Abstract: A unique hybrid shop-style and continuous-duty vacuum collector using a large diameter filter has the advantages and capabilities of both specialized types. Because of efficient design and the use of pleated paper, the effective filter surface area is many times that of a conventional shop vacuum. This enables extended runs between filter cleanings in a reliable portable machine intended for both the hobbyist and the commercial shop operator. The filter cleaning mechanism breaks away the dirt accumulated on the filter surfaces by means of a plurality of shock generators symmetrically located at the filter circumference. These peripherally-generated shocks and the resulting filter oscillations are efficiently distributed by the design to be exactly parallel to the pleated paper surfaces, in order to protect the filter from damage. A mechanical sail interlock prevents further damage by precluding accidental activation of the filter cleaning mechanism during the dirt collection process.

Abstract: A unique hybrid shop-style and continuous-duty vacuum collector of reasonable size offers the advantages and capabilities of both specialized types, by substantially multiplying the conventional shop vacuum effective filter surface area, while preserving machine portability. The preferred embodiment employs three cylindrical pleated-paper filters to collect a wide range of sizes and weights of mixed dust and particulate debris. It is intended for both the hobbyist and the commercial shop operator who desire extended runs between filter cleanings. The filter cleaning mechanism efficiently breaks away the filtered accumulation, but protects the filter material from damage, by the carefully oriented application of mechanical shocks to generate cleaning oscillations of the filter surfaces only in their own planes. A mechanical sail interlock prevents additional filter damage by precluding accidental activation of the filter cleaning mechanism during the dirt collection process.