| 摘要 |
PROBLEM TO BE SOLVED: To provide a boom raising mechanism of a simple structure, capable of extending a boom used in a bucket-type excavator and others from a prescribed height of the boom to a desired height.SOLUTION: A bucket-type excavator has a boom fitted on a swing post installed on a base, a working arm fitted on an end of the boom, and a bucket fitted on an end of the working arm, each in a way that allows swinging, and cylinders are fitted along the boom and the working arm, between the swing post and the boom, between the boom and the working arm, and between the working arm and the bucket. A boom raising mechanism for the bucket-type excavator has a riser pole fitted detachably between the swing post and the boom for dividing the boom into a lower boom and an upper boom, and the boom position may be switched as appropriate between a standard fitting position in which the lower boom and the upper boom form an angle and a straight fitting position in which the lower boom and the upper boom are extended straight. |
