Patent ID: 8250958

Claim:
An electric saw device, comprising a first saw blade and a second saw blade, wherein the first saw blade and the second saw blade are driven to rotate about an axis of rotation by a small transmission shaft and a large transmission shaft respectively to rotate in opposite directions, and the small transmission shaft is driven to rotate by a power output shaft; a round rib is disposed on an inner surface of the first saw blade, the round rib is round with respect to the axis of rotation such that a center axis of the round rib is substantially coaxial with the axis of rotation, the round rib having a radial width and a top end surface; at least three recessed holes are disposed in the top end surface of the round rib within the radial width and are disposed at equal angle intervals about to the axis of rotation; and a steel ball in each of the recessed holes, each steel ball protruding out of the corresponding recessed hole against an inner surface of the second saw blade so as to limit a distance between the first saw blade and the second saw blade; wherein a first round protruding wall is disposed on an inner surface of the second saw blade, the first round protruding wall is round with respect to the axis of rotation, and an inner diameter of the first round protruding wall is slightly greater than an outer diameter of the round rib by a radial distance such that the first round protruding wall is disposed outside the round rib and the radial width of the round rib is greater than the radial distance between the first round protruding wall and the round rib.