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(11)

EP 2 621 680 A1

(12)

(43) Date of publication: 07.08.2013 Bulletin 2013/32 (21) Application number: 10857654.7 (22) Date of filing: 27.09.2010

(51) International Patent Classification (IPC):  B25F 5/00(2006.01) B24B 23/02(2006.01) (86) International application number: PCT/CN2010/077356 (87) International publication number: WO 2012/040891 (05.04.2012 Gazette 2012/14)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR (71) Applicant: Bosch Power Tools (China) Co., Ltd. Zhejiang 310052 (CN)	(72) Inventors: FU, Jizhong Zhejiang 310052 (CN) FAN, Jiahao Zhejiang 310004 (CN) (74) Representative: Bee, Joachim et al Robert Bosch GmbH Wernerstrasse 1 Postfach 30 02 20 70442 Stuttgart 70442 Stuttgart (DE)