| 摘要 |
<p>A blade device, wherein a mounting part (38) of box construction having a mounting hole (40) opening in lateral direction and having a non-circular cross section in a direction crossing the lateral direction is installed at the rear of a body blade body (21), a fitting part (54) fitted to the mounting hole (40) of the body blade body (21) so as to be inserted and extracted is installed at the rear of a width increasing blade body (22), a locking device (23) is installed to lock the fitting part (54) fitted to the mounting hole (40), and when a width is increased, the fitting part (54) is fitted to the mounting hole (40) from the outer end side thereof and the width increasing blade body (22) is disposed at the end part of a body blade body (21) and when the width increasing blade body (22) is stored, the fitting part (54) is fitted to the mounting hole (40) from the inner end side thereof and the width increasing blade body (22) is storably disposed at the rear of the body blade body (21), whereby since a load applied to the wide increasing blade body (22) is supported on the mounting part (38) of the box construction to reduce a burden on the locking device (23) when the width is increased, the locking device (23) can be attached and detached easily.</p> |
