초록 ▼

A fastener driving tool includes a flywheel rotated by a drive unit and having a wheel rim formed with teeth, an impact member having a mating toothed unit movable with a carrier frame to engage the teeth so as to be swept thereby to an end-stroke position to enable a striking rod to drive a fastene

A fastener driving tool includes a flywheel rotated by a drive unit and having a wheel rim formed with teeth, an impact member having a mating toothed unit movable with a carrier frame to engage the teeth so as to be swept thereby to an end-stroke position to enable a striking rod to drive a fastener into a targeted workpiece, and an actuating unit configured to actuate the carrier frame to move from an upper position to a lower position in response to a triggering action of a trigger so as to move the mating toothed unit from an disengaging position to an engaging position.

대표청구항 ▼

1. 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 r

1. 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; andan 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. 2. The fastener driving tool according to claim 1, wherein said actuating unit includes a cam member which has a cam surface, and which is pivotably mounted on said first weight end, and a cam follower which is disposed on said positionable end such that, by virtue of caroming action between said cam surface and said cam follower, said positionable end is displaced toward the lower position when said first power end is actuated to move said first weight end toward the actuating position. 3. The fastener driving tool according to claim 2, further comprising: a counteracting lever which is pivotally mounted on said main housing, and which has a second power end that is configured to be actuated by said cam member when said first weight end is moved toward the actuating position, and a second weight end that is disposed to be angularly displaceable between a hooked position, where said second weight end is retained to said positionable end, and an unhooked position, where said second weight end is disengaged from said positionable end to permit movement of said positionable end toward the lower position; and a lever biasing member disposed to counteract said second power end against the actuation of said cam member by virtue of biasing said second weight end toward the hooked position, thereby ensuring holding of said positionable end in the upper position. 4. The fastener driving tool according to claim 1, wherein said actuating unit further includes a solenoid of which a plunger is disposed to actuate said first power end of said actuating lever so as to displace said first weight end to the actuating position. 5. The fastener driving tool according to claim 1, further comprising: a guiding rod which is disposed securely on said carrier frame and which extends along the striking route to permit sliding movement of said impact member therealong; and a rod biasing member which is disposed to surround said guiding rod to bias said impact member to the ready position. 6. The fastener driving tool according to claim 5, further comprising an elongated guiding rail which is disposed on said guiding segment of said carrier frame to serve as said guideway, said impact member having at least one roller which is disposed to roll on said guiding rail. 7. The fastener driving tool according to claim 1, wherein said drive unit includes a motor which has an output shaft rotatable about a shaft axis parallel to the wheel axis, a drive gear coupled for rotation with said output shaft, a transmitting gear coaxially rotatable with said flywheel, and a toothed belt chained on said drive and transmitting gears. 8. The fastener driving tool according to claim 1, wherein said pivot end of said carrier frame is pivotably mounted on said front end of said main housing such that the upper and lower positions of said positionable end are rendered relative to said rear end.