Abstract: A power tool includes a motor, an arbor driven by the motor, a rotatable cutting tool disposed on the arbor and having a rotational axis, the cutting tool further having a hole, first and second clamps connected to the arbor and clamping the blade, wherein one of the cutting tool and at least one of the first and second clamps and arbor have a first drive surface for contacting a second drive surface on the other of the cutting tool and the at least one of the first and second clamps and arbor, the second drive surface being movable between a first position contacting the first drive surface and a second position bypassing the first drive surface. The second drive surface is resiliently connected to the other of the cutting tool and the at least one of the first and second clamps and arbor. At least one metal strip connects the second drive surface to the other of the blade and the at least one of the first and second clamps and arbor.

Abstract: A cordless power-operated device, such as a saw 20, is powered by a low level D.C. voltage provided by battery pack cells to operate the saw in a cordless mode. The cells are housed in a container 32 which fits into a cavity 23 formed in a housing 22 of saw 20. Another container 66 includes a first section 64 which is shaped externally in the same configuration as container 32. First section 64 houses a voltage converter 62 which converts conventional A.C. voltage, such as 120 volts at 60 Hz, to the low level D.C. voltage required to operate saw 20. Container 66 can be inserted into cavity 23 of saw 20 and voltage converter 62 can be connected to a conventional A.C. source to operate the saw in a corded mode. Container 66 also includes a second section 68 which houses a cooling motor 70. Cooling motor 70 provides powered cooling of saw motor 28, the cooling motor and voltage converter 62.