| 摘要 |
PURPOSE:To enable a breaker chisel to be vertically set on the breaking face all the time by a method in which the chisel of a breaker holder is slidably connected with the top periphery of angled supporting protion whose central part is pivotally attached to the tip of an arm with the parallel through hole with the interposition of an oil-pressure cylinder. CONSTITUTION:The central part of an angled supporter 15 is rotatably attached to the tip of an arm 4, and one end 15a of the supporter 15 is connected with the tip of a rod 5 reciprocally moving inside the arm 4 through a link 5a. On the other hand, an oil-pressure cylinder 17 for sliding a breaker is fitted into the central part of the other end 15b' of the supporter 15, and the holder 10 is moved in parallel in the axial line direction of the arm 4 by the oil-pressure cylinder 17. An oil-pressure breaker 3 is also attached to the holder 10 in the same direction as that of the oil-pressure cylinder 17. By this, the breaker 3 can be vertically set to the breaking face all the time. |
