Patent ID: 11919097
Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 8:
9. A drive mechanism for a reciprocating saw, the drive mechanism comprising:
a motor including a pinion;
a gear coupled to and driven by the pinion;
a hub coupled to the gear for rotation with the gear;
a spindle reciprocatable relative to the motor;
a connecting rod extending between the hub and the spindle to transmit rotation of the hub into reciprocation of the spindle; and
a clutch assembly coupled between the gear and the hub to selectively transmit a drive force from the gear to the hub, the clutch assembly including
a first disk coupled to the gear,
a second disk coupled to the hub,
a biasing member positioned between the hub and the gear and in direct physical contact with the hub to bias the first and second disks into frictional engagement with each other,
a threaded fastener having a threaded portion and a head that defines a shoulder, the threaded fastener extending through the gear and threadably engaging the hub to couple the hub to the gear, wherein tightening the threaded fastener pulls the hub toward the gear to preload the biasing member, and
a bushing positioned about the threaded portion of the threaded fastener and between the shoulder and the hub;

wherein the bushing includes a first end that contacts the shoulder and a second end that contacts the hub.