A fluid sprayer includes a pump and an electrostatic module configured to provide an electrostatic charge to spray fluid. The electrostatic module is electrically connected to a conductive component of the fluid sprayer, such as a fluid displacement member, fitting, cylinder, or spray tip, to charge the spray fluid via the conductive component. The fluid is electrostatically charged prior to exiting the fluid sprayer.

An apparatus for use in drywall plastering, and more specifically for applying a pumpable finishing compound to a surface, is disclosed. The apparatus comprises a receptacle for storing the pumpable compound, an applicator for applying the compound to a surface or feature to which the compound is to be applied, a pump for pumping the compound from the receptacle to the applicator for application to the surface or feature, an electric motor which drives the pump, a battery that powers the electric motor, and a conduit through which the compound is pumped from the receptacle to the applicator, and the receptacle, pump, motor and battery of the apparatus may be able to be worn by a user, or carried on a part of the user’s body, while the apparatus is in use for applying the compound to the surface or feature. The apparatus is self-contained and self-powered, and it can consequently operate in an “untethered” manner in the sense that it does not require any power cables extending from the apparatus to a remote power outlet or generator, and there is no need for any hoses or the like to deliver finishing compound, or compressed air, or anything like that, to the apparatus while it is in use.

A fluid dispensing device includes a housing and a reciprocating piston fluid pump coupled to the housing. The reciprocating piston fluid pump includes a piston. The piston is configured to pressurize at least one pumping chamber. A motor is connected to the reciprocating piston fluid pump to actuate the piston. A spray tip connected to an outlet of the at least one pumping chamber.

A fluid dispensing device includes a housing and a reciprocating piston fluid pump coupled to the housing. The reciprocating piston fluid pump includes a piston. The piston is configured to pressurize at least one pumping chamber. A motor is connected to the reciprocating piston fluid pump to actuate the piston. A spray tip connected to an outlet of the at least one pumping chamber.

A fluid dispensing device includes a housing and a reciprocating piston fluid pump coupled to the housing. The reciprocating piston fluid pump includes a piston. The piston is configured to pressurize at least one pumping chamber. A motor is connected to the reciprocating piston fluid pump to actuate the piston. A spray tip connected to an outlet of the at least one pumping chamber.

A fluid dispensing device includes a housing and a reciprocating piston fluid pump coupled to the housing. The reciprocating piston fluid pump includes a piston disposed within a cylinder. The piston is configured to pressurize at least one pumping chamber. A motor is coupled to the housing and connected to the reciprocating piston fluid pump to actuate the piston. A wobble assembly connects the motor to the piston of the reciprocating piston fluid pump. A spray tip connected to an outlet of the at least one pumping chamber.

A fluid dispensing device includes a housing and a reciprocating piston fluid pump coupled to the housing. The reciprocating piston fluid pump includes a piston disposed within a cylinder. The piston is configured to pressurize at least one pumping chamber. A motor is coupled to the housing and connected to the reciprocating piston fluid pump to actuate the piston. A wobble assembly connects the motor to the piston of the reciprocating piston fluid pump. A spray tip connected to an outlet of the at least one pumping chamber.

A fluid dispensing device includes a housing and a reciprocating piston fluid pump coupled to the housing. The reciprocating piston fluid pump includes a piston disposed within a cylinder. The piston is configured to pressurize at least one pumping chamber. A motor is coupled to the housing and connected to the reciprocating piston fluid pump to actuate the piston. A wobble assembly connects the motor to the piston of the reciprocating piston fluid pump. A spray tip connected to an outlet of the at least one pumping chamber.

In a dispenser for dispensing at least two liquid or pasty substances from receptacles to a dispenser head, constant delivery pumps are connected therebetween to compensate for viscosity variations and keep a given mixing ratio constant.

A portable motorized fluid sprayer device is described, having a fluid tank and a pump manifold configured to pump fluid from the tank and into a connected fluid conveying structure (e.g., a hose, wand, nozzle, handle and/or similar structures). The manifold may include an electric motor, a gear pump, a controller, and a battery. Additionally, the fluid sprayer device may allow for spraying fluid with consistent pressure, recirculation of fluid within the tank, a gear pump for spraying or suctioning fluid from the fluid conveying structure, a safety lever, the ability to separate the pump manifold from the fluid tank, and other features.