| 摘要 |
A chain saw comprises interconnected center links and side links. The side links include front and rear heels having front and bottom contact surfaces, respectively, which slidably engage an edge rail of a chain saw guide bar. The bottom contact surface of at least one of the heels includes a recess formed therein. The recess has an open front end and a closed rear end. The recess is of less width than a width of the respective bottom contact surface, whereby portions of the contact surface straddle the recess. The depth and width of the recess gradually decrease from the front end toward the rear end. During a cutting operation, lubricant enters the recess and creates a pressure which lifts the heel slightly off the rail, eliminating metal to metal contact. |
