PROBLEM TO BE SOLVED: To improve workability in charging of a battery pack used as a power source of a back pack blast machine.SOLUTION: The back pack blast machine comprises: a back pack frame having at least a back plate part 12 that fits along a back of an operator and allowing the operator to lift the back plate part 12 onto his or her back by a shoulder strap 13; a volute case 21, which is mounted on the back pack frame behind the back plate part 12; a centrifugal fan 22, which is rotatably supported in the volute case 21; an electric motor 23, which is installed on the volute case 21 and rotates the centrifugal fan 22; and a battery pack 40, which is detachably installed on a fitting part 16 set on the back pack frame and feeds power to the electric motor 23.SELECTED DRAWING: Figure 2
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