| 摘要 |
PURPOSE: An excavator is provided to prevent shaking of the bit and to improve quality of the excavated hole. CONSTITUTION: An excavator(100) comprises a driving part, a driving shaft(110), a bit(120), and a guide(130). The driving part generates a driving force for excavation work. The driving shaft is combined with the driving part and delivers the driving force of the driving part. The bit is installed on an end of the driving shaft and provided with the driving force of the driving part to form an excavated hole(210) on a ground(200). The guide is installed on the bit or the bit side driving shaft to keep the bit and the excavated hole concentric, and slides on the excavated hole. |
