Patent ID: 8511532

Claim:
A fastener driving tool for driving a strip of fasteners loaded in a magazine into a targeted workpiece, said fastener driving tool comprising: a main housing having front and rear ends opposite to each other in a longitudinal direction, and a frame body which is disposed between said front and rear ends; a nosepiece which is adapted to be fitted with the magazine, and which is disposed forwardly of said front end of said main housing; a striking rod which is disposed to be linearly movable along a striking route in the longitudinal direction through the nosepiece for driving a leading one of the fasteners, and which has a butt end; a flywheel rotatably mounted on said frame body about a wheel axis that is oriented in a transverse direction transverse to the longitudinal direction, and having a wheel rim which are formed with teeth; a drive unit disposed on said frame body, and coupled to drive said flywheel to rotate about the wheel axis, thereby running said teeth along a cycling path while imparting said teeth with kinetic energy; a carrier frame having a pivot end pivotably mounted on said main housing about a pivot axis, a positionable end which is opposite to said pivot end in a lengthwise direction, and which is angularly movable about the pivot axis between upper and lower positions, and a guiding segment which defines a guideway extending in the lengthwise direction; an impact member disposed on said guiding segment and movable along said guideway between a ready position and an end-stroke position, and connected to said butt end of said striking rod to enable said striking rod to drive the fastener when said impact member is forced to dash to the end-stroke position, said impact member having a mating toothed unit configured such that, in the ready position, as a result of displacement of said carrier frame from the upper position to the lower position, said mating toothed unit is moved from a disengaging position to an engaging position where said mating toothed unit is thrust into kinetic contact with said teeth so as to be swept thereby with the kinetic energy that forces said impact member to the end-stroke position; a carrier biasing member disposed to bias said carrier frame toward the upper position; and an actuating unit configured to actuate said positionable end to move from the upper position to the lower position in response to a triggering action; wherein said actuating unit includes an actuating lever which is pivotally mounted on said main housing, and which has a first power end actuated by electromagnetism as a result of the triggering action, and a first weight end coupled to said positionable end such that, when said first power end is actuated to move said first weight end from a non-actuating position to an actuating position, said positionable end is displaced to the lower position.