## Description 

[0001] Thepresentinvention relatestoan electricpow- er work device. 

[0002] There is a conventional electric chain saw in- cluding abody case accommodating a motortherein,and a battery part, in which a battery is mounted, formed in a rear end part of the body case (see Japanese Patent No. 5530186, for example). Such a chain saw is allowed to have a larger battery than a case where a battery is accommodated in the body case. 

[0003] The conventional chain saw described above includes a top handle formed on an upper part of the body case and a side handle on the left side surface of the body case. In this configuration, an operator holds the sidehandlewith thelefthand and holds the tophandle with the right hand. In the conventional chain saw de- scribed above, the battery part and the battery greatly protrude rightward with respect to the top handle. 

[0004] When the operatormoves thechain saw slightly awayfromthe operatorto cutan objectrelativelyfarfrom the operator, it is preferable that the operator slightly ex- tend the right arm from the top handle toward the rear of the body case. However, in the conventional chain saw described above, the palm or wrist of the right hand in- terferes with the battery part or a right side part of the battery so that the right hand opens rightward with re- spect to the top handle. Accordingly, there is a problem that it is difficult to cut the object relatively far from the operator. Thus, there is a risk that the battery part and battery of the conventional chain saw may interfere with a movement of the hand. 

[0005] The present invention is intended to provide an electric power work device to solve the above-described problem,which reduces interferencewith a palm holding a top handle or a wrist during operation even when a large battery is mounted, and which improves handling during operation. 

[0006] A first aspect of the present invention provides an electric power work device including a body case; a worktoolprotruding forward froma frontside with respect to the body case; a motor to drive the work tool; and a battery to supply electric power to the motor. The motor is accommodated in the body case. A top handle is ex- tended in a longitudinaldirection atan upside withrespect to the body case and a side handle is provided at one of a right side surface and a left side surface of the body case.The batteryisdetachably mounted in a batterypart formed behind the top handle. Further, an interference reduction part is formed behind the top handle to reduce interference witha palmholding the tophandle ora wrist. The interference reduction part is configured that an up- per end part of a part of the body case, facing a front surface of the battery, is positioned lower than an upper end part of the top handle, at a corner between a front surface of the battery part and the other of the right side surface and the left side surface. 

[0007] A second aspect of the present invention pro- 

vides an electric power work device including a body case;aworktoolprotrudingforward froma frontside with respect to the body case; a motor to drive the work tool; and a battery to supply electric power to the motor. The motor is accommodated in the body case. A top handle is extended in a longitudinal direction at an upside with respect to the body case and a side handle is provided at one of a right side surface and a left side surface of the body case. The battery is detachably mounted in a battery part formed behind the top handle. Further, an interference reduction part is formedbehind the top han- dle to reduce interference with a palm holding the top handle or a wrist. The interference reduction part is con- figured that a recess is formed on an upper part of the front surface of the battery with respect to the front sur- face of the battery, at a corner between the front surface of the battery and the other of the right side surface and the left side surface. 

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[0008] A third aspectof the presentinvention provides an electric power work device including a body case; a worktoolprotruding forwardfroma frontside with respect to the body case; a motor to drive the work tool; and a battery to supply electric power to the motor. The motor is accommodated in the body case. A top handle is ex- tended ina longitudinaldirection atanupside with respect to the body case and a side handle is provided at one of a right side surface and a left side surface of the body case.The batteryisdetachably mountedin a batterypart formed behind the top handle. Further, an interference reduction part is formed behind the top handle to reduce interference with a palmholding the top handleora wrist. The interference reductionpartisconfigured thatan axis running through a center in a lateral direction of the bat- tery part is positioned at a side, closer to the one of the right side surface and the left side surface, in the lateral direction with respectto an axisin a longitudinaldirection running through a center in the lateral direction of a grip- ping part of the top handle. 

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[0009] A fourth aspect of the present invention pro- vides an electric power work device including a body case;aworktoolprotrudingforward froma frontside with respect to the body case; a motor to drive the work tool; and a battery to supply electric power to the motor. The motor is accommodated in the body case. A top handle is extended in a longitudinal direction at an upside with respect to the body case and a side handle is provided at one of a right side surface and a left side surface of the body case. The battery is detachably mounted in a battery part formed behind the top handle. An interfer- ence reduction part is formed behind the top handle to reduce interference with a palm holding the top handle or a wrist. The interference reduction part is formed by the battery mounted in the battery part so as to have a front end part thereof positioned at a side closer to the one of the right side and the left side with respect to a rear end part thereof. 

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[0010] A fifth aspect of the present invention provides an electric power work device including a body case; a 

