-21 | 2013-07-11 | Metabowerke Gmbh | Motorisch angetriebenes Werkzeuggerät mit Bohrhammerbetriebsart |
DE102009046479A1 (de) * | 2009-11-06 | 2011-05-19 | Hilti Aktiengesellschaft | Handwerkzeugmaschine |
CN101787852B (zh) * | 2010-02-04 | 2012-10-31 | 冯静 | 以锤击作为动力的冲击钻及其使用方法 |
DE102011007433A1 (de) * | 2010-04-20 | 2011-12-08 | Robert Bosch Gmbh | Handwerkzeugmaschinenvorrichtung |
SE534815C2 (sv) * | 2010-05-03 | 2012-01-10 | Atlas Copco Rock Drills Ab | Bergborrmaskin med dämpkolv |
TW201206656A (en) * | 2010-08-06 | 2012-02-16 | Top Gearbox Industry Co Ltd | Device incapable of generating vibration while reversely rotated |
DE102010044011A1 (de) * | 2010-11-16 | 2012-05-16 | Hilti Aktiengesellschaft | Handwerkzeugmaschine |
DE102011081617A1 (de) * | 2011-08-26 | 2013-02-28 | Hilti Aktiengesellschaft | Handgehaltene Werkzeugmaschine |
US9416593B2 (en) | 2012-12-28 | 2016-08-16 | Smith International, Inc. | Piston strike face and bit interface for percussion hammer drill |
CN103223660B (zh) * | 2013-05-15 | 2015-02-25 | 长沙矿山研究院有限责任公司 | 一种销套式液压冲击器 |
EP2857150A1 (de) * | 2013-10-03 | 2015-04-08 | HILTI Aktiengesellschaft | Handwerkzeugmaschine |
CN110125880B (zh) * | 2018-02-09 | 2021-03-16 | 苏州宝时得电动工具有限公司 | 锁定机构及具有该锁定机构的冲击工具 |
CN110355728B (zh) * | 2018-04-11 | 2023-03-17 | 株式会社牧田 | 冲击工具 |
CN110394769B (zh) * | 2018-04-24 | 2022-03-01 | 博世电动工具(中国)有限公司 | 电动工具 |
EP3822037A1 (de) * | 2019-11-15 | 2021-05-19 | Hilti Aktiengesellschaft | Schlagwerksanordnung |
JP7451184B2 (ja) | 2020-01-20 | 2024-03-18 | 株式会社マキタ | 打撃工具 |
WO2021182242A1 (ja) * | 2020-03-12 | 2021-09-16 | 三菱瓦斯化学株式会社 | ポリアセタール樹脂組成物、押出成形品および射出成形品 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1896992A (en) * | 1930-02-06 | 1933-02-07 | Agren Ernst Malcus | Arrangement in striking tools |
US2899934A (en) * | 1956-01-19 | 1959-08-18 | salengro | |
US3179185A (en) * | 1962-06-14 | 1965-04-20 | Chicago Pneumatic Tool Co | Demolition tool with shock attenuating means |
GB1152119A (en) * | 1966-11-29 | 1969-05-14 | Atlas Copco Ab | Improvements in Recoil Vibration Damped Percussive Machine |
US3592275A (en) * | 1969-04-11 | 1971-07-13 | Acker Drill Co Inc | Spring loaded adapter for drill rods and core barrel |
CS149009B1 (de) * | 1971-02-01 | 1973-05-24 | ||
BE788418A (fr) * | 1971-09-08 | 1973-01-02 | Ingersoll Rand Co | Macanisme de declenchement d'outil a moteur |
US4102410A (en) * | 1975-03-19 | 1978-07-25 | Ross Frederick W | Resilient work-coupled impact device |
DE3826213A1 (de) | 1988-08-02 | 1990-02-15 | Bosch Gmbh Robert | Bohr- oder schlaghammer |
ATE84850T1 (de) * | 1989-01-11 | 1993-02-15 | Sulzer Ag | Hydraulischer bohrhammer. |
DE4415348A1 (de) | 1994-05-02 | 1995-11-09 | Hilti Ag | Bohr- und Meisselgerät |
US5573075A (en) | 1995-07-05 | 1996-11-12 | T.C. Service Company | Pneumatic impact tool having improved vibration and noise attenuation |
US5626199A (en) * | 1995-07-05 | 1997-05-06 | T.C. Service Company | Pneumatic impact tool having improved vibration and noise attenuation |
SE510057C2 (sv) * | 1997-08-07 | 1999-04-12 | Wiklund Henry & Co | Utloppskanal i tryckmediumdriven slagmekanism |
-
1999
- 1999-07-20 DE DE19933972A patent/DE19933972A1/de not_active Withdrawn
-
2000
- 2000-05-16 DE DE50001515T patent/DE50001515D1/de not_active Expired - Lifetime
- 2000-05-16 WO PCT/DE2000/001549 patent/WO2001005558A1/de active IP Right Grant
- 2000-05-16 EP EP00938558A patent/EP1202840B1/de not_active Expired - Lifetime
- 2000-05-16 CN CNB008105693A patent/CN1247365C/zh not_active Expired - Fee Related
