Patent ID: 7614459

Claim:
A method of activating a drive system with a portable drive source, the drive system including a drive shaft displaceable between a disengaged position, in which an engagement gear of the drive system is disengaged and an engaged position, in which the engagement gear of the drive system is engaged, the method comprising releasably engaging the drive system with the drive source without displacing the drive shaft, and, with the drive source engaging the drive system, performing at least two actions between the drive source and the drive system to effect activation of the drive system, the two actions including displacing the drive shaft to the engaged position and activating the drive source, wherein performing any one of the two actions without the other of the two actions will not activate the drive system, wherein a stop plate is coupled with the drive shaft, and wherein in the disengaged position, the stop plate engages a fixed member to prevent rotation of the drive shaft, the performing step comprising disengaging the stop plate from the fixed member.