초록 ▼

A chain saw guide bar has self-contained mechanism to force movement of the guide bar away from a drive sprocket to tension the saw chain. The mechanism includes a bearing surface that engages a mounting stud on the chain saw housing and a rotatable portion which upon rotation causes axial displacem

A chain saw guide bar has self-contained mechanism to force movement of the guide bar away from a drive sprocket to tension the saw chain. The mechanism includes a bearing surface that engages a mounting stud on the chain saw housing and a rotatable portion which upon rotation causes axial displacement of the bearing surface in contact with the stud.

대표청구항 ▼

[ We claim:] [1.] A chain saw guide bar adapted for mounting to a chain saw having a chain saw housing including a projection positioned forward of a drive sprocket, said guide bar comprising:an elongated bar defining a bar length and having opposed side faces, a rear end, a forward end and peripher

[ We claim:] [1.] A chain saw guide bar adapted for mounting to a chain saw having a chain saw housing including a projection positioned forward of a drive sprocket, said guide bar comprising:an elongated bar defining a bar length and having opposed side faces, a rear end, a forward end and peripheral guide edges for guiding a loop of saw chain from the rear end to and around the forward end and back to the rear end;a mounting slot at the rear end of the bar adapted to receive the projection of the chain saw housing and to permit sliding movement of the bar relative to the projection and directed along the length of the bar toward and away from the drive sprocket; anda configured cavity between the side faces and encompassing the mounting slot, said configured cavity including a formed portion, and a tensioning mechanism including a rotatable driver portion trapped between the side faces within the formed portion, said driver portion exposed in part through at least one of said side faces, and provided with a grip portion enabling an operator to manually rotate the driver portion, and a bearing portion of said tensioning mechanism projected into the mounting slot and including a bearing edge for engaging the projection, said bearing portion being advanced toward the projection by rotation of the driver portion for axial movement of the guide bar relative to the projection and thereby movement of the guide bar relative to the drive sprocket.