Motorized pump pressurized liquid sprayer

In a sprayer apparatus for carrying on the back of a user, the combination comprising:

• a back-supporting panel configured for abutting relation with the back of the user and adapted to be in a generally vertical position in use;
• container means integrally formed with said panel and configured for receiving liquids to be dispensed;
• a pressure vessel generally centrally disposed within said container means and having a generally vertically extending bottom opening configured to form a coupling fitting;
• first liquid flow passage means communicating with said coupling fitting and the interior of said container means;
• a stand attached to said panel and having a base portion formed of bent tubing for supporting the apparatus on a surface when worn, the base portion including opposing side tubing portions and an interconnecting tubing portion, collectively disposed in a plane generally perpendicular to said panel;
• support plate means configured for detachably engaging the opposing side tubing portions of said base portion;
• means for clamping said support plate means to said interconnecting tubing portion;
• battery means and motor-operated pump means attached to said support plate means with the center of gravity thereof generally centrally located relative to said base portion, the pump of said motor-operated pump means having an inlet and an outlet;
• fitting means for attachment to said coupling fitting, said fitting means including liquid flow passages in communication with the liquid flow passage means of said container means;
• and
• hose means interconnecting the liquid flow passages of said fitting means with said inlet and outlet of said pump means.

A retrofit motorized pump package for a sprayer apparatus adapted to be carried on the back of a user, the sprayer apparatus comprising, a back support panel, container means integrally formed with the panel for receiving liquids to be dispensed, a pressure vessel centrally disposed within the container means and having a bottom opening forming a coupling fitting with liquid flow passage means, a manually operated pump assembly detachably secured to said coupling fitting, and a tubular stand attached to said panel and including a pair of opposing side tubing portions and an interconnecting tubing portion collectively disposed in a plane generally perpendicular to said panel, said retrofit package being adapted to replace said manually operated pump assembly and to be attached to and supported on said stand to thereby provide a motorized liquid sprayer having improved balance and weight distribution and enhanced stability both when carried on the back of a user and when supported by said stand, said retrofit package comprising:

• support plate means configured for detachably engaging the opposing side tubing portions of said base portion;
• means for clamping said support plate means to said interconnecting tubing portion;
• battery means and motor-operated pump means attached to said support plate means with the center of gravity thereof generally centrally located relative to said stand;
• fitting means adapted to be connected to and received within said coupling fitting and including liquid flow passages in communication with the liquid flow passages of said coupling fitting of said container means upon connection of said fitting means with said coupling fitting;
• and
• means interconnecting the fitting means and the pump means, whereby the sprayer apparatus may be changed from a manual apparatus to a motor driven apparatus by detaching the manual pump assembly from the coupling fitting of the pressure vessel, slidably engaging and connecting the support plate means to the side tubing portions of the stand, and securing the fitting means to the coupling fitting of the pressure vessel.