Patent ID: 6547527
Filing Date: 2003-04-15
Classification: F04B

Abstract:
A portable power unit, said power unit comprising:(a) an internal combustion engine having a drive shaft; (b) a tank having an interior for holding a supply of a pressurized fluid therein, said tank including pressure switch means, responsive to the pressure of the pressurized fluid within said interior of said tank, for actuating an electrical circuit when the pressure of the pressurized fluid within said interior of said tank is below a certain predetermined value; (c) an electrical generator means for generating electricity, said electrical generator means having a first driven shaft, said electrical generator means being powered by rotation of said first driven shaft; (d) a pump means, in communication with the interior of said tank, for pressurizing said fluid into said interior of said tank; said pump means having a second driven shaft, said pump means being powered by rotation of said second driven shaft; (e) a primary drive means for operably coupling said drive shaft to said first driven shaft, said primary drive means comprising: i. a first drive pulley fixedly attached to said drive shaft; ii. a first driven pulley fixedly attached to said first driven shaft; and iii. first drive belt means operably coupling said first drive pulley to said first driven pulley for mutual co-rotation; (f) a secondary drive means for selectively operably coupling said drive shaft to said second driven shaft, said secondary drive means comprising: i. a second drive pulley operably coupled to said drive shaft; ii. a second driven pulley operably coupled to said second driven shaft; iii. second drive belt means operably coupling said second drive pulley to said second driven pulley for mutual co-rotation; and iv. electromagnetic clutch means for selectively causing said drive shaft to be coupled to said second driven shaft for mutual co-rotation when said electromagnetic clutch means is energized, said electromagnetic clutch means being operably interconnected with said pressure switch means so that the actuating of said electrical circuit causes said electromagnetic clutch means to be energized wherein said internal combustion engine is between said electrical generator means and pump means; and (g) an electric fan for cooling said pump means, said electric fan being actuated by said pressure switch means together with said electro-magnetic clutch means.