| 摘要 |
PURPOSE:To increase the advancing amount of a breaker regardless of the heights of ceiling by a method in which an angular bracket is slidably inserted into an angular second fitting arm, and the breaker is attached to the bracket. CONSTITUTION:The first fitting arm 12 is rotatably attached to the upper slewing part 2 of an oil-pressure shovel body 1, and a cylinder 13 for operating the first fitting arm is provided between the first fitting arm 12 and the upper slewing part 2. The second fitting arm 14 of an angular cylinder form is attached to the other end of the first fitting arm 12, and the second fitting arm-operating cylinder 15 is provided between the second fitting arm 14 and the first fitting arm 12. A bracket 11 of an angular cylinder form is slidably inserted into the second fitting arm 14, a cylinder 12 for reciprocally moving the breaker is provided between the bracket 11 and the second fitting arm 14, and the breaker 10 is integrally attached to the bracket 11. |
