Patent ID: 8746585

Claim:
A power trigger sprayer for spraying a fluid having a viscosity of at least 20 centiStokes, said power trigger sprayer comprising: a shell for housing components for said sprayer; said shell adapted for coupling to a fluid source container; a pulsating pump capable of producing a pulsed flow at a varying flow rate for each pulse at a high pulse repetition rate, said high pulse repetition rate sufficient to maintain multiple pulses simultaneously in flight to develop a predetermined spray pattern; said pulsating pump having a first piston and a second piston and a drive motor configured to provide two non-overlapping pulses of said pulsed flow for each revolution of said drive motor; a swirl chamber nozzle configured for operation with said fluid, coupled to said pulsating pump through a coupling capable of delivering said pulsed flow without smoothing said pulsed flow; a tube coupled to said pulsating pump for picking up said fluid from said fluid source container; said fluid having a viscosity of at least 20 centiStokes; a rechargeable power source configured as a removable power source module contained, at least in part, within a cavity formed by said shell, said rechargeable power source having a battery portion that, when in use, is disposed entirely within said cavity formed by said shell; and a trigger for controlling power to said pulsating pump from said power source.