초록 ▼

A fastener driving tool of the type utilizing a motor driven energy storing flywheel and a reciprocating fastener driving ram employs a flywheel having a metal peripheral surface that selectively engages a metal surface of the ram in order to drive the ram into engagement with a fastener to be drive

A fastener driving tool of the type utilizing a motor driven energy storing flywheel and a reciprocating fastener driving ram employs a flywheel having a metal peripheral surface that selectively engages a metal surface of the ram in order to drive the ram into engagement with a fastener to be driven into a workpiece. An elastic cord returns the ram to a retracted position when the ram is disengaged by the flywheel, and a pair of elastic bumpers are employed to limit the travel of the ram in the direction of the retracted position and the direction of the fastener engaging position. The ram, bumpers and cords form a subassembly that permits the ram, cord and bumpers to be removed from the fastener as a unit. The cord is made relatively long to reduce the amount of stretch per unit length applied to the cord thereby to increase the life of the cord. The motor and flywheel may be rotated in opposite directions to reduce precessional forces.

대표청구항 ▼

A tool for driving impact driven fasteners into a workpiece comprising: a housing; a ram having a metal surface disposed within said housing and mounted for reciprocation between an upper and a lower position within said housing; a motor mounted to said housing; a flywheel having a metal peripheral

A tool for driving impact driven fasteners into a workpiece comprising: a housing; a ram having a metal surface disposed within said housing and mounted for reciprocation between an upper and a lower position within said housing; a motor mounted to said housing; a flywheel having a metal peripheral surface which is adapted to directly contact said metal surface of said ram, mounted to said housing and rotated by said motor for developing a predetermined amount of energy in said flywheel sufficient to drive a fastener into the workpiece; and means for effecting metal to metal contact between the metal surface of said ram and the metal peripheral surface of said already rotating flywheel thereby to drive said ram into engagement with a fastener wherein energy stored in said flywheel is transferred to said ram to drive said fastener into said workpiece and wherein the metal surface of the ram and the metal peripheral surface of the flywheel are fabricated from steel.