| 摘要 |
The invention relates to an auto tensioner of a chain saw. A spiral guide groove ( 16 ) of the disk ( 15 ) engages with a protrusion 10 a of a slider piece ( 10 ) and the slider piece ( 10 ) is slidably stored in a guide portion ( 9 ) formed in a chain cover ( 2 ) via a spring ( 14 ). A tensioner ( 11 ) comprising a protrusion ( 11 ) engaged with a guide bar is slidably stored in the slider piece 10 via a coin spring ( 12 ). The protrusion ( 10 a) contacts an outer circumference face of the spiral guide groove 16 on a diameter passing through a rotating center of the disk, and an unshown nut for engaging with a stud bold 6 provided on an engine cover side is attached on the rotating center of the disk ( 15 ). A rotation of the disk enables to fix the chain cover ( 2 ) and move the guide bar.
|
