Patent ID: 7581323

Claim:
A circular saw comprising: a motor housing having a first end portion and a second end portion, the outer end of said second end portion having a recess configured to receive a removable battery pack in locking engagement, including a deeper portion of said recess for receiving a stem portion of a battery pack; a motor assembly disposed within said housing; a rotary blade assembly including a circular blade with an axis of rotation, said assembly having a first predetermined weight and being disposed at said first end portion of said motor housing, said first predetermined weight multiplied by the distance from said assembly to a vertically oriented first gripping portion of a handle assembly defining a first moment arm; a battery pack having a protruding stem portion and a second predetermined weight, said stem portion being inserted in said deeper portion of said recess when said battery pack is placed in said recess of said second end portion of said housing, said battery pack, said motor assembly and said rotary blade assembly being configured and arranged to be in longitudinal alignment with one another along said axis of rotation, said second predetermined weight multiplied by the distance from said battery pack to a vertically oriented first gripping portion of a handle assembly defining a second moment arm; said handle assembly extending from said motor housing, said handle assembly having a vertically oriented first gripping portion that is configured to be generally perpendicular to said axis of rotation, said first portion being generally centered between said first and second housing end portions along said axis of rotation, and said housing having a predetermined length along said axis of rotation, and said first moment arm is substantially equal to said second moment arm.