Gear pump and replaceable reservoir for a fluid sprayer

A gear pump/reservoir device for a fluid sprayer, comprising:

• a pump housing having a mounting surface for attachment to a hand held appliance and a recessed portion for receiving and sealing thereto a fluid reservoir, said pump housing also having a cavity for locating a drive motor and gears therein, said cavity having ribs therein forming pump passages including a pump inlet and a pump outlet said recessed portion having a projection therein, said projection having an orifice therethrough extending into said pump inlet;
• an electric motor having a motor housing and a rotating shaft extending therefrom, said motor housing connected to said pump housing via a resilient fluid sealing member located therebetween;
• a pinion gear mounted to said rotating shaft of said motor inside said cavity of said pump housing;
• an idler gear rotatably connected within said cavity to engage said pinion gear, said gears together with said pump passages in said cavity substantially limiting fluid flow between mating gear teeth of said gears and between said gears and said cavity, to form a gear pump, said pump outlet being in fluid communication with said gear pump;
• a fluid line leading from said pump outlet to a sprayer head, said fluid line having a discharge check valve located therein to minimize fluid dribbling at said sprayer head, said check valve having a cracking pressure;
• a fluid container mounted to said recessed portion of said pump housing to form a fluid reservoir, said container having an air vent valve to enable ambient air to replace fluid drawn from said reservoir and a fluid discharge valve, said fluid discharge valve being opened by engagement with said projection within said recessed portion to provide fluid communication to said pump inlet;
• and
• means for powering and operating said motor such that said gear pump provides a continuous flow of fluid to said sprayer head upon demand by a user.