Patent ID: 7567058

Claim:
A power tool comprising: a power tool main body having a motor, a reduction unit and an output unit; and a battery pack accommodating therein a battery, the battery pack being detachably attached to the power tool main body, wherein the battery pack is provided with an attaching portion having a positive and a negative terminal for connecting the battery to the power tool main body and at least two engaging portions to be mechanically coupled to the power tool main body, wherein the power tool main body is provided with an attached portion having a protruding engaged portion and one or more L-shaped engaged portions respectively corresponding to said at least two engaging portions of the battery pack respectively, wherein each of the engaging portions of the battery pack includes an insertion restricting portion and an attachment securing portion for allowing its corresponding engaged portion to be inserted only in a direction of pressing the attaching portion of the battery pack against the attached portion of the power tool main body, each of the attachment securing portions being coupled to its corresponding engaged portion, wherein at least one of said at least two engaging portions further has a hook engaging portion which is selectively secured with the protruding engaged portion moved from an insertion restricting portion of said at least one engaging portion to an attachment securing portion thereof, wherein each of the attachment securing portions is coupled to its corresponding engaged portion by shifting the battery pack toward a direction perpendicular to the direction of pressing the attaching portion against the attached portion of the power tool main body, and wherein each of the L-shaped engaged portions has a rib extended along said direction perpendicular to the direction of pressing the attaching portion of the battery pack against the attached portion of the power tool main body.