| 摘要 |
PROBLEM TO BE SOLVED: To reduce an upward projected part of a flexible duct and to prevent occurrence of bending, etc., on a bending part. SOLUTION: The flexible duct 1 to hold a polishing material supply passage to supply a powder polishing material to a blast gun 6 to take a reciprocating linear motion in a working chamber and a high pressure air tube to supply high pressure air to inject the polishing material from the blast gun 6 integrally in a bundled state, an elbow type guide member 2 provided at an upper curved part of the flexible duct 1 and to hold the opposite side of the side connected to the blast gun 6 of the flexible duct 1 roughly in a horizontal state, a supporting means 5 to support the one end side of an elbow part of the guide member 2 free to move in the vertical direction is a state of holding it horizontally and a damper 3 to display force to lift up the guide member 2 supported by the supporting means 5 constantly upward are provided.
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