| 摘要 |
A vacuum system with a blower, a flexible hose connected to an intake opening and a discharge duct for transporting the materials to a collection zone has a suction nozzle mounted on the outer end of the flexible hose. The nozzle is formed by a cylindrical collar connected to the outer end of the flexible hose, a pick-up tube mounted within the collar so as to define an annular space therebetween and projecting forwardly from the forward end of the collar to an open circular mouth into which material to be picked up can be drawn to enter the pick-up tube to be transported by the hose to the blower for discharge to the collection zone.
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