(19) (12) EUROPEAN PATENT APPLICATION (11) EP 3 800 013 A1 (43) Date of publication:  07.04.2021 Bulletin 2021/14 (21) Application number:  20166067.7 (22) Date of filing:  26.03.2020 B25F 5/00 (2006.01) B23D 57/02 (2006.01) B25F 5/02 (2006.01) B27B 17/00 (2006.01) (51) Int Cl.: (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 RS SE SI SK SM TR Designated Extension States:  BA ME Designated Validation States:  KH MA MD TN (30) Priority: 26.03.2019 JP 2019058028 (71) Applicant:  Yamabiko Corporation Ohme-shi Tokyo 198-8760 (JP) (72) Inventors:  • OSAWA, Hisato Ohme-shi, Tokyo 198-8760 (JP) • NAKANO, Kenji Ohme-shi, Tokyo 198-8760 (JP) • TAKEUCHI, Noriyuki Ohme-shi, Tokyo 198-8760 (JP) (74) Representative:  Dehns St. Bride’s House  10 Salisbury Square London EC4Y 8JD (GB) (54) ELECTRIC POWER WORK DEVICE (57) Provided is an electric power work device (1A; 1B; 1C), which is a chain saw, including: a body case (10);a cutting part (20) protruding forward from the body case (10); a motor (30) to drive the cutting part (20), and a battery(90) .A top handle (40)isprovided atan upside with respect to the body case (10), and, a side handle (50) is provided at a left side surface of the body case (10) .The battery (90)isdetachablymounted inabattery part (12) formed behind the top handle (40). Further, in- terference reduction part (100; 200; 300; 400; 500) is formed behind the top handle (40)to reduce interference with a palm holding the top handle (40) or a wrist. EP 800 013 A1 Printed by Jouve, 75001 PARIS (FR) UP 1A FRONT-<-1 > REAR DOWN 4 40° 436