| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an excavation tool capable of suppressing damages of an engaging part of an excavation pawl and a holder due to detachment of the excavation pawl, demonstrating sufficient detention force by a simple shape, and maintaining it. <P>SOLUTION: An excavation tool 1 (2) includes an excavation pawl 10 (30) and a holder 20 (40), and the excavation pawl has an excavation part 11 (31) on the front end side and is provided with a base part 12 (32) where a hole part 13 opened on a rear end side or a shaft part (33) projected to the rear end side is formed. The holder includes a shaft part 21 to be inserted to the hole part of the excavation pawl or a hole part (41) to which the shaft part of the excavation pawl is to be inserted, the outer peripheral surface of the shaft part and the inner peripheral surface of the hole part are tapered to be adapted to each other, grooves 14, 15, 22 and 23 extending in the insertion direction A of the shaft part are formed on one or both of the outer peripheral surface of the shaft part and the inner peripheral surface of the hole part facing each other in the state of inserting the shaft part to the hole part, and rod-like elastic bodies 28 and 29 extending in the insertion direction of the shaft part, fitted to the grooves and held by the shaft part and the hole part are provided. <P>COPYRIGHT: (C)2012,JPO&INPIT |
