Patent ID: 7186281

Claim:
A dust-removing device for a dust-collecting tank of a dust-collecting machine comprising a dust-collecting tank having an outer frame and a filter tank installed inside said outer frame, said filter tank made integral of filter paper, said outer frame is formed with a combining base at a bottom thereof, said filter tank having an inner circumferential wall formed with numerous serrated folds, among said serrated folds are formed numerous conical folded grooves, said dust-removing device installed in said dust-collecting tank, said dust-removing device comprising: a guide frame having a horizontal supporter and a vertical central guide rod, said supporter having opposite ends respectively secured at two corresponding sides of an opening of said combining base under said dust-collecting tank, said central guide rod having a lower end disposed at a central portion of said horizontal supporter, said central guide rod having an upper end fixed to a central portion of a top wall of said dust-collecting tank: a brush base having an outer circumferential edge formed with numerous brushing bristles, said brushing bristles reaching said folded grooves in the inner wall of said filter tank, said brush base has a toggle in a center thereof, said toggle is mounted on said central guide rod and able to move up and down along said guide rod, said brush base together with said brushing bristles is actuated to move up and down to carry out cleaning the inner walls of said folded grooves: and a pull unit consisting of a lower pulley base, an upper pulley base, an outer pulley base, a pull rope and two handles, said lower pulley base positioned on said supporter of said guide frame, said upper pulley base disposed on a topside of said outer frame of said dust-collecting tank, said outer pulley base fixed at a preset location of the lower outer wall of said outer frame, said pull rope extending through said lower pulley base, upper pulley base, and outer pulley base, and having two opposing ends fastened to said brush base, said pull rope able to actuate said brush base to move up and down along central guide rod, said two handles respectively secured at a preset location of two lines of said pull rope exposed to the outer side of said dust-collecting tank, said two handles held and applied with a force by a user's hands to actuate said pull rope to move up and down: and, when cleaning said dust-collecting tank, said two handles are moved downward alternatively and repeatedly letter said pull rope actuate said brush base together with said brushing bristles able to quickly remove dust adhered to the inner wall of said dust-collecting tank, further comprising an extension spring having a first end connected to said outer pulley base and a second end connected to said combining base under said outer frame of said dust-collecting tank.