| 摘要 |
<p>1,119,043. Boring earth. STABILATOR A.B. 10 Aug., 1965 [11 Aug., 1964], No. 34166/65. Heading E1F. A tool for drilling loose earth comprises a percussive boring head 1 having grooves 19 and carried by rods 2, 3, and a tube 9 surrounding the rods and having an outlet at its end remote from the head for the discharge of debris and the drilling liquid which is discharged from the head. The head or only its outer part 8 may he left in the hole. A fitting is arranged to drive the tube with the head and has the outlet for the debris and liquid.</p> |