- 2000-05-16 US US10/048,738 patent/US6675908B1/en not_active Expired - Fee Related
- 2000-05-16 JP JP2001510628A patent/JP2003505257A/ja active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO0105558A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2425503A (en) * | 2005-04-28 | 2006-11-01 | Bosch Gmbh Robert | Hand machine tool striking mechanism unit |
GB2425503B (en) * | 2005-04-28 | 2007-12-05 | Bosch Gmbh Robert | Hand Machine Tool Striking Mechanism Unit |
Also Published As
Publication number | Publication date |
---|---|
DE50001515D1 (de) | 2003-04-24 |
DE19933972A1 (de) | 2001-01-25 |
WO2001005558A1 (de) | 2001-01-25 |
CN1361726A (zh) | 2002-07-31 |
US6675908B1 (en) | 2004-01-13 |
CN1247365C (zh) | 2006-03-29 |
EP1202840B1 (de) | 2003-03-19 |
JP2003505257A (ja) | 2003-02-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1202840A1 (de) | Bohr- oder schlaghammer | |
DE19505068C2 (de) | Schlagwerkzeug | |
DE10253421B4 (de) | Schlagbohrer | |
EP2512751B1 (de) | Handwerkzeugmaschine mit einer schwingungstilgervorrichtung | |
DE102006000375A1 (de) | Handwerkzeuggerät mit Entkoppelungsanordnung | |
EP2512750B1 (de) | Handwerkzeugmaschine mit einer schwingungstilgervorrichtung | |
CH669756A5 (de) | ||
EP2029326A1 (de) | Schlagwerk mit einem schlagbolzen und einer zugeordneten fangvorrichtung | |
DE19730198B4 (de) | Wellenkupplung | |
EP0663270B1 (de) | Schlag- oder Drehschlaghammer | |
WO2021094213A1 (de) | Schlagwerksanordnung | |
DE19950807B4 (de) | Schlagwerkzeug mit einem Pufferelement | |
DE102009046479A1 (de) | Handwerkzeugmaschine | |
EP2560794B1 (de) | Handwerkzeugmaschinenvorrichtung | |
CH626824A5 (en) | Powered hand tool | |
DE102006056848A1 (de) | Pneumatisches Schlagwerk einer Handwerkzeugmaschine | |
DE3335795A1 (de) | Bohrhammer | |
EP2822734A1 (de) | Handwerkzeugmaschinenvorrichtung | |
DE3624153A1 (de) | Motorbetriebener hammer | |
DE3335553A1 (de) | Bohrhammer | |
DE10215664A1 (de) | Mittelpufferkupplungsanordnung | |
EP2283978A2 (de) | Handwerkzeugmaschinenvorrichtung | |
EP0312831B1 (de) | Vibrationsschutzvorrichtung bei einem druckluftbetätigten Meisselhammer | |
CH669142A5 (de) | Presslufthammer. | |
WO2021094214A1 (de) | Schlagwerksanordnung |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20020220 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
17Q | First examination report despatched |
Effective date: 20020528 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Designated state(s): CH DE GB LI |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: NV Representative=s name: SCINTILLA AG, DIREKTION Ref country code: CH Ref legal event code: EP |
|
REF | Corresponds to: |
Ref document number: 50001515 Country of ref document: DE Date of ref document: 20030424 Kind code of ref document: P |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20031222 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20110523 Year of fee payment: 12 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20120516 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20120516 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 20130522 Year of fee payment: 14 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20130723 Year of fee payment: 14 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 50001515 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20140531 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20140531 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 50001515 Country of ref document: DE Effective date: 20141202 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20141202 |