| 摘要 |
A chain saw comprises an oil tank 100 and an oil cap 42. The oil cap 42 comprises a cap body 43 and a valve member 75. The cap body 43 may comprise a communicating path 67 communicating an inside of the oil tank 100 to an outside of the oil tank 100. The valve member 75 may be attached to the cap body 43 and covers the communicating path 67. The valve member 75 may be a sheet-shaped portion made from elastomer. The valve member 75 may comprise a bulging part 75a and a projecting part 75b. The bulging part 75a may be curved in a dome shape. The projecting part 75b may project from the bulging part 75a and comprises a slit 75c at its top portion. |
