Patent ID: 9636812
Date: 2017-05-02
CPC Classifications: B25C

Claim:
1. A fastener driving apparatus, the apparatus comprising a power source, a control circuit, a motor, a cylinder, a drive mechanism capable of selectively engaging and disengaging a drive piston, said drive piston disposed within said cylinder, said drive piston capable of moving to and from at least a top dead center position and a bottom dead center position in said cylinder, upon being engaged by said drive mechanism, and an anvil, wherein said anvil is operatively coupled to said drive piston, wherein said drive mechanism selectively engages said drive piston to apply a force on said drive piston to move said drive piston within said cylinder and thereafter disengages from and ceases applying a force on said drive piston, wherein when said drive mechanism engages said drive piston to move said drive piston away from said bottom dead center position of said cylinder, a vacuum is generated in the cylinder, which vacuum, after said drive mechanism thereafter disengages said drive piston, acts on said drive piston to cause the said piston to move toward said bottom dead center position of said cylinder, said anvil driving a fastener upon said movement of said drive piston.