| 摘要 |
A duct scrapping device for scrapping the interior surface of a duct. The device includes a pair of arm attachment components that are each mounted on a tubular member. The tubular members are kept in an aligned relationship relatively to on e another by a spacing rod extending therebetween. The device also includes an elongated blade supporting structure. A first and a second spacing arm are provi de for pivotally linking the blade supporting structure to the first and second arm att achment components. At least one blade is mounted on the blade supporting component. Th e device further includes a first spacing arm and a second spacing arm, the first spacing arm having a first spacing arm first longitudinal end and a first spacing arm se cond longitudinal end, the second spacing arm having a second spacing arm first longitudinal end and a second spacing arm second longitudinal end, the first spa cing arm first longitudinal end being pivotally attached to the first arm attachment structure, the first spacing arm second longitudinal end being pivotally attached to the bl ade supporting structure first longitudinal end, the second spacing arm second longi tudinal end being pivotally attached to the second arm attachment structure, the second spacing arm first longitudinal end being pivotally attached to the arm attachmen t structure second longitudinal end. 17
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