Patent ID: 11865683
Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 8:
9. A powered fastener driver comprising:
a housing;
a nosepiece coupled to the housing and extending therefrom;
a driver blade movable within the nosepiece between a ready position and a driven position, the driver blade including a rear surface and a fin extending from the rear surface;
a canister magazine coupled to the nosepiece in which collated fasteners are receivable; and
a pusher mechanism coupled to the nosepiece for individually transferring collated fasteners in the canister magazine to a driver channel in the nosepiece in which the driver blade is movable, wherein the pusher mechanism includes:
a feeder arm that is engageable with individual fasteners in the nosepiece for sequentially pushing each of the fasteners into the driver channel in response to movement of the feeder arm toward the driver channel, and
a linkage assembly positioned between the feeder arm and the driver blade, the linkage assembly including;
a first member;
a second member pivotably coupled to the first member by a floating pivot point;
a third member operatively coupled between the first member and the feeder arm, wherein the third member is pivotably coupled to the first member by a first pivot point, and wherein movement of the driver blade from the driven position toward the ready position causes each of the first member and the third member to pivot about the first pivot point in a first rotational direction;
a first spring disposed between the first member and the third member, wherein the first spring is configured to bias the first member into alignment with the third member, and wherein the first member is configured to selectively move relative to the third member about the first pivot point against the bias of the first spring in the first rotational direction as the driver blade moves from the driven position toward the ready position; and
a second spring exerting a biasing force on the first member in a second rotational direction opposite the first rotational direction;

wherein the second member is pivotably coupled to the housing by a second pivot point, wherein each of the first pivot point and the second pivot point are fixed relative to the housing, and wherein the floating pivot point is positioned between the first pivot point and the second pivot point,
wherein the linkage assembly is movable to advance the feeder arm toward the driver channel in response to contact with the driver blade as the driver blade moves from the driven position toward the ready position, and
wherein the floating pivot point is selectively movable relative to the housing by engagement between the fin and the linkage assembly as the driver blade moves from the driven position toward the ready portion thereby causing movement of the linkage assembly.