Patent ID: 8266761

Claim:
A vacuum comprising: a housing; a vacuum source disposed in said housing; a vacuum filter disposed in said housing upstream of said vacuum source; a filter cleaning device including a filter cleaning motor drivingly connected to a filter cleaning mechanism; a multi-position switch mounted to said housing, said multi-position switch having at least three switch positions and including a first micro-switch and a second micro-switch which provide different activation states depending upon the position of the multi-position switch, the micro-switches having separate first connectors and a second connector common to the first and second micro-switches; a power source in communication with said first and second micro-switches via first and second separate ratio circuits coupled to the respective first connectors, the first and second ratio circuits providing differing ratio signal outputs depending upon differing activation states of said first and second micro-switches; and a controller connected to said first and second ratio circuits and said first and second micro-switches via only the second common connector and providing multiple control signals for activating said vacuum source and said filter cleaning device based upon input from said first and second ratio circuits.